JP3064466B2 - Manufacturing method of metal gasket - Google Patents

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 in which a hole is formed in a metal substrate and a metal ring is welded around the hole, and more particularly as a cylinder head gasket, an exhaust manifold gasket and the like for an internal combustion engine. The present invention relates to a method for manufacturing a suitable metal gasket.

[0002]

2. Description of the Related Art It is well known that a gasket is interposed between joining members to prevent leakage of a pressure fluid from a joining surface. For example, in a cylinder head gasket interposed between a cylinder head and a cylinder block of an internal combustion engine, sealing is difficult because the combustion gas not only has high temperature and high pressure but also has large changes in temperature and pressure. For this reason, various gaskets have been proposed, but recently, a metal gasket made of a metal plate has attracted attention. For example, a plurality of holes through which a pressure fluid such as a combustion gas passes are formed in a metal substrate, and beads are formed in the substrate around each of the holes so that a high surface pressure can be secured on the joining member. Is known.

[0003] For example, Japanese Patent Laid-Open Publication No. Sho 59-188955 discloses a metal gasket made of a plate thinner than a convex height of a bead in order to prevent the bead from being plastically deformed by a tightening force and deteriorating sealing performance. One in which a surface pressure adjusting plate is provided in a portion other than a bead has been proposed.

[0004]

The surface pressure adjusting plate is made of a material having a sealing property so that the bead can be compressed and deformed to function as a sealing member, and the bead can function as a sealing member by itself. It is desirable to
In consideration of assemblability, thickness control, cost, and the like, it is preferable that the metal ring be joined to the peripheral portion of the hole of the substrate.

[0005] As a means for joining the metal ring to a metal substrate, welding is optimal. However, in the case where a plurality of fluid holes are formed continuously, such as a metal gasket for an internal combustion engine, the gap between adjacent fluid holes is narrow, so the width of the metal ring must be reduced. . For this reason, the holding allowance of the welding jig for the metal ring cannot be sufficient.
Welding work becomes difficult.

Accordingly, the present invention relates to a method for manufacturing a metal gasket, in which a metal ring is joined to a metal substrate.
The purpose is to facilitate welding work and ensure good productivity.

[0007]

In order to achieve the above object, the present invention provides a metal substrate having a fluid hole through which a pressurized fluid passes, and a communication hole having a smaller diameter than the fluid hole.
After disposing a metal ring having an inner diameter smaller than the fluid hole at the periphery of the communication hole, sandwiching the metal ring and the substrate on the inner peripheral side of the communication hole, and welding the metal ring to the substrate. The fluid hole is formed by cutting off both the inner peripheral end of the communication hole and the inner peripheral end of the metal ring of the substrate.

Further, the present invention provides a method for manufacturing a semiconductor device, comprising the steps of: forming a fluid hole through which a pressure fluid passes through a metal substrate; disposing a metal ring having an inner diameter smaller than the fluid hole at a peripheral portion of the fluid hole; After the metal ring is welded to the substrate, the inner end of the metal ring may be cut off to form a predetermined diameter.

Further, according to the present invention, a substantially circular metal sub-plate is disposed at a predetermined position on a metal substrate and held at the predetermined position, and the sub-plate is placed along the outer periphery of the sub-plate. After welding to the sub-plate, a substantially circular communication hole concentric with the sub-plate and smaller in diameter than the sub-plate is formed in the sub-plate and the substrate to form a fluid hole through which a pressure fluid passes. Good.

[0010]

In the method of manufacturing a metal gasket according to the present invention, first, a communication hole having a smaller diameter than the fluid hole is formed in a metal substrate forming a fluid hole through which a pressure fluid passes.
Next, a metal ring having an inner diameter smaller than that of the fluid hole is arranged on the periphery of the communication hole of the substrate, and the metal ring and the substrate are sandwiched by a predetermined jig on the inner peripheral side of the communication hole. Then, the metal ring is welded to the substrate in this state. That is, the metal ring is welded while being held integrally with the substrate. Finally, the inner peripheral end of the communication hole of the substrate and the inner peripheral end of the metal ring are cut off to form a fluid hole.

In the method of manufacturing a metal gasket according to the second aspect, first, a fluid hole through which a pressure fluid passes is formed in a metal substrate. Next, a metal ring having an inner diameter smaller than that of the fluid hole is arranged at a peripheral portion of the fluid hole of the substrate, and pressed against the substrate by a predetermined jig.
Then, after the metal ring is welded to the substrate, the inner peripheral end of the metal ring is cut off to have a predetermined diameter. That is, the inner diameter of the metal ring is formed to be the same as or smaller than the fluid hole.

