Spinning device and spinning method

Abstract

The present invention provides a spinning device and a spinning method that can maintain the wall thickness of a base material and easily form a flange portion when forming a flange portion on a cylindrical base material. The spinning device (1) has a flange forming portion, i.e., a second forming portion (7), which abuts against the outer periphery of the small diameter portion (92) and presses the large diameter portion (91) along the direction of the center axis (O9) to deform the large diameter portion (91) while the base material having a large diameter portion (91) and a small diameter portion (92) is relatively rotated, thereby forming a flange portion (93) protruding in a direction away from the center axis (O9) on the large diameter portion (91).

Description

[0001] This application claims priority based on Japanese Patent Application No. 2020-116155 filed on July 6, 2020. The entire contents of the Japanese Patent Application are incorporated herein by reference. Technical Field

[0002] The invention relates to a spinning processing device and a spinning processing method. Background Art

[0003] An example of automobile parts is a shaft. A shaft is sometimes obtained by processing a cylindrical base material.

[0004] Patent Document 1 discloses a spinning device for thinning a cylindrical base material (workpiece). The spinning device includes a rotating roller for thinning the outer peripheral wall of the base material by ironing.

[0005] Patent Document 1: Japanese Patent Application Publication No. 2011-115813

[0006] However, if a thin-walled component is used as a shaft, the strength (deformation resistance) of the component decreases as the thinning occurs, and the component may not be able to withstand the actual use environment.

[0007] In addition, some shafts have flanges. It is known that when a flange is formed by processing a cylindrical base material, the adjacent portion of the flange is also thinned, which causes a decrease in strength. Summary of the invention

[0008] An object of the present invention is to provide a spinning device and a spinning method which can maintain the wall thickness of a base material and easily form a flange portion when forming a flange portion on a cylindrical base material.

[0009] An embodiment of the spinning processing device of the present invention is characterized in that it has a flange forming portion, which abuts against the outer periphery of the small diameter portion and presses the large diameter portion along the direction of the center axis of the base material when a base material that is cylindrical and has at least a large diameter portion and a small diameter portion is relatively rotated, thereby forming a flange portion that protrudes in a direction away from the center axis.

[0010] One embodiment of the spinning method of the present invention is characterized by comprising a processing step of processing a base material which is cylindrical and has at least a large diameter portion and a small diameter portion.

[0011] In the above processing step, a flange forming part is used.

[0012] The flange forming portion contacts the outer periphery of the small diameter portion while the base material is relatively rotated and presses the large diameter portion along the central axis of the base material, thereby forming a flange portion protruding in a direction away from the central axis.

[0013] According to the present invention, when forming the flange portion, the large diameter portion is pressed in the direction of the central axis of the base material to deform it. As a result, a part of the large diameter portion is flattened and the diameter is reduced to form a reduced diameter portion. In addition, if a part of the large diameter portion becomes the reduced diameter portion, a corresponding amount of excess volume is generated in the large diameter portion. The excess volume bulges and deforms in a direction away from the central axis of the base material to form a flange portion.

[0014] Furthermore, as described above, the large diameter portion of the base material is pressed along the central axis of the base material. This pressing can increase the wall thickness of the base material, or keep the wall thickness of the base material almost unchanged. As a result, the wall thickness of the molded product obtained from the base material is minimized so that the wall thickness of the base material is maintained and kept nearly constant. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a partial vertical sectional side view (before the small-diameter portion forming step) sequentially showing the operating state (before the small-diameter portion forming step) of the spinning processing device (first embodiment) of the present invention.

[0016] Figure 2 The diagram is a partial vertical sectional side view sequentially showing the operating state (during forming of a small diameter portion) of the spinning device (first embodiment) of the present invention.

[0017] Figure 3 The diagram is a partial vertical sectional side view sequentially showing the operating state (before the flange portion is formed) of the spinning device (first embodiment) of the present invention.

[0018] Figure 4 The diagram is a partial vertical sectional side view sequentially showing the operating state (during flange forming) of the spinning device (first embodiment) of the present invention.

[0019] Figure 5 yes Figure 2 An enlarged view of the area [A] surrounded by the double-dashed line in FIG.

[0020] Figure 6 yes Figure 4 An enlarged view of the area surrounded by the double-dashed line [B].

[0021] Figure 7 It is a block diagram showing the main part of the spinning device (first embodiment) of the present invention.

[0022] Figure 8The drawings sequentially show the steps of the spinning method of the present invention.

[0023] Fig. 9 The diagram is a partial vertical cross-sectional view sequentially showing the operating state (during forming of a small diameter portion) of the spinning device (second embodiment) of the present invention.

[0024] Fig.10 Partial vertical cross-sectional views showing the operating state (during flange forming) of the spinning device (second embodiment) of the present invention are shown in sequence.

[0025] In the figure:

[0026] 1-spinning processing device, 2-rotation support part, 21-chuck, 23-motor, 3-processing part, 4-first moving mechanism part, 41-direct-acting part, 42-motor, 5-second moving mechanism part, 51-direct-acting part, 52-motor, 6-first forming part, 61-first roller (roller), 611-outer diameter constant part, 612-protrusion, 613-top, 62-first rotating support part, 621-base, 622-axis component, 7-second forming part, 71-second roller (roller ), 711-outer diameter constant portion, 712-convex curved portion, 713-conical portion, 72-second rotating support portion, 721-base portion, 722-axis component, 8-control portion, 81-CPU, 82-storage portion, 9-base material, 9A-primary base material, 9B-secondary base material, 9C-molded product, 91-large diameter portion, 92-small diameter portion, 93-flange portion, 94-portion (step difference portion), O9-center axis, R631-radius, R712-radius, t9-wall thickness (thickness of the wall portion). DETAILED DESCRIPTION

[0027] Hereinafter, a spinning device and a spinning method according to preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0028] <First embodiment>

[0029] Below, reference Figures 1 to 8 The first embodiment of the spinning processing device and the spinning processing method of the present invention is described. In addition, for the convenience of description, the three axes orthogonal to each other are respectively set as the X-axis, the Y-axis and the Z-axis. As an example, the XY plane including the X-axis and the Y-axis is a horizontal plane, and the Z-axis is a vertical axis. In addition, sometimes Figure 1 to Figure 6 middle( Fig. 9 and Fig.10 The upper side is referred to as “upper (or above)”, and the lower side is referred to as “lower (or below)”.

[0030] like Figure 1 to Figure 4As shown, the spinning device 1 includes a rotation support unit 2, a processing unit 3, a first moving mechanism unit 4, and a second moving mechanism unit 5. The spinning device 1 can form a base material 9 to obtain a molded product 9C from the base material 9. The molded product 9C is used as a shaft, for example.

[0031] And, if Figure 7 As shown, the spinning device 1 includes a control unit 8 electrically connected to the rotation support unit 2 , the first moving mechanism unit 4 , and the second moving mechanism unit 5 .

[0032] like Figure 8 As shown, the spinning device 1 can perform the spinning method of the present invention (i.e., sequentially perform the spinning process and the processing process). In addition, in the processing process, the first forming process (small diameter portion forming process) and the second forming process (flange portion forming process) are sequentially performed.

[0033] In the present embodiment, the base material 9 is a cylindrical (circular tube) component. In addition, the base material 9 can be any cylindrical component and is not limited to a cylindrical component. In addition, the base material 9 is made of a metal material such as mechanical carbon structural steel, aluminum or stainless steel.

[0034] Base material 9 exists Figure 1 The state of the primary base material 9A shown and Figure 2 or Figure 3 The state of the secondary base material 9B shown in FIG. Moreover, the base material 9 changes from the state of the primary base material 9A to the state of the secondary base material 9B. Figure 4 The molded product 9C shown. The molded product 9C is used as a shaft.

[0035] The outer diameter and inner diameter of the primary base material 9A are constant along the direction of the central axis O9. Therefore, the wall thickness (thickness of the wall portion) t9 of the base material 9 (i.e., the size (value) after subtracting the inner diameter from the outer diameter) is also constant along the direction of the central axis O9. As described later, the wall thickness t9 remains constant until the molded product 9C is formed. In addition, the definition of "constant" will be given later.

