JP2004202531A - Spinning device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To appropriately form a necking part under a state having at least one relation among an eccentricity, an inclination and a twist to the barrel of a workpiece by spinning work, while positively holding the barrel of the workpiece. <P>SOLUTION: The necking part under a state having at lease one relation among an eccentricity, an inclination and a twist to the barrel of a workpiece 4 is formed at the end part of the workpiece using a spinning working device 1. In this case, a clamping means has three or more segments which approach to or are separated from the center axis of the workpiece and hold the barrel of the workpiece when approach. The surface on the center axis side of each segment workpiece is formed so as to match the outer peripheral face of the barrel of the workpiece. Alternatively, the clamping means can have at least one fixing segment to be fixed to a support of two supports to the workpiece, and a plurality of movable segments which movably support two supports respectively and move to the direction of the center axis of the workpiece, interlinked with the movement of the fixing segment to the direction of the center axis of the workpiece. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a spinning apparatus, and more particularly, to a spinning apparatus suitable for performing necking on an end of a metal tubular workpiece after sizing the body of the tubular workpiece.
[0002]
[Prior art]
Patent Document 1 (Japanese Patent Application Laid-Open No. 2001-25826) discloses a spinning apparatus capable of forming a necking part having at least one of eccentricity, inclination, and twist with respect to a body of a metal tubular workpiece. A plurality of target processing parts are set from a non-processing part of the work to a final target processing part having a central axis that is at least one of eccentricity, inclination and torsion with respect to the central axis of the non-processing part. A plurality of processing target axes are set based on the plurality of target processing units, and the work is supported such that one of the plurality of processing target axes and a central axis of a processing target part of the work are substantially coaxial. Then, while making the center axis of the processing target portion coincide with each processing target axis of the plurality of processing target axes, performing spinning processing so as to change the diameter of the processing target portion in each processing target axis, Addition Molding the target portion, different diameter forming method and apparatus of the workpiece is disclosed to form the final target processed portion shape.
[0003]
Patent Document 2 (Japanese Unexamined Patent Application Publication No. 2002-18539) discloses that a pipe to be processed is gripped by a gripping mechanism, and a drawing tool is mounted on a rotary spindle. The drawing tool is mounted on the table so as to be able to shift in the radial direction, whereby the drawing tool is shifted in the radial direction to perform the drawing, and at the same time, the tip of the pipe to be processed is turned to a predetermined angle using a turning means. Thereby, the drawing process can be performed by inclining the tip of the pipe at a predetermined angle with respect to the pipe axis. " In addition, "the pipe gripping mechanism for processing is provided with a shifting means for displacing the center line of the pipe to be supported with respect to the center axis of the main shaft, and a rotating means for rotating by a predetermined angle. By the operation, the pipe tip can be held at a required angle with respect to the machining axis when drawing the pipe tip. "
[0004]
On the other hand, Patent Document 3 (Japanese Unexamined Patent Application Publication No. 2002-178045) states, "The conventional method for manufacturing a catalytic converter requires a press device and a spinning machine.
For this reason, the equipment cost increases and the installation area of each device is required. In addition, there was a problem that the work had to be attached to and removed from the press device and the spinning machine, and the work had to be transported from the press device to the spinning machine, resulting in a reduction in manufacturing efficiency. '' ing. On the other hand, `` in the catalytic converter spinning machine, the machine body, facing the main shaft, is disposed in a state where the axis is substantially aligned with the axis of the main shaft, the holding cylinder supported by the main shaft, And press-fitting means for pressing the catalyst carrier having the holding material attached to the outer periphery in the axial direction to press-fit the catalyst carrier. " The main shaft 52 is rotatably provided with a main shaft 53 whose axis is directed to the other end in the horizontal direction. The main shaft 53 is rotationally driven by a drive source (not shown) such as a motor. A four-claw or three-claw collet chuck 54 is provided at the tip of the main shaft 53. The collet chuck 54 fits the holding cylinder 2 (material 2 '). The outer periphery of the part 21 is clamped in a fixed state. "
[0005]
Patent Document 4 (Japanese Unexamined Patent Application Publication No. 11-58109) discloses a method of clamping a work, which discloses that in a collet chuck for a machine tool capable of holding and detaching a work 1, a work insertion penetrating into a main body housing 2 on both front and back surfaces thereof. A ring-shaped slotted fastener 4 is formed in the work insertion hole 3 for forming the hole 3 and capable of holding the outer peripheral surface of the work 1 inserted into the work insertion hole 3. A slide member 5 is provided between the slide members 5, and the slide member 5 is slidable in the axial direction in the work insertion hole 3. When the slide member 5 is slid to one side, the outer peripheral surface of the clamp 4 is tightened inward. The inner work 1 can be pinched, and the tightening can be released when sliding to the other side. "
[0006]
Patent Document 5 (Japanese Patent Application Laid-Open No. 2002-224923) discloses "In a pipe clamp device for receiving, fixing, and holding a pipe in a circular hole formed by an upper and lower frame, a rod is circularly formed around the circular hole of the upper and lower frames. It comprises a plurality of fluid cylinders radially arranged towards the center of the hole and a moving means for moving these fluid cylinders in the radial direction of the cylindrical hole. "
[0007]
Further, Patent Document 6 (Japanese Patent Application Laid-Open No. H6-71560) discloses that “a claw that can be opened and closed by contact with a cam in accordance with a change in a sliding position of a rod provided with a symmetrical cam has a work having a different diameter together with the rod. An automatic centering steadying unit which is configured to be able to concentrically grasp the same is disclosed. As the prior art, an automatic centering mechanism having a similar configuration disclosed in Patent Document 7 (Japanese Patent Publication No. 47-29836) is disclosed. Is quoted.
