JP3607520B2 - Sealing material and manufacturing method thereof - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sealing material such as a bearing seal, a wheel seal, or an oil seal and a manufacturing method thereof, and more particularly to a bearing sealing material that can be continuously mass-produced and a manufacturing method thereof.
[0002]
[Prior art]
Conventionally, as a means for continuously forming a large amount of sealing material, a large number of sealing materials are formed at once using a plurality of connected molds, or an elastic body is formed directly on a band-like or flat reinforcing member. A manufacturing method such as punching is used, and various selections are adopted depending on required performance and shape.
Among these, in the manufacturing method in which an elastic body is directly formed on a belt-like or flat reinforcing member, the following structure has been proposed and implemented in order to ensure sealing performance. More specifically, referring to the drawings, as shown in FIG. 7, an outer peripheral groove 1d having a central hole 1a and several connecting portions 1c is punched and formed in a belt-like or flat reinforcing member 1, and an inner ring is formed. A method of forming a sealing material composed of the annular portion 12 and the elastic body 2 by forming the seal-shaped elastic body 2 on the portion 12 as shown in FIG. 8 and then punching the connecting portion 1c with a punch 4 or the like. Are known. (See, for example, JP-A-60-192117)
[0003]
[Problems to be solved by the invention]
However, the above-described multi-cavity forming method using a plurality of connected forming dies requires a large amount of forming dies, and thus has many difficulties in mold cost and maintenance. In the molding method in which the elastic body 2 is molded between the inner and outer peripheral portions formed in the reinforcing member 1 shown in FIG. 8, the shape is inevitably limited because of the connection punching structure, for example, the center hole 1a. In the structure in which the elastic body 2 is formed by projecting the outer peripheral portion of the annular portion 12 including the outer peripheral groove 1d, when the connecting portion 1c to be cut partially blocks the outer peripheral portion and is mounted on the bearing portion There is a risk of greatly reducing the sealing performance. Furthermore, it represents a drawback that the yield of the reinforcing member 1 is also deteriorated by forming the outer peripheral groove 1d.
For this reason, the present invention has considered a method that can be easily and inexpensively formed in large quantities by improving the configuration of the outer peripheral portion and the modeling method.
[0004]
[Means to solve the problem]
The present invention is a sealing material comprising an elastic sealing material for sealing a bearing portion and a reinforcing material for reinforcing the elastic sealing material. When described with reference to the drawings, a metal material or a synthetic resin material as shown in FIGS. A center hole 1a is provided in a plate-like reinforcing member 1 made of a rigid material such as, and an annular half-cut portion 1b is provided on the outer periphery of the center hole 1a. As shown in FIGS. After the adhesive layer 3 is formed on the annular portion 13 between the 1a half-cut portion 1b, it is integrated with the seal ring-shaped elastic body 2 in the mold as shown in FIG. It is characterized by being formed by separating 1b.
[0005]
Further, it is a manufacturing method of a sealing material that seals a bearing portion, and as shown in FIGS. 1 and 2, a center hole 1a is cut in a plate-like reinforcing member 1 made of a metal material or a synthetic resin material. At the same time, an annular half-cut portion 1b is formed on the outer periphery of the center hole 1a, and the adhesive layer 3 is formed into the annular portion 13 formed by the center hole 1a and the half-cut portion 1b as shown in FIGS. After the coating is formed, it is integrated with the elastic body 2 shaped into a seal ring shape in the mold as shown in FIG. 5, and then the half-cut portion 1b is cut and formed.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
In the present invention, the sealing material is efficiently combined with the punching means and the molding means to continuously and easily form the sealing material. When the center hole 1a is provided in the rigid plate-shaped reinforcing member 1, An annular half-cut portion 1b is provided on the outer periphery, and the adhesive layer 3 is formed only on the annular portion 13 formed by the center hole and the 1a half-cut portion 1b, and the elastic body 2 is molded on the adhesive layer 3 After being fixed, the semi-cut portion 1b is separated to form a sealing material.
[0007]
At this time, the elastic body 2 is shaped into a lip shape or a high adhesion shape that can exert its sealing function to the maximum, and the outer peripheral portion is effective after the semi-cut portion 1b is cut off. The modeling which can ensure a shape is made beforehand.
It is the adhesive layer 3 applied and formed only on the annular portion 13 that allows free shaping of the elastic body, and the portion outside the half-cut portion 1b, that is, the outer portion thereof is the shape of the molded elastic body 2. As shown in FIG. 6, it can be easily separated without causing burrs.
[0008]
【Example】
In one example of the present invention, a stainless steel plate having a thickness of 0.1 mm is used, and a number of center holes 1a having a predetermined size of 9.0 mm are punched out. Each of the semi-cut portions 1b is half-cut (half blank). Next, an adhesive is applied to the inside of the half cut (half blank) and baked to form, and then a large number of seal-shaped elastic bodies 2 are vulcanized and bonded by compression molding, injection molding or pot molding. Thereafter, a sealing material is obtained by using a removal jig.
As the reinforcing member 1 used here, a steel plate, a stainless steel plate, an aluminum plate, and other alloy plates are used, and the adhesive formed by coating can be phenolic, nitrile-based, epoxy-based, etc. In the body 2, a synthetic resin material such as a thermoplastic resin, or a synthetic rubber material such as NBR, SBR, CR, BR, or IIR is appropriately employed depending on the required performance.
[0009]
【The invention's effect】
The sealing material obtained according to the present invention is not only easy and safe for punching molding, because other unnecessary discarded portions of the reinforcing material in the molding of the outer peripheral portion to be fixed are non-adhesive parts. The degree of freedom has been increased, and the sealing performance has been dramatically improved.
Further, since the outer portion of the half-cut portion 1b can be used as a molding die in the molding die, the mold structure can be simplified and the molding process can be shortened.
Naturally, the die structure can be simplified and the molding speed can be increased even in the punching formation from the reinforcing member 1.
For this reason, a large amount of sealing material can be molded easily and inexpensively.
[Brief description of the drawings]
FIG. 1 is a plan view showing a punching process of the present invention.
FIG. 2 is a partially enlarged cross-sectional view of FIG.
FIG. 3 is a plan view showing an adhesive application process of the present invention.
4 is a partially enlarged sectional view of FIG. 3;
FIG. 5 is a cross-sectional view showing a molding process of the present invention.
6 is a cross-sectional view showing a step of removing from the state of FIG. 5;
FIG. 7 is a plan view showing a conventional punching intermediate process not using the present invention.
8 is a cross-sectional view showing a punching process in the AA ′ cross section of FIG. 7;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Reinforcement member 1a Center hole 1b Half cut part 1c Connection part 1d Outer peripheral groove 12 Ring part 13 Ring part 2 Elastic body 3 Adhesive layer 4 Punch

Claims (2)

A sealing material that is attached to the bearing portion and seals the bearing portion,
A center hole is provided in a plate-like reinforcing member made of a metal material or a synthetic resin material, and an annular half-cut portion is provided on the outer periphery of the center hole,
After the adhesive layer is formed on the annular portion formed by the center hole and the half-cut portion, it is integrated with the seal ring-shaped elastic body in the mold,
Then, the sealing material is formed by separating the half-cut portions. A manufacturing method of a sealing material that is attached to a bearing portion and seals the bearing portion,
A center hole is cut in a plate-like reinforcing member made of a metal material or a synthetic resin material, and an annular half-cut portion is formed on the outer periphery of the center hole,
After forming the adhesive layer on the annular portion formed by the center hole and the semi-cut portion, it is integrated with an elastic body shaped into a seal ring shape in the mold,
Thereafter, the semi-cut portion is separated and formed.

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