JP2002225141A - Method and device for welding crude material for thermoplastic resin moldings - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure that the weld of a crude material for thermoplastic resin moldings can be appropriately heated, in the method for welding the crude material for the thermoplastic resin moldings by which the weld of at least one of two or more pieces of the crude materials for the thermoplastic resin moldings, at least one piece of the crude material for the thermoplastic resin moldings of which has the weld, is thermally softened, then the weld and the crude material for the thermoplastic resin moldings or two or more pieces of the welds are brought into contact with each other and thus two or more pieces of the crude materials for the thermoplastic resin moldings are welded. SOLUTION: The weld is heated by moving an energized heating element which is shaped like a wire, extending almost opposite to the weld; and generates heat by energization, or the crude material for the thermoplastic resin moldings and consequently, making the energized heating element approach or bringing it into contact with the weld.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for welding a coarse molded article of a thermoplastic resin, and more particularly to a method of forming a coarse molded article formed of a thermoplastic resin such as ABS, PMMA, PS or the like. The present invention relates to a method and apparatus for manufacturing a finished product of a thermoplastic resin molded product such as a lamp, an intake manifold, a battery, and the like by welding a molded product coarse material).

[0002]

2. Description of the Related Art Heretofore, as one method of heating and softening a welded portion of a molded article having a welded portion, a method in which a heated heating element is brought into contact with the welded portion is used. is there. As the heating element, a heater having a structure in which an electric heater is built in a metal member and the metal member is heated by heat generated by the electric heater is generally used.

[0003]

However, in such a conventional heating method using a metal member with a built-in electric heater, it takes a long time or energy loss to raise the temperature of the metal member. Depending on the shape, there is a problem that the temperature of the portion facing the welded portion is not uniform.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a method and an apparatus for welding a molded article coarse material capable of appropriately heating a welded portion of the molded article coarse material. Is to provide.

[0005]

Means for Solving the Problems In order to achieve the above object, the present invention provides at least one of two or more thermoplastic resin coarse materials having a welded portion on at least one thermoplastic resin coarse material. After heating and softening the welded portion in one thermoplastic resin molded article rough material, the welded portion and the thermoplastic resin molded article rough material or two or more of the welded portions are brought into contact with each other to obtain two or more In the method of welding a thermoplastic resin molded article coarse material to weld the thermoplastic resin molded article coarse material,
A current-carrying heating element which is formed in a wire shape and extends substantially opposite to the welding portion and generates heat by energization, or the thermoplastic resin molded article coarse material is moved, whereby the welding of the current-carrying heating element is performed. The welded portion is heated by approaching or contacting the welded portion.

The electric heating element in the present invention is a heating element made of a nickel-chromium alloy or an iron-chromium alloy, and is made of a wire having a diameter of 2 to 6 mm. The electric heating element of the present invention can extend three-dimensionally because it is a wire material.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of an apparatus for welding a molded article rough material to which the present invention is applied will be described in detail with reference to FIGS. As shown in FIG. 1, in the present apparatus for welding a rough material, a lower table 1 having a platen shape is provided so as to be able to move up and down. lower receiving mold 2 to hold the lower molding body coarse material W ₁ which projects a welded portion S ₁ is is attached. A heating device 3 is provided above the lower receiving mold 2 so as to be able to enter and exit directly above the lower receiving mold 2. The heating device 3 includes a base plate-like support member 4 and a support member 4. the lower surface and the lower heating mechanism 6 of a plurality of upper and lower control rod the lower mold body 5.5 through wearing coarse material W for ₁ to a, through a plurality of upper and lower control rod 7, 7 on the upper surface of the support member 4 an upper heating mechanism 8 of the molded article for coarse material W ₂ on wearing, in are constituted. Then, the upper molding member coarse material W ₂ is welded portion S ₂ rib-like on the lower surface is a rear are projected.

