Abstract: A cutting tool body includes a net-shaped steel body that has an axial forward end and an axial rearward end. The net-shaped steel body contains at the axial forward end thereof a cold-headed socket. The net-shaped steel body further contains a cold-headed puller groove axial rearward of the cold-headed socket.

Abstract: A method of creep forming a metallic component is provided. The method includes the steps of applying static loading and cyclic loading and/or vibration to the component during the creep forming thereof to act as a source of additional energy.

Abstract: The positioning of the actuating drive in a fuel injector with a piezoactor (2) that is screwed into the housing (1) of the fuel injector is performed by applying a voltage (U) to the piezoactor (2) that corresponds to a given idle stroke (h), and the surface grinding of the housing (3) and base plate (4) of the piezoactor (2) when voltage is applied. Between the housing (1) of the fuel injector and the housing (3) of the piezoactor (2), there is also provided a compensation collar (9) of a suitable thickness.

Abstract: A method and apparatus for optimizing the forging of a workpiece that is moved along a longitudinal axis of a forging press. The method includes detecting the relative positions of the first and second ends of the workpiece along the longitudinal axis and calculating a length of the workpiece therebetween.

Abstract: A hot forge forming facility includes at least a material supply device, a heating device, a guiding device and a punching device. The material supply device carries a continuous supply of metal material in rolls. The heating device heats and softens the metal material. The guiding device guides and drives the metal material to the heating device. The punching device compresses, forms and cuts the softened metal material in continuous punching operation to smoothly and quickly produce desired products that are consistent with actual production requirements.

Abstract: A closed forging method for producing a forged product includes preparing as a forging material a cylindrical cast ingot that has a volume the same as the volume of a forged product and assumes a shape having an upper surface, a lower surface and a side surface and containing no angular portion; and applying pressure to the side surface of the forging material. The shape has a ratio of the lateral length of a projection profile of the forging material as viewed in the direction perpendicular to the direction of pressure application to a length of the forging material as measured in the direction of pressure application is 1 or less. The forged product obtained is a preform of an upper arm or a lower arm with a plurality of branches that is a suspension part for a vehicle or a yoke with a plurality of branches that is a joint part employed in a vehicle suspension. The preform or yoke has metal flow lines along each branch and exhibits enhanced mechanical strength.

Abstract: A method of producing a forged part includes holding a material by a jig, upsetting the material, held by the jig, to a predetermined length by a pair of upsetting dies disposed on both ends of the material, while pressing the upsetting dies on the material, so as to produce large-diameter portions at the respective axial ends of the material. Next, a bending operation and a forging operation are made to the upset material, in that order. When forging, a direction, in which the material is forged, is set, so that a burr generated on the material by upsetting is included in a burr generated on the material by forging. Next, a finish-machining operation is made to the forged material to remove the burr left on the outer periphery of the material after forging. Thereafter, the finish-machined material is drilled to form bush-mounting holes in the large-diameter portions.

Abstract: A method of producing a valve metal mill form having dimensions sufficient to be divided to form a plurality of sputter targets is described. The method includes multidirectional deformation of an ingot to form a mill form having a preferred average grain size of about 100 microns or less and/or a texture substantially void of textural bands.

Abstract: A method comprises steps of providing bar stock, cutting the stock to form a rod-shaped blank, and stamp-forming a ball section on a first end of the blank in a transfer die. The method further includes stamp-forming an apertured flattened section on a second end of the blank to form a final product in the transfer die, and axially striking opposing ends to accurately form a length of the blank. A related transfer die apparatus includes stations for cutting and then stamp-forming a ball section on a first end of the blank, and stamp-forming an apertured flattened section on a second end of the blank to form a final product.

Abstract: A method for manufacturing a surgical needle devoid of a grinding process includes the steps of swaging a needle blank to define a substantially tapered or conical needle end, pressing the tapered needle to form a plurality of intersecting surfaces and forming cutting edges along the lines of intersection of the intersecting sides. The needle may be subjected to an etching process (e.g., an acid bath) to sharpen the cutting edges and/or provide a matte finish on the needle. The needle produced by the novel process is extremely sharp and durable, and exhibits an enhanced retention of sharpness relative to conventional ground needles over periods of prolonged use.

