JP2000263161A - Spinning apparatus and spinning method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To continuously and accurately and reliably perform a spinning process on a desired portion of a work with a simple configuration without changing a gripping position by a chuck even with a particularly long work. A spinning apparatus and method are provided. A spinning apparatus includes a chuck for gripping one end of a work, a forming roller arranged to be movable in an axial direction and a radial direction of the work, and a forming roller for the work. The rotation of the work W is performed by a rotation drive unit that rotates and rotates relatively to revolve, and a work guide unit 3 that supports the other end of the work W whose diameter can be changed according to a change in the diameter of the work W. A plurality of work guide members 30 abutting on the inner circumference;
And a radial moving mechanism 32 for radially moving each work guide member 30 in accordance with a change in the diameter of the work W.
And

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a spinning apparatus and a spinning method, and more particularly, to a spinning apparatus and a spinning method.
The present invention relates to a spinning apparatus and a spinning method for forming a workpiece into a predetermined shape by rotating a forming roller so as to abut on the workpiece and relatively revolve.

[0002]

2. Description of the Related Art Conventionally, spinning has been performed in which a work is plastically deformed into a predetermined shape by changing the revolving diameter of the forming roller while rotating the forming roller relatively to revolve with respect to the work. ing. An example of a work on which such spinning is performed is a container of a catalytic converter for treating exhaust gas discharged from an internal combustion engine such as an automobile engine. As shown in FIG. 6, a container of a general catalytic converter has a relatively large-diameter main body portion W1 for accommodating a catalyst carrier, a relatively small-diameter connection portion W3 connected to an exhaust pipe, and a main body portion. It is constituted by a tapered cone portion W2 whose diameter gradually decreases from W1 to the connection portion W3.

[0003] The container of such a catalytic converter is generally formed by spinning a cylindrical body accommodating a catalyst carrier and a cylindrical work having a diameter substantially the same as that of the main body separately from the main body. And a cone having a connecting portion. Then, in manufacturing the catalytic converter, cones are respectively joined to both ends of the main body in which the catalyst carrier is accommodated.

Further, for the purpose of reducing the number of manufacturing steps of the catalytic converter and improving the durability, etc.
As disclosed in JP-A-155202, JP-A-9-234377, or JP-A-61-110823, a catalyst carrier is accommodated in a cylindrical work longer than the catalyst carrier. It is known that the main body portion W1, the cone portion W2, and the connection portion W3 are integrally formed by pressing or drawing (spinning) both end portions of the substrate (hereinafter, referred to as integral molding).

Further, Japanese Patent Application Laid-Open No. 10-280953 discloses that one end of an outer tube provided with a space provided on the outer periphery of the inner tube is reduced in diameter and fixed to the inner tube, and the other end of the outer tube is reduced in diameter. As a method of manufacturing a muffler in which a buffer member is sandwiched between the inner tube and the inner tube, the outer tube is reduced in diameter while a core is inserted into one end of the outer tube to regulate the amount of reduced diameter of the outer tube. It is disclosed that a core having substantially the same diameter as the inner tube is inserted into one end of the tube. In this case, the diameter of the outer tube is reduced, and the diameter of the inner tube in which the core is inserted is not reduced.

Some of the above-mentioned catalytic converters are disclosed in, for example, JP-A-6-272548 and JP-A-10-180121 for the purpose of improving purification of exhaust gas discharged from an internal combustion engine. As described above, a so-called tandem-type catalytic converter in which a plurality of catalyst carriers are arranged in series in a container of the catalytic converter has been manufactured. FIG. 6 shows a tandem-type catalytic converter in which two catalyst carriers S1 and S2 are accommodated in a container formed by spinning. As a container of the catalytic converter to be spin-processed, a plurality of catalyst carriers S1 and S2 are housed in a main body portion W1 while being separated from each other and having a space T therebetween, and a cone portion W2 and a connecting portion W2 are connected.
A relatively long cylindrical work W is used so as to be able to form the third work piece 3.

