JP6062007B2 - Spinning processing method and spinning processing apparatus - Google Patents

Description

  The present invention is a spinning method suitable for application to, for example, a case where a cylindrical member having a three-dimensionally complicated cylindrical shape, such as an exhaust pipe (exhaust pipe) for automobiles, is integrally formed from a cylindrical workpiece. And a spinning processing apparatus.

  Conventionally, as this kind of spinning processing method, with a cylindrical workpiece supported by a chuck or a clamp device, by pressing about 2 to 4 rollers on the outer peripheral surface of the workpiece processing portion while revolving, A method of reducing the diameter of the processed portion is known (for example, see Patent Document 1).

JP 2001-25826 A

  However, in such a spinning method, since a roller is pressed from the outside to the inside (in the direction of the workpiece's axis), the workpiece is usually formed beyond its outer shape (i.e. It is not possible to carry out machining, for example, eccentric machining, without being limited within the range of the outer shape (cylindrical shape).

  In view of such circumstances, it is a first object of the present invention to provide a spinning method capable of performing molding that exceeds the outer shape of a workpiece. A second object is to provide a spinning apparatus suitable for carrying out such a spinning process.

In order to achieve such an object, the invention according to claim 1 is configured such that a plurality of rollers of a spinning head are pressed while revolving a work part of a cylindrical workpiece while the support part of the cylindrical work is supported by the work support means. A spinning method for performing a spinning process, wherein the plurality of rollers are held so as to hold the workpiece during the spinning process, and the rollers are pressed against the workpiece while revolving, and the workpiece support Either one of the means or the spinning head is moved relative to the other so that the tube axis in the processing portion is inclined with respect to the tube axis in the support portion of the workpiece, and at the same time, the spinning processing is performed. , by performing diameter reduction in the processing unit, the outer shape La contour line of the processed portion of the workpiece the support portion Characterized in that the spinning method of applying a molding located N'yori outside.

  According to a second aspect of the present invention, in addition to the configuration according to the first aspect, the workpiece support means is moved during the molding process so that the work support portion is moved so that its operating range is free. By moving the work part of the work relative to the work support means side, the tube axis in the work part is subjected to an eccentric work that deviates from the tube axis in the work support part. To do.

  According to a third aspect of the present invention, in addition to the configuration according to the first or second aspect, in the molding process, the work support means is appropriately necked with the work support means supported by the work support means. By swinging, the tube axis in the processing portion of the workpiece is inclined with respect to the tube axis in the support portion of the workpiece.

  According to a fourth aspect of the present invention, in addition to the configuration according to any one of the first to third aspects, as the roller, revolution surfaces are provided at different positions in the rotational axis direction of the spindle of the spinning head. Using the first roller and the second roller, in the molding process, the first roller and the second roller are held in a state where the first roller and the second roller cooperate to hold the workpiece. And pressing the workpiece against the workpiece while revolving, and moving either the workpiece support means or the spinning head relative to the other, so that the outer shape line of the processed portion of the workpiece becomes the outer shape of the support portion. It is characterized by performing a molding process located outside the line.

  According to a fifth aspect of the present invention, in addition to the configuration of the fourth aspect, a plurality of the first rollers are provided at substantially equal angular intervals on a circumference centered on the rotation axis of the spindle. A plurality of second rollers are alternately arranged as viewed from the direction of the rotation axis of the spindle and the first roller, and a plurality of second rollers are provided at substantially equal angular intervals on the circumference centered on the rotation axis of the spindle. It is characterized by being.

Furthermore, the invention according to claim 6 is a spinning machine in which a spinning work is performed by pressing a plurality of rollers of a spinning head while revolving the work part of the cylindrical work while the support part of the cylindrical work is supported by the work support means. In the processing apparatus, the rollers are pressed against the work while revolving while holding the work so that the plurality of rollers hold the work, and either the work support means or the spinning head is moved to the other The tube axis in the processed part is inclined with respect to the tube axis in the support part of the workpiece, and at the same time, the spinning process is performed to reduce the diameter of the processed part. Thus, the forming process is performed so that the outer shape line of the processed portion of the workpiece is positioned outside the outer shape line of the support portion. Characterized in that the spinning device being.

  According to the first aspect of the present invention, in the spinning process of the cylindrical workpiece, since the outer shape line of the processed portion of the workpiece is formed outside the outer shape line of the support portion of the workpiece, the cylinder is processed. It becomes possible to perform the shaping beyond the outer shape of the workpiece.

