JPH058248A - Insert molded article and manufacture and mold thereof - Google Patents

Abstract

PURPOSE:To provide an insert molded article having a shape, by which molding material is prevented from running out to the outer periphery side of the annular bent part at the outer periphery of an insert member such as metal ring or the like. CONSTITUTION:In the insert molded article concerned, the edge face 9 of molding material part 7 bonding to the inner periphery side of a metal ring 3 is made to slope from the tip of an annular bent part 5 radially inward so as to gradually get close to the main body part 4 side of the metal ring so as to close a mold under the condition that the comonent force of mold closing pressure acts to the annular bent part 5 to open it in order to seal the contact surface between the annular bent part 5 and the inner periphery of an annular wall 16 by pressing the tip of the annular bent part 5 against the inner periphery of the annular wall 16 of a first mold 12, resulting in preventing molding material from running out to the outer peripheral surface 6 side of the annular bent part 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to various insert molded products such as oil seals, a method of manufacturing the same, and a molding die.

[0002]

2. Description of the Related Art As a conventional insert molded product, there is an oil seal 100 as shown in FIG. 5, for example. The oil seal 100 is a so-called outer peripheral metal type, and is constructed by embedding a metal ring 102 as an insert member in a molded product body 101 to be molded. , This metal ring body 1
It is constituted by an annular bent portion 104 which is bent from the outer periphery of 03 in a tubular shape substantially at right angles to the metal ring main body portion 103. Then, the molded product main body 101 is joined only to the inner peripheral surface side of the outer peripheral surface and the inner peripheral surface of the annular bent portion 104 so that the metal surface is exposed on the outer peripheral surface 105. The end surface 107 of the molded product body 101 joined to the inner peripheral surface of the annular bent portion 104 is flush with the tip surface 108 of the annular bent portion 104.

The oil seal 100 is molded by opening a pair of molds 109 and 110 which can be opened and closed to each other, and a metal ring body 103 is mounted on a mounting surface 111 provided in one of the first molds 109. Is mounted, the outer circumference of the annular bending portion 104 on the outer circumference of the metal ring 102 is fitted to the inner circumference of the annular wall 112, and then the mold is closed to bring the second mold 110 into close contact with the tip of the annular bending portion 104 of the metal ring 102. Then, the outer peripheral surface 10 of the metal ring 102
5 to prevent the molding material from rotating,
4 was filled with the molding material 113, heated under pressure, and molded into a predetermined shape.

[0004]

However, in the case of the above-mentioned prior art, the end surface 1 of the molded product body 101 joined to the distal end surface 108 of the annular bent portion and the inner circumference of the annular bent portion 104.
07 are flush with each other, and the end surface 114 of the annular wall 112 of the first mold 109 and the second surface of the first mold 109, which are in contact with each other when the mold is closed.
Tip surface 10 of the annular bending portion of the metal ring 102 of the mold 110
Since the close end face 115 that is in close contact with 8 is flush, the metal ring 1
There was a problem that the molding material leaked easily because a gap was formed in the close contact portion due to the variation in the width dimension of the annular bent portion 104 of No. 02 and the waviness in the circumferential direction. Therefore, a post-process such as burr removal is required, and there is a problem that productivity is poor.

The joint surface of the metal ring body 103 with the mounting surface 111 is arbitrary between the inner diameter end and the outer diameter end of the metal ring body 103 as shown in FIG. Because of the large size, the leakage of the molding material on the mounting surface 111 side of the metal ring 102 does not occur.

The present invention has been made to solve the above-mentioned problems of the prior art. The object of the present invention is to prevent the molding material from wrapping around the outer periphery of the annular bending portion of the outer periphery of the insert member such as a metal ring. An object of the present invention is to provide an insert-molded product having a possible shape, a method for manufacturing the same, and a molding die.

