JPH02282424A - Production of metal gasket - Google Patents

Abstract

PURPOSE:To produce a metal gasket having superior performance and formativeness by successively subjecting a substrate of martensitic stainless steel blended with Si, Cu or Ti to coating with an elastic layer, working into a prescribed shape and specified subzero treatment. CONSTITUTION:One side or both sides of a metal substrate of martensitic stainless steel blended with Si, Cu or Ti as a precipitation hardening element are coated with an elastic layer composed of a matrix of synthetic rubber, synthetic resin, etc., and additives such as a filler, a curing agent and an age resistor. The coated metal substrate is blanked into a desired shape and the opening is subjected to bead working. The substrate is then subjected to subzero treatment by aging at -10 to -80 deg.C for 1-10 min to increase the Vickers hardness Hv to 200-600. A metal gasket having high hardness, a high spring constant, high corrosion resistance, satisfactory airtightness, thermal deformation resistance, a high degree of freedom of bead shape, satisfactory elastic layer retentivity and superior sealing performance is obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for manufacturing a gas get, and more specifically to a method for manufacturing a molded metal gasket comprising an elastic layer and a metal plate.

[Prior Art] A gas get attached between two members is tightened with a bolt or the like to seal the two members. For this reason, the gasket is stress-relieving.

Materials with low creep and good compatibility with the sealing member are used, and such gaskets are mainly made of a metal plate with an elastic body attached.

[Problem to be solved by the invention] When manufacturing such gaskets, fluid.

It is necessary to form one or more beads on the outer periphery of the opening through which gas passes, so that the spring constant of the metal substrate provides airtightness and follows the thermal deformation of the flange.

Therefore, the metal substrate serving as the base material is not only required to have anti-corrosion performance against the fluid/gas to be sealed, but also must have hardness to obtain the desired spring constant. However, since the gas get has an elastic layer on its surface, there is a major limitation in that hard bead processing cannot be performed, and there remains a problem in long-term durability.

To show a general conventional example, the elastic layer on the surface is 50μ to 20μ
When bead processing is applied to a metal substrate coated with 0 μ and formed, it is preferable that the hardness is HV200 or less to prevent destruction of the elastic layer, but a gasket formed with this hardness cannot be tightened with an axial force of 3 TON to 4 TON. If a flange is used for a long period of time, the initial bead will become flattened and the airtightness will be poor. Therefore, if the HV height of the metal substrate is increased, beads of the desired shape cannot be obtained due to the elasticity of the surface layer, and high temperature treatment cannot be performed in view of the heat resistance of the surface elastic layer.

The present invention has been made to eliminate these many drawbacks, and is a method for manufacturing a metal gasket that is excellent in terms of performance and shape.

[Means for Solving the Problems] The present invention provides a filling material using synthetic rubber or synthetic resin as a rubber matrix on one or both sides of a thin metal plate having a thickness of, for example, about 0.15 t to 1.0 t.

A method for manufacturing a metal gasket by coating an elastic layer containing a hardening agent, an anti-aging agent, etc.
A metal substrate is prepared by blending u and Ti, and after the elastic layer is applied to the metal substrate, it is punched into a desired shape and the opening is bead-processed, followed by subzero treatment at a temperature of -10°C.
Aging treatment at ℃ to 80℃ for 1 minute to 100 minutes to reduce hardness to HV2
It is characterized by being formed in the range of HV600 to HV600.

[Function] The present invention is a method for manufacturing a metal gasket having the above-mentioned structure, in which precipitation hardening martensitic stainless steel is used as a substrate, and after applying an elastic layer to an appropriate thickness on the surface of the substrate,
By performing bead processing, punching, etc., and applying sub-zero treatment to harden it, the deterioration of the elastic layer on the surface.
The metal substrate of the core material can be formed to a desired hardness without destruction.

[Example] Sub-zero treatment was carried out at -25°C and -75°C, and the changes in HV with respect to normal conditions are shown in Table 1.

[Effects of the Invention] According to the present invention, a metal gasket in which a metal substrate has high hardness has an excellent function of increasing the spring constant and anti-corrosion performance, improving airtightness, and being able to follow thermal deformation.

In addition, the above structure dramatically improves the degree of freedom in shaping the bead shape and maintains a uniform thickness of the elastic layer, resulting in extremely high sealing performance.

Table 1 175'C

[Brief explanation of drawings]

Table 1 is a graph diagram showing an example of the present invention. Status (TIME) 50 minutes

Claims (1)

[Claims] In a method for manufacturing a metal gasket in which one or both sides of a thin metal plate is coated with an elastic layer containing a synthetic rubber or synthetic resin as a matrix and a filler, a hardening agent, an anti-aging agent, etc. ; A metal substrate is prepared by blending Si, Cu, and Ti as precipitation hardening elements into martensitic stainless steel, and after applying the elastic layer to the metal substrate, it is punched into a desired shape, and the openings are bead-processed. and then sub-zero treatment at a temperature of -10°C to -80°C.
A method for manufacturing a metal gasket, characterized in that the metal gasket is aged at a temperature of 1 to 100 minutes to have a hardness in the range of HV200 to HV600.