JP2013081984A - Apparatus for manufacturing unequal thickness rim - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus for manufacturing an unequal thickness rim that can shorten a working time while surely preventing a hollow cylindrical material ring from moving along an axis direction during plastic working.SOLUTION: The respective outer peripheral surfaces on the insertion tip side of a first mandrel 1 and a second mandrel 2 are formed with annular recesses A comprising a first annular recess 1A and a second annular recess 2A reduced in diameter to the inner diameter side. In a position corresponding to the annular recesses A in the direction of an axis X1 of the rotated hollow cylindrical material ring W, a control means moves a pressing roller 3A from the outer diameter side to the inner diameter side to press the outer peripheral surface Ws of the hollow cylindrical material ring W so that a pressed portion Wp is plastically deformed into shape conformed to the annular recesses A and placed in a held state between the pressing roller 3A and the annular recesses A. The control means moves spinning rollers 3B from the outer diameter side to the inner diameter side while maintaining the held state, and moves the spinning rollers 3B in a direction to approach the end from the position corresponding to the annular recesses A in the direction of the axis X1 of the hollow cylindrical material ring W while pressing the outer peripheral surface Ws of the hollow cylindrical material ring W, thus adjusting the thickness of the hollow cylindrical material ring W of straight pipe shape.

Description

  Cylindrical first mandrel and second mandrel that can rotate around the same axis, a plastic processing roller that plastically processes a straight tubular hollow cylindrical element ring from the outer diameter side, and a first mandrel inserted from one end side. An unequal thickness provided with a rotation driving means for rotating the hollow cylindrical element ring in which the second mandrel is fitted and inserted from the other end side relative to the plastic working roller, and a control means for controlling the operation. The present invention relates to a rim manufacturing apparatus.

  Generally, as a tire mounting wheel used in a passenger car, a truck, or the like, there is one configured by welding a disk-shaped disk to a cylindrical rim. As the rim of such a wheel, an unequal thickness rim with a thickness adjusted appropriately by plastic processing of a straight tubular hollow cylindrical element ring is used, reducing the weight while ensuring sufficient strength. Is planned.

  The unequal thickness rim manufacturing apparatus, for example, as disclosed in Patent Document 1, is formed in a cylindrical shape having a uniform outer diameter along the axial direction, and is rotatable around the same axial center. A second mandrel and a spinning roller that moves from the center side toward the end along the axial direction while pressing the outer peripheral surface of the straight tubular hollow cylindrical element ring from the outer diameter side. . Then, the first mandrel is fitted and inserted from one end side in the axial center direction of the hollow cylindrical element ring, and the same mandrel as the first and second mandrels is inserted from the other end side. The outer peripheral surface of the hollow cylindrical element ring rotating around is plastically processed by a spinning roller. Thereby, it is supposed that the thickness of the hollow cylindrical element ring can be appropriately adjusted by the spinning roller.

In addition, as disclosed in, for example, Patent Document 2, the unequal-thickness rim manufacturing apparatus is configured so that a straight tubular hollow cylindrical element ring is moved from a central portion in a direction along the axial direction toward both ends. A flared hollow cylindrical element ring that expands to the outer diameter side is provided with a press processing section that performs press processing. First, the press processing by the press processing section is performed.
In addition, the unequal-thickness rim manufacturing apparatus has a first mandrel and a second mandrel that have a cylindrical shape that is reduced in diameter toward the insertion distal end along the axial direction, and that can rotate around the same axial center. A mandrel and a spinning roller that moves from the center side toward the end along the axial direction while pressing the outer peripheral surface of the hollow cylindrical element ring from the outer diameter side. The first mandrel and the first mandrel are inserted and inserted from one end side in the axial direction of the pressed flare-shaped hollow cylindrical element ring, and the second mandrel is inserted and inserted from the other end side. A flare-shaped hollow cylindrical element ring that rotates around the same axis as the second mandrel is plastically processed by a spinning roller. Thereby, it is supposed that the thickness of the flare-shaped hollow cylindrical element ring can be adjusted appropriately.

Japanese Patent No. 3929200 Special table 2008-509005 gazette

  Here, when the hollow cylindrical element ring in which the first mandrel and the second mandrel are fitted and inserted is plastically processed by the spinning roller, the hollow cylinder element ring may move along the axial direction. Therefore, usually, the end of the hollow cylindrical element ring in the axial direction is chucked in a rotatable state to prevent movement in the axial direction.

As such a configuration, the unequal thickness rim manufacturing apparatus of Patent Document 1 includes a first chuck portion and a second chuck portion for positioning and fixing both ends in the axial direction of the hollow cylindrical element ring. ing.
Specifically, the insertion front end surfaces of the first mandrel and the second mandrel are inlay fitted, the first plate is fixed to the rear end of the first mandrel, and the rear end of the second mandrel is inserted. The second plate is fixed. A first chuck portion that positions and fixes the one end portion between one end portion (end portion on the first mandrel side) of the hollow cylindrical element ring and the first plate, and the other end portion (first portion) of the hollow cylindrical element ring. A second chuck portion that positions and fixes the other end portion between the second mandrel side end portion and the second plate, and the hollow cylindrical element ring extends along the axial direction during plastic processing by the spinning roller. It is configured to prevent movement.

  However, in the unequal thickness rim manufacturing apparatus of Patent Document 1, the spinning roller interferes with the first chuck portion or the second chuck portion that fixes both ends of the hollow cylindrical element ring during plastic processing by the spinning roller. In some cases, it may be difficult to plastically process both ends.

  On the other hand, in the apparatus for manufacturing an unequal thickness rim of Patent Document 2, a configuration for preventing movement of the hollow cylindrical element ring along the axial direction of the hollow cylindrical element is not disclosed. It is considered that the end of the ring is chucked in a rotatable state. Therefore, similarly to the above, there is a possibility that it is difficult to plastically process the end of the hollow cylindrical element ring during the plastic processing by the spinning roller.

  In addition, in the apparatus for manufacturing an unequal thickness rim described in Patent Document 2, it is necessary to convert a straight tubular hollow cylindrical element ring into a flare-shaped hollow cylindrical element ring by a press working unit before plastic working by a spinning roller. . For this reason, the processing time of the press work is added before the unequal thickness rim is formed by the spinning roller, and the time required for forming the unequal thickness rim increases as a whole, and the formation of the unequal thickness rim. The process may be complicated.

  The present invention has been made in view of such circumstances, and its purpose is to reduce the machining time while reliably preventing the hollow cylindrical ring from moving along the axial direction during plastic working. An object of the present invention is to provide an apparatus for manufacturing an unequal thickness rim.

In order to achieve the above object, an apparatus for manufacturing an unequal thickness rim according to the present invention includes a cylindrical first mandrel and a second mandrel that are rotatable around the same axis, and a straight tubular hollow cylindrical element ring having an outer diameter. A plastic working roller for plastic working from the side, and the hollow cylindrical element ring in which the first mandrel is fitted and inserted from one end side and the second mandrel is fitted and inserted from the other end side with respect to the plastic working roller. A non-uniform thickness rim manufacturing apparatus comprising a rotation driving means for relatively rotating and a control means for controlling operation, the characteristic configuration of which is as follows:
A first annular recess having a reduced diameter on the inner diameter side is formed on the outer peripheral surface on the insertion tip side of the first mandrel, and a second annular recess having a diameter reduced on the inner diameter side on the outer peripheral surface on the insertion tip side of the second mandrel. In a state in which the first mandrel and the second mandrel are fitted and inserted into the hollow cylindrical element ring until the insertion tip surface of the first mandrel and the insertion tip surface of the second mandrel contact each other. An annular recess is formed by the first annular recess and the second annular recess,
As the plastic working roller, comprising a pressing roller having a pressing surface having a cross-sectional shape corresponding to the annular recess, and a spinning roller for adjusting the thickness of the hollow cylindrical element ring,
The control means moves the pressing roller from the outer diameter side to the inner diameter side at a position corresponding to the annular recess in the axial center direction of the hollow cylinder element ring rotated by the rotation driving means. By pressing the outer peripheral surface of the ring, the pressed portion is plastically deformed into a shape along the annular recess, and is clamped between the pressing roller and the annular recess,
Further, the control means moves the spinning roller from the outer diameter side to the inner diameter side while pressing the outer peripheral surface of the hollow cylindrical element ring while maintaining the sandwiched state, while pressing the outer peripheral surface of the hollow cylindrical element ring. It is in the point which moves to the direction which approaches an edge part from the position corresponding to the said annular recessed part in a direction, and adjusts the thickness of the said hollow cylindrical element ring.

  According to the above characteristic configuration, the annular recess is formed by the first annular recess of the first mandrel and the second annular recess of the second mandrel, and the outer peripheral surface of the hollow cylindrical element ring is pressed by the pressing roller from the outer diameter side of the annular recess. Since it is pressed, the pressed portion is plastically deformed into a shape along the annular recess, and is sandwiched between the pressing roller and the annular recess. Therefore, even if the hollow cylindrical element ring tries to move along the axial direction, the portion of the hollow cylindrical element ring that is pressed by the pressing roller is locked to the annular recess, and is held by the clamping between the pressing roller and the annular recess. Therefore, the movement along the axial direction of the hollow cylindrical element ring can be reliably prevented. Accordingly, while maintaining such a sandwiched state, the outer peripheral surface of the hollow cylindrical element ring is pressed by the spinning roller, and in a direction approaching the end from the position corresponding to the annular recess in the axial direction of the hollow cylindrical element ring. Even if it is moved and the thickness of the hollow cylindrical ring is adjusted, the hollow cylindrical ring does not move along the axial direction, and high-precision plastic working can be performed. The radial movement of the hollow cylindrical element ring is prevented by pressing from the outer diameter side to the inner diameter side by the pressing roller and spinning roller.

  In addition, the annular recess has an insertion tip of the first mandrel and an insertion tip of the second mandrel so that the insertion tip of the first mandrel and the insertion tip of the second mandrel are in contact with each other. It is formed by the 2nd annular recessed part in the outer peripheral surface of the side. Therefore, when the first mandrel and the second mandrel inserted into the hollow cylindrical element ring are separated from each other and the first mandrel and the second mandrel are withdrawn from the hollow cylindrical element ring, the hollow cylindrical element ring Among them, it can be easily and easily withdrawn without interfering with a portion which is pressed by the pressing roller and plastically deformed to the inner diameter side in a shape along the annular recess.

  That is, a direction along the axial direction by plastic processing the outer peripheral surface of the hollow cylindrical element ring by the spinning roller in a sandwiched state in which the hollow cylindrical element ring is clamped by the pressing roller using a straight tubular hollow cylindrical element ring as a starting material The unequal-thickness rim can be manufactured by adjusting the thickness in the above, and since it is not necessary to perform press work before plastic processing with the spinning roller, the unequal-thickness rim can be manufactured quickly. The straight tubular hollow cylindrical element is a hollow cylindrical element having at least an inner diameter that is substantially constant, and is a hollow cylindrical element having a uniform thickness along the axial direction or a thickness along the axial direction. A hollow cylindrical ring having a thickness slightly varied (the outer diameter slightly varied) is included.

  Therefore, an apparatus for manufacturing an unequal thickness rim capable of shortening the processing time while reliably preventing the hollow cylindrical element ring from moving along the axial direction during plastic processing and realizing accurate plastic processing. Can now be offered.

