WO2000016924A1

WO2000016924A1 - Production method for double-structure container

Info

Publication number: WO2000016924A1
Application number: PCT/JP1999/005184
Authority: WO
Inventors: Tohru Irie; Masashi Ota
Original assignee: Sango Co., Ltd.
Priority date: 1998-09-24
Filing date: 1999-09-22
Publication date: 2000-03-30
Also published as: JP2000094050A; EP1025923A1; JP2957176B1

Abstract

A production method for a double-structure container having a clearance between an inner tube and an outer tube thereof, wherein, in order to facilitate production thereof and reduce production costs, an inner tube (4A) is disposed inside an outer tube (4B) with a clearance (4C) therebetween, solid inclusion (4D) is held in at least one tube-axis-direction segment in the clearance (4C), and the outer tube (4B) is subjected to spinning in that condition to concurrently change the sections of the inner and outer tubes (4A, 4B).

Description

Description Manufacturing method of double-structured container Technical field

The present invention relates to a method for manufacturing a double-structured container, and more particularly, to a method for manufacturing a double-structured container by simultaneously changing the cross-sectional shapes of an inner cylinder and an outer cylinder.

Background art

For exhaust system components of automobiles, such as mufflers and catalytic converters, an integrated inner cylinder whose cross-sectional shape changes continuously in the axial direction, and an integrated outer cylinder whose both ends are tapered in shape Insulated pipe structures that are arranged concentrically while maintaining a gap between them are often used. In particular, in a catalytic converter, as shown in FIG. 15, a metal inner cylinder 104 having a catalyst simple substance 101 fitted therein and having tapered diameter reduced portions 102, 103 at both ends is provided. By combining a metal outer cylinder 107 having tapered diameter portions 105, 106 at both ends, a gap 108 is formed between the inner cylinder 104 and the outer cylinder 107. Provision is often made. This configuration is disclosed in, for example, Japanese Patent Application Laid-Open No. 6-110465.

As a method of manufacturing the catalytic converter shown in FIG. 15, the outer cylinder 107, which is provided with a predetermined gap 108 outside the inner cylinder 104, which has been previously reduced in diameter, is reduced in diameter. There is something to do. However, the method is difficult and costly to manufacture.

Particularly problematic is the molding of the outer cylinder 107. That is, in the formation of the outer cylinder 107 having a cross-sectional shape which somewhat follows the cross-sectional change in the axial direction of the inner cylinder 104 and maintains the desired air gap 108, the desired air gap 100 is formed over the entire length in the axial direction. Forming the integral outer cylinder 107 so as to form 8 was extremely difficult.

Therefore, as a convenient manufacturing method, a technology is adopted in which an outer cylinder formed in half in the axial direction is secured with a gap outside the preformed inner cylinder, and both halves are joined by welding or the like. Is common. However, this method requires costly equipment such as press dies and welding equipment, and also requires a lot of labor and time in the pressing and welding processes. Therefore, instead of the above-described manufacturing method, as shown in FIG. A large-diameter portion 202 is formed at the base of 1 and a reduced-diameter portion 204 is formed at the base of the outer cylinder 203. These two cylinders 201 and 203 are formed as shown in FIG. A technique has been proposed in which a double-walled catalytic converter having a predetermined gap 205 is inserted into the catalytic converter. This is disclosed, for example, in Japanese Patent Application Laid-Open No. Hei 9-1108567.

However, in the manufacturing method shown in FIG. 16, the contact between the enlarged diameter portion 202 of the inner cylinder 201 and the outer cylinder 203 and the reduced diameter portion 204 of the outer cylinder 203 are formed. Since contact with the inner cylinder 201 is inevitable, and heat transfer occurs from the contact portion, there is a problem that the heat insulating effect is reduced even if the air gap portion 205 is provided and the heat insulating structure is used.

Further, as a method for manufacturing a thermos, there is a method in which an inner cylinder having only one side opening and an outer cylinder having only one end opening are separately formed in an arbitrary cross section by a spying process, and these are polymerized. This is disclosed, for example, in Japanese Patent Application Laid-Open No. 10-15631 and Japanese Patent Application Laid-Open No. 7-284454.

However, in this manufacturing method, it is necessary to separately spun the inner cylinder and the outer cylinder, which complicates the process and requires a separate step of reducing the diameter of the outer cylinder after the insertion of the inner cylinder. The simplification and reduction of processing costs cannot be achieved by this method.

From the above, it is possible to easily and inexpensively manufacture a double-structured container having a predetermined gap between the inner cylinder and the outer cylinder, and in which the inner cylinder and the outer cylinder are integrally and axially deformed in cross section. There was a demand for a way to cut it.

Disclosure of the invention

An object of the present invention is to provide a method for manufacturing a double-structured container that meets the above demand.

Therefore, in the first aspect of the production method of the present invention, the inner cylinder is disposed inside the outer cylinder while maintaining a gap, and solid inclusions are sandwiched in at least one section of the gap in the cylinder axis direction. It is characterized in that the outer cylinder is subjected to spying processing to change the cross-sections of the inner cylinder and the outer cylinder at the same time.

Therefore, in the manufacturing method of the first aspect, the inner and outer cylinders holding the solid inclusions are rotated around the axis of the cylinder, and the spinning roller is pressed against the outer cylinder to carry out spinning calorie, whereby the pressing force is increased. The cross section of the outer cylinder changes due to The pressing force is transmitted to the inner cylinder via the deformable solid inclusion sandwiched in the gap, and the cross section of the inner cylinder changes simultaneously. Thus, each end of the inner and outer cylinders can be simultaneously formed into a desired cross-sectional shape in one spinning process.

Conversely, it is also possible to perform the spying process by pressing the spun roller against the outer tube by stopping the inner and outer cylinders and revolving the spun roller.