The lower and upper heating mechanisms 8.6 are composed of energized heating elements 9.9 that generate heat when energized, and lower and upper holding members 10 and 11 that are formed of a platen and are insulative and heat resistant. Yes and, wherein each of the energization heater 9.9 is welded portion S _1, a wire the lower-upper molding body shaped to not make coarse material W ₁ - _{W 2}
Extends generally opposite to each S _2, and the holding member 10 to maintain the required shape against elongation due to thermal expansion
It is mounted inside the grooves 12, 12 engraved on the surface of 11, buried in the required length in the diametric direction and maintained in the required shape.

As shown in FIG. 2A, each of the energizing heating elements 9, 9 is bent upward at an acute angle to absorb the thermal expansion of the energizing heating elements 9, 9 themselves.
The absorbing portion 14 is provided with the holding member 10.
11 are housed in storage holes 15 provided respectively. When the absorbing portion 14 is formed to have an acute angle, the energized heating element 9
Even if the length is extended due to thermal expansion, the bent portions only approach each other, and this thermal expansion causes the current-carrying heating elements 9.9 in the grooves 12 to protrude greatly from the grooves 12. There is no.

The storage hole 15 is provided in the groove 12.
.12 and the holding members 10 and 11
Are formed in the shape of a long hole penetrating up and down, respectively, and about half of the side opposite to the side where the lower and upper molded body coarse materials W ₁ and W ₂ are located extends the energizing heating elements 9. Spreading in the direction. Further, the current-carrying heating element 9 in the storage hole 15
An insulating pressing member 16 having an inclined portion substantially at the same angle as the upper portion of the storage hole 15 is inserted between the vicinity of both ends of the holding member 9, and the energizing heating elements 9.9 are respectively attached to the holding members 10 and 11. It is fixed. Then, the electric heating elements 9
Are connected to a power source (not shown).

[0011] Above the heating device 3, the upper mold body coarse material W ₂ on the table 18 over the receiving die 17 attached to a lower surface for holding the, the lower receiving mold 2, and the lower table 1, etc. It is arranged to be able to ascend and descend in opposition.

As shown in FIG. 1, the above-described structure is provided between the lower receiving die 2 and the upper receiving die 17 which respectively hold _two lower and upper molded body coarse materials W ₁ and W _2. Then, the lower receiving mold 2 is raised via the lower table 1 and the upper receiving mold 17 is lowered via the upper table 18 so that the two lower and upper molded body coarse materials are moved. W ₁ - _{W 2} together with is close to the energization heater 9.9 respectively maintains its state.

As a result, the lower and upper molded body coarse materials W ₁ · W
_{The two} welds S ₁ and S ₂ are heated and softened by the current-carrying heating elements 9 and 9, respectively. After the completion of heating the welds S ₁ and S ₂ ,
Lowering the lower receiving mold 2 and raising the upper receiving mold 17,
Subsequently, the energized heating elements 9.9 are retracted from the position between the lower receiving mold 2 and the upper receiving mold 17. Thereafter, lowers the upper receiving die 17 together with raising the lower receiving mold 2 again, the heat softened welded portion S ₁ · S ₂ abut one another, welded portions S ₁ · S ₂
The lower and upper molded body coarse materials W ₁ and W ₂ are pressed together until they are cooled. As a result, the two lower and upper molded body coarse materials W ₁ .W
_{No. 2} is firmly welded at the welded portions S ₁ and S ₂ .

In the above embodiment, the current-carrying heating elements 9
The thermal expansion absorbing portion 9 of FIG. 9 is configured as shown in FIG. 2A, but is not limited thereto. For example, as shown in FIG. 2B, the absorbing portion 34 bent at an acute angle upward.
The same operation and effect can be obtained by connecting the holding members to the holding members 10 and 11 by connecting them in a semicircular arc shape and attaching them to the holding members 10 and 11 by hook-shaped traction members 35 and support members 36. In addition, the traction member 35
The same effect can be obtained by using a tension coil spring 45 instead of the hook as shown in FIG. 3A and a ring 55 as shown in FIG.

Furthermore, in the above embodiment, the fixing of the energizing heating elements 9 to the holding members 10 and 11 is performed by inserting the holding member 16 into the storage hole 15.
However, the present invention is not limited to this. For example, as shown in FIG.
The tension coil springs 46 may be fixed to the holding members 10 and 11 via brackets 49, respectively.

