JPH01215416A - Method for forming die for forming elastic bead on metallic gasket and its die - Google Patents

Abstract

PURPOSE:To improve the die forming efficiency by piercing slits having different pierced positions on two superposed metallic base plates and a spacer to form a die by two metallic base plates and a spacer. CONSTITUTION:A 1st slit 5 is pierced so that a site enclosing sealed places while two metallic base plates 2, 3 and a spacer 4 are superposed, intersects nearly at right angles to the surfaces of base plates 2F, 3F and a 2nd slit 6 is pierced at a site different from the set site of the 1st as it interests nearly at right angles to the surface of base plates 2F, 3F. Parts cut by the 1st slit 5 and the 2nd slit 6 are removed to produce clearances 7, 8, one side of the 1st metallic base plate 2 is protruded by the spacer 4 downwards to make an upper die 13, the other side of the other metallic base plate 3 is protruded by the spacer 4 upwards to make the lower die 18 and a die is formed easily by the upper and the lower die to improve the die forming efficiency.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for forming a mold for forming an elastic bead of a metal gasket and the mold, and particularly relates to a method for forming a mold for forming an elastic bead of a metal gasket. A method for forming a mold for forming an elastic bead of a metal gasket, which improves the efficiency of mold molding work by drilling slits at different locations and forming a mold using two metal substrates and a spacer, and the mold. Regarding.

[Conventional technology]

A metal gasket is a material that elastically seals a joint surface by pressing an elastic bead formed on an elastic metal plate with a bolt to form a seal line. In addition, metal gaskets are
By using a pair of molds consisting of a male mold having a protrusion protruding from one surface of one metal substrate, and a female mold having a groove-like recess corresponding to the protrusion formed in the other metal substrate. , an elastic bead is press-formed on an elastic metal plate.

[Problem that the invention seeks to solve]

A conventional molding method for a mold for forming an elastic bead of a metal gasket and the mold include forming slits in approximately the same shape in the male mold and the female mold, and inserting a metal strip into the slit in one of the slits that should be the male mold. was embedded to form a protrusion.

For this reason, high precision is required when aligning the male protrusion on one side with the female slit on the other side, making the molding process difficult and requiring a large amount of labor to form the mold. This method is disadvantageous in that it requires cost and time and is economically disadvantageous.

[Purpose of the invention]

In this invention, while two metal substrates and a spacer are piled up, a first slit is bored in a region surrounding a sealing point so as to be substantially orthogonal to the substrate surface, and the first slit is Second slits that are substantially orthogonal to the substrate surface are bored at different locations, and the pieces cut by the first and second slits are removed to expose a gap, and one of the metal substrates is The metal substrate is made to protrude downward by the spacer to form an upper mold, and the other metal substrate is made to protrude upward by the spacer to form a lower mold, and these upper and lower molds form an elastic mold. The present invention provides a method for forming a mold for forming an elastic bead of a metal gasket and the mold, which eliminates the need for large labor, cost, and time for mold molding and improves the efficiency of mold molding work.

[Means for solving problems]

In this invention, while two metal substrates and a spacer are piled up, a first slit is bored in a region surrounding a sealing point so as to be substantially orthogonal to the substrate surface, and the first slit is drilling second slits substantially perpendicular to the substrate surface at different locations, removing the pieces cut by the first slit and the second slit to expose a gap;
One of the metal substrates is made to protrude downward by the spacer to form an upper mold, and the other metal substrate is made to protrude upward by the spacer to form a lower mold, and an elastic bead is formed by these upper and lower molds. It is characterized by

Furthermore, while the two metal substrates and the spacer are piled up, a first slit that is substantially orthogonal to the substrate surface is bored in a region surrounding the sealing point, and a first slit is bored in a region different from the first slit bored region. A second slit is formed substantially perpendicular to the substrate surface, and the pieces cut by the first slit and the second slit are removed to expose a gap, and one of the metal substrates is attached to the spacer. A required bead shape surrounding the sealing area is formed by protruding downward from the substrate surface to a predetermined height, and a first stepped part is provided as an upper mold, and the other metal substrate is formed into the required bead shape surrounding the sealing area using the spacer. A second stepped portion is provided to protrude upward from the substrate surface by a predetermined height to form a lower mold, and an elastic bead of a desired shape is formed by the first stepped portion, second stepped portion of the upper and lower molds, and the gap. The feature is that the mold is configured to suit the purpose.