[0008]
[Patent Document 1]
JP 2001-25826 A
[Patent Document 2]
JP-A-2002-18539
[Patent Document 3]
JP 2002-178045 A
[Patent Document 4]
JP-A-11-58109
[Patent Document 5]
JP-A-2002-224923
[Patent Document 6]
JP-A-6-71560
[Patent Document 7]
Japanese Patent Publication No. 47-29836
[0009]
[Problems to be solved by the invention]
In the apparatuses described in Patent Documents 1 and 2, the work is gripped by a clamp device that moves on a horizontal plane and rotates around a vertical axis, and spinning is performed while adjusting the relative positional relationship between the work and the spinning roller. It is configured to perform processing. Therefore, it is necessary to securely grip the work by the clamp device. In particular, when forming the above-mentioned necking portion by spinning with respect to the end portion of the work having the body processed as described below, the gripping state of the work is an important issue.
[0010]
With regard to recent automotive exhaust system components such as catalytic converters and diesel particulate filters (DPFs), metal components are inserted after inserting them in order to firmly hold the built-in catalyst carriers or filters (hereinafter referred to as carriers). A so-called sizing method is being adopted as a method of compressing the cushioning member by reducing the diameter of the portion of the cylindrical work. As this sizing method, for example, based on a material error between the carrier, the mat and the outer cylinder, a diameter reduction amount that generates an optimum surface pressure is set, and the carrier holding portion of the outer cylinder is set to have the diameter reduction amount. It is desirable to reduce the diameter. As a result, there is an individual difference (about several mm in a normal catalytic converter) in the outer cylinder diameter after sizing.
[0011]
Further, in order to form a joint between the exhaust system component and a joining target, necking is usually performed on at least one end, and spinning is suitable as a processing method. However, when spinning is performed on the end of the work after the sizing, the body (usually, the center) of the work is gripped by the clamp device, and this part is sized as described above. The processing results in individual differences in the outer diameter. A general clamping device is constituted by upper and lower split dies, each of which has a semi-cylindrical holding surface, but it is difficult to follow a diameter difference of several mm. As a result, a gap is generated between the workpiece and the outer surface of the body due to a difference in curvature, and the contact area is reduced, so that the gripping force is reduced.
[0012]
In this regard, in the conventional work-fixed coaxial spinning, only the rotation and the axial movement of the work need to be prevented, so that the above-described clamping device can be appropriately gripped during necking. On the other hand, as described above, in the spinning process for forming at the end of the workpiece a necking portion that is at least one of eccentricity, inclination, and twist with respect to the body of the workpiece, Since bending and shearing forces also act, a larger gripping force is required compared to coaxial spinning.
[0013]
However, according to the spinning apparatus provided with the conventional clamping device including the clamping device described in the above-mentioned patent document, the body portion of the sizing-processed work is securely held, and the It is extremely difficult to properly form a necking portion having at least any one of the relations of eccentricity, inclination, and twist at the end of the work. For example, Patent Document 3 mentioned above relates to a work fixed type coaxial spinning process, in which the outer end of a holding cylinder is clamped by a four-claw or three-claw collet chuck at an end opposite to a processed portion of a work. However, these claws are in line contact, and the contact area for grasping is still insufficient. Although it has the same centering function as a vertical split type clamp device, it cannot automatically follow the diameter difference of the work. Furthermore, since it is basically an end support type and cannot penetrate the collet chuck to grip the body of the work, a step change is required when necking is performed on both ends of the work. Even if such a conventional clamping device is applied to a conventional spinning device, the above problem cannot be solved.