Further, in the method for manufacturing a metal gasket according to the third aspect, first, a predetermined position of a metal substrate,
That is, a substantially circular metal sub-plate is disposed at a position where a fluid hole is to be formed, and is held at that position by a predetermined jig.
In this state, the sub-plate is welded to the substrate along the outer periphery of the sub-plate. Next, a substantially circular communication hole concentric with the sub-plate and smaller in diameter than the sub-plate is formed in the sub-plate and the substrate. Accordingly, a metal ring having a width equal to the difference between the diameter of the sub-plate and the diameter of the communication hole is joined to the substrate at the periphery of the communication hole. Thus, when the substrate is disposed between the members to be joined, the communication hole becomes a fluid hole through which the pressure fluid passes.

[0013]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a method for manufacturing a metal gasket according to the present invention. As the metal gasket to which the present invention is applied, for example, a cylinder head gasket interposed between a cylinder head and a cylinder block of a multi-cylinder internal combustion engine is preferable, and the number of combustion chambers corresponding to the number of cylinders as fluid holes is preferable. It has holes and the like.

First, an embodiment of the present invention will be described with reference to FIGS. An elastic metal plate, for example, a stainless steel plate is pressed, and as shown in FIGS.
In addition, a communication hole 2a, a bolt hole 2b, a cooling water hole (not shown), a lubricating oil hole (not shown), and the like are formed, and a bead 3 is formed. The communication hole 2a is an internal combustion engine (not shown).
(For example, four) according to the number of cylinders
The diameter d is smaller than the diameter D of the combustion chamber hole 2 formed later on the substrate 1 and surrounding the combustion chamber (not shown) of the internal combustion engine. In addition, a flat opening end 1a is formed at the peripheral edge of the communication hole 2a of the substrate 1 up to the bead 3.

Next, a metal ring, that is, a so-called shim ring 4 of a ring-shaped metal plate is arranged on the opening end 1a on the convex side of the bead 3. The shim ring 4 is formed by, for example, stamping out a stainless steel plate thinner than the height of the convex portion of the bead 3 into an annular shape by a separate press working, and has an inner diameter smaller than the diameter D of the combustion chamber hole and substantially the same as the communication hole 2a. The diameter is formed.

Then, the shim ring 4 is welded to the substrate 1 over the entire circumference by, for example, a laser welding machine. FIG. 4 is a view for explaining a welding step of welding the shim ring 4 to the substrate 1, and shows the table 11, the holding table 12, and the focus head 13 of the laser welding machine used in the present embodiment. The table 11 has a communication hole 2 a and an opening 11 a corresponding to the inner diameter of the shim ring 4. Presser table 12
Is formed so as to fit into the opening 11a of the table 11, and a pressing portion 12a protruding in the radial direction is formed at the upper end thereof.

The welding process will be described in order.
The substrate 1 on which the a and the like are formed is placed on the table 11 with the convex portion of the bead 3 facing upward, and the shim ring 4 is arranged at the open end 1a of the substrate 1 so that the inner diameter thereof is concentric with the communication hole 2a. . Next, the lower part of the holding table 12 is moved to the opening 1 of the table 11.
1a, the holding portion 12a is brought into contact with the inner peripheral end of the shim ring 4, the shim ring 4 is sandwiched between the table 11 and the holding table 12, and both are fixed by bolts (not shown) or the like. Is fixed.

The shim ring 4 is irradiated with a laser beam while the table 11 is moved along the circumference of the shim ring 4 with respect to the focus head 13, and the shim ring 4 is welded to the open end 1a of the substrate 1 over the entire circumference. I do. Of course, the focus head 13 may be moved with respect to the table 11. In short, the focus head 13 may be relatively moved with respect to the substrate 1 and the shim ring 4 which are the workpieces. Further, the laser beam may be intermittently applied to the shim ring 4 without being applied continuously. Thus, as shown in FIG. 2, a welded portion 5 is formed, and the shim ring 4 is firmly joined to the substrate 1.

Thereafter, the substrate 1 is cut at a position shown by a dashed line in FIG. 1 by press working, laser processing or the like, and the inner peripheral end of the communication hole 2a of the opening end 1a and the inner peripheral end of the shim ring 4 are cut. The part is resected. Thus, a combustion chamber hole 2 is formed on the inner peripheral side of the substrate 1 and the shim ring 4 as shown in FIGS. That is, the opening end of the substrate 1 is changed from the communication hole 2a shown by the two-dot chain line in FIG.