[0036] The secondary base material 9B has a large diameter portion 91 and a small diameter portion 92 arranged adjacent to each other in the direction of the central axis O9. The outer diameter and inner diameter of the large diameter portion 91 and the small diameter portion 92 are different from each other. In addition, the radius difference between the outer diameters of the large diameter portion 91 and the small diameter portion 92 is not particularly limited, for example, it is preferably greater than the wall thickness t9, and more preferably greater than 1 times and less than 2 times the wall thickness t9 (the inner diameter difference is also the same). As a result, for example, the molding of the flange portion 93 in the second molding process becomes easy. In addition, it helps to stabilize the wall thickness t9 from the secondary base material 9B to the molded product 9C.

[0037] The rotation support part 2 can support the processing part 3 and the base material 9 so that they can rotate relative to each other about the central axis O9. Thus, the rotation process is performed. In this embodiment, the rotation support part 2 is configured to rotate the base material 9 relative to the processing part 3 about the central axis O9.

[0038] like Figure 1 to Figure 4 As shown, the rotary bearing 2 has a chuck 21 and a motor 23 .

[0039] The chuck 21 holds one end side (that is, the positive side in the X-axis direction) of the base material 9. Thus, the base material 9 is cantilever-supported in a posture where the central axis O9 thereof is parallel to the X-axis.

[0040] The motor 23 is connected to the chuck 21. By driving the motor 23, its power is transmitted to the chuck 21. Thus, the base material 9 can be rotated around its central axis O9. In addition, in the spinning device 1, the rotation speed of the motor 23 can be changed by adjusting the voltage applied to the motor 23.

[0041] The processing section 3 can perform plastic working on the base material 9 . Thus, the processing step is performed. The processing section 3 includes a first molding section 6 and a second molding section 7 .

[0042] The first molded portion 6 is a small-diameter molded portion used in the first molding step and molds the small-diameter portion 92 on the primary base material 9A. The secondary base material 9B is obtained through the first molding step.

[0043] The second molded portion 7 is a flange molded portion used in the second molding step and molds the flange portion 93 on the secondary base material 9B. A molded product 9C is obtained through the second molding step.

[0044] In addition, the structures of the first molded portion 6 and the second molded portion 7 will be described later.

[0045] like Figure 1 and Figure 2 As shown, the first moving mechanism 4 is a mechanism for independently moving the first molding part 6 in the X-axis direction (horizontal direction) and the Z-axis direction (vertical direction). The structure of the first moving mechanism 4 is not particularly limited, and can be configured to include a linear motion part 41 and a motor 42, for example.

[0046] The linear motion portion 41 is a portion connected to the first molding portion 6 and linearly moves the first molding portion 6 in a predetermined direction, and is composed of, for example, a linear guide and a ball screw.

[0047] The motor 42 is connected to the direct-acting portion 41. By driving the motor 42, its power is transmitted to the first forming portion 6 via the direct-acting portion 41. Thus, the first forming portion 6 can be moved. In addition, in the spinning processing device 1, the rotation speed of the motor 42 can be changed by adjusting the applied voltage to the motor 42, thereby changing the moving speed of the first forming portion 6.

[0048] like Figure 3 and Figure 4 As shown, the second moving mechanism 5 is a mechanism for independently moving the second molding part 7 along the X-axis direction (horizontal direction) and the Z-axis direction (vertical direction). The structure of the second moving mechanism 5 is not particularly limited, and for example, it can be configured to include a linear motion part 51 and a motor 52.

[0049] The linear motion portion 51 is a portion connected to the second molding portion 7 and linearly moves the second molding portion 7 in a predetermined direction, and is composed of, for example, a linear guide and a ball screw.

[0050] The motor 52 is connected to the direct-acting portion 51. By driving the motor 52, its power is transmitted to the second forming portion 7 via the direct-acting portion 51. Thus, the second forming portion 7 can be moved. In addition, in the spinning processing device 1, the rotation speed of the motor 52 can be changed by adjusting the applied voltage to the motor 52, thereby changing the moving speed of the second forming portion 7.