  According to the second aspect of the present invention, the cylindrical workpiece is subjected to eccentric processing in which the tube shaft in the processing portion of the workpiece is shifted from the tube shaft in the support portion of the workpiece when the cylindrical workpiece is formed. On the other hand, it is possible to perform molding exceeding the outer shape.

  According to the third aspect of the present invention, when the cylindrical workpiece is formed, the tube axis in the workpiece processing portion is inclined with respect to the tube axis in the workpiece support portion. It becomes possible to perform molding that exceeds the outer shape.

  According to the fourth aspect of the invention, in the state where the first roller and the second roller cooperate to hold the workpiece, the outer shape line of the workpiece processing portion is more than the outer shape line of the workpiece support portion. Since the molding process located on the outer side is performed, it is possible to perform molding exceeding the outer shape of the cylindrical workpiece.

  According to the fifth aspect of the present invention, since the plurality of first rollers and the plurality of second rollers are provided at substantially equal angular intervals on the circumference around the rotation axis of the spinning head, At the time of forming the workpiece, the support points of the first roller and the second roller with respect to the workpiece increase, and the processed portion of the workpiece is pressed almost uniformly by the first roller and the second roller. As a result, it is possible to improve the machining accuracy of the workpiece.

  According to invention of Claim 6, there exists an effect similar to the invention of Claim 1.

It is a figure which shows the workpiece preparation process and roller contact process of the spinning processing method which concerns on Embodiment 1 of this invention, Comprising: (a) is a front view of a spinning processing apparatus, (b) is a right view of a spinning head, c) is a perspective view of a workpiece before processing. It is a figure which shows the eccentricity and diameter reduction process of the spinning processing method which concerns on the same Embodiment 1, Comprising: (a) is a front view of a spinning processing apparatus, (b) is the target of the workpiece | work in this eccentricity and diameter reduction processing process It is a perspective view which shows a shape. It is a front sectional view showing a specific structure of the spinning head of the spinning processing apparatus according to the first embodiment. It is a front sectional view showing a specific structure of the spinning head of the spinning processing apparatus according to the second embodiment of the present invention.

  Embodiments of the present invention will be described below.

Embodiment 1 of the Invention
1 to 3 show a first embodiment of the present invention. In FIG. 1A, the rollers (first roller and second roller) and the like are shown in a cross-sectional view taken along line AA in FIG.

  As shown in FIG. 1, the spinning processing apparatus 1 according to the first embodiment has a table 2 installed horizontally. On the table 2, a work support 3 as a "work support means" is movable in three axial directions (X direction, Y direction, Z direction) while supporting a cylindrical work 4, and The workpiece support 3 is attached to the base 5 and the X axis in the X direction (RX direction), the Y direction around the axis (RY direction), and the Z direction around the axis (RZ direction). The chuck 6 is configured. That is, a base 5 is supported on the table 2 so as to be movable in three axial directions (X direction, Y direction, Z direction), and a chuck 6 that can grip the workpiece 4 is provided on the base 5. , Around the axis in the X direction (RX direction), around the axis in the Y direction (RY direction), and around the axis in the Z direction (RZ direction).

  In addition, a spinning head 7 is installed in the vicinity of the workpiece support 3 (right side in FIG. 1A). The spinning head 7 includes a spindle base (not shown), a spindle 10, and three first spindles. The support shaft 11A includes three second support shafts 11B, three sets (six) of first rollers 12A, three sets (six) of second rollers 12B, and the like (FIGS. 1A and 1B). b)). Here, these three sets of first rollers 12A are provided at equal angular intervals (that is, 120 ° intervals) on a circumference C1 centering on the rotation axis CT1 of the spindle 10. Further, these three sets of second rollers 12B are arranged alternately (that is, separated from each other by 60 °) when viewed from the direction of the rotation axis CT1 of the three sets of first rollers 12A and the spindle 10, so that the spindle 10 They are provided at equal angular intervals (ie, 120 ° intervals) on a circumference C1 centered on the rotation axis CT1.

