JP2001065697A - Method of forming gasket - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the yield of the rubber material, and to prevent the early deterioration of a board of a gasket due to the high temperature and high pressure by forming a gasket without applying high temperature and high pressure as a rubber vulcanizing condition. SOLUTION: This method of forming a gasket 1 having the predetermined cross section, to which a rope-like rubber seal part 7 is adhered, includes a process for forming a rubber ground 7' to be formed into a rubber seal part 7 into a rope shape, a process for forming the rope-shaped rubber ground 7' into the predetermined cross section, a process for vulcanizing the rubber ground 7' having the predetermined cross section so as to form a rubber seal part 7, and a process for adhering the rubber seal part 7 to the board.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a gasket, which is a kind of a sealing device.

[0002]

2. Description of the Related Art As a type of sealing device, a gasket in which a string-shaped rubber seal portion having a predetermined cross-sectional shape is bonded to the surface of a substrate has been conventionally known. The rubber molding vulcanization method used has the disadvantage that the yield of rubber material is not very good.

Further, since the rubber seal portion is vulcanized and adhered to the substrate at the same time as the vulcanization molding thereof in a state where the substrate is inserted into the product cavity of the rubber molding die, the rubber vulcanization molding is performed at a relatively high temperature and high pressure which is the vulcanization molding condition of rubber. This state acts on the substrate as it is, and as a result, the substrate may deteriorate relatively early.

[0004]

SUMMARY OF THE INVENTION In view of the above, the present invention is capable of improving the yield of a rubber material and applying a high-temperature and high-pressure state, which is a vulcanization molding condition of rubber, to a substrate. It is an object of the present invention to provide a method of forming a gasket, which can form a gasket without the need, and can prevent the substrate from being deteriorated early due to the high temperature and high pressure.

[0005]

To achieve the above object, a method of forming a gasket according to claim 1 of the present invention comprises:
In a method of forming a gasket in which a string-shaped rubber seal portion having a predetermined cross-sectional shape is adhered to a substrate, a step of forming the rubber material to be the rubber seal portion into a string shape, and forming the string-shaped rubber material. Forming a predetermined cross-sectional shape, vulcanizing the rubber material formed into a predetermined cross-sectional shape to form the rubber seal portion, and bonding the rubber seal portion to the substrate. Is what you do.

According to a second aspect of the present invention, there is provided a method of forming a gasket in which a string-shaped rubber seal having a predetermined cross-sectional shape is bonded to a substrate. A step of forming a string-shaped and a predetermined cross-sectional shape, and a step of vulcanizing the rubber material that is a string-shaped and formed into a predetermined cross-sectional shape to form the rubber seal portion; and Bonding to the substrate.

According to a third aspect of the present invention, in the method of forming a gasket in which a string-shaped rubber seal portion having a predetermined cross-sectional shape is adhered to a substrate, the rubber material serving as the rubber seal portion is provided. And vulcanizing it into a product shape before bonding to the substrate.

According to a fourth aspect of the present invention, there is provided a method of forming a gasket in which a string-shaped rubber seal portion having a predetermined cross-sectional shape is adhered to a substrate. Forming the cord into a string shape, forming the cord-shaped rubber cloth into a predetermined cross-sectional shape, attaching the rubber cloth formed into a predetermined cross-sectional shape to the substrate, Heating the applied rubber material under normal pressure and vulcanizing it to form the rubber seal portion.

According to a fifth aspect of the present invention, there is provided a method of forming a gasket in which a string-shaped rubber seal portion having a predetermined cross-sectional shape is bonded to a substrate. Forming a cord into a string and having a predetermined cross-sectional shape; attaching the rubber material having a string shape and having a predetermined cross-sectional shape to the substrate; and attaching the rubber material to the substrate. And vulcanizing by heating under normal pressure to form the rubber seal portion.

According to a sixth aspect of the present invention, in the method of forming a gasket in which a string-shaped rubber seal portion having a predetermined cross-sectional shape is adhered to a substrate, the rubber material to be the rubber seal portion is provided. In a product shape, and then vulcanizing by heating under normal pressure.

Further, according to a gasket molding method according to a seventh aspect of the present invention, in the gasket molding method according to any one of the first to sixth aspects, the rubber material is formed into a string shape to have a predetermined length. The feature is that, when cutting is performed, the end portion is bias-cut.