[0007]

In order to achieve the above object, in the present invention, an insert member is embedded in a molded product body to be molded, and the insert member is an insert. A main body and an annular bent portion that is bent from the outer circumference of the insert main body into a tubular shape at substantially right angles to the insert main body. In an insert molded product in which only the molded product body is joined, the end surface of the molded product body is
It is characterized in that it is an inclined surface that is gradually inclined inward from the tip of the annular bent portion inward in the radial direction toward the insert body portion side.

Further, an insert member composed of an insert main body portion and an annular bent portion which is bent from the outer periphery of the insert main body portion into a tubular shape substantially at right angles to the insert main body portion is prepared, and a pair of openable and closable members are provided. The mold is opened, the insert body is placed on the placement surface provided in one of the first molds, and the outer circumference of the annular bending portion is fitted to the inner circumference of the annular wall. Insert molding in which the mold is closed and the second mold is brought into close contact with the tip of the annular bent portion on the outer periphery of the insert member to fill the inner peripheral side of the annular bent portion of the insert member with a molding material to form an insert molded article of a predetermined shape. In the method of manufacturing a product, when the mold is closed, the component force of the mold closing pressure is applied in the opening direction of the annular bending portion to close the die, and the tip of the annular bending portion is pressed against the inner circumference of the annular wall of the first die to form an annular bending. Section and inner circumference of the annular wall To characterized in that sealing between.

Further, the first member into which the insert member is inserted
And a second mold for closing the mold with respect to the first mold to form a cavity having a predetermined shape between the mating surfaces, and the first mold is provided with an insert member. A mounting surface for mounting and an annular wall with which the outer periphery of the mounted insert member outer peripheral bent portion is fitted are provided, and the second mold is provided at the tip of the annular bent portion of the insert member during molding. In a molding die having a close contact end surface, the second mold has a close end surface which is an inclined surface which is inclined in a direction in which it gradually projects inward in the radial direction.

[0010]

In the insert-molded product having the above-described structure, the end surface of the molded-product body is an inclined surface that is gradually inclined inward from the tip of the annular bending portion toward the insert body. Therefore, due to this inclined surface, the component force of the mold closing pressure acts in the direction in which the annular bending portion opens when the mold is closed, and the contact surface pressure between the tip of the annular bending portion and the inner circumference of the annular wall of the first die is increased. As a result, the molding material is prevented from wrapping around to the outer peripheral side of the annular bent portion.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on the illustrated embodiments. FIG. 1 shows an oil seal 1 as an insert molded product according to one embodiment of the present invention, which is generally configured by embedding a metal ring 3 as an insert member in a molded product main body 2 to be molded. To be done. This metal ring 3 has a cross section L
A washer-shaped metal ring body 4 with a ring-shaped member
And an annular bending portion 5 which is bent from the outer circumference of the metal ring body 4 into a tubular shape substantially at right angles to the metal ring body 4. The molded product body 1 is joined only to the inner peripheral surface side of the outer peripheral surface 6 and the inner peripheral surface of the annular bent portion 5.

The molded product body 2 has a substantially rectangular cross section, and the outer peripheral surface thereof is integrally baked and fixed to the inner periphery of the annular bent portion 5, and one end surface thereof is integrally fixed to the end surface of the metal ring main body portion 4 by baking. A seal lip 8 is formed on the inner circumference of the molded product body 2.

The end surface 9 on the tip side of the annular bending portion 5 of the molded body 2 gradually inclines inward in the radial direction from the tip surface 10 of the annular bending portion 5 toward the metal ring body portion 4 side. It is an inclined surface. In this embodiment, there is a step difference of about 0.1 to 0.15 [mm] between the tip end surface 10 of the annular bent portion 5 of the metal ring 3 and the inner diameter end position of the end surface 9 of the molded product body 2. It is as a shape.