  That is, a spindle base (not shown) is erected on the table 2, and an annular ring is formed on the side surface of the spindle base at a position facing the chuck 6 as shown in FIG. The spindle 10 is supported by a driving means (not shown) so as to be rotatable about the rotation axis CT1. As shown in FIG. 1 (b), the spindle 10 has six support shafts 11 (three first support shafts 11A and three second support shafts 11B) that are circles centered on the rotation axis CT1. They are arranged on the circumference C1 at equiangular intervals (that is, 60 ° intervals). The first support shaft 11 </ b> A and the second support shaft 11 </ b> B are configured to be able to move independently from each other in the radial direction with respect to the rotation axis CT <b> 1 of the spindle 10. A pair (two) of first rollers 12A having the same diameter is supported on each first support shaft 11A so as to be rotatable about the axis CT21 of the first support shaft 11A. As shown in FIG. 1A, the first roller 12A is attached at a different position in the direction of the rotation axis CT1 of the spindle 10. In addition, a pair (two) of second rollers 12B having the same diameter is supported on each second support shaft 11B so as to be rotatable about the axis CT22 of the second support shaft 11B. As shown in FIG. 1A, the second rollers 12B are attached at different positions in the direction of the rotation axis CT1 of the spindle 10. The revolution surface PL1 of the first roller 12A and the revolution surface PL2 of the second roller 12B are provided at different positions in the direction of the rotation axis CT1 of the spindle 10 as shown in FIG. The first roller 12A and the second roller 12B have the same diameter as shown in FIG.

  More specifically, in the spinning head 7, as shown in FIG. 3, the spindle 10 includes a housing 16 and a face plate 17, and the support shaft 11 (first support shaft 11A, second support shaft 11B) is a slider 18. And a roller holder 20.

  That is, as shown in FIG. 3, the spinning head 7 has a main shaft 15 that is horizontally supported, and a housing 16 is rotatable about the shaft center CT 7 of the main shaft 15. Is attached. An annular face plate 17 is vertically fixed to the housing 16 so that the center thereof coincides with the axis CT7 of the main shaft 15, and six sliders 18 are attached to the face plate 17 in the center of the face plate 17, that is, The main shaft 15 is arranged at equiangular intervals (that is, 60 ° intervals) on the circumference centered on the axis CT7. Each slider 18 can move along the radial direction of the face plate 17 by swinging a boomerang-shaped slide link 19 by driving means (not shown) as shown by a solid line and an imaginary line in FIG. It is configured as follows. That is, each slide link 19 is supported so as to be rotatable about a predetermined rotation axis CT8. The slider 18 is connected to one end 19a of the slide link 19, and the driving means is connected to the other end 19b. ing. Then, the slider 18 can be moved along the radial direction of the face plate 17 by moving the other end 19b of the slide link 19 in the horizontal direction by this driving means. In addition, a roller holder 20 is fixed to each slider 18, and one set (two) of rollers 12 (first roller 12A or second roller 12B) is rotatable in each roller holder 20. It is supported.

  Since the spinning processing apparatus 1 has the above-described configuration, when the spinning work 1 is used to spin the cylindrical workpiece 4, the following procedure is performed.

  First, in the work preparation step, the six support shafts 11 (three first support shafts 11A and three second support shafts 11B) are farthest from the rotation axis CT1 of the spindle 10 along the radial direction of the spindle 10. In this state, as shown in FIG. 1A, the support 4 a of the work 4 is gripped by the chuck 6 of the work support 3. Then, the workpiece 4 is in a state of being supported horizontally in a form in which its axis CT3 coincides with the rotation axis CT1 of the spindle 10.

  Next, the process proceeds to a roller contact process, and the six support shafts 11 are moved along the radial direction of the spindle 10 in a direction approaching the rotation axis CT1 of the spindle 10 to thereby obtain six sets of rollers 12 (three sets of first sets). One roller 12A and three sets of second rollers 12B) are brought into contact with the outer peripheral surface of the workpiece 4. Then, the workpiece 4 is held so that the three sets of first rollers 12A and the three sets of second rollers 12B are held in cooperation. Since the six support shafts 11 are arranged at equiangular intervals on the circumference C1 centered on the rotation axis CT1 of the spindle 10 as described above, the six sets of rollers 12 are also arranged around the workpiece 4. It will be in the state arrange | positioned at equal angle intervals.

  Finally, the process proceeds to the eccentricity / reduction processing step, and the spindle 10 is rotated about the rotation axis CT1, thereby causing the six sets of rollers 12 to revolve around the rotation axis CT1 at a predetermined rotation speed. Then, each roller 12 revolves around the workpiece 4 while rolling with respect to the outer peripheral surface of the processed portion 4 b of the workpiece 4.

