JPS6152938A - Forming method of die for bead forming of metallic gasket and its die - Google Patents

Abstract

PURPOSE:To form the bead having a different spring constant according to the sealing place by providing the projection of the necessary bead shape surrounding the sealing place for a male die and the opening of the necessary bead shape having different width according to the sealing place for a female die. CONSTITUTION:The slit 6 of the necessary bead shape surrounding the sealing place of a metallic gasket 26 is made for the male die 4 consisting of a metallic plate and the projection 12 is formed with projecting a metallic strip 8 to the prescribed height from the plate face 10. Similarly for a female die 14 the opening 16 of the necessary bead shape is provided with differentiating the width W1 according to the sealing place as well as corresponding to the projection 12. The necessary beads 42, 46, 48 are thus formed on the gasket 26 by holding with strong pressure the original plate 28n with locating the main plate 28 and the plate 28n of the metallic gasket 26 between the dies 4, 14. Accordingly the bead differentiating a spring constant by the sealing place can be formed on a metallic gasket.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a method for forming a metal gasket bead forming mold and the mold, and particularly relates to a method for forming a bead with a different spring constant depending on the sealing location. The present invention relates to a method for forming a mold for forming a metal gasket and the mold.

[Prior Art] A metal gasket is known that elastically seals the joint surface by pressing a bead formed on an elastic metal plate against the joint surface using bolt fastening force to form a seal line. The beads of this metal gasket are press-formed using a pair of molds consisting of a male mold and a female mold. That is, one of the metal substrates to be paired is made into a male shape by cutting and protruding a protrusion on the surface of one of the substrates, and the other metal substrate is formed with a groove-like recess corresponding to the protrusion. It is a female type.

A metal plate is sandwiched between the male mold and the female mold and held under strong pressure to form a bead.

By the way, different fastening forces are applied to each part of the joint surface at the time of fastening. For example, a large fastening force acts near the bolt fastening part, and the fastening force weakens as the bolt moves away from the fastening part. Therefore, as shown in Figure 7, the metal gas furnace
If the hole bead 42 of the bolt hole 40, which is the bolt fastening part 6, is not formed into a bead with a small spring constant, for example, a bead with a low bead height relative to the bead width, the fastening force will be concentrated on the hole bead 42. This has the disadvantage that a fastening force may be applied to the bead at a portion spaced apart from the bolt hole 40, resulting in leakage. On the other hand, an inner bead 4 surrounding a bore hole 44 located at a portion spaced apart from the bolt hole 40, which is a fastening portion.
6 and the intermediate portion of the outer bead 48 have a weak fastening force, so it is necessary to form a bead with a large spring constant, for example, a bead with a high bead height relative to the bead width.

[Problems to be solved by the invention] However, 1. Conventionally, as mentioned above, a bead is formed by a protrusion cut into the male die and a groove-shaped depression cut into the female die, so the bead height is changed to vary the spring constant depending on the sealing location. To form this, it is necessary to cut and form protrusions with height differences on the substrate surface. For this reason, the molding method of the mold becomes complicated and complicated, and the molding requires a great deal of labor and time, resulting in an extremely expensive mold.

[Objective of the Invention] Therefore, the present invention solves such problems and realizes a method for forming a metal gasket bead forming mold and a mold thereof that can form beads with different spring constants depending on the sealing location. The purpose is to

[Means for Solving the Problems] In order to achieve this object, the present invention uses a metal substrate as a male mold, and forms a protruding portion by protruding from the substrate surface at a predetermined height in a required bead shape surrounding the sealing area. The invention is characterized in that the other metal substrate is used as a female mold and is opposed to the protruding portion of the first gold mud substrate, and has an opening in a desired bead shape with a width varying depending on the sealing location. A male mold is formed by providing a protrusion in the desired bead shape surrounding the sealing area at a predetermined height above the substrate surface, and forming a male mold on the other metal substrate, facing the protrusion of the first metal substrate. It is also characterized by having an opening in a desired bead shape with a width varying depending on the sealing location to form a female mold.

