JPH0735239A - Manufacture of metal gasket - Google Patents

Abstract

PURPOSE:To facilitate disposal of a waste material, and improve yield of a seal material while securing mass-producibility of a metal gasket by in a metal gasket manufacturing method in wich plural metal gaskets having specified fluid holes are manufactured of a metal strip material. CONSTITUTION:In a first press device 4, specified fluid holes 11 are bored at respective parts for composing plural metal gaskets in a metal strip material 2. Seal material is coated at least on one surface of the strip material by a coating device 5 after this hole boring process. After this coating process, by a second press device 8, the metal gaskets 10 of a specified configuration are cut to be separated from the strip material on which a coated layer of the seal material is formed. In addition, in the second press device 8, beads may be formed to protrude in the strip material after the coating process.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a metal gasket, and more particularly to a method for manufacturing a metal gasket in which a sealing material is applied to a metal strip material and a plurality of metal gaskets having predetermined fluid holes are separated and cut. Pertain to.

[0002]

2. Description of the Related Art It is well known that a gasket is interposed between joint members in order to prevent pressure fluid from leaking from a joint surface. For example, a gasket is provided between a cylinder head and a cylinder block of an internal combustion engine. A cylinder head gasket is installed. As this kind of gasket, a metal gasket made of a metal plate material has been used recently.

As a method of manufacturing the above-mentioned metal gasket, for example, in Japanese Patent Laid-Open No. 64-40762, a seal having substantially the same shape as the shape of the material metal plate constituting the gasket is formed on at least one surface of a long metal substrate. A step of forming a film, a step of solidifying the sealing film, a step of cutting the substrate into a plurality of material metal plates, and various holes in a sealing area surrounded by the sealing film on the material metal plates. There has been proposed a method for producing a material metal plate for a metal laminated gasket, which comprises a step of forming.

In the method described in the above publication, after forming a seal film on a long metal substrate, a raw metal plate, that is, a metal gasket is separated and cut, and various holes are formed. Regarding the so-called manufacturing method, in this publication, in particular, a seal film having substantially the same shape as the shape of the material metal plate forming the gasket is formed. On the other hand, there is also known a manufacturing method in which various holes are formed in the band-shaped material, the metal gasket is separated and cut, and then the sealing material is applied to each metal gasket, which is called after-coating.

Further, regarding a mold for manufacturing a metal gasket, in Japanese Patent Laid-Open No. 3-238131, there are three processes, a hole forming process, a bead forming process, and an outer shape removing process, including a bead forming process for forming a bead on a peripheral portion of a fluid hole. A bead molding die has been proposed for sequentially performing the steps.

[0006]

However, in the above manufacturing method by precoating, when a plurality of metal gaskets are separated and cut from the band-shaped material in the final step, only the gaps between the parts constituting the plurality of metal gaskets are formed. Of course, the portion inside the hole is discarded, so that the sealing material is wasteful and the so-called yield is poor. In particular, since the waste material is coated with the sealing material, it is difficult to dispose of it. For this reason, in the above-mentioned Japanese Patent Laid-Open No. 64-40762, a seal film is locally formed in a required portion, but it is not easy to form such a seal film, and mass productivity is improved. The problem remains.

On the other hand, in the after-coating manufacturing method, since the waste material is only the metal plate, the disposal process is easy, but the sealing material is applied after being separated and cut into a plurality of metal gaskets. However, coating defects easily occur due to warpage of the metal gasket, etc., and mass production is difficult.

Therefore, in the present invention, in a method for manufacturing a metal gasket for manufacturing a plurality of metal gaskets having a predetermined fluid hole from a metal band-shaped material, it is possible to easily dispose of waste materials while ensuring mass productivity of the metal gaskets. The purpose of the invention is to improve the yield of the sealing material.

[0009]

In order to achieve the above object, the present invention provides a metal gasket manufacturing method for manufacturing a plurality of metal gaskets having predetermined fluid holes from a metal belt-shaped material. A hole for forming the predetermined fluid hole, a coating step for applying a sealing material to at least one surface of the strip-shaped material after the punching step, and a predetermined outer shape from the strip-shaped material after the coating step. The method has a cutting step of separating and cutting the metal gasket of.

Further, according to the present invention, in a method of manufacturing a metal gasket for manufacturing a plurality of metal gaskets having a predetermined fluid hole from a metal band-shaped material, a hole for forming the predetermined fluid hole in the band-shaped material is provided. Drawing step, a coating step of applying a sealing material on at least one surface of the strip-shaped material after the punching step, and a molding step of projecting a bead on the peripheral portion of the fluid hole of the strip-shaped material after the coating step And a cutting step of separating and cutting a metal gasket having a predetermined outer shape including the bead from the strip-shaped material.