  In this state, as shown in FIG. 2A, the six sets of rollers 12 are moved in the centripetal direction along the radial direction of the spindle 10, and the work support 3 is moved away from the spinning head 7 along the X direction. Simultaneously, the work support 3 is moved upward along the Z direction.

  Then, since the support 4a moves diagonally upward (in the direction of arrow M in FIG. 2 (a)) while the workpiece 4b remains at the original position, the workpiece 4 is held in a state where the workpiece 4 is held so as to be held. By the six sets of rollers 12 revolving at the rotational speed, eccentric processing is performed in which the tube axis CT5 in the support portion 4a is shifted upward from the tube axis CT6 in the processing portion 4b. Reduction processing smaller than the diameter of 4a is performed. As a result, as shown in FIG. 2 (b), forming the outer shape line L <b> 2 of the processed portion 4 b on the outer side (lower side in FIG. 2 (b)) with respect to the cylindrical workpiece 4, that is, the workpiece 4. It is possible to perform molding that exceeds the outer shape. In addition, since the eccentric machining and the diameter reduction machining of the workpiece 4 are performed at the same time, the productivity can be improved.

  At this time, as described above, six sets of rollers 12 are arranged at equiangular intervals around the workpiece 4, so that the support points of the rollers 12 with respect to the workpiece 4 increase and the rollers 12 support the workpiece 4. The processing part 4b is pressurized almost evenly. As a result, the machining accuracy of the workpiece 4 can be improved.

  Here, the spinning process of the workpiece 4 is completed.

  Thus, in the spinning head 7, the revolution surface PL1 of the first roller 12A and the revolution surface PL2 of the second roller 12B are provided at different positions in the direction of the rotation axis CT1 of the spindle 10. Therefore, when spinning the cylindrical workpiece 4, the workpiece 4 is firmly fixed by the first roller 12A and the second roller 12B at two points separated from each other in the direction of the rotation axis CT1 of the spindle 10, that is, in the length direction of the workpiece 4. And held. Therefore, the holding state of the workpiece 4 can be ensured and the rigidity of the workpiece 4 can be increased compared to the case where these revolution surfaces PL1 and PL2 are provided at the same position in the direction of the rotation axis CT1 of the spindle 10. As a result, in the spinning process of the cylindrical workpiece 4, the eccentric machining is performed in which the tube axis CT 6 in the processed portion 4 b of the workpiece 4 is shifted from the tube axis CT 5 in the support portion 4 a of the workpiece 4. On the other hand, it is possible to perform molding exceeding the outer shape.

  In the spinning head 7, as described above, two first rollers 12A are attached to each first support shaft 11A, and two second rollers 12B are attached to each second support shaft 11B. It is attached. Accordingly, the contact area between the roller 12 and the workpiece 4 is increased during the spinning process (eccentricity / reducing process) of the workpiece 4 as compared with the case where the first roller 12A and the second roller 12B are provided one by one. Therefore, the spinning process of the workpiece 4 can be performed with high accuracy in a short time.

  Further, in the spinning head 7, since the revolution surface PL1 of the first roller 12A and the revolution surface PL2 of the second roller 12B are provided at different positions in the direction of the rotation axis CT1 of the spindle 10 as described above, Compared with the case where the revolution surfaces PL1 and PL2 are provided at the same position in the direction of the rotation axis CT1 of the spindle 10, even if the diameter of the roller 12 is increased, the rollers 12 are less likely to interfere with each other. The degree of freedom increases.

  Further, as described above, the work support 3 is swingable about the X-direction axis (RX direction), the Y-direction axis (RY direction), and the Z-direction axis (RZ direction). Therefore, when spinning the workpiece 4, the workpiece support 3 is appropriately swung according to the machining shape of the workpiece 4b of the workpiece 4 while the support 4a of the workpiece 4 is supported by the workpiece support 3. The tube axis CT6 in the processing portion 4b of the workpiece 4 can be inclined with respect to the tube axis CT5 in the support portion 4a of the workpiece 4. As a result, it is possible to perform a process of arbitrarily bending the workpiece 4 in the three-dimensional direction.

