JP2015093482A - Bonding method of carbon fiber-reinforced thermoplastic resin member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bonding method that bonds carbon fiber-reinforced thermoplastic resin members, simply, regardless of the weld position and the shape of a bonding object.SOLUTION: A conductive needle 28 is penetrated through a bonding part 24 in which a first member 20 and a second member 20, comprising carbon fiber-reinforced thermoplastic resin as a main material, are laminated. The conductive needle 28 is electrified and the first member 20 and second member 22 are heated to be welded together.

Description

  The present invention relates to a method for joining carbon fiber reinforced thermoplastic resin members.

  Conventionally, as a method for joining carbon fiber reinforced thermoplastic resin composites, resistance welding is known in which welding is performed using heat generated by the electrical resistance of a resistance heating element. For example, in Patent Document 1, a resistance heating element provided with an insulating layer is disposed between a pair of joined objects, and the resistance heating element is energized for bonding. The energization is performed by causing the resistance heating element to protrude from between the pair of joints and using the protruding portion as a terminal.

JP 2012-016867 A

  However, in Patent Document 1, as described above, the resistance heating element protrudes from between the pair of joints, and electricity is supplied using the protruding portion as a terminal. Therefore, it is difficult to protrude the resistance heating element. If the position is complicated or the shape of the joint becomes complicated, welding becomes difficult. In particular, in the case of a carbon fiber reinforced thermoplastic resin member, since the degree of freedom of shape is high by injection molding or the like and can cope with any shape, there is a high demand for joining regardless of the shape of the member to be joined.

  The present invention has been made in view of the above facts, and an object of the present invention is to obtain a joining method for simply joining carbon fiber reinforced thermoplastic resin members regardless of the welding position and the shape of the joined article.

  The method for joining carbon fiber reinforced thermoplastic resin members according to the present invention allows a conductive needle to pass through a joint portion in which a first member and a second member mainly made of carbon fiber reinforced thermoplastic resin are overlapped, The conductive needle is energized, and the first member and the second member are heated and welded.

  In the method for joining carbon fiber reinforced thermoplastic resin members according to the present invention, a conductive needle is passed through the joint portion between the first member and the second member to be joined, and the conductive needle passed therethrough is energized. The conductive needle only needs to be able to penetrate the joint, and can be easily driven regardless of the position and shape of the first member and the second member. By energizing the conductive needle thus driven, the vicinity of the conductive needle at the joint is heated and melted and joined.

  According to the joining method of the carbon fiber reinforced thermoplastic resin member according to the first aspect of the present invention, the carbon fiber reinforced thermoplastic resin member can be easily joined regardless of the welding position or the shape of the joined article. .

(A) is sectional drawing which shows the junction part of the 1st member joined by the joining method of the carbon fiber reinforced thermoplastic resin member which concerns on 1st Embodiment, and a 2nd member, (B) is a resistance welding machine. It is a figure which shows the state which is supplying with electricity to 1 electroconductive needle | hook. It is sectional drawing which shows the modification of the driving | running | working aspect of the conductive needle in 1st Embodiment. (A) is the schematic of the resistance welder used by 2nd Embodiment, (B) is a figure which shows the state currently welded with the resistance welder of (A).

[First Embodiment]
A method for joining carbon fiber reinforced thermoplastic resin members according to the first embodiment of the present invention will be described with reference to FIGS.

  FIG. 1A shows a part of the first member 20 and the second member 22 joined by the carbon fiber reinforced thermoplastic resin member joining method according to the present embodiment. The 1st member 20 and the 2nd member 22 are made into plate shape, and are formed with the carbon fiber reinforced thermoplastic resin (CFRP). In this embodiment, the case where the 1st member 20 and the 2nd member 22 are plate-shaped is demonstrated to an example, However, The member used as joining object does not necessarily need to be plate-shaped.

  The procedure for joining the first member 20 and the second member 22 is as follows.

  First, the 1st member 20 and the 2nd member 22 are piled up, and the junction part 24 with which both overlap is formed. Then, the conductive needle 28 is driven in advance at a position where both are welded in the joint portion 24. At this time, the conductive needle 28 penetrates the first member 20 and the second member 22, and the end portions 28 </ b> A and 28 </ b> B are arranged to be exposed on the outer surface of the joint portion 24. That is, the end portions 28 </ b> A and 28 </ b> B are disposed flush with the outer surface of the joint portion 24, or are disposed so as to protrude from the joint portion 24. The end portions 28A and 28B are used as terminals for energization. The length of the conductive needle 28 is set to a length equal to or greater than the total thickness of the first member 20 and the second member 22.

