JP2009018342A - Method of forming different diameter part of workpiece - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method by which a similar shape to one formed by an inclined spinning method is formed even when using an eccentric spinning method. <P>SOLUTION: In the eccentric spinning method, a small diameter part having an inclined shape to the center axis of a workpiece by individually performing drive control so that the orbit of a roller which is revolved on the revolution plane which is perpendicular to the center axis of the workpiece becomes non-circular and also the center position of the revolution is cooperatively controlled. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method for forming a different diameter portion of a workpiece, and relates to a method for forming a different diameter portion in which a tapered portion and a cylindrical reduced diameter portion are integrally formed at an end portion of a cylindrical metal tube material.

  A different-diameter portion forming method in which a tapered portion and an eccentric (eccentric) reduced diameter portion (straight tubular cylindrical portion) are integrally formed at the end of a cylindrical metal tube material (hereinafter referred to as a workpiece) by spinning. For example, in Patent Document 1 below, there is an instantaneous (virtual) revolution axis during the spinning process of a center axis of a workpiece (non-processed part) and a spinning forming roller (also referred to as a forming roll, hereinafter referred to as a roller). Spinning is performed on the workpiece by setting it to be eccentric and moving the workpiece and roller in the direction of the workpiece axis while reciprocally rotating around the revolution center axis with the revolution center axis and the machining target axis aligned. And a method for forming a cylindrical small diameter portion that is eccentric with respect to the center axis of the workpiece is disclosed. Here, the roller always draws a circular orbit on a plane (revolution surface) perpendicular to the workpiece center axis, and in the case of a plurality of rollers, draws the same circular orbit. Further, Patent Document 2 and Patent Document 3 disclose a method for obtaining a final target shape with a high contraction rate and high accuracy by setting a plurality of target processing axes and target shapes for each spinning processing cycle. Yes. These are collectively referred to as “original eccentric spinning method”.

  Patent Documents 4 to 7 listed below are one embodiment of the inherent eccentric spinning method, and maintain (restrict) the rotation axis of the roller support means (face plate or the like) and the work center axis on the same axis. Thus, a special embodiment is disclosed in which the (virtual) revolution center axis and revolution track of the roller are eccentric from the center axis of the workpiece (non-machined part) to form an eccentric reduced diameter part. These are collectively referred to as “restricted eccentric spinning method”.

  In the limited eccentric spinning method, the relationship between the workpiece center axis and the instantaneous roller revolution axis during spinning is the same as that of the original eccentric spinning method. . Since only the peripheral part and the non-essential part such as the roller support and driving method are different, it is not possible to enjoy the processing advantage over the original eccentric spinning method. However, facility convenience is expected in that it can be handled by the roller operation only when the eccentric drive of the clamp means and the roller revolving means is restricted due to the equipment mechanism or the equipment installation space. it can.

  Further, Patent Documents 5 to 7 also disclose a method of forming a non-eccentric cylindrical small-diameter portion with respect to the central axis of a workpiece (non-processed portion) using a limited eccentric spinning method. Yes. This is because the work center axis and the center axis of the cylindrical small diameter portion disclosed in the above-mentioned publication 3 have an angle with each other in the same plane, or both axes are twisted three-dimensionally. It is described as if it is based on the related “twist spinning method” and if an approximate workpiece shape is obtained. However, for the reason described later, such an approximate shape cannot actually be formed.

  Of the above-described “inclined spinning method” and “twisted spinning method”, the fact that the shape of the “inclined spinning method” cannot be realized by the restrictive eccentric spinning method will be described in detail with reference to FIGS. Note that the “twist spinning method” is an applied method in which the axial relationship of the “inclined spinning method” is made non-coplanar, and therefore, repeated description is omitted. FIG. 5 to FIG. 7 are diagrams in which a common concept is estimated and modeled for a pseudo method of the inclined spinning method called “deflection spinning” described in Patent Documents 5 to 7. FIG. However, although any patent document is called declination spinning, detailed description of its meaning and specific construction method is lacking, so this is not mentioned.