[Effect]

According to the present invention, while the two metal substrates and the spacer are piled up, the first slit is bored in the area surrounding the sealing area so as to be substantially orthogonal to the substrate surface, and the first slit is
A second slit that is substantially perpendicular to the substrate surface is bored at a different location from the slit drilling location, and the pieces cut by the first slit and the second slit are removed to expose a gap. One of the metal substrates is made to protrude downward by a spacer to form an upper mold, and the other metal substrate is made to protrude upward by a spacer to form a lower mold, and the mold is easily formed by the upper and lower molds. and improve mold forming work efficiency.

〔Example〕

1 to 7 show embodiments of the invention. 1 is a mold for forming an elastic bead, for example a step bead, of a metal gasket 19 which will be described later. The mold 1 is composed of two first and second metal substrates 2.3 and a spacer 4.

That is, first, the two first and second metal substrates 2.3 and the spacer 4 are arranged from above as the spacer 4, the first metal substrate 2, and the second metal substrate 3, as shown in FIG. While the metal substrates 2.3 and the spacer 4 are piled up, a first sealing portion that is substantially perpendicular to the substrate surfaces 2F and 3F is placed at a sealing location, for example, a portion surrounding a combustion chamber hole 22 of a metal gasket 19, which will be described later. A slit 5 is formed using a cutting device such as a wire cutter (not shown), and the first metal substrate 2 is cut into the first metal substrate 2 -
1.2-2, the second metal substrate 3 is divided into two second metal substrates 3-1.3-2, and the spacer 4
is also divided into a first spacer 4-1 and a second spacer 4-2.

In addition, as shown in FIG. 2, at a location different from the first slit 5 drilling location, for example, at a location spaced apart by a distance S from the first slit 5 drilling location, a second slit substantially perpendicular to the substrate surfaces 2F and 3F is provided. 2 slits 6 are formed, and the first metal substrate 2
is divided into three parts, the second metal substrate 3 is divided into three parts, and the spacer 4 is also divided into three parts.

As shown in FIG. 2.3, the substrate piece 2 is cut by the first slit 5 and the second slit 6.
-3.Remove 3-3 and spacer piece 4-3 to create gap 7.
．． Make 8 appear.

One of the first metal substrates 2, for example, the first metal substrate 2-2
2F of the board surface in the required bead shape surrounding the sealing area.
It is provided to protrude downward by a predetermined height T. That is, as shown in FIG. 1, the first spacer 4-1 having a predetermined thickness (same as the predetermined height T) is interposed between the first metal substrate 2-1 and the upper pedestal 9, and the upper pedestal 9 A first metal substrate 2-2 is fixed thereon, and the first metal substrates 2-1 and 2-2 are respectively fixed to the upper pedestal 9 with first fixtures 10 such as bolts. The first metal substrate 2-1 is 1/10
The first metal substrate 2 is fixed in a predetermined position by a first positioning knob 11 having a dimensional accuracy of about 0 mm.
-1 is made to protrude downward by a predetermined height T from the substrate surface 2F to form a first stepped portion 12, which is used as an upper mold 13.

Further, the other of the second metal substrates 3, for example, a second metal substrate 3-2 that does not face the first metal substrate 2-1, is formed into a desired bead shape surrounding the sealing area by a predetermined height upward from the substrate surface 3F. It is provided so that only T protrudes. In other words, as shown in FIG.
2 and a second metal substrate 3 on the lower pedestal 14.
-1, and fix the second metal substrate 3-1, 3-2 to the lower pedestal 14 with a second fixture 15 such as a bolt. At this time, the second metal substrate 3-1 is fixed in a predetermined position by a second positioning knock pin 32 having a dimensional accuracy of about 1/100W, similar to the first knock pin 11, and the second metal substrate 3-1 is made to protrude upward from the substrate surface 3F by a predetermined height T to form a second stepped portion 17, thereby forming a lower mold 18.

