JPH0822723A - Manufacture of lead wire - Google Patents

Abstract

PURPOSE:To provide a lead wire manufacturing method to obtain a lead wire whose insulation quality is high in the lead wire manufacturing method to work the lead wire of an electronic part. CONSTITUTION:A manufacturing method is provided in such a way that squeezing work to squeeze an outside diameter is performed by a punch 13 of a squeezing unit 5 so that a lead wire raw material 1 becomes a wedge shape over the whole circumference and next, the vicinity of this squeezing work part is crushed in a prescribed thickness by the same upper die with a crushing lower die 10 of a crushing part 6 and is formed in a flat plate shape and the narrowest part formed in the wedge shape of this press work part is cut by a fixed edge 12 and a movable edge 11 of a cutting unit part 8 and a lead wire 2 is obtained. Therefore, a tip part of the lead wire 2 can be formed in a chamfer shape without generating cutting chips, and quality to insulation of an electronic part round which a conductor is wound while interposing an insulating material between them can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a lead wire for processing a lead wire used in an electronic component in which a conductor is wound with an insulator interposed therebetween.

[0002]

2. Description of the Related Art Conventionally, a method of manufacturing a lead wire for forming a flat portion for crushing a lead wire material and welding it to a foil is shown in FIG. 4 and FIG. The lead wire material 1 is crushed to a predetermined thickness by applying pressure by the crushing lower die 10 and the crushing upper die 9 which moves up and down to form the lead wire processed product 3A shown in FIG. The lead wire processed product 3A was sent to the process and cut by the fixed blade 12 of the cutting unit 8 and the movable blade 11 that moves up and down to obtain the lead wire 4 having a desired shape and dimension.

[0003]

However, in such a conventional lead wire manufacturing method, as shown in FIG. 6, the cut lead wire 4 and the conductor 14 are joined and wound via the insulator 15. In this case, there has been a problem that concentrated stress is applied to the cutting edge portion which is the end portion of the cutting portion of the lead wire 4, and the insulator 15 is damaged.

Further, it is conceivable to make the tip shape into a chamfered shape in order to relieve the stress at the cutting edge portion, but in this case, cutting chips are generated and a problem occurs due to the inclusion of the cutting chips. Had.

The present invention solves such a conventional problem, and manufactures a lead wire capable of improving the insulation quality of an electronic component in which a conductor is wound with an insulator interposed therebetween. It is an object of the present invention to provide a method for manufacturing a lead wire.

[0006]

In order to solve this problem, a method of manufacturing a lead wire according to the present invention is such that a part of a round bar-shaped lead wire material has an outer diameter so as to have a wedge shape over the entire circumference. A manufacturing method of obtaining a lead wire by performing a narrowing drawing process and then pressing the vicinity of the drawing process into a flat plate shape, and then cutting the wedge-shaped narrowest width part of the pressing process part. It is what

[0007]

According to this method, the tip of the lead wire is chamfered, the stress on the insulator can be reduced, the cutting waste is not caught, and the electronic parts of the conductor are wound. The quality for insulation can be improved.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a process chart showing the lead wire processing. In FIG. 1, 5 is a drawing unit for drawing the lead wire material 1, and 6 is a lead wire drawn by the drawing unit 5. A crushing unit portion for crushing the processed product 1A, a cutting unit portion 8 for cutting the crushed lead wire processed product 1B, and a feeding unit portion 7 for feeding a lead wire.

FIG. 2 is a perspective view showing a processed state of the lead wire, and FIG. 3 is a perspective view of an essential part showing a state in which a conductor joined to the lead wire is wound around an insulator.

The method of manufacturing the lead wire according to the present invention will be described below. First, by drawing the lead wire material 1 with the punch 13 of the drawing unit section 5 from the vertical and horizontal directions, the drawing process is performed to narrow the outer diameter so as to form a wedge shape over the entire circumference as shown in FIG. 2B. The lead wire processed product 1A is formed by applying the pressure to the lead wire processed product 1A by the crushing lower mold 10 and the vertically moving crushing upper mold 9 of the crushing unit 6 to obtain the shape of the lead wire processed product 1A. A flat plate having a predetermined thickness is crushed to form a lead wire processed product 1B as shown in FIG. 2C, which is processed by the fixed blade 12 of the cutting unit 8 and the movable blade 11 which moves up and down. As shown in FIG. 2 (d), the product 1B is drawn and cut at the narrowest width, which is a wedge-shaped part.
The shape of the lead wire 2 shown in FIG.

Further, all the lead wire feeding here is performed by the feeding unit section 7. If the lead wire is processed using such a method, the lead wire 2 cut by the fixed blade 12 and the movable blade 11 in the cutting unit portion 8 will be described.
2D has a chamfered shape as shown in FIG. 2D, the lead wire 2 and the conductor 14 are joined to each other as shown in FIG. 3 and wound around the insulator 15. The stress at the cutting edge can be reduced.

Therefore, by adding the drawing unit portion 5 to the conventional lead wire processing step, the tip end of the lead wire 2 can be chamfered without generating cutting waste, and the cutting waste during winding. It is possible to improve the quality by eliminating the damage of the insulator due to the entrainment and the stress concentration.

[0014]

As described above, in the method of manufacturing a lead wire according to the present invention, a part of a round bar-shaped lead wire material is subjected to a drawing process in which the outer diameter is narrowed down so as to form a wedge shape over the entire circumference. By rolling and cutting, the connecting part of the lead wire with the conductor becomes chamfered, so stress concentration is softened, damage to the insulator is eliminated, and cutting waste is not entrained during winding to improve quality. Is something that can be done.

[Brief description of drawings]

FIG. 1 is a manufacturing process chart showing a method of manufacturing a lead wire according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a processed state of the lead wire.

FIG. 3 is a perspective view of an essential part showing a state in which a conductor joined to a lead wire obtained in the example is wound around an insulator.

FIG. 4 is a manufacturing process diagram showing a conventional lead wire manufacturing method.

FIG. 5 is a perspective view showing a processed state of the lead wire.

FIG. 6 is a perspective view of a main part showing a state in which a conventional conductor to which lead wires are joined is wound around an insulator.

[Explanation of symbols]

 1 Lead wire material 1A, 1B Processed lead wire 2 Lead wire 5 Drawing unit 6 Crushing unit 7 Feeding unit 8 Cutting unit 9 Crushing upper mold 10 Crushing lower mold 11 Movable blade 12 Fixed blade 13 Punch 14 Conductor 15 Insulation Stuff

Continued Front Page (72) Takahide Yamashina 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (1)

[Claims] 1. A round bar-shaped lead wire material is subjected to a drawing process in which the outer diameter is narrowed down so as to form a wedge shape over the entire circumference, and then the vicinity of the drawn part is pressed into a flat plate shape. After that, a method of manufacturing a lead wire, in which the wedge-shaped narrowest width portion of the pressed portion is cut to obtain a lead wire.