[0012] As in the molding method according to the first, second or third aspect of the present invention having the above-mentioned steps, when the rubber material to be the rubber seal portion is first formed into a string shape like a product, the string shape is reduced. Since the entire rubber fabric is processed as a product, that is, a rubber seal portion, there is no excess in the material,
Therefore, the yield of the rubber material can be improved. In addition, since this rubber material is made into a product shape and vulcanized alone before bonding to the substrate, it is possible to mold the gasket without applying high temperature and high pressure, which is the vulcanization molding condition of rubber, to the substrate Becomes

Further, as in the molding method according to the fourth, fifth or sixth aspect of the present invention having the above-described steps, when the rubber material to be the rubber seal portion is first formed into a string shape like a product, the string is Since the whole rubber material is processed as a product, that is, a rubber seal portion, there is no excess in the material, so that the yield of the rubber material can be improved. In addition, since this rubber material is adhered to the substrate in the form of a product and then vulcanized by heating under normal pressure, high temperature and high pressure (particularly high pressure), which is the vulcanization molding condition of rubber, is also applied to the substrate. It is possible to form a gasket without the need.

Further, in addition to the above, as in a molding method according to a seventh aspect of the present invention having the above-described steps, a rubber material for forming an endless rubber seal portion is formed into a string shape to have a predetermined length. When the edge is bias-cut at the time of cutting, even if there is some variation in the cutting length, the variation is absorbed by the bias cut, so that necessary sealing properties can be secured.

Incidentally, in common with the molding method according to each claim,
The substrate includes a damping steel plate in which a steel plate and an elastic body such as resin or rubber are laminated. This vibration damping steel plate is particularly suitable for the object of the present invention because its constituent elastic body is relatively weak at high temperatures or high pressures.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will now be described with reference to the drawings. Each of the following embodiments is for forming a gasket 1 shown in FIG. 1, and this gasket 1 is constructed as follows. ing.

First, a damping steel plate 3 as a substrate (also referred to as a base material or a gasket base material) 2 is provided, and a string-shaped rubber seal portion 7 having a predetermined sectional shape is provided on one surface of the damping steel plate 3. Is glued.

The damping steel plate 3 is obtained by sandwiching a resin 6 between two steel plates 4 and 5 and integrating them, and exerts a vibration damping action by the elasticity of the resin 6.
Therefore, the gasket 1 provided with the damping steel plate 3 has a hard disk drive (H
It is suitable for use as a gasket for DD).

The rubber seal portion 7 is formed in a lip shape having a triangular or substantially triangular cross section as shown in the figure to increase the contact surface pressure or the seal surface pressure at the time of mounting. It is provided endlessly in the plane of the substrate 2 so as to surround it.

The gasket 1 having the above structure is formed by the following procedure.

First Embodiment: First, FIG.
As shown in (A), a rubber cloth 7 ′ serving as the rubber seal section 7 is formed into a string shape having an arbitrary cross-sectional shape by using a rubber cloth extruding device 9 such as a flow tester or a capillograph. Cut to length,
Next, as shown in FIGS. 2B and 2C, a rubber material (also referred to as a rubber string or a string-like extruded product) 7 ′ extruded into a string shape is formed into a triangular or substantially triangular cross section using a pressing mold 10. Form into product shape. The initial cross-sectional shape of the rubber material 7 ′ extruded into a cord shape may be any shape such as a circle as shown in the figure.

Next, as shown in FIG. 3C, the rubber material 7 'formed into a product shape is vulcanized by itself using a vulcanizing device or a thermostat (not shown) to form a rubber seal portion 7. . The vulcanization conditions are generally standard, e.g.
5 ° C. for 5 minutes.

Next, as shown in FIG. 3D, the rubber seal portion 7 is adhered to the surface of one steel plate 4 of the damping steel plate 3 by using an adhesive die 11, and the procedure shown in FIG.
As shown in (1), a gasket 1 as a product is formed. At the time of bonding, an adhesive is applied to the bonding surface of the rubber seal portion 7 to perform bonding, and the bonding temperature may be about 100 degrees, which is much lower than the above vulcanization conditions, or 100 degrees or less.

The molding method according to this embodiment has the following features.

That is, first, in order to improve the yield of the rubber material, the rubber cloth 7 ′ is formed in a string shape, and the string-shaped rubber cloth 7 ′ is formed.
100% yield by inserting
Becomes Therefore, the yield of the rubber material can be significantly improved.

