STAMPING TOOL LOCKING TECHNOLOGY
The invention provides a stamping tool retainer assembly comprising a retainer, a moveable lock body, and an automation actuator. The retainer has a tool-mount bore configured to receive a shank of a stamping tool. The moveable lock body has a locked position and an unlocked position. The stamping tool retainer assembly is configured such that the lock body moves from the unlocked position to the locked position in response to actuation of the automation actuator. The automation actuator is a pneumatic actuator, a hydraulic actuator, or an electric actuator.
The present disclosure relates generally to stamping tools and, more particularly, to lockable retainers for stamping tools.
BACKGROUNDStamping tools are used in a variety of workpiece processing applications, such as punching holes in, or forming, a piece of sheet metal in a progressive stamping operation. A stamping tool, such as a punch or die, acts on the workpiece to perform the desired processing. The stamping tool is held releasably by a retainer, which is typically secured to a die shoe of the stamping system. Thus, the retainer holds the stamping tool securely in its proper position.
In many cases, it is desirable to act on a workpiece at multiple locations, e.g., simultaneously, subsequently, or both. For example, it may be desirable to punch a number of different holes at different spots on a piece of sheet metal. To accomplish this, a number of retainers can be secured to the die shoe at different locations. The die shoe carrying the stamping tools is then moved toward the sheet metal to cause the individual tools carried by the retainers to simultaneously act on the sheet metal. As is well known, in some cases, a single retainer (i.e., a multiple position retainer) holds multiple stamping tools.
Retainers are configured to hold stamping tools in a removable manner. This enables periodic removal of stamping tools, which is required to allow for sharpening or replacing worn tools. It also makes it possible to exchange one stamping tool (e.g., of a first size or shape) for another stamping tool (e.g., of a different size or shape).
Removing a stamping tool from a conventional retainer requires an operator to manually unlock each tool from its retainer individually. For example, an operator must generally insert a hand-held instrument into each retainer to cause a locking device of the retainer to release the stamping tool. Once the operator has unlocked and removed this tool, the same process must be repeated for every other stamping tool to be removed. This manual process can be time consuming, especially where a large number of stamping tools must be removed. Moreover, the manual removal process is complicated by the fact that the operator may need to work in close proximity to (e.g., reach around) the sharp tips of various, densely located tools on a die shoe.
It would be desirable to provide a stamping tool retainer assembly that is adapted for automated (rather than manual) unlocking. Further, it would be desirable to provide a stamping tool retainer assembly adapted for automated unlocking (or a conventional stamping tool retainer) with a tool-shank detent that prevents a stamping tool received in a tool-mount bore of the unclamped assembly or retainer from falling from the assembly or retainer when the assembly or retainer is mounted above a workpiece position (i.e., such that the stamping tool hangs downwardly).
SUMMARYSome exemplary embodiments disclosed herein provide automated assemblies and systems for unlocking one or more stamping tools from one or more associated ball-lock retainer assemblies, which preferably are configured to be mounted on a die shoe of a stamping system. As a result, these particular embodiments eliminate the need for an operator to manually unlock one or more stamping tools from one or more ball-lock retainer assemblies. Embodiments of this nature provide a number of useful advantages, including increased efficiency and safety in conjunction with removing stamping tools for maintenance (e.g., sharpening), replacement, or other change-outs.
Various embodiments of the invention provide a ball-lock retainer assembly. The ball-lock retainer assembly includes a ball, a resilient biasing member, and an automation actuator. The ball has a locked position and an unlocked position. The ball-lock retainer assembly is configured such that the ball moves from its locked position to its unlocked position in response to actuation of the automation actuator. Thus, the actuator is operable to move the ball from its locked position to its unlocked position. The automation actuator is a hydraulic actuator, a pneumatic actuator, or an electric actuator.
Certain embodiments of the invention provide a stamping system. The stamping system includes a plurality of ball-lock retainer assemblies. In the present embodiments, each of the ball-lock retainer assemblies has a ball, a resilient biasing member, a piston, and an automation actuator. Each ball has a locked position and an unlocked position. Each piston is configured to move a respective ball from its locked position to its unlocked position in response to actuation of a respective automation actuator. Preferably, each automation actuator is a hydraulic actuator or a pneumatic actuator. The hydraulic or pneumatic actuator of each such ball-lock retainer assembly has a fluid intake port and a fluid manifold. These ball-lock retainer assemblies are connected (optionally in series) by one or more pressurized fluid lines.
Thus, in certain embodiments, a stamping system (e.g., a die shoe equipped with an assembly of retainers and stamping tools) is adapted to simultaneously or substantially simultaneously unlock a plurality of stamping tools, such as a series (optionally all) of the stamping tools of the stamping system. In some cases, the system is adapted to selectively unlock a desired subset of the stamping tools of the system.