  As the conductive needle 28, a conductive member is used, but a metal member is preferable. For example, a steel material, a copper material, an iron material, or the like can be used. Further, as shown in FIG. 1 (A), the conductive needle 28 may be driven in a straight line including the end portions 28A and 28B, or the end portions 28A and 28B may be arranged on a plate. You may bend along a plane. By bending the end portions 28 </ b> A and 28 </ b> B along the plate surface, the conductive needle 28 can be reliably exposed from the outer surface of the joint portion 24. In addition, as shown in FIG. 2, a U-shaped (U-shaped) conductive needle 28 -U may be used, and a single conductive needle may be driven so as to penetrate two locations of the joint portion 24. . By making the conductive needle into such a shape, a wider range can be efficiently heated, and the welding range can be expanded.

  Next, the electrodes 14A and 14B of the resistance welder 12 are brought into contact with the end portions 28A and 28B, and the joining portion 24 is sandwiched and pressed. A voltage is applied between the electrodes 14A and 14B. As a result, the current flows between the electrodes 14 </ b> A and 14 </ b> B stably via the conductive needle 28 without spreading the current over a wide range of the first member 20 and the second member 22. Then, due to the electrical resistance of the conductive needle 28, the first member 20 and the second member 22 are heated around the conductive needle 28, melted, and welded together. Note that the heating temperature and time and the pressure level and time are appropriately set according to the melting point and thickness of the first member 20 and the second member 22 and the required bonding strength.

  In the present embodiment, the conductive needle 28 is driven into the joint portion 24 between the first member 20 and the second member 22, and both ends thereof are used as terminals for energization. Therefore, it is possible to easily energize the joint 24 regardless of the shapes and welding positions of the first member 20 and the second member 22. Thereby, the 1st member 20 and the 2nd member 22 can be welded and joined easily.

  Moreover, in this embodiment, the existing one for steel plate spot welding can be used as the resistance welder 12. Therefore, the 1st member 20 and the 2nd member 22 can be joined easily using an existing installation and a production line, without requiring a special apparatus.

[Second Embodiment]
Next, a second embodiment of the present invention will be described. In the present embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  FIG. 3A shows a resistance welder 30 used in this embodiment. A conductive perforation needle 34 is formed at the tip of one electrode 32 </ b> A of the resistance welder 30. The conductive perforation needle 34 has a needle shape with a tapered tip. A needle receiving hole 36 is formed in the other electrode 32B. The needle receiving hole 36 has a shape in which the conductive perforating needle 34 can be fitted.

  The procedure for joining the first member 20 and the second member 22 is as follows.

  First, the 1st member 20 and the 2nd member 22 are piled up, and the junction part 24 with which both overlap is formed. Then, the position where the two are welded in the joint portion 24 is sandwiched between the electrodes 32A and 32B of the resistance welding machine 30 and pressed, and the conductive punch needle 34 is driven through the joint portion 24 so as to penetrate. The tip is inserted into the needle receiving hole 36 (see FIG. 3B). In this state, a current is passed between the electrodes 32A and 32B of the resistance welder 30. Then, the first member 20 and the second member 22 are heated and melted around the conductive piercing needle 34. After a predetermined time has elapsed, the conductive perforation needle 34 is extracted from the joint 24. As a result, the first member 20 and the second member 22 are welded to each other at the portion where the conductive piercing needle 34 has been driven and the periphery thereof. As in the first embodiment, the heating temperature and time, and the pressure level and time are appropriately set according to the melting point and thickness of the first member 20 and the second member 22 and the required bonding strength. .

  In the present embodiment, the conductive punch 34 formed on the electrode 32A of the resistance welder 30 is driven into the joint 24 between the first member 20 and the second member 22 to energize it. Therefore, it is possible to easily energize the joint 24 regardless of the shapes and welding positions of the first member 20 and the second member 22. Thereby, the 1st member 20 and the 2nd member 22 can be simply joined by welding. Moreover, in this embodiment, since it is not necessary to drive in in advance a conductive needle, the joining process can be simplified.

  In addition, the joining method of the carbon fiber reinforced thermoplastic resin member according to the present invention can be suitably used for automobile assembly, manufacturing process, aircraft assembly, manufacturing process and the like using the carbon fiber reinforced thermoplastic resin member. .

20 First member 22 Second member 24 Joint portion 28 Conductive needle 34 Conductive perforation needle

Claims (1)

Conductive needles are passed through the joint where the first member and the second member made of carbon fiber reinforced thermoplastic resin as a main material are overlapped,
A method for joining carbon fiber reinforced thermoplastic resin members, wherein the conductive needle is energized and the first member and the second member are heated and welded.

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