2 to 4 show a mold for molding the oil seal. That is, the molding die 11 includes a first die 12 into which the metal ring 3 is inserted, and a first die 12 that closes the first die 12 to form a cavity 13 having a predetermined shape between mating surfaces. And two dies 14, respectively. A mounting surface 15 for mounting the metal ring 3 on the first die 12, and an annular bending portion 5 of the mounted metal ring 3
An annular wall 16 is provided to which the outer periphery fits. Further, the second mold 14 is provided with a close end face 17 which comes into close contact with the tip of the annular bent portion 5 of the metal ring 3 when the mold is closed.

The contact end surface 17 of the second mold 14 is an inclined surface that is inclined in a direction that gradually projects inward in the radial direction.

Next, a method of molding the oil seal 1 using the molding die 11 will be described.

First, the metal ring body 4 is placed on the placing surface 15 provided in the first die 12 on one side, and the metal ring 3 is placed.
The annular bent portion 5 is fitted to the inner circumference of the annular wall 16 of the first mold 12. After that, the mold is closed and the second mold 14 is brought into close contact with the tip of the annular bent portion 5 on the outer circumference of the metal ring 3, and the molding material 18 is filled into the inner peripheral side of the annular bent portion 5 of the metal ring 3 to have a predetermined shape. Mold the oil seal of.

When the molding die 11 is closed, the close-contact end surface 17 of the second die 14 gradually protrudes inward in the radial direction from the tip of the annular bending portion 5 and approaches the first die 12. Since the inclined surface is inclined in the direction, the component force of the mold closing pressure acts in the direction in which the tip of the annular bending portion 5 opens when the mold is closed, and the tip end of the annular bending portion 5 and the first mold are closed. The contact surface pressure of 12 with the inner circumference of the annular wall 16 increases, and the wraparound of the molding material toward the outer peripheral surface 6 of the annular bent portion 5 is prevented.

In this embodiment, the oil seal is used as an example of the insert molded product, but the present invention is not limited to the oil seal, but can be applied to various insert molded products in which an insert member is embedded in the molded product body. .

[0020]

EFFECTS OF THE INVENTION The present invention has the above-mentioned structure and action, and the end surface of the molded product body is gradually inclined inward in the radial direction from the tip of the annular bending portion toward the insert body portion. Since it is an inclined surface, the component force of the mold closing pressure can be applied to the opening direction of the annular bending portion when the mold is closed by this inclined surface, and the tip of the annular bending portion comes into contact with the inner circumference of the annular wall of the first die. It is possible to prevent the molding material from wrapping around to the outer peripheral side of the annular bending portion due to an increase in surface pressure, and it is possible to reduce molding defects.

Further, since it is possible to reduce the flash removing step that wraps around the outer circumference of the annular bending portion as in the conventional case, it is possible to reduce the number of molding steps and improve workability and productivity.

[Brief description of drawings]

[0022]

FIG. 1 is a longitudinal sectional view of an essential part of an oil seal as an insert-molded product according to an embodiment of the present invention.

[0023]

2 is a semi-longitudinal sectional view of a mold for molding the oil seal of FIG. 1 in a mold open state.

[0024]

FIG. 3 is a vertical cross-sectional view of the molding die of FIG. 2 during a molding process.

[0025]

FIG. 4 is a semi-longitudinal sectional view of the molding die of FIG. 3 in a completed state.

[0026]

FIG. 5 is a sectional view of an essential part of an oil seal as a conventional insert-molded product.

[0027]

FIG. 6 is a longitudinal cross-sectional view of an essential part of the metal ring of FIG. 5 before forming.

[0028]

FIG. 7 is a semi-longitudinal sectional view of a mold opening state of a molding die for molding the conventional oil seal of FIG.

[0029]

8 is a semi-longitudinal cross-sectional view of the molding die of FIG. 7 during molding.

[0030]

9 is a semi-longitudinal sectional view of the molding die of FIG. 7 in a completed state.