In contrast to the above method of manufacturing a metal gasket,
It is desirable to add a drying step of drying the sealing material and a baking step of baking the sealing material on the band-shaped material between the coating step and the cutting step. still,
The bead forming step and the cutting step may be performed at the same time or separately.

[0012]

In the method of manufacturing a metal gasket of the present invention, a predetermined fluid hole is bored in each of the portions forming a plurality of metal gaskets in a metal strip material. After this punching process, the sealing material is applied to at least one surface of the strip-shaped material. Then, the metal gasket having a predetermined outer shape is separated and cut from the band-shaped material on which the coating layer of the sealing material is formed. Furthermore, when a molding process for forming beads on the strip-shaped material is set after the coating process, the thickness of the coating layer on the top of the bead becomes substantially uniform.

[0013]

Embodiments of the method for manufacturing a metal gasket of the present invention will be described below with reference to the drawings. As the metal gasket of the present invention, for example, a cylinder head gasket interposed between a cylinder head and a cylinder block of a multi-cylinder internal combustion engine is suitable, and in the following, a metal used as the cylinder head gasket. A method of manufacturing the gasket will be described.

FIG. 1 shows a part of an apparatus used in an embodiment of the method for producing a metal gasket of the present invention. A strip-shaped rolled metal plate, for example, a strip-shaped raw material 2 of stainless steel plate (SUS) is roll-shaped. The coil wound around is rotatably supported by the supporting device 3 around the axis of the coil, and the strip-shaped material 2 is
It is supplied to the press device 4 at a predetermined length. A feeder (not shown) for feeding the band-shaped material 2 at a predetermined length may be separately provided for the first press device 4.

The first press device 4 of the present embodiment is provided with an upper die and a lower die for the punching process, and the strip-shaped material 2 is provided with a fluid hole having a predetermined shape. That is, in the first press device 4, the band-shaped material 2 is punched, and
As shown in (1), the number of combustion chamber holes 11 (for example, four for an in-line four-cylinder internal combustion engine) corresponding to the number of cylinders is arranged side by side in the width direction of the band-shaped material 2. At the same time, although omitted in FIG. 1, a plurality of cooling water holes 12 and lubricating oil holes 13 as shown in FIG. Is drilled. It should be noted that these holes may be formed in multiple times, and in this case, the first press device 4 may be of a progressive type.

The substrate 10 having the combustion chamber holes 11 and the like formed as described above is entirely cleaned as needed, and then both surfaces of the substrate 10 are coated with a sealing material such as a fluorine rubber by the coating device 5. Then, coating layers 18 and 19 are formed on both surfaces of the substrate 10 as shown in FIG. The coating apparatus 5 of the present embodiment is a so-called roll coater, and has a pair of rollers 51 and 52, and the belt-shaped material 2 is inserted between the rollers to rotate the rollers 51 and 52.
And a sealing material (not shown) is squeezed between them and the surface of the band-shaped material 2 to have a predetermined thickness. The coating device 5 is not limited to the roll coater type, and various types such as screen printing can be adopted. Further, the coating layer may be formed only on one surface of the substrate 10, and for example, only the coating layer 19 of FIG. 3 may be formed.

Subsequently, in the drying device 6, 70 to 80
After being dried at a temperature of ℃, the baking device 7 is heated at a temperature of about 200 degrees. After passing through such a drying process and a baking process, the sealing material firmly adheres to the band-shaped material 2 and the coating layers 18 and 19 are formed as shown in the cross-sectional view of FIG. Then, the band-shaped material 2 is supplied to the second pressing device 8 and the bead forming step and the cutting step are performed.

The second pressing device 8 is a progressive type pressing device, and includes an upper die and a lower die (not shown) for the bead forming process and an upper die and a lower die (not shown) for the cutting process. They are installed side by side and fixed to the common upper and lower mold stands. In the bead forming step, as shown in FIGS. 2 and 3, a bead 15 is formed around each combustion chamber hole 11, and a bead 16 around the cooling water hole 12, the lubricating oil hole 13 and the bolt hole 14, and a metal. The bead 17 is formed over the entire circumference of the portion forming the gasket. These beads 16,1
Since 7 has only one bent portion, it is called a half bead with respect to the bead 15. And in the cutting process,
The planar substrate 10 shown in FIG. 2 is separated and cut along the outer shape, and is sequentially conveyed by the conveyor 9 as shown in FIG.

