JPH01203644A - Manufacture of metal gasket - Google Patents

Abstract

PURPOSE:To obtain a metal gasket with a uniform thickness by forming a folded portion by laminating a base plate on which a bead is formed after applying a coat of microseal material and a sub-plate coated with the microseal material. CONSTITUTION:Both surfaces of an elastic metal plate 2 are coated with a microseal material M. A bead is formed on a specified portion of the metal plate to obtain a base plate 6. One surface of a metal plate 8 is coated with the microseal material M to obtain a sub-plate 10. Next, a folded portion 12 is formed, and a laminated type of metal gasket 14 is completed by laminating the base-plate 6 and the sub-plate 10. Since the microseal material does not intrude into the clearance of the laminated portion and the folded portion and does not stagnate there, a metal gasket of uniform thickness can be obtained, and a good sealing effect can be obtained without dissolving or outflowing the microseal material after bolt-tightening.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to metal gaskets. A metal gasket is used for sealing between joint members, for example between the cylinder head and cylinder block of an internal combustion engine, by providing a bead on an elastic metal plate and exerting a sealing effect by the amount of elastic recovery and restoring force caused by the elastic deformation. be.

[Conventional technology]

This metal gasket is often constructed by laminating a plurality of metal plates. Then, in order to form a predetermined thickness at a predetermined location of this gasket, the sub-plate is folded back.

[Problem that the invention seeks to solve]

Conventionally, after the layering and folding process, a micro-seal painting process was performed to compensate for irregular surfaces such as tool marks on the metal plate and the mating surface, so the paint could seep in between the eyebrows of the folded part and harden. This results in a metal gasket with partially uneven thickness that exceeds the specified thickness as designed, and as a result, the thickness decreases over time to less than the thickness when bolted. However, there was an inconvenience that the airtightness was significantly reduced.

[Purpose of the invention]

The key point of the present invention is that the order of the manufacturing steps is changed from the conventional, common sense order, and the disadvantages caused by such process changes are eliminated by special means.

〔Example〕

That is, as shown in FIG. 1, the micro sealing material M is applied to both sides of the elastic metal plate 2. Next, as shown in FIG. 2, beads 4 are formed at predetermined locations to obtain a substrate 6. Further, as shown in FIG. 3, a micro-sealing material M is applied to one side (or both sides may be used, if necessary) of the metal plate 8 to obtain a sub-plate 10.
Next, as shown in FIG. 4, a folded portion 12 is formed. Here, the substrate 6 of FIG. 2 and the sub-plate 10 of FIG. 4 are laminated to complete the laminated metal gasket 14 of FIG. 5.

In metal gaskets manufactured in this way, the micro sealing material does not penetrate into the gaps between the laminated parts and folded parts and stay there, so there is no tendency for the micro sealing material to melt and flow out after fastening, and it does not interfere with the retention of surface pressure on the bead. Achieve a sealing effect.

Note that FIGS. 6 to 8 show other configurations of metal gaskets manufactured in the same manner as in the above-mentioned embodiments.

Note that examples of the micro-sealing material include paints that have heat resistance and flexibility and can exhibit a micro-sealing effect.

Further, the surface to which the micro sealing material is applied may be either both sides or one side of the metal plate (in short, it is sufficient that it is applied to compensate for irregularities such as tool marks, etc.).

[Brief explanation of the drawing]

Figure 1 is a partial cross-sectional view showing a micro-sealing material coated on an unprocessed elastic metal plate that is to become a substrate; Figure 2 is a partial cross-sectional view of the substrate shown in Figure 1 with bead processing; 3
The figure is a partial cross-sectional view showing a state in which a micro-sealing material is applied to a metal plate that is to become a secondary plate, Figure 4 is a partial cross-sectional view of the metal plate in Figure 3 after being bent, and Figure 5 is Fig. 2 and Fig. 4 are laminated to form a laminated metal gasket. Figures 6 to 8 are cross-sectional views of main parts of other types of laminated metal gaskets. Figure, No. 9
The figure is a plan view showing the main parts of the metal gasket.

Claims (1)

[Scope of Claims] 1. Applying micro-seal coating to at least the outer surface of the elastic metal plate. Forming a bead surrounding the combustion chamber hole on this to serve as a substrate, and applying micro-seal coating to at least the outer surface of the metal plate to serve as a substrate. A method of manufacturing a metal gasket by laminating the sub-plate on one side of the substrate, which is used as a plate, and folding and overlapping the combustion chamber hole side edge of the sub-plate to the other side of the substrate to form a folded portion.