JP4433362B2 - Method and apparatus for welding thermoplastic resin molding material - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method and apparatus for welding a thermoplastic resin molded body material , and more specifically, a molded body material molded from a thermoplastic resin such as ABS, PMMA, PS, or the like (hereinafter abbreviated as a molded body material ). And, for example, a method and an apparatus for manufacturing a finished product of a thermoplastic resin molded body such as an automobile lamp, an intake manifold, and a battery.
[0002]
[Prior art]
Conventionally, as one method of heating and softening a welded part in a molded body material having a welded part, there is a method in which a heated heating element is brought into contact with the welded part. And as this heat generating body, the thing of the structure which incorporates an electric heater in a metal member and heats a metal member by the heat_generation | fever of an electric heater is generally used.
[0003]
[Problems to be solved by the invention]
However, in such a conventional heating method using a metal member with an electric heater, it takes a long time or energy loss to raise the temperature of the metal member, and depending on the shape of the metal member, There was a problem that the temperature of the facing portion was not uniform.
[0004]
The present invention has been made in view of the above circumstances, and its object is to provide a welding method and apparatus of the molding material capable of heating the welded portion of the molded body material to accurately is there.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides the above-mentioned welding in at least one thermoplastic resin molded material of two or more thermoplastic resin molded materials having a welded portion in at least one thermoplastic resin molded material . Thermoplastic resin molding in which two or more thermoplastic resin molded materials are welded by bringing the welded portion and the thermoplastic resin molded material or two or more welded portions into contact with each other after heat softening the portion In the welding method of the body material , an energizing heating element that forms a wire shape and extends in a three-dimensional manner facing the welding portion and generates heat by energization, or the thermoplastic resin molded body material is used. It is made to move, and this makes the said heating part approach or contact | abut to the said welding part, and heats this welding part, It is characterized by the above-mentioned.
[0006]
The energization heating element in the present invention is a heating element made of nickel / chromium alloy or iron / chromium alloy, and is made of a wire material having a diameter of 2 to 6 mm.
Since the energization heating element of the present invention is a wire material, it can extend three-dimensionally.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of a molded body material welding apparatus to which the present invention is applied will be described below in detail with reference to FIGS. As shown in FIG. 1, in the welding apparatus for the molded body material , a lower table 1 having a surface plate shape is disposed so as to be movable up and down. A lower receiving mold 2 for holding the lower molded body material W ₁ protruding from the portion S ₁ is attached. In addition, a heating device 3 is disposed above the lower receiving die 2 so as to be able to enter and exit right above the lower receiving die 2. The heating device 3 includes a surface plate-like support member 4 and a support member 4. The lower heating mechanism 6 for the lower molded body material W ₁ mounted on the lower surface of the support member 5 via a plurality of vertical adjustment bars 5, 5 and the upper surface of the support member 4 mounted via the plurality of vertical adjustment bars 7, 7. an upper heating mechanism 8 on molding body material W ₂ that, in are constituted. The upper molded body material W ₂ has a rib-like welded portion S ₂ projectingly provided on the lower surface which is the back surface.
[0008]
These lower and upper heating mechanisms 8 and 6 are composed of energizing heating elements 9 and 9 that generate heat when energized and lower and upper holding members 10 and 11 that form a surface plate and are insulating and heat resistant. each of the energization heater 9, 9, the lower-upper molding body not make a wire-like material W _1,
Grooves 12. Which are formed on the surfaces of the holding members 10 and 11 so as to extend substantially opposite to the welded portions S ₁ and S ₂ of W ₂ and to maintain a required shape against expansion due to thermal expansion. 12 is embedded in a required length in the diametrical direction so as to be maintained in a required shape.
[0009]
Further, as shown in FIG. 2A, each of the energization heating elements 9 and 9 is bent upward at an acute angle to form an absorption portion 14 that absorbs the thermal expansion of the energization heating elements 9 and 9 itself. The absorbing portion 14 is housed in housing holes 15 provided in the holding members 10 and 11, respectively.
In addition, if the absorption part 14 is formed in an acute angle shape, even if the energization heating elements 9 and 9 are thermally expanded and the length is extended, the bent parts only approach each other. The energization heating elements 9 and 9 do not protrude greatly from the grooves 12 and 12.
[0010]
The storage hole 15 extends along the grooves 12 and 12 and has a long hole shape that vertically penetrates the holding members 10 and 11, and the lower and upper molded body materials W ₁ and W. About half of the side opposite to the side where W ₂ is located spreads in the direction in which the energization heating elements 9 and 9 extend. In addition, an insulating pressing member 16 having an inclined portion having substantially the same angle as that of the upper portion of the storage hole 15 is inserted between both ends of the conductive heating elements 9 and 9 in the storage hole 15. The bodies 9 and 9 are fixed to the holding members 10 and 11, respectively. The both ends of the energization heating elements 9, 9 are connected to a power source (not shown).
[0011]
Further, the above heating device 3, the upper receiving die 17 for holding the upper molded body material W ₂ on the table 18 attached to the lower surface, the lower receiving mold 2, so as to face the lower table 1, such as lifting It is possible to arrange.
[0012]
As shown in FIG. 1, the structure thus configured has a heating device 3 at a position between the lower receiving mold 2 and the upper receiving mold 17 that respectively hold _two lower and upper molded body materials W ₁ and W _2. Then, the lower receiving mold 2 is raised through the lower table 1 and the upper receiving mold 17 is lowered through the upper table 18 to thereby lower the two lower and upper molded body materials W ₁ and W _2. Are kept close to the energization heating elements 9, 9, respectively, and the state is maintained.
[0013]
Accordingly, the welding portion of the lower-upper molding body material _{W 1} · _{W 2 S} 1 ·
S ₂ is heated and softened by the energization heating elements 9 and 9 respectively. After the heating of the welded portions S ₁ and S ₂ is completed, the lower receiving die 2 is lowered and the upper receiving die 17 is raised, and then the energization heating elements 9 and 9 are placed between the lower receiving die 2 and the upper receiving die 17. Retract from position. Thereafter, the lower receiving mold 2 is raised again, and the upper receiving mold 17 is lowered to bring the heat-softened welded portions S ₁ and S ₂ into contact with each other, and lower until the welded portions S ₁ and S ₂ are cooled. The upper molded body materials W ₁ and W ₂ are pressed together. As a result, the two lower and upper molded body materials W ₁ and W ₂ are firmly welded at the welded portions S ₁ and S ₂ .
[0014]
In the above-described embodiment, the thermal expansion absorbing portion 14 of the energization heating elements 9 and 9 is configured as shown in FIG. 2A, but is not limited to this. For example, as shown in FIG. As described above, the same effect can be obtained even when the absorbing portion 34 bent upward at an acute angle is connected in a semicircular arc shape and attached to the holding members 10 and 11 by the hook-like pulling member 35 and the support member 36. Further, the pulling member 35 may be a tension coil spring 45 instead of a hook as shown in FIG. 3A, or a ring 55 as shown in FIG. The following effects can be obtained.
[0015]
Furthermore, in the above embodiment, the energization heating elements 9 and 9 are fixed to the holding members 10 and 11 by inserting the holding members 16 into the storage holes 15, but the present invention is not limited to this. for example, as shown in FIG. 4, the tensile secured by brackets 48, 48 pressing the vicinity of both ends of the energization heater 9 to the support member 47 which is elastically supported by the coil spring 46, the tension coil spring 46 in the holding member 10, 11 You may make it latch respectively via the bracket 49. FIG.
[0016]
【The invention's effect】
As is clear from the above description, the present invention relates to the thermoplastic resin molded body material in at least one of the two or more thermoplastic resin molded body materials having a welded portion in at least one thermoplastic resin molded body material . Thermoplastic resin in which two or more thermoplastic resin molding materials are welded by bringing the welding portion and the thermoplastic resin molding material or two or more welding portions into contact with each other after heat-softening the welding portion In the method of welding a molded body material , an electric heating element that forms a wire shape and extends in a three-dimensional manner facing the welding portion and generates heat by energization, or the thermoplastic resin molded body material is used. This causes the energization heating element to approach or abut against the welded portion to heat the welded portion, so that the welded portion of the molded product material can be heated appropriately and softened. Excellent Has a practical effect.
[Brief description of the drawings]
FIG. 1 is a schematic front view showing an embodiment of a molding material welding apparatus to which the present invention is applied.
FIG. 2 is an enlarged detail view of various embodiments according to the main part of FIG.
FIG. 3 is an enlarged detail view of various embodiments according to the main part of FIG. 1;
4 is an enlarged detail view of another embodiment according to the main part of FIG.
[Explanation of symbols]
9 Current-carrying heating element 10; 11 Holding member