As described above, the shim ring 4 and the substrate 1 have a sufficient allowance for the holding jig for the holding jig for the welding jig, and the welding operation can be easily performed. Then, the inner peripheral end of the communication hole 2a of the opening end 1a used as the holding margin and the inner peripheral end of the shim ring 4 are cut off later, so that the desired narrow shim ring 4 is formed. .

FIGS. 5 and 6 relate to another embodiment of the method of manufacturing a metal gasket of the present invention.
Unlike the embodiment, the combustion chamber hole 2 is formed before moving to the welding step. The opening 11a of the table 11 is formed to have a diameter substantially matching the combustion chamber hole 2. The shim ring 4 is the same as the embodiment shown in FIG. 1 and is formed with an inner diameter d smaller than the diameter D of the combustion chamber hole 2.

The step of welding the shim ring 4 to the substrate 1 in this embodiment will be described. First, the substrate 1 is placed on the table 11 such that the convex portion of the bead 3 faces upward. Next, the inner peripheral end of the shim ring 4 is sandwiched between the lower surface of the holding portion 12 a of the holding table 12 and the upper surface of the holder 14, and in this state, the holding table 12 and the holder 14 are
a, and the shim ring 4 is pressed against the substrate 1.
That is, the shim ring 4 is held while being pressed against the substrate 1,
The welding is performed in the same manner as in the embodiment shown in FIGS.

Then, the inner peripheral end of the shim ring 4 is cut off at a predetermined diameter D ₁ by press working, laser processing or the like.
Thus, as shown in FIG. 6, the inner peripheral end of the shim rings 4, the difference between the diameter D and the diameter D ₁ of the combustion chamber hole 2, a protruding shape from the substrate 1. The diameter D ₁ of the cut portion of the shim ring 4 may be set to the same diameter as the diameter D, and this case is similar to the embodiment shown in FIG.

As described above, in this embodiment, since the shim ring 4 is welded to the substrate 1 and only the inner peripheral end of the shim ring 4 is cut off, the present embodiment is smaller than the embodiment of FIGS. Only the cutting force is needed. However, also in this embodiment, the communication hole 2a is formed in the substrate 1 as in the embodiment of FIG.
After the shim ring 4 is welded, the both may be cut off to form the combustion chamber hole 2.

In each of the above-described embodiments, a small positioning hole (for example, indicated by 6 in FIG. 3) is formed at the inner peripheral end of the shim ring 4 which is cut off after welding. I can put it. In particular, when the combustion chamber hole 2 formed in the substrate 1 is not a perfect circle, and thus a shim ring 4 that is not a perfect circle is joined to the substrate 1, the shim ring 4 is positioned based on the small hole 6 and welded. In this case, the shim ring 4 can be securely joined to a predetermined position of the substrate 1. Moreover, the portion where the positioning small holes 6 are formed is cut off after welding, so that the function as a metal gasket is not impaired.

FIG. 7 relates to still another embodiment of the method for manufacturing a metal gasket according to the present invention. In FIG. 7, the substrate 1 is formed after the beads 3 are formed and before the combustion chamber holes 2 are formed. ,
A circular metal sub-plate 40 is disposed at a predetermined position where the combustion chamber hole 2 is to be formed. The diameter D _{0 of the} auxiliary plate 40 is set to be the same as the outer diameter of the shim ring 4 of the above-described embodiment. Positioning at this time can be easily performed by forming a small hole (not shown) on the inner peripheral side of the combustion chamber hole 2 to be formed, similarly to the above-described embodiment. Then, the sub-plate 40 and the substrate 1 are held in the above state by, for example, pressing the sub-plate 40 against the substrate 1 with a predetermined jig (not shown).

Next, similarly to the above-described embodiment, the sub-plate 40 is welded to the substrate 1 along the entire periphery by the laser welding machine, and the welded portion 5 is formed as shown by a broken line in FIG. You. Then, a communication hole having a diameter D smaller than the diameter D ₀ and concentric with the sub-plate 40 is formed by, for example, laser processing, and the combustion chamber hole 2 is formed. That is, similar to the embodiment of FIG. 2, a shim ring 4 having a width of a difference between the diameter D ₀ and the diameter D is joined around the combustion chamber hole 2 of the substrate 1.

