Abstract: For rolling a workpiece with a rolling tool with several rolling elements arranged in hydrostatic bearings, during rolling, only some of the rolling elements engage the workpiece, while the rolling elements not engaging the workpiece essentially seal off the hydrostatic bearing. In such a rolling tool, the rolling elements are arranged so as to be distributed over an area, and each of the hydrostatic bearings includes a circumferential seal in the region of the rolling elements.

Abstract: A method and an apparatus for edge shaping in a high-pressure fuel reservoir which has an elongated tubular casing element equipped in the longitudinal direction with a continuous recess which forms the interior space of the high-pressure fuel reservoir and is open at at least one end, the recess opening into at least one passthrough orifice, that together with the continuous recess forms a peripheral edge. An elongated actuation element, whose end inserted into the continuous recess is equipped with a surface segment inclined with respect to the longitudinal axis of the continuous recess, is inserted into the continuous recess, the surface segment acting at least indirectly on a pressure element introduced into the continuous recess so that a surface portion of the pressure element is pressed against the peripheral edge, and a smoothing of the edge contour is achieved because of a material displacement in the region of the edge.

Abstract: A method for producing a, in particular thin-walled, pipe conduit element with a surface structure reinforcing the pipe conduit element is proposed wherein the pipe conduit element continuously passes by at least one embossing element guided about the periphery of the jacket thereof and the surface structure is embossed onto the jacket of the pipe conduit element by the embossing element using pure mechanical pressure. For embossing the surface structure onto the pipe conduit element, an arrangement of preferably several embossing elements, in particular balls or rollers are used which are distributed about the periphery of the pipe conduit element jacket. The invention also concerns a device for producing a surface structured pipe conduit element using a guidance having embossing elements and which can be rotated about the periphery of the jacket of a pipe conduit element continuously supplied to the device.

Abstract: A method is disclosed for reducing the variance in the coolant consumption of components of a turbo-machine, in particular a gas turbine. The components are provided with one or more holes for the passage of a coolant, wherein a surface roughness existing inside the holes is reduced by mechanical finishing. The method is characterized by mechanical finishing that is performed by reshaping rough points that cause the surface roughness using a cold working process such as at least one of beating, pressing and rolling. The method permits a simple reduction of the surface roughness without creating finishing residues that could result in obstructions of the holes.

Abstract: Via a first path (P1) which extends for continuous treatment from one longitudinal end to the other of a cylinder head (H) passing between pairs of exhaust ports (15) and pairs of intake ports (14) opposed to each other with respect to one cylinder and which terminates in a tension bolt hole (21), and via second paths (P2P5) which, after treatment by this first path (P1), extend for successive treatment from cylinders adjacent the terminal point of the first path (P1) and between a pair of exhaust ports (15) and a pair of intake ports (14) opposed to each other and which terminate in tension bolt holes (21), the surface of the cylinder head (H) is stirred for refining without melting it by the heat from a rotating tool.

Abstract: A continuous firing structure is provided for color bullet of a cap gun. The cap gun has a main body with a machine unit. The continuous firing structure mainly comprises a bullet barrel at one end of the main body and a through hole between the bullet barrel and the unit for the operation of a pushing cylinder and a discharge pin. The pushing cylinder and the discharge pin are used with a spring for continuous firing.

Abstract: The present invention is a novel method for reducing tensile zones in the surface of a part comprising the steps of selecting a region of the part to be treated and programming a control unit of a burnishing apparatus to perform a burnishing operation, the burnishing operation being performed such that the density of burnishing and the magnitude of compression are varied to reduce the high tensile stress along the boundaries of the selected region. In a preferred embodiment of the invention the burnishing operation induces a deep layer of compression within the surface having associated cold working of less than about 5.0 percent.