Further, some embodiments of the invention provide a ball-lock retainer assembly that includes a retainer housing and an adapter housing. The retainer housing has an elongated primary tool-mount opening. The ball-lock retainer assembly has a ball, a resilient biasing member, and an elongated angled opening. The adapter housing has an elongated secondary tool-mount opening and is configured to be mounted on the retainer housing such that the elongated primary tool-mount opening and the elongated secondary tool-mount opening are aligned to collectively form a tool-mount bore.
One embodiment of the invention provides a ball-lock retainer assembly that includes a retainer housing and an adapter housing. In this embodiment, the retainer housing has a front face, an elongated primary tool-mount opening, and a release opening. The ball-lock retainer assembly includes a ball, a resilient biasing member, and an elongated angled opening. The elongated angled opening intersects, so as to open into, the elongated primary tool-mount opening. The release opening opens through the front face of the retainer housing and extends to the elongated angled opening. The ball and the resilient biasing member are received in the elongated angled opening. The ball has a locked position and an unlocked position. The resilient biasing member is positioned to resiliently bias the ball toward its locked position. When the ball is in its locked position, the ball projects into the elongated primary tool-mount opening. The adapter housing includes an elongated secondary tool-mount opening, a piston, and an automation actuator. The automation actuator is a hydraulic actuator or a pneumatic actuator. The adapter housing is mounted on the front face of the retainer housing such that the elongated primary tool-mount opening and the elongated secondary tool-mount opening are aligned to collectively form a tool-mount bore. The piston is configured to extend through the release opening of the retainer housing and into the elongated angled opening so as to move the ball from its locked position to its unlocked position in response to actuation of the automation actuator.
Further, the invention provides embodiments wherein a ball-lock retainer assembly includes a housing with an elongated tool-mount opening. The ball-lock retainer assembly has a ball and a resilient biasing member. The ball has a locked position and an unlocked position. In the present embodiments, the ball-lock retainer assembly can optionally be adapted for automated unlocking of the ball, or it can be any type of conventional ball-lock retainer (which does not have an automated ball-unlock system). The ball and the resilient biasing member are both received in an elongated angled opening of the ball-lock retainer assembly. The elongated angled opening intersects, so as to open into, the elongated tool-mount opening. The elongated tool-mount opening is configured to receive a shank of a stamping tool. In the present embodiments, the ball-lock retainer assembly (or “retainer”) further includes a tool-shank detent adjacent to the elongated tool-mount opening. In these embodiments, when a stamping tool is received in the elongated tool-mount opening, the assembly or retainer is in an unclamped configuration, and the assembly or retainer is mounted above a workpiece position (so the stamping tool hangs downwardly), the tool-shank detent prevents the stamping tool from falling from the assembly or retainer. However, the embrace of the tool-shank detent on the stamping tool is such that an operator can still freely pull the stamping tool from the unclamped assembly or retainer.
Some embodiments of the invention provide a stamping tool retainer assembly that includes a retainer, a moveable lock body, and an automation actuator. In these embodiments, the retainer has a tool-mount bore configured to receive a shank of a stamping tool. The moveable lock body has a locked position and an unlocked position. In the present embodiments, the stamping tool retainer assembly is configured such that the lock body moves from the unlocked position to the locked position in response to actuation of the automation actuator. The automation actuator being a pneumatic actuator, a hydraulic actuator, or an electric actuator.
Finally, in one group of embodiments, the invention provides a stamping tool retainer assembly that includes a retainer and a moveable lock body. In these embodiments, the retainer has a tool-mount bore configured to receive a shank of a stamping tool. The moveable lock body has a locked position and an unlocked position. In the present embodiments, the stamping tool retainer assembly further includes a tool-shank detent adjacent to the tool-mount bore.
The following detailed description is to be read with reference to the drawings, in which like elements in different drawings have been given like reference numerals. The drawings, which are not necessarily to scale, depict selected embodiments and are not intended to limit the scope of the invention.
The retainer housing 10 is configured to receive and securely hold a stamping tool 15. The retainer housing preferably is adapted to be coupled to (e.g., mounted on) a mounting plate, such as a die shoe of a stamping system. For mounting the retainer housing 10 onto a die shoe 700 (see
The stamping tool 15 can be, for example, a punch, die, or pilot. It is to be appreciated that any of a wide variety of known stamping tools can be used. With respect to stamping punches, the tip of the punch can have any desired shape, such as round, oval, square, triangular, U-shaped, C-shaped, X-shaped, multi-lobed, thread forms, etc. Advantageous stamping tools are available commercially from Wilson Tool International, of White Bear Lake, Minn., USA. Skilled artisans are quite familiar with the configuration and set-up of complimentary punches and dies, as well as the proper placement and machining of workpieces therebetween.