  Further, as described above, the first support shaft 11A and the second support shaft 11B are configured to be able to move independently from each other in the radial direction with respect to the rotation axis CT1 of the spindle 10. Therefore, the first roller 12 </ b> A and the second roller 12 </ b> B can be reliably brought into contact with the outer peripheral surface of the workpiece 4 in accordance with the machining shape of the workpiece 4 during the eccentric machining and the diameter reduction machining of the cylindrical workpiece 4. Therefore, even if the machining shape of the workpiece 4 is complicated, the machining accuracy of the workpiece 4 can be improved.

[Embodiment 2 of the Invention]
FIG. 4 shows a second embodiment of the present invention.

  As shown in FIG. 4, the spinning head 7 of the spinning processing apparatus 1 according to the second embodiment has a spindle 10 on which the axis CT4 is positioned on the rotation axis CT1 of the spindle 10, that is, on the axis CT7 of the main shaft 15. A substantially pencil-shaped mandrel 13 for steadying the workpiece is attached so as to be movable forward and backward in the direction of the rotation axis CT1 of the spindle 10 (the left-right direction in FIG. 4). Since other configurations are the same as those of the first embodiment, the same members are denoted by the same reference numerals and the description thereof is omitted. The procedure of the spinning method for the workpiece 4 is also the same as that in the first embodiment.

  Therefore, the second embodiment has the same effects as the first embodiment described above. In addition to this, even when the rigidity of the workpiece 4 is low by inserting the mandrel 13 into the processed portion 4b of the workpiece 4 during the spinning processing (eccentricity / reducing diameter processing step) of the workpiece 4, It is possible to process the workpiece 4 with high accuracy by suppressing the shake associated with the spinning processing of the workpiece 4.

[Other Embodiments of the Invention]
In the first and second embodiments described above, the spinning head 7 having the configuration in which the housing 16 is rotatably attached to the main shaft 15 has been described. However, a configuration in which the main shaft 15 rotates with the housing 16 is adopted. Also good.

  In the first and second embodiments described above, the workpiece 4 is moved obliquely upward (X direction and Z direction) in the spinning process (eccentricity / reducing process) of the workpiece 4, thereby moving the workpiece 4. The case of processing has been described. However, instead of moving the workpiece support 3 diagonally upward, the workpiece 4 may be processed by moving the spinning head 7 diagonally downward. That is, any one of the workpiece support 3 and the spinning head 7 may be moved relative to the other. Alternatively, either one of the processing portion 4b of the workpiece 4 or the workpiece support 3 may be moved relative to the other in another direction (for example, the vertical direction, the horizontal direction, etc.).

  In the first and second embodiments described above, the spinning head 7 having the six support shafts 11 (three first support shafts 11A and three second support shafts 11B) has been described. However, the number of support shafts 11 is not limited to six.

  In the first and second embodiments described above, the case where the first roller 12A and the second roller 12B have the same diameter has been described. However, the first roller 12A and the second roller 12B have different diameters. It doesn't matter.

  In the first and second embodiments described above, the spinning head 7 in which two rollers 12 (12A, 12B) are attached to each support shaft 11 (11A, 11B) has been described. However, the number of rollers 12 attached to each support shaft 11 is not limited to two, and may be one or three or more. When the number of rollers 12 increases, the contact area between the roller 12 and the workpiece 4 increases during the spinning processing (eccentricity / reduction processing step) of the workpiece 4, and therefore the spinning processing of the workpiece 4 is performed with high accuracy in a short time. It becomes possible.

  In the first and second embodiments described above, the roller 12 is rotatably supported on the support shaft 11, and the roller 12 is configured to roll with respect to the outer peripheral surface of the work 4 when the work 4 is spun. The spinning head 7 has been described. However, the roller 12 may be fixed to the support shaft 11 so that the roller 12 slides with respect to the outer peripheral surface of the workpiece 4 when the workpiece 4 is spun.

  Further, in the first and second embodiments described above, the case where the workpiece 4 is subjected to eccentric machining during the spinning machining of the workpiece 4 has been described. However, the present invention is not limited to such eccentric processing, and a forming process in which the tube axis CT6 in the processed portion 4b of the workpiece 4 faces in an arbitrary direction may be performed. By doing so, various cylindrical members having a complicated cylindrical shape can be integrally formed from the cylindrical workpiece 4.

  Furthermore, the processing part 4b of the work 4 can be reduced in diameter by appropriately reducing the revolution diameter of the roller 12 in accordance with the forming process of the work 4 in any direction. In this case, since the forming process and the diameter reducing process of the work 4 facing any direction are performed at the same time, the productivity can be increased.