The upper mold 13 and the lower mold 18 constitute the mold 1 in order to form a step bead 21 on the elastic metal plate 20 which becomes the main plate of the metal gasket 19.

In this mold 2, the first and second metal substrates 4.6
By increasing the gap 7.8 formed in the step bead 21 with a large bead width Wl, as shown in FIG.
On the other hand, by making the gap 7.8 small, a metal gasket 19 having a step bead 21 with a small bead width W2 is formed as shown in FIG. 6.

Further, the upper mold 13 and the lower mold 18 have first and second molds.
The first and second portions interposed when forming the stepped portion 12.17
By changing the thickness of the spacer 4-1.4-2, the bead height of the step bead 21 can be changed to Hl or Hl, as shown in FIG.
It has a configuration that can form a. Note that the reference numeral 23 is a bolt hole for fastening when the metal gasket 19 is interposed between a cylinder head (not shown) and a cylinder block.

Next, the effect will be explained.

First, the elastic metal plate 20 is placed at a predetermined position between the upper mold 13 and the lower mold 18 of the mold 1, which are arranged to face each other.

Next, the upper mold 13 is pushed forward by a pressing mechanism (not shown) using hydraulic pressure or the like, and the elastic metal plate 20 is held under strong pressure between the respective substrate surfaces 2F and 3F.

As a result, the elastic metal plate 20 is pressed by the first step part 12 of the upper mold 13 and the second step part 17 of the lower mold 18, and the elastic metal plate is deformed beyond its elastic limit. As shown in FIG. 1, a step bead 21 is formed on an elastic metal plate 20.

For this purpose, first and second slits that are substantially orthogonal to the substrate surface are simultaneously bored in the two stacked first and second metal substrates and the spacer using a cutting device (not shown), and the gap is When forming the slits, the size of the gap can be changed by making the slits different, and the bead width of the step bead can be easily changed. By changing the thickness of the 11th and 2nd spacers, the step bead can be easily changed. The bead height of the mold can be easily changed, making it easy to mold the mold, eliminating the need for large amounts of labor, cost, and time for mold molding, and improving the efficiency of mold molding work. In addition to being able to improve the performance, it is easy to manufacture, and the cost is low, making it economically viable.

In addition, when forming step beads for metal gas furnaces and throats using molds, by exposing the gap, it is possible to visually check the bead width of the step bead formed depending on the size of the gap, thereby avoiding various troubles. This can contribute to

Furthermore, the positioning of the first and second metal substrates and the spacer on the upper and lower pedestal portions of the mold can be easily and reliably performed using dowel pins with a dimensional accuracy of about 1/100 dragon, making the mold molding work easier. This contributes to improving efficiency.

Furthermore, the bead width of the step bead of the metal gasket can be changed depending on the gap formed in the mold, and the elastic modulus of the step bead can be changed as desired, thereby improving usability.

Furthermore, even if metal gaskets with the same bead height are formed, the gap size can be easily varied, and the bead width of the step bead at a desired location can be partially changed. This produces the same effect as changing the bead height by changing the elastic modulus of the bead.

It should be noted that the present invention is not limited to the above-described embodiments, and of course can be modified in various ways.

For example, in an embodiment of the invention, first and second portions of the metal gasket, which are substantially perpendicular to the substrate surface, are provided in a portion surrounding the combustion chamber hole.
Although slits are drilled to form gaps in the first and second metal substrates, the sealing location may be the fastening bolt hole, which is a location other than the combustion chamber hole described above, or any other location. be.

Furthermore, in the embodiments of the invention, a mold and a molding method for forming an elastic bead, such as a step bead, have been described. By doing so, it is also possible to form a mold that forms a convex bead.

〔Effect of the invention〕

According to this invention, while the two metal substrate spacers are stacked on top of each other, the first slit is bored in the area surrounding the sealing area so as to be substantially perpendicular to the substrate surface, and the first slit is formed in the area surrounding the sealing area. drilling a second slit substantially orthogonal to the substrate surface at a different location, and removing the pieces cut by the first slit and the second slit to expose a gap;
One of the metal substrates is made to protrude downward by the spacer to form an upper mold, and the other metal substrate is made to protrude upward by the spacer to form a lower mold, and an elastic bead is formed by these upper and lower molds. Therefore, the molding operation can be easily performed, and a great deal of labor and time are not required for molding the mold, and the efficiency of the molding operation can be improved and the cost can be reduced.

In addition, since the bead width of the elastic bead of the metal gasket can be easily changed depending on the gap formed in the mold, the elastic modulus of the step bead can be changed as desired, and it can be adapted to the various needs of the engine. and improve usability.

Furthermore, even if a metal gasket is formed with the same bead height of the elastic beads, by making the gap size different, the bead width of the elastic beads can be changed at a desired location, and the elasticity of the elastic beads can be changed. coefficients can be varied,
This produces the same effect as when changing the bead height of the elastic bead.

[Brief explanation of the drawing]

1 to 7 show embodiments of the present invention. FIG. 1 is a cross-sectional view of the main part of a mold for forming a step bead of a metal gasket, and FIG. 1. A schematic enlarged sectional view of a state in which a second slit is formed; FIG. 4 is a plan view of the step bead, FIGS. 5 and 6 are schematic views of the step bead, and FIG. 7 is a plan view of the metal gasket. Explanation of the symbols 1 is the mold, 2.2-1.2-2 is the first metal substrate, 3.3-1.3-2 is the second metal substrate, 2F and 3F are the substrate surfaces, 4.4-1 .4-2 is a spacer, 5 is a first slit, 6 is a second slit, 7.8 is a gap, 9 is an upper pedestal, 10 is a first fixture,
11 is the first knock pin, 12 is the first step portion, 1
3 is the upper mold, I4 is the lower pedestal, 15 is the second fixture, 16 is the second knock pin, 17 is the second step, 18
is the lower mold, 9 is the metal gasket, 20 is the elastic metal plate, and 21 is the step bead.

Claims (1)

[Claims] One or two metal substrates and a spacer are piled up, and a first slit is formed so that the area surrounding the sealing area is substantially orthogonal to the substrate surface, and the first slit is A second slit that is substantially perpendicular to the substrate surface is bored in a different part from the drilled part, and the pieces cut by the first slit and the second slit are removed to expose a gap. One of the metal substrates is made to protrude downward by the spacer to form an upper mold, the other metal substrate is made to protrude upward by the spacer to form a lower mold, and an elastic bead is formed by these upper and lower molds. A method for forming a mold for forming an elastic bead of a metal gasket, characterized by: 2. With the two metal substrates and the spacer stacked one on top of the other, a first plate that is approximately perpendicular to the substrate surface is placed in the area surrounding the sealing area.
A slit is drilled, and a second slit that is substantially perpendicular to the substrate surface is bored at a different location from the first slit, and the pieces cut by the first slit and the second slit are removed. to expose a gap, one of the metal substrates is formed into a required bead shape that surrounds the sealing area with the spacer, and protrudes downward from the substrate surface to a predetermined height to provide a first stepped portion to serve as an upper mold; The other of the metal substrates is formed into a required bead shape surrounding the sealing area by the spacer and protrudes upward from the substrate surface by a predetermined height to provide a second stepped portion to form a lower mold, and a first stepped portion of these upper and lower molds. 1. A mold for forming an elastic bead of a metal gasket, characterized in that the mold is configured to form an elastic bead of a desired shape by the second stepped portion and the gap.