[0031]

[Explanation of symbols]

1 Oil seal (insert molded product) 2 Molded product body 3 Metal ring (insert member) 4 Metal ring body 5 annular bend 6 outer peripheral surface 8 seal lip 9 Molded product end face 10 End of annular bending part 11 Mold 12 First mold 13 cavities 14 Second mold 15 Placement surface 16 Ring wall 17 Close end face 18 Molding material

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] July 1, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0021

[Correction method] Change

[Correction content]

Further, since the flash removing step that wraps around the outer circumference of the annular bending portion as in the conventional case can be eliminated, the number of molding steps can be eliminated and the workability and the productivity can be improved.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] Brief description of the drawing

[Correction method] Change

[Correction content]

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of an essential part of an oil seal as an insert-molded product according to an embodiment of the present invention.

FIG. 2 is a semi-longitudinal sectional view of a mold opening state of a mold for molding the oil seal of FIG.

FIG. 3 is a vertical cross-sectional view of the molding die of FIG. 2 during a molding process.

4 is a semi-longitudinal sectional view of the molding die of FIG. 3 in a completed state of molding.

FIG. 5 is a sectional view of a main part of an oil seal as a conventional insert-molded product.

FIG. 6 is a longitudinal sectional view of an essential part of the metal ring of FIG. 5 before forming.

FIG. 7 is a semi-longitudinal sectional view of a mold opening state of a molding die for molding the conventional oil seal of FIG.

FIG. 8 is a semi-longitudinal sectional view of the molding die of FIG. 7 during a molding process.

9 is a semi-longitudinal sectional view of the molding die of FIG. 7 in a completed state.

[Explanation of symbols] 1 Oil seal (insert molded product) 2 Molded product body 3 Metal ring (insert member) 4 Metal ring body 5 annular bend 6 outer peripheral surface 8 seal lip 9 Molded product end face 10 End of annular bending part 11 Mold 12 First mold 13 cavities 14 Second mold 15 Placement surface 16 Ring wall 17 Close end face 18 Molding material

Claims (3)

[Claims] 1. An insert member is embedded in a molded product main body to be molded, and the insert member is an insert main body, and the insert main body is substantially perpendicular to the insert main body. An insert-molded article, which is formed by an annular bent portion that is bent into a tubular shape, and in which the molded article body is joined only to the inner peripheral surface side of the outer peripheral surface and the inner peripheral surface of the annular bent portion, the end surface of the molded article body Is an inclined surface that gradually inclines inward in the radial direction from the tip of the annular bent portion toward the insert body portion side. 2. An insert member comprising an insert body and an annular bent portion that is bent from an outer periphery of the insert body into a tubular shape substantially at a right angle to the insert body. Open the mold of
The insert body is placed on the placement surface provided in the first mold on one side, and the outer circumference of the annular bending portion is fitted to the annular wall,
After that, the second mold is closed, the second mold is brought into close contact with the tip of the annular bending portion on the outer periphery of the insert member, and the molding material is filled into the inner peripheral side of the annular bending portion of the insert member to form an insert molded product having a predetermined shape. In the method for manufacturing an insert-molded product, the mold is closed while the component force of the mold closing pressure is applied in the direction in which the annular bending portion opens when the mold is closed, and the tip of the annular bending portion is brought into contact with the inner circumference of the annular wall of the first die. A method for manufacturing an insert-molded product, comprising pressing to seal between the contact surfaces of the annular bent portion and the inner circumference of the annular wall. 3. A first mold into which an insert member is inserted, and a second mold which closes the first mold to form a cavity having a predetermined shape between mating surfaces. The first mold is provided with a mounting surface for mounting the insert member and an annular wall with which the outer circumference of the annular bend portion of the outer periphery of the mounted insert member is fitted, and the second mold is provided. Is a molding in which a close end surface is provided that is in close contact with the tip of the annular bending portion of the insert member when the mold is closed, and an inclined surface that inclines in a direction in which the close end surface of the second mold gradually projects radially inward. A molding die characterized by: