JP4187513B2 - Coated wire welding method and pre-soldering method for coated wire - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention mainly relates to a coated wire welding method suitable for processing a coated wire of an industrial electronic component or an electronic component for home appliance, and a pre-soldering method for the coated wire.
[0002]
[Prior art]
As a conventional method for bonding a covered wire such as a magnet wire, welding bonding or solder bonding is generally used. In joining these coated wires, it is necessary to remove the insulating coating material covering the core wire in advance, but the method of removing the coating material differs depending on the heat resistance characteristics of the coating material.
[0003]
When the insulating coating material is thermoplastic, the coating material can be easily melted and peeled off by heating. Generally, in welding joining, the covering material is melted and removed by pressurization of a heated heater chip. For example, it is described in the product catalog of the inverter type welding power source of Avionics Co., Ltd.
[0004]
FIG. 6 is an explanatory diagram of a conventional covered wire welding method. In FIG. 6, 1a is a heater chip and upper welding electrode, 2a is a covered wire, 3a is a plate to be welded, and 4a is a lower electrode. The insulating coating 5a is melted and removed by energization heating of the heater tip / upper welding electrode 1a by the coating peeling power supply 6 and pressurization to the coated wire 2a. Immediately after the conduction from the heater tip / upper welding electrode 1a to the lower electrode 4a is ensured, a welding current is passed between the upper and lower electrodes from the welding power source equipment 7a to weld the covered wire 2a and the plate material 3a to be welded.
[0005]
FIG. 7 is an explanatory view showing a conventional pre-soldering method for coated wires. When preliminarily soldering the coated wire, a method of immersing the coated wire 2 in a solder bath 8 as shown in FIG. 7 is used. The solder tank 8 is filled with the melted solder 9, and the insulating coating material 5 is melted by the heat of the solder 9, and the solder is fixed to the exposed core wire 10.
[0006]
When the insulating coating material is a heat resistant material, it is difficult to remove the insulating coating material by heating. Therefore, welding and pre-soldering are performed for the joining of the covered wire after the removal of the covering material by cutting or melting by chemicals.
[0007]
[Problems to be solved by the invention]
In the conventional method for joining coated wires, it is necessary to change the removal method depending on the heat resistance characteristics of the insulating coating material. In the case of a thermoplastic insulating coating material, although the coating material can be easily melted and removed, a preheating facility for the heater chip is required, and the configuration of the facility becomes complicated and expensive.
[0008]
Moreover, although the thermocouple for temperature measurement is attached to the heater chip by welding, the welded portion is fatigued and destroyed due to the preheating temperature cycle, and the thermocouple is peeled off. For this reason, it is necessary to frequently replace the heater chip, and the welding cost is increased as compared with normal welding. In the case of a heat-resistant insulating coating material, the coating material is removed by cutting or melting with chemicals. These methods of removing the covering material need to take into consideration the generation of cutting waste, cutting blade replacement, solvent management, waste liquid treatment, and the like, leading to an increase in cost.
[0009]
An object of the present invention is to provide a coated wire welding method and a pre-soldering method for a coated wire that reduce the bonding cost of the coated wire.
[0010]
[Means for Solving the Problems]
The present invention is a pre-soldering method for a coated wire that crushes the coated wire, causes a crack in the insulating coating material, and is immersed in a solder bath.
[0013]
Moreover, in the pre-soldering method of the covered wire by covering wire crushing, it is a pre-soldering method of the covered wire in which the thickness of the covered wire after crushing is 60% or less of the thickness before crushing.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
The covered wire joining method and the covered wire pre-solder method according to the embodiment of the present invention will be described below.
[0015]
FIG. 1 is an explanatory view showing a covered wire welding method according to an embodiment of the present invention. In FIG. 1, 1 is an upper welding electrode, 2 is a covered wire, 3 is a plate material to be welded, and 4 is a lower electrode. The covered wire 2 is crushed in advance, and the insulating covering material 5 is cracked. Immediately after the upper welding electrode 1 is in close contact with the covered wire 2 and the conduction from the upper welding electrode 1 to the lower electrode 4 is ensured, a welding current is passed between the upper and lower electrodes from the welding power source equipment 7 and the covered wire 2 and the covered wire 2 are covered. The welding plate material 3 is welded.
