Abstract: A processing machine has a main spindle apparatus and a tool holder which clamps a working tool. The main spindle apparatus detachably supports the tool holder and rotates. Oil mist is transported to the working tool through a lubricant supplying pipe in the main spindle apparatus. A coolant hose is formed in the tool holder. A supporting member is composed mainly of a sleeve and a draw bar. The supporting member air-tightly supports the coolant hose of the tool holder. A ring-shaped packing is placed between the lubricant supplying pipe and the supporting member in order to prevent any leakage of the oil mist. The periphery of the packing has two divided sub-parts of a character “Y” shape. The leaking oil mist expands one sub-part of the packing to air-tightly seal the gap formed between the lubricant supplying pipe and the draw bar.

Abstract: A device for the high-speed drilling of boards for printed circuits and the like comprising a support (2), a drill head (11) with associated mandrel (12), and a device for locking and driving a bit (13) in the mandrel, wherein the mandrel is actuated by a compressed air turbine (33) and comprises means (40) for encoding the speed of rotation of the turbine adapted to generate a signal representing this speed, this signal being supplied to a control circuit (61) in order to drive a proportional valve (62) disposed in the circuit supplying compressed air to the turbine as a function of the speed of rotation encoded by the encoder means (40).

Abstract: A water feed apparatus (20) of the present invention includes a water storage tank (40) that stores water for feeding, a pump unit (50) that feeds gas with a pressure to the water storage tank (40), and an adapter (30) that couples between the water storage tank (40) and a core drill (1). The pump unit (50) has a gripper portion (5) whose internal space is enlargingly and reducingly deformable by a gripping operation by an operator to feed the gas to the water storage tank (40). The adapter (30) has a drill-mounting portion (31b) for mounting on the core drill (1), a tank mounting portion (34) where the water storage tank (40) is mounted, a water passage (37) that connects between the drill-mounting portion (31b) and the tank mounting portion (34), and a valve unit (33) that opens and closes the water passage (37).

Abstract: The invention relates to a machine tool, particularly a machine reamer, comprising a shaft-type base and a replaceable cutter head which frontally protrudes from the base. An axially protruding extension of said cutter head engages into a frontal receptacle that is fixed to the base, the cutter head being removably clamped in said receptacle by means of a clamping screw which penetrates the replaceable cutter head in a truly axial direction. The screw head of the clamping screw rests against a face of the replaceable cutter head. The extension of the replaceable cutter head is provided with a polygonal part which is complementary to a truly axial polygonal hole that is fixed to the base and is penetrated by the polygonal part.

Abstract: An auxiliary device for a drill includes a base having a first side provided with a gathering portion, a fixing post mounted on a second side of the base and provided with a limit hole connected to the gathering portion, a water inlet port mounted on the second side of the base and provided with a water inlet hole connected to the gathering portion, and a water outlet port mounted on the second side of the base and provided with a water outlet hole connected to the gathering portion. Thus, the cooling water flows through the water inlet hole of the water inlet port into the gathering portion of the base to surround the drill bit so as to provide a cooling effect to the drill bit and the workpiece during the drilling process.

Abstract: A collet chuck for retaining a thread cutting tool with a sleeve is axially movable in the interior and has a mechanism for retaining the thread cutting tool. To shorten the tool changing times it is provided that the mechanism for retaining the tool is an axially movable quick-change sleeve guided in the collet chuck or in the sleeve, which quick-change sleeve is developed such that it is stayed via a spring, axially with respect to the sleeve and a clamping body for clamping a tool is provided.

Abstract: An operational group for etching and/or cutting articles, in particular panels, has a tool (1), driven into rotation by a mandrel (2) for cutting and/or etching the articles (3). Suction means (4) remove by suction fine and powdery wastes produced by the cutting and/or etching operations.

Abstract: A rotary cutting machine 10, if inclined at large angles, provides positive supply of a cutting oil and avoids leakage of the cutting oil. The machine 10 has a machine body 14 and an arbor 18. An oil tank 50 is mountable to the machine body 14 so that the oil tank 50 is oriented at a given angular position about the central axis of the arbor 18. The tank body 54 has an interior space. The interior space is divided into a first interior part and a second interior part by an imaginary plane containing the central axis of rotation of the arbor. The first interior part is less in volume than the second interior part.

