JP3371641B2 - Manufacturing method of stepped cylindrical fittings - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a stepped cylindrical metal member made of a relatively thin plate material used as a constituent member for a vibration-proof rubber such as a cylindrical bush of a vehicle, an engine mount or a cab mount. It is a thing.

[0002]

2. Description of the Related Art Conventionally, a stepped cylindrical metal fitting 1 shown in FIG.
1, as shown in FIG. 5, by pressing in the first step,
After punching out the hole 3d, the plate member 3 having a predetermined length and width was formed from the plate material by punching the outer shape. Then, in the second step, the plate-shaped member 3 is rolled in the longitudinal direction by roll bending to form the cylindrical member 105, and in the third step, by welding, both end surfaces 3x in the longitudinal direction of the cylindrical member 105,
3y are butted and the butted abutment surface is welded line 105.
It was welded as a. Then, in the fourth step, step processing is performed by pressing, but the step processing is performed by the cylindrical member 1
The both side end portions of 05 are left undeformed, and the central portion sandwiched between them is radially reduced, so that both side end portions 1
The stepped cylindrical metal fitting 11 as shown in FIG. 1 (B) was manufactured by forming 1b and 11b and forming the intermediate portion 11c. Then, the stepped cylindrical metal fitting 10 shown in FIG.
Is the hole 3 in the first step of the stepped cylindrical metal fitting 11 described above.
It was manufactured by forming the plate-shaped member 3 without d.

[0003]

However, in this method, in order to manufacture the stepped cylindrical metal fittings by using press, roll bending, welding, pressing, and different processing equipment for each manufacturing process, a step is performed between each process. Operations such as transportation and storage of the items were required, and production adjustment and management of each process were required.

For this reason, there has been a problem in that the labor due to the transportation and storage of these work-in-progress products and the cost due to production adjustment and management increase the cost as a whole.

The present invention has been invented in view of the above problems, and by using the same type of processing equipment even in continuous processes, it is possible to reduce the problems of work-in-process management and work labor between processes. Therefore, it is an object of the present invention to eliminate the cost required for them, thereby reducing the manufacturing cost, and to provide the stepped cylindrical metal fitting at a lower price.

[0006]

In order to solve the above-mentioned problems, the invention of the present application comprises a first step of forming a plate-shaped member having a predetermined length and width by punching an outer shape from a plate, and the plate-shaped member A second step of forming a stepped member by stepwise forming in the width direction, and a stepped member in which this stepped member is separable
By winding it around the main roll, it is rolled in the length direction and the middle part
It is configured to include a third step of forming a reduced diameter cylindrical member and a fourth step of abutting both end surfaces in the length direction of the cylindrical member and welding the abutting abutting surfaces.

After punching a predetermined hole in the plate material,
The outer shape of the hole is punched to adjust the outer shape of a predetermined length and width to form a plate member with a hole from a plate material.
It can also be characterized as being a process.

[0008]

In the invention according to claim 1 configured as described above, since the pressing work in the second step is performed subsequent to the pressing work in the first step, both press machines are continuously used as processing equipment. The same type of processing equipment can be used in the process.

Further, in the invention according to claim 2 configured as described above, while the feature of the invention according to claim 1 is utilized, the work of punching the hole by the press machine is inserted in the first step. The stepped cylindrical metal fitting with the hole can be easily manufactured.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. First, the stepped cylindrical metal fitting 10 is shown in FIG. Figure 1
As shown in (B), a stepped cylindrical metal fitting 11 with a hole formed by forming a hole 11d at a substantially central portion in the length direction of the cylindrical metal fitting.
There is.

The above-mentioned stepped cylindrical metal fitting 10 is shown in FIG.
As shown in (A), it has a welding line 10a and is formed by winding a plate-shaped member having a predetermined size to form a cylindrical member, and butt-welding both end faces in the length direction of the cylindrical member.
Then, side ends 10b and 10b are provided at both ends of the cylindrical member, and an intermediate portion 10c of an intermediate portion thereof is reduced in diameter so that the outer diameter dimension thereof is slightly larger than that of the side end portions 10b and 10b. It is getting smaller.