  FIG. 5 shows a workpiece 100 composed of a non-machined portion 101 that is a raw pipe, and a tapered portion 103 and a small-diameter portion 104 that are formed by eccentric spinning. The central axis 102 of the non-processed part 101 and the central axis 106 of the straight tubular small diameter part 104 are eccentric (offset). In the spinning process for forming the tapered portion 103 and the small-diameter portion 104, the circular orbit of the roller 107 whose revolution centers are the intersection centers a, b, d, c, and e moves toward the central axis 102 while reducing the diameter. Made by. The circular orbit is always on a revolution surface (108, 109, etc.) perpendicular to the central axis 102, and the revolution surface relatively translates in the direction of the central axis 102. Note that this relationship is the same regardless of whether the eccentric eccentric spinning method is fundamentally used or the limited eccentric spinning method.

  FIG. 6 shows a workpiece 200 described in Patent Documents 5 to 7 as being capable of being formed and having a small diameter portion 204 that is non-eccentric with respect to the central axis 202. And the pre-process which reaches the workpiece | work 200 is FIG. First, the eccentric reduced diameter portion 104 of FIG. 7 is formed by the above-described restrictive eccentric spinning method. Next, it is assumed that the eccentric small diameter portion 104 is subjected to eccentric spinning processing a plurality of times between the roller revolution centers d and g to form the cylindrical small diameter portion 204 of FIG. In addition, the cylindrical small diameter part 204 described the virtual center axis 208 in the same plane as the center axis 202 and in an inclined state for convenience.

  In order to deform the small-diameter portion 104 in FIG. 7 into the small-diameter portion 204 in FIG. 6 by spinning, it is necessary to achieve diameter reduction processing for β on the lower side of the drawing and diameter expansion processing for γ on the upper side of the drawing. . However, in the spinning process, which is a rotational plastic process, a desired shape is obtained by plastic flow of the surplus due to the reduced diameter, and therefore it is impossible to expand the diameter by γ. That is, it is impossible for the roller 107 to flow the material to the γ region which is not included from the beginning. If the small-diameter portion 104 can be bent and deformed to the small-diameter portion 204 with substantially the same diameter, it is not a spinning process but a bending process, but there is no bending metal core and a roller that is a point contact. It is clear that bend processing cannot be expected, and Patent Documents 5 to 7 do not have an explanation to that effect. As described above, it is impossible to bend the small-diameter portion 104 in FIG. 7 into the small-diameter portion 204 in FIG. 6 by the current spinning process.

  Even if the small diameter portion 104 can be deformed to 204 by spinning (by adding some means), the end face 205 draws an ellipse in the Y view on the virtual central axis 208. That is, an elliptical cross section having a major axis and a minor axis and crushed by an angle θ1 is generated, and there is a problem that a fitting connection with a mating part having a circular section with respect to the connection axis (virtual central axis 208) is not possible. . This is an unavoidable result as long as the roller revolves on a revolving surface 107 perpendicular to the central axis 302 in a circular orbit.

Japanese Patent No. 2957153 Japanese Patent No. 3442666 Japanese Patent No. 3390725 JP 2000-64832 A JP 2003-181554 A JP 2003-164920 A JP 2001-321859 A

  In view of the above problems, an object of the present invention is to propose a construction method that can form a similar shape to that obtained by the inclined spinning method even if an eccentric spinning method is used.

  In order to solve the above-mentioned problem, in the first invention, the workpiece center axis and the revolution center axis of the roller are eccentric, and the workpiece centering on the revolution center axis in a state in which the revolution center axis coincides with the machining target axis. And rotating the roller in a reciprocal manner, and by rotating the roller against the workpiece outer peripheral surface and relatively driving in the direction along the workpiece center axis, spinning is performed, and the workpiece has a different diameter of the tapered portion and the cylindrical small diameter portion formed at the tip In the part forming method, the roller track on the revolution surface perpendicular to the center axis of the workpiece is driven and controlled so as to be a non-circular shape that is rotationally symmetric about the revolution center axis, and the taper portion and / or the cylindrical small diameter portion is the revolution surface. A spinning process for forming a non-circular cross section is included above.

