JP5707624B2 - Plastic working apparatus and plastic working method - Google Patents

Description

  The present invention includes a main shaft that is driven and rotated by a main shaft rotation axis, a mandrel that is provided at the tip of the main shaft and attaches a disk-shaped material, a clamping mechanism that clamps the disk-shaped material between the mandrel, and roller rotation A roller configured to be rotatable at the shaft center and pressing the outer diameter surface of the sandwiched disk-shaped material to plastically deform the disk-shaped material, and a direction in which the roller approaches or separates at least from the spindle rotation shaft The present invention relates to a plastic working device provided with a roller moving mechanism for moving the device and a control means for controlling operation, and a plastic working method used in the plastic working device.

  In such a plastic working apparatus, for example, as shown in FIG. 6, a cylindrical product having a substantially T-shaped portion 51 in a longitudinal sectional view is manufactured at the outer diameter side end portion using a disc-like material 50 as a starting material. In doing so, a tear roller 53 having a V-shaped machining surface 52 having a sharp tip in a sectional view including the roller rotation axis P, and a flat roller having a machining plane parallel to the roller rotation axis (FIG. (See, for example, Patent Document 1). That is, the disc-shaped material 50 clamped and fixed between the mandrel 54 and the pressing body 55 of the clamping mechanism is rotated together with the mandrel 54 and the pressing body 55 by the rotation of the main shaft, and the tear roller 53 is rotated. Is pressed against the outer diameter surface 50a, and the disk-shaped material 50 is split from the outer diameter surface 50a so as to be divided into V shapes. Subsequently, a flat roller is pressed from the outer diameter side of the disc-shaped material 50 toward the inner diameter side close to the spindle rotation axis Q to the divided both cleaved portions 56, and the both cleaved portions 56 are pressed against the mandrel. The plastic working is performed along the outer diameter surface 54 a of the pressing member 54 and the outer diameter surface 55 a of the pressing body 55. As a result, a cylindrical product is manufactured in which a substantially T-shaped portion 51 is formed in a longitudinal sectional view at the outer diameter side end of the disc-shaped material 50. In addition, a comb-tooth roller (not shown) is provided on the outer diameter side of the cylindrical substantially T-shaped portion 51 (both split portions 56 pressed by the mandrel 54 and the outer diameter surfaces 54a and 55a of the pressing body 55). By forming a plurality of V-grooves by pressing, a cylindrical pulley having V-grooves is manufactured.

  Moreover, in such a plastic working apparatus, although not shown in the drawings, for example, a cylindrical product (pulley) in which a plurality of curved pulley grooves are formed in the outer diameter side end portion in a longitudinal sectional view is manufactured using a disk-shaped material as a starting material. In order to do so, several types of tearing rollers having a V-shaped working surface with a sharp tip in a cross-sectional view including the roller rotation axis and several types of rollers having roundness with different curvature radii at the tip are provided. A V-shaped roller (for example, the radius of curvature of the tip portion is 4 mm) and several types of pulley groove forming rollers having irregularities corresponding to a plurality of curved pulley grooves were used (see, for example, Patent Document 2). That is, the disc-shaped material clamped and fixed between the mandrel and the pressing body of the clamping mechanism is rotated together with the mandrel and the pressing body by the rotation drive of the main shaft, and the tearing roller having different opening angles of the V-shaped work surface is provided. The disk-shaped material is sequentially pressed against the outer diameter surface of the disk-shaped material, and the disk-shaped material is split from the outer diameter surface so as to be divided into V shapes. Subsequently, a plurality of V-shaped forming rollers having rounded tip portions and different V-shaped opening angles are sequentially placed in contact with the cut portions of the disk-shaped material whose tip portions are divided into V-shapes. Press to sequentially increase the radius of the cut portion. Further, after that, a plurality of pulley groove forming rollers having irregularities corresponding to the curved pulley groove are sequentially pressed in a state where they are in contact with the outer diameter surface of the disk-shaped material whose radius of the cut portion is enlarged, and viewed in a longitudinal section. Thus, a cylindrical product (pulley) having a desired plurality of curved pulley grooves formed at the outer diameter side end is manufactured.

Japanese Patent Laid-Open No. 10-216881 JP-A-3-013422

  Here, in the plastic working apparatus disclosed in Patent Document 1, for example, as shown in FIG. 6, the outer diameter surface 50a of the disk-shaped material 50 is cleaved by the cleaving roller 53. The thicknesses of the both cleaved portions 56 that have been cleaved so as to be divided into letter shapes are each about one-half the thickness t of the disc-like material 50 before cleaving. Therefore, the cylindrical wall portion (both split portions 56) of the cylindrical product has to be a relatively thin and wide shape. However, from the viewpoint of securing the strength of the cylindrical wall portion and improving the degree of freedom in processing, the thickness of the cylindrical wall portion is set to be approximately one half of the thickness t of the disc-shaped material before tearing. It is desirable to form thicker (thickening).

  Moreover, in the plastic working apparatus described in Patent Document 2, a cylindrical product can be finally produced by performing a large number of processes using a large number of rollers. That is, first, the disc-shaped material is cleaved by the cleaving roller, and then only the cut portion of the cleaved disc-shaped material is expanded in diameter by the V-shaped forming roller, and further the cleaved disc By finally pressing the entire material with a pulley groove forming roller, the manufacture of the cylindrical product is finally completed. However, from the viewpoint of simplification of the apparatus and reduction in manufacturing cost, it is desired that the plastic working apparatus can be accurately formed into a desired shape by using fewer rollers and fewer processes.

  Here, from the viewpoint of simplification of the apparatus and reduction in manufacturing cost, the plastic processing apparatus disclosed in Patent Document 1 is a plane having a processing plane parallel to the roller rotation axis without using the tearing roller. It is conceivable to process a disk-shaped material into a cylindrical product in one step using only a roller. However, when the outer diameter side of the disk-shaped material is pressed only by the flat roller, as shown in FIG. 7, the substantially T-shaped portion 61 formed at the outer diameter side end of the disk-shaped material 60 is the circle. In some cases, the plate-shaped material 60 is molded in a state where the shape is different in the circumferential direction. That is, by pressing a flat roller (not shown), the outer diameter side of the disk-shaped material 60 is processed so as to extend in both directions (left and right directions in FIG. 7) along the main shaft rotation axis Q. Due to the influence of frictional resistance with the plate-like material 60, the pressing force of the flat roller, etc., the material constituting the disk-like material 60 extends at different rates in both directions due to buckling, and the extension portions 62 extend. The degree may be different in the circumferential direction of the disk-shaped material 60. In this case, the ends of both extended portions 62 of the substantially T-shaped portion 61 are curved so as to wave in the circumferential direction (see the solid line indicated by reference numeral 63 in FIG. 7), and a desired cylindrical product is accurately obtained. There is a problem that it becomes impossible. In addition, the thickness of both extended portions 62 of the substantially T-shaped portion 61 formed by pressing the outer diameter side of the disk-shaped material 60 with only a flat roller is the base end portion side and the distal end of each extended portion 62 In many cases, the thicknesses are different from each other on the portion side, and it is desired to obtain a desired cylindrical product accurately by minimizing the difference in thickness between the base end portion side and the distal end portion side as much as possible. .