When the stamping tool 15 is retained securely (e.g., held operably) in the retainer housing 10, the stamping tool is adapted to perform (in the case of a punch or die) or facilitate (in the case of a pilot) a processing operation on a workpiece. The processing operation may be a punching or forming operation (which cuts, bends, or otherwise deforms the workpiece).
The workpiece will commonly be a piece of sheet metal, e.g., in the form of a coil or sheet. However, other sheet-like materials can also be used. For example, non-metallic sheets or coils of various non-metallic materials (such as plastic) may be used. In some cases, pre-shaped blanks of various materials may be used. If desired, the workpiece can be a film.
The retainer housing 10 is adapted to receive, and lockingly hold (or “clamp”), the stamping tool 15. The retainer housing 10 has an elongated primary tool-mount opening 30. The elongated primary tool-mount opening 30 is configured to receive a shank 55 of the stamping tool 15. Reference is made to
With reference to
In
To enable the stamping tool 15 to be locked in the retainer housing 10, the retainer housing is provided with a ball lock 40. One example is shown in
The resilient biasing member 50 will commonly be a spring. If desired, however, the resilient biasing member in any embodiment of the present disclosure can alternatively be provided by a magnet or pressurized fluid. The resilient biasing member 50 will typically be a compression spring, such as a helical compression spring. The spring will commonly be formed of spring steel. The size of the spring will commonly be the same as that of the ball 45. For example, if the ball has a diameter of ½ inch, the spring preferably is sized to fit within a ½ inch bore. The spring preferably is flared at its trailing end so as to facilitate wedging, and thereby retaining, the spring in the bottom of the elongated angled opening (or “retainer ball bore”) 35. Once the spring is mounted in the elongated angled opening 35, an optional backing plate 840 prevents the spring from coming out of that opening. Reference is made to
The ball 45 and the resilient biasing member 50 are received in (e.g., housed within) the elongated angled opening 35. In
The ball 45 is moveable between a locked position and an unlocked position. When in the locked position, the ball 45 projects into the elongated primary tool-mount opening 30. The resilient biasing member 50 is adapted to resiliently bias the ball 45 toward the locked position. When in the unlocked position, the ball 45 does not project into (or at least not as far into) the elongated primary tool-mount opening 30. Instead, the ball 45 when in the unlocked position preferably is disposed entirely (or at least substantially entirely) in the elongated angled opening 35.
Upon inserting the shank 55 of the stamping tool 15 into the elongated primary tool-mount opening 30, the shank bears against the ball, thus pushing the ball further into the elongated angled opening 35 (i.e., generally toward the rear face 25 of the retainer housing) while overcoming the bias of, and thereby compressing, the resilient biasing member 50. This moves the ball 45 to its unlocked position, where it no longer projects into (or at least not substantially into) the elongated primary tool-mount opening 30. While inserting the stamping tool 15 into the elongated primary tool-mount opening 30, due to the bias of the resilient biasing member 50, the ball 45 continues to bear against the shank 55 of the tool 15. Thus, as the tool 15 is moved further into the elongated primary tool-mount opening 30 and reaches its final, seated position, the ball 45 preferably encounters a recess 60 (e.g., a dimple, which may be generally teardrop shaped) in the shank 55 of the tool 15. At this point, the bias supplied by the resilient biasing member 50 moves the ball 45 to the locked position by urging the ball 45 into engagement with the recess 60 on the shank 55 of the tool 15. This represents the clamped position of the ball-lock retainer assembly. The stamping tool 15 can thus be fully inserted into the elongated primary tool-mount opening 30 (i.e., so as to bottom out therein). In its locked position, the ball 45 acts to hold the tool 15 securely in its operative position in the retainer housing 10. This is due to an interference fit between the ball 45, the shank 55 of the tool 15, the walls that define the elongated primary tool-mount opening 30, and the walls that define the elongated angled opening 35. The foregoing description also applies to other embodiments of the present disclosure. Thus, in the above description where reference is made to the elongated primary tool-mount opening 30, with respect to embodiments like those of
The stamping tool 15 can thus be held removably in the retainer housing 10. To remove the stamping tool 15 from the retainer housing 10, first, the ball 45 is moved from its locked position to its unlocked position. This represents the unclamped configuration of the ball-lock retainer assembly. In the embodiments illustrated, to move the ball 45 to its unlocked position, the bias of the resilient biasing member 50 must be overcome. By overcoming the bias of the resilient biasing member 50, the ball 45 can be moved from its locked position (in which the ball projects into the elongated primary tool-mount opening 30) to its unlocked position (in which the ball preferably is received entirely, or at least substantially entirely, within the elongated angled opening 35, so as not to project into the elongated primary tool-mount opening, or at least not significantly).
