JPS583732A - Manufacture of seal washer - Google Patents

Abstract

PURPOSE:To easily manufacture a seal washer which is satisfactory in workability for screwing a bolt, etc., and excellent in sealing effect, by sticking a metallic plate and an elastic thin plate for sealing, piercing a through-hole of the bolt, etc., and after that, punching said plate to a circular body having a necessary outside diameter. CONSTITUTION:An original material B obtained by sticking an elastic thicn plate 2 for sealing, which consists of natural rubber,synthetic rubber, etc. and is 1-3mm. in thickness, onto the upper surface of a metallic plate 1 which consists of iron, aluminum, stainless steel, etc. and is about 0.5-3mm. in thickness, by use of an adhesive agent of a hog melt type, etc. is fed between a punch 3 and a female die 4 so that the elastic thin plate 2 for sealing is opposed to the punch 3, a through-hole of a bolt, etc., whose inside diameter is phi1 is pierced, and also a shape of a desired counter sunk mold, etc. is formed. The rubber plate 2 is compressed to the outside by the punch 3, and when the punch 3 is drawn, an inside hole whose inside diameter phi3 is smaller than phi1. In the following press step, said metallic plate is blanked to a circular body having an outside diameter phi2 by use of a punch 7 and a female die 8, by which a seal washer is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a method for manufacturing a seal washer.

Conventionally, seal washers have generally had a metal part and a comb part manufactured separately, and have been used by sequentially inserting the two into a nail, bolt, or the like.

However, the seal washer as described above has the disadvantage that it takes time to insert and install, reducing work efficiency, and it is easy to forget to insert the rubber seal.

To solve these problems, there are methods that integrate the separately formed rubber part and metal part by gluing them together, or a structure in which the metal part is formed into a bowl shape and the rubber part is fitted inside. Seal washers have recently been developed and used.

However, the former method has the disadvantage that it takes time and effort to bond the metal part and the rubber part, making it difficult to significantly reduce manufacturing costs. Furthermore, even if the adhesion process is successfully automated, equipment costs will rise significantly, which will cause an increase in costs.

Furthermore, even in the latter case, the shape of the metal part must be complicated in order to securely fit and fix the rubber part.
Moreover, fitting the rubber portion requires time and effort, making it difficult to reduce manufacturing costs.

On the other hand, if the seal washer can be firmly fixed near the nail head, screw head, etc. when used by pre-fitting the seal washer into a nail, wood screw, bolt, etc.
Driving nails and tightening wood screws become extremely easy. In particular, for so-called screw bolts, etc., where the bolt head is inserted into a drill chuck or the like and screwed in while rotating at high speed, it is important to be able to fix the seal washer near the bolt head. This is an essential work requirement to prevent the rubber part from coming into contact with other members and being worn out. In order to do this, the best way is to make the inner diameter of the hole in the rubber part smaller than the inner diameter of the hole in the metal part (the hole for inserting a bolt, etc.), and to fix the hole end of the rubber part to the outer circumferential surface of the bolt, etc. be.

The present invention solves all the manufacturing cost problems in the manufacturing of conventional seal washers as described above, and also allows the inner diameter of the hole in the elastic sealing member to be adjusted in the metal part by extremely simple press working. The object of the present invention is to provide a method for manufacturing a sealing washer that can be made smaller than the inner diameter of the hole.

The basic structure of the present invention is that a thin elastic sealing plate having elasticity is attached to one side of a metal plate, and a hole for inserting a bolt or the like having an inner diameter of 1 is bored in this in the pre-process of a press machine. Next, in the post-process of the press machine, by punching out the circular body of the outer diameter door 2, the diameter yJ3 of the inner hole of the thin sealing plate is automatically made smaller than the diameter of the inner diameter door 1 of the insertion hole for bolts, etc. It is intended to be used in various ways.

Hereinafter, the details will be explained based on an embodiment of the present invention shown in FIGS. 1 to 6. FIG. 1 shows the manufacturing process of the seal washer according to the present invention. In the pasting process A, a metal plate 1 (iron, aluminum, stainless steel, etc.) with a thickness of about 0.5 to 3 ff is coated with Thickness l +u~3 yt
An elastic thin plate 2 for sealing having an elasticity of approximately x is adhered and fixed with a suitable adhesive E. Note that as the sealing elastic thin plate 2, a natural rubber, synthetic rubber plate, synthetic resin plate, etc. is used, and as the adhesive E, a hot melt type, comb type, or emulsion type adhesive is used. Ru.

Further, the shapes of the metal plate 1 and the elastic thin plate 2 for sealing can be arbitrarily selected, and are cut into a convenient shape to provide a feeding power to the next pressing process.

The raw material B formed in the pasting step A is sent to a pre-process C of a press machine in the form of a coil or a flat plate.

In the pre-process C, as shown in FIG. 2, a through hole 5 for a bolt or the like having an inner diameter of 5211 is bored in the metal plate 1 using a punch 3 and a female die 4. Note that the raw material B to be inserted between the punch 3 and the female die 4 is fed so as to face the punch 3 through the sealing elastic thin plate 2, and from this point on, the sealing elastic thin plate 2, which will be described later, is fed. The diameter reduction effect is further improved. Further, the shape of the female mold 4 is arbitrary, and in this embodiment, in order to make a seal washer curved into a dish shape, the female mold 4 has a concave curved shape.
(In the case of a flat seal washer, the upper surface of the female mold 4 may be made flat.