Claims (7)

At least one thermoplastic resin molding material having at least one thermoplastic resin molding material having at least one thermoplastic resin molding material , heat-softening the welding portion in at least one thermoplastic resin molding material, and in the thermoplastic resin molded body material or two or more of the welded portion welding a thermoplastic resin molded body material for welding two or more of the thermoplastic resin molded body material with each other it is brought into contact with,
An electric heating element that forms a wire shape and extends in a three-dimensional manner facing the welded portion and generates heat when energized, or the thermoplastic resin molded body material is moved. A method for welding a thermoplastic resin molded body material , wherein an energized heating element is brought close to or in contact with the welded portion to heat the welded portion. In the welding method of the thermoplastic resin molded material according to claim 1,
A thermoplastic resin molded body material characterized in that the energization heating element is held by a holding means which can be buried in a required length in the diameter direction and has a groove for maintaining the energization heating element in a required shape. Welding method. In the welding method of the thermoplastic resin molded body material according to claim 1 or 2,
A method of welding a thermoplastic resin molded body material , characterized in that an energization heating element having an absorption part for absorbing thermal expansion is brought close to or in contact with the welding part. At least one thermoplastic resin molding material having at least one thermoplastic resin molding material having at least one thermoplastic resin molding material , heat-softening the welding portion in at least one thermoplastic resin molding material, and in welding device for thermoplastic resin molded body material for welding two or more thermoplastic resin molded material and the thermoplastic resin molded body material or abut two or more of the welded portions,
The heating element that heats and softens the welded portion is constituted by an energized heating element that generates heat when energized, forms a wire shape and extends three-dimensionally facing the welded portion, and is extended by thermal expansion. On the other hand, it is held by a holding member to maintain a required shape, and further, the heating element advances relative to the welding part, or the welding part advances relative to the heating element, A welding apparatus for a thermoplastic resin molded material , which heats the welded part by approaching or abutting the welded part. In the welding apparatus of the thermoplastic resin molded body material according to claim 4,
The thermoplastic resin molded body material welding device, wherein the holding member has a groove capable of burying the energization heating element in a required length in the diameter direction and maintaining the required shape. In the welding apparatus of the thermoplastic resin molded body material according to claim 4 or 5,
The welding device for thermoplastic resin molded material , wherein the energization heating element has an absorption part for absorbing thermal expansion. In the welding apparatus of the thermoplastic resin molded material according to at least one of claims 4 to 6,
The welding device for thermoplastic resin molded material , wherein the energization heating element is a wire material having a diameter of 2 to 6 mm.

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