  Although not shown, a concave groove that is recessed toward the roller rotation axis in a cross-sectional view including the roller rotation axis is formed on the processing surface of the flat roller, and the bottom surface of the flat groove of the flat roller forms a disk shape. While pressing the outer diameter surface of the material and extending the material in both directions along the spindle rotation axis in the groove, the extension in the direction is regulated by the side surface of the groove, thereby along the spindle rotation axis. Increase the thickness of both extended parts extending in both directions, and then press both extended parts with another flat roller to form a roughly T-shaped part at the outer diameter side end of the disk-shaped material It is also possible to do. However, if the disc-shaped material is pressed from the outer diameter side and regulated by the side surface of the groove, the frictional resistance between the disc-shaped material and the roller increases or the frictional resistance increases. Therefore, it is necessary to increase the pressing force by the roller, and an excessive load is applied to the disk-shaped material due to the pressing force of the roller, and the disk-shaped material may be buckled. In addition, due to the restriction by the side surface of the concave groove, after the material extending in both directions along the spindle rotation axis in the concave groove comes into contact with the side surface, the material is rolled into the spindle rotation axis side, and the material's crest is disc It may be formed on the inner peripheral surface of the shaped material on the main shaft rotation axis side. In these cases, there is a problem that a desired cylindrical product cannot be obtained accurately. The same problem occurs when the concave groove is formed of a curved surface that is recessed toward the roller rotation axis.

  The present invention has been made in view of such circumstances, and the purpose thereof is to form a thick T-shaped portion at the outer diameter side end of the disk-shaped material as much as possible to ensure strength and to process it. A plastic processing apparatus and a plastic processing method capable of simplifying the apparatus and reducing the manufacturing cost by accurately forming a desired shape with fewer rollers while improving the degree of freedom of the apparatus. It is to provide.

In order to achieve the above object, a plastic working apparatus according to the present invention includes a main shaft driven and rotated by a main shaft rotation axis, a mandrel provided at a tip of the main shaft, to which a disk-shaped material is attached, and the disk-shaped material. And a roller that is configured to be rotatable by a roller rotation axis and presses an outer diameter surface of the sandwiched disk-shaped material to plastically deform the disk-shaped material. And a plastic working device comprising: a roller moving mechanism that moves the roller in a direction toward or away from at least the spindle rotation axis; and a control unit that controls the operation.
The curved roller as the roller includes a processing surface that protrudes toward the disk-shaped material in a cross-sectional view including the roller rotation axis, and the curvature radius R is the thickness of the disk-shaped material on the processing surface. a tip arc portion that satisfies t ≦ R ≦ 10t with respect to t, and a pair of linear portions that are connected to both ends of the tip arc portion and extend tangentially from the both ends,
The flat roller as the roller is configured to have a processing plane that is a straight line parallel to the roller rotation axis in a sectional view including the roller rotation axis,
The control means controls the roller moving mechanism to move the curved roller from the outer diameter surface of the disk-shaped material in the inner diameter direction approaching the spindle rotation axis, and to move the outer diameter surface of the disk-shaped material. The circular arc portion on the processing surface of the curved roller is brought into contact with each other, and a part of the disc-shaped material is sequentially flowed to both end sides of the circular arc portion along the distal arc portion, A first plastic working step for plastically deforming the outer diameter side end of the plate-like material into a substantially Y shape in a longitudinal sectional view, and after the execution of the first plastic working step, the working plane of the flat roller is plastically deformed. A second plastic working step in which the outer diameter side end of the disk-shaped material is plastically deformed into a generally T-shape by pressing from the outer diameter side of the generally Y-shaped disk-shaped material to the inner diameter side. In a configuration that executes
In the direction along the roller rotation axis, the width of the arcuate end portion of the curved roller is a disc shape plastically deformed to the arcuate end portion and the approximate Y shape when the first plastic working step is completed. It is set to a width greater than the contact width with the material ,
The flat roller has a groove portion recessed on the roller rotation axis side on the processing plane, and the width of the groove portion is the outer diameter side end portion of the disk-shaped material plastically deformed into the substantially Y shape. The width is set larger than the width .

In order to achieve the above object, a plastic working method according to the present invention comprises a main shaft driven and rotated by a main shaft rotation axis, a mandrel provided at a tip of the main shaft, and a disc-shaped material being attached thereto, and the disc-shaped material And a roller that is configured to be rotatable by a roller rotation axis and presses an outer diameter surface of the sandwiched disk-shaped material to plastically deform the disk-shaped material. And a plastic processing method for a disk-shaped material using a roller moving mechanism that moves the roller in a direction toward or away from at least the main axis of rotation of the spindle.
A processing surface that protrudes toward the disc-shaped material in a cross-sectional view including the roller rotation axis is provided, and the processing surface has a radius of curvature R with respect to the thickness t of the disc-shaped material, t ≦ R ≦. A curved roller as the roller formed with a tip arc portion of 10t and a pair of linear portions connected to both ends of the tip arc portion and extending in a tangential direction from the both end portions;
Using a flat roller as the roller having a processing plane that is a straight line parallel to the roller rotation axis in a cross-sectional view including the roller rotation axis,
The curved roller is moved from the outer diameter surface of the disk-shaped material in the inner diameter direction approaching the spindle rotation axis, and the tip arc portion on the processing surface of the curved roller is moved to the outer diameter surface of the disk-shaped material. And a part of the disk-shaped material is sequentially flowed to both end sides of the circular arc portion along the tip arc portion, and the outer diameter side end portion of the disc-shaped material is viewed in a longitudinal section. The first plastic working step for plastically deforming into a substantially Y-shape, and after the execution of the first plastic working step, the work plane of the flat roller is made of the substantially Y-shaped disc-shaped material after the plastic deformation. In a configuration for performing a second plastic working step of pressing the outer diameter side end of the disk-shaped material into a substantially T-shape by pressing from the outer diameter side to the inner diameter side,
In the direction along the roller rotation axis, the width of the arcuate end portion of the curved roller is a disc shape plastically deformed to the arcuate end portion and the approximate Y shape when the first plastic working step is completed. It is set to a width greater than the contact width with the material ,
The flat roller has a groove portion recessed on the roller rotation axis side on the processing plane, and the width of the groove portion is the outer diameter side end portion of the disk-shaped material plastically deformed into the substantially Y shape. The width is set larger than the width .

