JPH03234971A - Manufacture of surface coating metal gasket - Google Patents

Abstract

PURPOSE:To secure the sealing property by applying a punching process of a gasket under adding excessive parts in anticipation of turning coating of a sealing agent to the rear side of the gasket generated when a flowing curtain passes, and removing the excessive parts after the flowing surface coating is finished. CONSTITUTION:Prior to a flowing coating, a cylinder hole 2, water holes 3, bolt holes 4, an oil hole 5, and the like are formed along the solid lines, and the outline from 1 of a gasket sheet is also formed. The solid lines are formed smaller in various holes, and larger in the outline form 1 than the form of a specific product as the values of excessive amounts anticipating the turning round coating in a flowing coating. The lines 1a to 5a shown in dotted lines are cutting lines by press cutting to remove in a press cutting respectively after the flowing coating is over. When a flowing coating is applied in multi- layers on such a gasket sheet Ga, multilayer coating layers W are generated at the hole end edges and the outline form end edge, but they are removed together with the excessive parts by press cutting along the cutting lines a.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for manufacturing a surface-coated metal gasket, and a surface-coated metal gasket suitable for manufacturing a gasket sheet whose surface is coated by a flow ink coating method. Relating to a manufacturing method.

[Prior art] A fluid surface sealant is applied to a gasket sheet,
As a method for obtaining a surface-coated metal gasket by baking the sealant, a flow ink surface coating method as described in JP-A-62-67370 is known.

As shown in FIG. 2, this coating method involves pumping up the sealant 20 stored in a storage tank 21 with a pump P and passing it through a filter f, and applying the sealant 21 to a film part 23 with slits in a fixed width. Membrane flow ink curtain 25
The gasket sheet 22a, which has been previously perforated and formed into a gasket shape, is conveyed and passed by the conveyor 24 as it passes through the flowing flow intercurtain, thereby obtaining a surface-coated gasket sheet 22b.

Next, the surface-painted gasket sheet 22b is placed in a dryer 27.
This is reversed by a reversing machine 28 or the like and passed through a flow intercurtain similar to the above, and the back surface of the gasket is coated.

In this coating method, the excess sealant 20 that did not participate in the flow ink coating flows into the storage tank 21.
Since the sealant is pumped up again by the pump P and used repeatedly for flow ink coating, no sealant is wasted, and a very economical coating method with high work efficiency can be realized.

[Problems to be Solved by the Invention] However, the surface-coated gasket obtained by such a flow ink surface coating method has a drawback that the sealing performance that should originally be exhibited as a gasket is significantly reduced. This is because when the hole and the gasket-shaped gasket sheet are passed through the flow intercurtain, the edge of the hole and gasket outer periphery facing the direction of movement cuts through the flow ink curtain 25. This is caused by the sealant reaching the back surface and coating it. That is, FIG. 3(a) (this figure shows a cross section around an arbitrary hole in the gasket sheet 10, -
As shown in (the dashed dotted line is the center line of the hole), in any hole of the gasket sheet 10, a surface coating layer 11. In addition to forming a coating layer 11b on the back surface 10b of the sheet. In addition, at the front edge F, the sheet surface 10a does not wrap around the sheet back surface 10b.
A surface coating layer 11a is formed on the surface. After this surface coating, when the sheet is reversed and passed through a floating curtain in the same manner as described above, as shown in FIG. At the same time, a wrap-around coating layer 12b is formed over the already formed surface coating layer 11a, resulting in a multiple coating layer W partially raised from other sealing layers. In addition, at the front edge F, a back coating layer 12a is formed on the back surface 1ob of the sheet, but the wraparound coating layer 1 already formed on the back surface 10b of the sheet is
Multiple coating layers W will be formed on 1b.

The coating layer W shown in FIGS. 3(a) and 3(b) is also formed on the front edge of the outer periphery of the gasket sheet in the direction of travel.

