Abstract: The invention relates to a tool for forming a drilled hole (B), comprising a shank that is rotatable or rotates about a tool axis (A), at least one first portion, which is rotatable or rotates about the tool axis (A), for producing and/or widening a drilled hole (B) by chip cutting, and a second portion, which rotates about the tool axis (A), for widening a drilled hole (B) without chip cutting, wherein the second portion is arranged behind the first portion in a direction of advance (V) of the tool. The invention additionally relates to a method for producing a drilled hole (B).

Abstract: A spinning forming method includes: preparing a plate including a back surface at which a ring-shaped projection is formed along an outer peripheral edge of the plate, a ratio of a thickness at a reference position of the plate to a thickness at a tip end of the projection being 0.7 or less, the reference position being a position where an inclination of a portion of the back surface which portion extends toward the tip end of the projection is 45° or more; rotating the plate; moving a processing tool outward in a radial direction from an inner side of the projection to a position above the projection while pressing the processing tool against a front surface of the plate that is rotating; and locally heating a portion of the plate against which portion the processing tool is pressed.

Abstract: A form-rolling device for processing a tubular member may include a shaft rotatable around a first axis, a first grooving portion that protrudes from an outer circumference of the shaft; a second grooving portion that is rotatable around a second axis parallel to the first axis; a flange-shaped tube-end positioning member that is attached to a position of the outer circumference of the shaft nearer to a base end than the first grooving portion, and a supporting member that supports an outer circumference of a ring member held on an outer circumference of the tubular member.

Abstract: The aspects of the present disclosure provide an apparatus for forming a metal strut mount having a C-shape cross-section and a pair of flanges extending therefrom and a method of forming a metal strut mount utilizing a rolling machine.

Abstract: A method and tool for calibrating an extruded tube for use in a manufacturing operation. According to the method, the tube is stretched while in a clamping tool by approximately 3%. The tool encloses the tube while a stretching mechanism is clamped to opposite longitudinal ends of the tube and applies a stretching force to opposite ends of the tube. The tool includes a clamping mechanism that clamps the tube into a cavity and a stretching mechanism with clamps that are attached to opposite longitudinal ends of the tube to calibrate the tube by longitudinally stretching the tube.

Abstract: The invention relates to a machine, in particular a machine tool (9) for deep rolling wheelset shafts (5) for rail vehicle wheelsets with a headstock (12) and a tailstock (13) which each have prick punch points (16) for holding a wheelset shaft (5) at its respective ends, a device (16, 18, 20, 21 and 22) for driving the wheelset shaft (5), as well as tools which can be moved in directions (z, x) on the machine tool (9) for deep rolling lengthwise sections (axle zones 1 to 4) of the wheelset shaft (5), and clamping and feed devices. The tools consist of several pairs of work rollers (14, 15, 23, 25, 24, 26), of which each pair is intended for deep rolling at least one axle zone (1, 2, 3, 4) of the wheelset shaft (5).

Abstract: A process of forming the wall of the mouth of a cylindrical, metal container or packaging from a tubular ring that may or may not be molded that has to accommodate a sealing lid equipped with an elastic seal secured by a vacuum created in the container is characterized essentially by the use of a single element, the head carrying out the deformation of the internal diameter of the container by expansion to produce a bead together and simultaneously with a contraction that produces shrinkage above the bead of the mouth, the head comprising an expansible stationary part and a moving part that turns around the stationary part, the parts of the head being coaxial, which has the effect of compressing the metal and hardening it by organizing the metal molecules under two simultaneous stresses, which hardens the packaging and allows it to withstand the vacuum applied thereto.

Abstract: A method of forming circumferential grooves in pipe elements using opposed rollers to cold work the pipe elements determines the diameter of the groove while the pipe element is rotated between the rollers. A device for executing the method uses the instantaneous determinations of the groove diameter in a feed-back loop to control the operation of the device and halt groove formation when the groove diameter is within a specified tolerance.

Abstract: A method and tool for producing a flow formed part are disclosed, wherein the tool has an annular array of spline forming recesses for producing a flow formed part having splines and machining and production costs are minimized and efficiency is maximized.

Abstract: Disclosed herein is an apparatus and method for forming a product having an asymmetric cross-section using a ring rolling process. The method of forming a product having an asymmetric cross-section uses a ring rolling process that uses a ring rolling apparatus, the ring rolling apparatus comprising: a main roll pressing a circumferential outer surface of a blank, a pressure roll pressing a circumferential inner surface of the blank, and a pair of axial rolls pressing upper and lower surfaces of the blank, wherein a protrusion provided on the pressure roll comes into contact with a depressed portion formed on the circumferential inner surface of the blank, and as a width of the blank varies, the pressure roll moves in a vertical direction.

Abstract: Disclosed herein is a method of manufacturing a flange for wind towers through a ring rolling process. The ring rolling process makes use of a ring rolling machine. The ring rolling machine includes a main roll which presses a circumferential outer surface of a blank, a pressure roll which presses a circumferential inner surface of the blank, and a pair of axial rolls which press upper and lower surfaces of the blank. The method includes expanding an inner diameter and outer diameter of the blank using the ring rolling machine, transferring the pressure roll vertically so that a protrusion provided on a circumferential outer surface of the pressure roll comes into contact with the circumferential inner surface of the blank, and forming a depression in the circumferential inner surface of the blank using the protrusion of the pressure roll.

Abstract: An apparatus includes a mandrel having a first end and a second end, the mandrel including a cavity formed therein, a pilot disposed in the cavity formed in the mandrel, a portion of the pilot extending outwardly from the first end of the mandrel, and an insert disposed in a channel formed in the mandrel and through an exterior surface of the mandrel, wherein a portion of the pilot abuts the insert and radial outward movement of the insert is caused by an axial movement of the pilot.

Abstract: A two-step method and apparatus therefor provide cost-effective processing of tube-necking spinning for Superconducting Radio Frequency (SRF) cavities. A metal tube as a work piece may be rotated round its longitudinal axis; the target shape is obtained gradually in two steps by driving specially profiled rollers along roller paths moving in radial and axial directions. Alternatively, the rollers may rotate around a stationary work piece. To spin one cell, in the first step, a primary forming roller moves along a roller path to form a partial necking shape; then, in a second step, a secondary forming roller moves along a roller path to continue necking processing; and finally, the full cell is formed. To spin multi-cells, this two-step method is repeated for each cell.

Abstract: Provided is a spinning method of reducing a diameter of a work piece pipe body with processing rollers disposed on an outer surface of the work piece pipe body, the processing rollers being configured to be relatively revolved around the work piece pipe body, wherein, when the processing rollers are axially reciprocated while being moved in a radius direction of the work piece pipe body, wherein the diameter reducing process with the processing rollers is performed under a state in which a wound body formed of an elastic sheet-like material is inserted as a core body into the inside of a portion of the work piece pipe body to be subjected to the diameter reducing processing.

Abstract: The invention relates to a method and a forming machine suitable for manufacturing a product having various diameters from a workpiece, such as a metal cylinder or plate, in which the workpiece is clamped down in a clamping device, the workpiece and a first tool are rotated about an axis of rotation relative to each other, the workpiece is deformed by means of said first tool by placing the tool into contact with the workpiece and moving the workpiece and/or the tool in a direction along the axis of rotation. At least a second tool is placed into contact with the workpiece at a position behind the first tool, seen in the working direction, and the workpiece is also deformed by means of said second tool. Thus, parts of the workpiece that have been deformed by the first tool are deformed by one or more subsequent tools practically immediately.

Abstract: A clamp for a disk rotation driving device has a centering hole which is fitted to an outer circumference of a centering projection of a hub of the disk rotation driving device. A clamping screw is screwed into an axial center of the hub whereby a fastening head of the clamping screw fastens the clamp to the hub and a contact portion of the clamp comes in contact with an information recordable magnetic disk attached to the hub and presses onto the disk in a rotation axis direction. The clamp includes a centering cylinder bent in an axial direction. The centering cylinder has a circumferential inner surface which defines the centering hole. The rounded section is provided along an edge of the centering hole and has a radius smaller than the thickness of the centering cylinder. The fastening surface is continuous to the rounded section.

Abstract: Disclosed herein is an apparatus and method for forming a product having an asymmetric cross-section using a ring rolling process. The method of forming a product having an asymmetric cross-section uses a ring rolling process that uses a ring rolling apparatus, the ring rolling apparatus comprising: a main roll pressing a circumferential outer surface of a blank, a pressure roll pressing a circumferential inner surface of the blank, and a pair of axial rolls pressing upper and lower surfaces of the blank, wherein a protrusion provided on the pressure roll comes into contact with a depressed portion formed on the circumferential inner surface of the blank, and as a width of the blank varies, the pressure roll moves in a vertical direction.

