JPS58201630A - Manufacture of sealing member - Google Patents

Abstract

PURPOSE:To enable to mass-produce a sealing lip, by a method wherein an elastic sealing substance obtained by primary vulcanization of a synthetic rubber or the like is adhered to a metallic reinforcing plate, the resultant material is punched into a desired shape, and thereafter the material is heated under compression so that the sealing substance is vulcanized in the condition of being protruded from the reinforcing plate. CONSTITUTION:The elastic sealing substance A formed of a synthetic rubber or the like is adhered to the reinforcing plate B such as a metallic plate or the like through an adhesive or the like. In this case, the sealing substance A is preliminarily provided with projected parts 8a or the like. Next, the integrally adhered article is subjected to primary vulcanization or vulcanized to a degree of slightly lower than that of complete vulcanization, and then it is integrally punched into the desired shape by a punch. Subsequently, the punched sealing member is heated under compression by a hot press so that the sealing substance A is vulcanized and solidified in the condition of being protruded from the reinforcing plate B on both the inner periphery side and outer periphery side of the plate B to obtain a sealing lip 10.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a sealant that can be obtained continuously and that does not require post-treatment.

Conventionally, as shown in Fig. 1, the sealing material used for the rotating parts of machines is a reinforcing ring 1 punched out of a metal plate into a circular shape, the surface of which is treated, an adhesive is applied, and then the sealing material is placed in a lower mold 4. The reinforcing ring 1 and the elastic sealing member 2 are placed in the reinforced ring groove 5, and the elastic sealing member 2 made of synthetic rubber is supplied thereto. Previously, the reinforcing ring 1 was bonded with sulfur and molded into the desired shape, but with this method, the reinforcing ring 1 was accurately placed in the reinforcing ring groove 5, an elastic sealing member was supplied thereto, and after molding, there were no steps such as removing the molded product. This molding method requires tedious work, and the excess elastic sealing member is always taken out as part 6 along with the molded product.
The outflow barrier is formed externally and it is impossible to eliminate these particles.

Therefore, there are many problems in terms of workability, economy, etc., such as the huge cost and time required to remove the paris, which is the biggest drawback of mass production.

In addition, the sealing lip of small-diameter sealing materials used for small-diameter bearings, for which demand has been increasing in recent years, is small, and even if a small amount of pars adheres or the sealing lip is scratched, it can cause sole defects, making the process of removing pars even more troublesome. However, it had the disadvantage of producing many defects.

The present invention eliminates these drawbacks and provides an excellent method for manufacturing a sealing material that improves the width of mass production, improves workability, and improves economic efficiency.

The present invention will be explained based on the drawings. As shown in FIG. 2, an elastic sealing member A made of synthetic rubber or the like is adhered to a reinforcing plate B of a sealing material made of metal or the like via an adhesive or the like. At this time, the second
As shown in the figure, the elastic sealing member A may be in the shape of a flat plate.
As shown in the figure, a protruding part 8a having a rectangular cross section that is approximately the same size as the sealant and protrudes from the center on both the inner and outer circumferential sides is provided at the punched part of the sealing material, or as shown in Fig. 4. By making the convex portion 8b continuously raised at the shoulders on the inner periphery and the outer periphery or having a triangular cross-sectional shape, the sealing lip during molding of the sealing lip during compression vulcanization solidification in the subsequent process is improved. The shape is easy to control.

In this way, the reinforcing plate B of the sealing material and the elastic sealing member A, such as synthetic rubber, are bonded together, and acrylic rubber, fluororubber, fluorine rubber, etc. are made by applying primary filtration, and nitrile rubber is made by completely adding filtration. Vulcanized to just one step before sulfurization,
As shown in FIG. 5, the sealant is punched out into the desired sealant shape using a punch.

At this time, when the elastic sealing member A is provided with a protrusion 8a18b as shown in FIGS. 6 and 4, the elastic sealing member A is sealed according to the shape of the protrusion 8a and 3b as shown in FIGS. The sealing material is punched out using a punch so that the convex portions 8a and 8b are located on the inner and outer circumferential sides of the material.

The sealing material obtained by punching out the reinforcing plate B and the elastic sealing member A into a sealing material shape is compressed and heated using a heat press as shown in Figure 8, and the elastic sealing member A is placed on the inner circumferential side of the reinforcing plate B. When compression vulcanization is performed and solidified so as to protrude toward the inner and outer circumferential sides, the elastic sealing member A can be caused to protrude from the reinforcing plate B in the inner and outer circumferential directions to form a sealing lip 10, as shown in FIG. I can do it.

At this time, the shape of the sealing lip 10 is controlled by the cross-sectional shape of the elastic sealing member A.

In the case of a flat surface as shown in FIG. 5, the sealing lip 1o protruding from the inner and outer circumferential sides of the triangle can be formed with a small amount. As shown in FIG. 6, if the convex portion of the concave cross section is square, or if the upper part of the square is rounded, the sealing lip 1o can be formed into a rounded shape. If it is desired to increase the amount of protrusion of the sealing lip 1o and to make the tip sharp, the sealing lip 10 can be made as shown in FIG. It can be formed in a shape close to a triangle on the inner and outer circumferential sides.

In this way, by combining the cross-sectional shape of the elastic sealing member, its wall, and the compressive strength, you can freely create the desired sealing lip 10.
can be obtained. Therefore, in the cross-sectional shape of the elastic sealing member A, as shown in FIG. When a sealing material having an elastic sealing member A having the shape is compressed and vulcanized, a sealing lip 10 having a sharp tip with high sealing properties is formed on the inner circumference side, and a voluminous and rounded sealing lip 10 is formed on the outer circumference side, as shown in Fig. 11. It has a shape with a sealing lip 1o, and the outer sealing lip 1o is suitable for fitting into the outer ring fitting groove of the bearing, and the inner sealing lip 1o is suitable for exerting a seal effect by coming into contact with the inner ring that is in contact with the rotating shaft. It is the shape. Of course, depending on the application, the seal may have opposite shapes on the inner and outer sides, and as described above, the shape of the sealing nozzle can be easily selected depending on the purpose of use.

In the present invention, the elastic sealing member A is vulcanized after bar vulcanization, such as acrylic rubber, fluorine rubber, or rubber, and nitrile rubber is vulcanized to one step before complete vulcanization, and then punched into the shape of the sealant. Although the amount of protrusion of the seal 1o is larger in the case where this is not done, there is sagging and lateral flow, and the flow of the rubber becomes average. Because it's easy,
For this reason, after pre-pre-vulcanization or after vulcanization before complete vulcanization, if the material is punched into the shape of the sealant and then compressed and vulcanized to solidify it, the material will not sag or cross-flow, and the material will not sag or flow. This is because when compressed, the material is extruded sideways on average due to the repulsive force of , and the desired sealing lip can be obtained.

As described above, according to the present invention, a large number of conventional expensive molds are prepared, and processes such as alignment of reinforcing rings, placement of elastic sealing members, vulcanization, removal, deburring, etc. No work is required, and it is easy to mold large quantities at once (punching and compression vulcanization can be done in large quantities at the same time).
Since there is no extra material supplied during molding of the sealing lip, there is no need for troublesome deburring work, and this effect is particularly noticeable in extremely small diameter sealing materials for extremely small diameter hair rings, which have become important in recent years. This is an ideal method of manufacturing a sealing material that is completely different from conventional methods.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional method of manufacturing a sealing material. Second
The figure is a cross-sectional view of the sealing material of the present invention. 6 and 4 are perspective, partially cut away views of other embodiments of the sealing material. FIG. 5 is a sectional view of the sealing material of the present invention in a punched state. FIGS. 6, 7, and 10 are cross-sectional views of other embodiments similarly punched out of the sealing material. FIG. 8 is a cross-sectional view of the process of molding the sealing lip. FIG. 9 is a cross-sectional view of the sealant. FIG. 11 is a sectional view of one embodiment of the sealing material. A... Elastic sealing member B... Reinforcing plates 8a, 8b
...Convex portion 10 of elastic sealing member...Sealing lip patent applicant Uchiyama Kogyo Co., Ltd.

Claims (2)

[Claims] (1) An elastic sealing member such as synthetic rubber is adhered to a reinforcing plate of a sealing material made of metal, etc., and the elastic sealing member and reinforcing plate are vulcanized to a stage just before secondary vulcanization or complete vulcanization. At the same time, after punching out the sealing material into a desired shape with a punch, when the elastic sealing member is compressed and vulcanized to solidify, the elastic sealing member is made to protrude inwardly and outwardly from the reinforcing plate to form a sealing lip. A method for producing a sealing material characterized by: (2) When the elastic sealing member is attached to the reinforcing material, the inner circumferential side and the outer circumferential side of the portion of the elastic sealing member punched out in the sealing material are respectively made to protrude from the central part. The method for manufacturing the sealing material according to paragraph 1.