  According to the characteristic configuration of the plastic working apparatus or the plastic working method, in the first plastic working step, the control means moves the curved roller in the inner diameter direction approaching the main axis of rotation, thereby rotating the disc-shaped material. The outer diameter surface of the disk-shaped material is plastically deformed into a substantially Y shape in a longitudinal sectional view, and the thickness of the pair of extending portions formed in the approximately Y shape is determined. The thickness is increased to be thicker than about half of the thickness t of the disk-shaped material before plastic working. Subsequently, in the second plastic working step, the control means moves the flat roller in the inner diameter direction approaching the main shaft rotation axis, so that the outer diameter side end is processed into a generally Y-shaped disk-shaped material. The outer diameter side end is plastically deformed into a substantially T shape in a longitudinal sectional view, and the thickness of the pair of extending portions formed in the approximate T shape is set to the approximate Y shape. The thickness is made thicker than the thickness of the pair of extending portions formed in the shape. Therefore, the control means sequentially executes the first plastic working step and the second plastic working step, thereby providing a cylindrical wall portion (a pair of pairs) that is thicker than about half of the thickness t of the disk-shaped material before the plastic working. A cylindrical product with an extended portion) can be produced. Further, in two processes using two rollers, it is possible to accurately manufacture a cylindrical product that does not cause buckling or scooping with a simple apparatus configuration.

In other words, the curved roller used in the first plastic working step has a processing surface that protrudes toward the disc-shaped material in a cross-sectional view including the roller rotation axis, and this processing surface has a radius of curvature R. a distal arcuate portion serving as t ≦ R ≦ 10t, and a pair of straight portions Ru extending tangentially from and connected to both ends of the distal arcuate portion the both end portions are formed with respect to a disc-shaped material having a thickness t .

The radius of curvature R of the tip arc portion is set to a relatively large value with respect to the thickness t of the disc-shaped material before plastic working. Basically, this tip arc portion is set to the outer diameter surface of the disc-like material. Even if it is brought into contact with and pressed, a disc-like material is formed in both directions along the main axis rotation axis with the contact portion as a base point without causing a cut portion that can be recognized with the naked eye at the contact portion. Can be made to flow. That is, the flow of the material extends from the contact portion in the state along the tip arc portion, and sequentially flows to both end portions of the tip arc portion.
At this time, the flowing material always flows while receiving a resistance force from the arcuate portion of the tip, that is, the plastic working is performed in a state where all of the leading end portion and the base end portion of the material are in contact with the surface of the tip arc portion of the curved roller. Since it progresses, the thickness of both extension parts will be gradually thickened. Further, the material that has reached the both ends of the distal arcuate portion, also sequentially flow in contact with the state in a pair of straight portions Ru extending tangentially from the connected and the both end portions to the end portions, even both in the straight portions The thickness of the extended portion is gradually increased. When the curved roller is pressed against the outer diameter surface of the disk-shaped material, a resistance force is received from the tip arc portion or straight portion of the curved roller, but the flow in the direction along the tip arc portion or straight portion is not Since it is not particularly regulated, it is possible to appropriately prevent buckling and wrinkling of the disk-shaped material while appropriately increasing the thickness. Accordingly, at the end on the outer diameter side of the disk-shaped material, a substantially Y-shaped portion including at least a pair of extending portions along the tip arc portion of the curved roller in the longitudinal sectional view is substantially in the circumferential direction. Further, each of the pair of extending portions in the substantially Y-shaped portion is formed to have the same shape, and the thickness of each of the pair of extending portions is thicker than about one half of the thickness t of the disk-shaped material before plastic deformation. The meat has been increased. That is, as in the prior art, the outer diameter surface of the disk-shaped material is simply cleaved so that the thickness of the pair of cleaved portions is about one-half of the thickness t of the disk-shaped material before cleaving. In contrast to this, in this feature configuration, the thickness of the pair of extending portions in the substantially Y-shaped portion can be reliably increased.

Incidentally, the curvature radius R of the tip arc of the curved roller and smaller than t against a disc-shaped material having a thickness t, undesirably not possible to obtain sufficient thickening effect and greater than 10t Then, similarly to the plastic processing using only the flat roller described in the prior art, the ends of the pair of extending portions of the approximately T-shaped portion are curved so as to wave in the circumferential direction, which is not preferable (see FIG. 7). For the same reason, it is more preferable that the radius of curvature R is t ≦ R ≦ 5t.

  Further, in the second plastic working step, the flat roller presses the tip end portions (outermost diameter portions) of the pair of extending portions in the substantially Y-shaped portion from the outer diameter side, so that the flat roller and the extending portion At the beginning of contact, contact is made with only a pair of tip portions. At this time, the material of each tip portion is pressed in the direction approaching the spindle rotation axis, and the branch portions of the pair of extending portions in the direction along the spindle rotation axis (contact in the first plastic working step) A resistance force is received from the flat roller in a direction approaching the base point). Accordingly, the tip portions of the pair of extending portions in the approximately Y-shaped portion are pressed until they are substantially parallel to the direction along the spindle rotation axis, so that the approximately Y-shaped portion becomes the approximately T-shaped portion. When the plastic working is performed, the thickness of the pair of extending portions is further increased. At this time, the thicknesses of the base end portion side and the tip end portion side of each extending portion are increased to be approximately equal. When the flat roller is pressed to the outer diameter side of the disk-shaped material, the contact area between the processing plane and the pair of extending portions is relatively small, although resistance force is received from the processing plane of the flat roller. For this reason, it is possible to appropriately prevent buckling and wrinkling of the disk-shaped material while appropriately increasing the thickness. Therefore, at the end on the outer diameter side of the disk-shaped material, in a longitudinal sectional view, a substantially T-shaped portion having a pair of extending portions shaped along the processing plane of the flat roller has substantially the same shape in the circumferential direction. Furthermore, the thickness of each of the pair of extending portions in the substantially T-shaped portion is sufficiently larger than about one half of the thickness t of the disk-shaped material before plastic deformation. Thickened and thickened.

  Therefore, when plastic processing a disk-shaped material into a cylindrical shape, the thickness of the approximate T-shaped portion of the outer diameter side end of the disk-shaped material is formed as thick as possible to ensure strength and freedom of processing. While improving the degree, it is possible to use a smaller number of rollers and accurately form a desired shape with fewer steps, thereby simplifying the apparatus and reducing the manufacturing cost.

In the first plastic working step, when plastic working is performed by bringing the tip arc portion of the curved roller into contact with the outer diameter surface of the disc-like material, the material constituting the disc-like material is always the tip arc portion. only sequentially flows to both ends of the distal arcuate portion along, that form a schematic Y-shaped portion with a pair of extending portions along the curvature of the distal arcuate portion. As a result, the pair of extending portions in the generally Y-shaped portion can be formed in a state having a relatively large height (distance in the direction approaching or separating from the spindle rotation axis), and the subsequent second In the two plastic working steps, the thickness of the pair of extending portions in the substantially T-shaped portion formed by the plastic working of the flat roller can be increased.

Block diagram showing the overall configuration of the plastic working machine (A) Longitudinal sectional view of a disk-shaped material before plastic working, (b) Plan view of the disk-shaped material (A) Schematic diagram showing the state where the curved roller is in the standby position, (b) Schematic diagram showing the state where the curved roller is in the machining completion position, (c) The curved roller is between the standby position and the machining completion position Enlarged schematic diagram showing the state, (d) Enlarged schematic diagram showing the state where the curved roller is at the processing completion position (A) Schematic showing the state where the flat roller is in the standby position, (b) Schematic showing the state where the flat roller is in the processing completion position (A) Schematic diagram showing a state in which the flat roller according to another embodiment is in the standby position, (b) Schematic diagram showing a state in which the flat roller according to another embodiment is in the processing completion position Schematic diagram showing a disk-shaped material that has been cleaved by a conventional plastic working device Schematic diagram showing a disk-shaped material plastically processed by a conventional plastic processing apparatus and having a substantially T-shaped cylindrical wall portion undulated in the circumferential direction.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the plastic working apparatus includes a main shaft 1 that is driven to rotate by a main shaft rotation axis A, a mandrel 2 that is provided at the tip of the main shaft 1 and attaches a disk-shaped material W, and a disk-shaped material W. The disc-shaped material W is made of plastic by pressing the outer diameter surface Wo of the clamped disc-shaped material W. A roller 3 to be deformed, a roller moving mechanism M that moves the roller 3 in a direction approaching or moving away from at least the main shaft rotation axis A, and a control unit 4 (control means) that controls operation are configured. .

As shown in FIGS. 2 and 3, the disk-shaped material W is a disk-shaped metal material having a predetermined thickness t in a longitudinal sectional view, and a through hole Wh is formed in the center portion in a plan view. Yes.
In the plastic working apparatus, as shown in FIGS. 1, 3, and 4, basically, the disk-shaped material W is brought into contact with the mandrel 2 on one side and the pressing body of the clamping mechanism S on the other side. In a state of being brought into contact with the mandrel 2, the mandrel 2 and the pressing body 5 are clamped and fixed, and the spindle 1 is rotated around the spindle rotation axis A together with the mandrel 2 and the pressing body 5 by the rotational drive. In this rotating state, the roller 3 presses the outer diameter surface Wo of the disk-shaped material W, so that the plastic processing is performed while the roller 3 rotates around the roller rotation axis B, and the disk-shaped material. A cylindrical product (for example, a semi-finished product of a clutch case) having a substantially T-shaped portion Wt at the outer diameter side end Wp of W is manufactured.

Hereinafter, the configuration of each part of the plastic working apparatus will be described.
As shown in FIG. 1, the axial direction of the main shaft 1 along the main shaft rotation axis A is referred to as the Z direction, and the direction perpendicular to the main shaft rotation axis A, that is, the main shaft rotation axis A is approached. Or the radial direction which separates may be described as a X direction. In the Z direction, the direction in which the roller 3 approaches the base end of the main shaft 1 (the end connected to the rotational drive device 6 described later) is defined as the −Z direction, and the direction away from the base end of the main shaft 1 is the + Z direction. The direction. In the X direction, the direction in which the roller 3 approaches the spindle rotation axis A is defined as the -X direction, and the direction away from the spindle rotation axis A is defined as the + X direction.

  As shown in FIG. 1, a gantry (see FIG. 1) is arranged so that a rotary drive device 6 such as an electric motor is rotationally driven around a spindle rotation axis A in a state where the rotary drive apparatus 6 is transmission-coupled to the base end side of the spindle 1. (Not shown). A mandrel 2 is replaceably attached to the tip of the main shaft 1. A cylindrical protrusion 2a that can be inserted into a through-hole Wh formed in the center of the disc-shaped material W is provided on a surface of the outer surface of the mandrel 2 that faces the pressing body 5 of the clamping mechanism S. It protrudes in a concentric state with the heart A. Accordingly, in the state where the cylindrical protrusion 2a of the mandrel 2 is inserted into the through hole Wh of the disk-shaped material W and one surface of the disk-shaped material W is in contact with the tip surface of the mandrel 2, the disk The material W is attached to the mandrel 2.

The clamping mechanism S is configured to include an actuator (not shown) such as a hydraulic cylinder that drives the pressing body 5 to reciprocate along the spindle rotation axis A so that the pressing body 5 is positioned to face the mandrel 2. It is arranged. The pressing body 5 is rotatably supported via a bearing or the like so as to be rotatable concentrically with the spindle rotation axis A. A hole 5 a that can accommodate the cylindrical protrusion 2 a of the mandrel 2 is formed on the outer surface of the pressing body 5 that faces the mandrel 2. Therefore, by operating the actuator so as to press the pressing body 5 against the other surface of the disk-shaped material W mounted on the mandrel 2, the disk-shaped material W is sandwiched between the mandrel 2 and the pressing body 5. It is configured.
The main shaft 1 is rotationally driven by the rotation driving device 6 so that the disk-shaped material W is rotated together with the mandrel 2 and the pressing body 5 while being sandwiched between the mandrel 2 and the pressing body 5. Has been.

Further, the plastic working apparatus includes an X-direction moving means Mx (roller moving mechanism) capable of moving the roller 3 in a direction (X direction) orthogonal to the main shaft rotation axis A, and a direction along the main shaft rotation axis A (Z Z direction moving means Mz (roller moving mechanism) capable of moving the roller 3 in the direction) is provided.
Specifically, the X-direction moving means Mx is provided with a Z-direction guide rail 8 that supports the moving table 7 so as to be reciprocally movable in the Z direction, and further, a Z-direction screw shaft 9 screwed into the moving table 7. A Z-direction drive device 10 such as a pulse motor that reciprocally moves the movable base 7 in the Z direction by rotating the forward and reverse directions is provided. The Z-direction moving means Mz is supported on the moving table 7 and is screwed into the turret table 11 so as to support the turret table 11 supporting the roller 3 so as to reciprocate in the X direction. An X-direction drive device 14 such as a pulse motor that reciprocally moves the turret base 11 in the X direction by rotating the X-direction screw shaft 13 forward and backward is provided.