Abstract: Method and apparatus for producing a thin walled tubular product with thickened flange. A first stage metalworking (drawing) of a circular plate material A is done by using a first die set 22 having a conical die 24 and a drawing punch 26 is done in a manner that the end of the blank plate is remained on the conical surface 24-1 of the die, so that a semi-finished tubular product A1 with a inclined flange A1-1 is obtained. Then, a second stage metalworking (drawing) of the semi-finished tubular product A1 is done by a second die set 32 having a shaping punch 34 and a restraint die 36. The semi-finished tubular product A1 is held by the restraint die 36 and the shaping punch 34 is introduced into the semi-finished tubular product A1 for effecting a wall thickness reduction under ironing principle while forming a stepped portion.

Abstract: A method for cold working metal structures. A compound indenter is used to produce deformation in a workpiece, to provide a selected beneficial residual stress profile, to provide improved fatigue life structures with minimal manufacturing steps. A compound indenter deforms a workpiece, resulting in dimples therein. A relatively uniform beneficial residual stress profile is provided at the surface and at the midplane of apertures in a workpiece, so as to improve overall fatigue life. A compound indenter tool having a first, elongate indenter with a shaped indenter surface portion, and a second shaped indenter surrounding the first indenter and forming an annular shoulder recessed from the surface portion of the first indenter, is used. Optionally, a foot having a bottom portion is used to confiningly surround an indenter during application of deforming force to the surface of a workpiece, to prevent deformation of adjacent workpiece surface.

Abstract: When an actuator is operated, an upper die is displaced downwardly, pressing a lower surface of a workpiece against a forming surface. After the upper die is displaced upwardly, an ejecting member is displaced upwardly to push the workpiece upwardly by a lower die. As the workpiece is displaced upwardly, an outer circumferential surface of the workpiece is squeezed by a squeezer projecting radially inwardly from an inner circumferential surface of an outer ring.

Abstract: A curvature forming device has an upper member and a lower member. A clamping member is mounted on a spring within a recess in the upper member. An elongate deforming member is fixedly mounted in the same recess. The deforming member protrudes out of the recess more at one end than at the other. The upper member is pressed down against a flat anvil or die of a lower member, with a metal strip between them. The clamping member clamps the strip, whilst the deforming member deforms a small length of it. The upper member is raised and the strip moved forward a little bit. The upper member is then brought down again to clamp and deform the adjacent small length. Each deformed portion is generally fan shaped. These build up to produce a curve in the strip.

Abstract: A one piece extruded differential side gear comprising internal splines which are used to connect to a drive shaft. The differential side gear includes outer circular gear teeth and defines a rectilinear blind hole in which an end portion of the drive shaft is received. The circular gear teeth and the blind hole are coaxially oriented along an axis of the differential side gear.

Abstract: A method of making a part with regions of different thickness from a plate workpiece having a pair of substantially parallel plate faces. The workpiece is fitted between a surface of a die and a substantially parallel surface of a punch. The die is formed at its surface with an opening. Then the die and the punch are relatively shifted parallel to the surfaces and faces and so as to compress the workpiece parallel to its faces to extrude the workpiece transversely into the opening in the die surface, thereby creating a region of greater thickness.

Abstract: Metal cold-working tooling and a method of employing such tooling. The tooling is used to produce deformation in a workpiece, to provide a selected beneficial residual stress profile in the workpiece, in order to provide high fatigue life structures in a minimum number of manufacturing steps. An indenter is used to coldwork a workpiece, causing dimples in the workpiece. Preferably, the dimples are provided with a shape formed by application of a uniform pressure profile to the workpiece surface. As optimized, a relatively uniform beneficial residual stress profile is provided at both the surface and at the midplane apertures in a workpiece, so as to improve overall fatigue life. Also, an improved indenter tool profile shape is described, having a smoothly curved indenter surface portion. And, the use of consumable lamina wafers provides the benefit of easy application of uniform stress profile to a workpiece.

Abstract: A male die for forming a member incorporated in a liquid ejection head is disclosed. Each of a plurality of first forging punches is operable to form a first recess on a metal plate. The first forging punches are arranged at a fixed pitch to form a punch row in a first direction. Each of a plurality of second forging punches is operable to form a second recess on the metal plate. The second forging punches are arranged adjacently to first forging punches located at both ends of the punch row. The first recess is to be a first part of the member which is used to eject liquid from the liquid ejection head, and the second recess is to be a second part of the member which is not used to eject liquid.

Abstract: The device comprises a stamping member (2) arranged to be conveyed towards and hit a material body (1) with such a velocity that a rebound motion of the stamping member (2) is generated while a permanent deformation of the material body (1) is generated. The device has structure (3) for counteracting the rebound and generating at least one additional impact of the stamping member (2) against the material body (1) within a period, during which kinetic energy in the material body (1) generates an additional deformation in the body.

Abstract: A raw parallelepiped metal piece is pressed into a closed mold to provide a nut blank that has a generally square pilot portion (14) for piercing a metal panel, the nut blank having a pair of flanges (16) that continue from opposite side walls (15) of the pilot portion. Then, the nut blank is coined to form ridges (20) extending along and integral with opposite upper edges of the side walls (15), before pressed within an open mold so that the ridges are swaged out sideways to form shoulders (21). A lateral groove (22) is defined between below each shoulder and in the side wall. A rough bore (23) will be formed axially through the pilot portion (14), before tapped to have a female thread (24) in the inner periphery of the bore.

Abstract: Method and apparatus for making a rotary die blade from a straight blade blank to be conformable to the contour of the rotary die block include inserting a blade blank between a first press face of a first presser and a second press face of a second presser; and compressing the blade blank by urging either of the first press face or the second press face to the other, thereby elongating the blade blank along its length; wherein the compressive force is differentiated such that a stronger compressive force is applied to the peripheral portion of the blade blank than the inner portion thereof.

Abstract: Methods for manufacturing a flanged article (21) that comprises a central depressed body (27) and a peripheral flange (23) may include press forming a material (10) in order to form an intermediate flanged article (20) that comprises a central depressed body (26) and a peripheral flange (22). Then, the peripheral flange of the intermediate flanged article may be circumferentially squeezed in order to thicken the peripheral flange due to plastic flow caused by plastic deformation. The press forming step optionally may include forming a toothed portion (24) on an inner surface (22a) of the peripheral flange. The squeezing step optionally may include reshaping the toothed portion. Apparatus (1, 2) for performing each of these method steps are also described.

Abstract: The invention relates to a differential side gear comprising internal splines (11) which are used to connect a drive shaft. The inventive differential side gear comprises circular gear teeth (3) and defines a rectilinear blind hole (4) which is used to house and connect an end portion of the drive shaft. Said differential side gear comprises a single forged piece. The aforementioned circular gear teeth (3) and the blind hole (4) are disposed in a coaxial manner and are centred on a rotation axis (X-X′) of the differential side gear.

Abstract: A method of manufacturing a wear resistant shoe (26) includes upsetting (46) one end portion (38) of cylindrical member to work harden that portion to a substantial depth, machining (48) the cylindrical member portion to finished dimensions and surface hardening (56) a face (28 or 34) of the machined cylindrical member portion. The cylindrical member may comprise rod stock of a diameter less than the greatest diameter of the finished shoe and be upset or swaged to axially reduce and radially increase the dimensions of the one end portion. A hollow region (30) is formed in an opposite rod stock end portion and the periphery (50) of the hollow region is crimped about a rounded end (18) of the piston (20). The cold work done during the swaging or forming process provides a foundation for hardened faces comprising balance (28) and auxiliary balance (34) lands, forms a crude shape of the shoe, and imparts work hardening and wear property improvements.

Abstract: A method of creep forming a metallic component is provided. The method includes the steps of applying static loading and cyclic loading and/or vibration to the component during the creep forming thereof to act as a source of additional energy.

Abstract: A suspension component for an automobile, such as a stabilizer bar, is provided and includes at least one localized portion having a strengthened outer surface. The localized portion is positioned at a location of highest stress along the suspension component. A method of forming the suspension component is also disclosed.

Abstract: Billett forging method involves heating and forging with two manipulator press in several passes by four-sided reduction in four-headed forging devices and transversal direction metal macro-shears. In temperature range, rough and final forging is carried out enclosing 40 to 100% of the cross-section perimeter of the billet. Forging system comprises forging press with top and bottom plates having locks arranging and fixing forging tools, a movable tool table positioning changeable forging tools, as two or more four-headed forging devices and one or two manipulators. Four-headed forging devices for rough and final forging are disposed on the table. Free space between the final forging device closed heads is 1.1-1.4 times less than the space between the rough forging heads. Working surface planes of rough forging device heads are parallel to the reference plane of the head, and two adjacent lateral planes arranged on two sides at a 135-170 ° angle.