According to the manufacturing method of the above embodiment,
Since the coating layers 18 and 19 of the sealing material are formed after the combustion chamber hole 11 and the like are formed in the metal strip material 2, the sealing material does not adhere to the waste material in the hole portion, and therefore it is easy. The sealing material in the hole portion is not wasted unlike the conventional method. Since the coating of the sealing material is performed on the strip-shaped material 2 after the punching process, mass productivity can be ensured. Moreover, bead 1
According to the conventional method in which the sealing material is applied after forming 5, etc., the coating layer on the top of the bead 15, etc. becomes thin, whereas
According to this embodiment, since the beads 15 and the like are formed after the coating layers 18 and 19 are formed, it is possible to form a coating layer having a substantially uniform thickness including the beads 15 and the like.

In this embodiment, the continuous strip-shaped material 2 is interposed between the first pressing device 4 and the coating device 5, but the first punching device 4 performs the punching process. After being performed, the coil may be once rewound at the position of the line RR in FIG. 1, and the strip-shaped material 2 may be supplied to the coating device 5 from this coil. Further, the bead forming step and the cutting step are performed in sequence in the second press device 8, but the two steps may be performed simultaneously. Further, other steps such as setting a flat pressing step between the bead forming step and the cutting step may be added. A plurality of holes are formed in the band-shaped material 2 after the above-mentioned painting process, but the cooling water holes 12 having a small diameter are also included in these holes, and there is a risk of clogging by the sealing material.
Therefore, the pins may be inserted into the holes at the same time as the molding step so that the holes can be surely penetrated.

In the metal gasket manufactured as described above, a fastening bolt (not shown) is inserted into the bolt hole 14 and, for example, the bead 15 is arranged so that the protruding side thereof is the cylinder block (not shown) side. , Between the cylinder head (not shown) and the cylinder block. That is,
When a tightening force is applied to the substrate 10, the bead 15 is deformed,
The substrate 10 comes into close contact with the cylinder block by the elastic restoring force of the beads 15, and a predetermined surface pressure is secured around each combustion chamber hole 11.

[0022]

Since the present invention is constructed as described above, it has the following effects. That is, according to the method for producing a metal gasket of the present invention, a metal strip-shaped material is sealed on at least one surface of the strip-shaped material after a predetermined fluid hole is formed in each of the parts constituting the plurality of metal gaskets. Since the material is applied and then separated and cut into a metal gasket having a predetermined outer shape, the waste material generated at the time of manufacturing the metal gasket can be easily disposed of. Moreover, the yield of the sealing material can be improved while ensuring mass productivity.

Further, in the method of setting the bead molding step after the coating step, a coating layer having a substantially uniform thickness can be formed over the entire surface including the top of the bead.
It is possible to manufacture a metal gasket having a good sealing property.

[Brief description of drawings]

FIG. 1 is a perspective view showing a main part of a manufacturing process in an embodiment of a method for manufacturing a metal gasket of the present invention.

FIG. 2 is a plan view of a part of the metal gasket manufactured by the manufacturing method according to the embodiment of the present invention.

3 is a partial cross-sectional view of a metal gasket manufactured by a manufacturing method according to an embodiment of the present invention, which is a cross-sectional view taken along the line AA of FIG.

[Explanation of symbols]

 2 band-shaped material 3 support device 4 first pressing device 5 coating device 6 drying device 7 baking device 8 second pressing device 9 conveyor 10 substrate 11 combustion chamber hole (fluid hole) 15 bead 16 and 17 bead

Claims (2)

[Claims] 1. A method of manufacturing a metal gasket for manufacturing a plurality of metal gaskets having predetermined fluid holes from a metal strip-shaped material, comprising a punching step of forming the predetermined fluid holes in the strip-shaped material. After the punching step, a coating step of applying a sealing material to at least one surface of the strip-shaped material, and a cutting step of separating and cutting a metal gasket having a predetermined outer shape from the strip-shaped material after the coating step are performed. Manufacturing method of metal gasket. 2. A method of manufacturing a metal gasket for manufacturing a plurality of metal gaskets having predetermined fluid holes from a metal strip material, the punching step of forming the predetermined fluid holes in the strip material, A coating step of applying a sealing material on at least one surface of the strip-shaped material after the punching step, a molding step of projecting a bead at least at the peripheral edge of the fluid hole of the strip-shaped material after the coating step, and the bead A method of manufacturing a metal gasket, comprising a cutting step of separating and cutting a metal gasket having a predetermined outer shape including: