JP2714820B2 - Manufacturing method of anti-vibration rubber fittings - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing an anti-vibration rubber fitting used in a bush or a bush-type engine mount by being pressed into a fitting such as a bracket.

[Conventional technology]

As shown in FIG. 7, the production of the conventional anti-vibration rubber bracket is as follows.
The raw material 100 wound into a roll is sent to a forming step A for forming a cylindrical shape with a large number of rollers, and the joined portion of the cylindrical shape is sent to a step B for welding with a high-frequency welding machine 101. Next, after passing through a bead cutting step C in which a portion where the butted portion is welded is cut by the bead cutter 102, a step D in which the cut welding portion is cooled by the cooler 103 is passed. Further, a step E of cutting the cooled pipe to a predetermined length by the cutter 105 is performed. The cut pipe becomes the original pipe 106. The original tube 106 is called an electric resistance welded tube because its butt portion is welded by high frequency welding. In order to obtain predetermined dimensions (inner diameter and outer diameter), the original tube 106 (electrically welded tube) requires an additional die passing (drawing) step, and after passing through the die passing step, is cut into a desired size. Thus, metal fittings 107 for the vibration-proof rubber were formed. In some cases, the welded part is finished using a grinder instead of the bead cutter 102.

[Problem to be solved]

In the conventional method, the welded portion swells and a convex portion is formed, which makes it difficult to press-fit the bracket during press-fitting. Therefore, it was necessary to cut off the convex portion of the welded portion. Further, since such a shaving operation is required, the cost and the number of steps are naturally inevitable. The length of the raw tube 106 is usually 3
55 m, and the transport efficiency of the raw tube 106 was poor, and the space for storing the material required a lot of space. Furthermore, if the original tube 106 is cut as it is, it is difficult to obtain a predetermined size, so a drawing step is necessary, which further increases the cost and the number of steps. It was troublesome to cut to the desired length.

Therefore, the present invention provides a method for manufacturing a vibration-proof rubber fitting at a low cost, easily and in a short time without requiring a bead cutting step, a grinder finishing step, a step of cutting to a desired size, and a drawing step. The purpose is to:

[Means for solving the problem]

In order to achieve the above-mentioned object, the present invention provides a vibration-proof rubber by press-fitting a rubber-like vibration-proof rubber fitting into a bracket or other fitting to form a vibration-proof rubber by vulcanizing and bonding rubber to a cylindrical vibration-proof rubber fitting. A method of manufacturing an anti-vibration rubber fitting for manufacturing an apparatus, wherein a sheet metal having a width corresponding to a finished circumferential dimension is punched at a required interval, and the punched piece is processed into a cylindrical shape to form a cylindrical body. Then, the butted portions of the formed cylinders are joined by inert gas arc welding.

[Action]

In the present invention, a long original tube is not required, and a sheet metal having a width corresponding to a finished circumferential dimension is punched at a required interval in the width direction, and the punched one is processed into a cylindrical shape. A vibration-proof rubber fitting that can be used in general can be formed, and by joining the butted parts of this cylindrical shape by inert gas arc welding, a convex part like a conventional welded part can not be formed, and Pressing is performed smoothly. Inert gas arc welding is performed by melting the base material of the butted part and welding, so the convex part is less than 0.3 mm, there is almost no spatter, and it can be easily attached to the bracket without the welding part finishing process (bead cut processing or grinder finishing processing) Press-fitting becomes possible.

〔Example〕

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

As in the prior art, the raw material wound into a roll is fed to a press machine, and the press machine punches out a sheet metal 1 having a width corresponding to the finished circumferential dimension at a required interval in the width direction. That is, cutting may be performed by, for example, a press provided with a cutter.
The stamped sheet metal 1 shown in FIG. 1 is processed into a cylindrical shape by roll winding or press winding to form a cylindrical body 2 as shown in FIG. The portion of the butt portion 2A of the cylinder 2 is inert-gas arc welded.
g). In this inert gas arc welding, as shown in FIG. 3, a tungsten rod 3 is used as an electrode, and an inert gas 4 is injected from a gas nozzle 5 to a butt portion 2A to blow arc heat. Since the material used for the anti-vibration rubber fitting is the sheet metal 1 having a thickness of 3 mm or less, it is possible to perform welding using only arc heat without using a welding rod. In general arc welding or gas welding, it is necessary to use flux, but in inert gas arc welding, it is necessary to use flux because it is welded in inert gas, and mechanical or chemical to remove slag or residual flux after welding. No processing is required. In addition, the inert gas arc welded portion is superior in ductility, strength, airtightness, and corrosion resistance as compared with other arc welded or gas welded welded portions.

The cylindrical body 2 to which the butted portion 2A is welded by the inert gas arc welding in this manner is set in a mold, and rubber is injected and vulcanized. Before vulcanizing the rubber in such a mold, the cylindrical body 2 is drawn as shown in FIG.
By pressing the upper mold 6 from above, the drawn portions 21 and 22 can be press-formed on both end surfaces of the cylindrical body 2. Reference numeral 7 in FIG. 4 indicates a lower mold. The cylindrical body 2 having such drawn portions 21 and 22 is set in a mold and the rubber is vulcanized. FIG. 5 shows the manufactured cylindrical anti-vibration rubber, and the inner cylinder 23 and the outer cylinder 24 respectively constitute anti-vibration rubber fittings. The inner cylinder 23 and the outer cylinder 24 are both manufactured by the above-described manufacturing method. Inner cylinder 23
The rubber 8 is interposed between the outer cylinder 24 and the outer cylinder 24. Also, the outer cylinder
Only the cylinder 2 constituting the 24 was subjected to drawing as shown in FIG. 4 before vulcanizing the rubber. , This is the fourth
Drawing may be performed by a method as shown in the figure. In this manner, the drawing of the rubber product can be performed simultaneously with the drawing of the outer cylinder 24.

The anti-vibration rubber 9 manufactured in this manner is attached to the bracket 10.
6, it is not always necessary to draw both ends of the cylindrical body 2 and the inertia gas arc welded cylindrical body 2 can be smoothly mounted on the bracket 10 or the like. Can be press-fitted.

〔effect〕

As described above, according to the present invention, rubber is vulcanized and adhered to a cylindrical anti-vibration rubber fitting to form an anti-vibration rubber, and the anti-vibration rubber is pressed into a bracket or other metal fitting. A method of manufacturing an anti-vibration rubber fitting for manufacturing a device, forming a cylindrical body formed by punching a sheet metal having a width corresponding to a finished circumferential dimension at a predetermined interval and processing the sheet metal into a cylindrical shape,
Since the butted portions of the formed cylinders are joined by inert gas arc welding to manufacture the vibration-proof rubber fitting, the welded portion does not rise as in the conventional case, and post-processing of the welded portion is unnecessary. Further, since the welded piece is punched to a required size, the cost can be reduced by 10 to 30% as compared with a conventional method of cutting from an electric resistance welded pipe. Furthermore, there is no need to store and transport as a long pipe-shaped object as in the prior art, so that transportation costs and storage space can be reduced. According to the present invention, the number of steps and the manufacturing cost can be significantly reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a sheet metal punched to a required size by a press machine or the like, FIG. 2 is a perspective view showing a state in which the sheet metal is processed into a cylindrical shape, and FIG. 3 is an enlarged sectional view at the time of inert gas arc welding. FIG. 4 is a cross-sectional view showing an example in which both ends of a cylindrical body are subjected to drawing, FIG. 5 is a cross-sectional view showing a manufactured vibration-isolating rubber,
FIG. 6 is a perspective view showing a state in which the rubber is pressed into the bracket, and FIG. 7 is an explanatory view showing a conventional manufacturing method. 1 ... sheet metal, 2 ... cylinder. 2A ... Butt, 8 ...
Rubber, 9: Anti-vibration rubber, 10: Bracket, 23, 24 ...
Anti-vibration rubber bracket

Claims (1)

(57) [Claims] An anti-vibration rubber (9) is formed by vulcanizing and bonding a rubber (8) to a cylindrical anti-vibration rubber fitting (23, 24), and the anti-vibration rubber (9) is attached to a bracket (10). This is a method of manufacturing a vibration-proof rubber fitting for manufacturing a vibration-proof rubber device by press-fitting into a metal fitting such as a metal sheet, and punching a sheet metal (1) having a width corresponding to a finished circumferential dimension at a required interval. A process for manufacturing a vibration-proof rubber fitting, characterized in that a cylindrical body (2) is formed by processing the product into a cylindrical shape, and the butted portion (2A) of the formed cylindrical body (2) is joined by inert gas arc welding. Method.