Abstract: A method of manufacturing a steel ball for a rolling bearing, said method comprising: a molding step of forming a steel wire cut at a predetermined length into a raw ball having a band portion by a pair of molding forms having respectively hemispherical concave portions and relief grooves in peripheries of said concave portions on their respective opposing faces, said band portion being formed on a surface of said raw ball along said relief grooves by compressing said steel wire by said molding forms in a state in which both ends of said steel wire are sandwiched between said concave portions; and a tumbler working step of removing said band portion from the surface of the raw ball by tumbling.

Abstract: A passive-adaptive indentor is provided for cold working a material that includes a material surface and a depth extending in a direction that is perpendicular to a direction of the material surface. The passive-adaptive indentor has a first member that includes a first working end that is configured to create a first residual stress field that extends to a predetermined depth in the material. The passive-adaptive indentor also has a second member that includes a second working end that is configured to create a second residual stress field that extends to a generally fixed second depth of the material regardless of the depth to which the first residual stress field extends. A method of using a passive-adaptive indentor for cold working a material is also presented.

Abstract: A presently-preferred process for manufacturing a connecting rod comprises placing a heated preform suitable for being formed into the connecting rod into a closed forge die, and forging the preform in a first forging operation while the preform is at a forging temperature to form an as-forged connecting rod having vertical flash extending therefrom. The presently-preferred process further comprises placing the as-forged connecting rod in a second forge die while the as-forged connecting rod is at a temperature substantially equal to the forging temperature, and forging the vertical flash in a second forging operation. The presently-preferred process also comprises removing the as-forged connecting rod from the second forge die, and machining the as-forged connecting rod to predetermined dimensions.

Abstract: A compound indenter for metal coldwork, and a method of employing such tooling. The compound indenter tool is used to produce deformation in a workpiece structure, to provide a selected beneficial residual stress profile in the workpiece, in order to provide high fatigue life structures in a minimum number of manufacturing steps. Preferably, action of a compound indenter causes deformation of the workpiece, causing dimples in the workpiece. By optimized use of the method, a relatively uniform beneficial residual stress profile is provided at both the surface and at the midplane apertures in a workpiece, so as to improve overall fatigue life. An improved, compound indenter tool profile shape is described, having a first, elongate indenter with a shaped indenter surface portion, and a second shaped indenter surrounding the first indenter and forming an annular shoulder recessed from the surface portion of the first indenter.

Abstract: A closed forging method for producing a forged product includes preparing as a forging material a cylindrical cast ingot that has a volume the same as the volume of a forged product and assumes a shape having an upper surface, a lower surface and a side surface and containing no angular portion; and applying pressure to the side surface of the forging material. The shape has a ratio of the lateral length of a projection profile of the forging material as viewed in the direction perpendicular to the direction of pressure application to a length of the forging material as measured in the direction of pressure application is 1 or less. The forged product obtained is a preform of an upper arm or a lower arm with a plurality of branches that is a suspension part for a vehicle or a yoke with a plurality of branches that is a joint part employed in a vehicle suspension. The preform or yoke has metal flow lines along each branch and exhibits enhanced mechanical strength.

Abstract: The invention relates to apparatus for enlarging part of a metal workpiece by cold forging, characterised by an enlarging die (5, 6) and by the die having means (8, 8′) to alleviate stress to the workpiece during forging.

Abstract: A reverse input blocking clutch comprises, as main elements, an input member, an output member, a stationary member for constraining the revolutions, locking means, lock release means and torque transmission means. By forming the input member, the output member, the stationary member and a fixed side plate from metal plates such as press worked steel plates, a compact, lightweight and low cost reverse input blocking clutch is provided. Reverse input torque from the output member is locked in both the forward and reverse rotational directions relative to the stationary member, by rollers which function as the locking means. Input torque from the input member in both the forward and reverse rotational directions is transmitted to the output member via apertures 1d and protrusions which function as the torque transmission means.

Abstract: This method refers to a method by which the physical and mechanical properties intrinsic to a fine-grain structure may be formed in metal billets using pressure treatment. The method is designed to treat rods, bars and other particularly long billets. This method is designed to lower the cost of deformational treatment for long rods and large diameter billets and creates a pre-specified microstructure, including micro-crystal structure, and specific physical and mechanical properties. This may be achieved using various treatment techniques, one of which includes the deformation of at least a part of the billet through reduction of the billets cross-section. In this method, a long rod shaped billet is used. Reduction of the cross-section is achieved using tools that permit movement along and across the billet's axis as well as being rolled about its surface, for example, a roller. In this case at least one support stand is employed for correct placement of the billet.

Abstract: Metal coldworking tooling and a method of employing such tooling. The tooling is used to produce deformation in a workpiece, preferably via use of stress waves, to provide a selected beneficial residual stress profile in the workpiece, in order to provide high fatigue life structures in a minimum number of manufacturing steps. Preferably, action of an indenter causes propagation of stress waves to coldwork a workpiece, causing dimples in the workpiece. Preferably, the dimples are provided with a shape formed by application of a uniform pressure profile to the workpiece surface. By optimized use of the method, a relatively uniform beneficial residual stress profile is provided at both the surface and at the midplane apertures in a workpiece, so as to improve overall fatigue life. An improved indenter tool profile shape is described, having a smoothly curved indenter surface portion.

Abstract: A process for making ratchet wheels includes a step of providing a work with a first end and a second end, a step of punching the work by means of a punch so as to define a large recess through the second end, a step of cutting away the first end of the work, a step of defining two annular grooves in a periphery of the work and a step of forming a plurality of teeth on the work. The process may include, before the step of cutting away the first end of the work, a step of punching the work in order to define a small recess with a diameter smaller than that of the large recess, a step of punching the work so as to define an opening with a diameter smaller than that of the small recess wherein the opening extends through the first end of the work. The process may include a step of defining a shallow recess in the second end of the work before the step of defining the large recess.

Abstract: A passive-adaptive indentor is provided for cold working a material that includes a material surface and a depth extending in a direction that is perpendicular to a direction of the material surface. The passive-adaptive indentor has a first member that includes a first working end that is configured to create a first residual stress field that extends to a predetermined depth in the material. The passive-adaptive indentor also has a second member that includes a second working end that is configured to create a second residual stress field that extends to a generally fixed second depth of the material regardless of the depth to which the first residual stress field extends. A method of using a passive-adaptive indentor for cold working a material is also presented.

Abstract: A golf club according to the present invention comprises a face portion (1) and a neck portion (2), and metal flow lines (3) continue from the face portion (1) to the neck portion (2). These metal flow lines (3) extend in a single direction on the face portion (1). A method of manufacturing a golf club according to the present invention comprises steps of bending a rod member subjected to drawing plastic working on an end and forging the rod member after the bending for integrally molding a face portion (1) and a neck portion (2).

Abstract: According to the invention, an inward collar is integrally shaped on the inner periphery of a cylindrical boss portion. The inward collar is raisedly shaped in the axial direction on the inner periphery of the cylindrical boss portion by a top pattern tool having an ironing punch, and a bottom pattern tool having an ironing punch. The ironing process of forming the inward collar is repeated several times by using plural dies to finish the final shape.

Abstract: Metal coldworking tooling and a method of employing such tooling. The tooling is used to produce deformation in a workpiece, preferably via use of stress waves, to provide a selected beneficial residual stress profile in the workpiece, in order to provide high fatigue life structures in a minimum number of manufacturing steps. Preferably, action of an indenter causes propagation of stress waves to coldwork a workpiece, causing dimples in the workpiece. Preferably, the dimples are provided with a shape formed by application of a pre-selected pressure profile to the workpiece surface. By optimized use of the method, a relatively uniform beneficial residual stress profile is provided at both the surface and at the midplane apertures in a workpiece, so as to improve overall fatigue life.

Abstract: A metallic separator according to a first embodiment is formed by obtaining a blank by rolling a metallic material having conductive inclusions, and removing a surface of the blank by 2% or more of the thickness of the blank. A metallic separator according to a second embodiment is formed by pressing a metallic plate so as to have a cross section including ridges and grooves alternatively, and removing parts of the ridged portions so as to make flattened surfaces. A metallic separator having conductive inclusions in its metal texture according to a third embodiment is formed by blasting a liquid containing two or more kinds of abrasives having different particle diameters to a blank after it has been rolled. A metallic separator having conductive inclusion in its metal texture according to a fourth embodiment is formed by blasting a passivation treatment liquid mixed with abrasives to the separator.

Abstract: Multi-gauge strips are mainly used as materials for terminals of lead frames, relays, connectors, etc. of power transistors. The objective of the present invention is to provide a method of producing multi gauge strips by means of forming copper, a copper alloy, or a metal strip which can undergo plastic work in such a manner that its two sides in the widthwise direction are thinner than the center portion. In order to achieve the objective therein, the present invention provides a method producing multi gauge strips, which comprises the following steps of forming a flat strip into semi circular and “U” shape into a flat sheet so that the center portion of the strip in the widthwise direction is thicker, and the two sides from the center are made comparatively thinner. In this manner, the present invention enables stretch forming with an ordinary press in the widthwise direction of a material, which is a rather difficult process even with high priced special purpose equipment of the prior art.

Abstract: Method and apparatus for diametrically expanding a desired part of a metal shaft which can be a rod or a pipe, wherein the apparatus includes a driving rotary section (4) and a driven rotary section (6) arranged at a predetermined distance (D), each of the rotary sections (4) and (6) including a holder for holding a work, a pressing device (8) for pressing the work held by the holders along the length of the apparatus, and a biasing device (7) for declining the axis of the work, so that the work held by the holders at the distance (D) is rotated around its axis, and one of the holders is forced by the pressing device toward the other to carry out the diametral expansion, and then the work is bent back and straightened up.

Abstract: A device for forming components from billets having a thickness profile which is essentially symmetric to the central plane of the billet, i.e., the billet contains a thickness transition on both sides, and wherein the thickness transitions on both sided of the billet are transferred to one side of the formed such that the side of the formed component is planar. The forming surface of the forming device which faces the side of the billet that has a thickness transition in the formed state of the billet has a shape is adapted to the thickness transition to be realized, and the forming surface of the forming device which faces the side of the billet that becomes planar in the formed state is planar. Due to these measures, it is possible to transfer the thickness transition that originally existed on both sides of the billet to one side of the billet in only one step.

Abstract: A method of and device for forming a tripode star for a tripode joint, which tripode star comprises an annular hub member and three arms which adjoin the hub member, extend radially relative to a longitudinal axis (A) and form faces of spherical portions each positioned circumferentially relative to arm axes (Z) of the arms, wherein, in a first production stage, the hub member and the three arms are preformed from a blank by means of a first tool divided in a plane (E1) containing the arm axes (Z) and wherein, in a second production stage, pairs of burr-free faces of spherical portions positioned opposite one another in the circumferential direction relative to the hub member (12) are formed on to the preformed arms by means of a second tool divided in planes extending through the longitudinal axis (A) of the hub member and through the arm axes (Z).

Abstract: A compromise rail is formed of a single length of stock rail. One end of the rail is forged over a distance of 19-48 inches to reduce the height of the forged portion, which is then machined to match the running rail to which that end is to be attached. The invention avoids the expense and inconvenience of flash butt welding a forged section to a uniform profile rail as is done in prior art compromise rails.

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: The method for manufacturing a metal material with an intermediate hollow and two solid end portions includes a step for preparing a first mold for manufacturing a roughly-shaped metal material with a first inner solid end hollow and a lengthwise intermediate hollow of a preset length. A conical portion is formed around am outer end hole of the mold. The outer conical end of the metal material is pressed in the intermediate hollow to form a second outer end portion of the metal material. Thus, a finished product of metal material with two solid end portions and an intermediate hollow is manufactured. Such a method can surely simplify the processes of manufacture, lowing the cost of production, and strengthening the integrated structure of products.

Abstract: A tool body is cold formed by inserting a blank into a die which defines a portion of the outer surface of the tool body after which a punch applies an impact to the blank causing the outer surface of the blank to conform to the contour defined by the die. The tool body has a tapered forward end, a central radial flange and a rearward cylindrical shank. To cold forge a fixed diameter in the central flange of the tool the forging die has a cylindrical portion having an inner diameter equal to the desired diameter of the flange, the die having an end to allow overfill to be released forward of the fixed diameter portion. Also, a shoulder is formed between the cylindrical shank and a frustoconical portion between the shank and rear surface of the flange. Finally, the shank has an elongate cylindrical hub to facilitate alignment of the tool.