Abstract: A support and holding structure (2) houses a fluid-operated actuator (17) controlling movement of a tool (7) close to and away from an object being marked (“A”) and movement means causing shifting of same on the surface (“S”) to be marked. The marking tool (7) comprises a ball or other engraving rolling element (7a) rotatably housed in a rolling seating (10) by interposition of small sliding balls (13). The rolling seating (10) has a rolling portion (10a) concentric with the engraving ball (7a), at which the efforts transmitted through the ball itself are discharged, and a recirculation portion (10b) spreading away from the rolling portion (10a) to ensure recirculation of the small sliding balls (13) during marking.

Abstract: A machining tool for manufacturing a radial bearing, and a manufacturing apparatus and a manufacturing method using the machining tool are provided. The machining tool includes an inner surface finishing tool to finish an inner circumference surface of a bearing hole provided on a radial bearing. The inner surface finishing tool includes a tool shaft main body member that defines a hollow storage section provided within the tool shaft main body member, a rotatable core piece member mounted inside the hollow storage section in a manner to be rotatable within the tool shaft main body member, and a plurality of roll machining members each with a circular cross-sectional roll machining surface. The plurality of roll machining members rollably abut against the outer circumference surface of the rotatable core piece member. The plurality of roll machining members are in contact under pressure with the inner circumference surface of the bearing hole.

Abstract: The present invention is a method for forming sheet material into contoured parts. The invention method includes these steps: A die is fashioned having an outside surface corresponding to the inside surface of the desired part. A plastically deformable sheet of material is clamped to the die so that the material is tangent to the die at a tangent area. A forming path is defined that follows the part's outside surface definition beginning at a point adjacent to the tangent area and tracing around the tangent area in circuits that incrementally offset away from the tangent area until all of the outside surface of the part is traced. A forming tool is then moved along the forming path as the die and the sheet of material remain stationary so that the end of the forming tool presses the sheet material against the die thereby gradually forming the sheet material against the die to produce a finished formed part.

Abstract: For rolling a workpiece with a rolling tool with several rolling elements arranged in hydrostatic bearings, during rolling, only some of the rolling elements engage the workpiece, while the rolling elements not engaging the workpiece essentially seal off the hydrostatic bearing. In such a rolling tool, the rolling elements are arranged so as to be distributed over an area, and each of the hydrostatic bearings includes a circumferential seal in the region of the rolling elements.

Abstract: A component rolling tool for applying a dynamic pressure groove comprising component rolling balls, cylindrical sleeve having an outer surface, an axis, a radius, a center hole, and guide holes, and being inserted into the bearing hole, and being relatively translated along the axis with respect to the bearing, and being relatively rotated about the axis with respect to the bearing, a moving roller coaxially inserted to the center hole, pressing the balls toward an outward direction of the guide holes and being moved along the axis in accordance with a pressure contact rotation between the balls and an inner peripheral surface of the bearing hole caused by a relative movement between the sleeve and the bearing, and a returning apparatus for returning the roller to an initial position at a desired timing in a state that the balls is released from a pressure contact with the inner peripheral surface.

Abstract: A manufacturing tool is inserted in a hole formed in a work piece for forming a fluid bearing groove on an inner peripheral surface of the hole. A tool shaft is rotated in the hole while being moved in an axial direction thereof. A plurality of balls are rotatably supported on an outer peripheral face of the tool shaft. The balls are to be abutted against the inner peripheral surface of the hole to form the fluid bearing groove thereon in accordance with the movement of the tool shaft. A retainer is detachably fitted on the outer peripheral face of the tool shaft so as to retain the balls on the tool shaft. A fixing member is detachably fitted with the tool shaft so as to fix the retainer on the tool shaft. The balls can be replaced when the fixing member and the retainer is detached from the tool shaft.

Abstract: The present invention is an apparatus for manufacturing an internal grooved tube, in which has a rotary die and a working head having a plurality of balls retained inside in such a way as to rotate with play are provided along the drawing direction of a metal blank tube in order and in such a way as to rotate separately, which is constructed in such a way that multiple grooves are formed in the internal surface of the metal blank tube by pressing the metal blank tube where a plug and a grooved plug rotatably coupled to the plug are inserted against the outer surface of the grooved plug as the metal blank tube is put through the rotary die and the working head and drawn, and which has lubricating-oil feeding units and separatedly provided at upstream sides of the rotary die and the working head.