[Function] According to the present invention, the male die is provided with a protrusion in a required bead shape that surrounds the sealing location and protrudes from the substrate surface by a predetermined height, and the female die is provided with a protrusion that faces the protrusion and has a width that differs depending on the sealing location. Furthermore, by providing an opening in a desired bead shape, it is possible to easily mold and obtain a mold for forming a fully flexing gas furnace having a bead with a different spring constant depending on the sealing location.

[Example code] Next, this invention will be explained in detail based on an implementation side number diagram.

1 to 5 show an embodiment of the present invention.

In the figure, reference numeral 2 denotes a bead forming mold for the metal gasket 26, which is composed of two metal substrates. One of the metal substrates is a male die 4, and a slit 6 is formed in the male die 4 in a desired bead shape surrounding the sealing area using a cutting device such as a wire cutter (not shown). A metal strip 8 is firmly embedded in the slit 6 so as to protrude from the substrate surface 10 by a predetermined height h, thereby forming a protrusion 12. On the other hand, the other metal substrate is a female mold 14, which is opened into a desired bead shape by a cutting device such as a wire cutter, facing the protrusion 12 of the metal strip 8 embedded in the male mold 4, and having a width different depending on the sealing location. Division 16 is established. This opening 16 is
The width increases as it approaches the bolted area.
Create a slit with the same width on the top and bottom. That is, the bolt hole 40
The width of the opening 16 of the female mold 14 that forms the inner bead 46 and the outer bead 48 surrounding the bore hole 44 located at a portion away from the hole 44 is such that the width of the opening 16 of the female mold 14 is such that the width of the opening 16 of the female mold 14 is such that the width of the original plate 28n, which will be described later, is determined by the protrusion 12 having the predetermined height h. In order to deform beyond the elastic limit, it is formed into a W shape with a narrower width as it moves away from the bolt hole 40, as shown in FIG. Conversely, the width of the opening 16 of the female die 14 gradually increases as it approaches the bolt hole 40.
The width of the opening 16 of the surrounding hole bead 42 is set at a fifth angle so that the protrusion 12 having a predetermined height h deforms the original plate 28n (to be described later) slightly beyond the elastic limit or within the elastic limit.
As shown in the figure, it is formed to have a wide width W2.

The protrusion 12 of the metal band plate 8 of the male mold 4 and the opening 16 of the female mold 14 are aligned to face each other, and the male mold 4 and the female mold 1 are connected to each other.
4 are fixed to the pedestals 18 and 20 with fixing tools 22 such as bolts, and the mold 2 is completed. In addition, in the figure, 24 is the female type 1
4 is a substrate surface, 26 is a metal gasket, and 28 is a main plate of the metal gasket 26.

Note that the protrusion 12 and the opening 16 can also be carved directly into the substrate surfaces 10 and 24, respectively.

Next, the operation of this embodiment will be explained.

As shown in Figures 4 and 5, first, the male mold 4 and the female mold 1 were placed opposite each other.
An original plate 28n made of an elastic metal plate for forming beads of the metal gasket 26 is positioned at a predetermined position between the metal gasket 26 and the metal gasket 26. Next, the female die 14 is pushed forward by hydraulic pressure or the like, and the original plate 28n is held under strong pressure between the respective substrate surfaces 10 and 24. At this time, the width of the opening 16 of the female die 14 facing the protrusion 12 of the predetermined height h of the metal strip plate 8 embedded in the male die 4 is formed to increase as it approaches the bolt hole 40. ing. Therefore, as shown in FIG. 4, the opening 16 of the female die 14 has a small width Wl.
In this case, the original plate 28n is deformed beyond its elastic limit by being pressed by the protrusion 12, and a bead 30 with a small bead width w1 and a large bouncing constant is formed as shown by the dashed line. be done. On the other hand, since the width of the opening 16 increases as it approaches the bolt hole 40, the bead is gradually formed to have a large bead width and a small spring constant relative to the bead height. As shown in FIG. 5, when the width of the opening 16 increases to a large width W2, the original plate 28n is pressed by the protrusion 1 and deforms slightly beyond its elastic limit, making it wider than the bead height. A bead 32 having a bead width W1 and a small spring constant is formed. Alternatively, by deforming within the elastic limit, the original plate 28n can be restored when the female mold 14 is retired, and beads can be prevented from forming.