[0014]
Also, in the automatic centering mechanisms disclosed in Patent Documents 6 and 7 described above, there is a description that the work is grasped by three claws (a roller in Patent Document 7). These claws (or rollers) are also in line contact, and in the spinning process for forming a necking portion at least one of eccentricity, inclination, and twist at the end of the work with respect to the body of the work, It is not possible to secure a contact area for securely gripping the work.
[0015]
Accordingly, the present invention provides a necking portion that is at least one of eccentricity, inclination, and twist with respect to the body while securely gripping the body of the sizing-processed work. It is an object of the present invention to provide a spinning apparatus which can appropriately form the end of a work by spinning.
[0016]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention provides, as described in claim 1, a clamping means for gripping a metal tubular work to be machined, and a spinning process for an end of the work gripped by the clamping means. Processing means for performing, and a drive control means for performing a spinning process by the processing means on the end of the work by relatively displacing the clamping means with respect to the processing means, at least with respect to the body of the work In a spinning apparatus for forming a necking portion having any one of eccentricity, inclination, and torsion at an end of the work, the clamping means may move the work piece close to and away from an axis of the work piece. A curved surface that fits the outer peripheral surface of the torso of the work, comprising three or more segments that grip the torso of It is obtained by forming.
[0017]
In the spinning apparatus according to the first aspect, as described in the second aspect, the spinning apparatus can move on a plane parallel to the axis of the work and can rotate around an axis perpendicular to the axis of the work. It is good to arrange.
[0018]
Further, in the spinning apparatus according to claim 1 or 2, the clamp means includes at least two support members which are close to and separated from each other and grip the body of the work when the clamp members are close to each other. At least one fixed segment that is fixed to one of the two supports, moves radially with the support and approaches and separates from the axis of the workpiece, and moves with respect to each of the two supports. Movably in the radial direction together with the two supports to move toward and away from the axis of the work, and at least in conjunction with the movement of the fixed segment in the axial direction of the work, the work A plurality of movable segments that move in the axial direction of the workpiece, and the surfaces of the movable segment and the fixed segment on the axis side of the work are formed on the outer periphery of the body of the work. It may be formed to fit a curved surface to.
[0019]
In the spinning apparatus according to the third aspect, as described in the fourth aspect, the two supports are vertically divided with respect to a plane including an axis of the work as a center. It may be composed of two members, and the two members may be disposed so as to approach and separate from each other. In this case, a single driving unit for relatively driving the two members is provided, and the two members are driven by the driving unit so as to approach and separate from each other. Good to do. Further, as set forth in claim 6, it is possible to configure so that a relative driving direction of the two members and a rotation axis of the support are parallel.
[0020]
Further, in the spinning apparatus according to the third aspect, as in the seventh aspect, there is provided an urging means for urging the plurality of movable segments to return to a predetermined retracted position, When the plurality of movable segments are moved in the axial direction of the work against the urging means, the at least one fixed segment and the plurality of movable segments form an inner cylindrical surface having a substantially circular cross section. Can be configured.
[0021]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. First, an overall configuration of a spinning apparatus according to an embodiment of the present invention will be described with reference to FIG. The final product of the present embodiment is supplied to, for example, a catalytic converter (not shown) for an automobile. In this spinning apparatus, a catalyst carrier (not shown) is housed as a part of the manufacturing process. Then, a metal tubular work 4 (hereinafter simply referred to as a work 4) whose body is reduced in diameter by so-called sizing is to be processed, and a necking portion is formed on at least one end thereof.
[0022]
As shown in FIG. 1, a spinning apparatus according to the present embodiment includes a spinning apparatus 1 serving as a processing unit for performing spinning processing on one end of a work 4 to be processed on a base BS, and a body of the work 4. A clamp device 2 serving as a clamping means for gripping a part and a chuck device 3 arranged on the other end side of the work 4 for attaching and detaching the work 4 to and from the clamp device 2 are arranged in parallel. Then, in accordance with the control by the controller CT as the drive control means, the clamping device 2 is relatively displaced with respect to the spinning device 1 to perform spinning processing on the end of the work 4 by the spinning device 1. A necking portion (for example, the right side of the work 4 in FIG. 9) which is at least one of eccentricity, inclination, and twist with respect to the body portion is formed at an end of the work 4. The spinning device 1 is configured to be movable along the X-axis (the left-right direction in FIG. 1), and is configured such that a necking portion is formed at an end of the work 4 by three rollers RL. Its structure is the same as that of the device described in the above-mentioned Patent Document 1, and its description is omitted. Note that a mandrel MA formed so as to conform to the shape of the inside of the open end of the work 4 is arranged coaxially with the main axis of the spinning device 1 shown by a dashed line in FIG.
[0023]
As shown in FIG. 1, a horizontal drive device 5 and a rotary drive device 6 are provided on a base BS, and the clamp device 2 is fixed on the rotary drive device 6. As shown in FIGS. 1 to 3, the clamp device 2 includes an upper clamp member 10 and a lower clamp member 20 that approach and separate from each other and grip the body of the work 4 when approaching each other. The work 4 is supported so as to be movable on a plane parallel to the axis of the work 4, and is supported by the rotation drive device 6 so as to be rotatable around an axis perpendicular to the axis of the work 4.
[0024]
In the horizontal driving device 5, a table 5a is movably arranged along a pair of Y-axis guide rails 5b (perpendicular to the X-axis) fixed on the base BS. A ball socket (not shown) is fixed to a lower portion of the table 5a, and a ball screw (not shown) screwed thereto is disposed in parallel with the Y-axis guide rail 5b, and is rotatable by a servomotor MT. Supported. Thus, when the ball screw is driven to rotate by the servomotor MT, the table 5a is configured to move along the Y axis.
[0025]
The rotation driving device 6 is provided on the table 5a, and is configured to be able to rotationally drive the table 6a about an axis perpendicular to the base BS, that is, the Z axis. As shown in FIGS. 2 and 3, a U-shaped frame 7 composed of two members is fixed on the table 6a, and an upper clamp member 10 is supported on the upper member so as to be able to move up and down. Is fixed to the lower clamp member 20. The upper clamp member 10 is supported by the upper member of the frame 7 via the rod 8, and when the upper clamp member 10 descends from the state shown in FIG. The workpiece 4 is configured to be gripped by the user. The gripping structure will be described later in detail.
[0026]
For example, a hydraulically driven cylinder 9 is fixed to the upper member of the frame 7, and the upper clamp member 10 is configured to be driven up and down via a rod 8 by the cylinder 9. At the time of removal, the upper clamp member 10 is driven upward as shown in FIG. Further, as described above, the chuck device 3 is disposed at a position facing the spinning device 1 via the clamp device 2. The chuck device 3 is supported by the horizontal driving device 5 so as to be able to move together with the horizontal driving device 5 and to be close to and away from the clamping device 2. The horizontal drive device 5, the rotary drive device 6, the cylinder 9 of the clamp device 2, and the servomotor MT constituting the drive mechanism (not shown) of the spinning device 1 and the chuck device 3 are drive-controlled by the controller CT. It is configured to be.
[0027]
The upper clamp member 10 and the lower clamp member 20 are configured as shown in FIGS. 6 and 7 show cross sections taken along line AA of FIG. 4, but hatching is omitted for convenience of explanation. First, the upper clamp member 10 is configured to be fixed to the upper support 11 and to move in the radial direction (upward in the drawing) together with the upper support 11 so as to approach and separate from the axis of the work 4. Fixed segment 12 is provided. Further, it is movably supported by the upper support 11, moves in the radial direction (upward in the drawing) together with the upper support 11, approaches and separates from the axis of the work 4, and at least moves the work 4 of the fixed segment 12. A plurality of (four in the present embodiment) movable segments 13 to 16 are configured to move in the axial direction of the workpiece 4 in conjunction with the movement in the axial direction. The upper movable segments 13 and 14 extend downward, and the inner surfaces thereof have the extending portions 13a and 14a abutting on the outer surfaces of the lower movable segments 23 and 24, and the members 13b and 14b constituting the clamp surfaces are inward. It is fixed to.
[0028]
Similarly, the lower clamp member 20 is fixed to the lower support 21 and the lower support 21, and moves together with the lower support 21 in the radial direction (downward in the drawing) to move toward and away from the axis of the work 4. The movable segment 22 is configured so as to be movable with respect to the lower support 21, and moves in a radial direction (downward in the drawing) together with the lower support 21 so as to be close to and closer to the axis of the work 4. A plurality of (four in the present embodiment) movable segments 23 to which are separated and move in the axial direction of the work 4 at least in conjunction with the movement of the movable segment 22 in the axial direction of the work 4 26. The movable segments 23 and 24 have members 23b and 24b constituting a clamp surface fixed to the inside.