Abstract: A system for removing dents from metal or other materials comprising (i) a device which includes at least one magnet having a handle detachably held to a portion of the magnet by magnetic attraction and a roller detachably held to a portion of the magnet opposite the handle by the magnetic forces of the magnet; and (ii) a method which includes the steps of attaching the magnet to the handle, placing the roller inside the tubing of a dented instrument, placing the portion of the magnet opposite the handle against the exterior of the instrument, catching or acquiring the roller with the magnet such that the magnet and the roller form a magnetic assembly, wherein the roller is on the interior of the instrument and the magnet is on the exterior of the instrument, and moving, sliding, or rocking the magnetic assembly across the dents until the dents are removed from the metal.

Abstract: A system for removing dents from metal comprising (i) a device which includes at least one magnet having a handle detachably held to a portion of the magnet by magnetic attraction and a roller detachably held to a portion of the magnet opposite the handle by the magnetic forces of the magnet; and (ii) a method which includes the steps of attaching the magnet to the handle, placing the roller inside the tubing of a dented instrument, placing the portion of the magnet opposite the handle against the exterior of the instrument, catching or acquiring the roller with the magnet such that the magnet and the roller form a magnetic assembly, wherein the roller is on the interior of the instrument and the magnet is on the exterior of the instrument, and moving, sliding, or rocking the magnetic assembly across the dents until the dents are removed from the metal.

Abstract: The present invention is an apparatus for manufacturing an internal grooved tube, in which has a rotary die and a working head having a plurality of balls retained inside in such a way as to rotate with play are provided along the drawing direction of a metal blank tube in order and in such a way as to rotate separately, which is constructed in such a way that multiple grooves are formed in the internal surface of the metal blank tube by pressing the metal blank tube where a plug and a grooved plug rotatably coupled to the plug are inserted against the outer surface of the grooved plug as the metal blank tube is put through the rotary die and the working head and drawn, and which has lubricating-oil feeding units and separatedly provided at upstream sides of the rotary die and the working head.

Abstract: The present invention is a novel method and an apparatus for implementing the method of inducing a layer of compressive residual stress along the surface of a part comprising the steps of selecting a region of the part to be treated; selecting the magnitude of compression and the residual stress distribution to be induced in the surface of the selected region of the part; exerting pressure against the surface of the selected region, the pressure being applied in a selected pattern along the surface to form zones of deformation having a deep layer of compressive stress; and varying the pressure being exerted against the surface to produce the desired residual stress distribution and magnitude of compression within the surface.

Abstract: A burnishing apparatus is provided for burnishing a surface of a material. The burnishing apparatus includes a guide member having an annular groove which is eccentric to the rotating axis of the guide member. A rolling element is disposed between the groove and the surface of the material. The rolling element has a radius r, an effective rolling radius on the guide member r1, and an effective rolling radius r2 on the surface of the material, and r=r2 and r1<r2. Due to the combined effects of an eccentric groove and r1<r2, a variable track is left on the surface of the material as the rolling element rolls along the groove and on the surface of the material. The variable track repeats after the rolling element revolves around the surface of the material N revolutions. The burnishing apparatus may further include an actuator which drives a top cover onto the material to force the surface of the material on the rolling element. The burnishing disk may be rotatively driven by a motor.

Abstract: A component rolling tool for applying a dynamic pressure groove comprising component rolling balls, cylindrical sleeve having an outer surface, an axis, a radius, a center hole, and guide holes, and being inserted into the bearing hole, and being relatively translated along the axis with respect to the bearing, and being relatively rotated about the axis with respect to the bearing, a moving roller coaxially inserted to the center hole, pressing the balls toward an outward direction of the guide holes and being moved along the axis in accordance with a pressure contact rotation between the balls and an inner peripheral surface of the bearing hole caused by a relative movement between the sleeve and the bearing, and a returning apparatus for returning the roller to an initial position at a desired timing in a state that the balls is released from a pressure contact with the inner peripheral surface.

