JPH035026A - Manufacture of cylindrical metal tool having flange - Google Patents

Abstract

PURPOSE:To save machining by cutting, etc., and to improve manufacture of a cylindrical metal tool having flange by bringing a forming roller into contact with inner circumferential face at end part of a metal pipe and relatively rolling the forming roller while applying pressurizing force toward outer direction to the radius direction to extend the end part of the pipe to a flange state. CONSTITUTION:The forming roller 24 having flange forming face 22 is brought into contact with the inner circumferential face at the end part of the large diameter part 16 in the cylindrical metal tool having stepped part forming the large diameter part 16 and the stepped part 18 at the one end of the metal pipe 11 with the forming roller 14. Successively, the forming roller is pushed against the above part toward axial direction while rolling. Then, the end part of the large diameter part 16 is extended toward the outer direction as the flange state to form the finish product-shaped flange 34 along the flange forming face 22 int the forming roller 24. Further, the above manufacturing method may be applied to the manufacture of the cylindrical metal tool 42 having flange without the large diameter part 16, too.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a method for manufacturing a flanged cylindrical metal fitting.

(Prior art) As shown in FIG. 4(A), one kind of vibration-proof rubber is a cylindrical inner metal fitting loo, a similarly cylindrical outer metal fitting 102, and a rubber metal fitting disposed between them. There is a bush-shaped type consisting of a rubber elastic body 104.

This anti-vibration rubber bushing 106 has a flange 108 formed at the end of the outer cylindrical metal fitting 102, and is press-fitted into its mounting hole 110 until the flange 108 hits a mating member 109, as shown in FIG. It is designed to be mounted and held at a predetermined location on a vehicle or the like.

Therefore, when manufacturing the outer cylindrical fitting 102 of the vibration-proof rubber bushing 106, it is necessary to mold the flange lO8.
The method shown in the figure was used. In the figure, 112 is a long metal tube such as a drawn steel tube, which is first cut into a predetermined length. Then, as shown in (B), the cut metal pipe 112 is set in the holding hole 118 of the gold fil 14, and the other mold 116 equipped with the corresponding pin 119 and flange forming surface 115 is closed, and the metal pipe 112
(see (C)), and then press the flange 10 in the axial direction (see (C)).
8 is molded together with the large diameter portion 121 which becomes a substantial press-fit fixing portion. Thereafter, the end of the tube opposite to the flange 108 is finished by cutting and chamfering.

(Problem to be solved by the invention) By the way, in such a processing method using a press, the mold 1
14 and the outer peripheral surface of the metal pipe 112, and between the pin 119 of the mold 116 and the inner peripheral surface of the metal pipe 112, it is necessary to provide a predetermined amount of clearance. The portion sandwiched between the pin 119 and the inner wall surface of the holding hole 118 (the small diameter portion 122 of the outer cylinder fitting 102) will be deformed. For this reason, after the press working, it is necessary to cut the outer circumferential surface and inner circumferential surface of the small diameter portion 122 to obtain the dimensions.

However, such machining not only increases losses, but also requires a lot of effort and time for machining, which reduces product production efficiency and increases product costs. Become.

Further, problems arise such as cutting oil, smoke, or cutting debris scattering during cutting, deteriorating the working environment.

(Means for Solving the Problems) The present invention has been made to solve the above problems, and its gist is a method for manufacturing a cylindrical fitting having a flange at the end from a metal pipe, A forming roller having a flange forming surface and rotatable around its own axis parallel to the axis of the metal pipe is brought into contact with the inner circumferential surface of the end of the metal pipe, and in this state, a forming roller is placed on the end of the metal pipe. The flange is formed by moving the forming roller relative to the metal pipe while applying a radially outward pressure force to the metal pipe to spread it out into a flange shape at the end of the metal pipe. .

(Operations and Effects of the Invention) As described above, the present invention is configured to expand the end portion of a metal pipe into a brim shape using the outward pressing force of the forming roller, thereby forming a flange. Therefore, unlike the above-mentioned conventional method, axial compressive force is not suddenly applied to the metal pipe during flange forming. There is no need for mechanical processing. This greatly reduces the time required to manufacture metal fittings by one hour.
Also, material loss will not occur.

Furthermore, the present invention has the advantage that there is no need to use a forming die, and there is no problem of deteriorating the working environment due to scattering of cutting waste, cutting oil, etc. In addition, since the process is based on the transfer of forming rollers, There are various advantages such as low processing noise and easy setup changes.

(Example) Next, embodiments of the present invention will be described in detail based on the drawings.

In FIG. 1, reference numeral 10 is a drawn steel pipe, which is first cut into predetermined lengths to prepare a metal pipe 11. next(
As shown in B), a forming roller 14 having a rotation axis 12, a large diameter forming surface 15 and a stepped forming surface 20,
The end of the metal pipe 11 is brought into contact with its inner circumferential surface,
Then, with the other end of the metal pipe 11 fixed, the forming rollers 14 are rolled along the inner circumferential surface of the pipe while applying an outward pressing force to the inner circumferential surface of the pipe. Then, push it in the axial direction to remove the metal pipe 1.
1 outward from its ends. As a result, a large diameter portion 16 and a stepped portion 18 are formed at one end of the metal pipe 11, and a relatively small diameter portion 38 is formed at the other end. Furthermore, since the small diameter portion 38 is not subjected to any processing,
The diameter is kept the same as the original metal pipe 11.

Next, as shown in (G), a forming roller 24 having an axis 12 and a flange forming surface 22 is attached to the metal pipe 11
The large diameter portion 16 is brought into contact with the inner circumferential surface of the end thereof, and pushed in the axial direction while rotating and revolving (transferring).

Then, the end of the large diameter portion 16 is pushed outward into a brim shape, and is formed into a flange 34 in the shape of the final product along the flange forming surface 22 of the forming roller 24.

After forming the flange 34 in this way, (I)
) As shown in FIG.
The tube ends of the small diameter portion 38 are rotated and rolled so that the tube ends of the small diameter portion 38 are chamfered. At this time, the length of the small diameter portion 38 in the axial direction becomes somewhat longer. Therefore, in this processing, it is necessary to make the length after processing match the length in the final product shape.

As a result of the above, the flange 34. Large diameter portion 16. The machining of the outer cylindrical fitting 35 having the stepped portion 18 and the small diameter portion 38 is completed.

As described above, in the method of this example, the flange 34 is formed by plastically deforming the tube end while pressurizing it outward by the forming roller 24 having the flange forming surface 22.

Therefore, unlike the conventional method of compressing the raw metal pipe 11 in the axial direction to form a flange, the small diameter portion that is not particularly processed is not deformed.

Therefore, there is no need to perform machining such as cutting to obtain dimensions after the molding process, which simplifies the manufacturing process of the outer cylinder fitting 35, saves 9 hours of labor, and eliminates material loss. The various advantages described above, such as lower processing costs and better working environment, result.

Although the embodiments of the present invention have been described in detail above, the present invention can be implemented in other embodiments.

For example, in the above example, the large diameter portion 16 is first formed (step (B)).
After that, flange processing (step (C)) is performed, and as shown in FIG. 2, the stepped part molding surface 20. Large diameter molding surface 15. It is also possible to perform steps (B) and (C) above in one step using a forming roller 40 provided with a flange forming surface 22.

Furthermore, as shown in FIG. 3, it is of course possible to apply the present invention to the production of a flanged cylindrical fitting 42 that does not have a large diameter portion 16, and it is also possible to apply the present invention to the production of a cylindrical fitting made of a metal material other than steel. It is also possible to apply the present invention in this case.

In addition, in the above example, the metal pipe side is fixed and the forming roller side is rotated to plastically process the metal pipe, but in contrast to this, the forming roller side is fixed,
The present invention is based on the knowledge of those skilled in the art without departing from the spirit of the invention, such as that it is possible to plastically process a metal pipe by rotating one side of the metal pipe, or in some cases by rotating both sides. , it is possible to implement it in various modified forms.

[Brief explanation of drawings]

FIG. 1 is a process explanatory diagram of a method for manufacturing a flanged cylindrical fitting according to an embodiment of the present invention, FIG. 2 is an explanatory diagram of another embodiment of the method of the present invention, and FIG. FIG. 4(A) is a cross-sectional view showing another form of the metal fitting to which the present invention is applied, and FIG. FIG. 5 is an explanatory diagram of a method of press-fitting and mounting a vibrating rubber bushing, and FIG. 5 is an explanatory diagram of a conventional manufacturing method of an outer cylindrical metal fitting in the same vibration-proofing rubber bushing. 11: Metal pipe 12 biaxial center 22: Flange forming surface 24.40: Forming roller 34: Flange 35: Outer cylinder metal fitting

Claims (1)

[Claims] A method for manufacturing a cylindrical metal fitting having a flange at the end from a metal pipe, the metal pipe having a flange forming surface and being rotatable about its own axis parallel to the axis of the metal pipe. The forming roller is brought into contact with the inner peripheral surface of the end of the metal pipe, and in this state, the forming roller is moved relative to the metal pipe while applying a radially outward pressing force to the end of the metal pipe. A method for manufacturing a flanged cylindrical fitting, characterized in that the flange is formed by rolling the end of the metal pipe into a brim shape.