JP2526266B2 - Molding method of metal gasket bead forming mold and its mold - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a bead forming mold for a metal gasket and a mold therefor, and particularly to two metal substrates each having slits having different drilling portions. The present invention relates to a method for forming a bead forming die for a metal gasket, which is formed by punching and forming a die with two metal substrates to improve the work efficiency of the die forming work, and the die.

[Conventional technology]

There is known a metal gasket that presses a bead formed on an elastic metal plate against a joint surface by a bolt fastening force to form a seal line and elastically seal the joint surface. This metal gasket is composed of a pair of molds consisting of a male mold and a female mold.
A bead is press-formed on an elastic metal plate. That is, one metal substrate to be paired has a male part by projecting a projecting portion, and the other metal substrate is provided with a groove-shaped recess corresponding to the projecting portion to form a female type. . A bead is formed by sandwiching an elastic metal plate between the male mold and the female mold and maintaining a strong pressure. The applicant of the present application has already filed a method for forming this bead forming die and the die forming method (Japanese Patent Application No. 59-173197).

[Problems to be solved by the invention]

By the way, in the conventional method for forming a bead forming die for a metal gasket and the die, a male die and a female die are separately provided with slits of substantially the same shape, and a metal strip plate is provided in the male die slit. Was buried to form a protrusion.

However, the protrusion of the male die and the slit of the female die must be made to coincide and face each other with high accuracy, the die molding operation is difficult, and a lot of labor and time are required to mold the die. At the same time, there is an inconvenience that the mold becomes extremely expensive.

[Object of the Invention]

Therefore, in order to eliminate the above-described inconvenience, an object of the present invention is to form a slit that is substantially orthogonal to a substrate surface and surrounds a sealing portion of one metal substrate and divides one metal substrate into two. One slit that is provided to surround the sealed portion of the other metal substrate and is substantially orthogonal to the substrate surface at a portion different from the slit formation portion of the one metal substrate and divides the other metal substrate into two. And one half of the one metal substrate is projected downward to form an upper mold, and the other half of the other metal substrate and the other half of the one metal substrate which do not face each other are formed. By projecting upward to form the lower mold, and forming the mold by these upper and lower molds, a great amount of labor and time is not required for molding the mold, and the work efficiency of the mold molding work can be improved. Of a practically advantageous metal gasket In implementing the molding method and the mold of the over-de formation mold.

[Means for solving problems]

In order to achieve this object, the present invention provides a slit that is substantially orthogonal to the substrate surface and surrounds the sealed portion of the one metal substrate and that divides the one metal substrate into two slits. A slit that is substantially orthogonal to the substrate surface and that divides the other metal substrate into two is formed in a portion that surrounds the sealing portion of the other metal substrate and that is different from the slit formation portion of the one metal substrate. One of the two metal substrates is divided into two and one of the two metal substrates is divided into two parts. The other metal substrate is divided into two parts and does not face the one part of the one metal substrate. Is protruded upward to form a lower mold, and the step beads are formed by these upper and lower molds. In addition, a slit that is substantially orthogonal to the substrate surface and that divides the one metal substrate into two is formed in a portion surrounding the seal portion of the one metal substrate to surround the seal portion of the other metal substrate. One slit that is substantially orthogonal to the substrate surface and divides the other metal substrate into two is formed at a portion different from the slit formation portion of the one metal substrate. One of the two divided parts is formed into a required bead shape surrounding the sealing portion by projecting a predetermined height downward from the substrate surface to provide a first step portion to serve as an upper mold. One of the two parts of the metal substrate, which does not face the other, is formed into a required bead shape that surrounds the sealing portion by projecting a predetermined height upward from the surface of the substrate to form a second step part to form a lower mold. Shape step beads Characterized in that to constitute a mold so as to.

[Action]

According to the above-described invention, one slit that is substantially orthogonal to the substrate surface and that divides one metal substrate into two is formed in a portion surrounding the seal portion of one metal substrate, and the seal portion of another metal substrate is formed. A slit that is substantially orthogonal to the substrate surface and divides the other metal substrate into two in a region surrounding the first metal substrate and in a region different from the slit-formed region of the first metal substrate. One of the two divided metal parts is projected downward to form an upper mold, and the other metal substrate is divided into two and one metal substrate is divided into two and the other metal mold is protruded upward to project the lower mold. The mold is easily formed by these upper and lower molds to improve the work efficiency of the mold forming work.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

1 to 5 show an embodiment of the present invention. In FIG. 1, 2 is a mold for forming a step bead of a metal gasket 36 described later. The mold 2 is composed of two first and second metal substrates 4 and 6.

