WO2013042471A1

WO2013042471A1 - Seal plate with spacer and manufacturing method therefor

Info

Publication number: WO2013042471A1
Application number: PCT/JP2012/070071
Authority: WO
Inventors: 貫一山本; 熊谷　卓也; 昭憲小森
Original assignee: 興国インテック株式会社
Priority date: 2011-09-22
Filing date: 2012-08-07
Publication date: 2013-03-28
Also published as: JP2013068276A

Abstract

The purpose of the invention is to reduce the module size and reduce cost by disposing the rubber seal near the through hole, which has an irregularly shaped spacer of a uniform thickness. A metal seal plate (10) having multiple through holes (11, 12) and spacers (13) formed around the through holes (11, 12) as a result of press working and a rubber seal (9) formed by molding, the seal plate being characterized in that: the spacers (13) are formed to have irregular shapes by burring and curling and to have a prescribed height and smoothness by hemming; and the rubber seal (9) is formed along a seal line that is near the spacers (13) by a molding process using the multiple through holes (11, 12) as references.

Description

Seal plate with spacer and manufacturing method thereof

In the present invention, a protruding portion is formed in a cylindrical shape by burring processing, a spacer is formed in a circular shape or a different shape around the periphery of the hole, and a rubber seal having a sealing function is formed by molding in the vicinity of the spacer. The present invention relates to a seal plate with a spacer and a manufacturing method thereof.

As shown in FIGS. 5 (a), 5 (b), and 5 (c), the conventional seal plate has an annular O-ring 54 fitted into a groove 51 formed on the seal plate 50, and the O-ring. The structure which latches 54 was common. Therefore, when the seal plate 50 is attached to the body main body with a fastening screw, as shown in FIG. 5 (b), a circular gap providing a uniform gap between the body main body and the seal plate 50 in order to cause the O-ring 54 to exert a sealing function, or A washer 53 formed in a different shape that secures the distance from the side wall is welded 55 to the screw hole 52, and a gasket having a predetermined thickness is sandwiched and tightened to disperse the uniform distance and fastening load. Yes.

In addition, as another structure, after a pilot hole is formed in the seal plate, a protruding part is formed by performing burring on the peripheral edge of the pilot hole. There is a problem that cracks occur at the tip of the protrusion due to the stress, and the creation process is devised as a solution.

For example, a burring process in which a bulge is first formed in the workpiece by first drawing or overhanging, and a cylindrical hole is formed by opening a lower hole in the center of the bulge and pushing the peripheral edge of the lower hole. Has been made.

In addition, after opening the pilot hole, the peripheral part of the pilot hole is pushed in by burring to form a cylindrical protruding part, and the protruding part and its surrounding part are further pushed out in the protruding direction. A processing method for expanding the height of the protruding portion by performing is known (for example, see Patent Document 1).

JP-A-6-269863

However, due to the downsizing of devices and the like to be mounted, the seal plate has also been downsized. Accordingly, the plate thickness of the seal plate, the height of the rubber seal, the height of the protrusion formed by burring, etc. are highly accurate. Tend to seek. In response to this requirement, the conventional seal structure in which an O-ring is inserted into the groove has a problem of the plate thickness necessary for forming the groove and the flatness due to the burr at the tip of the protrusion formed by burring. There is a problem that the lowering and the unevenness of the height occur, and the cylindrical portion buckles when the tightening screw is tightened further because the cylindrical protrusion is thin. Therefore, it is not possible to construct a protruding part by burring processing in the vicinity of a sealing material such as an O-ring, and a method of sandwiching and fastening a gasket with a predetermined thickness in order to obtain a more uniform height. Because of the necessity of securing the gasket mounting interval, it is an obstacle to miniaturization.

In addition, the rubber seal is made thin, thin, and precise by a molding method that forms a rubber seal by filling a high-temperature rubber mold, which has come into use with the downsizing and cost reduction of equipment, with a high pressure sealant. It became possible to form. However, when fixing the seal plate with the fastening screws, the rubber seal exerts a high sealing function by compressing and fixing it to an arbitrary tightening allowance. The range in which the spacer is provided is limited, and the shape of the rubber seal is complicated, resulting in a problem that the sealing function exhibited by the required uniform pressing cannot be satisfied.