  In the second invention, in the first invention, the eccentric amount and the revolution trajectory are changed in cooperation with the relative drive in the direction along the work center axis of the roller.

  In the third invention, after the spinning process in the second invention, the taper part and the cylindrical small diameter part are narrowed down into a drum shape by the same spinning process, and the taper part and / or the cylindrical small diameter part are used as the central axis of the workpiece. In contrast, they are formed non-parallel.

  According to the present invention, the eccentric spinning method can form a shape similar to that of the inclined spinning method.

  Hereinafter, the spinning method of the present invention will be described with reference to the drawings. FIGS. 1A to 1G show the eccentric spinning process according to the first embodiment of the present invention for each step (spinning cycle). In order to increase the diameter reduction rate and the shape accuracy of the workpiece, it is preferable to increase the number of spinning cycles (number of steps) in this way. Of course, it is also preferable to increase the number of roller passes per cycle (the number of reciprocations).

  First, in the step (A), the end of the metal pipe (work 1) (not shown) is subjected to a known eccentric spinning process (original eccentric spinning method or restrictive eccentric spinning method), and no processing is performed. The workpiece 2 is formed by integrally forming a cylindrical small diameter portion 5 having a shaft 7 eccentric with respect to the central axis 6 of the portion 3 and a tapered portion 4 between the non-processed portion 3 and the cylindrical small diameter portion 5. obtain. At this time, the revolution center axis of each roller 9 is the axis 7, and the axis 7 is the center axis (target machining axis) of the target machining shape in the step, and the workpiece 1 and the roller 9 are relatively moved around the axis 7. Inverted. In addition, the cross section of the metal pipe which is an element pipe is not restricted circularly, but is arbitrary.

  Regardless of the inherent eccentric spinning method or the limited eccentric spinning method, the roller revolution in the steps (A) to (C) is centered on the revolution center (8, 16, 26) and perpendicular to the workpiece center axis. A circular orbit on the surface is sufficient. Although one roller may be on the same revolving surface, a plurality of rollers are arranged on the revolving track at equal intervals to change the diameter (open and close) at the same time while revolving in order to improve processing efficiency and accuracy. Is preferred. In the present embodiment, three rollers 9 are arranged at equal intervals on the same track on the same revolution surface. As the relative reversal drive of the workpiece and the roller, a method of gripping the workpiece in a non-rotatable manner and revolving the roller may be used, or a method of rotating the workpiece around the central axis and relatively reciprocating the roller in the axial direction and the axis perpendicular direction may be used. However, a combination of both types may be used.

  Subsequently, in the next step (B), the revolution center axis 15 is made to coincide with the next target axis, and the end of the work 2 formed in the previous step is similarly subjected to eccentric spinning, A cylindrical small diameter portion 13 having a large eccentric interval and a small diameter is formed, and the workpiece 10 is obtained.

  Subsequently, in step (C) as the next step, the revolution center axis 25 is made to coincide with the next target axis, and the end of the workpiece 10 formed in the previous step is similarly subjected to eccentric spinning, A cylindrical small diameter portion 23 having a large eccentric interval and a small diameter is formed, and the workpiece 20 is obtained.

  Subsequently, in step (D) as the next step, the eccentric interval is further increased from the workpiece 10, and the shaft 35 that is the roller revolution center axis and the target machining axis is set. Then, unlike the roller revolution trajectory up to the process, each roller 9 is revolved on the revolution surface by an elliptical trajectory centered on the shaft 35. The elliptical orbit is a 180-degree axially rotationally symmetric shape having a minor axis in the vertical direction and a major axis in the front and rear directions in FIG. 4D, and the ellipticity is set so that a cut surface 48 described later becomes a perfect circle. . A cylindrical small-diameter portion 33 having a shaft 35 that is eccentric with respect to the central axis 34 of the non-processed portion 31 and having an elliptical cross section on the revolution plane, and a non-processed portion A workpiece 30 is obtained by integrally forming a taper portion 32 whose cross-sectional shape gradually changes between 31 and the cylindrical small-diameter portion 33.

