JP2021088030A - Method for cutting straight-angle conductor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress a film turning by omitting a precut step. A method for cutting a flat conductor is a method for cutting a flat conductor whose surface is covered with an insulating film, and a pair of clampers each having a claw extending toward a first side surface of the flat conductor. A step of moving each of the clampers toward the first side surface in a direction approaching each other and pressing each of the clampers against the flat conductor with a constant load capable of suppressing the misalignment of the flat conductor due to cutting of the flat conductor. At a position separated from each of the clampers in the longitudinal direction of the flat conductor by a certain distance or less that can suppress the turning of the insulating coating, the cutting blade is placed on the second side surface of the zenith of the flat conductor intersecting the first side surface. A step of cutting the flat conductor including the pressing insulating coating is provided. [Selection diagram] Fig. 2

Description

The present invention relates to a method for cutting a flat conductor.

A method for cutting a flat conductor coated with an insulating film is known. In particular, this method for cutting a flat conductor includes a precut step and a cutting step. The precut step is a step of moving a pair of cutting blades in directions close to each other and pressing them against the opposite first side surfaces of the flat conductor to make a cut in the insulating coating so that a part of the conductor of the flat conductor is exposed. The cutting step is a step of cutting the flat conductor by pressing the cutting blade against the second side surface orthogonal to the first side surface of the flat conductor so as to cut out at the cutting line including the exposed area of the conductor by the precut step. As a result, in the cutting step, dragging of the insulating film by the cutting blade is prevented, and turning of the insulating film is suppressed (see, for example, Patent Document 1).

JP-A-2019-110633

As described above, in the precut process, a pair of cutting blades (hereinafter, referred to as precut blades) are pressed against the opposite first side surfaces of the flat conductor. On the other hand, in the cutting step, the cutting blade is pressed against the second side surface orthogonal to the first side surface of the flat conductor. As described above, since the direction in which the precut blade is pressed and the direction in which the cutting blade is pressed are different, the insulation coating is suppressed from being turned over in the cutting step by the two steps of the precut step and the cutting step.

However, in the above-mentioned method for cutting a flat conductor, a precut step is provided before the cutting step, and the number of steps is increasing. An increase in the number of processes may lead to an increase in the number of equipment and an increase in the size of the equipment, which may increase the cost required for the equipment.

Therefore, it is an object of the present invention to omit the precut step and suppress the film turning.

The method for cutting a flat conductor according to the present invention is a method for cutting a flat conductor whose surface is covered with an insulating coating, and is a pair of clampers each having a claw extending toward the opposite first side surface of the flat conductor. A step of moving each of the clampers toward the first side surface in a direction approaching each other and pressing each of the clampers against the flat conductor with a constant load capable of suppressing the misalignment of the flat conductor due to cutting of the flat conductor. At a position separated from each of the clampers in the longitudinal direction of the flat conductor by a certain distance or less that can suppress the turning of the insulating coating, the cutting blade is placed on the second side surface of the zenith of the flat conductor that intersects the first side surface. A step of cutting the flat conductor including the pressing insulating coating is provided.

According to the present invention, the pre-cutting step can be omitted and the film turning can be suppressed.

FIG. 1 is a configuration diagram showing an outline of the configuration of a cutting device. FIG. 2A is a flowchart showing the process of the cutting method according to the embodiment. FIG. 2B is a partially enlarged view near the cutting. 3 (a) to 3 (c) are diagrams for explaining a cutting process of a flat conductor. FIG. 4A is a flowchart showing the process of the cutting method according to the comparative example. FIG. 4B is an example of successful cutting according to a comparative example. FIG. 4C is an example of cutting failure according to a comparative example.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

FIG. 1 is a configuration diagram showing an outline of the configuration of the cutting device 10. The cutting device 10 is a device that cuts the flat conductor 30. The flat conductor 30 includes a rod-shaped or linear conductor 31 having a rectangular cross section, and an insulating coating 32 that covers the surface of the conductor 31. A highly conductive metal such as copper is used for the conductor 31. A resin such as enamel is used for the insulating film 32. In the following description, the X-axis positive direction shown in FIG. 1 will be referred to as front, the Y-axis positive direction will be referred to as left, and the Z-axis positive direction will be referred to as top. Therefore, the negative direction of the X-axis can be specified as the back, the negative direction of the Y-axis as the right, and the negative direction of the Z-axis as the bottom.