In the embodiment of
Preferably, the retainer housing 10 is in the form a first block, and the adapter housing 110 is in the form of a second block. While not required, it will commonly be the case that the first and second blocks have matching exterior side perimeter shapes. In such cases, when the adapter housing 110 is mounted to the retainer housing 10, the first and second blocks coincide about a perimeter to form a substantially continuous exterior profile shape along the entire height of the mounted (e.g., stacked) housings.
To facilitate mounting the adapter housing 110 on the retainer housing 10 removably, the adapter housing preferably has an elongated mount opening (e.g., bore) 135 that opens through the rear face 120 of the adapter housing. The mount opening 135 preferably also opens through the front face 115 of the adapter housing 110, such that it extends between the front and rear faces of the adapter housing. The illustrated mount opening 135 is defined by a non-threaded (e.g., smooth) bore, although it can alternatively be threaded along some or all of its length. The mount opening 135 is configured to receive a fastener (e.g., an externally threaded bolt) 140 so as to removably secure the adapter housing 110 to the retainer housing 10.
The illustrated fastener 140 attaches the adapter housing 110 to the retainer housing 10 by extending from the mount opening 135 in the adapter housing to a corresponding mount opening 145 in the retainer housing 10 (see
Thus, in the embodiment of
The ball-lock retainer assembly preferably has an automation actuator 500, which is operable to unclamp a stamping tool 15 held by the ball lock 40 (e.g., by moving the ball 45 from its locked position to its unlocked position). Thus, the ball-lock retainer assembly preferably is configured such that the ball moves from its locked position to its unlocked position in response to actuation of the automation actuator. The automation actuator 500 is a hydraulic actuator, a pneumatic actuator, or an electric actuator. As noted above, in some embodiments, the ball-lock retainer assembly comprises a piston 150. In such cases, the ball 45 and the piston 150 are operatively coupled such that when the piston is in a first position (e.g., a retracted position) the ball is in its locked position, and when the piston is in a second position (e.g., an extended position) the ball is in its unlocked position. Thus, when provided, the piston 150 is configured to move the ball 45 from its locked position to its unlocked position, e.g., in response to actuation of the automation actuator 500.
In the embodiment of
In some cases, the adapter housing has formed therein a piston opening 151 that opens through the rear face 120 of the adapter housing 110. In the embodiment of
The fluid manifold 165 is in fluid communication with the fluid intake port 155, which is configured to receive pressurized fluid from a source of hydraulic or pneumatic fluid. In some cases, pressurized fluid is conveyed through the fluid manifold 165 and out of the adapter housing 110 via an optional fluid output port 160 (see
It can thus be appreciated that the illustrated piston 150 is mounted within the adapter housing 110 for movement along a second longitudinal axis, which is spaced from (and can optionally be parallel to) the first longitudinal axis of the tool-mount bore 130. Moving the piston 150 to its extended position unlocks a stamping tool 15 mounted operatively in the tool-mount bore of the ball-lock retainer assembly.
A body or wall defining the engagement surface 190 of the piston 150 is configured (e.g., sized and shaped) to be inserted into and/or through the release opening 65. In the exemplary piston design shown in
When provided, the piston 150 is configured to move from its retracted position to its extended position so as to unclamp the stamping tool 15 from the ball-lock retainer assembly 105. As noted above, the retainer housing 10 includes a ball lock 40 having a ball 45 and a resilient biasing member 50. The piston 150 is configured to move the ball 45 from its locked position to its unlocked position in response to actuation of the automation actuator 500. When the piston 150 is in its retracted position, the resilient biasing member 50 holds the ball 45 in the locked position. When the piston 150 moves to its extended position, it pushes the ball 45 to the unlocked position, in the process overcoming the bias of the resilient biasing member 50.
In the embodiment of
The present embodiment is advantageous in that it is not necessary to rely (or at least not solely) on a resilient biasing member to return the piston 150 to its retracted position. Instead, fluid can be delivered to the second manifold 167 at a pressure sufficient to move the piston 150 back to its retracted position. This way, even if the piston 150 were to somehow get cocked or otherwise stuck in an extended position, the second manifold 167 can be flooded with pressurized fluid so as to force the piston back to its retracted position.