In addition, as the main body of the device is further downsized and the seal plate is also downsized, the width and height of the rubber seal tend to be smaller and more precise, and the rubber seal tightening margin that affects the sealing function is made uniform. And high precision is required. In order to meet the demands for uniform and high precision of the tightening allowance, it is impossible to obtain uniform accuracy with the protrusions formed by conventional burring, so weld a cylindrical or irregular shaped washer with a predetermined height with solder. Or, it was necessary to retrofit with caulking or the like. However, it has been difficult to secure the positional accuracy and direction accuracy of the washer that is retrofitted, and there has been a problem that the cost is increased due to an increase in work processes including adjustment.

The present invention has the following configurations (1) to (4) in order to achieve the above object.

(1) A metal seal plate having a plurality of through holes and spacers formed around the through holes by pressing, and further having a rubber seal formed by molding, wherein the spacers are burring The rubber seal has a predetermined height and flatness by hemming and is formed by machining and curling, and the rubber seal is formed along the seal line adjacent to the spacer by molding with the plurality of through holes as a reference. A seal plate with a spacer, characterized by being formed.

(2) A method of manufacturing a metal seal plate having a plurality of through holes and spacers formed around the through holes by pressing, and further having a rubber seal formed by molding. Forming a plurality of through holes at a predetermined position of the metal plate at the same time, forming a peripheral portion of the through holes into a cylindrical protrusion by burring, and The step of forming an arbitrary irregularly shaped spacer that is folded back in the radial direction of the through hole by curling while restraining the cylindrical protrusion, and the spacer has a predetermined height and flatness by hemming In the process of forming on the spacer seat surface provided and the molding process based on the plurality of through holes, the process continues along a seal line adjacent to the spacer set in advance on the seal plate. Method for producing a spacer with a seal plate, wherein the step of forming the rubber seal, in that it consists of.

(3) In the curling process, the irregularly shaped spacer seat surface is formed by performing a plurality of precision bending processes that plastically deform while changing the shape of the spacer. The method for producing a seal plate with a spacer according to the above (2), wherein:

(4) The rubber seal is selected from natural rubber, silicon rubber, acrylic rubber, fluorine rubber, ethylene / propylene rubber, synthetic rubber, thermosetting resin, and thermoplastic elastomer resin. (2) The manufacturing method of the sealing plate with a spacer as described.

By a burring method that can form a uniform spacer, a flat seating surface that receives a fastening load is formed into a uniform or circular shape of any height, and a spacer can be formed into a predetermined shape by a molding method that can accurately mold a rubber seal. By forming a rubber seal having a uniform height with a tightening allowance, a seal plate with a spacer having a structure that exhibits an optimum sealing effect for the rubber seal can be provided.

In addition, the spacer shape can be easily and precisely formed in any different shape according to the specifications, making it possible to reduce the space between the spacer and the rubber seal, and manufacturing a seal plate with a spacer that can reduce the module size of the seal plate. Can provide a method.

In addition, the mold processing method that improves the sealing accuracy enables the rubber seal to be integrated with the seal plate to achieve downsizing, and the cost can be reduced by reducing the number of manufacturing steps, and the number of steps for assembling the parts can be greatly reduced. A manufacturing method of a seal plate with a spacer can be provided.

The perspective view which shows the structure which attaches the seal plate with a spacer which concerns on a present Example to a to-be-mounted body. (A) A view showing a configuration of a seal plate with a spacer according to the present embodiment, (b) AA cross-sectional view, (c) A cross-sectional view showing a joined state of the seal plate and the mounted body, (d) B Partial enlarged view, (e) Partial enlarged view of part C The figure which shows the process of a burring process, (a) Pilot hole process, (b) Burring process, (c) Curling process, (d) Hemming process (A) Cross-sectional view showing the process of forming a rubber seal by the molding method, (b) Diagram showing the positional relationship between the upper and lower rubber molds and the seal plate by the molding method (A) Perspective view showing structure of conventional seal plate, (b) Front view showing structure of seal plate, (c) CC sectional view

Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to examples. The shape of the seal plate with spacers used in the examples is a preparation example for easily explaining the spacer formed by the burring method on the seal plate and the rubber seal formed by the mold method. It is not intended to limit.