Abstract: A method of producing a seamless, tubular product includes centrifugally casting a corrosion resistant alloy into a tubular workpiece having an inner diameter and an outer diameter. The method then removes material from the inner diameter of the workpiece and subjects the workpiece to at least about a 25% wall reduction at a temperature below a recrystallization temperature of the workpiece using a metal forming process. The metal forming process includes radial forging, rolling, pilgering, and/or flowforming.

Abstract: A method and tool for producing a flow formed part are disclosed, wherein the tool has an annular array of spline forming recesses for producing a flow formed part having splines and machining and production costs are minimized and efficiency is maximized.

Abstract: The method includes providing a planar sheet part; forming the planar sheet part by drawing or conical spinning to the shape of a partially formed part made up of a plate and a provisional hollow portion extending from the plate with a revolution shape with respect to an axis perpendicular to the plate, and an end wall closing an end of the provisional hollow portion opposite to the plate; and elongating a section of the provisional hollow portion by cylindrical or conical spinning. The shock absorber is integral with a plate and an elongated hollow portion extending from the plate with a revolution shape. A section of the elongated hollow portion has a thickness that is thinner than the thickness of the plate.

Abstract: A closing machine includes left and right chuck spindles (20) for driving a work piece (9) to rotate, a chuck spindle moving device (30) which moves the respective chuck spindles (20) in a horizontal direction orthogonal to a rotary axis O20 thereof, and left and right slide stoppers (34) for restricting the movement of the chuck spindles (20). The work piece (9) is introduced into each chuck spindle (20), and the chuck spindle moving device (30) moves the respective chuck spindles (20) until the movement of the respective chuck spindles (20) is stopped by the respective slide stoppers (34). During a closing operation, the rotary axis O20 of the chuck spindle (20) and a rotary axis O4 of a die (4) are offset in the horizontal direction by an offset S.

Abstract: A hoop for securing a drum head to a drum, the hoop having a lower portion configured to mount the hoop to a shell of the drum and a flange formed in the lower portion of the hoop. The flange being configured to receive a tension control device for tuning the drum head. The hoop may also include an upper portion that is above and normal to the flange and an annular upper edge formed on the upper portion of the hoop that is rolled over and bent inward toward an inner peripheral surface of the hoop. The upper portion may be fixed to the inner peripheral surface of the hoop be welding or another method of fixing.

Abstract: A circular-shaping device for a rotating part, especially an exhaust housing of a turbo engine is disclosed. The device includes a lower unit with two shaping rollers mounted movably along an axis X1 and one shaping roller mounted movably along an axis Y1; an upper unit with two shaping rollers mounted movably along an axis X2 and one shaping roller mounted movably along an axis Y2; a turntable disposed between the lower unit and the upper unit; and a blocking device for the rotating part on the turntable.

Abstract: A method for manufacturing a cylindrical battery includes allowing a cylindrical battery case (5) with a bottom to contain an electrode plate group, carrying out a groove-forming processing on an outside periphery of an opening of the battery case, disposing a sealing plate in the opening of the battery case through a gasket, and crimping and sealing the end of the opening of the battery case.

Abstract: The invention relates to a method and a forming machine suitable for manufacturing a product having various diameters from a workpiece, such as a metal cylinder or plate, in which the workpiece is clamped down in a clamping device, the workpiece and a first tool are rotated about an axis of rotation relative to each other, the workpiece is deformed by means of said first tool by placing the tool into contact with the workpiece and moving the workpiece and/or the tool in a direction along the axis of rotation. At least a second tool is placed into contact with the workpiece at a position behind the first tool, seen in the working direction, and the workpiece is also deformed by means of said second tool. Thus, parts of the workpiece that have been deformed by the first tool are deformed by one or more subsequent tools practically immediately.

Abstract: A method for forming a part of deformed cross section with non-rotation symmetry on an end portion of a cylindrical workpiece. The method includes steps of performing a first relative motion of a roller against the workpiece toward its one open end, and performing a second relative motion of the roller against at least a part of outer peripheral surface of the end portion of the workpiece toward the inside thereof, while the roller is rotated relative to the workpiece by one rotation, in such a state as being held to be in contact with the end portion, in a plane which is perpendicular to the moving direction of the first relative motion, and which includes a position where the roller contacts the outer peripheral surface of the end portion, and performing a rotational motion of the roller relatively rotating around the workpiece, while performing the second relative motion, with the roller being held to be in contact with the outer peripheral surface of the end portion.