The above explanation is for the case of single-layer coating on the front and back surfaces, but as shown in FIG. In the case of multi-layer coating in which unvulcanized finish coats (13a, 14a) are applied on top of the applied undercoat sealant (11a, 12a), the multiple coated layers W not only become thicker, but also become thicker during undercoating. The wrapped coating layers 11b and 12b are hardened by a vulcanizing agent to increase their rigidity, so when the gasket surfaces are fastened together, the surface pressure in the multiple coating layer W portion is increased, creating gaps in other parts. This results in a reduction in sealing performance.

The present invention was made in view of the above circumstances, and
The purpose of the present invention is to provide a method for manufacturing a surface-coated metal gasket that uses a flow ink surface coating method to eliminate the problem of multiple coating layers occurring due to the gasket surface coating method and ensure the sealing performance of the gasket sheet. do.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the method for manufacturing a surface-coated metal gasket of the present invention includes forming a gasket into a flow ink curtain in which a sealing agent is flowed down from above in the form of a film. In a method for manufacturing a surface-coated metal gasket by a flow ink surface coating method in which the surface coating is performed by passing the gasket sheet, the sealing agent is applied to the back surface of the gasket sheet, which is generated when the flow ink curtain passes through the gasket sheet. The gasket sheet is punched by adding a surplus in consideration of the above, and after the flow ink coating, the surplus is removed by press punching, thereby forming holes of a predetermined size and punching out the outer shape of the surface coating agent. A method for producing a surface-coated metal gasket, the method comprising obtaining a gasket sheet. .

[Effect 1] In the above-mentioned method of the present invention, the gasket seal 1 is coated with an excess amount in consideration of the spread of the sealant to the gasket seal 1 and the back surface due to the flow ink surface coating method. The perforations of the sheet form an external shape, and by removing the excess with a press after applying the flow ink, the surface coating agent gasket sheet of a predetermined shape is removed by removing the part to be applied with the flow ink. If bead molding is not performed later, by drilling only the cylinder hole where the bead is to be formed by adding a surplus amount before applying the flow ink, it is possible to avoid wrinkles caused by bead molding. Therefore, except when applying flow ink painting after bead forming, or when applying flow ink painting to materials that include material distortion caused by heat treatment to increase the strength of the stainless steel material after bead forming, it is not necessary to drill holes in the gasket sheet. It is possible to perform flow ink painting without applying any paint, and then punch out all the holes after painting. As a result, the number of steps can be reduced, and it is possible to manufacture gaskets with consistent coating thickness, similar to when punching and punching out the outer shape using ordinary seal coating materials.

Regarding the outer shape of the gasket, taking into consideration that wrap-around coating during flow ink coating occurs on the edge facing the direction of gasket movement, but not on both sides, the outer shape on both sides is If you determine the final product dimensions before painting with flow ink, and cut out the outer shape by adding an extra amount to allow for wrap-around coating at the edge of the gasket in the direction of movement,
After painting with flow ink, only the excess parts at both ends of the gasket in the direction of movement are required to be punched out.

[Embodiment 1] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1(a) is a partial plan view of the gasket sheet Ga.

Before applying flow ink, holes such as the cylinder hole 2, water hole 3, bolt hole 4, oil hole 5, etc. are formed along the practical part in the figure, and the outer shape 1 of the gasket sheet is also formed.

However, the part indicated by the solid line in the figure is the gasket shape and hole shape before the flow ink coating, and the various holes are made smaller by the excess amount that takes into account the wrap-around coating layer from the flow ink coating than the prescribed product shape. , the outer shape of the gasket sheet is larger.

la, 2a, 3a, 4a, and 5a indicated by dotted lines in the figure should be removed by press punching after flow ink painting for gasket sheet outline 1, cylinder hole 2, water hole 3, bolt hole 4, and oil hole 5, respectively. This is the press cutting line.

How far away the press cutting line shown by the dotted line should be formed from the solid line shape, that is, how much surplus should be formed, depends on the conditions of flow ink coating, for example, when a metal gasket passes through a flow ink curtain. It should be determined by the width of the sealant that changes depending on the moving speed and the like.

When flow ink coating is performed in multiple layers on such a gasket sheet Ga, multiple coating layers W are generated at the edge of the hole and the edge of the outer shape, but as shown in FIG. By press-cutting using a well-known press-cutting device 9, a metal gasket G having a predetermined product shape from which the excess portion including the multiple coating layers W has been removed is obtained.