[0051] like Figure 7 As shown, the control unit 8 is electrically connected to the rotating support unit 2, the first moving mechanism unit 4 and the second moving mechanism unit 5, so as to control their actions. The control unit 8 has a CPU 81 and a storage unit 82. The CPU 81 can, for example, execute a control program pre-stored in the storage unit 82. The control program includes, for example, a program for controlling the operating conditions (operation timing) of the rotating support unit 2, the first moving mechanism unit 4 and the second moving mechanism unit 5 so as to mold the base material 9 into the molded product 9C.

[0052] As described above, the processing portion 3 includes the first molded portion 6 and the second molded portion 7. The first molded portion 6 is a small diameter molded portion that molds the small diameter portion 92 on the primary base material 9A in the first molding step. The second molded portion 7 is a flange molded portion that molds the flange portion 93 on the secondary base material 9B in the second molding step.

[0053] like Figure 1 and Figure 2 As shown, the first molding part 6 has a first roller (roller) 61 and a first rotation support part 62 that supports the first roller 61 so as to be rotatable. In this embodiment, the combination of the first roller 61 and the first rotation support part 62 is configured in two groups, one upper and one lower. Thus, the small diameter part 92 can be molded stably and quickly.

[0054] In addition, the number of combinations of the first roller 61 and the first rotation support portion 62 is not limited to two groups, and may be one group or more than three groups, for example. In addition, each group has the same structure except that the configuration position is different, so the structure of the lower group is described as a representative.

[0055] The first rotation support portion 62 includes a base portion 621 and a shaft member 622 .

[0056] The base portion 621 is connected to the linear motion portion 41 of the first moving mechanism portion 4 .

[0057] The shaft member 622 has a cylindrical shape parallel to the central axis O9 (ie, the X-axis) of the primary base material 9A, and is cantilever-supported by the base portion 621. The shaft member 622 is connected to the center portion of the first roller 61.

[0058] The first roller 61 is disc-shaped and is arranged so that its central axis is parallel to the X-axis. The first roller 61 has a constant outer diameter portion 611 and a protruding portion 612 .

[0059] The constant outer diameter portion 611 is a portion of the first roller 61 where the outer diameter is constant along the X-axis direction.

[0060] A protrusion 612 is disposed adjacent to the X-axis direction positive side of the outer diameter constant portion 611. The protrusion 612 protrudes in a direction away from the central axis of the first roller 61 (ie, outward) and is provided along the outer periphery of the first roller 61 in an annular shape.

[0061] The top 613 of the protrusion 612 has a rounded corner, and the radius R613 of the rounded corner (refer to Figure 5 ) is not particularly limited, and is preferably greater than the wall thickness t9, and more preferably greater than 1 time and less than 3 times the wall thickness t9. Thus, the radius difference between the outer diameters of the large diameter portion 91 and the small diameter portion 92 can be set within the above numerical range. In addition, the outer diameter at the top portion 613 becomes the maximum outer diameter of the first roller 61.

[0062] When forming the small diameter portion 92 on the primary base material 9A, first, Figure 1 As shown, the first roller 61 is in a state of being separated from the primary base material 9A toward the negative side in the X-axis direction. Then, the rotation support part 2 is operated to rotate the primary base material 9A. This rotation state is maintained until the forming of the small diameter portion 92 is completed.

[0063] Then, if Figure 2As shown, the first roller 61 is brought close to the primary base material 9A. Then, while the top 613 of the protrusion 612 is brought into contact with the outer periphery of the primary base material 9A and moved in the direction of the center axis O9 (X-axis direction), the outer periphery is pressed toward the center axis O9 by the top 613. As a result, the outer diameter and the inner diameter of the other end of the primary base material 9A (i.e., the end (a part) on the negative side in the X-axis direction) that becomes the small diameter portion 92 in the secondary base material 9B can be reduced and deformed together (refer to Figure 5 ). By this deformation, the small diameter portion 92 can be formed, so that the secondary base material 9B can be obtained. Then, the first molded portion 6 is retracted from the secondary base material 9B.

[0064] In addition, if Figure 5 As shown, in the outer peripheral portion of the primary base material 9A, a portion (step difference portion) 94 between the large diameter portion 91 and the small diameter portion 92 is rounded in accordance with the shape of the top portion 613 .

[0065] Furthermore, since the outer diameter and the inner diameter of the primary base material 9A are reduced together as described above, the wall thickness t9 in the base material 9B is kept constant while maintaining the wall thickness t9 in the primary base material 9A. Here, "constant" means that the wall thickness t9 after forming is within a range of 60% or more and 120% or less of the wall thickness t9 before forming (the same applies hereinafter).

[0066] As described above, the first roller 61 is supported to be rotatable about an axis parallel to the central axis O9. Since the small diameter portion 92 is formed to be parallel to the central axis O9, it is preferred that the first roller 61 also rotates about an axis parallel to the central axis O9. In addition, the rotation axis of the first roller 61 may be inclined at a predetermined angle relative to the axis parallel to the central axis O9 within the range in which the first roller 61 can function.

[0067] Furthermore, the first roller 61 is an idling roller. Thus, when the protrusion 612 of the first roller 61 is brought into contact with the outer periphery of the primary base material 9A, the first roller 61 can follow the rotation of the primary base material 9A and rotate effortlessly, thereby accurately molding the small diameter portion 92.

[0068] The diameter (maximum outer diameter) of the first roller 61 is not particularly limited, and is preferably, for example, 1 to 10 times the outer diameter of the primary base material 9A (large diameter portion 91), and more preferably 4 to 8 times. Thus, the outer periphery of the primary base material 9A can be appropriately pressed toward the central axis O9 by the top 613 of the protrusion 612, which helps to quickly form the small diameter portion 92.

[0069] like Figure 3 and Figure 4As shown, the second molding part 7 has a second roller (roller) 71 and a second rotation support part 72 that supports the second roller 71 so that it can rotate. In this embodiment, the combination of the second roller 71 and the second rotation support part 72 is configured in two groups, one upper and one lower. Thus, the flange part 93 can be molded stably and quickly.

[0070] In addition, the number of the combination of the second roller 71 and the second rotation support portion 72 is not limited to two groups, for example, it can also be one group or more than three groups. And, each group has the same structure except that the configuration position is different, therefore, as a representative, the structure of the lower group is described.

[0071] The second rotation support portion 72 includes a base portion 721 and a shaft member 722 .

[0072] The base portion 721 is connected to the linear motion portion 51 of the second moving mechanism portion 5 .

[0073] The shaft member 722 has a cylindrical shape parallel to the Z axis and is cantilever-supported by the base portion 721 . The shaft member 722 is connected to the center portion of the second roller 71 .

[0074] The second roller 71 is disc-shaped and is arranged so that its central axis is parallel to the Z axis. The second roller 71 includes a constant outer diameter portion 711 , a convex curved portion 712 , and a tapered portion 713 .

[0075] The constant outer diameter portion 711 is a portion of the second roller 71 where the outer diameter is constant along the Z-axis direction. The outer diameter of the constant outer diameter portion 711 is the maximum outer diameter of the second roller 71 .

[0076] A convex curved portion 712 is disposed on the upper side of the outer diameter constant portion 711. The convex curved portion 712 protrudes with a rounded corner, and the radius R712 (refer to Figure 6 ) is not particularly limited, and is preferably the same as the radius R613 of the top portion 613. Thus, when the large diameter portion 91 is pressed along the direction of the central axis O9 by the convex curved portion 712 as described later, the rounded portion 94 between the large diameter portion 91 and the small diameter portion 92 can be prevented from being accidentally deformed and hindering the formation of the flange portion 93.

[0077] A tapered portion 713 is disposed between the outer diameter constant portion 711 and the convex curved portion 712. Figure 6 As shown in FIG. 1 , each tapered portion 713 is a portion of the second roller 71 whose outer diameter gradually increases toward the outer diameter constant portion 711. Figure 6 In the figure, double-dotted lines are used to overlap Figure 5 status.

[0078] When the flange portion 93 is formed on the secondary base material 9B, first, Figure 3As shown, the second roller 71 is placed in a state of being separated from the secondary base material 9B toward the negative side in the X-axis direction. Then, the rotation support part 2 is operated to rotate the secondary base material 9B. This rotation state is maintained until the flange portion 93 is formed.

[0079] Then, if Figure 4 As shown, the second roller 71 is brought close to the secondary base material 9B. Then, while the second roller 71 is brought into contact with the outer periphery of the small diameter portion 92 and moved in the direction of the center axis O9 (X-axis direction), the large diameter portion 91 is pressed in the direction of the center axis O9 (i.e., toward the positive side of the X-axis direction) by the convex curved portion 712. As a result, a portion of the large diameter portion 91 is flattened and its diameter is reduced to form the reduced diameter portion 92. Furthermore, if a portion of the large diameter portion 91 becomes the reduced diameter portion 92, a corresponding amount of excess volume is generated in the large diameter portion 91. The excess volume bulges and deforms in a direction away from the center axis O9. Then, the bulged portion reaches the constant outer diameter portion 711 and the tapered portion 713 and is trimmed into the shape of the flange portion 93 (refer to Figure 6 ). Thus, the flange portion 93 can be formed at the boundary portion between the large diameter portion 91 and the small diameter portion 92 (that is, between the large diameter portion 91 and the small diameter portion 92), so that the molded product 9C can be obtained. Then, the second molded portion 7 is retracted from the molded product 9C.

[0080] Furthermore, as described above, the large diameter portion 91 of the secondary matrix 9B is pressed toward the positive side in the X-axis direction. This pressing can increase (change) the wall thickness t9. Thus, the wall thickness t9 in the molded product 9C obtained from the secondary matrix 9B is not reduced as much as possible, thereby maintaining the size of the wall thickness t9 in the secondary matrix 9B and keeping it constant. Here, "constant" is the same as described above.

[0081] As described above, according to the spinning apparatus 1 (spinning method), when the flange portion 93 is formed on the base material 9, the wall thickness t9 of the base material 9 can be maintained and the flange portion 93 can be easily formed. As a result, the strength (mechanical strength) of the molded product 9C can be prevented from decreasing due to the reduction in the wall thickness t9, and thus the molded product 9C can fully withstand the actual use environment as a shaft.

[0082] As described above, the second roller 71 is supported to be rotatable about an axis (i.e., Z axis) orthogonal to the center axis O9. The portion of the secondary base material 9B (a portion of the large diameter portion 91) pressed by the convex curved portion 712 of the second roller 71 is parallel to the Z axis direction, so it is preferred that the center axis (rotation axis) of the second roller 71 is parallel to the Z axis. In addition, the rotation axis of the second roller 71 may be inclined at a predetermined angle relative to the axis orthogonal to the center axis O9 within the range in which the second roller 71 can function.

[0083] In addition, the second roller 71 is an idle roller. Therefore, when the second roller 71 is brought into contact with the outer periphery of the secondary base material 9B, the second roller 71 can rotate effortlessly following the rotation of the secondary base material 9B, so that the flange portion 93 can be accurately formed.

[0084] The diameter of the convex curved portion 712 of the second roller 71 is not particularly limited, and is preferably 1 to 10 times, more preferably 4 to 8 times the outer diameter of the large diameter portion 91. Thus, the large diameter portion 91 can be appropriately pressed by the convex curved portion 712, which helps to quickly form the flange portion 93.

[0085] <Second embodiment>

[0086] Below, reference Fig. 9 and Fig.10 A second embodiment of the spinning apparatus and the spinning method of the present invention will be described, but the description will focus on the differences from the above-described embodiment and description of the same configuration will be omitted.

[0087] This embodiment is the same as the first embodiment except that the structure of the rotation support portion 2 is different.

[0088] In the present embodiment, the rotation support portion 2 can be switched between a first connection state connected to the first molded portion 6 and a second connection state connected to the second molded portion 7 by a switching mechanism (not shown).

[0089] Furthermore, in the first connection state, if Fig. 9 As shown in FIG. 1 , the rotation support portion 2 can rotate the first molded portion 6 relative to the mother material 9 around the mother material 9 (central axis O9) while the mother material 9 is fixed. In addition, the first molded portion 6 has two first rollers 61, but in Fig. 9 In FIG. 1 , only one first roller 61 is depicted as a representative.

[0090] And, in the second connection state, if Fig.10 As shown in FIG. 1 , the rotation support portion 2 can rotate the second molded portion 7 relative to the mother material 9 around the mother material 9 (central axis O9) while the mother material 9 is fixed. In addition, the second molded portion 7 has two second rollers 71, but in Fig.10 In FIG. 1 , only one second roller 71 is depicted as a representative.

[0091] By adopting the rotation support portion 2 having the above-described structure, the rotation process can also be smoothly performed, so that the base material 9 can be easily and accurately molded.

[0092] The above describes the embodiment of the spinning device and the spinning method of the present invention, but the present invention is not limited thereto. In addition, each part constituting the spinning device can be replaced with any structure that can perform the same function. In addition, any structure can be added.

[0093] Furthermore, the spinning apparatus and the spinning method of the present invention may be a combination of any two or more structures (features) in the above-mentioned embodiments.

Claims

1. A spinning processing device, characterized in that: A flange forming portion is provided, wherein the flange forming portion processes a base material which is cylindrical and has at least a large diameter portion and a small diameter portion, while the base material is relatively rotated, to form a flange portion protruding from the outer periphery of the large diameter portion toward a direction away from the central axis of the base material, wherein the large diameter portion and the small diameter portion have outer peripheries located at a predetermined length from the central axis, The flange forming portion includes one or more rollers rotatable around an axis orthogonal to the central axis and a motor for rotating the one or more rollers. The one or more rollers respectively include: a constant outer diameter portion; a convex curved portion, which is arranged on the upper side of the constant outer diameter portion and protrudes with rounded corners; and a tapered portion, which is arranged between the constant outer diameter portion and the convex curved portion, and the outer diameter of which gradually increases toward the constant outer diameter portion. By making the convex curved portion abut against the outer periphery of the small diameter portion and pressing the large diameter portion along the direction of the center axis of the base material, a reduced diameter portion is formed in the large diameter portion, and at the same time, the remaining volume generated by forming the reduced diameter portion protrudes in a direction away from the center axis to a position farther away from the center axis than the position at a specified length from the center axis and reaches the constant outer diameter portion and the convex curved portion, thereby forming the flange portion.

2. The spinning device according to claim 1, characterized in that: The base material has a primary base material state in which the outer diameter is constant along the central axis direction and a secondary base material state having the large diameter portion and the small diameter portion. The base material becomes the state of the secondary base material after the state of the primary base material, The spinning device includes a small-diameter portion molding section that reduces the outer diameter of a portion of the primary base material that becomes the small-diameter portion in the secondary base material to thereby mold the small-diameter portion.

3. The spinning device according to claim 2, characterized in that: The small diameter portion molding portion includes a roller rotatable about an axis parallel to the central axis.

4. A spinning method, characterized in that: The method comprises the steps of using a flange forming portion to process a base material which is cylindrical and has at least a large diameter portion and a small diameter portion, wherein the large diameter portion and the small diameter portion have outer circumferences located at predetermined lengths from a central axis of the base material. The flange forming portion includes one or more rollers rotatable around an axis orthogonal to the central axis and a motor for rotating the one or more rollers. The one or more rollers respectively include: a constant outer diameter portion; a convex curved portion, which is arranged on the upper side of the constant outer diameter portion and protrudes with rounded corners; and a tapered portion, which is arranged between the constant outer diameter portion and the convex curved portion, and the outer diameter of which gradually increases toward the constant outer diameter portion. In the processing steps, When the base material is relatively rotated, the convex curved portion is brought into contact with the outer periphery of the small diameter portion and the large diameter portion is pressed along the direction of the center axis of the base material, thereby forming a reduced diameter portion in the large diameter portion, and at the same time, the remaining volume generated by forming the reduced diameter portion protrudes in a direction away from the center axis to a position farther away from the center axis than the position at a specified length from the center axis and reaches the constant outer diameter portion and the convex curved portion, thereby forming a flange portion protruding from the outer periphery of the large diameter portion in a direction away from the center axis.

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