FIG. 1 shows a mounting structure for mounting the seal plate 10 with a spacer according to the present embodiment on the mounting surface of the body body 3 that is the mounted body with four fastening screws 8. Hereinafter, a seal plate 10 with a spacer that covers the drain opening 4 of the body body 3 and a manufacturing method thereof will be described.

The body main body 3 has a drain inspection part attached to an engine, a hydraulic device, or a precision instrument having a driving part as a mounted body, a drain opening 4 on a mounting surface of the body main body 3, and seal plates in four places. Fastening holes 5 and through holes 6 are formed.

The seal plate 10 with a spacer of this embodiment includes a convex truncated cone-shaped lid portion 7 that covers the drain opening 4, and a rubber seal 9 that is formed by a molding process so as to surround the lid portion 7. The body body 3 has a through hole 12 that contacts the through hole 6 and a screw hole 11 through which the fastening screw 8 passes. A spacer 13 is formed in the through hole 12 and the screw hole 11 by a burring method. The three side surfaces of the seal plate 1 are bent to substantially the same height as the seating surface of the spacer 13, and the other side surface is a side surface having a different height to prevent erroneous mounting. Both of the four side surfaces may be the same height as the seating surface of the spacer 13, and differ depending on the structure of the corresponding mounting surface.

In addition, the seal plate 10 with a spacer is formed by precisely forming a rubber seal 9 at an arbitrary position by a molding method on the seal plate 1 formed by a burring method that enables formation of a spacer 13 having a different shape. A manufacturing method capable of reducing the module size can be provided.

FIG. 2 shows a configuration of the seal plate 10 with a spacer according to the present embodiment. 2A shows a joining surface of the seal plate 10 with the spacer, FIG. 2B is a cross-sectional view taken along the line AA of the seal plate 10 with the spacer, and FIG. 2C shows the body body 3 and the seal plate 10 with the spacer. 2D is an enlarged view of a portion B of the seal plate 10 with a spacer, FIG. 2E is a portion C of the body main body 3, the spacer 13 and the rubber seal 9 at the time of joining. It is an enlarged view.

On the joint surface of the plate 1 with the body main body 3 shown in FIG. 2A, irregularly shaped spacers 13 are burring in four

screw holes

11a, 11b, 11c, 11d into which four fastening screws 8 are inserted. The spacer 13 is formed by a processing method, and the spacer seating surface is flat and has a uniform height. Similarly to the screw hole 11, the through hole 12 is also precisely formed in a different shape by a burring process so that the rubber seal 9 can be arranged as close as possible in millimeters. The spacer 13 of the screw hole 11 and the through hole 12 has a flat seat surface with the same height k.

A rubber seal 9 formed with a predetermined width j and height h by a molding method is annularly arranged on the seal plate 10 with a spacer so as to surround the outer edge of the convex lid portion 7. The formation position of the rubber seal 9 can be formed in any shape on the seal plate 1 with an accuracy of millimeters according to specifications.

FIG. 2B is a cross-sectional view of the joining surface of the spacer-attached seal plate 10 according to the present invention shown in FIG. By integrally molding the spacer 13 by the method, the spacer seat surface that receives the fastening load of the fastening screw 8 is flat and has a structure having a uniform height k and wall thickness m. In the conventional fastening method, a predetermined fastening allowance d and fastening load pressure are distributed by sandwiching a gasket having a uniform wall thickness, but the formed spacer 13 has a performance sufficiently satisfying the required specifications. By having it, the structure which does not require a gasket was attained. As shown in the enlarged B sectional view of FIG. 2D, the spacer 13 receives the fastening load of the fastening screw 8 on a spacer seat surface formed flat and at a uniform height k.

When the rubber seal 9 formed at a predetermined height h by the molding method on the seal plate 10 with the spacer shown in FIG. 2C is mounted on the mounting surface of the body body 3 with the fastening screw 8, FIG. As shown in the enlarged sectional view of the C part in e), the top part 9a of the rubber seal 9 abuts on the body body 3 and is compressed to a predetermined tightening allowance d, thereby exhibiting the maximum sealing effect. The gap 7 with the body body 3 is maintained at a uniform height by the height k of the spacers 13 formed in the four

screw holes

11a, 11b, 11c, and 11d and the through-hole 12, so that the lid portion 7 is removed. The rubber seal 9 disposed so as to surround the structure has a structure in which the fastening shaft pressure is not applied beyond a predetermined fastening allowance d.

The rubber seal 9 having a sealing function is formed by a precise rubber seal 9 having a uniform width j and height h by molding such as injection molding or direct pressure molding in which a high temperature rubber mold is filled with a sealing material at high temperature and high pressure. Is done. The rubber seal 9 is designed so as to exhibit the maximum sealing effect when it is subjected to a predetermined pressure for compression to a predetermined tightening allowance d.

In addition, when the rubber seal 9 is molded by the molding method, it means a general molding method in which a sealing material is poured into a rubber mold, and includes any of injection molding of injection molding, compression molding of direct pressure molding, etc. However, the rubber seal 9 can be molded, and the molding process is not limited to injection molding.

The rubber seal 9 is made of natural rubber, silicone rubber, acrylic rubber, fluorine rubber, synthetic rubber such as ethylene / propylene rubber, thermosetting resin, thermoplastic elastomer, resin, etc. Depending on the environmental conditions such as temperature, pressure, resistance, etc. and the required performance, a single material or a sealing material combining materials is selected. In addition, since the material of the sealing material used for the rubber seal 9 is selected according to required specifications, the present invention is not limited.

Further, the screw hole 11 and the spacer seating surface are precisely formed in different shapes by a burring method of press working, and the rubber seal 9 is disposed in the vicinity of the spacer 13 of the screw hole 11 with millimeter accuracy. The sizes of the seal plate 1 and the body main body 3 can be reduced, and further, since no gasket is required, the number of components to be configured can be reduced and the cost can be reduced.

The seal plate 10 with the spacer is a combination of a molding method for accurately forming the rubber seal 9 at a predetermined position and a burring method for forming the spacer 13 in a different shape in the screw hole 11 or the like drilled at the accurate position. By constructing the manufacturing method, it is possible to manufacture the seal plate 10 with a high precision spacer corresponding to the required product specifications at a low cost.

<Spacer formation by burring method>
FIG. 3 shows, as a creation example, a process for creating the spacer 13 formed in the through hole 12 of the seal plate 10 with the spacer. In conventional burring and forging processes, the flatness and height are not uniform, or the fastening screws are not accurate due to distortion or burrs at the tip of the protrusion, which has been the cause of failure to satisfy the specifications that require high processing accuracy. This solves the problem that the protruding portion buckles when 8 is tightened.

Conventionally, a gasket having a uniform thickness has been used for the accuracy of the seating surface, but the spacer 13 formed on the seal plate 1 is formed with a predetermined thickness m and height k with high accuracy. In addition, the spacer 13 has a flat and flat flat surface with high precision (tolerance class K or higher).

Furthermore, the spacer 13 formed in the screw hole 11 and the through-hole 12 can be accurately processed into any irregular shape, so that the rubber seal 9 integrated with the seal plate 1 can be accurately measured in millimeters even in a small and narrow space. It is the biggest advantage that can be arranged in.

A burring method for forming the irregularly shaped spacer 13 added to the through hole 12 shown in FIG. 3 will be described. The basic flow of the formation process of the spacer 13 includes the pilot hole processing shown in FIG. 3 (a), the burring processing for forming the spacer 13 shown in FIG. 3 (b), and the spacer 13 shown in FIG. 4 (c). The spacer 13 is formed by a curling process for forming an arbitrary shape, thickness and width, and a burring process method comprising four steps by a hemming process for performing a forging process for flattening the seating surface of the spacer 13 shown in FIG. Has been.

3A, the lower hole 14 is formed with the mold 31, and the burring process of FIG. 3B is used to form the mold 32 and the spacer 13 that bulge the periphery of the lower hole 14 into a cylindrical shape. A mold 33 that determines the required thickness m and height k is joined from above and below to form a cylindrical protrusion, and a through-hole 12 having a predetermined diameter is formed.