When a tandem-type catalytic converter is integrally formed by spinning, as shown in FIG. 7A, a plurality of catalyst carriers S each having a mat M wound thereon are used.
1 and S2, the work W
Press into. Then, as shown in FIG. 7B, a position matching the one catalyst carrier S1 on the outside of the workpiece W is gripped by the chuck 51, and the catalyst carriers S1 and S2 are moved without moving in the container. In order to maintain the space T between the carrier S1 and the other catalyst carrier S2 adjacent to the carrier S1, the molding roller 52 (see FIG. 52 to work W
While being relatively revolved with respect to, it is pressed in the radial direction and moved in the axial direction to spin the space between the two catalyst carriers S1 and S2 to reduce the diameter, thereby forming the intermediate throttle portion W4. Thereafter, as shown in FIG. 7 (c), the chuck 51 holds a position near the end of the work W forming the cone portion W2, which is aligned with the other catalyst carrier S2, and the forming roller 52 is held against the work W. While rotating relatively, the workpiece W is pressed in the radial direction and moved in the axial direction to perform spinning, and the end of the work W is reduced in diameter to form the cone portion W2 and the connection portion W3. Next, as shown in FIG. 7D, a position close to one end of the catalyst carrier S1 near the opposite end of the work W is gripped by the chuck 51, and the work W
Is formed with a cone portion W2 and a connection portion W3 at the opposite end.

[0008]

However, when spinning a long workpiece W, such as when a tandem-type catalytic converter container is integrally formed from a cylindrical workpiece W, a forming roller 52 is used. When a position of the work W remote from the chuck 51 is pressed in the radial direction, FIG.
As shown in (1), the work W elastically bends, cannot be spinned to a set diameter, and a problem arises in that the molding accuracy is reduced. In order to suppress the elastic deformation of the work W, the position of the work W pressing the forming roller 52 from the chuck 51 is limited. Therefore, particularly, the container of the tandem-type catalytic converter in which the work W is elongated. In the case where is integrally molded, FIG.
As shown in (d), the workpiece W to be subjected to the spinning process
It is also necessary to change the position to be gripped by the chuck 51 in accordance with the part, and there is a problem that the number of steps is increased and the productivity cannot be improved.

Further, as shown in FIG. 9, even when the diameter of the work W is reduced by a plurality of forming rollers 52, each forming roller 52 is placed on the surface of the work W relatively to the work W. By revolving, a tangential force F1 is applied, and a force F2 by pressing the forming roller 52 against the workpiece W in the radial direction is applied. Then, the work W receiving the resultant force F3 of these forces F1 and F2
As shown by a two-dot chain line in FIG. 9, an ellipse or an ellipse long in a direction waving or in a direction substantially parallel to the resultant force F3 so that the surface of the work W elastically buckles forward in the revolution direction of the forming roller 52. It will be elastically deformed so that

[0010] When the workpiece W is elastically bent or deformed such as a wave during spinning, the deformation and return are repeated, and the forming roller 52 collides with the workpiece W. As shown in FIG. In addition, there is a problem that the spinning process cannot be continued because wrinkles are generated or deformed in the connection portion W3 or the like on which the spinning process is performed, and the work W becomes defective and cannot be adopted as a product. .

The present invention has been made in view of the above problems, and has a simple structure. In particular, even for a long work, continuous spinning processing of a desired portion of the work can be performed without changing a gripping position by a chuck. It is an object of the present invention to provide a spinning apparatus capable of performing the spinning processing accurately and reliably. Further, the present invention has been made in view of the above-described problems, and has a simple configuration, and particularly in a case of a long work, a desired portion of the work can be continuously and accurately performed without changing a gripping position by a chuck. It is another object of the present invention to provide a spinning method capable of reliably performing spinning.

[0012]

According to a first aspect of the present invention, there is provided a spinning apparatus, comprising: a chuck for gripping one end of a work; and a chuck movably in the axial and radial directions of the work. The forming roller, the rotation driving means for rotating the forming roller to revolve relatively to the work, and the other end of the work capable of changing the diameter according to the change in the diameter of the work. And a supporting work guide means.

According to a second aspect of the present invention, in order to solve the above-mentioned problems, one end of a work is gripped by a chuck, and the other end of the work is changed in diameter according to a change in the diameter of the work. It is supported by work guide means provided so that it can be changed, and while rotating so that the forming roller revolves relatively to the work, the forming roller comes into contact with the work and its axial direction and radial direction. The spinning process is performed by moving.

According to the first aspect of the present invention, the end of the work is supported by the chuck and the work guide means, and the forming roller is rotated by the rotary driving means such that the forming roller revolves relatively to the work. Is moved in the axial direction and the radial direction of the work to spin the work. Then, when spinning the end of the work supported by the work guide means, the diameter of the work guide means is changed according to the change of the diameter of the work. Since both ends of the work are supported, even when spinning a long work, deformation of the work such as elastic bending is prevented even when the work is pressed by the forming roller. Spinning of the intermediate part of the work and the other end supported by the work guide means can be performed continuously.

According to the second aspect of the present invention, the end of the work is supported by the chuck and the work guide means, and the forming roller is rotated so as to revolve relative to the work while the forming roller is rotated. The spinning process is performed by abutting and moving in the axial direction and the radial direction. At this time, when spinning the end of the work supported by the work guide means, the work guide means changes the diameter of the work according to the change of the diameter of the work. By supporting both ends of the work, even when spinning a long work, deformation such as elastic bending of the work is prevented even when pressed by the forming roller. Spinning of the intermediate part of the work and the other end supported by the work guide means can be performed continuously.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, an embodiment of a spinning apparatus according to the present invention will be described in detail with reference to FIGS. In this embodiment, the work to be subjected to the spinning process is a circular tube for integrally molding a container when a tandem-type catalytic converter is manufactured, and a cone portion continuous from the main body W1 of the container. A description will be given of a case in which spindle processing is performed to reduce the diameter of the work W in order to form the W2, the connection portion W3, and the intermediate throttle portion W4 that does not move the catalyst carriers S1 and S2 in the main body portion W1.
In the drawings, the same reference numerals denote the same or corresponding parts.

The spinning apparatus of the present invention generally comprises a chuck 1 for gripping one end of a work W, and a forming roller 2 movably arranged in the axial and radial directions of the work W.
A rotation driving unit (described later) that rotationally drives the forming roller 2 to revolve relatively to the work W; and a work W whose diameter can be changed according to a change in the diameter of the work W. Work guide means 3 for supporting the other end.

The work W is made of a material suitable for the container of the catalytic converter, and is a circular tube formed to have a diameter substantially the same as the main body portion P1 of the container of the catalytic converter to be molded. The work W is formed to have a length suitable for forming a container of the tandem catalytic converter. As the work W, any work W of a welded pipe and a seamless pipe can be used as long as it can form a catalytic converter container by spinning.

In this embodiment, the chuck 1 is composed of a pair of halves 10A and 10B formed in accordance with the outer shape of the work W, and a driving means such as a fluid pressure cylinder (not shown). ), The outer peripheral surface of the work W is sandwiched between the two members 10A and 10B.

As shown in FIG. 2, in this embodiment, a pair of forming rollers 2 are provided so as to be opposed to each other with the center axis C of the work W interposed therebetween. . Each support shaft 20 is provided movably in synchronization with the workpiece W in the axial direction J and the radial K direction. In this embodiment, the support shaft 20 moves around the central axis C of the work W such that the forming roller 2 revolves around the work W in the direction indicated by the arrow R in FIG. It is connected to a rotation drive means (not shown) such as a motor so as to rotate. The present invention is not limited to the configuration in which the forming roller 2 revolves around the work W. The chuck 1 and the work guide means 3 are rotated to rotate the work W May be configured to be driven to rotate about its central axis C. In the embodiment shown in FIGS. 3 and 4, the forming roller 2 is provided singly, but three or more forming rollers may be provided.

As shown in FIGS. 1 to 5, the work guide means 3 synchronizes a plurality of work guide members 30 abutting on the inner periphery of the work W with each work guide member 30 in the radial direction of the work W. And a radial moving mechanism 32 that radially moves each work guide member 30 in accordance with a change in the diameter of the work W.

The work guide members 30 are mutually connected to the work W
When moved in the radial direction so as to approach the central axis C of
The outer shape is divided so as to form a continuous arc, and the cross section is formed in a substantially fan-like shape.
Is set to be smaller than the diameter of the connecting portion W3 formed by reducing the diameter of the connecting portion W3. The number of the work guides 30 divided so that the outer shape forms a continuous circular arc differs depending on the size of the diameter of the work W before forming, the size of the connecting portion W3 to be formed, and the like. ~
It can be molded so as to be divided into about 12 pieces.

As shown in FIGS. 3 to 5, the support mechanism 31 has grooves 3 formed at one end of each work guide member 30.
10 and each work guide member 30 engaged with each groove 310.
And an engagement member 311 for guiding the movement in the radial direction. Groove 310 and engaging member 311
As shown in FIG. 5, is formed in a T-shape in this embodiment. However, the present invention is not limited to this. For example, as long as the work guide member 30 can be supported and guided so as to be movable in the radial direction, the work guide member 30 may have a so-called “recessed groove” shape such as a trapezoid. It can also be formed. The engagement member 311 is provided on a support member 312 radially extending from the center axis C of the work W in the radial direction, and the center of the support member 312 extends on the center axis C of the work W. Support rod 313 arranged
Thus, the work guide member 30 is supported so as not to move in the direction of the center axis C of the work W. The work guide member 30 is provided with measures to prevent the groove 310 from coming off the engagement member 311 and coming off.

The radial moving mechanism 32 has an inclined surface 321 formed on a surface radially inward of each work guide member 30.
And a tapered member 322 abutting on each inclined surface 321. The taper member 322 is disposed coaxially with the support rod 313 and is connected to a drive rod 323 of a drive unit (not shown) such as a fluid pressure cylinder, and is driven by the drive unit in the direction of the center axis C of the work W. Moved to The inclined surface 321 in the embodiment shown in FIGS. 3 and 4 moves when the respective work guide members 30 are moved in the radial direction so as to be closer to the center axis C of the work W (the state shown in FIG. 4). The size of the arc formed by the aggregation of the inclined surfaces 321 of the work guide members 30 is such that the diameter of the chuck 1 (left side in the figure) is small and the diameter of the opposite side (right side in the figure) is large. Accordingly, the inclination of the tapered member 322 is formed accordingly. Therefore, in this embodiment, by moving the taper member 322 forward to the chuck 1 side, the diameter of each work guide member 30 is changed so as to increase, and the taper member 30 is moved backward to the opposite side to the chuck 1. By doing so, the diameter of each work guide member 30 changes so as to decrease. The axial position of the drive rod 323 is controlled in conjunction with the movement of the forming roller 2 in the radial direction K. The radial movement mechanism 32 is not limited to this embodiment, and may be any other method as long as it can move each work guide member 30 in the radial direction according to a change in the diameter of the work W. Can be used.

Next, an embodiment of the spinning method of the present invention will be described in detail by using a spinning apparatus configured as described above. In the spinning method of the present invention, one end of the work W is roughly held by the chuck 1 and the other end of the work W is
While being supported by work guide means 3 provided so as to be able to change the diameter in accordance with the change in the diameter of the work, while rotating so that the forming roller 2 revolves relatively to the work,
The spinning process is performed by bringing the forming roller 2 into contact with the workpiece W and moving it in the axial direction J and the radial direction K thereof. Then, spinning of the intermediate portion of the work W and the other end supported by the work guide means 3 is performed continuously.

In manufacturing a tandem-type catalytic converter by spinning a work W, first, catalyst carriers S1 and S2 each having a mat M made of non-expandable fiber or the like wound on the outer periphery thereof are placed in a space therebetween. Press-fit into the work W in a state where they are separated from each other so that T is formed (FIG. 7).
(A)). Next, as shown in FIG. 1, the other end of the work W is externally fitted to and supported by the work guide member 30, and the chuck 1 including a pair of half-shaped members 10A and 10B is moved close to each other to move the work. Hold the outer peripheral surface of W. At this time, the taper member 322 is
The work W is controlled so as to be moved forward to increase the diameter of the work guide member 30, and the inner peripheral surface of the other end of the work W is in contact with and supported by the outer peripheral surface of each work guide member 30.

Thereafter, the forming roller 2 is rotationally driven to revolve with respect to the work W, and the forming roller 2 is moved in the axial direction J and the radial direction K of the work W as shown by an arrow P1 in FIG. An intermediate throttle having a reduced diameter at an intermediate portion of the work W so as to prevent movement of the catalyst carriers S1 and S2 accommodated in the work W and maintain a space T formed between the catalyst carriers S1 and S2. A part W4 is formed. At this time,
Since one end of the work W is supported by the chuck 1 and the other end is supported by the work guide member 30, the work W is elastically bent and deformed when the intermediate portion of the work W is reduced in diameter. There is no. Therefore, the work W
The dimensional accuracy and the like for reducing the diameter are improved.