  The turret base 11 is provided with a curved roller 3A and a flat roller 3B as two types of rollers 3 with different types of processing applied to the disk-shaped material W. The curved roller 3A is around the curved roller rotation axis B1. Similarly, the flat roller 3B is supported rotatably around the flat roller rotation axis B2. Further, the turret base 11 can press the curved roller 3A to the mandrel 2 side so that the curved roller 3A can be pressed to the disk-shaped material W, and the flat roller 3B to press the disk-shaped material W. It is configured to be rotatable to a second machining position that protrudes toward the mandrel 2. The curved surface roller rotation axis B1 of the curved surface roller 3A at the first processing position is configured to be parallel to the main shaft rotation axis A, and similarly, the flat roller rotation of the flat roller 3B at the second processing position is made. The axis B2 and the spindle rotation axis A are configured to be parallel.

As shown in FIG. 3, the curved roller 3 </ b> A includes a processing surface 20 that protrudes toward the disc-shaped material W in a cross-sectional view including the curved roller rotation axis B <b> 1. The processed surface 20 has a tip arc portion 21 in which the radius of curvature R is t ≦ R ≦ 10t with respect to the thickness t of the disk-shaped material W, and a pair of linear portions connected to both end portions 21a of the tip arc portion 21. 22 is formed. The curved roller 3A is plastically processed by pressing the outer diameter surface Wo of the disk-shaped material W along the X direction in a first plastic processing step to be described later, and the outer diameter side of the disk-shaped material W. The roller 3 forms a substantially Y-shaped portion Wy at an end Wp. The processed surface 20 of the curved roller 3A is formed to be a line object with respect to a straight line including the center point O of the tip arc portion 21 and orthogonal to the curved roller rotational axis B1.

  The radius of curvature R of the tip arc portion 21 is set to a relatively large value with respect to the thickness t of the disc-like material W before plastic working. Basically, the tip arc portion 21 is set to the disc-like material W. Even if the outer surface Wo is brought into contact with the outer diameter surface Wo and pressed along the X direction, there is almost no cut portion that can be recognized by the naked eye at the contact portion, and the spindle rotation shaft with the contact portion as a base point U. The material constituting the disc-shaped material W can be made to flow in both directions (+ Z direction and −Z direction) along the center A. Actually, as will be described later, the flowing material flows in both directions (+ Z direction and −Z direction) along the spindle rotation axis A, and ends from the base point U along the tip arc portion 21 of the curved roller 3A. It flows in the direction of the portion 21a (see FIGS. 3C and 3D).

Incidentally, the curvature radius R of the tip arc portion 21 of the curved roller 3A, when less than t the thickness t of the disc-shaped material W, undesirably not possible to obtain sufficient thickening effect and, 10t If it is larger than that, the tip ends of the pair of extended portions of the substantially T-shaped portion are curved so as to be undulated in the circumferential direction, as in the case of plastic processing using only the flat roller described in the prior art. For the same reason, it is more preferable that the radius of curvature R is t ≦ R ≦ 5t. 3 shows an example in which the radius of curvature R of the tip arc portion 21 is 30 mm, the center angle r is 100 °, and the thickness t of the disk-shaped material W is 8 mm.

Further, the tip arc portion 21 of the present embodiment has a width L (a distance L between 21a and 21a in FIG. 3C) of the tip arc portion 21 of the curved roller 3A in the direction along the curved roller rotational axis B1. The contact width between the tip arc portion 21 and the disk-shaped material W plastically deformed into the substantially Y-shaped portion Wy at the completion of the first plastic working step is set to an equivalent width. That is, the material that flows in the plastic processing of the disk-shaped material W by the curved roller 3A flows only along the tip arc portion 21, and when the base point U reaches both ends 21a, the formation of the substantially Y-shaped portion Wy is completed. As described above, the width L of the tip arc portion 21 is set. The width of the tip arc portion 21 can be set by appropriately adjusting the radius of curvature R and the center angle r of the tip arc portion 21. The central angle r may be 180 ° or less, and may be 120 ° or less in order to prevent buckling at both ends, for example.
Further, each of the straight portions 22 is formed so as to extend in a tangential direction from both end portions 21 a of the tip arc portion 21. In the present embodiment, when the material flowing by the plastic working by the curved roller 3A reaches the both end portions 21a of the tip arc portion 21, the formation of the substantially Y-shaped portion Wy is completed. The material is configured not to flow.

  As shown in FIGS. 1 and 4, the flat roller 3 </ b> B includes a processing plane 30 that is a straight line parallel to the flat roller rotation axis B <b> 2 in a cross-sectional view including the flat roller rotation axis B <b> 2. This flat roller 3B is formed on the outer diameter side (a pair of extended portions) of both extended portions W1 in the substantially Y-shaped portion Wy formed by plastic processing in the first plastic processing step in the second plastic processing step described later. This is a roller 3 that plastically processes the outer diameter side of the front end Wd of W1 and plastically processes the approximately Y-shaped portion Wy into an approximately T-shaped portion Wt.

  The control unit 4 is a known information processing unit including a CPU and the like, and is configured to be able to control the operation / operation of each unit of the plastic working apparatus. For example, the control unit 4 controls the rotation of the turret base 7 and the amount of movement in the X direction or the Z direction, the control of the pressing force with which the roller 3 presses the outer diameter surface Wo of the disk-shaped material W, the spindle 1 The operation of the rotary drive device 6 for driving and rotating is controlled.

Next, a plastic working method for the disk-shaped material W will be described.
In the plastic working method of the present invention, as shown in FIGS. 1, 3, and 4, the curved roller 3 </ b> A is moved in a state where the disk-shaped material W rotates around the spindle rotation axis A together with the mandrel 2 and the pressing body 5. The first plastic working step of pressing the outer diameter surface Wo is performed by moving from the position separated from the outer diameter surface Wo of the disk-shaped material W in the X direction to the side approaching the spindle rotation axis A, and thereafter The curved roller 3A is switched to the flat roller 3B, and the flat roller 3B is moved from the position away from the outer diameter side of the disk-shaped material W in the X direction to the side closer to the spindle rotation axis A, and the outer diameter is changed. A second plastic working step of pressing the side is executed.