More specifically, first, the two first and second metal substrates 4 and 6 will be referred to as a first metal substrate 4 and a second metal substrate 6 from above, and the first metal substrate 4, which is one metal substrate, will be sealed first. A first slit 8 that is substantially orthogonal to the substrate surface 4F is formed by a cutting device such as a wire cutter (not shown) at a location, for example, at a location surrounding the combustion chamber hole 42 of the metal gasket 36 described later. , The first metal substrate 4 to the first metal substrate 4-
Divide into 1 and 4-2. At this time, the slit width of the first slit 8 formed by a cutting device such as a wire cutter (not shown) is set to D, which is equal to the cutting width of the cutting device. Further, a sealing portion of the second metal substrate 6 which is another metal substrate, for example, a portion surrounding the combustion chamber hole 42 of the metal gasket 36 which will be described later and a portion different from the first slit 8 drilling portion of the first metal substrate 4. , For example, one second slit 10 which is substantially orthogonal to the substrate surface 6F is formed at a portion spaced apart from the first slit 8 formed portion of the first metal substrate 4 in the outer direction by a distance B, and The two metal substrates 6 are also the second metal substrates 6-1 and 6-2.
Into two parts.

One of the first metal substrates 4, for example, the first metal substrate 4-
2 into the required bead shape that surrounds the sealing area
It is provided so as to project downward by a predetermined height H. That is, as shown in FIG. 1, the first metal substrate 4-2 and the upper pedestal
First spacer 14 having a predetermined thickness (same as the predetermined height H) between 12
And the first metal substrate 4-on the upper pedestal 12
1 is fixed, and the first metal substrates 4-1 and 4-2 are fixed to the upper pedestal 12 by the first fixing members 16 such as bolts. At this time, the first metal substrate 4-2 is fixed at a predetermined position by the positioning first knock pin 18, and the first metal substrate 4-2 is fixed.
Is protruded downward from the substrate surface 4F by a predetermined height H to form a first step portion 20 to form an upper mold 22.

In addition, the other side of the second metal substrate 6, for example, the second metal substrate 6-1 that does not face the first metal substrate 4-2, is formed in a predetermined bead shape surrounding the sealing portion and has a predetermined height above the substrate surface 6F. It is provided so that only H is projected. That is, as shown in FIG. 1, the second spacer 26 having a predetermined thickness (same as the predetermined height H) is provided between the second metal substrate 6-1 and the lower pedestal 24, and the second metal is attached to the lower pedestal 24. The substrate 6-2 is positioned, and the second metal substrates 6-1 and 6-2 are fixed to the lower pedestal 24 by the second fixture 28 such as a bolt. At this time, the second
The metal substrate 6-1 is fixed at a predetermined position by the second positioning knock pin 30, and the second metal substrate 6-1 is projected upward from the substrate surface 6F by a predetermined height H to form the second step portion 32, Lower mold 34.

The upper die 22 and the lower die 34 constitute the die 2 so as to form the step beads 40 on the elastic metal plate 38 serving as the main plate of the metal gasket 36.

In this mold 2, the first and second metal substrates 4, 6
The were respectively drilled to 1, by separating the bored portion of the second slit 8 and 10, as shown in Figure 3, the bead width b ₁
A metal gasket 36 having a large step bead 40 of the first and second slits 8 and 10 is formed.
By bringing the drilled parts closer, as shown in FIG.
A metal gasket 36 having a small step bead 40 with a bead width b ₂ is formed.

The predetermined thickness (predetermined height H) of the first and second spacers 14 and 26 interposed when the first and second step portions 20 and 32 are formed in the upper mold 22 and the lower mold 34, respectively. The same as the step bead 40, as shown in FIGS.
The metal gasket 36 can be formed by changing the bead heights of h ₁ and h ₂ .

Reference numeral 44 is a bolt hole for fastening the metal gasket 36.

 Next, the operation will be described.

First, the upper mold 22 and the lower mold 34 of the mold 2, which are opposed to each other,
The elastic metal plate 38 is positioned at a predetermined position between them.

Next, the upper die 22 is pushed by a pressing mechanism such as hydraulic pressure (not shown) to move the elastic metal plate 38 between the respective substrate surfaces 4F and 6F.
Hold the oppression. Then, the elastic metal plate 38 is pressed by the first and second step portions 20 and 32 formed in the upper mold 22 and the lower mold 34, respectively, so that the elastic metal plate 38 is deformed beyond the elastic limit. As shown in FIG. 1, a step bead 40 is formed on the elastic metal plate 38.

As a result, when the slits substantially orthogonal to the substrate surface are formed on the two first and second metal substrates by a cutting device such as a wire cutter (not shown), the positions where the slits are formed are different. The bead width of the step bead can be easily changed, and the bead height of the step bead can be easily changed by changing the thicknesses of the first and second spacers, which speeds up the molding process of the mold.
It can be performed reliably, does not require much labor and time for molding the mold, can improve work efficiency of the mold molding work, is practically advantageous, easy to manufacture, low cost, economical It is also advantageous.