[0029]
Adjacent ones of the segments 12 to 16 and 22 to 26 are mutually locked by slide bolts (indicated by JT in FIG. 6) to prevent the segments from falling off and to apply a biasing force in the radially expanding direction. A return spring (indicated by BM in FIG. 6) is provided so as to give the. The surface of the movable segment and the fixed segment on the axis side of the work 4 is formed into a curved surface conforming to the outer peripheral surface of the body of the work 4. Thus, a curved surface of the movable segment and the fixed segment forms a semi-cylindrical clamp surface on the lower surface of the upper clamp member 10 and a semi-cylindrical clamp surface on the upper surface of the lower clamp member 20. When the work 4 is gripped between these clamp surfaces, the work 4 is held so as not to rotate and move. As shown in FIGS. 4 and 5, an upper panel 17 and a lower panel 27 are mounted on both side surfaces of the upper clamp member 10 and the lower clamp member 20, respectively.
[0030]
As described above, the upper clamp member 10 and the lower clamp member 20 include the fixed segment 12 fixed to the upper support 11 and the movable segments 13 to 16 and 22 to 26 movably supported. In each of the members, each segment forms a face-to-face pair, particularly a sliding pair (in this regard, the segments can be called cams). When the upper clamp member 10 is driven upward by the cylinder 9 via the rod 8, the movable segments 13 to 16 are returned by the gravity and the urging force of the return spring BM, and as shown in FIG. A gap is formed between the segments. At this time, also in the lower clamp member 20 fixed to the frame 7, the movable segments 23 to 26 are returned to the return position by the urging force of the return spring BM, and a gap is formed between the segments as shown in FIG. It is in a state. In this state, when the work 4 is placed on the clamp surface of the lower clamp member 20, the state shown in FIG. 3 is obtained.
[0031]
When the upper clamp member 10 is driven downward by the cylinder 9, first, as shown in FIG. 6, the inner surfaces of the extending portions 13 a and 14 a of the movable segments 13 and 14 are moved to the movable segments 23 and 24 of the lower clamp member 20. , And is further driven downward (driven in the direction of the white arrow in FIG. 6) in this state. Thereby, the movable segments 13 to 16 and 22 to 26 move in the direction of the axis of the work 4 (the point where the dashed line in FIG. 6 intersects), that is, the centripetal direction. Further, when the movable segments 13 and 14 are driven in the directions of the outlined arrows in FIG. 7 and come into contact with the upper end surfaces of the movable segments 23 and 24, respectively, the gripping state shown in FIGS. Omitted).
[0032]
Thus, a substantially cylindrical clamp surface is formed by the inner surfaces of the segments, and the outer peripheral surface of the body of the work 4 is pressed by the clamp surface (the inner surface of each segment). In this case, it is desirable that the inner diameter of the clamp surface formed by the inner surfaces of the segments be set to the median value of the outer diameter of the body of the sized work 4. The median value may vary as a result of sizing of the body of the work 4 as a result of the sizing of the body, and the median value at that time may be used as an ideal value. Thereby, even when the diameter of the outer peripheral surface of the body of the work 4 varies to some extent, the clamp surface constituted by the segments can be adapted to the outer peripheral surface of the body of the work 4. Surface contact can be maintained.
[0033]
In this way, the work 4 is centered by the clamp device 2, and its axis coincides with the main axis (machining center axis) of the spinning device 1 and coincides with the outer diameter of the body (sizing portion) of the work 4. The workpiece 4 is in a gripping state, and the workpiece 4 is securely gripped. That is, even if a workpiece (or a tube material) having a different outer diameter is automatically adjusted so as to be in close contact with its outer periphery (that is, while being aligned), it is tightened in the centripetal direction by each segment, and firmly. Is gripped. In the present embodiment, since the curvature of the inner surface of each segment is non-variable, it cannot exactly follow the difference in diameter of the body of the work 4. Compared with the fastening by the surface, in the present embodiment, since the fastening is performed in the centripetal direction by the inner surface (curved surface) of the ten segments, the contact area with the work 4 is remarkably large, and the force in all directions can be opposed. In addition, it is possible to secure a remarkably large gripping force as compared with the related art. Therefore, the spinning process for forming a necking portion at least one of eccentricity, inclination, and torsion with respect to the body of the work 4 at the end of the work 4, which is the object of the present invention, is sufficient. It is possible to reliably cope with a large gripping force.
[0034]
In addition, since the mounting space of the work 4 is formed between the upper clamp member 10 and the lower clamp member 20 when the upper clamp member 10 is lifted, the work 4 (or the processed product) can be easily attached and detached, and good work can be performed. Efficiency can be ensured. In addition, the single driving means of the cylinder 9 allows the cylinder 9 to be gripped as described above only by being driven in one direction, which is effective in terms of equipment cost, weight, space, and reliability.
[0035]
On the other hand, the chuck device 3 of the present embodiment is the same as the device described in Patent Document 1 described above, and can move radially toward the center coaxial with the main axis of the spinning device 1 as shown in FIG. A pair of chucks 3a are provided, and the workpiece 4 is held by the chucks 3a, and is rotated around its axis to perform indexing. The chuck device 3 is provided so as to be able to advance and retreat with respect to the clamp device 2 along a rail 3b arranged parallel to the main axis of the spinning device 1. Note that an electric motor (not shown) is used as this driving means, and is controlled by the controller CT as part of the spinning processing as described above.
[0036]
FIG. 9 shows that, after spinning is performed on one end of the work 4 and a necking portion inclined with respect to the body of the work 4 is formed, the chuck 3a moves outward and the holding of the work 4 is released. The state where the chuck device 3 has retreated along the rail 3b is shown. From this state, the clamp device 2 is rotationally driven by the rotation driving device 6, and the work 4 returns to the original position coaxial with its axis as shown in FIG. Then, the roller RL returns to the original position on the right side in FIG. 10 along the main axis. Subsequently, the upper clamp member 10 of the clamp device 2 is driven up to be in the unclamped state shown in FIG.
[0037]
Next, as shown in FIG. 11, the chuck device 3 is driven forward along the rail 3b, and the other end of the work 4 is held by the chuck 3a. Then, the chuck device 3 is driven to rotate around the axis of the work 4 together with the work 4 to perform indexing. That is, when the work 4 is rotationally driven by a predetermined rotation angle, the upper clamp member 10 is driven to descend, and the work 4 is gripped between the upper clamp member 10 and the lower clamp member 20. Thereafter, the chuck device 3 is driven backward to the left in FIG. When the axes of both ends of the work 4 are in the same plane, no indexing is performed, and only the following reversing operation is performed.
[0038]
From the above state, when the work 4 is driven to rotate about 180 ° about a vertical axis (an axis perpendicular to the paper surface of FIG. 11) while the work 4 is held by the clamp device 2, the work 4 becomes as shown in FIG. The state is reversed. At this time, if necessary, a trimming process is performed on the end after the spinning by a cutting device (not shown) mounted on the spinning device or disposed adjacent to the spinning device, and the trimmed portion is perpendicular to the axis. An opening end surface (not shown) is formed. Then, in the state shown in FIG. 12, spinning is performed on the other end (the right side in FIG. 12) of the work 4 to form a necking portion inclined with respect to the body. Thereafter, the gripping state by the clamp device 2 is released, and the processed work 4 (product) is taken out.
[0039]
Thus, according to the present embodiment, it is possible to continuously form a necking portion by spinning at both ends of the work 4 in one process, so that the processing time is shorter than the conventional individual processing at both ends. It can be greatly reduced. Furthermore, if the chuck device 3 is configured to be rotatable (movable) along with the workpiece 4, the indexing can be performed without returning to the original position (FIG. 10), so that the processing time can be further reduced. . If an indexing mechanism such as the chuck device 3 is added to the clamp device 2, it is not necessary to provide a separate chuck device 3, and the device can be simplified and the processing time can be further reduced.
[0040]
In the above embodiment, the spinning device 1 is driven along the X axis and the work 4 is driven along the Y axis, so that the two move relatively on the horizontal plane. However, the spinning device 1 may be fixed on the base BS, and the work 4 may be driven along the X axis and the Y axis. That is, the horizontal and rotary driving means may be concentratedly arranged in the area shown in FIG. Further, the height of the work 4 from the base BS may be made variable so that the work 4 can be adjusted in the vertical direction with respect to the main axis of the spinning device 1. In addition, when the roller RL is arranged so as to be in contact with the inner surface of the work 4 during the spinning process, an enlarged portion (not shown) having an enlarged end portion can be formed. It is not limited to being coaxial with respect to the body, and at least one non-coaxial of eccentricity, inclination and torsion can be formed.
[0041]
As the clamping means of the present invention, a clamp device 100 shown in FIG. 13 may be used instead of the clamp device 2 described above. The clamp device 100 includes, for example, an automatic centering mechanism similar to the automatic centering and steadying unit described in Patent Document 6, and includes three segments 104, 105, and 106 for gripping the body of the workpiece 4. The surface of each segment on the axis side of the work 4 (indicated by a two-dot chain line in FIG. 13) is formed into a curved surface that fits the outer peripheral surface of the body of the work 4.