  First, when the disk-shaped material W is mounted on the mandrel 2, an operation start command is commanded to the control unit 4. When the disk-shaped material W is manually mounted on the mandrel 2, an operation start command is issued by an operator operating an operation start button (not shown), and the disk-shaped material W is automatically conveyed. In this case, the operation start command is issued by the automatic transfer device.

  When the operation start command is instructed, the control unit 4 operates the actuator so as to press the pressing body 5 against the other surface of the disk-shaped material W mounted on the mandrel 2. As a result, the disk-shaped material W is sandwiched between the mandrel 2 and the pressing body 5. And the control part 4 operates the rotational drive apparatus 6 with the preset rotational speed set beforehand. Thereby, the mandrel 2, the disk-shaped material W, and the pressing body 5 rotate together.

Then, the first plastic working step is executed.
Specifically, as shown in FIG. 3A, the control unit 4 operates the X-direction moving unit Mx and the Z-direction moving unit Mz to move the curved roller 3A in the Z direction. The center point O of the tip arc portion 21 is positioned on the extension of the intermediate line of the thickness t of the disc-shaped material W, and the tip end of the tip arc portion 21 is the outer diameter surface Wo of the disc-like material W in the X direction. It is arranged at a standby position that is close to the position. In this state, the turret base 11 is in a state where the curved roller 3A is positioned at the first processing position where the curved roller 3A protrudes toward the mandrel 2 side.

  Subsequently, as shown in FIGS. 3B to 3D, the control unit 4 operates the X-direction moving unit Mx to move the curved roller 3 </ b> A from the standby position along the X direction to the main shaft rotation axis A. To the side approaching (−X direction side) to a preset position in the X direction (hereinafter sometimes referred to as a processing completion position). The position in the X direction of the curved roller 3A shown in FIGS. 3B and 3D is the processing completion position.

  Then, since the tip arc portion 21 of the curved roller 3A moves to the processing completion position while pressing the outer diameter surface Wo of the disc-like material W, the material of the disc-like material W is separated from the tip arc portion 21 and the outside. It flows in both directions (+ Z direction, −Z direction) along the tip arc portion 21 from the first contact portion (base point U) with the radial surface Wo. That is, as shown in FIG. 3C, the flow of the material extends in the state along the tip arc portion 21 with the contact portion as a base point U, and sequentially toward the both end portions 21 a of the tip arc portion 21. To flow. In the contact portion (base point U), both extending portions W1 are formed in the direction of both end portions 21a in a state where there is almost no cut portion that can be recognized with the naked eye.

  At this time, the flowing material always flows while receiving a resistance force from the distal end arc portion 21, that is, a state where all of the proximal end portion from the distal end portion Wd of the material contacts the surface of the distal end arc portion 21 of the curved roller 3 </ b> A. Since the plastic working proceeds, the thickness of both extended portions W1 is gradually increased. When the curved roller 3A is pressed against the outer diameter surface Wo of the disk-shaped material W, although it receives a resistance force from the tip arc portion 21 of the curved roller 3A, the flow along the tip arc portion 21 does not flow. Since it is not particularly regulated, it is possible to appropriately prevent buckling and creasing of the disk-shaped material W while performing an appropriate thickness increase. Therefore, as shown in FIG. 3 (d), a pair of extending portions having a shape along at least the tip arc portion 21 of the curved roller 3A in the longitudinal cross-sectional view is provided at the outer diameter side end portion Wp of the disk-shaped material W. The substantially Y-shaped portion Wy including the portion W1 is formed to have substantially the same shape in the circumferential direction, and the thickness of each of the pair of extending portions W1 in the approximately Y-shaped portion Wy is plastically deformed. The thickness is increased to be thicker than about half of the thickness t of the previous disk-shaped material W. That is, as in the prior art, the outer diameter surface Wo of the disk-shaped material W is simply cleaved so that the thickness of the pair of cleaved portions is about 2 of the thickness t of the disk-shaped material W before being cleaved. In contrast to the one-half (see FIG. 6), in the plastic working device of the present invention, the pair of extending portions W1 in the substantially Y-shaped portion Wy can be reliably formed thick (FIG. 3). (See (d)).

  Specifically, as shown in FIG. 3 (d), in the extended portion W1 of the substantially Y-shaped portion Wy, the proximal end side thickness t1 is 5.7 mm, and the distal end side thickness t2 is It is 4.4 mm, and it can be seen that the thickness is increased as compared with a thickness (4 mm) that is a half of the thickness t (8 mm) of the disk-shaped material W before plastic working. Note that the width (Z direction) of the substantially Y-shaped portion Wy and the thickness of the extended portion W1 can be controlled to some extent by the relationship between the rotational speed of the disk-shaped material W and the feeding (moving) speed of the curved roller 3A. .

Next, a second plastic working step is executed.
After the first plastic working step is completed and the substantially Y-shaped portion Wy is formed at the outer diameter side end Wp of the disk-shaped material W, the X-direction moving means Mx is operated to move the curved roller 3A to X It moves to the side (+ X direction side) which is separated from the spindle rotation axis A along the direction, and is positioned at the standby position. Then, the turret base 11 is rotated by 90 ° so that the flat roller 3B is positioned at the second processing position protruding from the first processing position to the mandrel 2 side, and the flat roller 3B is positioned at the standby position (FIG. 4 (a)).

  Subsequently, as shown in FIGS. 4A and 4B, the control unit 4 operates the X-direction moving unit Mx to move the flat roller 3 </ b> B from the standby position along the X direction to the main shaft rotation axis A. To the position approaching (−X direction side) to a preset position in the X direction (processing completion position). Note that the position in the X direction of the flat roller 3B shown in FIG. 4B is the processing completion position, and is set to the same position as the processing completion position of the curved roller 3A.

  Then, the processing plane 30 of the flat roller 3 </ b> B is the tip end portion Wd (outermost diameter) of the pair of extending portions W <b> 1 in the substantially Y-shaped portion Wy formed on the outer diameter side end portion Wp of the disk-shaped material W. Part) from the outer diameter side (from the + X direction side to the −X direction side). Thereby, the flat roller 3B and the extending portion W1 are in contact with each other only at the pair of tip portions Wd, and the material of each tip portion Wd is in a direction (−X direction) approaching the spindle rotation axis A. While being pressed, each tip portion Wd of the pair of extending portions W1 in the approximately Y-shaped portion Wy is pressed until it is substantially parallel to the direction along the spindle rotation axis A, and the approximately Y-shaped portion Wy is approximately T. Plastic processing is performed to form a letter-shaped portion Wt.