At this time, as in the case of rotating the inner and outer cylinders described above, the revolving spinning roller is pressed against the stationary outer cylinder to perform the spinning process, whereby the cross section of the outer cylinder changes due to the pressing force. Further, the pressing force is transmitted from the outer cylinder to the inner cylinder via a deformable solid inclusion sandwiched in the gap, so that the cross section of the inner cylinder can be simultaneously changed.

Therefore, in the same manner as described above, each end of the inner and outer cylinders can be simultaneously formed into a desired cross-sectional shape in a single spying process.

In a second aspect of the production method of the present invention, the inner cylinder is disposed inside the outer cylinder while maintaining a gap, and at least one section of the gap in the cylinder axis direction is sandwiched by solid inclusions. The outer cylinder is revolved and spinning is applied to the outer cylinder, and the cross section of the inner cylinder and the outer cylinder is simultaneously changed eccentrically to the cylinder axis of the material of the inner and outer cylinders. It is.

In the manufacturing method of the second surface, the respective ends of the inner and outer cylinders which are eccentrically changed with respect to the cylinder axis of the material are formed by the same operation as the manufacturing method of revolving the spinning roller of the first surface. Can be formed simultaneously by one spinning process.

According to a third aspect of the production method of the present invention, the inner cylinder is disposed inside the outer cylinder while maintaining a gap, and solid inclusions are sandwiched in at least one section of the gap in the cylinder axis direction. The cylinder axis of the material is tilted with respect to the axis of the spinning roller, and the spinning port is revolved to spin the outer cylinder.The cross section of the inner cylinder and the outer cylinder is changed to the cylinder axis of the inner and outer cylinder material. On the other hand, it is characterized in that the bending is simultaneously changed.

In the manufacturing method of the third surface, each end of the inner and outer cylinders bent and changed with respect to the cylinder axis of the material by one operation by the same operation as the manufacturing method of revolving the spinning roller of the first surface. It can be formed simultaneously by the spinning process. Further, in the manufacturing method of the present invention, a cored bar may be inserted into at least one section of at least one of the inner cylinder and the outer cylinder before the spying process.

For this reason, at the time of spinning, excessive deformation of the inner cylinder and the outer cylinder can be prevented by inserting a metal core between the inner cylinder and the outer cylinder or into the inner cylinder.

Further, in the production method of the present invention, the solid inclusion may be a solidified state of a heat-meltable resin, a thermoplastic resin, or a molten salt.

By heating and softening and melting the solid inclusions, it is easy to fill the solid inclusions into the gap before forming the inner and outer cylinders and to remove the solid inclusions from the gap after the forming process. I can do it.

BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a longitudinal sectional view showing an example of a spinning machine used in the manufacturing method of the present invention. FIG. 2 is a partially cutaway plan view of the spying machine in FIG.

FIGS. 3A and 3B are schematic perspective views of a clamp portion and a roll portion of the material of the spinning machine in FIG.

4A to 4D are process diagrams showing a first embodiment of the manufacturing method according to the present invention. 5A to 5D are process diagrams showing a second embodiment of the manufacturing method according to the present invention. FIG. 6 is a longitudinal sectional view showing a third embodiment of the manufacturing method according to the present invention.

FIG. 7 is a cross-sectional view showing a fourth embodiment of the manufacturing method according to the present invention.

FIG. 8 is a longitudinal sectional view showing a fifth embodiment of the manufacturing method according to the present invention.

9A to 9C are process diagrams in the fifth embodiment of FIG.

FIG. 10 is a longitudinal sectional view showing a sixth embodiment of the manufacturing method according to the present invention.

FIG. 11 is a process chart of the sixth embodiment of FIG.

FIG. 12 is a perspective view of a material formed by the manufacturing method of the sixth embodiment shown in FIG.

FIG. 13 is a view showing the product of the embodiment shown in FIG. 10 obtained by performing the contraction process of FIG. 11 on both sides of the blank.

FIG. 14 is a process chart showing a seventh embodiment of the manufacturing method according to the present invention.

FIG. 15 is a longitudinal sectional view showing a first conventional manufacturing method.

FIG. 16 is a longitudinal sectional view showing a second conventional manufacturing method.

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described based on the embodiment shown in FIGS. First, a spinning machine for carrying out the manufacturing method of the present invention will be described with reference to FIGS.

Fig. 1 is a partially cutaway side view of the spinning machine, and Fig. 2 is a partially cutaway plan view of the spinning machine of Fig. 1. One side of the fixed base 1 has a material (ヮ 1 H) A drive unit 2 is provided, and a mouth drive unit 3 is provided on the other side. On the base 1 of the material drive unit 2 side, which will be described later roll 2 8 revolution axis X 5 parallel direction X-direction slide rails 5 Article ² parallel fixedly provided along (referred to as X direction) of Have been. An X-direction slider 6 is mounted on the X-direction slide rail 5 so as to be slidable in the X-direction, and a ball spline shaft 8 is screwed to a boss 7 provided on the X-direction slider 6. By rotating the ball spline shaft 8 forward and backward by a desired amount by a driving means 9 such as a motor, the X-direction slider 6 can be moved forward and backward by a desired amount in the X direction.

On the X-direction slider 6, two Y-direction slide rails 10 are fixedly arranged in parallel along a horizontal direction orthogonal to the X direction (this is referred to as a Y direction). On the Y-direction slide rail 10, a Y-direction slider 11 is slidably mounted in the Y-direction. Further, a bed 30 is mounted and fixed on the Y-direction slider 11, and a ball spline shaft 15 is screwed to a boss 14 fixed to the lower surface of the bed 30. Then, by rotating the ball spline shaft 15 forward and backward by a desired amount by a driving means 16 such as a motor, the bed 30 can be moved forward and backward by a desired amount in the Y direction.

The bed 30 is provided with a rotation drive means 31 such as a motor, and the rotation drive shaft 31 a of the rotation drive means 31 is vertically arranged on the bed 30. It is protruding. The rotary drive means 31 and the rotary drive shaft 31a constitute tilting means for the material 4.

A lower clamp 13 constituting a clamp device 12 is slidably mounted on the upper surface of the bed 30 and the drive shaft 31 a is fixed to the lower clamp 13. By the forward / reverse rotation of the drive shaft 31a, the lower clamp 13 rotates forward / backward in the horizontal plane about the rotation drive shaft 31a. An arc-shaped guide groove 32 centered on the rotary drive shaft 31 a is formed in the bed 30, and protrudes from the lower surface of the lower clamp 13 in the guide groove 32. Guide port 33 is rotatably fitted. As shown in FIG. 2, the rotation drive shaft 31a is set at a position where the axis of the rotation drive shaft 31a intersects the cylinder axis X4 of the material 4 placed on the lower clamp 13 described later at right angles. ing.

The upper surface of the lower clamp 13 has a semicircular clamp surface 13a for supporting the lower half surface of the material 4.When the material 4 is placed on the clamp surface, the cylindrical shaft X4 of the material 4 will be described later. It is formed so as to be at the same height position as the axis X5 of the rotary shaft 21 of the port drive unit 3. Further, an upper clamp 17 having a clamp surface 17a for pressing and holding the upper semicircle of the material 4 is formed on the lower surface of the lower clamp 13 so as to be able to move up and down. 17 is driven up and down by a driving means 18 such as a hydraulic cylinder, so that the upper clamp 17 and the lower clamp 13 do not rotate the material 4 to the set position due to the lowering of the upper clamp 17. The material 4 can be attached and detached by raising the upper clamp 17.

A stopper 19 is provided at a rear portion of the clamp device 12, and by positioning the rear end of the material 4 against the stopper 19, the material 4 can be easily positioned in the axial direction. The stopper 19 is provided, for example, in the lower clamp 13 so as to move in synchronization with the clamp device 12 and to adjust the position of the material 4 in the direction of the cylinder axis X4.

Next, the mouth drive unit 3 on the base 1 will be described.

A rotating equipment section 20 is installed on the base 1, and a rotating shaft 21 is provided on the section 20 so that the axis of the rotating shaft 21 can be turned in the X direction. The rotary shaft 21 is rotated in one direction via a belt 23 by a motor 22 which is a rotation driving means. A port holder 24 is fixed to the rotating shaft 21 on the side of the material driving section 2. The rotation of the rotating shaft 21 causes the port holder 24 to rotate about the axis X 5 of the rotating shaft 21. It is designed to rotate. The rotary equipment section 20 is provided with trajectory changing means for changing the driving trajectory of the knurl, the means includes a cylinder 25 as a driving means, and a rod 25 a of the cylinder 25. At the end of the roll holder 2 so that it does not hinder the rotation of the roll holder 2. 4 and a ring plate 26 provided inside. The ring plate 26 is formed in an annular shape coaxial with the rotary shaft 21, and an inner surface of a tip portion thereof is formed on a tapered surface 26 a which spreads outward.

A plurality of, in the embodiment shown, three brackets 27 are arranged at equal intervals in the circumferential direction of the roll holder 24 on the roll holder 24. Further, each bracket 27 is provided so as to be movable in a radial direction about the axis X5 of the roll holder 24. Further, a tapered surface 27 a is formed along the taper surface 26 a of the ring plate 26 on the side corresponding to the inner surface of the roll holder 24 of each bracket 27, and the outer end of each bracket 27 is formed. Is provided with a roll 28 which is free to rotate itself.

Although not shown, each bracket 27 is provided with a means for constantly urging the bracket 27 to the outer peripheral side of the roll holder 24, for example, a return spring, and a ring plate 26 made of a cylinder 25 is provided. Movement (left side in Fig. 1) Movement causes both tapered surfaces 26a and 27a to push each bracket 27 in the axial direction, and each roll 28 to move in the axial direction of the rotating shaft 21. By moving the same amount, and moving the ring plate 26 backward (to the right in Fig. 1), the brackets 27 are returned radially outward by both taper surfaces 26a and 27a. Each roll 28 is moved by the same amount radially outward of the roll holder.

Next, a method for manufacturing a double-structure container by simultaneously deforming the inner cylinder and the outer cylinder in cross section using the above-mentioned spinning machine will be described.

4A to 4D show a first embodiment of the manufacturing method according to the present invention.

FIG. 4A shows a first step, in which a metal outer cylinder 4B made of metal and having a diameter larger than that of the inner cylinder 4A is arranged concentrically outside a metal inner cylinder 4A, The figure shows a state in which solid inclusions 4D are filled in an annular space 4C having a predetermined width formed between the two cylinders 4A and 4B. The material in this state is referred to as material 4.

As the solid inclusions 4D, for example, a heat-meltable resin is used, and at the time of this filling, the inner and outer cylinders 4A and 4B are formed with a predetermined gap 4C therebetween. In this manner, one end of the gap 4C is closed by an appropriate means, and the resin in a heated and molten state is poured into the gap 4C from the other open end, and cooled and solidified. Then, a solid inclusion 4D is interposed between the inner and outer cylinders 4A and 4B.

The solid inclusion 4D has a good filling property and a good discharging property, and can be deformed to some extent when filled to a solid state, and has a small compressive force (even a non-compressible one). Is preferable, and the above-mentioned heat-fusible resin is preferable, but other resins may be used. It is desirable that the melting point of the heat-meltable resin is higher than the temperature of the raw material 4 raised by spinning. As the above-mentioned heat-fusible resin, for example, a resin commercially available under the trade name "Seal Peal Hot" can be used.

Next, as shown in FIG. 4B, the process shifts to a second step of clamping the material 4 with the clamping device 12 of the spinning machine and reducing the diameter of the end of the material 4.

Before diameter reduction, the ring plate 26 of the spinning machine is located to the right of the position shown in Fig. 1, and each roll 28 retracts outside the outer diameter of the material 4 before processing. Open.

Then, the material 4 is fitted and placed on the clamp surface 13 a of the lower clamp 13 while the rear end thereof abuts against the stopper 19 set at a predetermined position, and then the driving means 18 is mounted. When activated, the upper clamp 17 is moved downward, and the material 4 is clamped by the upper and lower clamps 13 and 17 so as not to rotate. The driving means 16 sets the position of the clamp device 12 in the Y direction at a position where the extension of the axis of the rotary drive shaft 31 a crosses the extension of the axis X 5 of the rotary shaft 21. .

If necessary, as shown in FIG. 4B, a core metal 51 is inserted into the inner cylinder 4A on the spinning side. The cored bar 51 has a reduced diameter portion 51a corresponding to the reduced diameter of the inner cylinder 4A, a tapered portion 51b extending from the reduced diameter portion and inclined outward in the radial direction, and a tapered portion. The large diameter portion 51 c is continuous and extends parallel to the axial direction, and the large diameter portion 51 c is formed to have an outer diameter substantially equal to the inner diameter of the material 4.

Next, the ball spline shaft 8 is rotated in one direction by the driving means 9 to move the clamping device 12 to the right side in FIG. 1 along the X direction parallel to the axis X 5 of the rotating shaft 21, and FIG. As shown in 4B, each roll 28 is positioned at the starting point A of diameter reduction of the material 4.

From this state, the motor 22 as a driving means is driven to move the roll holder 24 one side. And the drive means 25 is operated to advance the ring plate 26 to move the revolving locus of each roll 28 toward the center of the roll holder 24, and the driving means 9 is moved. The ball spline shaft 8 is driven to rotate in the opposite direction to the previous direction, and the clamp device 12 and the material 4 are retracted to the left in FIG.

As a result, each of the rolls 28 revolves around the cylinder axis X5 while rotating freely while being pressed against the outer peripheral surface of the outer cylinder 4B of the material 4, and the diameter of the revolving locus gradually decreases, thereby starting the diameter reduction. From A, it is spun as shown in Figure 4B.

Due to this spinning, the outer cylinder 4B is reduced in diameter and the deformation force is transmitted to the inner cylinder 4A via the solid inclusion 4D, and the inner and outer cylinders 4A, 4B and the solid inclusion 4D are formed. Deform at the same time.

That is, a taper portion 4b reduced in diameter from the elemental tube portion 4a of the inner and outer cylinders 4A and 4B and a neck portion 4 extending from the tip of the taper portion 4b are connected to the inner and outer cylinders 4A, It is formed in series with the solid inclusion 4D sandwiched between 4B.

The spinning process is performed in one pass or a plurality of passes of the roller as necessary.

In addition, when the core bar 51 is inserted during the spinning process, the neck portion 4c is accurately reduced in diameter by the reduced diameter portion 51a of the core bar 51. Further, as shown in FIG. 4B, the spinning roller 28 moves along the tapered portion 51 b of the core bar 51 as shown by the arrow in the figure, and moves from the large-diameter portion 51 c of the core bar 51. Separate outward.

Next, the inner and outer cylinders 4A and 4B are cut at the part C shown in Fig. 4B, and the throwaway part 4e is removed.

Next, as a third step, the raw material 4 formed in the second step is removed from the clamping device 12, inverted in the axial direction, clamped again by the clamping device 12, and processed in the second step. As shown in FIG. 4C, the other cylindrical end of the material 4 on the side opposite to the bent side is subjected to spinning to reduce the diameter in the same manner as in the second step. At this time, if necessary, the core metal 51 is used in the same manner as in the second step.

Next, the inner and outer cylinders 4A and 4B are cut at the part D shown in Fig. 4C, and the throwaway part 4f is removed.

The cutting of the inner and outer cylinders 4A and 4B in the second and third steps is performed after the third step. You can go with me.

Although the above-mentioned disposal portions 4 e and 4 f are not always necessary, in order to accurately form the shape of the cylinder end, the disposal portions 4 e and 4 f are provided and cut and removed. It is desirable.

As described above, both ends of the material 4 are reduced in diameter by the single spinning process.

Then, after the molding process, the molded product is removed from the clamp device 12, and the solid inclusion 4 D may be left as it is in the void 3 C as a final product as it is in the third step. As shown in FIG. 4D, as a fourth step, the solid inclusion 4D may be removed, and a void 4C formed between the inner and outer cylinders 4A and 4B may be used as a final product.

When the solid inclusions 4D are a heat-melted resin, by heating the product in the fourth step, the solid inclusions 4 can be melted and easily removed and removed.

When using a material with excellent heat insulation properties as the solid inclusion 4D, for example, a heat insulating mat, it is desirable to leave it as it is, but in general, it is highly heat-resistant when used as an exhaust system container for automobiles. Solid inclusions 4D are removed because of the required properties.

In the product of FIG. 4D formed as described above, both ends of the inner and outer cylinders 4A and 4B are connected to other connecting pipes and the like so that a gap 4C is maintained between them. Is done.

FIG. 5 shows a manufacturing method according to a second embodiment of the present invention.

The second embodiment is an embodiment in which the interior is accommodated in the inner cylinder 4A of the first embodiment, and shows an example in which the present invention is applied to a catalyst converter of an exhaust system of an automobile.

As the first step of FIG. 5A, the catalyst carrier 50 is inserted or press-fitted in the first step of the first embodiment shown in FIG. 4A.

Thereafter, through the same second step (FIG. 5B), third step (FIG. 5C), and fourth step (FIG. 5D) as in the first embodiment, as shown in FIG. A double pipe with 0 inside and a gap 4C between the inner and outer cylinders 4A and 4B is manufactured.

Note that, also in the present embodiment, the core metal 51 is not always necessary, and may be arbitrarily used as needed.

FIG. 6 shows a third embodiment of the manufacturing method according to the present invention. In the third embodiment, an interior such as the second embodiment, for example, a catalyst carrier 50 is housed, and one end of the inner and outer cylinders 4A and 4B is connected between the inner and outer cylinders 4A and 4B. This is an example of a case where a resonance type muffler is integrally provided at a rear portion of the catalytic converter 50 of the second embodiment, for example, in a case where the resonance type muffler is extended with a gap 4C. In FIG. 6, the range indicated by reference numeral 54 is the portion of the resonance type muffler.

The manufacturing process of the third embodiment is basically the same as the manufacturing process of the second embodiment.A resonance hole 52 is previously formed in the 1S inner cylinder 4 #, and the second process is performed during spinning. As the core metal 51 described in the example, a core metal whose extension is extended is used, and the resonance hole 52 is closed from the inside of the inner cylinder 4A by the extension.

One end of the inner and outer cylinders 4A and 4B molded according to the third embodiment, for example, the left end in FIG. 6 is fixed to another connecting pipe, while the other end, for example, the right end in FIG. A wire net ring 53 for holding the outer cylinder 4A and the outer cylinder 4B so as to be movable with each other is sandwiched, so that the inner cylinder 4A and the outer cylinder 4B can follow the mutual movement caused by the difference in thermal expansion between the outer cylinder 4A and the outer cylinder 4B. I have. In the embodiment shown in FIG. 6, the thickness (gap distance between the inner and outer cylinders) of the gap 4 C on the left side (A side) of the catalyst carrier 50 gradually changes. The diameter of the cylinder 4A and the outer cylinder 4B is reduced in advance to the taper part and the neck as shown in the figure, and the inner cylinder 4A is inserted into the outer cylinder 4B, and the diameter of the inner cylinder 4A is reduced. The solid portion 4D is filled in the gap 4C between the inner cylinder 4A and the outer cylinder 4B on the right side (B side) of the catalyst carrier 50, and the outer cylinder 4B Is subjected to spinning as described above.

In the product manufactured in the third embodiment, the exhaust gas is purified by the catalyst carrier 50, and the exhaust noise flows into the cavity 4C of the resonance type muffler part 54 through the resonance hole 52, and 4 C becomes a resonance space and is muted. In addition, the voids 4 C also exhibit the original heat insulating effect.

From the above, the inner and outer cylinders 4A and 4B having the void 4C can be formed as desired by arbitrarily setting the filling range of the solid inclusion 4D and the use range and shape of the core metal 51. Can be.

FIG. 7 shows a fourth embodiment of the manufacturing method according to the present invention.

The fourth embodiment shows an example of manufacturing a double pipe in which the axes of the inner cylinder 4A and the outer cylinder 4B are mutually eccentric. As a manufacturing method of this embodiment, in the first step of the first and second embodiments, the inner cylinder 4A and the outer cylinder 4B are mutually eccentrically desired, and solid inclusions are formed in the voids 4C. After filling with 4D, the same manufacturing process as described in the first and second embodiments is performed. FIG. 8 shows a fifth embodiment of the manufacturing method according to the present invention.

The fifth embodiment is an example in which one reduced diameter portion and the other reduced diameter portion of the double cylinder (container) are eccentric.

This manufacturing process will be described.

First, as shown in FIG. 5A, the material 4 has a solid inclusion 4D interposed between the inner cylinder 4A and the outer cylinder 4B, and has an inner material, for example, a catalyst carrier 50 in the inner cylinder 4A. Use something.

In FIG. 1, the ring plate 26 is located to the right of the position shown in FIG. 1, and each roll 28 is retracted to the outside from the outer diameter of the raw material 4 before processing, and is open before the contraction work.

Then, the unprocessed material 4 is fitted and placed on the clamp surface 13 a of the lower clamp 13 while the rear end of the raw material 4 is brought into contact with the stopper 19 set at a predetermined position, and then the driving means 18 is operated. Then, lower the upper clamp 17 and clamp the material 4 with the upper and lower clamps 13 and 17 so as not to rotate. In addition, the rotation drive means 31 is operated to rotate the clamp device 12 so that the cylindrical axis X 4 of the material 4 sandwiched between the clamp device 12 and the axis X 5 of the rotary shaft 21 is parallel. Further, the driving means 16 is actuated, and the clamping device 12 is moved by the predetermined amount OF 1 (see FIG. 9A) so that the cylinder axis X 4 of the material 4 is parallel to the axis X 5 of the rotating shaft 21. Move and adjust in the Y direction so that it is eccentric (offset). Next, the ball spline shaft 8 is rotated in one direction by the driving means 9 to move the clamping device 12 to the right side in FIG. 1 along the X direction, and the material 4 is rolled in parallel with the cylinder shaft. 2 Advance the specified amount to the 4 side (to the right in Fig. 1) and move each roll 28 to the starting point A (see Fig. 9A) for reducing the diameter of the material 4.

From the state shown in FIG. 9A, the motor 22 as the driving means is driven to rotate the roll holder 24 in one direction, and the driving means 25 is operated to move the ring plate 26 forward. While closing the revolving locus of the roll 28 toward the center of the roll holder 24, the driving means 9 is driven in the reverse direction to move the ball spline shaft 8 in the opposite direction to the above. To retract the clamping device 12 together with the material 4 to the left in FIG. 1 along the X direction.

As a result, each of the rolls 28 revolves around the cylinder axis X5 while rotating freely while being pressed against the outer peripheral surface of the outer cylinder 4B of the material 4, and the diameter of the revolving locus gradually decreases, thereby starting the diameter reduction. As shown in Fig. 9B, A is spunjungka. At this time, since the revolution axis X5 of the roll 28 is eccentric by OF1 from the cylinder axis X4 of the material 4, the spinned cylinder end becomes the material 4 as shown in FIG. 9B. The cylindrical part (body part) of 4a is plastically deformed into a frusto-conical taper part 4b centered on a revolution axis X5 eccentric by OF1 from the axis X4.

After the taper portion 4b is formed, the roll 4 is kept closed and the material 4 is continuously retracted, so that the tip of the taper portion 4b is attached to the cylindrical shaft X of the material 4. A cylindrical neck portion 4c parallel to 4 and having the axis of revolution X5 as an axis is formed by plastic deformation. Then, the material 4 and the roll 28 are moved backward by the movement reverse to the forward movement of the diameter reduction movement, and the first reciprocating movement ends the first spinning process.

After the above-mentioned first spinning process is completed, each port 28 is returned to the open position, and the driving means 9 is operated to rotate the ball spline shaft 8 in one direction to thereby provide a clamping device. The material 4 is further advanced along with the cylinder axis by a predetermined amount together with 1 2, and each portal 28 is positioned at the point B in FIG. 9C. Further, the drive means 16 is operated to rotate the ball spline shaft 15 in one direction, and the material 4 is further moved in the Y direction by a predetermined amount together with the clamping device 12 as shown in FIG. 9C. The eccentricity OF2 between the cylinder axis X4 of the material 4 and the rotation shaft 21 of the rotary shaft 21, that is, the revolving axis X5 of the roll 28 is set to be larger than the eccentricity OF1.

Then, in this state, the amount of closing movement of the roll 28 is set to be larger than that in the first step, and the same spinning is performed. As a result, the tapered portion 4b has a frusto-conical shape centered on an axis X5 that is eccentric by an OF2 amount from the cylindrical axis X4 of the raw material 4 (body portion) 4a. It is plastically deformed into a tapered portion 4b with a large corner. Also, after forming the tapered portion 4b, the roll 4 is held at the closed position and the material 4 is continuously retracted, so that the tip of the taper portion 4b becomes A small diameter neck 4c is formed. Through the steps described above, the reduced diameter portion 4d in which the eccentric taper portion 4b and the eccentric neck portion 4c are integrally formed at the end (the right portion in FIG. 8) is formed.

In the spinning process, the outer cylinder 4B is reduced in diameter and the deformation force is transmitted to the inner cylinder 4A via the solid inclusion 4D, and the inner and outer cylinders 4A and 4B and the solid inclusion 4D are deformed. Are simultaneously deformed.

That is, the taper portion 4b, which is reduced in diameter from the elemental tube portion 4a of the inner and outer cylinders 4A, 4B, and the neck portion 4c extending from the tip of the taper portion 4b, are formed by the inner and outer cylinders 4A, 4B It is formed in a series with solid inclusions 4D sandwiched between B.

Next, the material 4 formed in the above step is removed from the clamping device 12, inverted in the axial direction, and clamped again by the clamping device 12, and the material 4 on the side opposite to the side processed in the above step is removed. The other end of the cylinder is spinned in the same manner as described above to reduce the diameter. At this time, in FIG. 1, the cylindrical shaft X 4 of the raw material 4 and the axis X 5 of the rotary shaft 21 are positioned coaxially and spinning is performed, so that the element shown in the left side of FIG. A tapered portion 4b and a neck 4c concentric with the cylindrical portion 4a are formed.

Then, after the molding, the molded product is removed from the clamp device 12 and the solid inclusion 4D may be left as it is in the void 4C as the final product as it is in the third step. As shown in the figure, the solid inclusion 4D was removed, and a void 4C was formed between the inner and outer cylinders 4A and 4B.

FIG. 10 shows a sixth embodiment according to the present invention.

The sixth embodiment shows an example in which a reduced diameter portion and a neck portion at both ends are bent and spinned. The manufacturing process in this embodiment will be described.

In FIG. 1 and FIG. 2, before the diameter reduction work, the ring plate 26 is located to the right of the position shown in FIG. 1, and each roll 28 has an outer diameter of the material 4 as shown in FIG. 11A. Yori also retreats outward in the radial direction.

Then, a material 4 similar to that of FIG. 4A is fitted onto the clamp surface 13 a of the lower clamp 13 while the rear end of the material 4 is being stuck to a horn 19 ° set at a predetermined position. Then, the driving means 18 is operated to move the upper clamp 17 downward, and the material 4 is clamped by the upper and lower clamps 13 and 17 so as not to rotate. Further, as shown in FIG. 11A, the rotational drive shaft 3 1 Set the position where the extension of the axis of a crosses the extension of the axis X5 of the rotary shaft 21. Further, the rotation driving means 31 is actuated, and as shown in FIG. 11A, the cylindrical axis X 4 of the material 4 is horizontally moved by a predetermined angle θ 1 with respect to the axis X 5 of the rotating shaft 21. Tilt the clamp device 12 horizontally so that it tilts to the right.

Next, the ball spline shaft 8 is rotated in one direction by the driving means 9, and the clamping device 12 is moved to the right side in FIG. 1 along the X direction in parallel with the axis X5 of the rotating shaft 21. As shown in FIG. 11A, each roll 28 is positioned at the starting point A of diameter reduction of the material 4.

From this state (the state shown in Fig. 11A), the motor 22 as the driving means is driven to rotate the roll holder 24 in one direction, and the driving means 25 is operated to advance the ring plate 26. To close the revolving locus of each roll 28 toward the center of the roll holder 24, and drive the driving means 9 to rotate the ball spline shaft 8 in the opposite direction to the previous one, and to clamp the material 12 With 4 move back to the left in Fig. 1 along X direction.

As a result, each port 28 presses against the outer peripheral surface of the material 4 and revolves around the cylinder axis X5 while rotating freely, and the diameter of the revolving locus gradually decreases. It is spun as shown in Figure 11B. At this time, since the cylinder axis X4 of the material 4 is inclined by 01 with respect to the revolving axis X5 of the roll 28, the spun cylinder end is as shown in Fig. 11B. The material 4 is plastically deformed into a frusto-conical taper portion 4b having an axis of revolution X5 inclined by Θ1 from the cylinder axis X4 of the material cylinder 4 (body portion) 4a.

After forming the tapered portion 4b, the roll 4 is held in the closed position, and the material 4 is continuously retracted in the X direction. And a cylindrical neck 4c having an axis of revolution X5 inclined by θ1 is formed by plastic deformation.

Then, the material 4 and the roll 28 are moved backward by the movement reverse to the forward movement of the diameter reduction movement, and the first reciprocating movement completes the first spinning step.

After the above-described first spinning process, each roll 28 is returned to the open position, the driving means 9 is operated to rotate the ball spline shaft 8 in one direction, and the clamping device 1 is rotated. 2 and the material 4 is further advanced in the X direction by a predetermined amount, and each roll 28 is positioned at the point B in FIG. 11C, and the rotary drive shaft 31 is operated to further move the material 4 together with the clamping device 12. After tilting by a fixed amount, as shown in FIG. 11C, the angle 0 2 between the cylindrical axis X 4 of the material 4 and the axis of the rotating shaft 21, that is, the revolving axis X 5 of the roll 28, is set in the first step. The angle is larger than θ1.

Then, in this state, the amount of closing movement of the roll 28 is made larger than that in the first step, and the same spinning processing as described above is performed. As a result, the taper portion 4b formed in the first step is centered on the axis X5 which is inclined by より 2 from the cylinder axis X4 of the raw cylinder portion (body portion) 4a of the material 4. It is plastically deformed into a tapered part 4b with a frusto-conical shape and a large taper angle. After forming the tapered portion 4b, the roll 28 is maintained in the closed position and the material 4 is continuously retracted in the X direction. A neck 4c centering on 5 and having a smaller diameter than the first step is formed. By the above process, as shown in FIG. 12, the tapered portion 4b centered on the axis X5 inclined with respect to the axis X4 is attached to the end of the trunk 4a centered on the axis X4. A reduced diameter portion 4d integrally formed with the neck 4c is formed. In addition, it is not always necessary to tilt the rotary drive shaft 31 only as a reference. If the tilt around the rotary drive shaft 31 and the movement in the X, Y, and Y directions are combined, the freedom of molding is further increased.

Next, the material 4 reduced in diameter by the above-described process is turned upside down, and is again sandwiched by the clamping device 12. By performing the same spinning process as above, the material 4 is bent to both ends as shown in FIG. 13. The spinned tapered portion 4d, 4 _£ 1 and neck 44c can be formed.

Then, after the above-mentioned molding, the product is taken out from the clamp device 12, and the solid inclusion 4D may be left as it is in the void 3C to obtain a final product as it is, or as shown in FIG. The solid product 4D may be removed and a void 4C formed between the inner and outer cylinders 4A and 4B may be used as the final product.

The solid inclusions 4D in the above embodiment may use a thermoplastic resin. Further, a heat insulating member may be used instead of this resin. When this heat insulating member is used, it is preferable to press-fit the heat insulating member around the inner cylinder 4A of the raw material 4 into the outer cylinder 4B in a state of being fixedly wound. Furthermore, since a heat insulating material is originally required in a muffler or a catalytic converter, it is not necessary to remove the solid inclusions 4D even after the shaping. In such a case, the step of removing the solid inclusions 4D can be omitted.

Further, as the solid inclusions 4D, ice that has been frozen after water has been injected into the voids 4C may be used, and further, metal particles (shots) may be used. In addition, those which change into a solid or liquid by heat, such as molten salts such as nitrates and nitrites, and low melting point metals and compounds thereof may be used.

In the above embodiment, the core is inserted into the inner cylinder 4A, but the core may be inserted into the outer cylinder 4B.

In each of the above embodiments, the material 4 may be moved in the cylinder axis direction during the spinning process, the material 4 may be fixed and the spinning roller 28 moved in the cylinder axis direction, or both sides may be moved. You may move it. Further, a means for continuously controlling the driving locus of the roller, that is, the roller in the deformation direction is optional.

In each of the above embodiments, the material 4 is fixed and the spinning roller 28 is revolved. However, the axis X5 of the roll driving unit 3 and the axis X4 of the material driving unit 2 are parallel and the same. If they are set on one line, the material 4 is rotated about its axis and the core metal 51 is also rotated, and the spinning roller 28 is freely rotated without revolving, and in the radial direction. And it may be moved in the cylinder axis direction.

Each of the above embodiments is an example of application to a container of an exhaust system part of an automobile. However, the present invention is also applicable to a general-purpose container and a daily necessity such as a pot. Is not limited.

As an example, an eighth embodiment of the present invention will be described below with reference to FIGS.

This is an embodiment in which the present invention is applied to the material 4 having one end closed in the first embodiment, and is applicable to all containers such as pots, cylinders, and accumulators.

As the first step in FIG. 14A, the material inner cylinder 4A is inserted into the outer cylinder 4B. Thereafter, as shown in FIG. 14B, the solid inclusion 4D is filled in a state where a gap 4C is provided between the inner and outer cylinders to form the material 4 shown in FIG. 14C. Next, as shown in FIG. 14D, similarly to FIG. 4B of the first embodiment, this material 4 is clamped by the clamping device 12 of the above-mentioned spinning machine, and one end of the material 4 is contracted. Perform the second step of diameter reduction.

Due to this spying process, the outer cylinder 4B is reduced in diameter and the deformation force is transmitted to the inner cylinder 4A via the solid inclusion 4D, and the inner and outer cylinders 4A, 4B and the solid inclusion 4D are deformed. Are simultaneously deformed.

That is, a tapered portion 4b that reduces in diameter from the elemental tube portion 4a of the inner and outer cylinders 4A and 4B, and a neck portion 4c that extends from the tip of the taper portion 4b between the inner and outer cylinders 4A and 4B. It is formed in a series with the solid inclusion 4D sandwiched.