In more detail, in the present embodiment, in response to delivering pressurized fluid into the first fluid manifold 165 at a pressure that provides a force on the first side (e.g., face 180) of the piston 150 that is greater than the total, oppositely-directed force on the second side (e.g., face 185) of the piston (such total force may include both force from the resilient biasing member 15 and force from fluid in the second manifold 167), the piston moves in a first direction (e.g., toward the retainer housing 10). This movement of the piston 150 causes its engagement surface 190 to bear against the ball 45, thereby moving the ball further into the elongated angled opening 35 (in the process, overcoming the bias of the resilient biasing member). The ball 45 is thus moved from its locked position to its unlocked position.
When it is subsequently desired to move the ball 45 back to its locked position, pressure in the first fluid manifold 165 is reduced, such that the total force on the second side (e.g., face 185) of the piston exceeds the oppositely-directed force on the first side (e.g., face 180) of the piston. This will normally result in the resilient biasing member 50 pushing the ball 45 back to its locked position. When this happens, the ball 45 bears against the piston 150 so as to move it back to its retracted position.
As noted above, the second manifold 167 can serve as a means for dealing with the piston 150 inadvertently becoming cocked or otherwise stuck in an extended position. Thus, when it is desired to move the piston 150 to its retracted position, the second manifold 167 can optionally be flooded with pressurized fluid so as to force the piston back to its retracted position. In more detail, in response to delivering pressurized fluid into the second fluid manifold 167 at a pressure that results in the total force on the second side (e.g., face 185) of the piston 150 that is greater than the force placed on the first side (e.g., face 180) by fluid in the first manifold 165, the piston moves in a second direction (e.g., away the retainer housing 10). This movement of the piston 150 back to its retracted position allows the ball 45 to be moved back to its locked position by the bias of the resilient biasing member 50.
In
As with embodiment of
An adapter housing of the nature described above with reference to
In embodiments involving a retainer housing 10 with a removable ball-lock insert 825, the ball-lock assembly 105 comprises an adapter housing 110 mounted on the retainer housing 10, and the adapter housing preferably is equipped with a piston 150 that extends into a release opening 65 (e.g., defined by the insert 825) so as to contact (or at least be engageable with) the ball 45 in the elongated angled interior opening 35 (which may also be defined by the insert 825). The assembly and interaction (including the structure, functionality, different positions and configurations, etc.) of the adapter housing 110, the piston 150, the elongated angled interior opening 35, the ball-lock 40 (including the ball 45 and the resilient biasing member 50), the stamping tool 15, the tool-mount bore or opening(s), etc. preferably are of the nature described above. The details of the preferred ball-lock insert 825, and the manner in which it can be mounted removably in the retainer housing 10, are described in the above-noted '635 patent. However, the ball-lock insert in the present embodiments can alternatively be of any other known ball-lock insert type.
In
As noted above, some embodiments involve the automation actuator 500 being a hydraulic or pneumatic actuator. In other embodiments, however, the automation actuator 500 is an electric actuator. In such embodiments, the electric actuator is configured to provide a force that moves the ball 45 from its locked position to its unlocked position. Preferably, the electric actuator comprises a motor, e.g., an AC motor or a DC motor. Thus, the invention provides embodiments wherein the ball-lock retainer assembly includes a motor. When provided, the electric actuator may comprise a linear actuator or a solenoid. In some cases, it comprises an electronic solenoid. Thus, the automated unclamping of a stamping tool from the ball-lock retainer assembly can optionally be initiated by an electric actuator, which when provided preferably comprises a motor.
The ball-lock retainer assembly of any embodiment of the present disclosure can optionally include a clamp/unclamp indicator. When provided, the clamp/unclamp indicator allows an operator to visually inspect the ball-lock retainer assembly to assess whether it may be in a clamped (or “locked”) or unclamped (or “unlocked”) state. In the non-limiting example of
Thus, the indicator 305 preferably has first and second states, which provide visually-perceptible indications as to whether an associated ball-lock retainer assembly is in a clamped or unclamped configuration and/or whether a piston 150 thereof is in a retracted or extended position. When the ball-lock retainer assembly is in its clamped configuration, a stamping tool received therein is locked in an operative position. When the ball-lock retainer assembly is in its unclamped configuration, a stamping tool received therein is unlocked, and thus can be readily removed.
In some cases, the indicator 305 will be in its first state when the ball-lock retainer assembly is in the unclamped configuration.
With continued reference to the embodiment of
While the embodiment shown in
Further, the housing shown in
As will now be appreciated, the invention provides certain embodiments that involve an adapter housing 110 mounted to a retainer housing 10. These embodiments may be advantageous when an existing stamping system is to be retrofitted so as to benefit from the automated tool unclamping functionality provided by the present invention. However, in other embodiments, the automation actuator is incorporated into a retainer housing, as will now be described.