Abstract: An apparatus and method for creating a flange around a preformed opening in a wall of a tubular member. The apparatus includes an elongated guidance housing adapted to fit within the tubular member. An elongated presser having at least one pressing surface is slidably received within the guidance housing. A punch member is located adjacent the pressing surface within the guidance housing. The punch member is sized to fit at least partially through a side opening in the guidance housing and at least partially through the preformed opening. When the presser is advanced relative to the guidance housing, the pressing surface to urges the punch-through the side opening and through the preformed opening. The movement of the punch thereby forms an outwardly upstanding annular flange extending around the preformed opening in the tubular member.

Abstract: A flow-forming device includes a forming device having a cage in which a plurality of rolling members are rotatably arranged in ring-like manner about a rotation axis. A spinning chuck is configured to hold a blank so as to be axially displaceable relative to the forming device. A drive is provided for rotating the blank relative to said forming device. A method for flow-forming includes rotating at least one of the blank and the rolling member about a rotation axis and flow-forming the blank through contact with a plurality of rolling members which are arranged in a ring-like manner around the rotation axis and mounted in rotary manner in a cage.

Abstract: The invention relates to an apparatus for the dieless forming of a sheet. The apparatus comprises a pressing mechanism and a sheet holding mechanism which are moved with respect to each other in X, Y and Z-axis directions and has a fixed ceiling plate form having a plane shape matching the bottom profile of a product to be formed; a framelike support plate surrounding the ceiling plate form is raised and lowered by at least one pair of raising/lowering actuators, and restraining actuators apply a controllable restraining force to the sheet byway of a framelike restraining plate clamping the periphery of the sheet in the sheet thickness direction between itself and the support plate. A mechanism for causing the support plate to undergo balanced movement and a material flow control mechanism may be preferably further provided.

Abstract: A method of reducing debris within an E-block of an actuator assembly in a disc drive is provided. A manufactured E-block is first provided for tooling. The E-block has a central bore with an inner diameter and a bore surface. A hardening member is then provided with an outer diameter that is larger than the inner diameter of the bore surface. The hardening member is pressed through the central bore so that the hardening member compresses and deforms the bore surface. As the hardening member deforms the bore surface, the bore surface becomes substantially smooth and hard.

Abstract: A deforming tool for forming an elongated deformation in a planer workpiece includes cooperating upper and lower parts, a roller ball being mounted in one of the parts and cooperating with a mating element in the other part, the workpiece being engaged above and below by the two parts. The roller ball is mounted for universal movement and thus allows for sharper turns when moving the workpiece without the risk of damage to the workpiece.

Abstract: A surface smoothing system for smoothing a burr formed on a surface of a workpiece without dispersing waste dust includes a holder provided with a plurality of curved parts each projecting therefrom in a rocking manner and a rotation drive unit for rotating an end face from where the curved part held by the holder partially projects so that the curved parts contact the workpiece and smooth out the burr.

Abstract: An apparatus for forming grooves in the surface of an article is disclosed. The apparatus includes a cage which has a circular cage wall with an annular pattern of holes in the wall. The apparatus also includes a plurality of spherical balls, each rotatably disposed in a respective hole of the cage wall and has a diameter greater than the wall thickness. The apparatus further includes a pin located within the cage, the pin has a circumferential groove in a plane coincident with the plurality of spherical balls and holes in the cage wall so that the pin holds the balls in the groove, the balls protruding through the cage wall and engaging the surface of a workpiece to be grooved so that the balls roll in the groove in the pin and, with movement of the workpiece and the apparatus, cause grooves to be formed in the interior surface of the workpiece.

Abstract: For fastening a fluid line 10" which can be inserted into a connection bore 9 with a connection end 10 there is an abutment 11 on the outer diameter in the area of the connection end 10 which, when the plug-type connection is put together, limits the axial movement of the connection end 10, by means of a permanently deformed retaining area 13 of the connection piece 8 outside the abutment 11 at least under partial contraction of the connection bore 9 which forms the retaining element.

Abstract: The burnishing method and apparatus for implementing the method of the present invention utilizes a single-point burnishing process to provide deep compression with a minimal amount of cold working and surface hardening. In particular, the area to be burnished along the surface of a workpiece is defined and a freely rotating burnishing ball is forced against the surface of the workpiece to produce a zone of deformation having a deep layer of compression within the surface. The burnishing ball is then rolled over the surface in a substantially nonoverlapping pattern. A preferred embodiment of the burnishing apparatus for implementing the burnishing method comprises a socket having a tip member incorporating a ball seat, a burnishing ball disposed within the ball seat, a rod member integrally formed with the tip member; and a socket support for supporting the socket on a conventional tool holder.

Abstract: In an apparatus for fabricating a fluid bearing having a dynamic-pressure-generating track slot installed in the internal diametric surface of a sleeve, a ball-escape-preventing device is coupled with a rotary shaft being in contact with one end thereof so as to form the identical outer diametric surface with that of the rotary shaft to support the ball. Therefore, it is not necessary to control the angular velocity and axial transfer velocity of a guide bushing or ring with respect to those of the rotary shaft. Also, a fluid bearing of a high precision and high efficiency can be fabricated with an inexpensive and simple device by which ball wear due to rolling can be reduced and the ball is easily replaced when worn.

Abstract: The invention relates to a working tool for working a pipe wall, so that a grooving is created on the inner wall of the pipe. The grooving is carried out by means of a rotating working tool of a grooving machine, and according to the invention, the structure of said tool brings about an efficient use and replacing of the balls provided in the tool for working the pipe to be grooved; it also enables the replacing of the balls without replacing the whole tool.

Abstract: An inner grooved tube forming apparatus capable of manufacturing an inner grooved tube with a stable quality by reducing the weight of each member and improving the durability to allow high-speed rotation of a planetary ball die. A grooved plug 12 is fixed to the front end of a mandrel 11, and is in contact with the inner surface of a mother tube 10. Balls 13 are in contact with the outer surface of the mother tube 10. The balls 13 are accommodated inside a ball track retaining outer ring 14. A ball retainer 20 is provided inside the outer ring 14 to retain the balls 13. The outer ring 14 is fixed to a rotating shaft 19 by a cylinder 16 and a front cap 17. A bearing 21 is mounted inside the cylinder 16, and a support member 22 is rotatably supported through the bearing 21 to the cylinder 16. The outer ring 14 and the support member 22 are formed of ceramic, and the ball retainer 20 is formed of synthetic resin.

Abstract: An expanding mandrel (10) used mainly for expanding heat exchanging tubes (21) of a cross fin coil (20) of an air conditioning machine, so as to connect them to fins of the cross fin coil. The expanding mandrel has flexibilty, comprising a plurality of mandrel pieces (11) which are bandably connected in a row, with an expanding head (13) disposed at the leading end. By an expanding method and an expanding apparatus both using the mandrel (10), the mandrel (10) is wound on the winding drum (41); is fed from the winding drum (41) so as to be inserted into the heat exchanging tube (21) of the cross fin coil so as to be expanded at the time of tube expansion; and is retracted from the heat exchanging tube (21), after completion of the expanding, so as to be wound on the winding drum (41). This provides a decreased size of the apparatus and allows even an expansion of a heat exchanging tube which has been bend-processed.

Abstract: A burring processing method for performing burring processing for a metallic pipe 90 within a short time to provide a beautifully finished appearance. A jig with an inclined section 15 is inserted into the inside of the metallic pipe 90 with a prepared hole 91. After the jig and the metallic pipe 90 are fixed in a state that the inclined section 15 of the jig is aligned with the prepared hole 91, steel balls 41 having a diameter greater than that of the prepared hole 91 are pressed against the inclined section 15 inside the metallic pipe 90 so that the steel ball 41 is pushed from under the prepared hole 91 to the outside of the metallic pipe 90.

Abstract: A roll peening device includes a shank having a head with an annular groove that carries at least one ball which is held therein by a retainer such that the application of the ball to a workpiece in combination with rotating motion causes deformation of the workpiece and is particularly useful in a process of retaining a part in an opening.

Abstract: Apparatus for effecting domain refinement of electrical steels comprises an assembly of an array of rotatable members (2) mounted within a supporting structure (3) and movable into direct contact with the surface of a strip or sheet of electrical steel to create lines of local plastic deformation which extends generally across the width of the steel to effect domain refinement thereof. Relative linear movement is imparted between the member and the steel strip or sheet.

Abstract: A helical groove for conducting lubricant is formed in an internal cylindrical surface of a bearing member by pressing a plurality of balls against the surface while effecting relative longitudinal and rotational movement between the bearing member and a ball-carrier which carries the balls. The balls roll along the cylindrical surface and press-form the helical groove therein. To enable the ball carrier to be inserted into the bearing, the balls are held in a retracted state by applying a vacuum to the balls.

Abstract: A method for producing a nozzle holder for an injection valve, having a valve closing member comprising an armature and a valve closing body, disposed within a nozzle holder. The nozzle holder has a bore which is provided with at least one guide protrusion on end and that extends at least partway around the bore. The guide protrusion is stamped into a guide segment of the nozzle holder. The injection valve is especially suited for fuel injection systems of mixture-compressing internal combustion engines with externally supplied ignition.

Abstract: A device for grooving the internal surface of tubes is disclosed as including a holding die for holding in position inside the tube a floating chuck equipped with a grooved chuck and a grooving unit including a rotating cage for retaining a number of rotating balls for compressing the tube wall against the grooved chuck to form a groove in the tube. The grooving unit includes a finishing die. The rotating cage includes a supporting member of which the internal profile, in an axial section is an arc of a circle, and a cage closure plate for retaining the balls in the cage and further includes a lubricator for the interior of the cage.

Abstract: A plurality of processing balls with different outer diameters are prepared at a slidable or rotatable upper stage. One ball, selected from the plurality of prepared balls in correspondence with the inner diameter of a bore of a workpiece, is inserted through the bore while being pressed by a pin.

Abstract: A moveable cage which has a pattern of holes surrounding and concentric with a central axis of the cage, and a short hard pin located within the cage, and movable back and forth between the two ends of the cage. A single drive device attached to the cage causes both translation and rotation of the cage. As the cage is advanced and rotated, the interior pin is caused to move backward and forward as the balls roll over the surface of the pin, so that the wear on the balls and on the surface of the interior pin is evenly distributed.

Abstract: A short cylindrical and thin sleeve bearing including a radial bearing portion of a dynamic pressure type on which grooves are formed is worked with high accuracy. Grooves are formed on an inner peripheral surface of a blank by a groove forming tool. Raised deformations generated on the inner peripheral surface as a result of this groove forming are removed by ball sizing of passing a steel ball on the inner peripheral surface. Further, by a roller burnishing tool, the cylindrical bore of the bearing is finished to have a predetermined diameter, and simultaneously, specular finish of the inner peripheral surface is effected.

Abstract: A device for forming a spiral groove on the inner walls of a cylindrical cavity including a rod having a cylindrical recess and pair of through holes, machining balls in the through holes, a tapered support located in the cylindrical recess, whose tapered sides support the machining balls, a spring located between the support and the other end of the cylindrical recess for supporting the support, and a push cap coupled to the aperture of the recess for deciding the location of the support by pressing the support supported by the spring. The device can freely adjust the height of the machining balls protruding from in the through holes according to the inner diameter of a bearing's cylindrical cavity, thereby easily forming spiral grooves of uniform depth.