[0042]
As shown in FIG. 13, in the clamp device 100, a U-shaped frame 101 is fixed on a table 6 a of the rotary drive device 6, and a pair of arms 110 and 120 support support shafts 111 and 121 on both legs. Each is swingably supported at the center. Further, a rod 102 and a frusto-conical cam member 103 fixed thereto are interposed between the arms 110 and 120, and rollers 112 and 122 attached to lower ends of the arms 110 and 120 are cam members. It is arranged so as to abut on the side surface (cam surface) of 103. Springs 113 and 123 are provided between the arms 110 and 120 and the cam member 103, and the rollers 112 and 122 are pressed against the side surfaces of the cam member 103 by the urging force.
[0043]
On the other hand, a segment 104 is fixed to the upper end surface of the rod 102, and segments 105 and 106 are supported on the upper ends of the arms 110 and 120 so as to be swingable about support shafts 107 and 108, respectively. The inside of each of the segments 104 to 106 (on the side of the axis of the work 4) is formed into a curved surface so as to be in surface contact with the outer peripheral surface of the body of the work 4. The rod 102 is configured to be driven up and down by a cylinder or a motor (not shown). When the rod 102 is driven up and down, the workpiece 4 is gripped by the segments 104 to 106 as shown in FIG. Is configured. When the rod 102 is driven downward, the upper portions of the arms 110 and 120 expand outward, so that the work 4 can be easily taken out.
[0044]
As described above, in the above-described embodiment, since the spinning device including the clamp device 2 or 100 is configured, the diameter of the workpiece 4 is reduced due to sizing or the like and a difference in diameter occurs in the body portion. Even when the spinning process is appropriately performed, a necking portion having at least any one of the relations of eccentricity, inclination, and twist can be surely formed. The clamping means is not limited to the above-described clamping devices 2 and 100, and other devices may be used as long as they have the same function as the above-described gripping function by the segments. For example, if a vertical split type is not desired as the clamping means, a penetrating collet chuck as disclosed in Patent Document 4, for example, may be used, but the workability and the gripping force are inevitably reduced.
[0045]
Also, a predetermined shape such as a character, a symbol, or a pattern is provided on the contact surface of the above-mentioned segment (12 or the like) with the work 4 in the clamp means, and when the work 4 is gripped, the character 4 , Symbols, patterns, etc., may be embossed (transferred). As a result, it is possible to reliably stamp not only the product number and the manufacturer but also the traceability information (traceable information) on the product (work) without providing a separate process. It should be noted that the final product is not limited to exhaust system parts of automobiles, and can be applied to various fluid processing devices such as a reformer for a fuel cell.
[0046]
【The invention's effect】
Since the present invention is configured as described above, the following effects can be obtained. That is, in the spinning apparatus according to the first aspect, by configuring the clamping means as described in the first aspect, a sufficient gripping force can be applied to the body of the sizing-processed work. Accordingly, the necking portion having at least any one of the eccentricity, the inclination, and the torsion with respect to the body can be appropriately formed by spinning at the end of the workpiece while securely gripping the body.
[0047]
Further, if the clamping means is arranged so as to be movable on a plane parallel to the axis of the workpiece and rotatable about an axis perpendicular to the axis, it is easy and convenient. The workpiece can be quickly held at a predetermined position.
[0048]
If the clamping means is configured as described in claim 3, at least one fixed segment fixed to one of at least two supports and a plurality of movable segments interlocked with the fixed segment can sufficiently cover the body of the work. It is possible to reliably grip with a great gripping force. Further, the supporting member constituting the clamping means is constituted by two members divided in a direction perpendicular to the surface around the surface including the axis of the work as described in claim 4, Are arranged so as to approach and separate from each other, the work can be more easily and quickly gripped.
[0049]
Further, according to the structure as described in claim 5, since the work can be securely gripped by the two members only by driving in one direction by a single driving means, a simple and inexpensive device can be easily used. In addition, the workpiece can be quickly held. If the relative drive direction of the two members and the rotation axis of the support are parallel to each other, a compact device can be obtained.
[0050]
Further, in the spinning apparatus according to the third aspect, if configured as in the seventh aspect, the movable segment of the clamp means can be returned to a predetermined retracted position by the urging means, and the plurality of movable segments can be returned. Since the inner cylindrical surface having a substantially circular cross section is formed as the work moves in the axial direction of the work, the contact area with the work is large, and the force in all directions can be countered. Therefore, it is possible to reliably cope with a sufficient gripping force at the time of spinning processing for forming a necking portion having at least one of eccentricity, inclination, and twist with respect to the body portion of the work at the end of the work. it can.
[Brief description of the drawings]
FIG. 1 is a front view showing a part of a spinning apparatus according to an embodiment of the present invention.
FIG. 2 is a side view showing a gripping state of the clamp device provided in one embodiment of the present invention.
FIG. 3 is a side view showing a standby state of the clamp device according to the embodiment of the present invention.
FIG. 4 is a side view showing an upper clamp member and a lower clamp member in a gripped state in the clamp device according to the embodiment of the present invention.
FIG. 5 is a front view showing an upper clamp member and a lower clamp member in a gripping state in the clamp device according to the embodiment of the present invention.
FIG. 6 is a sectional view showing a state of each segment of an upper clamp member and a lower clamp member in a retracted state in the clamp device provided in one embodiment of the present invention.
FIG. 7 is a cross-sectional view taken along the line AA of FIG. 4, showing a state of each segment of the upper clamp member and the lower clamp member in a gripping state in the clamp device according to the embodiment of the present invention.
FIG. 8 is a front view showing the upper clamp member and the lower clamp member in the retracted state in the clamp device according to the embodiment of the present invention.
FIG. 9 is a plan view showing an operation of spinning the one end of the work including the operation of the chuck device in the spinning apparatus according to the embodiment of the present invention.
FIG. 10 is a plan view showing the spinning operation on one end of the work, including the operation of the chuck device, in the spinning apparatus according to one embodiment of the present invention.
FIG. 11 is a plan view showing the spinning operation on one end of the work including the operation of the chuck device in the spinning apparatus according to one embodiment of the present invention.
FIG. 12 is a plan view showing the spinning operation on the other end of the work, including the operation of the chuck device, in the spinning apparatus according to one embodiment of the present invention.
FIG. 13 is a front view showing a state in which a workpiece is gripped by a clamp device provided in another embodiment of the present invention.
[Explanation of symbols]
BS base, RL roller, CT controller,
1 spinning device, 2 clamp device, 3 chuck device,
4 work, 5 horizontal drive, 6 rotation drive, 7 frame,
9 cylinder, 10 upper clamp member, 20 lower clamp member,
11 upper support, 21 lower support, 100 clamping device

Claims (7)

Clamping means for gripping a metal tubular workpiece to be processed, processing means for performing spinning processing on the end of the work gripped by the clamping means, and displacing the clamp means relative to the processing means. Drive control means for performing spinning processing on the end of the work by the processing means, and a necking portion having at least one of eccentricity, inclination, and twist with respect to the body of the work, In a spinning apparatus formed at an end portion, the clamping means includes three or more segments that approach and separate from and separate from an axis of the work and grip a body portion of the work at the time of approach. A spinning apparatus, wherein the surface on the side of the shaft center is formed into a curved surface conforming to the outer peripheral surface of the body of the work. 2. The spinning apparatus according to claim 1, wherein the clamping means is disposed so as to be movable on a plane parallel to the axis of the work and rotatable about an axis perpendicular to the axis of the work. . The clamp means is at least two supports that grip and hold the body of the work when they are close to and separated from each other, and are fixed to one of the two supports, and move in the radial direction together with the supports to move the work in the radial direction. At least one fixed segment that is close to and separated from the axis of the work, movably supports each of the two supports, and moves in a radial direction with the two supports to form an axis on the work. And a plurality of movable segments that move in the axial direction of the work in conjunction with movement of the fixed segment in the axial direction of the work at least. The spinning apparatus according to claim 1, wherein a surface of the work on the side of the axis is formed into a curved surface that conforms to an outer peripheral surface of a body portion of the work. The two support members are composed of two members that are divided in a direction perpendicular to the surface including the axis of the work as a center, and the two members are disposed so as to approach and separate from each other. The spinning apparatus according to claim 3, wherein: 5. The spinning apparatus according to claim 4, further comprising a single driving unit that relatively drives the two members, the driving unit driving the two members so as to approach and separate from each other. The spinning apparatus according to claim 5, wherein a relative driving direction of the two members and a rotation axis of the support are parallel to each other. Equipped with an urging means for urging the plurality of movable segments to return to a predetermined retracted position, when moving the plurality of movable segments in the axial direction of the work against the urging means, The spinning apparatus according to claim 3, wherein the at least one fixed segment and the plurality of movable segments form an inner cylindrical surface having a substantially circular cross section.

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