One such embodiment of a ball-lock retainer assembly 250 is shown in
In
In the present embodiment, the retainer housing 10 also has (e.g., a block 252 thereof defines) an elongated angled opening 35, which extends at an angle (e.g., an acute angle) relative to the first longitudinal axis of the tool-mount bore 265. The elongated angled opening 35 intersects, so as to open into, the tool-mount bore 265. Thus, the elongated angled opening 35 intersects the tool-mount bore 265 at an intersection location. As with the embodiments described above, ball-lock retainer assembly 250 includes a ball lock 40, which comprises a ball 45 and a resilient biasing member 50. The ball 45 and the resilient biasing member 50 are both disposed in the elongated angled opening 35. In the embodiment of
In
Ball-lock retainer assembly 250 enables automated unlocking of the stamping tool 15. In
The automation actuator 500 is a hydraulic actuator, a pneumatic actuator, or an electric actuator. In
When the piston 150 is in its retracted position, the resilient biasing member 50 retains the ball 45 in the locked position (see
As shown in
In the embodiment of
As noted above, actuation of the automation actuator 500 can causes the piston 150 to move from its retracted position to its extended position. In more detail, when the automation actuator 500 is actuated, fluid from the fluid intake port 280 enters the fluid manifold 282 and forces the piston 150 to move to its extended position. The engagement surface 190 of the piston 150 bears against (e.g., cams with) the ball 45 so as to overcome the bias of the resilient biasing member 50. This causes the ball 45 to move from its locked position (in which the ball projects into the tool-mount bore 265) to its unlocked position (in which the ball is housed at least substantially entirely within elongated angled opening 35). Thus, when the piston 150 is in its extended position, the piston bears against the ball 45 so as to keep the ball in the unlocked position.
A plurality of ball-lock retainer assemblies 250 can be connected (optionally in series) by actuation lines to form a stamping system. In such a system, the fluid intake ports 280 of the ball-lock retainer assemblies 250 can be in communication with pressurized fluid lines configured to deliver pressurized fluid (e.g., hydraulic fluid or air) to all the ball-lock retainer assemblies 250.
In any embodiment of the present disclosure, the ball-lock retainer assembly can optionally include a tool-shank detent. When provided, the tool-shank detent 31 is positioned to bear against the shank 55 of the stamping tool 15 when the tool is positioned in a tool-mount bore of the ball-lock retainer assembly. The tool-shank detent 31 can be a resilient body positioned to contact the shank 55 of the stamping tool 15 when the tool is received in a tool-mount bore of the ball-lock retainer assembly. In the embodiments of
Thus, the invention provides different embodiments that enable automated unlocking of a stamping tool from an associated ball-lock retainer assembly. This obviates the need for operators to interface with each retainer individually by manually unlocking each associated tool using a hand-held unlocking tool. Instead, an operator can unlock a stamping tool (or a plurality of stamping tools) by simply initiating an automated unlocking operation.
In the embodiment of
The cable 950 can be a monofilament line (e.g., a wire), a cord comprising multiple strands, or any other line of appropriate strength, diameter, and length. In some cases, the cable 950 is formed of metal. It can optionally be a single-strand wire or a stranded wire, such as a braided wire. The cable preferably has minimal stretch, is flexible enough to freely bend 90 degrees, and does not break or fray after continued use. If desired, the cable can be formed of ultra-high-molecular-weight polyethylene. The cable 950 can optionally have a diameter of between 0.030 and 0.060 inch.
If desired, the cable 950 can be configured to roll on bearings (rather than simply sliding along a groove, as illustrated). Such bearings may reduce the wear of the cable.
In the embodiment of
In
In
To provide automated unlocking of a plurality of stamping tools 15 (e.g., at substantially the same time), the stamping system 100 of
In
With continued reference to
Thus, pressurized fluid can be delivered to the ball-lock retainer assemblies 105 through the pressurized fluid lines 205. As such, upon actuation of the controller 210, pressurized fluid is delivered through the pressurized fluid lines 205 to each of the ball-lock retainer assemblies 105. This causes the automation actuator 500 of each ball-lock retainer assembly 105 to move each piston 105 to the extended position and thereby unlock the associated ball 45, which unclamps the associated stamping tool 15. As a result, each of the stamping tools 15 can be unclamped at substantially the same time.
In some embodiments, the stamping system includes two or more subsets of ball-lock retainer assemblies connected in series. In embodiments of this nature, the stamping tools associated with a first subset of ball-lock retainer assemblies connected in series can be unclamped at a first time, and the stamping tools associated with a second subset of ball-lock retainer assemblies connected in series can be unclamped at a second, different time. In other embodiments, two more ball-lock retainer assemblies are connected in parallel. As still another possibility, one group of ball-lock retainer assemblies are connected in series, while another group of ball-lock retainer assemblies are connected in parallel.
