JP2002086488A - Composite molding method of resin and composite molded resin material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently integrate an already molded resin member, which is preformed by an extrusion molding method and other method, and a member formed by injection molding and to prevent the generation of a stepped part, a bead or the like at the bonded place of both members. SOLUTION: In a mold region heating the vicinity of the bonded part A with an injection molded member in the already molded resin member and corresponding to the bonded part B with the already molded resin member of the injection molded member, the already molded resin member is set to the position where the bonded part A can come into contact with the bonded part B in opposed relationship and, subsequently, a resin is injected in the mold to obtain a predetermined injection-molded member, and the bonded part A and the bonded part B are welded to obtain a member wherein the injection- molded member and the already molded resin member are integrated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for joining a resin member which has already been molded and an injection molded resin member which is molded by an injection molding method at the time of injection molding.

[0002]

2. Description of the Related Art As a molding technique for a resin molded product, an injection molding method for molding a resin molded product having a predetermined shape by injecting a molten resin material into a cavity formed by a mold member. It has been known. However, in this injection molding method, since a molten resin material is caused to flow into a mold and molded, there is a limitation due to the flow distance and there is an inconvenience that molding of a long product is particularly difficult.

That is, in molding a long product, the temperature is lowered while the resin moves from the injection port to the end of the mold separated from the injection port, and the fluidity is impaired. A situation occurs in which it is not possible to properly fill all corners.
For this reason, a member having a long part has been produced by joining a part formed by injection molding and a long part formed by extrusion molding or the like by means of welding, welding, or the like and integrating them. However, such a joining means inevitably generates a step, a bead, or the like at the joined portion. For example, in a tube-out elbow joint or the like used for fluid conduction, the step, the bead, or the like at the joined portion. Thus, there is a problem that the fluid is retained.

Further, in the case of the elbow joint for forming a tube by the above-mentioned conventional manufacturing method, the joint portion and the tube portion are separately formed, and then both are joined.
The process is complicated and the manufacturing cost increases. Also, A,
In the resin member composed of the B portion, if the melting temperatures of the resins constituting the A and B portions are different, injection molding in one step is impossible even if the resin member is not particularly long,
It is necessary to join each of the parts A and B after forming them, and the above-mentioned problem occurs at the joint.

[0005] Furthermore, in the resin member composed of the portions A and B, even if the resin constituting each of the portions A and B is the same material and can be manufactured in a single step by injection molding, for example, after the molding, it is necessary for the portion A. Even in the case where some processing cannot be performed, the same inconvenience as described above occurs because each of the parts A and B must be injection-molded separately, and after processing the part A, the two parts must be joined.

[0006] Further, the above-mentioned inconvenience is caused by the fact that, in the resin member composed of the portions A and B, it is necessary to form the portion A and the portion B by, for example, the injection molding method and the portion B by the extrusion molding method. The same is true for.

[0007]

According to the present invention, there is provided a molded resin member formed in advance by an extrusion molding method or the like,
In unifying members formed by injection molding,
(A) a step of heating the vicinity of the joint A with the injection-molded member in the molded resin member; (b) a mold portion corresponding to the joint B of the injection-molded member with the molded resin member;
(C) setting the molded resin member at a position where the joint A can face the joint B;
Injecting the resin into the mold to obtain a predetermined injection molded member, and welding the joint A and the joint B to obtain a member in which the injection molded member and the already molded member are integrated with each other. An object of the present invention is to provide a composite molding method to solve the above-mentioned conventional problems.

In the above steps, the heating of the joint A may be performed outside the mold.

[0009] In the above process, the heating of the joint A may be performed in a mold.

Further, the composite molded resin member according to the present invention is
A member formed by integrating a molded resin member formed in advance by an extrusion molding method or the like and a member formed by injection molding, and (a) the vicinity of a joint A with the injection molded member in the molded resin member. Heating (b)
(C) setting the molded resin member at a position in the mold portion corresponding to the joint B of the injection molded member with the molded resin member so that the joint A can face the joint B; A step of injecting a resin into a mold to obtain a predetermined injection molded member, and welding the joint A and the joint B to obtain a member in which the injection molded member and the molded resin member are integrated; It is manufactured by

In the resin member, the joint A may be heated outside the mold.

Further, in the above resin member, the joint A
May be done in a mold.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a resin composite molding method and a composite molded resin member according to the present invention will be described with reference to the drawings. FIGS. 1 to 3 show one embodiment of a manufacturing process of a composite molded resin member according to the present invention. In this embodiment, the composite molded resin member is formed by a joint and a tube integrally fixed thereto. Tube fitting. In FIG. 1, reference numeral 1 denotes PTFE as a pre-molded resin member preformed by extrusion.
Tube. Reference numeral 2 denotes a movable mold having a core 2a, and the tube 1 is mounted on the core 2a. The end of the tube 1 is fusion-bonded to an end of a joint 4 to be described later as a joint A. The joint A is heated in advance before being mounted on the mold 2. Heating is performed up to near the melting temperature of the resin.

In FIG. 2, reference numeral 3 denotes a mold for injection molding of a joint 4 described later, and a joint matrix 4a is formed. B1 indicates an end of the joint 4 in the matrix 4a, which corresponds to a joint B to be described later joined to the joint A. Reference numeral 4b denotes a core forming the hollow portion of the joint 4, and reference numeral 4c denotes an injection port of the molten resin. Now, the mold 2 on which the tube 1 having the heated joint A at the tip is mounted is moved in the direction of the arrow in the figure, and the tip of the core 2a is brought into close contact with the end of the core 4b of the mold 3. Fix it at the position you set.
Next, the molten resin is injected from the injection port 4c. In this embodiment, the resin material uses PFA. Molten P
FA indicates a mold 4a, a core 2a and a core 4 in the mold 3.
This flows and fills the slit formed by b.

In the portion B1 of the mold 3, the matrix 4a
A slit is formed between the tube and the joint A of the tube 1 mounted on the core 2a. Here, the molten PFA flows into the slit and contacts the joint of the tube 1 again. Fuse. After the resin is solidified, the core 2a and the core 4
b is removed and a pair of molds 3 and 3 are separated to take out a tube delivery joint as a completed composite molded resin member.

FIG. 3 shows a tube completed as described above.
It is a figure which shows a bund joint. The tube 1 as a molded resin member by extrusion molding and the joint 4 by injection molding are integrated at the respective joints A and B, so that no steps or beads are generated.

When the above-mentioned tube connecting joint is formed by a conventional injection molding method, it is necessary to use the same resin material for the joint portion and the tube portion, and also, to form the tube from the resin injection port. As described above, there is a problem that the molten resin does not easily flow to the end because the distance to the end of the matrix corresponding to the end is long. When the tube and the joint are separately injection-molded and the two are joined, it is not necessary to use the same resin material for both members. However, the number of steps is increased as a whole, and a step or bead is formed at the joint. As described above, it is inevitable that the occurrence of a problem or the like occurs.

In the above-described embodiment, an example is shown in which the tube as the molded resin member is formed by extrusion molding. However, the tube may be formed by injection molding or another molding method. . Further, in the above-described embodiment, different resin materials are used for the tube and the joint, however, needless to say, the same material may be used.

[0019]

According to the construction and operation described above, the present invention can be expected to have the following effects. (1) A high-quality long resin member can be obtained at low cost. (2) A high quality resin member can be easily obtained at a low cost by easily coping with a case where a different resin material needs to be used depending on a component. (3) In a resin member composed of a plurality of parts, after injection molding for each part, all or any of the parts are subjected to necessary processing, and the parts are joined to form a high-quality whole, that is, a joint part. It is easy to make one without steps, beads, etc. (4) In the resin member composed of the portions A and B, for example, B
It is possible to effectively cope with the case where the part needs to be formed by an extrusion molding method or any other method than injection molding.

[Brief description of the drawings]

FIG. 1 is a view showing a related configuration of a tube and a movable mold according to an embodiment of the present invention.

FIG. 2 is a view showing a configuration relating to a movable mold in which an injection mold and a tube are mounted in relation to FIG. 1;

FIG. 3 is a partial cross-sectional side view of a composite molded resin member formed by the steps shown in FIGS.

Claims (6)

[Claims] 1. A method of integrating a previously formed resin member formed beforehand with a member formed by injection molding, wherein (a) heating the vicinity of a joint A of the formed resin member with the injection molded member. (B) setting the molded resin member at a position where the joint A can be in opposition to the joint B at the mold portion corresponding to the joint B with the molded resin member of the injection molded member. Step, (c)
Next, a step of injecting a resin into a mold to obtain a predetermined injection-molded member, and welding the joint A and the joint B to obtain a member in which the injection-molded member and the already-molded member are integrated.
A resin composite molding method comprising the above steps. 2. The method according to claim 1, wherein the heating of the joint A is performed outside the mold. 3. The method according to claim 1, wherein the heating of the joint A is performed in a mold. 4. A member formed by integrating a pre-formed resin member and a member formed by injection molding, and (a) heating the vicinity of a joint A of the pre-formed resin member with the injection molded member. (B) setting the molded resin member at a position where the joint A can be in opposition to the joint B at the mold portion corresponding to the joint B with the molded resin member of the injection molded member. Step (c) Next, a predetermined injection molded member is obtained by injecting a resin into the mold, and the joint A and the joint B are welded to integrate the injection molded member with the already molded member. The step of obtaining A composite molded resin member obtained by the above steps. 5. The method according to claim 4, wherein the heating of the joint A is performed by:
5. The composite molded resin member according to claim 4, wherein the composite molded resin member is formed outside a mold. 6. The composite molded resin member according to claim 4, wherein the heating of the joint A is performed in a mold.