When the press machine is operated and the punch 3 is pushed in, the metal plate 1 is bent as shown in FIG. An insertion hole 5 having an inner diameter y31 equal to ρl is punched out. Third
The figure is an enlarged sectional view showing the state in which the punch 3 has bitten into the elastic thin plate 2 (rubber plate) for i-sealing, and the comb plate 2 is locally compressed in the direction of the arrow due to the penetration of the punch 3. Then, the inner hole 6 will be bored. In addition, when the amount of compression of the comb plate 2 in the direction of the arrow is large (1), local peeling of the adhesive E may occur near the outer periphery of the punch 3, but as will be described later, in practical use There is no problem at all. When the punch 3 is pushed all the way to the end and an insertion hole 5 with an inner diameter of ρ1 is made in the metal plate 1, when it is pulled up, it is compressed outward as shown in Fig. 4. The rubber plate 2 is restored by its elasticity, and the inner hole 6 of the comb plate 2 becomes smaller in diameter than the outer diameter of the punch 3.

That is, due to the diameter reduction effect due to the elasticity of the rubber plate 2, the inner hole 6
The inner diameter g13s of the insertion hole 5 becomes slightly smaller than the inner diameter g131 of the insertion hole 5. The amount of diameter reduction is δ−−←υ22m, which is usually about 80% of the thickness of the elastic thin plate 2 for sealing, and when a rubber plate with a thickness of 2fi is used, it is about δ−1.6ff. ).

Once the holes 5 for inserting bolts and the like are completed, the raw material B is sent to the subsequent stage of the press machine. In the post-processing step, the raw material B is punched into a circular body having appropriate external dimensions using the punch 7 and the female die 8, and is then shaped. In the actual operation of the press machine, the punches 3 and 7 are operated simultaneously by the drive of the upper die (0), and the raw material B is sequentially fed through the roller 9, so that seal washers are continuously formed. It will be done.

5 and 6 are a plan view and a sectional view of a seal washer formed by the manufacturing method, and the outer diameter is 8 to 50.
It is possible to manufacture a seal washer with an inner diameter 5213 of the insertion hole 5 of about 3 to 20 ff.

Next, the effects of the present invention will be explained.

In the present invention, as described above, a thin elastic plate 2 for sealing is adhered to a large pre-crimped metal plate 1 to form a raw material B, and this is continuously punched out using a press machine to form a seal washer. The configuration is such that it forms. Therefore, compared to the previous method of integrating the metal part and rubber part, which were formed separately, by pasting, it is possible to significantly reduce the manufacturing cost, and the manufacturing cost is approximately 1/3 to 1/3 of the previous method. Reduce to about 1/4.

Furthermore, by utilizing the diameter reduction effect caused by the elastic force of the sealing elastic thin plate 2, the inner diameter a of the insertion hole 5 is automatically adjusted to the inner diameter of the inner diameter door 3 of the inner hole 6 of the sealing elastic thin plate 2. It can be made smaller, which is extremely convenient.

Furthermore, as described above, even if local adhesion failure occurs due to compressive strain on the outer periphery of the inner hole 6, the sealing elastic thin plate 2
does not peel off from the metal plate 1 at all, and therefore does not cause any problems in practical use.

Furthermore, if the seal washer according to the present invention is used, it will be extremely easy to insert it into wood screws, bolts, etc.
In addition, since the bolt can be firmly fixed and held near the head of the bolt, it is easy to screw in the bolt, and there is no possibility that the washer will come into contact with other members and be damaged during screwing. Furthermore, even after the screwing of the bolt, etc. is completed, the end surface of the inner hole of the sealing elastic thin plate 2 comes into close contact with the outer peripheral surface of the bolt, etc., completely blocking the intrusion of rainwater, etc., and improving the sealing effect. is significantly improved.

As mentioned above, the present invention has excellent practical utility.

[Brief explanation of drawings]

FIG. 1 is a manufacturing process diagram of a seal washer according to the present invention. FIG. 2 is a schematic cross-sectional view of the press. FIGS. 3 and 4 show: an inner hole 6 formed in the thin elastic plate 2 for sealing;
It is an explanatory view showing diameter reduction of. FIG. 5 is a plan view of a sealing washer manufactured according to the present invention, and FIG. 6 is a cross-sectional view of FIG. A Pasting process C Pre-process of press machine D Post-process of press machine B Raw material 1 Metal plate 2 Elastic thin plate for sealing 3, 7 Punch 4.8 Female mold 5 Through hole for bolt etc. 6 Elastic thin plate for sealing Inner hole patent applicant Motohiro Suzuki Representative of Masuoka Shoji Co., Ltd.

Claims (2)

[Claims] (1) A thin elastic sealing plate (2) having elasticity is pasted on one side of the metal plate (1) to constitute the raw material (B), and the inner diameter yl is After drilling holes (5) for inserting bolts, etc. into the raw material (B), the raw material (B) is punched into a circular body with an outer diameter of ρ2 in the post-process (D) of a press machine. , the inner hole (
6) A method for manufacturing a seal washer, characterized in that the diameter door 3 is finished to be smaller than the inner diameter al of the insertion hole (5) for a bolt or the like. (2) The thin elastic plate for sealing (2) is a rubber plate, and the thin elastic plate for sealing (2) is pressed while facing the punch side of a press machine. Seal washer manufacturing method.