JPH10166449A - Apparatus and method for welding and joining resin molded products - Google Patents

Abstract

(57) [Summary] [Problem] To perform welding operation of two resin molded products with high accuracy while improving productivity. SOLUTION: A first concave portion 19 of a first die 15 and a second concave portion 19 are provided.
The first resin molded article 11 with the first projection 21 of the mold 17
Is formed, and the second resin molded product 13 is injection-molded using the second concave portion 23 of the second mold 17 and the second convex portion 25 of the first mold 15. After molding each of the resin molded products 11 and 13, the second mold 17 is moved up to a position where the respective resin molded products 11 and 13 face each other, and the heat source 31 is inserted between the molds 15 and 17. The joint ends 11a and 13a are heated and melted. After the heating and melting, the first mold 15 is moved closer to the second mold 17 with the heat source 31 retracted, and the joining end 11
a and 13a are brought into close contact with each other and welded.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and a method for welding two resin molded articles to join each other.

[0002]

2. Description of the Related Art When two resin molded products are joined to each other, for example, a method shown in FIGS. 14 to 17 is employed. First, as shown in FIG. 14, jigs 5 for heat welding two resin molded articles 1, 3 produced by injection molding.
7 respectively. The resin molded products 1 and 3 correspond to, for example, half halves of a container such as a fuel tank for an automobile, and these two halves, that is, the resin molded products are welded and joined to each other to form a container. Become.

From the state shown in FIG. 14, a heat source 9 such as a hot plate or an infrared lamp is used as shown in FIG.
Insert and place between each other. At this time, use is made of a resin which has an effect on welding due to oxidation or the like when the joining end surfaces 1a, 3a of the resin molded products 1, 3 are in contact with each other or the joining ends 1a, 3a come into contact with the heat source 9. In such a case, the heat source 9 is kept at a predetermined distance from the heat source 9.

By continuing the state shown in FIG. 15 for a predetermined period of time, the joint ends 1a and 3a of the resin molded products 1 and 3 are heated and melted. When the joining ends 1a and 3a are melted, the heat source 9 is retracted from the jigs 5 and 7 as shown in FIG. 16, and then the upper jig 5 is lowered as shown in FIG. It is lowered so as to approach the fixture 7, and the respective joint ends 1a, 3a of the resin molded products 1, 3 are brought into close contact with each other.
This close contact state is performed until the joining ends 1a and 3a are cooled and solidified, whereby the resin molded articles 1 and 3 are welded and joined.

[0005]

However, in the conventional apparatus for welding and joining resin molded articles as described above,
There are the following problems.

(1) Since each resin molded product is welded and joined in a state of being separated from the molding die, the accuracy of alignment between the joint ends is reduced due to shrinkage or deformation after detachment, and accurate welding and joining are performed. Can not.

(2) In the case where the heat source is heated while being separated from the joint end, it is necessary to keep the interval constant. However, the joint end has a complicated shape or the rigidity of the resin molded product. Is relatively low, it is difficult to keep the above-mentioned interval constant with a sufficient holding force, and improvement is desired.

(3) It is necessary to transfer a resin molded product molded by a resin molding die to another welding and joining apparatus, resulting in poor productivity.

Accordingly, an object of the present invention is to perform a joining operation with high accuracy while improving productivity.

[0010]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention firstly provides first and first welded joints.
A molding die capable of molding each of the second resin molded products is provided. When the mold is opened after molding each of the resin molded products, the first resin molded product is placed in the mold. It comprises a first mold for holding and a second mold for holding the second resin molded product in the mold, and the resin molded products are opposed to each other while holding each resin molded product. A state in which at least one of the first and second molds is slidably movable so as to be in a position, and the respective resin molded products respectively held by the first and second molds face each other. In this configuration, a heat source is provided between the resin molded products and heats the joint end between the first and second resin molded products.

According to the above construction, each of the first and second resin molded articles does not come off from the mold after molding, and is held in each of the first and second molds. By the heat source that has entered between the molds, the joining end is heated and melted, and then, with the heat source retracted, the molds approach each other,
The melted joint ends come into contact and are welded and joined.

Secondly, each of the first and second resin molded products is an injection-molded product composed of a half of a container, and each of the first and second resin molded products is held in a mold after molding. The end on the opening side is exposed, and this exposed portion becomes a joining end.

According to the above construction, after the injection molding, the resin molded product composed of a half body held in the mold has its opening end exposed to the outside, and the exposed portion is heated and melted by a heat source. The container is obtained by post-welding.

