JPH05268711A - Film peeling method of insulation coated wire - Google Patents

Abstract

PURPOSE:To peel off the insulation film of a magnet wire safely and easily. CONSTITUTION:Liquid nitrogen 2 is put in a container 1, and a magnet wire 3 is put on bending rollers 6 in a zigzag direction to move. The insulation film of the magnet wire 3 is cooled to lose its flexibility, so that it can not follow the bending of a conductor of the magnet wire caused by bending operation of the bending rollers 6 and is cracked to peel off.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is for connecting an end of an insulating film electric wire (hereinafter referred to as a magnet wire) such as an enameled wire used for electric equipment so as to conduct electricity to another conductor. , A method of peeling off the insulating film.

[0002]

2. Description of the Related Art Conventionally, a method for removing an insulating film of a magnet wire is a chemical method disclosed in Japanese Patent Laid-Open No. 56-112629, a brush method disclosed in Japanese Patent Laid-Open No. 60-13409, and a special method. The electrochemical method disclosed in JP-A-56-35612 and JP-A-62-15571
There is a mechanical method disclosed in Japanese Patent No. As one example of these, the method disclosed in Japanese Patent Laid-Open No. 56-112629 will be described with reference to FIG.

A cut line 11 for removing the insulating film 14 is removed by a razor or the like by a length necessary for the extended portion of the enameled wire 13 which has been extended by about 1 to 10% with respect to the entire length in advance. Immerse in sulfuric acid 12. 2-1 in this state
After 0 minutes, the insulating film 14 on the end portion of the enamel wire 13 is completely removed from the conductor wire of the enamel wire 13.

In general, magnet wires are used for windings of electromagnetic coils, alternators, starter motors, general-purpose motors, etc., and therefore are bent at high speed and violently in the manufacturing process. At this time, a soft coating material having a low elastic modulus is used so that the conductor wire and the insulating coating are not separated. Even if such a soft coating material is mechanically peeled from the outside, it takes a considerable time for peeling because it is sticky.

Furthermore, with the recent increase in voltage and size of electric equipment, the diameter of magnet wire has been reduced to 40 nm,
The tensile strength of the magnet wire itself is only about 1kg,
It has become difficult to mechanically remove the insulating film.
Therefore, as a conventional method, a chemical method using chemicals is used as a method of peeling the insulating film without applying a force to the conductor wire.

[0006]

Since the conventional method for removing the film of the magnet wire employs a chemical method using an acid or alkali solution, it can be applied to, for example, polyamide wire or polyamide-imide wire having strong chemical resistance. When applied, there is a problem that it is difficult to easily peel off the insulating film.

Recently, magnet wires having particularly high heat resistance have been demanded, and polyimide wires and polyamide-imide wires have come to be used in large amounts in this respect for alternators and starter motors which are electric components for automobiles. It was
However, since there is no method for easily peeling off the insulating film of these magnet wires, there is a problem that their use leads to a decrease in productivity.

The present invention has been made in order to solve the above problems and provides a magnet wire which can easily and safely remove an insulating film regardless of the mechanical strength of the insulating film or the conductor wire. It is an object to provide a film peeling method.

[0009]

According to the method of removing a film of a magnet wire of the present invention, the magnet wire is cooled to a temperature at which the insulating film of the magnet wire loses flexibility, and the conductor wire of the magnet wire is cooled in this cooling state. It is bent or extended, or a mechanical impact force is applied.

[0010]

According to the method of stripping the coating film of the magnet wire in the present invention, the insulating coating film of the magnet wire loses flexibility and becomes hard and brittle when cooled, and when it is bent or extended or a mechanical impact force is applied in this state, insulation is obtained. The coating finely cracks and separates from the conductor wire.

[0011]

Embodiments of the present invention will now be described with reference to the drawings, in which the same or corresponding parts are designated by the same reference numerals.

Embodiment 1. In FIG. 1, 1 is a container for containing a highly heat-insulating liquid, 2 is liquid nitrogen for containing the magnet wire 3 in the container 1, and 3 is excellent in heat resistance and chemical resistance, for example, on a copper wire surface. Has a polyamide film,
A magnet wire having a diameter of 1 mm, for example, 4 is an inlet roller for introducing the magnet wire 3 into the container 1, and 5 is an outlet roller for drawing out the magnet wire 3 from the container 1. 6 is rotatably provided in the liquid nitrogen 2 in the container 1, and in order to bend and pass the magnet wire 3 in the liquid nitrogen 2, the upper and lower sides are alternately displaced from each other and arranged in a row above and below. A plurality of bending rollers.

Next, the method of the first embodiment will be described with reference to FIG. A winding machine (not shown) in which the magnet wire 3 is hung on the inlet roller 4, and then is hung on the plurality of bending rollers 6 in a meandering manner, and finally passes through the outlet roller 5 and is driven by a motor or the like. Connect to. In this state, the liquid nitrogen 2 is put into the container 1 at least until the bending roller 6 is completely immersed.

The bending roller 6 and the magnet wire 3 hung on the bending roller 6 are cooled to the liquid nitrogen temperature (-196 ° C.). While maintaining this state, the winder (not shown) is moved to move the magnet wire 3 from the entrance roller 4 to the exit roller 5 via the bending roller 6 at a speed of 1 m / sec.

Since the insulating coating such as a polyamide coating of the magnet wire 3 is cooled to -196 ° C. by the liquid nitrogen 2, it becomes inflexible, hard and brittle. On the other hand, since the conductor wire of the magnet wire 3 is a metal such as a copper wire, it does not lose elasticity like an insulating film and bends along the outer diameter of the bending roller 6. As a result, the insulating coating of the magnet wire 3 that has lost rubber elasticity cannot be bent along with the conductor wire along the outer diameter of the bending roller 6, and the magnet wire 3 on the side not in contact with the bending roller 6 The insulating film of is cracked finely and peels off from the conductor wire.

Further, the magnet wire 3 advances to the next bending roller 6 and is bent in the same manner. At this time, due to the arrangement of the bending roller 6, the bending roller 6 is bent in the opposite direction to the previous step. The insulating coating on the opposite side of the insulating coating of the magnet wire 3 that could not be peeled off in the previous step is peeled off at this bending roller 6. Since the magnet wire 3 continues to move further, it is bent alternately by the number of bending rollers 6 eight times in this embodiment. Therefore, the magnet wire 3
Even if there is an insulating film that could not be peeled off by bending once, since it can be bent many times, at the time of passing through the outlet roller 5, only the conductor wire in which the insulating film is completely peeled off is left.

Embodiment 2. Although the bending rollers 6 are arranged on the same plane in the first embodiment, it is necessary to change the angle of each bending roller in order to remove the insulating coating of the magnet wire efficiently and completely. The direction of the rotation axis of the next bending roller is sequentially shifted by 45 degrees with respect to the direction of the rotation axis of the second bending roller, and the bending roller is placed at a position where the direction of the rotation axis of the last bending roller rotates 360 °. Just place it.

With this configuration, the insulating coating of the magnet wire is shifted from the first bending roller by 90 degrees every second passing through the bending roller, and the insulating film on the second bending roller is separated from the first bending roller. It is peeled one by one from the bending roller, and is peeled to the direction side of every 90 degrees from the direction side 45 degrees away from the side opposite to the peeling side of the first bending roller. In total, the insulation film is peeled off at 360 degrees, that is, the entire circumference.

Needless to say, depending on the type of the insulating film, the number of the bending rollers, the moving speed of the magnet wire, and the cooling temperature can be changed to achieve the most efficient and efficient peeling of the insulating film.

Example 3. In FIG. 2, reference numeral 7 is a rod having one end fixed to the inner surface of the container 1 so as to be horizontally arranged in the container 1 and having a diameter slightly smaller than the inner diameter of the magnet wire 3 wound in a coil shape, for example 6 mm in diameter.

First, a coil is formed by winding the end portion of the magnet wire 3 about 10 times in a flexible state so that the inner diameter is slightly larger than the diameter of the rod 7. Next, add liquid nitrogen 2 to the extent that the rod 7 is sufficiently immersed in the container 1,
Cool rod 7 to -196 ° C. Next, as shown in FIG. 2, the magnet wire 3 wound in a coil is placed in liquid nitrogen 2
Then, insert it into the rod 7 so that the rod 7 is inserted.

The magnet wire 3 in the liquid nitrogen 2 is also cooled to -196 ° C., and the insulating film loses rubber elasticity and becomes hard and brittle. In this state, the magnet wire 3 is quickly pulled up so as to be ejected from the liquid nitrogen 2. As a result, the coil-shaped portion of the magnet wire 3 is linearized while rotating around the rod 7, and the curved portion on the pulled-up side is linearly extended. At this time, the insulating coating on that portion of the magnet wire 3 cannot follow the deformation of the extension of the conductor wire, and is peeled off one after another from the conductor wire while cracking.

Example 4. Instead of pulling up the magnet wire 3 as in the third embodiment, the rod 7 is rotatably provided in the liquid nitrogen 2 and the magnet wire 3 is wound around the rod 7 to obtain the same effect as in the third embodiment.

Example 5. In FIG. 3, 8 is an insulating film of the magnet wire 3, such as a polyimide film,
Reference numeral 9 is a conductor wire of the magnet wire 3 such as copper wire, and 10 is the magnet wire 3 from both sides in the container 1.
It is a pair of pinch rollers that are pressed inward with a force of 0 kg and can rotate freely.

First, the liquid nitrogen 2 is put into the container 1 to such an extent that the pinch roller 10 is sufficiently immersed, and the pinch roller 10
Is cooled to -196 ° C. Next, the portion of the magnet wire 3 from which the insulating film 8 is to be peeled off is put into the liquid nitrogen 2, sandwiched between the pinch rollers 10 and tightened. In this state, when the magnet wire 3 is cooled to −196 ° C., the magnet wire 3 is quickly pulled up in the direction of pulling it out of the liquid nitrogen 2.

Since the magnet wire 3 is clamped by the pinch roller 10, when passing through the pinch roller 10, the insulating film 8 at that portion is deformed and cracked and peeled from the conductor wire 9. At this time, the pinch roller 10
When the tightening force is strong, the magnet wire 3 extends when it is pulled up. As a result, the conductor wire 9 extends, but the insulating film 8 cannot follow this deformation, and an extension force is applied to the conductor film 9, which causes the conductor wire 9 to be finely cracked and more easily separated from the conductor wire 9.

In the fifth embodiment, as shown in FIG. 3, a pair of pinch rollers 10 is provided. However, in order to remove the insulating film more efficiently, the entire 360 degrees around the magnet wire can be pressed by the pinch roller. By using a large number of pinch rollers, the insulating film can be peeled off in a single operation.

In each of the above embodiments, liquid nitrogen was used as a means for cooling the magnet wire, but the invention is not limited to this, and liquid helium, dry ice, freon gas or the like may be used. After lowering the temperature of the magnet wire below the temperature at which the insulating film loses flexibility, the magnet wire may be bent, stretched, or mechanically shocked.

Further, in the above-mentioned embodiment, the magnet wire is cooled by putting it in the cooling liquid, but instead of this, even if the magnet wire is cooled by injecting a coolant from a thin nozzle, the same effect as in the above-mentioned embodiment is obtained. can get.

[0030]

As described above, according to the present invention, the insulating film can be easily cooled by cooling it to a temperature at which it does not lose its flexibility and bending or extending in this state or applying a mechanical impact force. Moreover, peeling can be performed without contaminating the surrounding environment, which has the effect of improving productivity.

[Brief description of drawings]

FIG. 1 is an explanatory diagram for explaining a method according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram illustrating a method according to a third embodiment of the present invention.

FIG. 3 is an explanatory diagram for explaining a method according to a fifth embodiment of the present invention.

FIG. 4 is an explanatory diagram for explaining a method of a conventional example.

[Explanation of symbols]

 1 Container 2 Liquid Nitrogen 3 Magnet Wire 6 Bending Roller 7 Rod 8 Insulating Film 9 Conductor Wire 10 Pinch Roller

Claims (1)

[Claims] 1. An insulating film electric wire having an insulating film on the surface of the conductor wire is cooled to a temperature below the temperature at which the insulating film loses flexibility, and in this cooling state, the conductor wire is bent or elongated, or the insulating film is formed. A film peeling method for an insulating film electric wire, which comprises applying a mechanical impact force to the electric wire to separate the insulating film of the above electric wire from the conductor wire.