As described above, according to the present embodiment, the holes need only be formed once, so that the number of steps can be reduced as compared with the above-described embodiment. The positioning between the sub-plate 40 and the substrate 1 at the time of welding and drilling can be easily performed by using a paint or the like instead of the small holes described above. The outer shape of the sub-plate 40 is not limited to a perfect circle but may be an ellipse or the like, but is preferably formed so as to correspond to the shape of the combustion chamber hole 2.

When the metal gasket manufactured as described above is mounted on the internal combustion engine and a fastening force is applied, first, the convex portion of the bead 3 shown in FIG. Since the height of 3 is greater than the thickness of shim ring 4, bead 3 is deformed. Then, when the shim ring 4 and the substrate 1 are tightened between the cylinder block and the cylinder head, the deformation of the bead 3 does not proceed any further and the beads 3 come into close contact with each other with their elastic restoring force.
In addition, since the shim ring 4 is formed to have a narrow width as described above, a high surface pressure is secured around the combustion chamber hole 2, and a good sealing property is obtained.

[0030]

Since the present invention is configured as described above, the following effects can be obtained. That is, according to the method for manufacturing a metal gasket of the present invention, when joining the metal ring to the metal substrate, the metal ring having an inner diameter smaller than the fluid hole is welded to the substrate, and then the inner peripheral end is cut off. Since the fluid holes are formed by using the thin metal ring, it can be easily joined even when a narrow metal ring is provided, and good productivity can be secured.

In the method of cutting off only the inner peripheral end of the metal ring after welding, the metal ring can be manufactured with a small cutting force.

Furthermore, in the method of drilling a communication hole after welding the sub-plate to the substrate, the process of drilling the hole only needs to be performed once, so that it can be manufactured with few steps.

[Brief description of the drawings]

FIG. 1 is an enlarged sectional view showing a state in which a substrate and a metal ring are sandwiched in a method for manufacturing a metal gasket according to one embodiment of the present invention.

FIG. 2 is a partial cross-sectional view of a metal gasket manufactured by a manufacturing method according to one embodiment of the present invention.

FIG. 3 is a plan view of a part of a metal gasket manufactured by a manufacturing method according to one embodiment of the present invention.

FIG. 4 is a cross-sectional view showing a step of welding a metal ring to a substrate in the manufacturing method according to one embodiment of the present invention.

FIG. 5 is an enlarged cross-sectional view showing a state where a metal ring is pressed against a substrate in a manufacturing method according to another embodiment of the present invention.

FIG. 6 is a partial cross-sectional view of a metal gasket manufactured by a manufacturing method according to another embodiment of the present invention.

FIG. 7 is a cross-sectional view showing a state where a sub-plate is arranged on a substrate in a manufacturing method according to still another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Substrate 1a Open end part 2 Combustion chamber hole 2a Communication hole 3 Bead 4 Shim ring (metal ring) 11 Table 12 Holder 13 Focus head 14 Holder 40 Secondary plate

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Shozo Iwasaki 3-65 Midorigaoka, Toyota City, Aichi Prefecture Inside Taitoyo Kogyo Co., Ltd. (56) References JP-A-62-278375 (JP, A) JP-A-59- 188955 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16J 15/00-15/14 B23K 26/00 310

Claims (3)

(57) [Claims] 1. A communication substrate having a smaller diameter than the fluid hole is formed in a metal substrate forming a fluid hole through which a pressure fluid passes.
After disposing a metal ring having an inner diameter smaller than the fluid hole at the periphery of the communication hole, sandwiching the metal ring and the substrate on the inner peripheral side of the communication hole, and welding the metal ring to the substrate. A method of manufacturing the metal gasket, wherein both the inner end of the communication hole of the substrate and the inner end of the metal ring are cut off to form the fluid hole. 2. A fluid hole through which a pressurized fluid passes is formed in a metal substrate, and a metal ring having an inner diameter smaller than the fluid hole is arranged at a peripheral portion of the fluid hole and pressed against the substrate. A method for manufacturing a metal gasket, comprising: after welding the metal ring to the substrate, cutting off an inner peripheral end of the metal ring to form a predetermined diameter. 3. A method of disposing a substantially circular metal sub-plate at a predetermined position on a metal substrate, holding the sub-plate at the predetermined position, and welding the sub-plate to the substrate along the outer periphery of the sub-plate. A metal gasket, characterized in that a substantially circular communication hole concentric with the sub-plate and smaller in diameter than the sub-plate is formed in the sub-plate and the substrate to form a fluid hole through which a pressure fluid passes. Production method.