  In the first and second embodiments described above, the case where the first roller 12A and the second roller 12B are provided on separate support shafts 11 (the first support shaft 11A and the second support shaft 11B) has been described. . However, as long as the revolution surface PL1 of the first roller 12A and the revolution surface PL2 of the second roller 12B are provided at different positions in the direction of the rotation axis CT1 of the spindle 10, the first roller 12A and the second roller 12B are supported in the same manner. It may be provided on the shaft 11.

  In the first and second embodiments described above, the spinning head 7 in which the revolution surface PL1 of the first roller 12A and the revolution surface PL2 of the second roller 12B are provided at different positions in the direction of the rotation axis CT1 of the spindle 10, that is, The spinning head 7 provided with the two-stage roller 12 has been described. However, it is also possible to substitute the spinning head 7 provided with three or more stages of rollers 12.

  The present invention relates to a cylindrical member having a three-dimensionally complicated cylindrical shape, specifically, a surge tank, a turbocharger separation tank, a muffler for a motorcycle, a catalytic converter, a diesel exhaust treatment device (diesel particulate filter), This is extremely useful when integrally forming various pressure vessels or the like from a cylindrical material by spinning.

DESCRIPTION OF SYMBOLS 1 ... Spinning processing apparatus 2 ... Table 3 ... Work support stand (work support means)
4 ... Work 4a ... Supporting part 4b ... Machining part 5 ... Base 6 ... Chuck 7 ... Spinning head 10 ... Spindle 11A ... First support shaft 11B ... Second support shaft 12A ... First 1 roller 12B ....... 2nd roller L1..Outline line of workpiece support L2 ... Outline of workpiece processing part PL1 ... Revolution surface of first roller PL2 ... Revolution surface of second roller

Claims (6)

A spinning processing method for performing a spinning process by pressing a plurality of rollers of a spinning head against a processing part of the workpiece while revolving the supporting part of a cylindrical workpiece by a workpiece support means,
While spinning the workpiece, in a state where the plurality of rollers are held so as to hold the workpiece, the rollers are revolved and pressed against the workpiece, and either the workpiece support means or the spinning head is moved to the other The tube axis in the processed part is inclined with respect to the tube axis in the support part of the workpiece, and at the same time, the spinning process is performed to reduce the diameter of the processed part. Thus, a forming process is performed in which an outer shape line of the processed portion of the workpiece is positioned outside an outer shape line of the support portion.   During the forming process, the workpiece support means is moved to move the workpiece support portion so that its operating range is free, so that the workpiece processing portion is moved relative to the workpiece support means side. The spinning processing method according to claim 1, wherein the processing is performed so that the tube shaft in the processing portion is decentered from the tube shaft in the support portion of the workpiece.   During the forming process, the work support means is appropriately swung in a state where the work support part is supported by the work support means, whereby the tube shaft in the work work part is changed to the tube axis in the work support part. The spinning method according to claim 1, wherein the spinning method is inclined with respect to. As the roller, using a first roller and a second roller provided with revolution surfaces at different positions in the rotation axis direction of the spindle of the spinning head,
During the molding process, the first roller and the second roller cooperate with each other and hold the work so as to hold the work, while pressing the work while revolving the first roller and the second roller, By moving either the workpiece support means or the spinning head relative to the other, the outer shape line of the processed portion of the workpiece is subjected to forming processing positioned outside the outer shape line of the support portion. The spinning method according to any one of claims 1 to 3, wherein:   A plurality of the first rollers are provided at substantially equal angular intervals on a circumference centered on the rotation axis of the spindle, and the second rollers are alternately viewed from the rotation axis direction of the first roller and the spindle. 5. The spinning method according to claim 4, wherein a plurality of spindles are provided at substantially equal angular intervals on a circumference centered on the rotation axis of the spindle. A spinning processing device that performs spinning processing by pressing a plurality of rollers of a spinning head against the processing portion of the workpiece while revolving the supporting portion of the cylindrical workpiece with a workpiece support means,
In a state where the plurality of rollers are held so as to hold the work, the rollers are pressed against the work while revolving, and either the work support means or the spinning head is relatively moved with respect to the other. By moving, the tube axis in the processing part is inclined with respect to the tube axis in the support part of the work, and at the same time, the spinning process is performed to reduce the diameter of the work part. A spinning processing apparatus, wherein a forming process is performed such that an outer shape line of a processing portion is positioned outside an outer shape line of the support portion.

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