  At this time, the material of each distal end portion Wd approaches the branching portion of the pair of extending portions W1 in the direction along the spindle rotation axis A (the base point U which is the contact portion in the first plastic working step). 2 receives a resistance force from the flat roller 3B. Therefore, the thickness of the pair of extending portions W2 formed in the substantially T-shaped portion Wt is further increased. At this time, the thicknesses of the extended portion W2 on the base end portion side and the distal end portion side are increased to be approximately equal. When the flat roller 3B is pressed to the outer diameter side of the disk-shaped material W, although it receives a resistance force from the processing plane 30 of the flat roller 3B, the processing plane 30 and the pair of extending portions W1 Since the contact area is relatively small, it is possible to appropriately prevent buckling and creasing of the disk-shaped material W while performing appropriate thickness increase. Accordingly, the outer diameter side end portion Wp of the disk-shaped material W has a substantially T-shaped portion Wt including a pair of extending portions W2 having a shape along the processing plane 30 of the flat roller 3B in a longitudinal sectional view. Further, each of the pair of extending portions W2 in the substantially T-shaped portion Wt is approximately 2 times the thickness t of the disk-shaped material before plastic deformation. It is thickened sufficiently thicker than a minute.

  In particular, in the first plastic working step, when plastic working is performed by bringing the tip arc portion 21 of the curved roller 3A into contact with the outer diameter surface Wo of the disk-shaped material W, the material constituting the disk-shaped material W is changed. The generally Y-shaped portion Wy having a pair of extending portions W1 that always flow sequentially toward the both end portions 21a of the tip arc portion 21 only along the tip arc portion 21 and that always follows the curvature of the tip arc portion 21. Is formed. Thereby, the pair of extended portions W1 in the substantially Y-shaped portion Wy can be formed in a state of having a relatively large height (distance in the direction approaching or separating from the spindle rotation axis A), The thickness of the pair of extending portions W2 in the substantially T-shaped portion Wt formed by plastic processing of the flat roller 3B in the subsequent second plastic processing step can be formed to be thicker.

  Specifically, as shown in FIG. 4B, in the extended portion W2 of the substantially T-shaped portion Wt, the thickness t3 on the proximal end side is 6.7 mm, and the thickness t4 on the distal end side is It is 6.0 mm, and it can be seen that the thickness is further increased compared to the thickness (4 mm) that is a half of the thickness t (8 mm) of the disk-shaped material W before plastic working. In addition, the thickness t3 on the proximal end side and the thickness t4 on the distal end side of each extending portion W2 are increased to be nearly equal. Furthermore, the thickness on the base end side in the extended portion W2 of the general T-shaped portion Wt is larger than the thickness t1 on the base end portion side and the thickness t2 on the distal end portion side of the extended portion W1 in the general Y-shaped portion Wy. It can be seen that the thickness of t3 and the thickness t4 on the tip end side is increased. The width (Z direction) of the general T-shaped portion Wt and the thickness of the extended portion W2 can be controlled to some extent by the relationship between the rotational speed of the disk-shaped material W and the feed (moving) speed of the flat roller 3B. .

  Therefore, when the disk-shaped material W is plastically processed into a cylindrical shape, the thickness of the substantially T-shaped portion Wt of the outer diameter side end Wp of the disk-shaped material W is formed as thick as possible to ensure strength. In addition, the number of rollers 3 can be reduced and the desired shape can be accurately formed with fewer steps while improving the degree of freedom of processing, thereby simplifying the apparatus and reducing the manufacturing cost.

[Another embodiment]
(1) In the above-described embodiment, the processing plane 30 of the flat roller 3B is configured by a processing surface that is a straight line parallel to the flat roller rotation axis B2. However, the present invention is not limited to this configuration. It is also possible to employ a roller in which a groove that is recessed toward the flat roller rotation axis B2 side is formed on the processing plane 30 in a sectional view including the rotation axis B2.
For example, as shown in FIG. 5, a flat roller 3 </ b> C in which a rectangular groove 31 is formed as a groove formed on the processing plane 30 can be employed. The groove portion 31 is formed with a pair of side surfaces 31b orthogonal to a bottom surface 31a parallel to the flat roller rotation axis B2. The width in the Z direction of the groove 31 is set to be slightly larger than the width in the Z direction of the substantially Y-shaped portion Wy formed in the first plastic working step.
The second plastic working process using the flat roller 3C will be briefly described. As shown in FIGS. 5A and 5B, the control unit 4 operates the X-direction moving unit Mx to start from the standby position. Then, the flat roller 3C is moved along the X direction to the side (−X direction side) approaching the spindle rotation axis A to a preset position in the X direction (processing completion position). Then, in the state where the bottom surface 31a of the groove 31 in the processing plane 30 of the flat roller 3C is in contact with the pair of tip portions Wd, the material of each tip portion Wd approaches the spindle rotation axis A (−X direction). At the same time, the flow of the tip portions Wd extended in the direction along the spindle rotation axis A by the pressing is restricted by the pair of side surfaces 31b of the groove portion 31, while the pair of extended portions W1 are formed. It is pressed until it becomes substantially parallel, and plastic processing is performed so that the substantially Y-shaped portion Wy becomes a substantially T-shaped portion Wt. The thicknesses of the base end portion side and the tip end portion side of each extending portion W2 of the substantially T-shaped portion Wt are increased to be equal.
Therefore, according to this another embodiment, the substantially T-shaped portion Wt including a pair of thickened extended portions W2 is formed, compared to the case where the generally T-shaped portion Wt is formed in the above-described embodiment. It becomes possible.

(2) In the above embodiment, the width L of the tip arc portion 21 in the Z direction is substantially equal to the contact width between the substantially Y-shaped portion Wy formed by the first plastic working step and the tip arc portion 21. but the width of the tip arcuate portion 21, may also be set greatly than the abutting width.
For example, when the width of the tip arc portion 21 is larger than the abutting width is in the first plastic working step, the plastic working a disk-like material W to the processing completion position in the X direction, a pair of extension The protruding portion W1 is formed so as to extend along only the tip arc portion 21 until reaching both end portions 21a along the tip arc portion 21. In this case, similarly to the above-described embodiment, it is possible to form a substantially Y-shaped portion Wy including a pair of extending portions W1 along the curvature of the tip arc portion 21, and a pair of the approximately Y-shaped portions Wy. The extending portion W1 can be formed in a state of having a relatively large height (a distance in a direction approaching or separating from the main shaft rotation axis A).

(3) In the above embodiment, the position in the X direction of the processing completion position in the first plastic processing step and the processing completion position in the second plastic processing step is described as the same position, but both positions may be different. . For example, the processing completion position in the first plastic processing step can be set to be positioned in the + X direction with respect to the processing completion position in the second plastic processing step.

