JP2001150483A - Composite molding method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a composite molding method which can mold a composite member in which a soft member and a hard member are integrated by compos ite molding, with the surface of the hard member prevented from being hurt and the appearance of a product formed beautifully, and prevent the generation of burrs in the joint between the soft member and the hard member in an injec tion process. SOLUTION: In a primary molding process for injection-molding the first member (fitting part 3) made of a soft material, the first member 3 is molded in a shape to have a groove 4 which forms a clearance between it and the second member 2 in a prescribed range on the peripheral side of the joint opposite to the second member (base 2) of the first member 3. In a secondary molding process in which, with the first member 3 held in secondary molding die 21, 22, the second member 2 of a hard material is injection-molded to be combined with the first member 3, with the use of a die 22 having a projection part 22-a in a shape corresponding to the groove 4, with the projection part 22-a inserted into the groove 4 of the first member 3, the second member 2 is injection-molded.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite molding method for molding a composite member by combining a first member made of a soft material and a second member made of a hard material.

[0002]

2. Description of the Related Art Conventionally, when a composite member obtained by combining a soft member and a hard member into a single body has a shape that is difficult to form in a complex manner, each member is separately formed and each member is formed. They have been used in combination by bonding or bonding.

For example, in the case of a mounting structure for a door mirror of a vehicle, as shown in FIG. 3, a mounting structure 91 includes a base 92 made of a hard material to which the mirror is mounted, and the base 92 is mounted on a vehicle body. Waterproof, dustproof,
It is composed of a seal rubber 93 and a butyl tape 94, which are soft materials that play a role of damping vibration and preventing peeling of the painted surface. Specifically, a butyl tape 94 is attached to the outer periphery of the mounting surface of the base 92.
PVC (polyvinyl chloride), E
PDM (Ethylene-propylene-diene terpolymer)
The seal rubber 93 made of the above is assembled to the base 92, and the mounting structure 91 of the door mirror is attached to the vehicle body via the seal rubber 93.

[0004] Further, for specific applications, a composite member obtained by integrally molding a soft member and a hard member is manufactured and partially used, but at present it has not been widely used.

[0005]

In the case where the above-mentioned soft member and hard member are separately formed, and each member is joined by fitting or bonding and used in combination, the man-hours for preparation and assembly are reduced. However, there is a problem that extra is required.

In addition, when a composite member obtained by integrally molding a soft member and a hard member is manufactured by injection molding, the hard member is first molded first, and the soft member is compounded with the hard member. When the next molding method is adopted, the soft member is
There is a problem that the surface of the hard member is scratched by the mold at the time of mold clamping for the next molding, resulting in a poor appearance of the product.

Conversely, in the case where the soft member is first molded first, and the soft member is combined with the hard member to form the second member, the soft member is combined with the soft member in the mold clamping step of the second member. In the vicinity of the joint with the hard member to be formed by molding, the tip of the soft member falls down toward the hard member, causing a problem that burrs are generated in a subsequent injection step.

The present invention has been made to solve the problems of the prior art, and can prevent the surface of the hard member from being damaged by combining and forming a soft member and a hard member. It is an object of the present invention to provide a composite molding method capable of molding a product in a good appearance and preventing burrs from being generated at a joint between a soft member and a hard member in an injection step. .

[0009]

SUMMARY OF THE INVENTION The present invention relates to a composite molding method for molding a composite member by combining a first member made of a soft material and a second member made of a hard material into an integrated composite member.
A primary molding step of injection-molding the member, and a secondary molding step of injection-molding the second member and compounding the first member with the first member while holding the first member in a secondary molding die. In the primary forming step, the first member is formed into a shape having a groove that forms a gap between the first member and the second member only in a predetermined range on the outer peripheral side of the joining portion with the second member. One member is molded, and
In the next molding step, the second member is injection-molded in a state where the protrusion is inserted into the groove of the first member using a mold having a protrusion having a shape corresponding to the groove. I do.

[0010] According to the above configuration, the groove is formed in the first member made of a soft material in the primary molding step, and the shape corresponding to the groove is formed in the mold clamping step of the secondary molding. Since the second member is injection-molded in a state where the protrusion of the mold is inserted into the groove of the first member by using a mold having a protrusion, the tip of the first member is on the second member side. Is prevented by the protruding portion, so that burrs do not occur at the joint between the soft member and the hard member in the subsequent injection step.

In addition, since a method is employed in which a soft member is first formed first, and a soft member is combined with a hard member to form a second member, a hard member, which is another conventional method, is first formed first. The surface of the hard member is scratched by the mold at the time of mold clamping for the secondary molding of the soft member, which has occurred when the soft member is combined with the soft member for the secondary molding, resulting in poor appearance of the product. Can also be solved.

In the composite molding method according to the present invention, the composite member is a door mirror mounting structure including a mirror mounting base made of a hard material, and a mounting portion made of a soft material and provided on a peripheral portion of the base. It is suitable when one member is the attachment portion and the second member is the base.

[0013]

Embodiments of the present invention will be specifically described below with reference to the drawings.

FIG. 1 shows a mounting structure of a vehicle door mirror as an example of a composite member in which a soft member and a hard member are composite-molded and integrated by the composite molding method of the present invention. This mounting structure 1 is, as shown in FIG.
It comprises a base 2 made of a hard material to which a mirror is attached, and an attachment portion 3 made of a soft material such as PVC or EPDM integrated with the outer periphery of the attachment surface of the base 2 by composite molding, and attached to the vehicle body. At this time, this mounting part 3
Plays a role of waterproofing, dustproofing, vibration proofing, and preventing peeling of the painted surface.

FIG. 1B is a diagram showing the PP of FIG. 1A.
The mounting structure 1 has a groove 4 that forms a gap between the base 2 and the mounting portion 3 made of a soft material on the outer peripheral side of a joining portion of the mounting portion 3 made of a soft material with the base 2 made of a hard material. Shape.

FIG. 2 shows an example of a composite molding method of the present invention, in which a first member made of a soft material and a second member made of a hard material are combined to form an integrated composite member. The case of the door mirror mounting structure 1 shown in FIG.

According to the composite molding method of the present invention, a primary molding step of injection-molding a mounting portion 3 made of a soft material,
The base 2 made of a hard material is injection-molded in a state where the base 2 is held in the next molding dies 21 and 22 and is combined with the mounting portion 3 2.
And a next molding step.

In the primary molding step using the mold 11 and the mold 12, the base 2 made of a hard material of the mounting portion 3 made of a soft material is used.
The mounting portion 3 is formed in a shape having a groove 4 forming a gap between the base 2 and the base 2 within a predetermined range on the outer peripheral side of the joint portion with respect to the mounting portion 3. Here, as shown in FIG. 2, the outer boundary line L <b> 1 of the mounting portion 3 at the bonding portion includes the outer boundary line L <b> 2 of the bonding interface S <b> 1 between the mounting portion 3 and the base 2. A groove 4 having a depth T is formed inward from L1 by a predetermined distance S with respect to the joint surface S1.

In general, when the soft member is first molded first, and then the hard member is combined with the hard member to form the second member, the soft member is combined with the soft member in the mold clamping step of the second member. In the vicinity of the joint with the hard member to be formed by molding, the tip of the soft member may fall down toward the hard member, and burrs may be generated in a subsequent injection step.

On the other hand, in the present invention, in the secondary molding step using the mold 21 and the mold 22, the mold 22 having the protrusion 22-a having a shape corresponding to the groove 4 is used.
The protrusion 22 of the mold 22 is inserted into the groove 4 of the mounting portion 3 made of a soft material.
Since the base 2 made of a hard material is injection-molded in a state where −a is inserted, the vicinity of the joint with the base 2 that is combined with the mounting portion 3 in the mold clamping step of the secondary molding. Thus, the tip of the mounting portion 3 is prevented from falling down to the side of the base 2 by the protruding portion 22-a, so that burrs do not occur in the subsequent injection process.

In the present invention, the soft member is first formed first, and the soft member is combined with the hard member to form the second member. Therefore, the hard member, which is another conventional method, is first formed.
Next, the surface of the hard member is scratched by the mold at the time of mold clamping for the secondary molding of the soft member, which has occurred when the soft member is compounded with the soft member and then subjected to the secondary molding. The problem of poor appearance can also be solved.

As described above, the composite molding method of the present invention is not limited to the specific configuration of the above-described embodiment, and it is needless to say that the process may be modified, added or deleted as needed.

[0023]

As described above, according to the composite molding method of the present invention, it is possible to prevent the surface of the hard member from being damaged by the composite member formed by integrally molding the soft member and the hard member. This makes it possible to mold the product in a good appearance, and to prevent burrs from being generated at the joint between the soft member and the hard member in the injection step.

This composite molding method is suitable when the composite member is a door mirror mounting structure including a mirror mounting base made of a hard material and a mounting portion made of a soft material and provided on a peripheral portion of the base. Yes, in which case the first
The member is an attachment part and the second member is a base.

[Brief description of the drawings]

FIG. 1 is a view showing an example of a composite member obtained by integrally molding a soft member and a hard member by a composite molding method of the present invention, wherein FIG. 1 (a) is a perspective view showing the whole, and FIG. (A)
It is PP sectional drawing in FIG.

FIG. 2 is a view showing an example of the composite molding method of the present invention, wherein (a) shows a primary molding step and (b) shows a secondary molding step.

FIG. 3 is a perspective view showing an example of a conventional composite member in which a soft member and a hard member are joined together by fitting or bonding and combined to be integrated.

[Explanation of symbols]

Reference Signs List 1 door mirror mounting structure (composite member) 2 base (second member made of hard material) 3 mounting portion (first member made of soft material) 4 groove 11, 12 primary molding die 21, 22 secondary Mold for molding 22-a Projecting part of mold L1 Outline boundary line of mounting part at joint part of base and mounting part L2 Outline line of bonding interface of mounting part and base S1 Bonding interface of mounting part and base

Continued on the front page F term (reference) 3D053 FF28 GG06 HH15 4F202 AA09 AA15 AH17 AM33 CA11 CB01 CB12 CK11 CK43 CK52 4F206 AA09 AA15 AH17 AM33 JA07 JB12 JL02 JM04 JN12

Claims (2)

[Claims] 1. A composite molding method for molding a composite member by combining and integrating a first member made of a soft material and a second member made of a hard material, comprising: a primary molding step of injection molding the first member; A second molding step in which the first member is held in the secondary molding die and the second member is injection-molded and combined with the first member. Forming the first member into a shape having a groove that forms a gap between the first member and the second member in a predetermined range on the outer peripheral side of the joint of the first member and the second member; In the step, the second member is injection-molded in a state in which the protrusion is inserted into the groove of the first member using a mold having a protrusion having a shape corresponding to the groove. A composite molding method characterized by the above-mentioned. 2. The door mirror mounting structure, wherein the composite member comprises a mirror mounting base made of a hard material and a mounting portion made of a soft material and provided on a peripheral portion of the base.
The first member is a mounting portion and the second member is a base.
The composite molding method according to the above.