Next, the inner and outer cylinders 4A and 4B are cut at the part C shown in Fig. 14D, and the throwaway part 4e is removed.

The above-mentioned spying process is performed in one pass or a plurality of passes of the roller as necessary.

Further, when the core metal 51 is inserted during the spinning process, the neck portion 4c is accurately reduced in diameter by the reduced diameter portion 51a of the core metal 51. Further, as shown in FIG. 14D, the spinning roller 28 moves along the taper portion 51b of the core bar 51 as shown by the arrow in the figure, and the large diameter portion of the core bar 51. 5 Separate outward from 1 c.

As described above, one end of the material 4 is reduced in diameter by spinning.

Then, after the molding process, the molded product is removed from the clamp device 12, and the solid inclusion 4 D may be left as it is in the void 3 C as a final product as it is in the third step. As shown in 14E, as a fourth step, the solid inclusion 4D may be removed, and a void 4C formed between the inner and outer cylinders 4A and 4B may be used as a final product. In this way, a closed container at one end is formed.

Industrial utilization effects

As described above, according to the first aspect of the present invention, a double-structured container having a gap between the inner and outer cylinders is simultaneously transformed into a desired cross section by simultaneously spinning the inner and outer tubes. Since it is possible to perform molding in a simple manner, processing can be facilitated and processing time can be shortened compared to the conventional method, and processing costs can be significantly reduced.

According to the second aspect of the present invention, the inner cylinder is disposed inside the outer cylinder while maintaining a gap, and the inner cylinder is disposed in the gap. The spinning roller revolves while the solid inclusion is sandwiched in at least one section in the cylinder axis direction to spin the outer cylinder, and the cross section of the inner cylinder and the outer cylinder is changed to the cylinder axis of the material of the inner and outer cylinders. On the other hand, by changing the eccentricity at the same time, the inner and outer cylinders eccentrically changed with respect to the cylinder axis of the material can be manufactured with the above-described effects.

According to the third aspect of the present invention, the inner cylinder is disposed inside the outer cylinder while maintaining a gap, and a solid inclusion is sandwiched in at least one section in the cylinder axis direction in the gap, and the material of the inner and outer cylinders is formed. The cylinder axis is inclined with respect to the axis of the spinning roller, and the spinning roller revolves around the outer cylinder to perform the spinning process, and the cross section of the inner cylinder and the outer cylinder is adjusted to the cylinder axis of the material of the inner and outer cylinders. By making the bending change obliquely, the inner and outer cylinders bent and changed with respect to the cylinder axis of the material can be manufactured with the above-mentioned effects.

According to the present invention, furthermore, the core metal can prevent the inner and outer cylinders from being over-deformed, and the desired cross-sectional shape can be reliably obtained. Furthermore, by selecting the arrangement of the core metal, it is possible to change the deformation amount of the inner and outer cylinders to form different cross-sectional shapes, and it is also possible to make the cross-sectional shapes of the inner and outer cylinders different by performing the spinning process on the inner and outer tubes simultaneously.

In the present invention, furthermore, by inserting a core metal into at least one section of at least one of the inner cylinder and the outer cylinder, the work of filling and removing solid inclusions can be performed easily and promptly, thereby improving work efficiency. Can be planned.

Claims

The scope of the claims

1. The inner cylinder is arranged inside the outer cylinder while maintaining a gap, and a solid inclusion is sandwiched in at least one section of the gap in the cylinder axis direction. In this state, the outer cylinder is subjected to a spying process to form an inner cylinder. And simultaneously changing the cross section of the outer cylinder.

2. The method according to claim 1, wherein a cored bar is inserted into at least one section of at least one of the inner cylinder and the outer cylinder before the spinning process.

3. The method according to claim 2, wherein the solid inclusion is a solidified state of a heat-meltable resin, a thermoplastic resin, or a molten salt.

4. The method for producing a double-structure container according to claim 1, wherein the solid inclusion is in a solidified state of a heat-meltable resin, a thermoplastic resin, or a molten salt.

5. The inner cylinder is arranged inside the outer cylinder with a gap, and solid inclusions are sandwiched in at least one section of the gap in the direction of the cylinder axis. In this state, the spinning roller revolves to spin the outer cylinder. Wherein the cross section of the inner cylinder and the outer cylinder is simultaneously changed eccentrically with respect to the cylinder axis of the material of the inner and outer cylinders.

6. The method according to claim 5, wherein a cored bar is inserted into at least one section of at least one of the inner cylinder and the outer cylinder before the spinning process.

7. The method for producing a double-structure container according to claim 6, wherein the solid inclusion is in a solidified state of a heat-meltable resin, a thermoplastic resin, or a molten salt.

8. The method for producing a double structure container according to claim 5, wherein the solid inclusion is in a solidified state of a heat-meltable resin, a thermoplastic resin, or a molten salt.

9. The inner cylinder is disposed inside the outer cylinder with a gap kept therebetween, and solid inclusions are sandwiched in at least one section of the gap in the cylinder axis direction, and the cylinder axis of the material of the inner and outer cylinders is inclined with respect to the axis of the spinning roller. The outer cylinder is revolved and the outer cylinder is revolved to spin the outer cylinder, and the cross section of the inner cylinder and the outer cylinder is bent and inclined with respect to the cylinder axis of the material of the inner and outer cylinders. Method for manufacturing a double-structured container.

10. At least one of the inner cylinder and the outer cylinder should be at least 10. The method for producing a double-structured container according to claim 9, wherein a core is introduced in one section.

11. The method for producing a double-structured container according to claim 10, wherein the solid inclusion is in a solidified state of a heat-meltable resin, a thermoplastic resin, or a molten salt.

12. The method for producing a double structure container according to claim 9, wherein the solid inclusion is in a solidified state of a heat-meltable resin, a thermoplastic resin, or a molten salt.