[0016]
FIG. 2 is an explanatory view showing a method for crushing a covered wire according to an embodiment of the present invention. In FIG. 2, when the covered wire 2 on the base plate 12 is crushed by the load head 11, a crack 13 is generated in the insulating coating material 5 of the covered wire 2 and the core wire is exposed. The thickness of the crushed portion of the covered wire is crushed from the thickness 14 of the covered wire before crushing to the thickness 15 of the covered wire after crushing, and at the same time, the core wire is plastically deformed in the width direction. At this time, a tensile force in the width direction is applied to the covering material, and a crack is formed.
[0017]
FIG. 3 is a distribution diagram showing the relationship between the contact resistance of the covered wire after crushing and the covered wire width. FIG. 4 is a distribution diagram showing the relationship between the thickness ratio of the covered wire after the crushing of the covered wire and the covered wire width. In FIG. 3, the collapsed thickness of the coated wire that obtains the low contact resistance by overlapping the line width region where the contact resistance is stably low and the distribution variation in FIG. 4 is the thickness of the coated wire before the collapse. It can be seen that welding can be reliably performed by setting the ratio to 30% or less. When welding by crushing a covered wire, it is necessary to satisfy the crushing thickness of the covered wire.
[0018]
FIG. 5 is an explanatory diagram when pre-soldering is applied to the flat covered wire 16. As with the round wire, the flat wire 16 is cracked in the insulating covering material due to crushing. When performing preliminary soldering, unlike the case where welding is performed, sufficient soldering is possible by forming a crack in the covered wire reaching the core wire portion. In order to form such cracks in the covered wire, it is necessary to crush the thickness of the covered wire to 60% or less of the thickness of the covered wire before crushing. If the crushing thickness of the covered wire exceeds 60% of the thickness of the covered wire before crushing, cracks in the covered wire may not be formed, and reliable preliminary soldering cannot be performed.
[0019]
Since the heat-resistant insulating coating material is harder and more easily cracked than the thermoplastic insulating coating material, the present invention is particularly effective for removing the heat-resistant insulating coating material. It is. In addition, since the present invention does not generate waste material in the removal of the coated wire, it can solve problems such as processing of cutting waste and chemical waste liquid generated in the conventional coating material removal process.
[0020]
【The invention's effect】
According to the present invention, it is possible to expose the core wire only in the crushing of the coated wire, thereby enabling soldering injuries easily covered wire. It can be applied to both thermoplastic and heat-resistant insulation coating materials, eliminating the need for consumables required for conventional methods of removing coating materials, thus greatly reducing costs and reducing the cost of joining coated wires. It is possible to provide a method for pre-soldering the coated wire to be reduced .
[Brief description of the drawings]
FIG. 1 is an explanatory view showing a coated wire welding method according to an embodiment of the present invention.
FIG. 2 is an explanatory view showing a method for crushing a covered wire according to an embodiment of the present invention.
FIG. 3 is a distribution diagram showing the relationship between the contact resistance after crushing of a covered wire and the width of the covered wire.
FIG. 4 is a distribution diagram showing the relationship between the coated wire thickness ratio after crushing of the coated wire and the width of the coated wire.
FIG. 5 is an explanatory view showing a preliminary soldering method according to an embodiment of the present invention.
FIG. 6 is an explanatory view showing a conventional covered wire welding method.
FIG. 7 is an explanatory view showing a pre-soldering method for a covered wire of a conventional covered wire.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Upper welding electrode 1a Heater tip / upper welding electrode 2, 2a Covered wire 3, 3a Welded plate material 4, 4a Lower electrode 5, 5a Insulation coating material 6 Stripping power supply equipment 7, 7a Welding power supply equipment 8 Solder tank 9 Solder 10 Core wire 11 Weighted head 12 Base plate 13 Crack 14 Thickness of covered wire 15 before crushing 15 Thickness of coated wire after crushing 16 Rectangular covered wire

Claims (2)

A method for pre-soldering a coated wire, comprising crushing the coated wire, causing a crack in the insulating coating material, and immersing the coated wire in a solder bath. 2. The method for pre-soldering a covered wire by crushing the covered wire according to claim 1, wherein the thickness of the covered wire after crushing is 60% or less of the thickness before crushing. .

Images