[0016]

As is apparent from the above description, the present invention provides at least one of the two or more thermoplastic resin coarse materials having a welded portion on at least one thermoplastic resin coarse material. After heating and softening the welded portion in the plastic molded article coarse material, the welded portion and the thermoplastic resin molded material rough material or two or more of the welded portions are brought into contact with each other to obtain two or more thermoplastic resins. A method for welding a molded article of a thermoplastic resin to weld a molded article of a coarse material, comprising: an electrically conductive heating element that is formed in a wire shape, extends substantially opposite to the welded portion, and generates heat by energization; Since the resin molded body coarse material is moved, and thereby, the energized heating element is brought close to or in contact with the welded portion to heat the welded portion, the welded portion of the molded product rough material is appropriately heated and softened. Such as being able to It has excellent practical effects.

[Brief description of the drawings]

FIG. 1 is a schematic front view showing one embodiment of an apparatus for welding a molded article coarse material to which the present invention is applied.

FIG. 2 is an enlarged detailed view of various embodiments according to a main part of FIG. 1;

FIG. 3 is an enlarged detailed view of various embodiments according to a main part of FIG. 1;

FIG. 4 is an enlarged detail view of another embodiment according to the main part of FIG. 1;

[Explanation of symbols]

 9 Electric heating element 10; 11 Holding member

Continued on the front page F term (reference) 4F211 AD05 AH17 AK09 TA01 TC14 TC15 TD07 TJ13 TJ14 TJ15 TJ22 TN08

Claims (7)

[Claims] 1. A welded portion of at least one of two or more thermoplastic resin coarse members having a welded portion on at least one thermoplastic resin coarse member is heated. After softening, the welded part and the thermoplastic resin molded article coarse material or a thermoplastic resin molded article in which two or more welded parts are brought into contact with each other to weld two or more thermoplastic resin molded article coarse materials In the method of welding the coarse material,
A current-carrying heating element which is formed in a wire shape and extends substantially opposite to the welding portion and generates heat by energization, or the thermoplastic resin molded article coarse material is moved, whereby the welding of the current-carrying heating element is performed. And welding the welded portion by approaching or abutting the portion. 2. A method according to claim 1, wherein said energized heating element is buried in a required length in a diametrical direction, and said groove for maintaining said energized heating element in a required shape is provided. A method of welding a thermoplastic resin molded article, wherein the heating element is held by holding means. 3. The method for welding a thermoplastic resin coarse material according to claim 1, wherein a current-carrying heating element having an absorbing portion for absorbing thermal expansion is brought close to or in contact with the welding portion. Welding method of the thermoplastic resin molded article. 4. A method for heating at least one of two or more thermoplastic resin coarse materials having a welded portion to at least one thermoplastic resin coarse material, wherein the welded portion is heated. After softening, the thermoplastic resin molded article roughened by welding the welded portion and the thermoplastic resin molded article rough material or two or more of the welded portions and welding the two or more thermoplastic resin molded article coarse materials. In the material welding apparatus, a heating element for heating and softening the welded portion is constituted by an energized heating element that generates heat by energization, extends in a wire shape and substantially opposes the welded portion, and, for elongation due to thermal expansion. The heating element is held by a holding member to maintain the required shape, and the heating element advances with respect to the welding portion, or the welding section advances with respect to the heating element, and the energized heating element is In contact with the weld A welding apparatus for a thermoplastic resin coarse material characterized by heating the welded portion close to or in contact therewith. 5. The welding apparatus for a thermoplastic resin coarse material according to claim 4, wherein the holding member has a groove capable of burying the current-carrying heating element in a required length in a diameter direction and maintaining a required shape. What is claimed is: 1. A welding apparatus for a thermoplastic resin molded article. 6. The apparatus for welding a coarse thermoplastic resin article according to claim 4, wherein the current-carrying heating element has an absorbing portion for absorbing thermal expansion. Material welding equipment. 7. The welding apparatus for a thermoplastic resin coarse material according to at least one of claims 4 to 6, wherein the energizing heating element is a wire material having a diameter of 2 to 6 mm. Welding device for plastic resin molded material.