Abstract: The invention relates to a method for roughening the surface of a metal sheet used as electrode support in industrial electrochemical applications, and an electrode made by such method. Mechanical roughening is imparted by skin-passing the sheet between two rollers of a rolling mill, at least one of which is patterned according to a predetermined profile to be transferred by compression to the surface of the metal sheet.

Abstract: A plurality of intermediate cross sections and center points thereof are provided for a plurality of target processed portions from an unprocessed portion of a workpiece up to a final target processed portion. By adjusting a relative position between each intermediate cross section of the workpiece W and rollers 11, 12 revolving around the workpiece between neighboring intermediate cross sections, adjusting a revolution diameter of the roller and an angle of its revolution plane, mating the center point, diameter and inclined angle of the revolution plane inside of a revolving locus of the roller, with the center point, diameter and inclined angle of each intermediate cross section of the workpiece, and driving the roller and workpiece relatively to each other, with a part of outer peripheral surface of the roller being always in contact with an outer peripheral surface of the workpiece, a spinning process is performed to change the diameter of the portion to be processed of the workpiece.

Abstract: A closing machine (1) for closing a work piece (9) by pressing a rotating die (4) against the rotating work piece (9) comprises a die support shaft (41) that supports the die (4), which is disposed coaxially with the work piece (9), rotatably, a power transmission mechanism (401) which transmits the torque of a motor 46 to the die support shaft (41) and a one-way clutch (410) which blocks torque that is input into the power transmission mechanism (401) from the die support shaft (41). During a closing operation, the die (4) is pressed against the work piece (9) so as to contact the work piece (9) slidingly such that the die (4) rotates in accordance with the work piece (9), which rotates at a higher speed than the die (4).

Abstract: There is provided a group III nitride crystal growth method capable of obtaining a material which is a GaN substrate of low defect density capable of being used as a power semiconductor substrate and in which characteristics of n-type and p-type requested for formation of transistor or the like. A growth method of group III nitride crystals includes: forming a mixed melt containing at least group III element and a flux formed of at least one selected from the group consisting of-alkaline metal and alkaline earth metal, in a reaction vessel; and growing group III nitride crystals from the mixed melt and a substance containing at least nitrogen, wherein after immersing a plurality of seed crystal substrates placed in an upper part of the reaction vessel in which the mixed melt is formed, into the mixed melt to cause crystal growth, the plurality of seed crystal substrates are pulled up above the mixed melt.

Abstract: Thus, the present disclosure includes a method of producing a weight-optimized pneumatic tire rim having rotationally-symmetrically partially different wall thickness. The steps include: providing a tube section having a first wall thickness and two end sides; leveling the first wall thickness starting from the two end sides over a defined rotationally-symmetrical area thereby forming two flanks by precontouring, each of the flanks having a second wall thickness, and pushing tolerance-caused excess material of the flanks into a well base zone between the two flanks; and contouring the flanks by pressure rolling while drawing each of the flanks toward an end area of each of the flanks and reducing the thickness of each of the flanks partially differently to predetermined measurements. The present disclosure also includes a device to implement the method.

Abstract: A method of fabricating a component for a substrate processing chamber involves providing a preform having internal and external surfaces, and providing a mandrel having a textured surface with a pattern of textured features comprising protrusions and depressions. The internal surface of the preform component is contacted with the textured surface of mandrel, and a pressure is applied to the external surface of the preform. The pressure is sufficiently high to plastically deform the preform over the textured surface of the mandrel to form a component having a textured internal surface comprising the pattern of textured feature that are shaped and sized to adhere process residues generated in the processing of substrates.

Abstract: It is understood as being preferably intended for the manufacture of cans through spinning, molding the can bodies (1) in the most varied shapes, also enabling the attainment of deep necking or die-necking in the can bodies (1), it may be use for the several purposes, from food and beverage cans, to chemicals and others, and they may be manufactured in several materials such as tin foil, chromed sheet and black plate, using the spinning process molding the can bodies (1), being able to be used in several types of cans, from those which use metallic, plastic or mixed lids (compound plastic+metallic), clamped such as those using metallic, plastic or mixed (compound+metallic) lid system and undamped, provided with sealing gaskets and vacuum closure.

Abstract: A method for making a differential housing having a ring gear integrally formed therein includes the steps of providing a differential housing having an annular rim integrally preformed therein; supporting the differential housing between upper and lower halves of a rotatable holding tool such that the annular rim extends radially outwardly from the holding tool for movement therewith; providing a thickening tool having a tool surface engagable with the annular rim during rotation of the holding tool to form a thickened lip; and providing a gear forming tool engagable with the thickened lip during rotation of the holding tool, whereby a plurality of teeth are formed along the lip to form the ring gear.

