JP2000006266A - Manufacture of sealing member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a sealing member excellent in a thermal efficiency and capable of being molded consecutively and in less time in order to form a sealing member made of a thermoplastic resin at a high speed and in large quantities. SOLUTION: After a round pan 4 is punched out of a plate member made of metal and a thermoplastic resin 2 is then filled into the interior, a mold is pressed and the thermoplastic resin layer is formed in the interior, while being overflowed to the outer peripheral portion, so as to form a lip. The punch of the middle portion of this round pan 4 forms a sealing member. Thereby a lower mold can be eliminated, and provides extreme efficiency in the molding property and priority in the heating efficiency.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for molding a sealing material made of a thermoplastic resin at a high speed in a large amount.

[0002]

2. Description of the Related Art Conventionally, when a sealing material is formed of a thermoplastic resin, upper and lower dies having cavities engraved in the shape of the sealing material are used, and if an insert material is required, it is melted together with the insert material. The molded thermoplastic resin material is put into the cavity to form a mold, and then cooled and taken out from the cavity to obtain a sealing material having a desired shape,
In the molding method using the upper and lower dies for such molding, it is easy to continuously form a large amount, such as the need for complicated procedures such as opening and closing the upper and lower dies, heating and cooling. It has a configuration that cannot be done.

[0003] Recently, with reference to the drawings, as shown in FIG.
Are successively transported, and the thermoplastic resin (2) is quantitatively supplied into the heated lower mold (1). The supplied thermoplastic resin (2) is supplied to the lower mold (1). And an upper mold (3) opposed to the lower mold (1), and a continuous manufacturing method of cooling and removing the mold from the upper mold (3) is invented. (Japanese Patent Publication No. 03-050690) In this production method, the production efficiency is improved by continuously producing the sealing material (S), and the heating device for the lower mold (1) does not repeat the operation and stop, so that the heat is not generated. It has the advantage of being economically advantageous.

[0004]

However, a continuous molding method in which the sealing material (S) is formed through each step while transporting the upper and lower dies (1, 2) as described above involves a step of sequentially transporting. Except for the difference between the conventional molding method and the conventional molding method, the production of precise upper and lower molds (1 and 2) and heating of the upper and lower molds (1 and 2) are disadvantages of the conventional method. -It has many difficulties in cooling, opening and closing and transporting the upper and lower dies (1, 2). That is, upper and lower molds (1,
In 2), not only the molding cost is increased, but also the maintenance and inspection cost is not in a negligible range, and the upper and lower dies (1, 2) are not required.
In this case, the heat storage capacity naturally increased, and much time and cost were required for heating and cooling. Opening and closing of the upper and lower molds (1, 2) is performed by an insert material (not shown).
This is an indispensable step for charging the mold or taking out the sealing material (S) which is a molded product. In this step of opening and closing the upper and lower dies, shortening of molding time cannot be expected. The present invention has been made in view of such a drawback, and an object of the present invention is to provide a method of manufacturing a sealing material which has excellent thermal efficiency and can be molded continuously and in a short time.

[0005]

The present invention will be described with reference to the drawings. As shown in FIG. 1, a round plate (4) having a rising portion (4a) on its outer periphery is stamped and formed from a metal plate. An adhesive is applied to this, and as shown in FIG. 2, a predetermined amount of the thermoplastic resin (2) in a molten state is filled into the inside of the round plate (4) which has been preheated by high frequency heating or the like. As shown in FIG. 3, a low-temperature (normal temperature) mold (5) is pressed against the inside of the round plate (4) to apply pressure, thereby forming a thermoplastic resin layer (2a) with an appropriate thickness inside the round mold (5). The resin (2) overflows to the outer periphery of the rising portion (4a) to form a lip (2b). Then, the sealing material (S1) is formed by removing the mold and punching the center of the round plate (4) together with the thermoplastic resin layer (2a) into a circle as shown in FIG.

When a round plate (4) having a rising portion (4a) on the outer periphery is punched and formed from the metal plate material, an annular concave and convex portion is formed in the center of the round plate (4) as shown in FIG. (4b) is press-formed at the same time, a thermoplastic resin layer (2a) is formed thereon by the same method as described above, and then the center of the round plate (4) is rounded together with the thermoplastic resin layer (2a). It is characterized by being formed by punching.

When the round plate (4) is stamped and formed, a rising portion (4) formed on the outer periphery as shown in FIG.
A feature is that a radial flange portion (4c) is formed on the periphery of a). Further, when the center portion of the round plate (4) is stamped and formed, as shown in FIG. 8, an extended lip (2c) formed by overflowing to the outer peripheral portion is simultaneously punched and formed to a desired size.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention has developed and implemented a simple manufacturing method of a sealing material (S1) as described above, and a single metal plate material is provided with a dish-shaped rising portion (4a). The thermoplastic resin layer (2a) is formed by punching to form a formed round plate (4). A lip (2b) made of a thermoplastic synthetic resin that overflows to the outer peripheral portion of the rising portion (4a) by pressure is formed. In this lip shape, the flange portion (4
The extension lip (2c) projecting from c) is punched into a desired shape to form a sealing material (S1). When the sealing material (S1) formed as described above is mounted by press-fitting the lip (2b) to a relatively rotating portion such as a bearing (8) as shown in FIG. 5, the elastic action is sufficient. Shows high sealing performance and adhesion with good adhesion.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with reference to an embodiment. An adhesive is applied to a round plate (4) formed as shown in FIG.
This is heated while being sequentially conveyed one by one, and a fixed amount of the thermoplastic resin (2) is supplied to the heated round plate (4) as shown in FIG. As shown in the figure, the mold (5) is pressed from above to press the rising part (4).
The thermoplastic resin (2) is formed so as to form a lip (2b) that overflows and protrudes to the outer peripheral portion of (a). In the formation of the extension lip (2c) in the case where the flange portion (4c) is formed on the rising portion (4a), a forming die (5) having a radially expanding surface is prepared as shown in FIG. An extending lip (2c) is pressed from above the thermoplastic resin (2) supplied to the fixed amount by the molding die (5) and overflows, and protrudes radially between a lower transfer member or a receiving tray or the like. Is formed. Next, the mold is removed from the mold (5), and the center portion of the round plate (4) thus formed is punched into a circle having a desired size as shown in FIG. 4 or 8 to form a sealing material (S1). I do.

When the center portion is formed by punching, the thermoplastic resin layer (2a) is punched while generating elastic deformation by adjusting the pressure of the presser plate (7) and the pressure of the cut punch (6). A lip shape in which the periphery of the cut surface of the thermoplastic resin layer (2a) is somewhat protruded from the periphery of the cut surface of the round plate (4) can be formed. In addition,
The extension lip (2) formed in the edge direction of the flange portion (4c)
In the punching molding of c), as shown in FIG. 8, when the center portion of the round plate (4) is punched, the sealing material is formed by punching simultaneously by the same method, and has a radially projecting extension lip (2c). S1) is formed.

The sealing material (S) formed as described above
When the lip (2b) is press-fitted onto a relatively rotating part such as the bearing (8) as shown in FIG. Shows the strength. Further, in the sealing material (S1) having the extension lip (2c) formed on the edge of the flange portion (4c), the extension lip (2) protruding in the radial direction as shown in FIG.
When c) is mounted so as to enclose the flange portion (4c), a strong sealing action is produced and the danger of falling off can be eliminated, resulting in a preferable mounting structure.

The sealing material (S) formed as described above
When 1) is mounted on the bearing (8), as shown in FIGS. 5 and 9, between the rising portion (4a) having a rigid cylindrical shape or the flange portion (4c) and the bearing (here, the outer ring 8a). The lip (2b, 2c) having high elasticity is interposed and compression-fitted, so that the mounting portion is completely sealed and fixed.

In the formation of the round plate (4), the central portion of the round plate (4) as shown in FIG. 6 is changed from a simple plate shape as shown in FIG. It is also possible to form a flange portion (4c) on the periphery of the rising portion (4a) as shown in FIGS. 7 and 8 with the shape to be shaped. The mounting space has many advantages and does not add any small working disadvantages.

Next, the thermoplastic resin (2) is selected from polystyrene, polydiolefin, chlorine and engineering plastics. This thermoplastic resin (2) is easily brought into a fluid state by appropriate heating, does not require a vulcanization step, is filled into a round plate (4) and is filled with a thermoplastic resin layer in a molding die (5). There is no worrying factor in the modeling of (2a). Further, the thermoplastic resin (2) has the same or higher strength characteristics as the reinforced vulcanized rubber without adding a reinforcing agent, and is made of a material suitable for a bearing seal that slides and seals. Has become. In addition, round plate (4)
The residual heat is applied to soften the adhesive applied and formed on the inner surface of the thermoplastic resin (2) in order to enhance the adhesiveness with the thermoplastic resin (2) to be melt-filled, and the thermoplastic resin (2) is charged. Is made to be compatible with each other and firmly adhere.

[0015]

According to the above configuration, the following excellent effects can be obtained. In the present invention, the round mold (4) replaces the lower mold, which is indispensable for the molding, so that it can be omitted, whereby the formability is extremely efficient and the heating efficiency is greatly improved. The ability to easily fill, mold, and punch in this way enables a molding cycle in an extremely short time, and because remolding is easy and excellent in recyclability, production energy and production costs are reduced, and inexpensive and large Can be provided.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an initial step of the present invention.

FIG. 2 is a sectional view showing a material filling step of the present invention.

FIG. 3 is a sectional view showing a mold forming step of the present invention.

FIG. 4 is a sectional view showing a cutting step of the present invention.

FIG. 5 is a sectional view showing a state where the present invention is mounted.

FIG. 6 is a sectional view showing another embodiment of the present invention.

FIG. 7 is a sectional view showing another molding example of the present invention.

FIG. 8 is a sectional view showing another cut example of the present invention.

FIG. 9 is a cross-sectional view showing another mounting example of the present invention.

FIG. 10 is a sectional view showing a conventional example not using the present invention.

[Explanation of symbols]

 S Sealing material S1 Sealing material 1 Lower mold 2 Thermoplastic resin 2a Thermoplastic resin layer 2b Lip 2c Extension lip 3 Upper mold 4 Round plate 4a Rising part 4b Irregular part 4c Flange part 5 Mold 6 Cutting punch 7 Pressing plate 8 Bearing 8a Outer ring

Claims (4)

[Claims] 1. A round plate having a rising portion on the outer periphery is punched out of a metal plate material, and an appropriate amount of thermoplastic resin is filled in a molten state into the round plate which has been coated with an adhesive and is preheated. A resin mold is formed by pushing a molding die into the mold, and the thermoplastic resin overflows to the outer peripheral portion of the rising portion to form a lip.After removing the mold, the lip is formed together with the synthetic resin layer. A method for producing a sealing material, wherein a center portion of a plate is punched out in a circular shape. 2. The sealing material according to claim 1, wherein when a round plate having a rising portion on the outer periphery is punched and formed from said metal plate material, an annular concave and convex portion is provided at the center of said round plate. Manufacturing method. 3. The method for manufacturing a sealing material according to claim 1, wherein when the round plate is formed by punching, a flange portion is formed on a peripheral edge of a rising portion formed on the outer periphery. 4. When punching and forming the center of the round plate,
4. The method for manufacturing a sealing material according to claim 1, wherein a lip formed by overflowing to an outer peripheral portion is punched and formed.