In addition, the positioning of the first and second metal substrates on the upper and lower pedestal portions of the mold can be easily performed by using knock pins, which contributes to improvement of work efficiency of the mold forming work.

Furthermore, since the bead width of the step bead of the metal gasket can be easily changed by the site where the slit is formed in the mold, it is possible to adapt to various demands of the engine and improve the usability.

Furthermore, even if a metal gasket having the same bead height of the step bead is formed, the bead width of the step bead at a desired place can be changed by easily making the slit drilling site different. ,
The elastic coefficient of the step bead can be changed, and the same remarkable effect as when the bead height of the step bead is changed is obtained.

Note that the present invention is not limited to the above-described embodiment, and various application modifications are possible.

For example, in the embodiment of the present invention, the sealing portion is the portion surrounding the combustion chamber hole of the metal gasket, and the first and second slits that are substantially orthogonal to the substrate surface are provided in the portion surrounding the combustion chamber hole. Although each of the first and second metal substrates is divided into two parts, the sealing part may be a part surrounding the fastening bolt hole of the metal gasket or another part.

〔The invention's effect〕

A portion that surrounds the sealing portion of one metal substrate is provided with a slit that is substantially orthogonal to the substrate surface and that divides one metal substrate into two, and that surrounds the sealing portion of another metal substrate. A slit that is substantially orthogonal to the substrate surface and that divides the other metal substrate into two is formed in a region different from the slit-formed region of the one metal substrate, and one of the two divided metal substrates is formed. The upper mold is made to project downward, and the other half of the other metal substrate, which is divided into two and does not face the other half of the other metal substrate, is made to project upward to form the lower mold, and these upper and lower molds are used. Since the mold is formed, the molding process of the mold can be performed quickly and surely, a great deal of labor and time is not required for molding the mold, the work efficiency of the mold molding work can be improved, and it can be used practically. In addition to being advantageous, cost is low and economical It is also advantageous. Further, the bead width of the step bead of the metal gasket can be easily changed by the first and second stepped portions formed in the mold, so that various needs of the engine can be met and usability can be improved. Further, even if a metal gasket having the same bead height of the step bead is formed, the bead width of the step bead at a desired position can be changed by making the slit drilling site different, and the elasticity of the step bead can be changed. The coefficient can be changed, and the same remarkable effect as when changing the bead height of the step bead is achieved.

[Brief description of drawings]

1 to 5 show an embodiment of the present invention, FIG. 1 is a sectional view of a metal mold for forming a step bead of a metal gasket, FIG. 2 is a plan view of the step bead, and FIGS. FIG. 5 is a schematic view of the step bead, and FIG. 5 is a plan view of the metal gasket. In the figure, 2 is a die, 4-4, 4-2 is a first metal substrate, 6, 6-1 and 6-2 are second metal substrates, 4F and 6F are substrate surfaces, and 8 is a first slit. , 10 is a second slit, 12 is an upper pedestal, 14 is a first spacer, 16 is a first fixture, 18 is a first knock pin, 20 is a first stepped portion, 22 is an upper mold, 24 is a lower pedestal, 26 Is a second spacer, 28 is a second fixture, 30 is a second knock pin, 32 is a second step, 34 is a lower mold, 36 is a metal gasket, 38 is an elastic metal plate, and 40 is a step bead.

Claims (2)

(57) [Claims] Claim: What is claimed is: 1. A slit surrounding a sealing portion of one metal substrate is provided substantially at right angles to the surface of the substrate and has one slit for dividing the one metal substrate into two and sealing the other metal substrate. A slit that is substantially orthogonal to the substrate surface and divides the other metal substrate into two is formed in a portion surrounding the portion and in a portion different from the slit formation portion of the one metal substrate. One of the two divided metal substrates is projected downward to form an upper mold, and the other of the two metal substrates is divided into two and one of the one metal substrates which is not opposed to the other is projected upward. A method for forming a bead forming die of a metal gasket, which comprises forming a lower die and forming step beads by these upper and lower die. 2. A slit surrounding one sealing portion of one metal substrate, which is substantially orthogonal to the substrate surface and which divides the one metal substrate into two slits, seals another metal substrate. A slit that is substantially orthogonal to the substrate surface and divides the other metal substrate into two is formed in a portion surrounding the portion and in a portion different from the slit formation portion of the one metal substrate. One of the two divided metal substrates is formed into a desired bead shape surrounding the sealing portion by projecting a predetermined height downward from the substrate surface to provide a first step portion to serve as an upper mold, and the other metal substrate is divided into two. One of the metal substrates is divided into two and the other which does not face each other is formed into a required bead shape surrounding a sealing portion by projecting a predetermined height upward from the substrate surface, and a second step portion is provided to form a lower mold. Step bead by mold Bead formation mold for metal gaskets, characterized in that to constitute a mold to form.