  Such a non-circular roller track has a rotationally symmetric shape around the revolution center axis on the revolution surface. That is, it has a shape that matches itself every rotation of a specific angle on the revolution surface, and in addition to the ellipse, an ellipse (180 degree rotational symmetry / two-fold symmetry), an equilateral triangle (120 degree rotational symmetry / (3 times symmetry), polygons (rotational symmetry of the angle for each shape), etc., and so on, may be applied arbitrarily. In any roller track shape, the rotationally symmetric center point is always on the roller revolution center axis of the instantaneous spinning process.

  Subsequently, in the step (E), an eccentric spinning process similar to that in the step (D) is performed to obtain a cylindrical small-diameter portion 43 having a further eccentric and small-diameter elliptical cross section on the revolution surface. And the cylindrical small diameter part 43 is cut | disconnected by the cut surface 48 which cross | intersects at the angle (theta) 2 with respect to the axis | shaft 45, and a front-end | tip part is discarded.

  (F) shows a workpiece 50 having a cylindrical small-diameter portion 51 in which the tip of the workpiece 40 is cut off. The end surface 52 of the cylindrical small-diameter portion 51 draws a substantially perfect circle having an end surface center 53 when the surface is viewed directly (as viewed from the shaft 55). Therefore, for example, if the workpiece 50 is provided as a casing for an exhaust pipe part, the connection with a mating part (exhaust pipe, exhaust part, etc.) having a substantially circular connecting portion around the shaft is cylindrical on the shaft 55. It becomes a fitting between each other, and airtightness is also maintained.

  (G) is an example in which a plate-like fastening flange 56 is used for connection with a counterpart component. In this way, the fastening flange 56 having a circular cross-sectional opening can be externally fitted to the cylindrical small diameter portion 51 and fixed by welding.

  As described above, in the present embodiment, a circular roller raceway is applied in the revolution surface in the steps (A) to (C), and an oval shape is used in the steps (D) to (E) corresponding to the finishing step. Since a non-circular) roller track is applied, a cylindrical small-diameter portion similar to the inclined spinning method can be formed even with the eccentric spinning method. That is, in FIG. (F), a circular cross section can be formed around the shaft 55 without performing roller revolution with the shaft 55 as the center of revolution. Although all the steps (A) to (E) may be elliptical (non-circular) roller raceways, since there is a concern that the control of the roller raceway will be complicated and the revolution speed (machining speed) may be reduced, machining that does not hinder the process. It is reasonable to apply conventional circular orbit spinning in the step.

  2 embodiment of the equipment which embodies the above process is shown. The first embodiment is an apparatus shown in FIG. 8, and as described in Patent Documents 1 to 3, an embodiment in which the work is non-rotating (non-rotating) and the roller revolves around the work, so-called work fixing. It is a formula. In the construction method described in Patent Documents 1 to 3, a plurality of rollers having the same diameter revolve around a (instantaneous virtual) revolution axis in a circular orbit, whereas in this embodiment, each roller revolves on a non-circular orbit. It is characterized by drawing a rotationally symmetric figure around the revolution axis in common.

  In the spinning processing apparatus 400, a casing 401 is placed on a base 404 via rails 405 and guides 406, and the casing 401 is moved on the base 404 in the X-axis direction by sliding the rails 405 and the guides 406. Relative movement can be made arbitrarily. The details of the relative drive device of the base 404 and the housing 401 and the control of each axis in the spinning process conform to Patent Documents 1 to 3. The main shaft 402 and the face plate 403 fixed to the main shaft 402 are arbitrarily rotated by a conventional rotary drive device (not shown) in the housing 401.

  Electric drive actuators A407, B408, and C409 are attached to one side surface of the face plate 403 at equal intervals. Spinning rollers A413, B414, and C415 are rotatably attached to the tip portions of the arms A410, B411, and C412 that pass through the actuators A407, B408, and C409. While the rotation center shafts of the rollers A413, B414, and C415 are kept in parallel with the center shaft 417 of the main shaft 402, the actuators A407, B408, and C409 are arbitrarily moved close to / separated from each other (hereinafter referred to as opening / closing drive). Has become free. That is, an opening / closing drive instruction and power from a conventional control device (not shown) are individually transmitted to the actuators A407, B408, and C409 via the housing 401, the main shaft 402, and the face plate 403, respectively, and the arms by the actuators A407, B408, and C409 are transmitted. The rollers A413, B414, and C415 are driven to open and close individually or simultaneously by the individual forward and backward driving of A410, B411, and C412. Of course, the opening / closing drive can be performed while the face plate 403 is rotating in the Y direction and the housing 401 is moving in the X direction. For the electrical transmission path from the control device to the actuators A407, B408, and C409, a well-known and conventional mechanism such as slip feeding may be applied. The driving of the actuators A407, B408, and C409 is not limited to electric, but is optional such as hydraulic driving or pneumatic pressure.

  FIG. 8A illustrates a state in which the workpiece 416, which is a raw pipe, is set before starting the processing by an imaginary line, and the right end portion of the workpiece 416 is held in a non-rotatable manner by clamping means (not shown). From this state, similarly to the construction methods described in Patent Documents 1 to 3, the three-axis movements of roller revolution, roller opening / closing, and relative movement in the X-axis direction are cooperatively controlled, and drawing by spinning is performed at the left end of the work 416. To apply.

  FIG. 8B illustrates non-circular orbital revolution of the roller (innermost side), which is a feature of the present invention. In the elliptical revolution track 419 having the center axis 417 of the main shaft 402 as the center of revolution, the rollers A413, B414, and C415 are individually opened and closed during revolution so that the innermost side is in contact with the revolution track 419 and traces the revolution track 419. Driven. That is, the actuators A407, B408, and C409 drive the arms A410, B411, and C412 appropriately in the radial direction according to the index during one revolution. In the spinning process, the elliptical revolution track 419 must be enlarged / reduced along with the movement of the revolution surface in the X-axis direction. Therefore, naturally, the movement of the revolution surface in the X-axis direction and the rollers A413, B414, and C415 are performed. The opening / closing drive is controlled cooperatively by a control device (not shown).

  The construction method of the present invention is realized by such an apparatus and its drive control. The number of rollers on the same track and the roller opening / closing means may be arbitrarily selected, and each roller may be disposed on a plurality of revolution surfaces.

  FIG. 9 shows a second embodiment of an apparatus that embodies the above steps. This is a so-called workpiece rotating type spinning machine 500, which is well known and commonly used in the conventional coaxial spinning machine. While the workpiece 505 itself rotates around its central axis 506, the rollers 507 and 508 are individually moved close to / separated from the central axis 506 (hereinafter referred to as opening / closing drive).

  The housing 501 is fixed on the base 502, and the rotation clamp 503 is held and driven by the housing 501 around the rotation center axis 506. The rotary clamp 503 and the chuck 504 built in the rotary clamp 503 are arbitrarily rotated by a conventional rotary drive device (not shown) in the housing 501. The left side portion of the workpiece 505 is firmly held by the chuck 504 in the rotary clamp 503. As a structure of the chuck 504 and a mechanism for transmitting a grip / release signal and a driving force to the chuck 504, a known mechanism may be used.

  The opening / closing drive instruction from the control device 517 is individually transmitted to the sliders A513 and B514 and the actuators A509 and B510, and the rollers A507 and B508 are individually driven by the actuators A509 and B510 by the individual Y-direction advance / retreat driving. At the same time, it is opened and closed. The relative movement of the revolution surface 515, that is, the rollers A507 and B508 in the x direction is performed by the sliders A513 and B514 driving the actuators A509 and B510 in the x + direction or the x− direction, respectively. In FIG. 9, the two rollers are on the same revolution surface 515, but it is optional to set two revolution surfaces by operating the sliders A513 and B514.

  The spinning process itself is merely a reverse of the relative reversal relationship between the workpiece and the roller in the workpiece fixing type in FIG. That is, only the difference between whether the roller or the workpiece is driven to revolve is the same for the workpiece. In the present embodiment, the instantaneous virtual revolution center on the revolution plane 515 is the revolution center axis 516. Since the non-circular revolution track has to be enlarged / reduced along with the movement of the revolution surface 515 in the x-axis direction, naturally, the movement of the revolution surface in the x-axis direction and the opening / closing drive of the rollers A507 and B508 are controlled by the control device. Cooperative control is performed by 517.

  The method of the present invention can also be realized by such an apparatus and its drive control. In addition, the number of rollers on the same track and the roller opening / closing means may be arbitrarily selected, and each roller may be disposed on a plurality of revolution surfaces as in the work rotation type. The workpiece fixed / rotary type device selection is optional. Furthermore, a double-rotation type combining both is also conceivable, but it is only complicated and no merit can be expected.

  2 to 4 show an eccentric spinning process according to the second embodiment of the present invention, and a straight tubular small-diameter portion that is non-parallel in the same plane with respect to the central axis 81 of the workpiece 80 of FIG. This is a construction method for forming 83. That is, it is possible to form a tapered portion and a small diameter portion similar to the shape by the inclined spinning method.

  First, an eccentric spinning process of steps (A) to (C) in the first embodiment is performed on a workpiece base pipe (not shown) to obtain a workpiece 20 for use in the process of FIG. Then, a further eccentric spinning process is performed on the small diameter portion 23. Eccentric spinning is started with the boundary surface 69 of the tapered portion 22 and the small diameter portion 23 of the workpiece 20 as a starting point and the center of the boundary surface 69 as the revolution center. However, in the first embodiment, the revolution center is moved in parallel with the workpiece center axis. However, in this embodiment, the center of revolution is coordinated to move in the direction along the center axis 61 (right side in the figure). Spinning is performed while continuously changing the center amount (vertical direction in the figure) and the revolution track (diameter), and continuously moving the revolution center to the end point c. That is, the movement in the direction of the central axis 61, the eccentric amount, and the revolution trajectory are continuously coordinated controlled so that the innermost side of the roller draws a desired shape, and the eccentric spinning process unique to this embodiment is performed. Is done.

  Here, in the case of a non-circular orbit on the revolution surface, it is of course important that the index (index, the inclination angle of the revolution orbit around the central axis) is also incorporated. In the present embodiment, the index is set so that the minor axis of the elliptical orbit is located in the plane including the center axis 61 and the virtual center axis 76, and the index is processed so that the index does not change. In addition, it is possible to perform machining in which the index of the revolution trajectory changes as the revolution center moves. In that case, however, the index must be added as a cooperative control term.

  In this way, if the revolution trajectory shape on the corresponding revolution surface is also coordinated and continuously controlled in accordance with the position of the revolution center to be moved to a, b,. Tapered portions 65 and 66 are obtained.

  Further, as a finishing process, the eccentric spinning process is performed again from the center of revolution A to C. Also in this finishing process, the tapered portion 65 is narrowed down into a drum shape while cooperatively controlling the revolution center position (coordinates) and the revolution trajectory. As a result, a cylindrical throttle portion 74 having a shaft 76 inclined with respect to the workpiece center axis is obtained. That is, the narrowed portion 74 having a shape similar to the shape obtained by the inclined spinning process is obtained. This method is different from the method shown in FIGS. 5 to 7 because the diameter of the portion where the material exists is reduced, so that the roller always contacts and presses the outer surface of the workpiece, and the drawn portion 74 can be realized without difficulty by plastic flow.