In the curling process of FIG. 3 (c), the protrusion 34 is bent by the die 34 so as to ensure the shape (round shape, irregular shape) and thickness of the spacer 13 and the width of the seat surface, and the seat. Precision bending is performed so that cracks and wrinkles do not occur on the surface. When the actual spacer 13 is formed in a different shape, a process of plastic deformation is performed while gradually changing the shape through a plurality of precision bending processes in the curling process.

In the hemming process of FIG. 3D, a predetermined height and shape of the spacer 13 and a flat seat surface are formed by the mold 35 to adjust the burrs, burrs, flatness of the seat surface, and the height dimension of the spacer 13. For this purpose, a spacer 13 having a uniform height k that secures a fastening allowance d of the rubber seal 9 and a seating surface that receives a fastening load when the fastening screw 8 is tightened further is formed.

The spacer 13 formed by the burring method can obtain the pressure-receiving area of the seating surface with sufficient flatness and load bearing performance, so that not only the strength of the spacer 13 itself but also the seal plate 1 has high rigidity. Thus, it also has a function of protecting the body main body 3 from bending or deformation, or from an external force that is dented or damaged. In addition to the irregular-shaped spacer 13 shown in the creation example of FIG. 3, in the case of a circular spacer, it is created by basic press die processing, which is also referred to as single round hole processing, and pilot hole processing, burring processing, curling processing, It may be a burring method in which a pair of press dies used for hemming is combined and formed by a reciprocating motion of the press dies.

In addition, the spacer 13 formed in a different shape of the screw hole 11 and the through hole 12 of the seal plate 10 with the spacer has a different thickness and shape due to the die 34 in the curling process shown in FIG. In the hemming process shown in FIG. 3D, the flatness of the spacer seat surface is formed with high accuracy (tolerance grade K or more) by forging process by the die 35.

Since the seal plate 1 produced by the burring method does not require a gasket, the spacer 13 is formed by forming the spacer shape in a different shape while securing a necessary thickness of the seating surface. The module size can be reduced by minimizing the interval between and. Further, as in the case of the conventional seal plate 50 shown in FIG. 5, when the washer 53 having a different shape formed separately is welded 55 with solder or the like and retrofitted with caulking or the like, the positional accuracy of the washer 55 attached or The problem that it was difficult to ensure the directional accuracy can be solved, and the manufacturing cost can be reduced by integrally forming the spacer 13 in a series of manufacturing steps.

In the burring method shown in FIG. 3, when the protruding portion is forged into a cylindrical shape by burring at a predetermined position of the seal plate 1, it is also possible to burring both the lower hole 14 and the spacer 13 into different shapes. Like the screw hole 11 of the seal plate 10 with a spacer of this embodiment, the screw hole 11 can be circular and only the spacer 13 can be subjected to burring processing. The spacer 13 formed by the burring method has a uniform height k and a flat and flat seating surface, thereby causing the rubber seal 9 precisely formed by the molding method to exhibit optimum sealing performance. Therefore, a predetermined fastening allowance d can be ensured. In addition, the spacer 13 formed by the burring method is processed to ensure load bearing performance and pressure receiving area corresponding to the fastening load so that the protruding portion does not buckle.

In the burring method, the press mold used for burring is a mold structure that can change the working diameter of the pilot hole according to the change in plate thickness, and the mold used for curling and hemming is It has a mold structure designed to prevent cracks, wrinkles, scratches, burrs, and burrs on the spacer seating surface.

<Formation of rubber seal by molding method>
4A and 4B, a process for forming the rubber seal 9 with the rubber mold 20 of the molding method will be described. When the rubber seal 9 is molded by the molding method, the molding method is performed by pouring the sealing material into the rubber mold 20 by injection molding for injection molding of the heat-melted sealing material, or direct pressure molding using a heating and pressure press. The rubber seal 9 can be molded by any molding process such as compression molding. However, in the description of the molding process of this embodiment, a typical injection molding process will be described as an example.