Similarly, as shown in FIG. 1B, the stepped cylindrical metal fitting 11 having a hole has a welding line 11a and is formed into a cylindrical member by winding a plate member having a predetermined size. It is formed by butt-welding both end faces in the length direction. The side ends 11b, 11b are provided at both ends of the cylindrical member.
Is provided, and the intermediate portion 11c of the intermediate portion is reduced in diameter so that the outer diameter dimension thereof is slightly smaller than the outer diameter dimension of the side end portions 11b, 11b. A hole 11d is formed in the intermediate portion 11c. That is, the stepped cylindrical metal fitting 11
However, the difference from the stepped cylindrical metal fitting 10 is that the hole 11d is formed.

Therefore, a description of one embodiment of the present invention is given in FIG.
The stepped cylindrical metal fitting 11 having the hole 11d shown in FIG. 1B will be mainly described, and the stepped cylindrical metal fitting 10 shown in FIG.
With regard to, only points different from the stepped cylindrical metal fitting 11 will be described.

As shown in FIG. 2, the stepped cylindrical metal member 11 is manufactured through four steps from a first step to a fourth step.

First, in the first step, the press work
The plate member 3 is formed. For this reason, in this embodiment, as shown in FIG.
In C, a steel plate 1 having a thickness of 1.6 mm is used as a plate material for manufacturing the stepped cylindrical metal fitting 11, and the steel plate 1 is pressed by a press machine (not shown).
Sent to the punching dies 22a and 22b, and the holes 3d and 3d
And then sent out to the outer shape punching dies 2a and 2b of a pressing machine (not shown) to form a plate-shaped member 3 having a predetermined length and width corresponding to the finished size of the cylindrical member into a rolled steel plate 1
It is formed by punching the outer shape at a predetermined interval from.
When manufacturing the stepped cylindrical metal fitting 10, it is not necessary to process the holes 3d and 3d by the punching dies 22a and 22b.

In the second step, the stepped member 4 is formed by stepwise molding in the width direction of the plate-like member 3 by pressing. That is, the both end portions 4b, 4b in the width direction of the plate-like member 3 are positioned on the horizontal plane of the same level, and the intermediate portion 4c sandwiched between the both end portions 4b, 4b.
Are protruded in parallel from both side end portions 4b, 4b and are step-molded.

In the third step, the cylindrical member 5 is formed by roll bending. That is, the stepped member 4 is formed by rolling in the longitudinal direction.

As shown in the third step of FIG. 2, the roll apparatus used in the roll bending in the third step has a structure similar to that of a normal roll apparatus including a main roll 6 and sub-rolls 7, 7. It is the same. However, since the step member 4 is roll-bent and molded into the cylindrical member 5 instead of the flat plate member,
The molded cylindrical member 5 has a shape in which the diameter of the intermediate portion is reduced as compared with the outer diameter of both ends. Therefore, after the roll forming, due to the diameter reduction of the intermediate portion, the formed product cannot be pulled out and taken out in the axial direction like a normal straight cylindrical member wound with a flat plate material. Therefore, in the roll device used for this, as shown in FIG. 4, the main roll 6 is composed of main rolls 6e and 6e which are divided into two, and the main rolls 6e and 6e are slidable in the axial direction and can be separated from each other. It is supported in a simple state. At the time of molding, both end faces 6f, 6f of the main rolls 6e, 6e are brought into contact with each other, and at this time, the spigots 6g are fitted to each other and integrally engaged while maintaining the concentricity and strength. Formed as. And the main roll 6
After the stepped member 4 inserted from the tangential direction is wound around the main roll 6 to form the cylindrical member 5 having a predetermined size, the main rolls 6e and 6e are slid in the axial direction to both end faces 6f and 6f.
Are separated from each other to form a gap 8 between the main rolls 6e, 6e, and the molded cylindrical member 5 is taken out from the gap 8. Since the main roll 6 is formed by winding the cylindrical member 5 in this manner, the outer diameters of the both end portions 6b, 6b of the main rolls 6e, 6e are the inner diameters of the both end portions 11b, 11b of the stepped cylindrical metal fitting 11. The outer diameters of the intermediate portions 6c, 6c sandwiching the same are equal to the inner diameter dimension of the intermediate portion 11c of the stepped cylindrical metal fitting 11.

Then, in the fourth step, by welding work,
Both end surfaces 4x, 4y in the length direction of the cylindrical member 5 are abutted, and the abutted contact surfaces are welded as a welding line 11a. Although resistance butt welding is used for welding, other welding methods such as plasma welding may be used.

As described above, the stepped cylindrical metal fitting 11 is formed through the first step to the fourth step. By making it possible to bend the stepped member by roll, press, press, roll bending, and welding are performed in this order. The manufacturing process can be configured, and the press work of the first process and the press work of the second process, which is the next process, are performed.
It can be continuously manufactured using a press which is the same type of processing equipment.

Needless to say, the present invention is not limited to the above embodiments, and various modifications can be made within the scope of the claims based on the spirit of the present invention. For example, in this embodiment, SPHC was used as the plate material 1, but the stepped cylindrical metal fitting 1
Other materials are not limited as long as they are materials used as 0 and 11.

Although the roll device is shown as a three-roll device, the number of sub-rolls is not necessarily two, and a roll device capable of forming the stepped member 4 into the cylindrical member 5 even if the number is more than two. I wish I had it. In addition, the main roll 6e,
Although it has been described that 6e is slid in the axial direction with respect to each other to separate the both end surfaces 6f, 6f and the gap 8 is formed between them, the mutual sliding of the two rolls 6e, 6e in the axial direction is relative. Even if one slides and one is fixed, a structure that creates the gap 8 may be used.

[0023]

As described above, according to the present invention, the stepped cylindrical metal fitting is manufactured through the first to fourth steps.
The press of the process and the press of the second process, which is the subsequent process, were configured by the press, which is the same type of processing equipment. This makes it easier to adjust the production speed between processes, as compared to the conventional manufacturing process, in which the pressing process in the first process is changed to different processing equipment such as roll bending in the second process. Management becomes easy, and since a press machine within the installation area of the same type of equipment is used, it is not necessary to carry or store work-in-process between processes. Further, it is easy to directly connect the processes with the same type of equipment and automate the process. In this case, the process can be substantially constituted by one process, and the problem between the processes can be completely solved. Therefore, in the conventional manufacturing process, since the work-in-process of the cylindrical member is manufactured in the second process, it is necessary to transport the bulky cylindrical member between the second and third processes and between the third and fourth processes.
Although storage was necessary, in the present invention, since the cylindrical member is manufactured in the third step, it is necessary to carry and store the bulky cylindrical member only between the third and fourth steps, which requires labor and time. Storage space is simplified. In this way, the manufacturing cost can be reduced by eliminating the problem of labor and management of work-in-process between steps.

[0024]

[Brief description of drawings]

1 is a perspective view of a stepped cylindrical metal fitting produced according to the present invention, wherein (A) shows the stepped cylindrical metal fitting according to claim 1,
(B) shows a stepped cylindrical metal fitting according to claim 2.

FIG. 2 is a flow chart for explaining a manufacturing process of the stepped cylindrical metal fitting according to the embodiment of the present invention.

FIG. 3 is a schematic diagram for explaining a method of processing a plate-shaped member according to an embodiment of the present invention.

FIG. 4 is a schematic diagram for explaining a roll bending method using a stepped member according to an embodiment of the present invention.

FIG. 5 is a flowchart for explaining a manufacturing process of a conventional stepped cylindrical metal fitting.

[Explanation of symbols]

1 Steel plate (plate material) 3d hole 3 Plate-shaped members 4x, 4y end face 4 step members 5 Cylindrical member 10a, 11a Contact surface (welding line) 10, 11 stepped cylindrical metal fittings

Claims (2)

(57) [Claims] 1. A first step of forming a plate-shaped member having a predetermined length and width by punching an outer shape from a plate material, and a second step of step-forming the plate-shaped member in its width direction to form a stepped member.
The process and the main row divided into two that can be separated from each other.
By winding it around the roll, it is rolled in the length direction and the middle part is reduced in diameter.
A stepped cylinder comprising a third step of forming a cylindrical member formed into a cylinder and a fourth step of abutting both end surfaces in the length direction of the cylindrical member and welding the abutted contact surfaces. Metal fitting manufacturing method. 2. In the first step of forming a plate member from the plate material according to claim 1, after punching a predetermined hole in the plate material, the outer contour of the hole is punched to form an outer shape having a predetermined length and width. The method for producing a stepped cylindrical metal fitting according to claim 1, wherein the stepped cylindrical metal fitting is arranged in the first step of forming a plate-shaped member having holes arranged therein from the plate material.