Since the resin 6 is deteriorated when the damping steel sheet 3 is simultaneously molded under the usual rubber vulcanization conditions, the string-shaped rubber cloth 7 ′ is pressed by the pressing mold 10 to form a product shape, and the rubber cloth 7 ′ is formed. After vulcanizing only with this, it was decided to adhere it to the damping steel sheet 3 at a relatively low temperature of 100 ° C. or less. Damping steel plate 3
Since the rubber seal portion 7 has already been formed into a product shape at the time of bonding, there is no need to apply a particularly high pressure at the time of bonding. Therefore, the damping steel plate 3 of the rubber seal portion 7
Bonding at relatively low temperature and low pressure,
It is possible to prevent the resin 6 from deteriorating due to high temperature and high pressure. Further, according to this method, the outgas emitted from the rubber material 7 'during vulcanization is also blown away during the vulcanization by the material 7' alone, and is eliminated.

The molding method is particularly suitable for molding a gasket 1 having a rubber lip on a substrate 2 which cannot be vulcanized at high temperature and pressure, such as a vibration damping steel plate 3 or a resin plate alone. .

Second Embodiment First, as shown in FIG. 3 (A), a rubber cloth 7 'to be a rubber seal portion 7 is extruded by a rubber cloth extruder 9 such as a flow tester or a capilograph.
To form a product having a string shape and a triangular or substantially triangular cross section, and cut into a predetermined length required as the rubber seal portion 7. The cross-sectional shape of the rubber material 7 ′ is already a product shape having a triangular cross-section or a substantially triangular cross-section as shown in the figure at the time of extrusion in a string shape.

Next, as shown in FIG. 1B, the rubber material 7 'which is formed in a string shape and is formed into a product shape is vulcanized by using a vulcanizing apparatus or a thermostat (not shown) alone. To form a rubber seal portion 7. The vulcanization conditions are standard, generally for example at 190 ° C. for 5 minutes.

Next, as shown in FIG. 3C, the rubber seal portion 7 is adhered to the surface of one of the steel plates 4 of the damping steel plate 3 by using an adhesive die 11, and the procedure shown in FIG.
As shown in (1), a gasket 1 as a product is formed. At the time of bonding, an adhesive is applied to the bonding surface of the steel plate 4 to perform bonding, and the bonding temperature may be around 100 degrees, which is much lower than the above vulcanization conditions, or 100 degrees or less.

The molding method according to this embodiment has the following features.

That is, first, in order to improve the yield of the rubber material, the rubber material 7 ′ is formed in a string shape and a predetermined product shape, and the rubber material 7 ′ having the string shape and the predetermined product shape is formed into a mold. Yield is 10
0%. Therefore, the yield of the rubber material can be significantly improved.

When the vibration damping steel plate 3 is simultaneously molded under normal rubber vulcanization conditions, the resin 6 is degraded. Therefore, by forming the rubber cloth 7 ′ into a string shape and a predetermined cross-sectional shape, the product shape can be reduced. And vulcanized only with the rubber cloth 7 ′, and then bonded to the damping steel sheet 3 at a relatively low temperature of 100 ° C. or less. At the time of bonding to the damping steel plate 3, the rubber seal portion 7 has already been formed into a product shape, so that it is not necessary to apply a high pressure particularly when bonding. Therefore, since the rubber seal portion 7 is bonded to the vibration damping steel plate 3 at a relatively low temperature and a low pressure, it is possible to prevent the resin 6 from being deteriorated by a high temperature and a high pressure. In addition, according to this method, the outgas emitted from the rubber material 7 ′ at the time of vulcanization is also blown off during the vulcanization by the material 7 ′ alone, and disappears.
It is effective for use places that dislike outgas such as HDD.

The molding method is particularly suitable for molding a gasket 1 having a rubber lip on a substrate 2 which cannot be vulcanized at high temperature and pressure, such as a vibration damping steel plate 3 or a resin plate alone. .

Third Embodiment First, as shown in FIG. 4 (A), a rubber cloth 7 'to be a rubber seal portion 7 is extruded by a rubber cloth extruder 9 such as a flow tester or a capilograph.
Is used to form a cord having an arbitrary cross-sectional shape, cut into a predetermined length required for the rubber seal portion 7, and then, as shown in FIG.
As shown in (C), the rubber material 7 ′ extruded and formed into a string shape is formed into a product having a triangular or substantially triangular cross section by using a pressing die 10. The initial cross-sectional shape of the rubber material 7 ′ extruded into a cord shape may be any shape such as a circle as shown in the figure.

Next, as shown in FIG. 3D, the rubber material 7 ′ formed into a product shape is left unvulcanized and the vibration-damping steel plate 3
And vulcanizing by heating the relatively soft rubber cloth 7 ', which is stuck unvulcanized to the vibration-damping steel sheet 3 in an open state under normal pressure. As a result, the gasket 1 as a product is formed as shown in FIG.

According to the molding method of this embodiment, the yield of the rubber material can be greatly improved. At the same time, the resin 6 of the damping steel plate 3 is subjected to high temperature and high pressure, which is the vulcanization molding condition of rubber. The gasket 1 can be formed without the need.

Fourth embodiment: First, as shown in FIG. 5A, a rubber cloth 7 'to be a rubber seal portion 7 is extruded by a rubber cloth extruder 9 such as a flow tester or a capilograph.
To form a product having a string shape and a triangular or substantially triangular cross section, and cut into a predetermined length required as the rubber seal portion 7. The cross-sectional shape of the rubber material 7 ′ is already a product shape having a triangular cross-section or a substantially triangular cross-section as shown in the figure at the time of extrusion in a string shape.

Next, as shown in FIG. 4B, a rubber material 7 ′ in the form of a string and formed into a product shape is applied to the surface of one steel plate 4 of the damping steel plate 3 in an unvulcanized state. Further, the rubber material 7 'in a relatively soft state, which is stuck unvulcanized to the vibration-damping steel sheet 3, is heated and vulcanized in an open state under normal pressure to form a rubber seal portion 7. Then, the gasket 1 as a product is formed as shown in FIG.

According to the molding method of this embodiment, the yield of the rubber material can be greatly improved, and at the same time, the resin 6 of the vibration damping steel plate 3 is subjected to high temperature and high pressure, which is the vulcanization molding condition of rubber. The gasket 1 can be formed without the need.

Fifth Embodiment First, as shown in FIG. 5A, a rubber material 7 'to be a rubber seal portion 7 is formed into a string having an arbitrary cross-sectional shape by using a rubber extruder 9. The rubber seal 7 (gasket) is cut to a predetermined length required. Next, the extruded string is placed straight in a mold having a predetermined cross-sectional shape, vulcanized at a predetermined temperature for a predetermined time, and vulcanized to form a linear rubber seal portion 7 (linear gasket) having a cross-sectional product shape. I do. Since the obtained rubber seal portion 7 (gasket) is a linear string-shaped rubber seal portion (string-shaped gasket), the linear rubber seal portion 7 can be formed by one mold.
A plurality of (gaskets) can be vulcanized.

As shown in FIG. 6, the obtained linear rubber seal 7 (gasket) is placed along a predetermined position of the damping steel plate 3 with the string-like rubber seal 7 (string-like gasket). Glue. In this embodiment, the step of forming the rubber cloth into a predetermined cross-sectional shape and the step of vulcanizing the formed cloth are performed continuously or almost simultaneously.

The rubber cloth 7 is common to the above embodiments.
When the end is bias-cut when it is formed into a string and cut to a predetermined length, even if there is some variation in the cut length, the bias cut absorbs this variation, so the required sealing performance Can be secured. The bias cut 12 is for diagonally cutting both ends of the string-shaped rubber cloth 7 ′ so as to correspond to each other. As a result, as shown in FIG. 6 or FIG. 7b are formed obliquely so as to correspond to each other.

[0044]

As described above, according to the molding method of the present invention, the yield of the rubber material can be improved, and at the same time, the condition of high temperature and high pressure, which is the vulcanization molding condition of the rubber, can be improved. The gasket can be formed without applying the gasket to the substrate, so that the substrate can be prevented from being deteriorated early due to the high temperature and high pressure.

In addition to the above, according to the molding method of the present invention, when the rubber material is formed into a string and cut into a predetermined length, the end thereof is bias-cut to obtain a cut length. Even if there is some variation, the bias cut absorbs the variation, so that necessary sealing properties can be secured.

[Brief description of the drawings]

1A and 1B are explanatory views of a gasket formed by a forming method according to an embodiment of the present invention, wherein FIG. 1A is a plan view thereof, and FIG. 1B is an enlarged sectional view taken along line AA in FIG.

FIG. 2 is a process explanatory view of a gasket molding method according to a first embodiment of the present invention.

FIG. 3 is a process explanatory view of a gasket molding method according to a second embodiment of the present invention.

FIG. 4 is a process explanatory view of a gasket molding method according to a third embodiment of the present invention.

FIG. 5 is a process explanatory view of a gasket molding method according to a fourth embodiment of the present invention.

FIG. 6 is an explanatory diagram showing an example of a bias cut,
(A) is a plan view of a gasket with a bias cut,
(B) is the front view

FIG. 7 is an explanatory view showing another example of a bias cut, wherein (A) is a plan view of a gasket with a bias cut,
(B) is the front view

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Gasket 2 Substrate 3 Damping steel plate 4, 5 Steel plate 6 Resin 7 Rubber seal part 7 'Rubber cloth 7a, 7b Opposite end part 8 Fluid passage part 9 Rubber cloth extrusion device 10 Push type 11 Adhesive type 12 Bias cut

[Procedure amendment]

[Submission date] September 8, 1999 (1999.9.8)

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] All figures

[Correction method] Change

[Correction contents]

FIG.

FIG. 2

FIG. 3

FIG. 4

FIG. 5

FIG. 6

FIG. 7

Claims (7)

[Claims] 1. A gasket (1) in which a string-shaped rubber seal portion (7) having a predetermined cross-sectional shape is adhered to a substrate (2).
A step of forming the rubber cloth (7 ′) to be the rubber seal portion (7) into a string shape; and a step of forming the rubber cloth (7 ′) formed into a string shape into a predetermined cross-sectional shape. A step of vulcanizing the rubber cloth (7 ′) formed into a predetermined cross-sectional shape to form the rubber seal section (7); and a step of bonding the rubber seal section (7) to the substrate (2). A method for forming a gasket, comprising: 2. A gasket (1) in which a string-shaped rubber seal (7) having a predetermined cross-sectional shape is bonded to a substrate (2).
Forming a rubber material (7 ') to be the rubber seal portion (7) in a string shape and a predetermined cross-sectional shape; and forming the rubber material (7') in a string shape and a predetermined cross-sectional shape. A step of vulcanizing said rubber material (7 ') to form said rubber seal portion (7); and a step of bonding said rubber seal portion (7) to said substrate (2). Method. 3. A gasket (1) in which a string-shaped rubber seal (7) having a predetermined cross-sectional shape is adhered to a substrate (2).
A method of molding a gasket, comprising: vulcanizing a rubber material (7 ′) serving as the rubber seal portion (7) into a product shape and then bonding the product to the substrate (2). 4. A gasket (1) in which a string-shaped rubber seal portion (7) having a predetermined sectional shape is adhered to a substrate (2).
A step of forming the rubber cloth (7 ′) to be the rubber seal portion (7) into a string shape; and a step of forming the rubber cloth (7 ′) formed into a string shape into a predetermined cross-sectional shape. Bonding the rubber cloth (7 ′) formed into a predetermined cross-sectional shape to the substrate (2); and heating the rubber cloth (7 ′) bonded to the substrate (2) under normal pressure. By vulcanizing the rubber seal part (7)
A method of forming a gasket, comprising the steps of: 5. A gasket (1) in which a string-shaped rubber seal portion (7) having a predetermined sectional shape is adhered to a substrate (2).
Forming a rubber material (7 ') to be the rubber seal portion (7) in a string shape and a predetermined cross-sectional shape; and forming the rubber material (7') in a string shape and a predetermined cross-sectional shape. Attaching the rubber material (7 ') to the substrate (2); and heating and vulcanizing the rubber material (7') attached to the substrate (2) under normal pressure to form the rubber seal portion ( 7)
A method of forming a gasket, comprising the steps of: 6. A gasket (1) in which a string-shaped rubber seal portion (7) having a predetermined sectional shape is adhered to a substrate (2).
A method of molding a gasket, characterized in that a rubber material (7 ') serving as the rubber seal portion (7) is adhered to the substrate (2) as a product shape and then heated under normal pressure and vulcanized. Molding method. 7. The method for forming a gasket (1) according to claim 1, wherein the rubber material (7 ′) is formed into a string and cut into a predetermined length. A method for forming a gasket, comprising bias cutting a part.