In the case shown in Fig. 1(b), the perforations of the gasket sheet Gb before flow ink painting are performed on the cylinder hole 2 and the processing reference hole 6 after painting, and the gasket outer shape is changed in the direction of gasket movement during flow ink painting. It was punched out to a size with extra parts added only to the front and rear edges.

For this gasket sheet Gb, after painting with flow ink, press cut lines 1a, 2a, 3a are also applied in the same manner as above.
, 4a and 5a, it is possible to obtain a metal gasket having a predetermined product shape from which the excess portion including the multiple coating layers W has been removed.

Gasket Seat 1-G before flow ink painting like this
In the case where the hole b is made in the cylinder hole 2,
Painted metal gaskets with excellent shape and dimensions, which can avoid wrinkles during bead forming after flow ink painting, and can also obtain a hole shape that eliminates the distortion that occurs when the material is heat treated to increase strength. can be obtained.

Furthermore, since the outer shape of the gasket has surplus parts added only to the front and rear edges in the direction of gasket movement during flow ink painting, the removal of the surplus parts by punching out is more difficult than that shown in Figure 1(a). It becomes easier.

In the case shown in Figure 1(c), the perforations of the gasket sheet GC before flow ink painting are not processed at all, and the outer shape of the gasket is changed from the gasket 1 to the front and rear edges only, as shown in Figure 1(b). It is formed with additional dimensions, and a machining reference groove 7 is provided on the outer periphery after painting.

In this case, punching along the press cutting cutting line a after flow ink coating can be performed for all holes and external shapes in one step. As a result, it is possible to manufacture gaskets without variations in coating film thickness, as in the case of punching and punching out the outer shape using painted, commercially available seal coating materials.

Furthermore, what is shown in FIG. 1(d) is shown in FIG. 1(a) to (
Regarding the gasket sheet shown in C), this is an example in which punching along the cutting line 1a of the outer shape 1 is not necessary. This can be applied to locations where it is not inconvenient to install the gasket with the outer peripheral portion protruding from the sealing area. in this case,
The gasket is used with multiple coating layers W attached to the excess portion of the outer edge of the gasket.

[Effects of the Invention] As explained above, in the present invention, a metal gasket sheet is formed with a contour formed in advance in anticipation of the wrap-around coating part on the back surface caused by flow ink coating, and after the flow ink coating is applied, , since the above-mentioned surplus portion can be removed by press punching to obtain a predetermined product shape, the conventional flow ink coating method can be used as is, and the wrap-around coating, which was a drawback of flow ink coating, can be eliminated.
A metal gasket sheet with excellent sealing properties can be manufactured.

2

[Brief explanation of drawings]

1(a) to 1(d) are partial plan views of various gasket sheets according to the method of the present invention, FIG. Figure 2 is an explanatory diagram of the conventional flow ink coating method, Figure 3
Figures (a) to (c) are cross-sectional views for explaining the multiple coating layers of sealant produced on the holes and outer edges of the gasket sheet by the flow ink coating method. Ga, Gb, Gc...Gasket sheet 1a...Press punch cutting line 2a of gasket sheet...Press punch cutting line 3a of cylinder hole...Press punch cutting line 4a of water hole...Press punch cutting line 4a of bolt hole Press punch cutting line 5a...Press punch cutting line a of oil hole...Press punch cutting line, W
...Multiple coating layer d (ljfIj to ω size m field

Claims (1)

[Claims] (1) Manufacture of a surface-coated metal gasket using a flow ink surface coating method in which surface coating is performed by passing a gasket sheet shaped into a gasket through a flow intercurtain in which a film of sealant flows down from above. In the method, the gasket sheet is punched by adding a surplus that takes into account the amount of the sealant that is applied to the back surface of the gasket sheet when it passes through the flow intercurtain, and after the flow ink surface is coated, the gasket sheet is punched. A method for manufacturing a surface-coated metal gasket, which comprises obtaining a surface-coated gasket sheet with holes of a predetermined size and outline punched by removing the excess dimension using a punching press.