  As described above, a workpiece 80 having a narrowed portion and a non-parallel small-diameter portion similar to the shape obtained by the inclined spinning process can be obtained. In the finishing process, if an elliptical orbit is applied as in the first embodiment, it is possible to obtain a small-diameter portion 83 having a circular cross section in the X view on the virtual central axis 76. For example, when used as a case of an exhaust part such as the catalytic converter 86, a fastening flange 85 may be fitted and fixed by welding as shown in FIG.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to the above-mentioned embodiment, Even if there is a change of the range which does not deviate from the meaning of this invention, it is included by this invention.

  The present invention is applicable to spinning processing of any metal pipe.

It is a processing step figure of a 1st embodiment. It is processing explanatory drawing of 2nd Embodiment. It is a figure which shows the molded article by 2nd Embodiment. It is a figure which shows the application example of the molded article by 2nd Embodiment. It is a figure which shows the prior art. It is a figure which shows the prior art. It is a figure which shows the prior art. It is a figure which shows 1st Embodiment of the apparatus which implement | achieves the process of this invention. It is a figure which shows 2nd Embodiment of the apparatus which implement | achieves the process of this invention.

Explanation of symbols

1, 2, 10, 20, 30, 40, 50, 60, 70, 80, 100, 200, 300 416, 505 Work 3, 11, 21, 31, 41, 62, 101, 201, 301 Non-machined part 4 12, 22, 32, 42, 64, 65, 66, 82, 103, 203, 303 Taper part 5, 13, 23, 33, 43, 51, 83, 104, 204 Cylindrical small diameter part 6, 14, 24 , 34, 44, 61, 81, 102, 106, 202, 302, 417, 506 Center axis 7, 15, 25, 35, 45, 206, 207, 516 Revolving center axis 8, 16, 26, 36, 46, Revolution center 9, 73, 107, 413, 414, 415, 507, 508 Roller 48, 75 Cutting surface 56, 85 Fastening flange 53 End surface center 54 Angle 55, 76, 208 Virtual center line 63 Annular groove 4 , 52, 67, 84, 105, 205 End surface 68 End portion 69, 71 Boundary surface 70, 72, 108, 109, 418, 515 Revolving surface 74 Restriction portion 86 Catalytic converter 400, 500 Spinning processing device 401, 501 Housing 402 Main shaft 403 Face plate 404, 502 Base 405 Rail 406 Guide 407, 408, 409, 509, 510 Actuator 410, 411, 412, 511, 512 Arm 503 Rotating clamp 504 Chuck 513, 514 Slider 517 Control device

Claims (3)

The work center and the roller's revolution center axis are decentered, and the work center and the roller are reciprocally rotated around the revolution center axis with the revolution center axis aligned with the machining target axis. In the different diameter part forming method of the work, which is relatively driven in the direction along the work center axis while pressing to perform the spinning process, and the cylindrical small diameter part is formed at the tapered part and the tip thereof
The roller trajectory on the revolution surface perpendicular to the center axis of the workpiece is driven and controlled so as to be a non-circular rotationally symmetric around the revolution center axis.
Including a spinning process for forming the tapered portion and / or the cylindrical small-diameter portion in a non-circular cross section on the revolution surface,
Different diameter part forming method for workpieces. Changing the amount of the eccentricity and the roller trajectory in cooperation with the relative driving of the roller in the direction along the work center axis;
The method for forming a different-diameter portion of the workpiece according to claim 1. After the spinning process, the taper part and the cylindrical small diameter part are narrowed down in a drum shape by the further spinning process, and the taper part and / or the cylindrical small diameter part are formed non-parallel to the central axis of the workpiece.
The method for forming a different diameter portion of a workpiece according to claim 2.

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