The cutting device 10 includes a punch 11 and a pair of clampers 15 and 16. The punch 11 has a cutting blade 12 on the back surface, and a part of the cutting edge of the cutting blade 12 is curved and recessed in a substantially U shape on the front surface of the punch 11. The pair of clampers 15 and 16 are devices that clamp (fix) the flat conductor 30 by sandwiching it from the left and right. Here, each of the pair of clampers 15 and 16 includes claws 17 and 18 extending toward the two opposite first side surfaces of the flat conductor 30 (hereinafter referred to as biting claws). The biting claws 17 and 18 have the same height as the clampers 15 and 16, and are formed at the front portions of the clampers 15 and 16. The front surfaces of the biting claws 17 and 18 and the front surfaces of the clampers 15 and 16 other than the biting claws 17 and 18 (hereinafter, both are referred to as the main body portion) may be horizontal, and there may be a step. There may be.

The cutting device 10 carries in the flat conductor 30 by a transport device (not shown). The cutting device 10 moves the punch 11 downward while clamping the carried-in flat conductor 30 from the left and right by a pair of clampers 15 and 16, and causes the cutting edge of the cutting blade 12 to be the second side surface of the zenith of the flat conductor 30. Press against. Then, the cutting device 10 further moves the punch 11 downward from the state where the cutting edge of the cutting blade 12 is pressed against the second side surface, and cuts the flat conductor 30 including the insulating coating 32. As a result, the insulating coating 32 is removed together with a part of the conductor 31, and the rest of the conductor 31 is exposed. As a result, the insulating coating 32 is peeled from the flat conductor 30.

FIG. 2A is a flowchart showing the process of the cutting method according to the embodiment. FIG. 2B is a partially enlarged view near the cutting. In FIG. 2B, the right half of the cutting device 10 and the flat conductor 30 is omitted.

First, as shown in FIG. 2A, the cutting device 10 presses the clampers 15 and 16 against the flat conductor 30 (step S1). More specifically, the cutting device 10 moves each of the pair of clampers 15 and 16 toward the left and right first side surfaces of the flat conductor 30 in a direction approaching each other, and each of the clampers 15 and 16 is used to cut the flat conductor 30. The flat conductor 30 is pressed against the flat conductor 30 with a constant load that can suppress the misalignment of the flat conductor 30.

For example, the constant load is a second load larger than the first load obtained by multiplying the cutting load of the cutting blade 12 by a coefficient corresponding to the rake angle of the cutting blade 12. More specifically, the cutting device 10 presses each of the clampers 15 and 16 with a second load satisfying the following inequality (1).
<Inequality>
2nd load> 1st load (= cutting load x sin (rake angle of cutting blade 12)) ... (1)

Since the clampers 15 and 16 are provided with biting claws 17 and 18, respectively, when each of the clampers 15 and 16 is pressed against the flat conductor 30, the biting claws 17 and 18 bite into the flat conductor 30. As a result, in the case of the clamper 15, as shown in FIG. 2B, the biting claw 17 bites into the insulating coating 32 of the flat conductor 30. The same applies to the clamper 16 as in the case of the clamper 15.

In FIG. 2B, the main body of the clamper 15 is also in contact with the insulating coating 32, but if the tip of the biting claw 17 bites into the insulating coating 32, the cutting device 10 has the main body and the insulating coating. The clamper 15 may be stationary at a distance from 32. That is, a gap may remain between the main body and the insulating coating 32 without the main body and the insulating coating 32 coming into contact with each other. However, if the gap remains, the force of the clamper 15 is supported by the tip of the biting claw 17, and if the insulating coating 32 is cut in this state, the tip of the biting claw 17 may be chipped. Therefore, it is desirable that the main body of the clamper 15 and the insulating coating 32 are in contact with each other.

Next, as shown in FIG. 2A, the cutting device 10 presses the cutting blade 12 against the flat conductor 30 (step S2). More specifically, the cutting device 10 is located at a position separated by a certain distance or less in the longitudinal direction of the flat conductor 30 from the foremost front surface of each of the clampers 15 and 16 in a state where the clampers 15 and 16 are pressed against the flat conductor 30. The cutting blade 12 is pressed against the second side surface of the zenith of the flat conductor 30 intersecting the first side surface. Here, the constant distance is a distance that can suppress the turning of the insulating coating 32. For example, in the case of the clamper 15, as shown in FIG. 2B, the front surface of the clamper 15 and the back surface of the cutting blade 12 Corresponds to the distance D from. The distance D can be appropriately set as long as the turning of the insulating coating 32 can be suppressed. For example, a distance D of several hundredths of a millimeter or less can be adopted.