In one group of embodiments, the invention provides a stamping tool retainer assembly comprising a retainer, a moveable lock body, and an automation actuator. In the present embodiments, the retainer can comprise a single retainer housing 10, as shown in
In some embodiments of the present group, the moveable lock body 445 is a ball 45. However, this is not the case in all embodiments. For example, the moveable lock body 445 can alternatively comprise a pendulum or another pivot body (see
The retainer preferably has generally parallel, opposed front and rear faces. In the embodiments of
The retainer preferably has one or more (e.g., a plurality of) mount openings 600 configured to receive a respective plurality of mounting bolts 650 for bolting the retainer onto a die shoe or other mounting plate 700. Preferably, the retainer further includes one or more (e.g., a plurality of) dowel openings 145, 146 configured to receive a respective plurality of locating dowels 660 to facilitate mounting the retainer onto the die shoe or other mounting plate 700. In some cases, the tool-mount bore, the mount openings 600, and the dowel openings 660 all extend along longitudinal axes that are substantially parallel to each other. This, however, is not strictly required. Moreover, as noted above, it is possible to use many other fastening assemblies, which may or may not involve mounting bolts 650, dowels 660, or both.
In some cases, the retainer has a major dimension of less than six inches and a height of less than four inches. In the embodiments of
The tool-mount bore preferably has a blind bottom end. In some cases, a backing plate 840 (e.g., attached removably to a rear face 25 of a retainer housing block) defines the blind bottom end of the tool-mount bore.
In some embodiments of present group, the lock body 445 when in its locked position is spaced apart from any spring-based (e.g., spring-driven) resilient biasing member (e.g., spring 450 in
In some cases, the present stamping tool retainer assembly has an intermediate opening 407 located between the tool-mount bore and the automation actuator 500. Reference is made to the embodiments of
In certain embodiments of the present group, the automation actuator 500 is a pneumatic actuator or a hydraulic actuator comprising a piston 150. The embodiment of
In the embodiment of
The piston 150 in the embodiment of
In other embodiments, the automation actuator 500 is a pneumatic or hydraulic actuator comprising a bladder 475. Reference is made to the embodiment of
In still other embodiments, the automation actuator 500 is an electric actuator comprising an electric motor 1000. The embodiments of
In the embodiment of
With continued reference to the embodiment of
In the embodiment of
In
In
Turning now to the embodiment of
In
In
In any embodiment of the present disclosure, the die shoe or other mounting plate 700 preferably is adapted to move the stamping tool retainer assembly (and the stamping tool(s) held thereby) in a linear motion, e.g., a linear back-and-forth motion, such as an up-and-down motion, preferably without rotating the stamping tool retainer assembly or the stamping tool(s) it holds. This is conventional, and will be well understood by those having ordinary skill in this technology field.
The invention provides certain embodiments involving a stamping tool retainer assembly that is equipped with a tool-shank detent 31. Reference is made to the non-limiting examples of
In these embodiments, the stamping tool retainer assembly comprises a retainer and a moveable lock body 445. The retainer can be of any type described above with respect to any one or more of the figures. Alternatively, the housing in the present embodiments can be any type of conventional ball-lock retainer housing. Given the present teaching, skilled artisans will appreciate that the tool-shank detent can be provided advantageously on any stamping tool retainer assembly of any type. The retainer has a tool-mount bore configured to receive a shank 55 of a stamping tool 15. The moveable lock body 445 has a locked position and an unlocked position. In the present embodiments, the stamping tool retainer assembly further comprises a tool-shank detent 31 adjacent to the tool-mount bore.
The tool-shank detent 31 is positioned to engage the shank 55 of a stamping tool 15 when such a shank is received in the tool-mount bore. In some cases, the tool-shank detent 31 entirely surrounds the tool-mount bore. The tool-shank detent, for example, can comprise (e.g., be) an O-ring. As another possibility, the tool-shank detent 31 can be a lip seal (e.g., comprising a flexible lip against which the shank a stamping tool slides when inserted into or removed from the tool-mount bore). In some cases, the tool-shank detent 31 comprises a removable piece of cloth, string, or fiber that creates sufficient friction with the shank of the tool. In some cases, one or more ball plungers are used. In addition to the noted tool-retention functionality, the tool-shank detent 31 in some cases helps keep dirt out of the tool-mount bore, and/or provides some cleaning of the shaft 55 before it is fully inserted into the tool-mount bore.
While preferred embodiments of the present invention have been described, it should be understood that a variety of changes, adaptations, and modifications can be made therein without departing from the spirit of the invention and the scope of the appended claims.
Claims
1. A stamping tool retainer assembly comprising a retainer, a moveable lock body, and an automation actuator, the retainer having a tool-mount bore configured to receive a shank of a stamping tool, the moveable lock body having a locked position and an unlocked position, the stamping tool retainer assembly configured such that the lock body moves from the unlocked position to the locked position in response to actuation of the automation actuator, the automation actuator being a pneumatic actuator, a hydraulic actuator, or an electric actuator.
2. The stamping tool retainer assembly of claim 1 wherein the retainer is a block having generally parallel, opposed front and rear faces, the tool-mount bore is defined by the retainer and opens through the front face of the retainer.
3. The stamping tool retainer assembly of claim 2 wherein the tool-mount bore is a circular bore configured to snugly receive a cylindrical shank of a stamping tool.
4. The stamping tool retainer assembly of claim 2 wherein the retainer has a plurality of mount openings configured to receive a respective plurality of mounting bolts for bolting the retainer onto a die shoe, the retainer further including a plurality of dowel openings configured to receive a respective plurality of locating dowels to facilitate mounting the retainer onto the die shoe.
5. The stamping tool retainer assembly of claim 4 wherein the tool-mount bore, the mount openings, and the dowel openings all extend along longitudinal axes that are substantially parallel to each other.
6. The stamping tool retainer assembly of claim 2 wherein the retainer has a major dimension of less than six inches and a height of less than four inches.
7. The stamping tool retainer assembly of claim 1 wherein the lock body when in its locked position is spaced apart from any spring-based resilient biasing member of the stamping tool retainer assembly.
8. The stamping tool retainer assembly of claim 1 wherein the automation actuator is a pneumatic actuator or a hydraulic actuator comprising a piston, the stamping tool retainer assembly configured such that the piston moves from a first position to a second position in response to actuation of the automation actuator and the lock body is thereby pushed by the piston from the unlocked position to the locked position.
9. The stamping tool retainer assembly of claim 1 wherein the automation actuator is a pneumatic actuator or a hydraulic actuator comprising a bladder, the stamping tool retainer assembly configured such that the bladder expands in response to actuation of the automation actuator and the lock body is thereby pushed by the bladder from the unlocked position to the locked position.
10. The stamping tool retainer assembly of claim 1 wherein the automation actuator is an electric actuator comprising an electric motor, the stamping tool retainer assembly configured such that the lock body moves from the unlocked position to the locked position in response to operation of the electric motor.
11. The stamping tool retainer assembly of claim 1 wherein the automation actuator is an electric actuator comprising an electric motor and a cam body, the stamping tool retainer assembly configured such that the electric motor moves the cam body in response to actuation of the automation actuator and the cam body thereby cams with the lock body so as to move the lock body from the unlocked position to the locked position.
12. The stamping tool retainer assembly of claim 1 wherein the automation actuator comprises a guide body having a spiral track, the stamping tool retainer assembly configured such that the lock body moves along the spiral track of the guide body in response to actuation of the automation actuator such that the lock body thereby moves from the unlocked position to the locked position, and wherein the lock body is a ball.
13. The stamping tool retainer assembly of claim 3 wherein the cylindrical shank of the stamping tool is received in the circular tool-mount bore, the cylindrical shank of the stamping tool having formed therein a lock recess, the moveable lock body being in the locked position so as to project into the tool-mount bore and engage the lock recess.
14. The stamping tool retainer assembly of claim 1 wherein the stamping tool retainer assembly is mounted to a die shoe of a stamping press.
15. The stamping tool retainer assembly of claim 1 wherein the retainer has an intermediate opening in which the lock body is movably mounted, the intermediate opening being located between the tool-mount bore and the automation actuator.
16. A stamping tool retainer assembly comprising a retainer and a moveable lock body, the retainer having a tool-mount bore configured to receive a shank of a stamping tool, the moveable lock body having a locked position and an unlocked position, the stamping tool retainer assembly further comprising a tool-shank detent adjacent to the tool-mount bore.
17. The stamping tool retainer of claim 16 wherein the tool-shank detent is positioned to engage the shank of the stamping tool when such shank is received in the tool-mount bore.
18. The stamping tool retainer of claim 16 wherein the tool-shank detent is configured to retain the shank of the stamping tool in the tool-mount bore when such shank is received in the elongated tool-mount opening and the lock body is in its unlocked position.
19. The stamping tool retainer of claim 16 wherein the tool-shank detent entirely surrounds the tool-mount bore.
20. The stamping tool retainer of claim 16 wherein the tool-shank detent comprises an O-ring.
Type: Application
Filed: Sep 30, 2016
Publication Date: Apr 5, 2018
Inventors: Bryan L. Rogers (Forest Lake, MN), Thomas Steven Duppong (Woodbury, MN), Brian J. Lee (Elk River, MN)
Application Number: 15/281,613