Third, the heat source is located between the first and second molds holding the first and second resin molded products in the mold, respectively, and is a joint end of the resin molded products. The part is positioned with respect to each mold while being separated from the part by a predetermined distance.

According to the above configuration, when the resin molded article is heated and melted, the heat source is positioned at a predetermined distance from the joining end of the resin molded article, and the resin molded article is sufficiently placed in the molding die. Holding with a sufficient holding force, the above-mentioned state separated by a predetermined distance is reliably held.

Fourthly, the first and second dies are located at a position near the joint end of each resin molded product, and the resin molded product and the die before welding are formed when the die is opened after molding. And a flange forming portion for forming a flange portion for preventing separation from the flange portion.

According to the above configuration, since the flange portion is formed near the joining end of the resin molded product, the holding force of the mold on the resin molded product is increased, and the separation between the resin molded product and the mold is performed. To prevent.

Fifth, the first and second parts are welded to each other.
Are molded by a molding die composed of first and second dies, and after molding, the first die forms the first resin molded product in a state where the dies are opened. Holds the second resin molded product in the mold respectively, slides at least one of the first and second molds, and opposes each other so as to be in a position where the respective resin molded products can be joined to each other; In this state, a heat source is arranged between the molds to heat the joint end of each resin molded product, and after the joint end is melted by heating, the heat source is retracted from between the molds, and the molds are removed. According to the above-described joining method in which the welded ends are brought close to each other and brought into contact with each other and welded, the first and second resin molded products are directly molded into the first and second molds after molding. While being held in each case, heat and melt the joint end by the heat source It enables contact of the joining end portion with a die mutual approaching after retraction, thereby enabling highly accurate fusion bonded.

[0019]

According to the first invention or the fifth invention,
While the first and second resin molded products are held in the first and second molds, respectively, as the molding dies, heating and melting by the heat source entered between the molds and retreat of the heat source The subsequent joining ends can be in contact with each other, and high-precision welding can be performed. In addition, since it is not necessary to transfer each resin molded product to a dedicated welding and bonding apparatus, productivity can be improved. it can.

According to the second aspect, after the injection molding, each end on the opening side of the resin molded product formed of a half body held in the mold is exposed to the outside, and each exposed portion is heated by a heat source. Since welding and joining are performed after melting, a container having a high-precision welding joint can be obtained.

According to the third aspect of the invention, the heat source is positioned at a predetermined distance from the joining end when the resin molded article is heated and melted, and the resin molded article is sufficiently placed in the molding die. Since it is held with a holding force, it is possible to reliably hold the above-mentioned state separated by a predetermined distance,
Accurate welding work can be performed.

According to the fourth aspect of the present invention, by forming the flange portion at the joint end of the resin molded product, the holding force of the mold on the resin molded product is increased, and the separation between the resin molded product and the mold is prevented. It can be reliably prevented.

[0023]

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

FIGS. 1 to 11 are schematic sectional views showing an apparatus for welding and joining resin molded articles and an operation thereof according to an embodiment of the present invention.
Each of the resin molded articles 11 and 13 described above corresponds to a half-split body obtained by half-halving a container such as a fuel tank for a car, for example, as in the conventional example.

The first and second resin molded products 11, 13
Are first and second molds 15, 1 which are injection molds.
7 is formed. A first recess 19 is formed on the upper side of the first mold 15 in the drawing, and the first recess 19 is formed on the upper side of the second mold 17 in the drawing. Article 11
Are formed, respectively.
On the lower side of the second mold 17 in the drawing, a second concave portion 23 is provided.
However, on the lower side of the first mold 15, the second recess 2 is provided.
3 and the second convex portion 25 for molding the second resin molded product 13
Are formed respectively. Between the first convex portion 21 and the second concave portion 23 of the second mold 17, a gate 27 to which a molten resin is injected and supplied from the outside is provided.

Also, around the first and second convex portions 21 and 25, there are formed end portions for forming joint end portions 11a and 13a of the first and second resin molded products 11 and 13 with each other. Forming groove 21
a and 25a are formed respectively.

The first mold 15 is provided so as to be movable in the left-right direction in FIG. 1 which approaches and separates from the second mold 17, and the second mold 17 is moved with respect to the base 29. Figure 1
5 and the position in FIG. 5 can be moved in the vertical direction in the figure by a mold vertical drive mechanism 30 such as a hydraulic cylinder. Instead of the second mold 17, a first mold 15 may be provided so as to be vertically movable.

As shown in FIG. 1, a heat source 31 for welding and joining the molded resin articles 11 and 13 to each other is provided by a heat source vertical drive mechanism 33 such as a hydraulic cylinder.
5 is movable between a retracted position in a state where it is separated from the second mold 17 and an advanced position as shown in FIG.
6 can be moved together with the heat source vertical drive mechanism 33 between the non-heating position and the heating position in FIG.

Next, the operation of the above welding apparatus will be described. First, the first mold 15 is brought closer to the second mold 17 from the state of FIG. 1 and the mold is clamped as shown in FIG.
As shown in FIG. 3, molten resin is injected from the gate 27 of the second mold 17. After the injected molten resin is cooled and solidified, the first mold 15 is separated from the second mold 17 to open the mold as shown in FIG. 4, thereby opening the first and second resin molded products 11, 13 is obtained.

At this time, the first resin molded product 11 is
The second resin molded product 13 is provided in the first recess 19 of the mold 15 of FIG.
Are respectively held in the second concave portions 23 of the second mold 17. Each of the resin molded products 11, 13 is connected by the resin injected into the gate 27 as shown in FIG. 3, so that when the mold is opened, each of the resin molded products 11, 13 is connected to each of the molds 15, 13. In the case where each of the first and second convex portions 21 and 2 on the male side is not held as shown in FIG.
A knockout pin for pushing out the resin molded products 11 and 13 may be provided on the 5th side.

The second mold 17 is moved upward from the state shown in FIG. 4 so that the second recess 23 faces the first recess 19 of the first mold 15 as shown in FIG. At the same time, the heat source 31 is advanced and moved between the resin molded products 11 and 13 held in the concave portions 19 and 23.

From the state shown in FIG. 5, the first mold 15 is moved rightward in the figure so as to approach the second mold 17, and the heat source 31 is also moved in the same direction.
As shown in FIG. 6, the mold is closed so that the heat source 31 is held between the first mold 15 and the second mold 17. At this time, since the first and second resin molded products 11 and 13 have the joining ends 11a and 13a projecting from the surfaces of the molds 15 and 17, the projecting joining ends 11a and 13a are connected to the heat source 31.
And is heated.

The closed state of the mold shown in FIG.
a and 13a are continued until they are melted by heating. After the heating and melting, as shown in FIG. 7, the first mold 15 is moved to the left in the figure to separate it from the second mold 17, and The heat source 31 is also moved in the same direction, so that the heat source 31 is connected to the joining ends 11a, 1a of the resin molded articles 11, 13.
3a.

Thereafter, as shown in FIG. 8, with the heat source 31 retracted, while the joining ends 11a, 13a are being melted, the first mold 15 is moved to the first mold 15 as shown in FIG. The mold is closed by approaching the mold 17 of each of the second and third resin molded articles 11 and
13 are crimped to each other. In the mold closed state, the molten joining ends 11a and 13a
It is continued for a predetermined time until it is cooled and solidified, whereby a resin product 35 such as a container in which the resin molded products 11 and 13 are welded and joined to each other is obtained.

After cooling and solidifying, as shown in FIG.
The mold 15 is separated from the second mold 17 to open the mold. At this time, a knockout pin (not shown) from the second mold 17 side is held so that the resin product 35 is held by the first mold 15. After performing an operation such as pressing against the first mold 15 side by the like or the like, as shown in FIG. 11, the resin product 35 is taken out of the mold by an ejector (not shown) or the like.

As described above, in the above welding apparatus,
The first and second molds 15 and 17 after the injection molding are used.
The second resin molded products 11 and 13 are directly used as the first and second resin molded products 11 and 13.
The resin molded products 11 and 13 are welded and joined to each other while being held in the respective dies 15 and 17. Therefore, the molded products 11 and 13 are not affected by shrinkage and deformation after molding.
The alignment accuracy between 1a and 13a is improved, and high-precision welding can be performed. In addition, since it is not necessary to transfer to a special welding apparatus after molding, productivity is also improved.

FIG. 12 shows another embodiment of the present invention. In the present embodiment, the mold 17 (15) is provided with a positioning jig 37 for the heat source 31, and the heat source 31 is brought into contact with the positioning jig 37 so that the heat source 31 is connected to the mold 17 (15). 15) Resin molded product 13 held in
Heating can be performed at regular intervals without contacting (11). This makes it possible to cope with a case where the joining end face of the joining end 11a (13a) has a complicated shape or the rigidity of the resin molded product is low.

FIG. 13 shows still another embodiment of the present invention. In this embodiment, the resin molding 13
A flange 13b (11b) is formed near the joint end 13a (11a) so that (11) is securely held by the mold 17 (15) when the mold is opened after molding.
The mold 13 (11) is provided with a flange forming portion 17b (15b). Thereby, the positional accuracy between the joining ends 11a and 13a is further improved at the time of welding and joining, and more accurate welding can be achieved.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of an apparatus for welding and joining resin molded articles according to an embodiment of the present invention.

FIG. 2 is an operation explanatory view showing a state in which a mold for injection molding in FIG. 1 is clamped.

FIG. 3 is an operation explanatory diagram showing a state in which a molten resin is injected into a mold from the state of FIG. 2;

FIG. 4 is an operation explanatory view showing a state where the mold is opened from the state of FIG. 3;

FIG. 5 is an operation explanatory diagram showing a state in which a heat source is advanced into a mold after resin molded articles are opposed to each other from the state of FIG. 4;

6 is an operation explanatory view showing a state where the resin molded product is being heated by a heat source with respect to the state of FIG. 5;

FIG. 7 is an operation explanatory view showing a state where the mold is opened from the state of FIG. 6;

FIG. 8 is an operation explanatory view showing a state in which the heat source is retracted from the state of FIG. 7;

9 is an operation explanatory view showing a state in which the mold is closed from the state of FIG. 8 and the bonding end portions of the resin molded product are pressed together.

FIG. 10 is an operation explanatory view showing a state where the mold is opened from the state of FIG. 9;

11 is an operation explanatory view showing a state where the resin product is taken out of the mold from the state of FIG. 10;

FIG. 12 is a sectional view of a main part showing another embodiment of the present invention.

FIG. 13 is a sectional view of a main part showing still another embodiment of the present invention.

FIG. 14 is a sectional view of a conventional apparatus for welding and joining resin molded articles.

FIG. 15 is an operation explanatory view showing a state in which a heat source is inserted between the resin molded products and heated from the state of FIG. 14;

16 is an operation explanatory view showing a state in which the heat source is retracted from the state of FIG.

17 is an operation explanatory view showing a state in which the resin molded products are brought closer to each other and joined from the state of FIG. 16;

[Explanation of symbols]

 11 First resin molded product 11a, 13a Joining end 11b, 13b Flange portion 13 Second resin molded product 15 First die 15b, 17b Flange molded portion 17 Second die 31 Heat source

Claims (5)

[Claims] 1. A molding die capable of molding first and second resin molded products to be welded and joined to each other, and the molding die opens the mold after molding each of the resin molded products. When
A first mold for holding the first resin molded product in the mold;
And a second mold for holding the resin molded products in the mold, and the first and second molds are located at opposing positions where the resin molded products can be joined to each other while holding each resin molded product. At least one of the molds is configured to be slidable,
In a state where the resin molded products held by the first and second molds respectively face each other, the resin molded products are disposed between the resin molded products and are disposed between the first and second resin molded products. And a heat source for heating a joint end of the resin molded article. 2. Each of the first and second resin molded products is an injection molded product composed of a half of a container, and the opening of each of the half when the mold is held in a mold after molding. The end on the side is exposed and this exposed portion becomes a joint end.
An apparatus for welding and joining resin molded articles as described in the above. 3. A heat source is located between the first and second molds holding the first and second resin molded products in the mold, respectively, at a joint end of the resin molded products. 3. The welding and joining apparatus for resin molded articles according to claim 1, wherein the apparatus is positioned with respect to each of the molds at a predetermined distance from the mold. 4. The first and second dies are located at a position close to a joint end of each resin molded product, and the resin molded product and the die before welding when the mold is opened after the molding is opened. 3. The apparatus according to claim 1, further comprising a flange forming portion for forming a flange portion for preventing separation. 5. The first and second resin molded products to be welded and joined to each other are molded by a molding die composed of first and second dies, and after molding, the first and second resin molded products are opened in the first state. The mold holds the first resin molded product in the first resin mold and the second mold holds the second resin molded product in the mold, and slides at least one of the first and second molds. Each resin molded product is opposed to each other so as to be in a position where it can be joined, and in this state, a heat source is arranged between the molds to heat the joint end of each resin molded product,
A resin molded product characterized in that after joining ends are melted by heating, a heat source is retracted from between the molds, and the respective molds are brought closer to each other so that the melted joining ends are brought into contact with each other and welded and joined. Welding method.