Abstract: The invention relates to a tool adapter which can be fixed to tool machines in a detachable and interchangeable manner, the tool machines being drilling and milling or similar cutting tool machines comprising at least one rotating work spindle. The tool machines are used to receive and position cutting tools, whereby the tool adapter (1) which is made of a spherical section (4) and a cylindrical band (3) is secured to a tool receiving element (2) and the tool receiving element (2) comprises, preferably, a central bore (5) for supplying a coolant. Opposite lying traversal bores (8, 9) which are used to receive clamping bolts (10, 11) are provided in the tool adapter (1) in a tool-sided cylindrical band (3) which is adjacent to the spherical section (4) the band being, preferably, diametrical and comprising a planar system arranged on a tool-sided receiving area and pointing to the tool receiving element (2).

Abstract: The apparatus for supplying a cooling fluid to the outer surface of a tool consists of a guide element which surrounds the tool shank and gives rise to a laminar coolant flow.

Abstract: The invention relates to a multi-bladed deep drilling tool (17) comprising a cooling lubricant channel (19, 20) provided for each chip space (74) allocated to each cutter (71). Said channels (19,20) are supplied with a lubricant independently from each other, by means of either jointly drives or separately drives lubricating pumps (25, 26). Said channels being associated with either the drilling devise (11) or integrated into an adapter (30) which is pivoted with a common flow of lubricant, but which supplies independent individual flows. Lubrication of the individual cutting zones is guaranteed even if the chip removal channel is blocked, by chips for example. The pressure of the cooling lubricant channel increases in said area whereupon the channel in question is cleared.

Abstract: A cutting tool insert includes: a body defining a rake face, a flank face, and a cutting edge at an intersection of the rake and flank faces; and a cooling microduct within the body. A portion of the microduct extends along the cutting edge not more than 0.5 millimeter from the rake face, and not more than 0.5 millimeter from the flank face. The microduct has a cross-sectional area of not more than 1.0 square millimeter. The microduct is adapted to permit the flow of a coolant therethrough to transfer heat away from the cutting edge and extend the useful life of the insert. Secondary conduits having cross-sectional area no larger than 0.004 square millimeter may communicate between the microduct and the rake and/or flank face to exhaust coolant behind the cutting edge and further enhance cooling.

Abstract: A coolant fluid supplying tool post is mounted to a machining system for machine controlled movement and has an internal coolant passage system, a coolant fluid inlet, a coolant fluid outlet and a first dove-tail mount. A multiple machine tool support block has a second dove-tail mount is in supported engagement with the first dove-tail mount. A plurality of machine tool receptacles are defined in the multiple machine tool support block and each is adapted for support of a machine tool therein. Tool retainer members are carried by the multiple machine tool support block for each of the machine tool receptacles and has retaining engagement with a machine tool located within a machine tool receptacle. Coolant passages within the multiple machine tool support block have a coolant supply inlet in fluid communication with the coolant fluid outlet of the coolant fluid supplying tool post.

Abstract: The aim of the invention is to improve the guiding of a lubricant through a tool holder in a small quantity lubrication system. According to the invention, a tool holder (1) comprises, in the maintaining body thereof (3), an axially displaceable stop sleeve (45) which is mounted in a through opening (31) which is connected to the receiving opening (13) for a tool shaft (15) and a stop surface (47) which is adjacent to the front end (23) of the tool shaft (15). Said stop sleeve (45) is screwed into an inner thread (43) of the through opening (31) and is coupled in a rotationally fixed manner, but in an axially displaceable manner, to a control tube (49) which engages in said stop sleeve (45) in an axial manner. Said control tube (49) is mounted in an axially fixed manner to the side thereof, but in a rotatable manner to the fluid coupling (27). A lubricant can be guided over the blades of the tool (9) by means of the fluid coupling (27), the control tube (49), the stop sleeve (45) and channels (17).

Abstract: A rotary cutting tool comprising a solid cutting head mounted to a shank. The cutting head comprises a cutting portion adjacent a cutting head front face and a mounting portion integrally formed therewith and extending rearwardly therefrom. The shank comprises a receiving portion extending rearwardly from a shank front face. When the cutting head is secured to the shank, the mounting portion is received in the receiving portion, and the shank front face is forwardly exposed and adjacent the cutting head front face.

Abstract: The invention relates to a machine tool for introducing bores into a workpiece, said machine tool comprising a machine frame, a drilling tool holder which is arranged on the machine frame and has at least one tool spindle, and a workpiece carrier which is arranged on the machine frame, the boring tool holder and the workpiece carrier being displaceable in relation to each other in a direction of displacement. A longitudinal direction of the at least one tool spindle is oriented transversally in relation to a horizontal plane, and the drilling tool holder is arranged on the machine frame in such a way that it can be pivoted in relation to the workpiece carrier, so that inclined bores can be introduced into the workpiece.

Abstract: A tool holder is provided that is configured to deliver coolant to a work piece and/or a cutting tool. The tool holder includes a tool mounting aperture for receiving a shank of a cutting tool, and an axially extending central passage for receiving coolant deliver though a spindle of a machine tool. The tool holder additionally includes several coolant passages located around the tool mounting aperture for conveying the coolant from the central passage and distributing the coolant to the work piece and cutting tool. The coolant passages extend substantially parallel to the tool mounting aperture and are slightly radially spaced from the tool mounting aperture.

Abstract: A portable drilling machine includes a housing; a drill chuck positioned on a front surface of the housing; a drill bit detachably coupled to the drill chuck; a driver positioned inside the housing to provide either the drill bit or the drill chuck with a rotational driving force; an anti-dust cover having a rear anti-dust cover formed in a cup shape with a drill through-hole formed in a central region of a bottom surface of the rear anti-dust cover and a front anti-dust cover formed in a tube shape to be coupled to the rear anti-dust cover, the front anti-dust cover being adapted to move towards the bottom surface of the rear anti-dust cover when acted on by pressure towards the housing and return to original position when the pressure is removed; and a retainer for detachably coupling the rear anti-dust cover to an outer surface of either the housing or the drill chuck. The rotational motion of the drill bit is not interfered with by the anti-dust cover, and the dust collection space is increased.

Abstract: A shaft tool with a machining section and a cylindrical shaft which comprises at least one internal coolant/lubricant duct which on its end facing away from the machining section comprises at least one orifice, wherein the shaft forms a conical fitting surface that encloses the orifice. A device comprising a shaft tool and a connection piece, the connection piece comprising a centric coolant/lubricant supply duct which exits in an apex region of an inner cone which accommodates in a positive-locking manner the conical fitting surface of the shaft tool, the conical fitting surface facing the inner cone.

Abstract: Machining coolant/lubricant is used to operate a piston of a clamping-side coupler by feeding same via a coolant feed passage to a clamping pressure chamber through a first check valve and a clamping pressure fluid passage. The same coolant/lubricant is discharged from an unclamping pressure chamber through an unclamping pressure fluid passage and a second check valve. The resulting movement of the piston downwards brings a clamp member into contact with a workpiece to thereby clamp the workpiece on a table. Thus, a dedicated pressure source for clamping can be dispensed with.

Abstract: A machine tool includes a base having a spindle rotatably attached to a support for supporting a tool member, and a fluid supplying device for supplying fluid into the spindle, for cooling purposes. The fluid supplying device includes a housing secured to the support for rotatably receiving the spindle, a casing is secured to the housing and has a channel for communicating with the conduit of the housing, and a membrane is secured between the housing and the casing and disposed between the bore of the housing and a space of the casing for pumping the fluid from the space to the channel of the casing. A check valve is disposed in the casing and has a spring member for biasing a ball to selectively block or open a passage of the casing.

Abstract: A method for using a drilling device with a rotating tool, a drilling machine and lubrication device. The device includes an intermediate chamber for storage of chips produced during an elementary drilling operation, and a scavenging device capable of generating an airflow scavenging the chips. The elementary drilling operation is performed without activating the scavenging device, and the elementary drilling operation is followed by an airflow scavenging operation of the chips stored in the intermediate storage chamber during the elementary drilling operation.

Abstract: A multi-shaft spindle head, wherein a plurality of spindles (11) having tools at the tips thereof are disposed in the same direction, the rear ends of cutting fluid feed passages (21a) formed as the inner holes of cutting fluid feed tubes (21) installed in a non-rotating state at the rotating center parts of the spindles (11) are allowed to communicate with a common closed chamber (8) formed at the rear parts of the spindles (11), and atomized cutting fluid fed into the common closed chamber (8) is jetted from the tips of the openings at the rear end of the cutting fluid feed passages (21a).

Abstract: The invention relates to a clamping chuck for a tool comprising a device for supplying a cooling agent and/or lubricants to a feeding channel of the tool maintained by the clamping chuck. The clamping chuck comprises a sleeve for coupling a feed pipe for supplying a cooling agent and/or lubricants, the sleeve provided with a tubular element and an adjusting screw which is arranged in such a way that it is displaceable with respect to the clamping chuck in the direction of the longitudinal axis thereof.

Abstract: A drill has a unitary drill bit and chuck structure that includes a drill bit and a chuck. The chuck encloses a portion of the drill bit and has a thread. A rotatable drive element having a thread engages the thread of the chuck. The chuck is heat shrunk onto the drill bit to form a unitary structure through direct bonding of the chuck with the drill bit.

Abstract: A tool head for securing a tool in a machine tool has a stationary spindle bearing housing, a spindle rotatably supported in the spindle bearing housing, and a modular tool changing insert for receiving a tool. The tool changing insert is exchangeably arranged on the spindle or a holder. An internal cooling medium supply device supplies a cooling medium directly from the spindle bearing housing into the tool changing insert. The cooling medium supply device preferably supplies the cooling medium laterally into the tool changing insert via an auxiliary housing.

Abstract: In a valve disposed between a fluid supply and a socket of a chuck and configured to regulate the flow of the fluid to the socket. There is a seal screw for modulating a preload tension. This seal screw has a first sealing surface. The valve further includes a second sealing surface in opposing relation to the first sealing surface and an elastomer seal ring disposed between the first sealing surface and the second sealing surface. The valve is configured to form a seal between the first sealing surface, the second sealing surface, and the elastomer seal in response to a force less than or equal to the preload tension being exerted in line with the seal screw. In this manner, the valve is configured to allow the flow of the fluid between the first sealing surface and the second sealing surface in response to a force exceeding the preload tension being exerted in line with the seal screw.

Abstract: The invention relates to the field of toolings for high-accuracy finishing through-holes and non-through-holes, such as for example for calibration, lapping operations. More precisely the invention refers to a tool-holding system for high-accuracy calibration of the type comprising a driving shaft (2) and a driven shaft (3) mutually connected by two cardan joints (5) and that provides an external cylindrical body (6) supported through bearings (8) by said driving shaft (2). The cylindrical body or liner (6) is closed on its bottom side by a driving bush oscillating in a plane perpendicular to the driven shaft rotation axis; said oscillations being compensated by elastic means. Axial compensation means for driven shaft movements are also provided. The liner (6) forms a chamber (7) that is kept full of oil.

Abstract: A coolant assembly for supplying coolant fluid to a tool includes an outer ring defining an inlet and an insert pressed within the outer ring including an annular channel. The annular channel is in communication with the inlet defined by the outer ring and includes a plurality of passages disposed to direct fluid along an axis of a tool. At least two of the passages are disposed at different angles relative to the axis of the tool to direct coolant along the entire length of the tool in order to provide a uniform and consistent stream of coolant and uniform and consistent temperature of the tool.

Abstract: There is provided a printed board machining apparatus that is capable of improving machining efficiency without hampering machining accuracy. The printed board machining apparatus includes a pressure foot which is provided with a port whose one end is opened at a lower surface of the pressure foot facing a stiffening plate, and whose other end is connected to a compressed gas source to blow out gas from the port at a pressure which does not interfere with the pressure foot pressurizing the stiffening plate and printed boards in machining the printed boards. It is noted that the gas is blown out during a period of time at least when the pressure foot and the stiffening plate are moving relatively in the horizontal direction.

Abstract: A stationary machine tool column supports a spindle head to be movable in an axial direction of the spindle. A table on which a workpiece is mounted is moved in directions orthogonal to the axial direction of the spindle. A cutting liquid feed device is fixed to the column through a support member and includes a cutting liquid nozzle and a shower nozzle. The cutting liquid nozzle is adapted to discharge cutting liquid toward a tool mounted to the spindle. The shower nozzle is adapted todischarge cutting liquid as a curtain of fluid to surround a cutting area.

Abstract: A drill bit assembly is formed to drill into an object while reliably conducting a fluid onto a point being drilled and subsequently into the object being drilled includes a sleeve that is bored and threaded and cut flush to substantially mate with the outside surface of a conducting tube. An elbow connector is mounted within the sleeve and receives a fluid from a tube coupled thereto. The drill bit assembly further includes a telescoping conduction tube for conducting fluid about the drill bit as it rotates and into an opening created by the drill bit. The telescoping conduction tube axially slides about the conduction tube and also conducts fluid about the drill bit while slidingly mating with the conduction tube to minimally leak the fluid.

Abstract: A spindle device of a machine tool, which can prevent the liquefaction of atomized cutting fluid in atomized cutting fluid passage downstream of a straightening unit 14, enhance a responsiveness to an ejecting start or stop instruction, and prevent a waste of cutting fluid. The spindle device for a machine tool has atomized cutting liquid passage (e1, e2) each having a single-shape passage section and formed inside the device ranging from the spindle 1 to the tip end of a cutting tool 13 mounted thereto in one piece, and is operated so as to eject atomized cutting tool 13 via the atomized cutting fluid passages (e1, e2), wherein a straightening unit 14 formed with a plurality of small-diameter passages h are provided in the middle of the cutting liquid passages (e1, e2).

Abstract: A multispindle machine tool, characterized in that outside cylindrical members (19) having a plurality of spindles (2) and fixed to a support frame (3b) are inserted into the center holes (2c) of the spindles, a mist generator (22) for generating lubricant mist in the spindles and inside cylindrical members (20) having the mist generator fixed to the tip thereof are installed on the inside of the outside cylindrical members so as to be withdrawn the outside cylindrical members held in fixed state so that, under the installed state, the mist generator can generate the lubricant mist since compressed air and liquid lubricant are separately fed from the outsides of the spindles thereto through the outside cylindrical members and the inside cylindrical members and the inside cylindrical members and, under the withdrawn state, the lubricant mist is fed from the outsides to the insides of the spindles through the outside cylindrical members to jet out the mist from the tips of the cutters fixed to the tips of the s

Abstract: A metalworking apparatus includes a threading insert with a channel-less chip breaker and a holder for holding the threading insert. The threading insert includes (i) one cooling channel disposed on the top side of the threading insert for each crest and each valley, which terminates near the cutting region, and (ii) a ceramic coating on at least the cutting region of crests and valleys, with each cooling channel being uncoated.

Abstract: A drill for chip removing machining includes a front cutting end, a rear securing portion, and a shank extending therebetween. The cutting end includes at least one cutting edge. The drill has at least one internal chip channel and at least one internal flush channel formed in a longitudinal pillar portion of the drill. All portions of the drill are formed of the same material, such as cemented carbide, wherein the chip channel has a surface roughness no greater than 0.5 ?m.

Abstract: To provide a method for machining a workpiece, whereby chips are removed from the workpiece, wherein sufficient lubrication of the machining tool and sufficient cooling of the machining tool and the workpiece being machined are ensured, and chips resulting from the machining are simultaneously prevented from remaining inside recesses in the workpiece, a method comprising the following method steps is proposed: introducing a lubricant in a flowable state into at least one recess of the workpiece; solidifying the lubricant in the recess; machining the workpiece, whereby chips are removed from the workpiece, with at least one machining tool coming into direct contact with the lubricant and being lubricated by the lubricant; transforming the lubricant remaining in the recess of the workpiece into the flowable state and removing the lubricant from the workpiece.

Abstract: A coolant system for a machining center includes a cutting tool selectively engageable with a work-piece and includes a pump for supplying a flow of coolant to the cutting tool, a motor drivingly engaging the pump, a pressure transducer measuring the pressure of the coolant being supplied to the cutting tool and a controller in communication with the pressure transducer and the motor. The controller compares the pressure measured to a predetermined target pressure and varies the speed of the motor to minimize deviation of the measured pressure from the target pressure.

Abstract: An automatic cutting liquid supply apparatus which automatically supplies a cutting liquid to each tool of a machine tool in accordance with predetermined optimal cutting liquid supply conditions that include variations over time during operation. The optimal supply conditions of the cutting liquid supply quantity (Q) are preset for each type of tool (1) in a control device (5). The control device (5) is constructed from a main control section (5a), which mainly controls the driving of the main shaft units (2) on which the tools (1) are mounted, and an automatic supply control section (5b), which automatically controls the cutting liquid supply quantities (Q). An input signal (Vin) corresponding to the supply conditions (preset) is inputted into the variable frequency generating device (5c) from the automatic supply control section (5b).

Abstract: A power feed attachment that has a coupling structure to couple it to a hand held drill. A double-acting cylinder, which has a piston and a rod, and is fixedly coupled to the coupling structure. A two-position valve assembly is configured for directing a pressurized fluid to the double-acting cylinder. When the two-position valve assembly is in a first position is directs a fluid to a first side of the piston moving the piston to a first position. When the two-position valve assembly is in the second position it directs the pressurized fluid to a second side of the piston to move the piston to a second position. An arm is coupled to the piston. A control mechanism having a housing and a control rod, wherein the control rod is movable within the housing of the control mechanism between an extended position and a retracted position.

Abstract: A cutting-oil coater that prevents oil spray from liquefying during conveying and improves the efficiency of work such as oil-refilling by forming a spray feed portion and an oil storage portion separately from each other and making it possible to adjust the arrangement position. A cutting-oil coater includes a spray feed portion, an oil storage portion, an oil feed means for feeding oil to the oil spray feed portion, and a spray conveying passage for conveying the oil spray inside the spray feed portion to the outside of the spray feed portion, wherein the spray feed portion and the oil storage portion are formed separately from each other and can be arranged in different positions respectively, and the arrangement can be adjusted. Thus, the spray feed portion is arranged in the vicinity of the cutting position of a machining tool and the fluid feed unit 11 is arranged at a place where a worker can carry out a work such as oil-refilling.

Abstract: The present invention relates to a nozzle for use in a metalworking process, whereby the nozzle is designed to precisely deliver an oil-containing liquid and non-flammable gas mixture onto the interface between a metalworking tool and a workpiece, whereby the nozzle is comprised of a tip and a valve body affixed to one another. Furthermore, the present invention relates to a method for cooling and lubricating a tool and workpiece during a metalworking process.

Abstract: The present invention provides a capped collet and a cap attached to the collet, which are capable of efficiently supplying a cooling fluid to a tool according to the type of the tool held therein, and of performing satisfactory cooling. The capped collet comprises: a collet body 10; a cap 11 which is attached to the top-end side of the collet body 10 in an attachable and detachable manner and which allows the tool to pierce therethrough; and a sealing member 12 placed between a tool holder 101 and the cap 11 in order to hermetically seal a space between them. The collet body 10 has a slot 13 formed at least from the top-end side thereof, and an annular projection 21 which is formed on the top-end side and which is coupled with the cap 11. The cap 1 has an annular groove 18 for coupling with the annular projection 21 of the collet body 10, and a cover 22 for covering the end face of the collet body 10 on the top-end side.

Abstract: A spindlehead for tools is insertable into a tool disk with holders provided for such spindleheads. A spindle holds the shank of the tool in its chuck at its front end section, and is rotatably mounted by a spindle bearing in a spindlehead housing. A coolant feed extends at least in part in the spindlehead housing to convey coolant to the tool via at least one coolant channel and an internal coolant feed line in the spindle. A sealing device with a throttling point is separated form parts of a drainage channel. The sealing device has at least one sealing ring enclosing the spindle. The sealing ring is longitudinally movable in the spindlehead housing coaxially with the spindle axis. After longitudinal movement into a sealing position, the sealing ring separates the internal coolant feed line from the associated parts of the drainage channel up to a specifiable leakage amount. The accuracy of machining with the tool may be increased and the installation space available can be better used.

Abstract: In a machining sequence a flow of coating fluid is applied, such as through a nozzle, to wet at least the cutting surface of a tool to be engaged with a part to perform a machining operation thereon. The fluid is applied quickly and dried or cured to form an adherent coating layer on the tool. Propylene glycol is an example of a suitable fluid. After the tool is wetted an energy source is placed in appropriate proximity to the wetted tool The energy source is energized to heat the tool, thereby raising its surface temperature sufficiently to dry the coating layer. This process, and the apparatus performing it, can be incorporated into the machining operation and the tool coating can be refurbished in situ, on a regular basis, before or after a machining operation as appropriate.

Abstract: A spindle device of a machine tool capable of preventing coolant mist from being excessively liquefied in an area between a mist outlet member 23 and near the rear end part of a tool 29, wherein a straight feed pipe 14 formed of a double tube having an inside tube 14a and an outside tube 14b is inserted into an inside hole formed at the center part of a spindle 2 in non-rotating state not coming into contact with the spindle, coolant is fed to the inside tube 14a, compressed air is fed to the outside tube 14b, and a mist generating member 16 is formed of both tubes near the inside tip part of the spindle, a mist outlet member 23 is installed into the outside tube 14b integrally with each on the mist outlet passage c of the mist generating member 16 so as to surround the mist outlet passage and a mist guiding extension member 24 allowed to reach near the rear end part of the tool in the center hole of the tool holder is installed, integrally with the spindle, on the other tool holder 8 side, and the mist guidi

Abstract: The present invention prevents coolant from leaking out of a valve (23) after a feed pump (4) stops feeding the coolant, and diminishes a time-lag between the onset of feeding the coolant and mist generation, when the feed pump (4) starts feeding the coolant again. In the machine tool of this invention, the coolant is fed from a feed pump (4) into a mist generating device (13) provided on the tip of a spindle (8) by way of a feed line (7), and a valve (23) is provided at an inflow part for coolant of the mist generating device (13) to be closed when the coolant pressure within the feed line (7) lowers below a fixed level. A coolant sucking and delivering (2) sucks a fixed amount of coolant in the feed line (7), when the feed pump (4) stops feeding the coolant. On the other hand, the device (2) feeds a fixed amount of coolant into the feed line (7), when the feed pump (4) begins feeding the coolant.

Abstract: To provide a method for machining a workpiece, whereby chips are removed from the workpiece, wherein sufficient lubrication of the machining tool and sufficient cooling of the machining tool and the workpiece being machined are ensured, and chips resulting from the machining are simultaneously prevented from remaining inside recesses in the workpiece, a method comprising the following method steps is proposed:

Abstract: A device for processing a workpiece which, for this purpose, is fixed inside a working space (or enclosure) in a machining center and is processed with the aid of a tool. To remove processing residues, a gas stream is made to flow through working space, which is formed, for this purpose, like a nozzle. So as to improve further the removal of undesired processing residues from working space, without at the same time increasing the performance of the devices generating air stream, the working space is widened after the narrowest cross sectional area, in the flow direction of gas stream, similar to a Laval nozzle, machining center being situated in the region of the greatest flow speed. Because of this arrangement, in addition, an undesired limitation of working space available for machining center may be avoided.

Abstract: A tool head for securing a tool in a machine tool has a stationary spindle bearing housing, a spindle rotatably supported in the spindle bearing housing, and a modular tool changing insert for receiving a tool. The tool changing insert is exchangeably arranged on the spindle or a holder. An internal cooling medium supply device supplies a cooling medium directly from the spindle bearing housing into the tool changing insert. The cooling medium supply device preferably supplies the cooling medium laterally into the tool changing insert via an auxiliary housing.