In this way, due to the protrusion 12 having a predetermined height h and the opening 16 of the female die 14 whose width increases as it approaches the bolt fastening part, a bead width near the bolt fastening part is wide relative to the bead height. A bead with a small spring constant is formed, and a bead with a large spring constant and a narrow bead width relative to the bead height is formed as the distance from the fastening region increases. Alternatively, no beads may be formed. Therefore, it is possible to easily form a mold that forms a metal gasket with desired performance, which has beads with different bead widths relative to bead heights and different spring constants depending on the sealing location.

FIG. 63 shows another embodiment of the invention.

The feature of this embodiment is that a slit 34 is formed in the female mold 14 in a desired bead shape opposite to the protrusion 12 of the metal strip 8 embedded in the male mold 4 using a cutting device such as a wire cutter. The bolt hole 4 is inserted into the board surface 24 of this slit 34.
Required width W3 of an inclined opening that widens toward the substrate surface side such that the width increases as it approaches 0 and decreases as it moves away from 0.
The reason is that an opening 36 is opened. By forming the metal gasket in this manner, the cutting amount of the opening 34 of the female die 14 can be reduced when forming a metal gasket having desired performance and having beads 38 having different bead widths and spring constants with respect to the bead height as described above. Only a small amount is required, making molding easier and reducing the amount of labor and time required. In addition,
Of course, it is also possible to directly carve the opening 36 consisting of an inclined opening into the substrate surface 24 of the female mold 14 without forming the slit 34.

[Effects of the Invention] As described above, according to the method for forming a metal gasket bead forming mold of the present invention and the mold, one metal substrate is made into a male mold, and the substrate surface is shaped into a desired bead shape surrounding a sealing area. A protrusion is provided at a predetermined height from the metal substrate, and the other metal substrate is made of a female type and is opposed to the protrusion and has an opening in the desired bead shape with a width varying depending on the sealing location. It is possible to easily form a mold for forming a metal gasket with desired performance, which has beads with different spring constants depending on the sealing location by varying the bead width with respect to the height. In addition, for example, by providing an opening on the female mold board surface that widens toward the end, the width increases as it approaches the bolt fastening area, thereby reducing the amount of cutting during mold molding and saving labor. time can be further reduced.

[Brief explanation of drawings]

The figures show an embodiment of the present invention, Figures 1 and 2 are cross-sectional views showing the molding state of the male and female molds, Figure 3 is a cross-sectional view of the main parts of the mold, and Figures 4 and 5 are bead forming, respectively. FIG. 6 is a cross-sectional view of the main part showing another embodiment in a bead forming state, and FIG. 7 is a plan view of the gas vent. In the figure, 2 is a mold, 4 is a male mold, 6 is a slit, 8 is a metal strip, 12 is a protrusion, 14 is a female mold, 16 and 36 are openings, 26 is a metal gasket, 28 is a main plate, 28n is the original plate, 30, 32, 38 are beads, wl-w2, W3
is the width of the opening 16, and h is the height of the protrusion 12. Agent Patent Attorney Yoshimi Saigo Agent Patent Attorney Hara 1) Yuki Oshi

Claims (1)

[Scope of Claims] 1. One metal substrate is used as a male type, and a protrusion is provided in a required bead shape surrounding the sealing area by a predetermined height protruding from the substrate surface, and the other metal substrate is used as a female type, and a protrusion is provided in the desired bead shape surrounding the sealing area, and the other metal substrate is used as a female type. A method for forming a metal gasket bead forming mold, characterized in that an opening is provided in a desired bead shape, facing a protrusion of a metal substrate and having a width that varies depending on the sealing location. 2. One metal substrate is provided with a protrusion in a required bead shape that protrudes from the substrate surface at a predetermined height to surround the sealing area to form a male mold, and the other metal substrate is provided with a protrusion part of the first metal substrate. 1. A mold for forming a bead for a metal gasket, characterized in that the female mold has an opening in a desired bead shape, facing the opposite sides and having a width different depending on the sealing location.