Abstract: The invention relates to a vacuum-assisted method and a device for forming an essentially flat blank (12) of metal into a thin-walled, shell-type body (14), especially for performing the method in accordance with one of the preceding claims, that has a supporting structure (16) forming a mold chamber (18) that holds the blank (12) during increasing deformation into the thin-walled, shell-body (14), a device (20) allocated to the supporting structure (16) for clamping the blank (12) about its circumference (22) to the supporting structure (16), that seals the reverse face (24) of the blank (12) facing towards the mold chamber (18) against the front face (26) of the blank (12) facing away from the mold chamber (18), and a device (28) allocated to the mold chamber (18) that also communicates with the mold chamber (18) for applying a vacuum and evacuating the mold chamber (18), and at least one forming tool (50) applied to the front face (26) of the blank (12) is/are allocated to the supporting structure (16), an

Abstract: Method for shaping a rim of a three dimensionally arched sheet metal, wherein the sheet metal is placed on a female die provided with a chamfer which follows the contour of a peripheral edge of the rim, the rim spanning the chamfer, and a male roller die is rolled on the sheet metal following the course of the chamfer while being pressed against the rim, thereby plastically deforming the rim locally into the chamfer while advancing along the chamfer in rolling contact.

Abstract: A method for producing workpieces wherein a generally cylindrical preform (8) is formed by at least one pressure roller (7) into a finished workpiece (8.2). The method includes slidingly placing a portion of the preform (8) on at least a first mandrel (3, 4?) which is slidably mounted in parallel with the longitudinal axis (A) of the preform (8), aligning the mandrel (3, 4?) such that the surface (3b, 4b, 4b?) thereof disposed within the preform (8) substantially defines a negative profile of an inner surface to be formed in said preform (8), and performing a relative movement between the preform (8) and the pressure roller (7) in a direction parallel to the longitudinal axis (A) while pressing the pressure roller (7) against the preform (8) such that material of the preform (8) is displaced by the pressure roller (7) in such a way that the mandrel (3, 4?) is moved by the displaced material.

Abstract: An apparatus for rotating a container body that utilizes frictional forces rather than the engagement of gears to rotate the container body is provided. Such an apparatus may include a stationary housing and a turret rotating on a shaft proximate to the housing. The turret may have a plurality of pockets and a roller assembly disposed within each pocket. Each roller assembly may have a body portion and a drive roller portion. Each body portion may have a contact portion for contacting a container body received in a respective pocket. Each drive roller may be in contact with the housing such that as the turret rotates, friction between the drive rollers and the housing causes each roller assembly to rotate.

Abstract: When the necked portion is formed at the end of the pipe material by the spinning method, working rollers are restricted so as to return immediately before the pipe end instead of being allowed to axially move beyond the end of the working object pipe. The diameter reduction amount of the pipe end is set smaller than that of the most diameter reduced portion connecting to the pipe end. A protruding portion of so-called bellmouth shape is formed at the working end, thereby preventing generation of fractures originated from the working end of the base portion or the welded portion and generation of wrinkles during the spinning.

Abstract: Microsurgical probes having a distal tip with a flat outer surface and a flat inner surface, and methods of forming such probes, are disclosed.

Abstract: In a closing machine (1), an inner diameter chuck (8) that grips an inner peripheral surface of a work piece (9), a work piece (9) introducing device that moves the inner diameter chuck (8) in a Y axis direction of the work piece (9), and an introduction stopper (12) that projects onto an introduction path of the work piece (9) are used in such a manner that the inner diameter chuck (8) grips the inner peripheral surface of the work piece (9) while the work piece (9) abuts against the introduction stopper (12), the introduction stopper (12) is removed from the introduction path of the work piece (9), and the work piece (9) is introduced into an outer diameter chuck (7) by moving the inner diameter chuck (8) in the Y axis direction of the work piece (9).

Abstract: A closing machine (1) for closing a work piece (9) by pressing a rotating die (4) against the rotating work piece (9) comprises a die support shaft (41) that supports the die (4), which is disposed coaxially with the work piece (9), rotatably, a power transmission mechanism (401) which transmits the torque of a motor 46 to the die support shaft (41) and a one-way clutch (410) which blocks torque that is input into the power transmission mechanism (401) from the die support shaft (41). During a closing operation, the die (4) is pressed against the work piece (9) so as to contact the work piece (9) slidingly such that the die (4) rotates in accordance with the work piece (9), which rotates at a higher speed than the die (4).

Abstract: A plurality of intermediate cross sections and center points thereof are provided for a plurality of target processed portions from an unprocessed portion of a workpiece up to a final target processed portion. By adjusting a relative position between each intermediate cross section of the workpiece W and rollers 11, 12 revolving around the workpiece between neighboring intermediate cross sections, adjusting a revolution diameter of the roller and an angle of its revolution plane, mating the center point, diameter and inclined angle of the revolution plane inside of a revolving locus of the roller, with the center point, diameter and inclined angle of each intermediate cross section of the workpiece, and driving the roller and workpiece relatively to each other, with a part of outer peripheral surface of the roller being always in contact with an outer peripheral surface of the workpiece, a spinning process is performed to change the diameter of the portion to be processed of the workpiece.

Abstract: A method and a device for straightening out irregularities in a flange by pressing a roller against a first side of the flange while supporting an opposite side thereof to preserve the angle between the flange and the part when undergoing compression loading by way of the roller.

Abstract: This invention relates to a vibration isolating bushing, for example, built into a suspension system, an inside diameter of one edge (4) of an inner cylinder (1) being made larger than that of the other edge (6). The outside diameter of the thinner edge (4) is enlarged by applying pressure with a pressure forming jig (26) to the thicker edge surface (25), with the thinner edge surface (20) of the inner cylinder (1) abutted on a base (23). After completion of enlargement of the outside diameter of the thinner edge (4), the outside diameter of the thicker edge (6) is enlarged by further pressure with the pressure forming jig (26), this process thus capable of enlarging the outside diameter of both edges (4), (6) with one continuous working step.

Abstract: A method and apparatus (10) provide a flow formed part assembly (12) having mechanically interlocked first and second metallic parts (22) and (24).

Abstract: The present metal spin forming head includes two sets of rollers, with each set having a series of individual metal working rollers therein. The rollers of each set are circumferentially spaced evenly about the head, with each of the rollers of the second set being evenly positioned between corresponding rollers of the first set. The second roller set may be in a non-coplanar relationship with the first roller set. The first roller set comprises rollers having relatively broad widths, for forming the general contours of the workpiece. The second roller set comprises rollers having relatively narrow rims for forming circumferential grooves in the workpiece, resulting in corresponding beads within the workpiece for securing an article therein. The rollers are controlled independently of one another by a programmable logic control capable of driving the rollers cyclically as the workpiece (or spin forming head) rotates to form non-cylindrical shapes.

Abstract: A preparatory molding roll 4 having a convex push surface 41 is pushed to an outer peripheral surface of a work 1A while the work 1A is chucked by a pair of molds 2 and 3 and is rotated by applying axial propelling force, to bend inward the outer peripheral surface of the work in a radial direction. The work is then chucked by the preparatory molding roll and the upper and lower molds. Next, the preparatory molding roll is moved back and the work is crushed in the axial direction to form a bent portion 1a. A molding roll 5 is pushed to mold the outer shape of the work. A grooved roll 6 is next pushed to the outer peripheral surface of the work and a groove 1b is formed on the outer peripheral surface.

Abstract: A forming device having a rotating frame (1) and a forming blade (2) movable in the axial and radial directions of the rotating frame. One side-edge portion of a tubular blank (B) is fixed to a predetermined position of the rotating frame (1), and the other side-edge portion is movably set on the rotating frame. While the rotating frame (1) is rotated, the forming blade (2) is pressed to the inner diameter side or the outer diameter side of a peripheral wall of the tubular blank (B). The forming blade is reciprocated from the fixed side-edge portion radially outward or inward and moved toward the movable side-edge portion. Thus, a tubular formed body in which at least a ridge portion or a recess portion continuing in circumferential direction is shaped in the peripheral wall is formed.

Abstract: The invention relates to a method and a forming apparatus for deforming a hollow workpiece having at least one open end, wherein the workpiece is clamped down in a clamping device, a first forming tool is placed into contact with the outer surface of the workpiece, said workpiece and said tool are rotated about an axis of rotation relative to each other and said workpiece is deformed by means of said first tool. A second forming tool is placed into the cavity defined by the workpiece and into contact with the inner surface of the hollow workpiece, after which the workpiece is deformed by means of said second tool.