Subsequently, the forming roller 2 is moved to the other end of the workpiece W in a manner continuous with the spinning process for reducing the diameter of the intermediate portion of the workpiece W, and the axial direction J of the workpiece W as indicated by an arrow P2 in FIG. The workpiece W is repeatedly moved in the radial direction K to reduce the diameter of the other end of the work W to form a tapered cone portion W2 and a small-diameter connection portion W3. At this time, the forming roller 2
Is controlled so that the tapered member 322 of the radial moving mechanism 32 moves backward in conjunction with the diameter of the smallest portion (connection portion W3) of the work W whose diameter has been reduced by the feed movement in the radial direction K. Work guide member 30 supporting the other end of the work
Is changed. Not only the one end of the work W is gripped by the chuck 1 but also the other end whose diameter is reduced is supported by the work guide member 30 whose diameter changes in accordance with the change in the diameter, so that the work W is elastically bent. Since there is no deformation, even in the case of a long work W used for a container of a tandem-type catalytic converter, the spindle processing of the intermediate portion and the other end can be continuously performed. Therefore, as shown in FIG. 7, the labor and time required to change the position to be gripped by the chuck 1 according to the processing part where the spindle processing of the work W is performed are reduced. In addition, when the work W is pressed by the forming roller 1 so as to reduce the diameter, the inside of the portion of the work W to be spun is formed by the work guide member 3.
0, the workpiece W can be easily controlled to a predetermined thickness, the molding failure can be reduced, the molding accuracy is improved, and the spinned portions (W2, W3, W4) are improved. ) Is also improved. Along with this, the processing speed such as the revolving speed and the feed speed of the forming roller 2 can be set to be high, so that the processing cycle time for one work W can be shortened. The cost for manufacturing the product can also be reduced.

Although the embodiment of the present invention has been described with reference to the case where the diameter of the work W is reduced in order to manufacture a tandem type catalytic converter, the present invention is not limited to this embodiment and has other objects. The workpiece W used in the above can be subjected to spinning. Further, the spinning processing performed in the present invention is not limited to the diameter reduction, and can be applied to the processing for expanding the diameter of the work W. In this case, although not shown, the work guide member 30 is configured to support the outer periphery of the work W.

[0030]

According to the first aspect of the present invention, a chuck for gripping one end of a work, a forming roller movably arranged in the axial direction and the radial direction of the work, and the forming roller is positioned relative to the work. A simple structure including a rotation driving means for rotationally driving so as to revolve in a regular manner, and a work guide means for supporting the other end of the work capable of changing the diameter in accordance with a change in the diameter of the work. In addition, it is possible to provide a spinning apparatus capable of continuously and accurately performing a spinning process on a desired portion of a work without changing the gripping position of the chuck even for a long work.

According to the second aspect of the present invention, one end of the work is gripped by the chuck, and the other end of the work is provided so that the diameter can be changed according to the change in the diameter of the work. A simple process of spinning by supporting the work roller and rotating the forming roller so that it revolves relatively to the work, and moving the forming roller in the axial and radial directions while contacting the work. According to the configuration, it is possible to provide a spinning method capable of continuously and accurately spinning a desired portion of a work without changing the gripping position of a chuck even for a long work. it can.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a spinning apparatus according to the present invention, in a state where an end of a work is supported by a chuck and work guide means.

FIG. 2 is a perspective view showing a state in which a workpiece is reduced in diameter by a forming roller from the state of FIG. 1;

FIG. 3 is a partial cross-sectional view showing a state before the diameter of the work supported by the work guide means is reduced by a forming roller.

FIG. 4 is a partial cross-sectional view showing a state where the diameter of the work guide means changes as the diameter of the work is reduced by the forming roller from the state of FIG. 3;

FIG. 5 is an explanatory diagram illustrating a work guide member and a support mechanism that supports the work guide member so as to be movable in a radial direction.

FIG. 6 is a perspective view showing a tandem catalytic converter manufactured by applying the present invention.

FIG. 7 is an explanatory view showing a conventional process for manufacturing a tandem-type catalytic converter.

FIG. 8 is an explanatory view showing a state in which the forming roller is elastically bent by pressing a forming roller against a long work.

FIG. 9 is an explanatory diagram illustrating a force applied to a workpiece that is subjected to spinning by a forming roller and a state where the workpiece is deformed by the force.

FIG. 10 is a perspective view showing a state of a portion where a molding is defective due to wrinkling of a work.

[Description of sign]

 Reference Signs List 1 chuck 2 forming roller 3 work guide means 30 work guide member 31 support mechanism 32 radial movement mechanism W work W1 main body W2 cone W3 connection W4 intermediate throttle C central axis S1, S2 catalyst carrier K radial J axial

Claims (2)

[Claims] A chuck for gripping one end of a work;
A forming roller arranged movably in the axial direction and the radial direction of the work, a rotation driving means for rotating the forming roller to revolve relative to the work, and a diameter in accordance with a change in the diameter of the work. And a work guide means for supporting the other end of the work that can be changed. 2. A forming roller, wherein one end of a work is gripped by a chuck and the other end of the work is supported by work guide means provided so as to be able to change the diameter according to the change in the diameter of the work. A spinning method, wherein a spinning process is performed by rotating a forming roller in contact with a workpiece and moving the forming roller in the axial direction and the radial direction while rotating the roller so as to revolve relatively to the workpiece.