  According to still another feature of the apparatus for manufacturing an unequal thickness rim according to the present invention, the annular recess is formed as an annular curved recess having a curved cross section, and the pressing surface of the pressing roller has a curved cross section. It is formed as a pressing curved surface, and the curvature of the annular curved concave portion and the curvature of the pressing curved surface are set to the same curvature.

  According to the above characteristic configuration, the annular curved concave portion as the annular concave portion formed on the outer peripheral surfaces of the first mandrel and the second mandrel and the pressing curved surface as the pressing surface of the pressing roller are formed with the same curvature, respectively. Therefore, by pressing the hollow cylindrical element ring with the pressing curved surface of the pressing roller from the outer diameter side of the portion corresponding to the annular curved concave portion in the axial direction, the pressed portion can be reliably and shaped into a shape along the annular curved concave portion. It can be easily plastically deformed and can be securely held between the pressing curved surface of the pressing roller and the annular curved concave portion. Therefore, even if the hollow cylindrical element ring moves along the axial direction, the portion of the hollow cylindrical element ring that is pressed by the pressing roller is securely locked to the annular curved concave part, and the pressing roller and the annular curved concave part are Since the clamping state is reliably maintained by the clamping, the movement of the hollow cylindrical element ring along the axial direction can be more reliably prevented.

  According to still another feature of the apparatus for manufacturing an unequal thickness rim according to the present invention, when the control means adjusts the thickness of the hollow cylindrical element ring by the spinning roller, the spinning roller is connected to the hollow cylindrical element ring. It is that it moves from the position corresponding to the said annular recessed part in the axial center direction of the said hollow cylindrical element ring to an edge part, pressing the outer peripheral surface of this.

  According to the above-described characteristic configuration, the hollow cylindrical element ring is held between the pressing roller and the annular recess, and the spinning roller is connected to the hollow cylindrical element ring while the movement along the axial direction is reliably prevented. The thickness of both ends of the hollow cylindrical element ring can be adjusted reliably by pressing the outer peripheral surface of the hollow cylindrical element while reliably moving it from the position corresponding to the annular recess in the axial direction of the hollow cylindrical element ring to the end part. Can do.

  A further characteristic configuration of the unequal thickness rim manufacturing apparatus according to the present invention is arranged in contact with both end portions in the axial direction of the hollow cylindrical element ring after the plastic working by the pressing roller and the spinning roller is completed. In addition, a pair of knockout means capable of pressing the both end portions toward the center is provided.

  According to the above characteristic configuration, after the plastic processing of the hollow cylindrical element ring by the pressing roller and the spinning roller is finished, the pair of knockout means are disposed in contact with both ends in the axial direction of the hollow cylindrical element ring, By pushing to the center side, the first mandrel and the second mandrel can be reliably and easily withdrawn from the hollow cylindrical element ring. Here, since the pressing roller and the spinning roller are configured to press the hollow cylindrical element ring from the outer diameter side to the inner diameter side, the pressed portion is the outer peripheral surface of the first mandrel or the second mandrel, particularly in the vicinity of the annular recess. Even in such a case, both ends of the hollow cylindrical element ring are pressed toward the center side by the knockout means, so that the first mandrel and the second mandrel can be reliably and easily retracted. Can do.

  According to a further feature of the apparatus for manufacturing an unequal thickness rim according to the present invention, the spinning roller includes: a first spinning roller corresponding to the first mandrel; and a second spinning roller corresponding to the second mandrel. It is in the point which is comprised.

According to the above characteristic configuration, the first spinning roller is disposed on the first mandrel side along the axial direction with the annular recess formed on the insertion tip side of the first mandrel and the second mandrel as the spinning roller. In addition, a second spinning roller is disposed on the second mandrel side. As a result, the hollow cylindrical element ring is clamped at a position corresponding to the annular recess by the pressing roller, and the first spinning roller and the second spinning roller are used toward both end sides from the clamped position. Each can be plastically processed and the thickness can be adjusted.
Therefore, the thickness of the hollow cylindrical element ring can be adjusted more quickly.

  According to still another feature of the apparatus for manufacturing an unequal thickness rim according to the present invention, the spinning rollers are arranged in pairs at positions facing each other in the radial direction across the first mandrel or the second mandrel. There is in point.

  According to the above characteristic configuration, the spinning rollers are arranged in pairs at positions opposed to each other in the radial direction across the first mandrel or the second mandrel. The hollow cylindrical element ring into which the mandrel or the second mandrel is fitted and inserted can be pressed at two locations facing each other in the radial direction (two locations having different pressing directions on the same straight line) and performing stable plastic working. Can do.

Schematic plan view of non-uniform thickness rim manufacturing equipment Schematic side view of unequal thickness rim manufacturing equipment Schematic side view showing a state before the first mandrel and the second mandrel are inserted into the work. Schematic side view showing a state where the first mandrel and the second mandrel are inserted into the work. (A) The schematic side view which shows the state which pressed the location corresponding to the cyclic | annular recessed part in a workpiece | work with a press roller, (b) The schematic front view which shows the same state (A) Schematic plan view showing a state where the thickness of the work on the first mandrel side is adjusted by a spinning roller while pressing the work with a pressing roller, (b) Schematic front view showing the same state (A) Schematic plan view showing a state in which the thickness of the work on the second mandrel side is adjusted by a spinning roller while pressing the work with a pressure roller, (b) Schematic front view showing the same state After adjusting the thickness of the workpiece, a schematic side view showing a state in which the workpiece is pressed toward the center in the axial direction by a pair of knockout means Schematic side view showing a state in which the first mandrel and the second mandrel are withdrawn from the work whose thickness has been adjusted. Schematic side view showing the cross-sectional shape of the pressure roller and the shape of the annular recess according to another embodiment Schematic side view showing the cross-sectional shape of the pressure roller and the shape of the annular recess according to another embodiment

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
As shown in FIGS. 1 and 2, the unequal-thickness rim manufacturing apparatus includes a cylindrical first mandrel 1 and a second mandrel 2 that are rotatable around the same rotation axis X1, a straight tube, and a hollow cylindrical shape. A plastic processing roller 3 that plastically processes a workpiece W (an example of a hollow cylindrical element ring) from the outer diameter side, and a first mandrel 1 is inserted from one end side Wa and a second mandrel 2 is inserted from the other end side Wb. Rotation drive means 4 for rotating the workpiece W relative to the plastic working roller 3 and a control unit 5 (an example of control means) for controlling the operation.

  In addition, the unequal thickness rim manufacturing apparatus rotates the main shaft (not shown) to which the first mandrel 1 is connected as the rotation driving means 4, and rotates the first mandrel 1 about the rotation axis X1. A spindle motor M is provided. A first actuator 6 that moves the first mandrel 1 in the direction along the rotational axis X1 together with the main shaft motor M is disposed opposite to the first actuator 6 in the direction along the rotational axis X1, and the second mandrel 2 is The second mandrel 1 is moved from the one end side Wab to the second mandrel 1 from the other end side Wb in the work W disposed at a position having the rotation axis X1 as the axis. The mandrel 2 can be inserted or retracted in the concentric state.

  In the following description, the direction along the rotation axis X1 of the spindle motor M is defined as the X direction (the left-right direction in FIG. 1), and the spinning roller 3B (an example of the plastic working roller 3) is orthogonal to the X direction. The direction in which the workpiece W moves from the outer diameter side to the inner diameter side is the Y direction (vertical direction in FIG. 1), and the pressure roller 3A (an example of the plastic working roller 3) is orthogonal to the X direction and the Y direction. The direction of moving from the outer diameter side to the inner diameter side will be described as the Z direction (the front and back direction in FIG. 1).

Next, each part of the unequal thickness rim manufacturing apparatus will be described.
The first mandrel 1 is formed in a bottomed cylindrical shape, the base end side is connected to the main shaft and is configured to be driven and rotated by the main shaft motor M, and the insertion front end surface 1a (FIG. 3, FIG. 3) on the insertion front end side. 4) has a structure (not shown) that fits in a spigot while being in contact with the insertion tip surface 2a of the second mandrel 2, and the rotational driving force of the spindle motor M is passed through the first mandrel 1 to the second mandrel. 2 can be transmitted. Further, the proximal end side of the first mandrel 1 is supported in a rotatable state with respect to the first support member 8 connected to the distal end side of the first actuator 6. Thus, the first mandrel 1 is configured to be movable along the rotation axis X1 by the first actuator 6 and to be rotatable around the rotation axis X1 by the spindle motor M. In addition, the 1st actuator 6 is comprised by the hydraulic cylinder by which the base end side was fixedly supported by the mount frame (not shown), for example.

  On the other hand, the second mandrel 2 is formed in a bottomed cylindrical shape whose outer diameter is the same as the outer diameter of the first mandrel 1, and a second support member whose base end side is connected to the distal end side of the second actuator 7. 9 is supported in a rotatable state with respect to 9, and has a structure in which the insertion distal end surface 2a on the insertion distal end side is fitted with an inlay while being in contact with the insertion distal end surface 1a of the first mandrel 1. The first mandrel 1 It is set as the structure which can be driven rotated by the rotational drive force transmitted from. Accordingly, the second mandrel 2 is configured to be movable along the rotation axis X1 by the second actuator 7 and to be driven to rotate around the rotation axis X1. In addition, the 2nd actuator 7 is comprised by the hydraulic cylinder by which the base end side was fixedly supported by the mount frame (not shown), for example.

  In particular, as shown in FIGS. 3 and 4, a first annular recess 1 </ b> A having a reduced diameter on the inner diameter side is formed on the outer peripheral surface on the insertion tip side of the first mandrel 1. The cross-sectional shape of the first annular recess 1A is formed in a shape corresponding to the cross-sectional shape of a pressing roller 3A described later. In the present embodiment, the cross-sectional shape of the first annular recess 1A is an arc shape, that is, one point on the extension line of the insertion tip surface 1a that is biased from the outer peripheral surface of the first mandrel 1 to the outer diameter side (Y direction or Z direction). It is formed in a circular arc shape with a center circle. In the present embodiment, the curvature of the circle of the first annular recess 1A is set to 1/10 (radius is 10 mm).

  Similarly, a second annular recess 2A having a reduced diameter on the inner diameter side is formed on the outer peripheral surface on the insertion tip side of the second mandrel 2. The cross-sectional shape of the second annular recess 2A is formed in a shape corresponding to the cross-sectional shape of the pressing roller 3A described later. In the present embodiment, the cross-sectional shape of the second annular recess 2A is an arc shape, that is, one point on the extension line of the insertion tip surface 2a that is biased from the outer peripheral surface of the second mandrel 2 to the outer diameter side (Y direction or Z direction). It is formed in a circular arc shape with a center circle. Note that the curvature of the circle of the second annular recess 2A is appropriately set in consideration of the processing state of the next process, and is set to 1/10 (radius is 10 mm) in the present embodiment.

  Therefore, the first mandrel 1 is fitted and inserted from one end side Wa of the work W until the insertion tip surface 1a of the first mandrel 1 and the insertion tip surface 2a of the second mandrel 2 come into contact with each other. In the state where the mandrel 2 is inserted and inserted, an annular curved recess A is formed by the first annular recess 1A and the second annular recess 2A. In the contact state of both insertion tip surfaces 1a and 2a, the first annular recess 1A and the second annular recess 2A are symmetrical with respect to both insertion tip surfaces 1a and 2a, and the annular curved recess A is the first annular recess. It is formed with an arc having the same center as the center of the arc of 1A and the second annular recess 2A, and with the same curvature as the curvature of the first annular recess 1A and the second annular recess 2A. Note that, in the annular curved recess A in the present embodiment, the intersection of the annular curved recess A and both the insertion tip surfaces 1a and 2a is the most contracted portion.

As shown in FIG. 3 and FIG. 4, the starting shape of the workpiece W to be plastically processed by the unequal thickness rim manufacturing apparatus is uniform in the direction along the axial center direction (X direction) of the workpiece W. It is a straight tube and has a hollow cylindrical shape, and is made of a metal such as iron or aluminum. The inner diameter of the work W is formed to be approximately the same as or slightly larger than the outer diameter of the first mandrel 1 and the second mandrel 2 so that the first mandrel 1 and the second mandrel 2 can be fitted and inserted thereinto. Accordingly, the workpiece W is rotated integrally with the first mandrel 1 and the second mandrel 2 by operating the spindle motor M with the first mandrel 1 and the second mandrel 2 inserted into the workpiece W. Can do.
Note that the straight tubular hollow cylindrical workpiece W which is the object of plastic processing by the unequal thickness rim manufacturing apparatus has at least a substantially constant inner diameter and is formed as described above in the axial direction (X direction). ) Along the axial direction (X direction), the workpiece W may have a thickness slightly changed (the outer diameter slightly changed).

  As shown in FIGS. 1 and 2, as the plastic working roller 3, a pressing roller 3A that presses the outer peripheral surface Ws of the workpiece W from the outer diameter side to the inner diameter side, and the outer peripheral surface Ws of the workpiece W from the outer diameter side to the inner diameter side. And a pair of spinning rollers 3B that adjust the thickness of the workpiece W by being moved along the direction of the rotation axis X1 while being pressed.

  The pressing roller 3A and the pair of spinning rollers 3B are distributed in the circumferential direction of the work W. In the present embodiment, for example, as shown in FIGS. 6B and 7B, in the circumferential direction, Each spinning roller 3B is arranged with a phase shift of ± 90 degrees with respect to the pressing roller 3A. The spinning rollers 3B are arranged at positions facing each other in the Y direction (radial direction) with the rotation axis X1 of the first mandrel 1 and the second mandrel 2 interposed therebetween.

  As shown in FIGS. 2 and 5, the pressing roller 3 </ b> A is configured in a disk shape, and when the outer peripheral edge (tip surface) is pressed against the outer peripheral surface Ws of the rotating workpiece W, the pressing roller 3 </ b> A follows the workpiece W. And supported by the support base 10 so as to be rotatable around the rotation axis X2. The cross-sectional shape of the tip surface (pressing surface) of the pressing roller 3 </ b> A is formed in a shape corresponding to the cross-sectional shape of the annular curved concave portion A formed on the outer peripheral surface Ws of the first mandrel 1 and the second mandrel 2. In this embodiment, the cross-sectional shape of the pressing surface of the pressing roller 3A is an arc shape, that is, an arc-shaped pressing curved surface 3a having the same curvature as the curvature of the annular curved concave portion A (see FIG. 5A). . In the present embodiment, the curvature of the circle of the pressing curved surface 3a is set to 1/10 (radius is 10 mm). In addition, the pressing curved surface 3a of the pressing roller 3A in the present embodiment is a portion where the middle point in the direction along the rotation axis X2 is the largest diameter, and the width in the direction along the rotation axes X1 and X2 is annular. It is formed slightly larger than the width of the curved concave portion A.

  Further, the support 10 for supporting the pressing roller 3A is positioned in the X direction by the pressing roller moving mechanism 11 at a position facing the rotation axis X1 of the first mandrel 1 and the second mandrel 2 in the Z direction (radial direction). And Z direction can be reciprocally operated. The pressing roller moving mechanism 11 is fixedly supported on the gantry.

  As shown in FIGS. 1, 6, and 7, each spinning roller 3 </ b> B is configured in a disc shape, and when its outer peripheral edge (tip surface) is pressed against the outer peripheral surface Ws of the rotated workpiece W, the workpiece It is supported by the support base 12 so as to be able to rotate around the rotation axis X3 following W. The cross-sectional shape of the tip end surface (processed surface 3b) of the spinning roller 3B is formed in a substantially V-shape that is sharper than the pressing curved surface 3a of the pressing roller 3A (see FIGS. 6A and 7A). . In addition, the processing surface 3b of the spinning roller 3B in the present embodiment is a sharpened point where the center point in the direction along the rotation axis X3 is expanded most.

  In addition, a pair of support bases 12 that support the spinning roller 3B are disposed at positions facing each other in the Y direction (radial direction) with the rotation axis X1 of the first mandrel 1 and the second mandrel 2 interposed therebetween. A pair of spinning roller moving mechanisms 13 is provided so as to be freely reciprocated in the X direction and the Y direction. Each spinning roller moving mechanism 13 is fixedly supported on a gantry.

  Although not shown, the control unit 5 includes a CPU that is a known information calculation processing unit, a storage unit, and the like, and operates each device such as the spindle motor M, the pressing roller moving mechanism 11, and the spinning roller moving mechanism 13. Configured to control.

  Further, as shown in FIG. 8, the unequal thickness rim manufacturing apparatus is disposed in contact with one end Wa and the other end Wb in the axial direction (X direction) of the workpiece W. Are provided with a pair of knockout means 20 that can be pressed toward the center. The knockout means 20 of the present embodiment has an inner diameter that is approximately the same as the inner diameter of the workpiece W and is formed in a slightly larger diameter than the outer diameters of the first mandrel 1 and the second mandrel 2, and is divided into a plurality in the circumferential direction. The annular member is provided, and the annular member is pressed by a pressing mechanism (not shown) so that the workpiece W can be pressed to the center side from both ends Wa and Wb of the workpiece W, respectively.

  Next, using the unequal-thickness rim manufacturing apparatus having the above-described configuration, the control unit 5 controls each device so that the thickness of the workpiece W in the direction along the axis direction (X direction) is uniform. A method of manufacturing an unequal thickness rim that plastically processes the hollow cylindrical workpiece W so as to become an unequal thickness rim having an adjusted thickness will be described.

  First, as shown in FIG. 3, the first actuator 6 is extended and inserted into the work W arranged concentrically with the rotation axis X1 to insert the first mandrel 1 from one end side Wa, The second mandrel 2 is inserted into the second mandrel 2 from the other end Wb by extending the second actuator 7. At this time, the outer peripheral surfaces of the first mandrel 1 and the second mandrel 2 are guided by the first annular recess 1A and the second annular recess 2A having a diameter reduced toward the insertion tip side, so that the insertion is surely and easily performed. Is realized.

  As shown in FIG. 4, the spindle motor M is driven to rotate in a state in which the insertion tip surface 1a of the first mandrel 1 and the insertion tip surface 2a of the second mandrel 2 are in contact with each other until they are in contact with each other. The work W, the first mandrel 1 and the second mandrel 2 are integrally rotated around the rotation axis X1.

Next, as shown in FIGS. 5A and 5B, the pressing roller moving mechanism 11 is operated to move the pressing roller 3 </ b> A along the X direction to an annular curved surface on the outer peripheral surface Ws of the workpiece W in a rotating state. The pressure roller 3A is moved to a position corresponding to the concave portion A, and the pressing roller 3A is moved from the outer diameter side to the inner diameter side along the Z direction at the position, and the outer peripheral surface of the workpiece W at the position by the pressing curved surface 3a. Press Ws. The portion pressed by the pressing curved surface 3a (pressing portion Wp) is pressed while being sandwiched between the pressing curved surface 3a and the annular curved concave portion A, and the outer peripheral surface of the pressing portion Wp is plastic with the same curvature as the pressing curved surface 3a. The inner peripheral surface is plastically deformed to the same curvature as the annular curved concave portion A.
Thereby, the pressing portion Wp can be reliably and easily plastically deformed into a shape along the annular curved concave portion A, and can be securely held between the pressing curved surface 3a of the pressing roller 3A and the annular curved concave portion A. Therefore, even if the workpiece W tries to move along the X direction, the pressing portion Wp pressed by the pressing roller 3A on the workpiece W is securely locked to the annular curved concave portion A, and the pressing roller 3A and the annular curved concave portion A Since the clamping state is reliably maintained by clamping, the movement of the workpiece W along the X direction can be more reliably prevented.

Subsequently, as shown in FIG. 6 (b), the first mandrel is held as shown in FIGS. 6 (a) and 6 (b) while maintaining the pressing portion Wp sandwiched by the pressing curved surface 3a of the pressing roller 3A. The plastic working of the workpiece W corresponding to 1 is performed.
Specifically, the pair of spinning roller moving mechanisms 13 are operated to slightly move the pair of spinning rollers 3B toward the one end side Wa from the pressing portion Wp on the outer peripheral surface Ws of the workpiece W in a rotating state along the X direction. Move to a biased position. Then, the pair of spinning rollers 3B is moved from the outer diameter side to the inner diameter side along the Y direction at the position, and the outer peripheral surface Ws of the workpiece W at the position is pressed by the processing surface 3b of the spinning roller 3B. , And move to one end side Wa along the X direction.

Further, as shown in FIG. 7 (b), the second mandrel 2 as shown in FIGS. 7 (a) and 7 (b) is maintained with the pressing portion Wp held by the pressing curved surface 3a of the pressing roller 3A. The plastic working of the part of the workpiece W corresponding to is performed.
Specifically, the pair of spinning roller moving mechanisms 13 is operated to move the pair of spinning rollers 3B along the X direction to the other end side Wb of the outer peripheral surface Ws of the workpiece W in a rotating state from the pressing portion Wp. Move to a slightly biased position. Then, the pair of spinning rollers 3B is moved from the outer diameter side to the inner diameter side along the Y direction at the position, and the outer peripheral surface Ws of the workpiece W at the position is pressed by the processing surface 3b of the spinning roller 3B. , And move to the other end side Wb along the X direction.

  At the time of plastic working by such a pair of spinning rollers 3B, the movement amount, movement speed, pressing force, etc. in the Y direction and the movement amount, movement speed, pressing force, etc. in the X direction by the pair of spinning rollers 3B are as follows: The thickness is appropriately adjusted according to the shape of the unequal thickness rim having a desired thickness. Various conditions for this adjustment are appropriately stored in the storage unit of the control unit 5, and the control unit 5 is configured to automatically perform plastic working of the workpiece W based on the stored conditions. An unequal thickness rim in which the thickness of the workpiece W is adjusted is formed by the spinning roller 3B.

  In addition, the thickness of the workpiece W before and after the plastic working shown in each drawing represents an approximate thickness for easy understanding of the present invention, and indicates the thickness of the workpiece W actually plastic-worked. is not. For example, it can be formed thinner than the thickness of the workpiece W in the direction along the X direction, and the thickness of the workpiece W in the direction along the X direction is not substantially uniform. It can also be formed in any unequal thickness shape adjusted to a thickness (thickness having a thin part and a thick part).

Thereby, both ends from the position corresponding to the annular curved concave portion A in the axial direction (X direction) of the workpiece W while pressing the outer peripheral surface Ws of the workpiece W by the spinning roller 3B while maintaining the clamping state by the pressing roller 3A. Even if the workpiece W is moved to the side Wa and Wb, respectively, and the thickness of the workpiece W is adjusted, the workpiece W does not move along the axial direction (X direction), and high-precision plastic working can be performed. The movement of the workpiece W in the radial direction (Y direction or Z direction) is prevented by pressing from the outer diameter side to the inner diameter side by the pressing roller 3A and the spinning roller 3B. In other words, the outer peripheral surface Ws of the workpiece W by the spinning roller 3B is plastically processed using the workpiece W, which is a straight tubular hollow cylindrical ring having a uniform thickness, as a starting material, and the workpiece W is clamped by the pressing roller 3A. Accordingly, the thickness adjustment in the direction along the axial direction (X direction) can be performed up to both ends Wa and Wb of the workpiece W to produce an unequal thickness rim, and plastic processing is performed by the spinning roller 3B. Since it is no longer necessary to perform pressing before the rim, the unequal thickness rim can be manufactured quickly.
Therefore, in the unequal-thickness rim manufacturing apparatus according to the present invention, it is possible to reliably prevent the workpiece W from moving along the axial direction (X direction) at the time of plastic processing and to realize accurate plastic processing. The processing time can be shortened.

Then, as shown in FIG. 8, the pressing roller 3A and the pair of spinning rollers 3B are moved away from the outer peripheral surface Ws of the workpiece W, and the rotational drive of the spindle motor M is stopped, so that the pressing roller 3A and the spinning roller The plastic working of the workpiece W by 3B is terminated.
After that, as shown in FIGS. 8 and 9, annular knockout means 20 divided in the circumferential direction are disposed in contact with both ends Wa and Wb in the axial direction (X direction) of the workpiece W, respectively. The first mandrel 1 and the second mandrel 2 are withdrawn from the workpiece W by pressing the sides Wa and Wb toward the center side (the pressing portion Wp side pressed by the pressing roller 3A). Since the pressing roller 3A and the spinning roller 3B are configured to press the workpiece W from the outer diameter side to the inner diameter side, the pressed portions are the outer peripheral surfaces of the first mandrel 1 and the second mandrel 2, particularly the annular curved concave portion A. Even in such a case, the both ends Wa and Wb of the workpiece W are pressed to the center side by the knockout means 20, so that the first mandrel 1 and the second mandrel 2 are surely retracted. And can be done easily.

  Therefore, in the unequal-thickness rim manufacturing apparatus according to the present invention, a straight tube-shaped metal hollow cylindrical workpiece W is used as a starting material, and only plastic processing by the pressing roller 3A and the spinning roller 3B as the plastic processing roller 3 is performed. Further, it is possible to quickly and accurately manufacture a hollow cylindrical unequal thickness rim having a thickness adjusted appropriately.

[Another embodiment]
(A) In the above embodiment, the cross-sectional shape of the pressing curved surface 3a of the pressing roller 3A is formed in an arc shape having the same curvature as the annular curved concave portion A as an annular concave portion, but the cross-sectional shape corresponding to the annular concave portion is Other configurations may be employed as long as the workpiece W can be securely clamped and the workpiece W can be prevented from moving along the X direction.
(A-1) For example, as shown in FIG. 10, instead of the above-described pressing roller 3 </ b> A, a pressing roller 30 adopting a cross-sectional shape having a smaller curvature than that of the pressing roller 3 </ b> A and the annular curved concave portion A is used. You can also. In the pressing roller 30, the cross-sectional shape of the pressing curved surface 30a is the curvature of the cross-sectional shape of the annular curved concave portion A1 formed by the first annular concave portion 30A of the first mandrel 1 and the second annular concave portion 31A of the second mandrel 2. The curvature can be the same as 1/20 (radius is 20 mm). Note that the width of the pressing curved surface 30a of the pressing roller 30 in the direction along the rotation axes X1 and X2 is substantially equal to the width of the annular curved concave portion A1.
(A-2) For example, although not shown, a pressure roller that adopts a cross-sectional shape with a curvature larger than the curvature of the above-described pressure roller 3A and the annular curved concave portion A can also be used.
(A-3) For example, as shown in FIG. 11, instead of the above-described pressing roller 3A, a pressing roller 32 provided with a pressing surface 32a having a linear cross-sectional shape parallel to the rotation shafts X1 and X2 is used. You can also. In the pressing roller 32, the cross-sectional shape of the pressing surface 32a is linear corresponding to the cross-sectional shape of the annular recess B formed by the first annular recess 32B of the first mandrel 1 and the second annular recess 33B of the second mandrel 2. It can be made into the shape. In addition, the cross-sectional shape of the annular recess B is formed in a substantially rectangular shape.

(B) In the above-described embodiment, one pressing roller 3A is disposed at one place in the circumferential direction. However, a plurality of pressing rollers 3A may be used to be distributed in the circumferential direction. The roller 3 </ b> A may be arranged at a position facing the rotation axis X <b> 1 of the first mandrel 1 and the second mandrel 2. Further, in the above-described embodiment, the configuration in which plastic processing is performed by the spinning roller 3B while maintaining the clamping state by the pressing roller 3A has been described. However, when the plastic processing is performed by the spinning roller 3B, the pressing roller 3A is moved to the outer periphery of the workpiece W. The workpiece W may be configured to be moved away from the surface Ws and retracted and fixed to the annular curved concave portion A by the pressing portion Wp.

(C) In the above embodiment, the paired spinning rollers 3B are arranged with a shift of ± 90 degrees in the circumferential direction with respect to the pressing roller 3A. However, if the pressing roller 3A and the spinning roller 3B do not interfere with each other, the pressing roller 3B is pressed. The positions where the rollers 3A and the spinning rollers 3B are distributed in the circumferential direction can be changed as appropriate. At this time, the number of spinning rollers 3B can be appropriately changed.

(D) In the above embodiment, the portion corresponding to the first mandrel 1 in the workpiece W is plastically processed using the pair of spinning rollers 3B, and then the portion corresponding to the second mandrel 2 is plastically processed. Configured. However, the spinning roller 3B includes a first spinning roller corresponding to the first mandrel 1 and a second spinning roller corresponding to the second mandrel 2, and a portion corresponding to the first mandrel 1 of the workpiece W and It is also possible to perform a rapid plastic working by simultaneously performing the plastic working of the portion corresponding to the second mandrel 2. In this case, a pair of first spinning rollers may be disposed with the rotation axis X1 interposed therebetween, and a pair of second spinning rollers may be disposed with the rotation axis X1 interposed therebetween.

(E) In the above-described embodiment, a configuration is provided in which a pair of knockout means 20 are provided in contact with both ends Wa and Wb in the axial direction of the workpiece W and capable of pressing the both ends Wa and Wb toward the center. However, other configurations may be employed as long as the first mandrel 1 and the second mandrel 2 can be reliably and easily withdrawn from the work W.

(F) In the above-described embodiment, the main shaft to which the first mandrel 1 is coupled is configured to be rotationally driven by the main shaft motor M, and the first mandrel 1 and the second mandrel 2 are inserted into the work W, Although the work W is configured to rotate integrally with the first mandrel 1 and the second mandrel 2 by operating the spindle motor M that rotationally drives the spindle to which the first mandrel 1 is connected, the first mandrel 1 Further, both the second mandrel 2 and the second mandrel 2 may be provided with motors that can be driven to rotate.

  As described above, it is possible to provide an unequal-thickness rim manufacturing apparatus capable of reducing the processing time while reliably preventing the hollow cylindrical element ring from moving along the axial direction during plastic processing. it can.

1 First Mandrel 1a Insertion Tip Surface (First Mandrel)
1A First annular recess 2 Second mandrel 2a Insertion tip surface (second mandrel)
2A Second annular recess 3 Plastic processing roller 3A Press roller (plastic processing roller)
3a Pressing curved surface (pressing surface)
3B Spinning roller (plastic processing roller)
4 Rotation drive means 5 Control section (control means)
20 Knockout means A Annular curved concave part (annular concave part)
X1 Rotating shaft core (shaft core)
W Work (Hollow Cylindrical Ring)
Ws Outer peripheral surface Wa One end (end)
Wb The other end (end)
Wp pressing part (the part pressed by the pressing roller)

Claims (6)

Cylindrical first mandrel and second mandrel that can rotate around the same axis, a plastic processing roller that plastically processes a straight cylindrical hollow cylindrical element ring from the outer diameter side, and the first mandrel is fitted from one end side Rotation driving means for rotating the hollow cylindrical element ring, into which the second mandrel is inserted and inserted from the other end, is rotated relative to the plastic working roller, and control means for controlling operation. An apparatus for manufacturing unequal thickness rims,
A first annular recess having a reduced diameter on the inner diameter side is formed on the outer peripheral surface on the insertion tip side of the first mandrel, and a second annular recess having a diameter reduced on the inner diameter side on the outer peripheral surface on the insertion tip side of the second mandrel. In a state in which the first mandrel and the second mandrel are fitted and inserted into the hollow cylindrical element ring until the insertion tip surface of the first mandrel and the insertion tip surface of the second mandrel contact each other. An annular recess is formed by the first annular recess and the second annular recess,
As the plastic working roller, comprising a pressing roller having a pressing surface having a cross-sectional shape corresponding to the annular recess, and a spinning roller for adjusting the thickness of the hollow cylindrical element ring,
The control means moves the pressing roller from the outer diameter side to the inner diameter side at a position corresponding to the annular recess in the axial center direction of the hollow cylinder element ring rotated by the rotation driving means. By pressing the outer peripheral surface of the ring, the pressed portion is plastically deformed into a shape along the annular recess, and is clamped between the pressing roller and the annular recess,
Further, the control means moves the spinning roller from the outer diameter side to the inner diameter side while pressing the outer peripheral surface of the hollow cylindrical element ring while maintaining the sandwiched state, while pressing the outer peripheral surface of the hollow cylindrical element ring. An unequal-thickness rim manufacturing apparatus that adjusts the thickness of the hollow cylindrical element ring by moving in a direction that approaches the end from a position corresponding to the annular recess in the direction.   The annular recess is formed as an annular curved recess having a curved cross section, and the pressing surface of the pressing roller is formed as a pressing curved surface having a curved cross section. The curvature of the annular curved recess and the curvature of the pressing curved surface And the unequal thickness rim manufacturing apparatus according to claim 1.   When the control means adjusts the thickness of the hollow cylindrical element ring by the spinning roller, the spinning roller presses the outer peripheral surface of the hollow cylindrical element ring, and in the axial direction of the hollow cylindrical element ring. The unequal thickness rim manufacturing apparatus according to claim 2, wherein the apparatus is moved from a position corresponding to the annular recess to an end.   After the plastic working by the pressing roller and the spinning roller is completed, a pair of knockout means are provided that are in contact with both ends in the axial direction of the hollow cylindrical element ring and can press the both ends toward the center. The unequal thickness rim manufacturing apparatus according to claim 2 or 3.   5. The non-rotation according to claim 2, wherein the spinning roller is configured by a first spinning roller corresponding to the first mandrel and a second spinning roller corresponding to the second mandrel. Equipment for producing equal thickness rims.   The unequal thickness according to any one of claims 2 to 5, wherein the spinning rollers are arranged in pairs at positions facing each other in a radial direction across the first mandrel or the second mandrel. Rim manufacturing equipment.

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