As shown in FIG. 4A, injection molding is performed in which a seal plate 1 is sandwiched between a high temperature upper mold 20a and a lower mold 20b, and a preheat-treated seal material is injected from an injection tube 23 of the upper mold 20a. Thus, the rubber seal 9 having a uniform width j and height h can be formed. The mold processing method has a problem in that the plate thickness of the seal plate cannot be reduced due to the structure in which the conventional seal plate 50 is inserted into the groove 51 formed on the plate, and the screw hole 11 or the through hole 12. This solves the problem that the module cannot be miniaturized because the sealing material cannot be disposed close to the module.

The rubber mold 20 for injection molding shown in FIG. 4B is located at the position where the rubber seal 9 is formed on the seal plate 1 with reference to the spindle-shaped projection 28 and the truncated cone 27 of the lower mold 20b. A high-precision rubber seal mold having a uniform width j and height h is engraved in the seal-shaped groove 21 of the upper mold 20a.

The basic process of the mold processing method is that a seal plate 1 to which an adhesive is applied along a predetermined seal line is applied to a screw hole 11, a through hole 12, a lid portion formed in the seal plate 1 by a burring method 7, the spindle-shaped protrusion 28 and the convex frustoconical portion 27 having the same shape to be in close contact with the lid 7 are placed on the precisely formed lower mold 20 b. Next, a spindle groove-shaped fixed groove portion 26 corresponding to the spindle-shaped projection portion 28 of the lower mold 20b and a recess portion 25 corresponding to the projection of the lid portion 7 are designated from the upper surface of the placed seal plate 1. An on-rubber mold 20 having a seal-shaped groove 21 that forms a rubber seal 9 on the seal line is pressed and fixed. Then, the heat-treated seal material is injected into the seal-shaped groove 21 from the seal

material injection pipes

23a and 23b through the

gate portions

22a and 22b, and the rubber seal 9 is injection-molded on the seal line to which the adhesive is applied. When the rubber mold 20 and the seal plate 1 are in contact with each other, the seal material is filled in the seal-shaped groove 21 and solidified, so that the seal material is bonded to the seal plate 1 and has a uniform width j and height h. A highly accurate rubber seal 9 is formed.

The upper mold 20a and the lower mold 20b of the upper and lower rubber molds 20 used in the molding process can be obtained by precisely molding the spacers 13 in an accurate position and height and different shapes by the burring process. It is possible to form the rubber seal 9 precisely by forming it close to the spacer 13 on the order of millimeter units (about 0.05 mm range), which can reduce the module size and reduce the cost. This is a factor that can provide a seal plate 10 with a spacer.

Rubber, resin, and the like used for the sealing material are preheated in advance to a fluid state by heating at a low temperature (generally around 50 ° C.). The preheated sealing material is filled through the sealing material injection pipe 23 at a predetermined injection pressure (10 to 3000 kgf / cm ² ) from the gate portion 22 of the high temperature upper mold 20a in which the seal-shaped groove 21 is formed. It is performed in the step of solidifying. In the rubber mold 20 for injection molding, a seal-shaped groove 21 having a width j and a height h of the rubber seal 9 to be formed is engraved. When the material used for the sealing material is formed of a thermoplastic resin or a thermosetting resin, different process management is required for each temperature control, cycle time, etc., but the basic process is the same.

When a thermoplastic resin is used for the sealing material, it is generally said that when the thermoplastic resin is heated to about 200 ° C. or higher, the molecular chain begins to undergo oxidative decomposition. Because the material cannot be heated too much, it is necessary to inject and fill at a high speed and a high pressure in order to process the seal material in a high viscosity state. In addition, when using a thermosetting resin, the thermosetting resin in a melt state preheated to about 50 ° C. does not require a high filling pressure because of its low viscosity, but it takes time to solidify. , The cycle time becomes longer. Therefore, depending on the sealing material to be used, it is necessary to appropriately modify and carry out the process of forming the rubber seal 9 by the molding method. The preheating temperature is not limited because the temperature setting varies considerably depending on the sealing material used.

The rubber seal 9 is positioned by forming a spindle-shaped protrusion 28 on the rubber mold 20 corresponding to the through hole 6 and the screw hole 11 in actual processing, and sandwiching the seal plate 1 with the formed rubber mold 20. Thus, the hole reference is basically based on the through hole 6 or the screw hole 11 into which the protrusion 28 is inserted as a reference point. In the press die processing described above, the through hole 6 and the screw hole 11 on the seal plate 1 in both the molding method and the burring method are used as reference points for determining the seal formation position and the position and height of the spacer 13. did. However, the reference position in this embodiment is particularly important in burring processing such as pilot hole processing that requires positional accuracy of the seal plate 1 and mold processing for forming the rubber seal 9 at a predetermined position. According to the specifications of the seal plate 1 to be created, a pilot hole or surface that is an optimal reference point in the processing stage is appropriately selected, and the reference position is not particularly limited.

In addition, the creation of a seal plate with spacers has been explained as a single item. However, in the actual manufacturing of a seal plate with spacers by pressing, a plurality of dies are placed and the seal plate is molded in units of several tens at once. It is a manufacturing method of a seal plate.

As described above, a spacer having an irregular shape is integrally formed with a screw hole or the like by a burring method, and the spacer is formed to have a flat and uniform thickness so that a fastening load by a fastening screw is received by a seating surface of the spacer. Thus, it is possible to provide a seal plate with a spacer that enables the rubber seal to be arranged by a molding method in which a rubber seal is precisely formed in an arbitrary shape in the vicinity of the irregular shaped spacer.

In addition, the gap between the rubber seal and the mounting surface is adjusted to a uniform and arbitrary height by arbitrarily forming the required height and shape of the spacer, and more than a predetermined tightening allowance where the rubber seal is set Of a seal plate with a spacer by a burring method for forming a spacer that can be prevented from receiving a fastening shaft pressure due to a fastening screw, and a molding method that enables a rubber seal to be formed in the vicinity of the spacer. A manufacturing method can be provided.

As a result, it is possible to provide a method for manufacturing a seal plate with a spacer that can realize a reduction in the size of the seal plate, reduce costs by reducing the number of manufacturing steps, and reduce the number of parts to significantly reduce the number of assembly steps.

DESCRIPTION OF SYMBOLS 1 Seal plate 3 Body main body 4 Opening part 5 Fastening hole 6 Through hole 7 Lid part 8 Fastening screw 9 Rubber seal 10 Seal plate 11 with a spacer 11 Screw hole (corresponding to through hole)
12 Through hole (corresponding to the through hole)
13 Spacer 14 Lower hole 20 Rubber mold

20a Upper mold

20b Lower mold 21 Seal-shaped groove 22 Gate part 23 Injection pipe 25 Recessed part 26 Fixed groove part 27 Frustum part 28 Projection part 31 Mold (for lower hole processing)
32 Mold (for burring)
33 Mold (for burring)
34 Mold (for curling)
35 Mold (for hemming)

Claims

A metal seal plate having a plurality of through holes and spacers formed around the through holes by pressing, and further having a rubber seal formed by molding,
The spacer is formed in a different shape by burring and curling, and has a predetermined height and flatness by hemming,
The seal plate with a spacer, wherein the rubber seal is formed along a seal line adjacent to the spacer by molding using the plurality of through holes as a reference.
A method of manufacturing a metal seal plate having a plurality of through holes and spacers formed around the through holes by pressing, and further having a rubber seal formed by molding,
Forming a plurality of through holes in a predetermined position of the metal plate at the same time through a metal plate with a predetermined outer shape;
Forming a peripheral portion of the through hole into a cylindrical protrusion by burring;
A step of forming an arbitrary irregularly shaped spacer that is folded in the radial direction of the through hole by curling while constraining the cylindrical protrusion, and
Forming the spacer on a spacer seat surface having a predetermined height and flatness by hemming;
Forming a continuous rubber seal along a seal line close to the spacer set in advance on the seal plate by molding based on the plurality of through holes;
The manufacturing method of the sealing plate with a spacer characterized by comprising.
In the curling process, the spacer having an irregular shape is formed by performing a plurality of precision bending processes in which the continuous arbitrary irregular spacer is plastically deformed while changing the shape of the spacer. The manufacturing method of the sealing plate with a spacer of Claim 2.
3. The rubber seal is selected from natural rubber, silicon rubber, acrylic rubber, fluoro rubber, ethylene / propylene rubber, synthetic rubber, thermosetting resin, and thermoplastic elastomer resin. Manufacturing method of seal plate with spacer.