(4) In the above-described embodiment, the curved roller 3A and the flat roller 3B are switched by rotating the turret base 11. However, the curved roller 3A and the flat roller 3B can be individually processed. If there is, it is not particularly limited to this configuration. For example, the curved roller 3 </ b> A and the flat roller 3 </ b> B may be distributed in the circumferential direction around the main shaft rotation axis A and sequentially pressed from the outer diameter side of the disk-shaped material W. In this case, the X-direction moving means Mx and the Z-direction moving means Mz are provided for the curved roller 3A and the flat roller 3B, respectively.

(5) When the mandrel 2 is rotationally driven by the rotary drive device 6, the orientation of the spindle rotation axis A can be set in various directions such as the horizontal direction and the vertical direction.

  As described above, the thickness of the substantially T-shaped portion of the outer diameter side end of the disk-shaped material is made as thick as possible to reduce the strength while securing the strength and improving the freedom of processing. Thus, it is possible to provide a plastic working apparatus and a plastic working method that can be accurately formed into a desired shape with fewer steps to simplify the apparatus and reduce the manufacturing cost.

1 Spindle 2 Mandrel 3 Roller 3A Curved Roller (Roller)
3B Flat roller (roller)
4 Control unit (control means)
20 Machining surface (curved surface roller)
21 Arc at tip (machined surface)
21a End (tip arc)
22 Straight section (machined surface)
30 Processing plane (Flat roller)
S clamping mechanism Mx X direction moving means (roller moving mechanism)
Mz Z direction moving means (roller moving mechanism)
A Spindle rotation center B1 Curved roller rotation center (roller rotation center)
B2 Flat roller rotation axis (roller rotation axis)
W Disc material Wo Outer surface (disc material)
Wp Outer diameter side end (disk material)
Wy Approximate Y-shaped part Wt Approximate T-shaped part Wd Tip part t Thickness of disk-shaped material R Curvature radius L Width of tip arc part in the direction along the roller rotation axis

Claims (2)

A main shaft driven and rotated by a main shaft rotation axis, a mandrel provided at a tip of the main shaft, to which a disk-shaped material is attached, a clamping mechanism for clamping the disk-shaped material between the mandrel, and a roller rotation shaft A roller configured to be rotatable at a center and pressing the outer diameter surface of the sandwiched disk-shaped material to plastically deform the disk-shaped material; and at least the roller approaches or close to the spindle rotation axis A plastic working device comprising a roller moving mechanism for moving in a separating direction and a control means for controlling operation,
The curved roller as the roller includes a processing surface that protrudes toward the disk-shaped material in a cross-sectional view including the roller rotation axis, and the curvature radius R is the thickness of the disk-shaped material on the processing surface. a tip arc portion that satisfies t ≦ R ≦ 10t with respect to t, and a pair of linear portions that are connected to both ends of the tip arc portion and extend tangentially from the both ends,
The flat roller as the roller is configured to have a processing plane that is a straight line parallel to the roller rotation axis in a sectional view including the roller rotation axis,
The control means controls the roller moving mechanism to move the curved roller from the outer diameter surface of the disk-shaped material in the inner diameter direction approaching the spindle rotation axis, and to move the outer diameter surface of the disk-shaped material. The circular arc portion on the processing surface of the curved roller is brought into contact with each other, and a part of the disc-shaped material is sequentially flowed to both end sides of the circular arc portion along the distal arc portion, A first plastic working step for plastically deforming the outer diameter side end of the plate-like material into a substantially Y shape in a longitudinal sectional view, and after the execution of the first plastic working step, the working plane of the flat roller is plastically deformed. A second plastic working step in which the outer diameter side end of the disk-shaped material is plastically deformed into a generally T-shape by pressing from the outer diameter side of the generally Y-shaped disk-shaped material to the inner diameter side. In a configuration that executes
In the direction along the roller rotation axis, the width of the arcuate end portion of the curved roller is a disc shape plastically deformed to the arcuate end portion and the approximate Y shape when the first plastic working step is completed. It is set to a width greater than the contact width with the material ,
The flat roller has a groove portion recessed on the roller rotation axis side on the processing plane, and the width of the groove portion is the outer diameter side end portion of the disk-shaped material plastically deformed into the substantially Y shape. A plastic working device set to a width larger than the width . A main shaft driven and rotated by a main shaft rotation axis, a mandrel provided at a tip of the main shaft, to which a disk-shaped material is attached, a clamping mechanism for clamping the disk-shaped material between the mandrel, and a roller rotation shaft A roller configured to be rotatable at a center and pressing the outer diameter surface of the sandwiched disk-shaped material to plastically deform the disk-shaped material; and at least the roller approaches or close to the spindle rotation axis A plastic processing method for a disk-shaped material using a roller moving mechanism for moving in a separating direction,
A processing surface that protrudes toward the disc-shaped material in a cross-sectional view including the roller rotation axis is provided, and the processing surface has a radius of curvature R with respect to the thickness t of the disc-shaped material, t ≦ R ≦. A curved roller as the roller formed with a tip arc portion of 10t and a pair of linear portions connected to both ends of the tip arc portion and extending in a tangential direction from the both end portions;
Using a flat roller as the roller having a processing plane that is a straight line parallel to the roller rotation axis in a cross-sectional view including the roller rotation axis,
The curved roller is moved from the outer diameter surface of the disk-shaped material in the inner diameter direction approaching the spindle rotation axis, and the tip arc portion on the processing surface of the curved roller is moved to the outer diameter surface of the disk-shaped material. And a part of the disk-shaped material is sequentially flowed to both end sides of the circular arc portion along the tip arc portion, and the outer diameter side end portion of the disc-shaped material is viewed in a longitudinal section. The first plastic working step for plastically deforming into a substantially Y-shape, and after the execution of the first plastic working step, the work plane of the flat roller is made of the substantially Y-shaped disc-shaped material after the plastic deformation. In a configuration for performing a second plastic working step of pressing the outer diameter side end of the disk-shaped material into a substantially T-shape by pressing from the outer diameter side to the inner diameter side,
In the direction along the roller rotation axis, the width of the arcuate end portion of the curved roller is a disc shape plastically deformed to the arcuate end portion and the approximate Y shape when the first plastic working step is completed. It is set to a width greater than the contact width with the material ,
The flat roller has a groove portion recessed on the roller rotation axis side on the processing plane, and the width of the groove portion is the outer diameter side end portion of the disk-shaped material plastically deformed into the substantially Y shape. A plastic processing method for a disk-shaped material, which is set to a width larger than the width .

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