JPH06174098A - Metal gasket coating method - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] It is possible to avoid damage to the sealing material during punching and forming, and use only the required amount of sealing material and punch out the punched sheet metal piece. It is an object of the present invention to provide a method for coating a metal gasket that can be directly dissolved and reused. A metal gasket member 3 having a predetermined shape is formed by punching an uncoated thin metal plate material, and a coating is attached to the punched metal gasket member. The coating to be applied is about 15 to 4 using an electrodeposition paint made of an epoxy-based, urethane-based or fluorine-based synthetic resin or a material similar to them.
It is deposited by electrocoating to give a 0 μm thick coating.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for coating a single or laminated metal gasket, and more particularly to a method for coating a surface of a metal gasket member constituting a metal gasket with a sealing material.

[0002]

2. Description of the Related Art A metal gasket using a metal gasket member having a surface coated with a sealing material such as NBR is used for a cylinder head gasket and the like. Such a metal gasket is produced by stamping and molding a thin metal plate material having a surface coated with a sealing material.

For this reason, the sealing effect is liable to be impaired due to the fact that the surface of the coating film of the sealing material is damaged or is easily distorted and peeled off at the time of stamping and molding. there were. Also,
Punched parts such as openings for fluid flow and openings for tightening bolts and the remaining parts around them become scraps of the sheet metal material having the sealing material adhered to the surface thereof. This metal thin plate material piece needs to be reused after the sealing material is peeled off, which is not profitable. For this reason, there are many cases in which they are treated as industrial waste as they are, but securing a disposal site, increasing disposal costs, etc. has also become a heavy burden on companies.

[0004]

DISCLOSURE OF THE INVENTION The present invention is capable of avoiding damage to the coating film of the sealing material during the stamping forming process, and moreover, the sealing material is used only in the required amount and punched out. It is an object of the present invention to provide a method for coating a metal gasket, which allows the scraps of the same to be directly melted and reused.

[0005]

In the method for coating a metal gasket according to the present invention, first, a metal thin plate material which is not coated with a sealing material is stamped and formed to form a metal gasket member having a predetermined shape. Then, a coating of sealing material is applied to the stamped metal gasket member.

The coating is about 1 using an electrodeposition paint composed of an epoxy-based, urethane-based or fluorine-based synthetic resin, a carbon material, or a sealing material similar to these, which can be electrodeposited.
It is preferably applied by electrodeposition coating so as to form a film having a thickness of 5 to 40 μm.

[0007]

The punching process for forming the metal gasket member having a predetermined shape is carried out at a stage where the thin metal sheet material is not coated, and the coating is prevented from being damaged during the punching process. The coating is uniformly and relatively thickly attached to the surface of the metal gasket member by electrodeposition coating a metal gasket member stamped and formed into a predetermined shape. Internal stress does not remain in the applied film,
The peeling of the coating due to vibration does not occur.

[0008]

EXAMPLE As shown in FIG. 1, a method for coating a metal gasket according to an embodiment of the present invention comprises punching a metal sheet material 1 usually wound in a coil with a press 2 and at the same time, if necessary, a bead. The predetermined metal gasket member 3 is formed by performing a required bending process such as the formation of. At this time, scrap 1a of the metal thin plate material 1 is generated, but it should be noted that this scrap 1a is only the metal thin plate material.

As shown in FIG. 2, the stamped metal gasket member 3 is subjected to degreasing, washing, chemical conversion treatment and washing in the same manner as in the well-known electrodeposition coating.
After undergoing necessary pretreatment 4 such as degreasing and roughening, it is dipped in an electrodeposition tank 5 containing an electrodeposition coating material composed of a sealing material to undergo electrodeposition coating, and a relatively thick film is formed on the surface. It is formed uniformly.

A metal gasket member 3 to which a film is attached
In the same manner as in the well-known electrodeposition coating, the cleaning device 6
After being washed with water and dried by the drying device 7, it is sent to the next step 8. When making a single metal gasket,
The metal gasket member provided with this coating is used as a product as a whole as a whole. However, it will be easily understood by those skilled in the art that when a laminated metal gasket is produced, the metal gasket is appropriately combined with other metal gasket members or the like to form a required metal gasket.

The sealing material to be electrodeposited may be any material as long as it has a sealing property which is the original purpose of the gasket. For example, this coated metal gasket member is used as a cylinder head of an internal combustion engine. When applied to a gasket, an epoxy-based, urethane-based or fluorine-based synthetic resin, a carbon material, or a sealing material similar to them is used.

The thickness of the coating should be appropriately changed depending on various conditions such as elasticity of the coating to be applied, internal pressure of fluid, and tightening force. In particular, this coated metal gasket member is used. When applied to cylinder head gaskets of internal combustion engines, it is preferred to coat to a thickness of about 15-40 .mu.m.

On the other hand, the electrodeposition coating conditions such as the composition and current density of the electrodeposition tank are not the object of the present invention, and it is sufficient to apply the conventional electrodeposition coating conditions.
I will omit the explanation of these.

Further, the electrodeposition coating can also be formed in a plurality of layers such as attaching a base coating in order to secure the adhesiveness of the coating and maintain elasticity.

[0015]

According to the present invention, after the metal thin plate material is stamped and formed into a metal gasket member having a predetermined shape,
Since the surface of the metal gasket member is coated, the coating can be prevented from being damaged. In addition, the metal sheet material scraps that are produced when punching out fluid flow openings are only metal sheet materials, and can be reused as they are, thus securing a barren place for processing industrial waste and increasing costs. It is possible to eliminate the need for the above.

In addition, by forming a coating film on the surface of the metal gasket member by electrodeposition coating, a uniform and relatively thick coating film can be attached to the surface of the metal gasket member. Since the internal stress does not remain, it is possible to prevent the coating film from peeling off from the metal gasket member due to vibration or the like.

Furthermore, since a film is formed on the surface of the metal gasket member by electrodeposition coating, work efficiency can be improved, and a necessary amount of the film-forming material may be adhered to the metal gasket member before use. It is possible to reduce material waste,
Therefore, the product cost can be reduced.

[Brief description of drawings]

FIG. 1 is a schematic diagram for explaining a step of punching forming processing in an example of the present invention.

FIG. 2 is a schematic diagram for explaining a process of electrodeposition coating in an example of the present invention.

[Explanation of symbols]

 1 Metal thin plate material 2 Press machine 3 Metal gasket member 4 Pretreatment 5 Electroplating tank 6 Cleaning device 7 Drying device 8 Next process

Claims (2)

[Claims] 1. A metal gasket member having a predetermined shape is formed by stamping and forming a metal thin plate material not coated with the seal material, and a coating film of the seal material is attached to the punched metal gasket member. Method for coating metal gasket material. 2. The coating is made of an electrodeposition coating material composed of an epoxy-based, urethane-based or fluorine-based synthetic resin, a carbon material or a sealing material capable of electrodeposition similar to these,
The method of coating a metal gasket material according to claim 1, wherein the coating is carried out by electrodeposition coating so as to form a coating having a thickness of about 15 to 40 µm.