Abstract: Apparatus and method for forming external raised beads on hollow rigid tubing. The apparatus includes an adjusting screw threadably mounted into a threaded body member having one or more balls mounted in apertures in the body member. The body member is inserted into one end of the hollow tubing, the balls being disposed inside of the body member between a reduced diameter portion of the screw and the inner wall of the body member. When the screw is threaded into the body member, the balls are forced outwardly against the inner wall of the tubing forming a raised bead on the exterior of the tubing. Continued rotation of the screw and body member increases the height of the bead.

Abstract: The device is intended for expanding profile pipes set in a well for patching off a troublesome zone, and also for straightening crumpled casings.The device comprises a housing (1) having an expanding member (3) mounted thereon in bearings (4, 5) on a journal (2) extending at an acute angel to the longitudinal axis of the housing (1). The expanding member (3) is shaped as a spherical segment (9) having its external surface defined by alternating portions of a spherical surface (10) and the lateral surfaces of cylinders (11) whose geometric axes being to a plane perpendicular to the axis (13) of the journal (2).

Abstract: A device for bending or levelling workpieces by means of shot peening is improved by controlled impacting and indenting using a support element having a rear wall and side walls; a plurality of force spaced apart distributing elements are arranged in the support element and in the least one layer so that at least some of them abut the rear wall of the support element; a plurality of indenting, shot peening elements in engagement with at least some of the force distributing elements in that any of the shot peening elements engage at least two of the force distributing elements; there are elements of one of the plurality which abut the side walls of the support element.

Abstract: A rolling milling tool is constructed so that the roller, in the form of a sphere, or cylinder or cone, is supported in a hydrostatic bearing to avoid counter rollers, thereby reducing the size of such tools. The roller is held in a bearing socket or guide chamber which may provide for an axial play of the roller in the chamber. The bearing socket or guide chamber is formed in a roller head which may be itself constructed for being chucked in a tool holder, or the roller head may be received in a housing which is held in a tool holder of a machine tool, such as a lathe. Ducts connect the hydrostatic bearing to a source of fluid pressure. The tool is suitable for a smooth rolling and/or work hardening roller operation.

Abstract: The present invention is directed to a method and apparatus for simultaneously producing multiple linear grooves on the internal surface of cylindrical tubes. The apparatus comprises an outer cage assembly with a mandrel assembly axially and slideably disposed therein. Additionally, each assembly is capable of independent nonrotational linear motion. The cage assembly is introduced into the inner diameter of the tube along their common cylindrical axis. A multiplicity of spherical roller elements, retained within circumferentially spaced ports near the entry end of the cage assembly maintain resting contact with the mandrel assembly disposed within the cage assembly. The entry end of the mandrel assembly is conically tapered to define a range of radial motion for the rollers upon linear movement of the mandrel assembly. This linear movement of the mandrel assembly generates radial expansion of the circumferentially spaced rollers into pressing contact with the pressure tube.

Abstract: The invention relates to a drywall corner bead spreader device. The device comprises a stationary support portion and a movable pressure applying portion. When a length of drywall corner bead is placed on the stationary support portion with its flanges facing upwardly adjustment of the movable pressure applying portion into contact with the flanges will force the flanges to assume an included angle greater than its normal ninety degree orientation. The movable pressure applying portion includes a freely rotating spreader ball which will rotate as the corner bead is pulled from beneath the spreader ball resulting in reduced friction and providing a uniform included angle to the flanges in excess of ninety degrees.

Abstract: An improved machine for forming a plurality of thin, spiral grooves in the inner surface of a metal pipe. A grooving plug is inserted and held in the metal pipe in such a manner that its axial position is constant and the metal pipe, while being moved longitudinally, is pressed by a plurality of balls which rotate planetarily around the outer surface of the metal pipe at a position corresponding to the position of the grooving plug to continuously form a plurality of spiral grooves in the inner surface of the metal pipe. Thereafter, the metal pipe is finished through a die. The machine manufactures at a high rate metal pipe which has a smooth outer surface and a grooved inner surface.