Next, as shown in FIG. 2A, the cutting device 10 cuts the flat conductor 30 (step S3). That is, as shown in FIG. 2B, the cutting device 10 moves the cutting blade 12 downward (that is, from the front side to the back side of the paper surface) from the state where the cutting blade 12 is pressed against the flat conductor 30, thereby forming the insulating coating 32. Including, the flat conductor 30 is cut. As a result, the insulating coating 32 is removed together with a part of the conductor 31, and the rest of the conductor 31 covered with the insulating coating 32 is exposed. By cutting with the cutting blade 12, the front side of the flat conductor 30 has a shape that follows the shape of the cutting edge of the cutting blade 12. Since each of the clampers 15 and 16 is pressed against the flat conductor 30 with a constant second load larger than the above-mentioned first load and the distance D is a distance capable of suppressing the turning of the insulating coating 32, the dragging of the insulating coating 32 is performed. Is avoided and the coating flipping is suppressed.

3A to 3C are diagrams for explaining a cutting process of the flat conductor 30. First, as shown in FIG. 3A, the flat conductor 30 whose surface of the conductor 31 is covered with the insulating coating 32 is carried into the cutting device 10. When the flat conductor 30 is carried in, the flat conductor 30 is placed between the pair of clampers 15 and 16, and the pair of clampers 15 and 16 are pressed against the opposing first side surfaces of the flat conductor 30 on the short side. As a result, the flat conductor 30 is fixed in a state where the biting claws 17 and 18 of the pair of clampers 15 and 16 bite into the insulating coating 32, respectively.

The punch 11 moves from above to below the flat conductor 30 in a state where the biting claws 17 and 18 bite into the insulating coating 32. As a result, the cutting blade 12 included in the punch 11 is pressed against the flat conductor 30. Since the cutting edge of the cutting blade 12 has a horizontal plane along the back surface of the punch 11 and a curved surface curved in a substantially U shape, this shape cuts the cutting blade 12 as shown in FIG. 3 (b). Become a line CL.

When the punch 11 moves further downward from the state where the cutting blade 12 is pressed against the flat conductor 30, the cutting blade 12 cuts the flat conductor 30. As a result, as shown in FIG. 3C, the insulating coating 32 is peeled off, and a flat conductor 30 in which the conductor 31 is partially exposed can be obtained. As described above, even if the precut step is omitted, if the cutting blade 12 cuts the flat conductor 30 including the insulating coating 32 with the biting claws 17 and 18 biting into the insulating coating 32, the pair of clampers 15 and 16 Since the distance between each of the above and the cutting blade 12 is extremely small, dragging of the insulating coating 32 can be avoided, and turning of the insulating coating 32 can be suppressed.

Next, a comparative example will be described with reference to FIG. FIG. 4A is a flowchart showing the process of the cutting method according to the comparative example. FIG. 4B is an example of successful cutting according to a comparative example. FIG. 4C is an example of cutting failure according to a comparative example. In FIGS. 4 (b) and 4 (c), the right half of the cutting device 10 and the flat conductor 30 is omitted.

First, as shown in FIG. 4A, the precut blade 21 is pressed against the flat conductor 30 to perform precut (steps S11 and S12). As a result, as shown in FIG. 4B, a notch corresponding to the shape of the cutting edge of the precut blade 21 enters the flat conductor 30. When the precut is completed, the cutting blade 12 is pressed against the flat conductor 30 and the flat conductor 30 is cut (steps S13 and 14). In particular, when precutting is performed, it is required to improve the accuracy of the cutting position by the cutting blade 12 so that the cutting edge of the cutting blade 12 intersects the locus of cutting by the precut blade 21. The flat conductor 30 is successfully cut by crossing the cutting edge of the cutting blade 12 with the cutting locus of the precut blade 21.

For example, when the cutting edge of the cutting blade 12 does not intersect the cutting locus, as shown in FIG. 4C, a part of the insulating film 32 (hereinafter referred to as a residual film) is referred to as a part of the insulating film 32 between the cutting and the cutting edge of the cutting blade 12. ) 32A remains like a floating island. In this case, the cutting of the flat conductor 30 fails. The residual film 32A may lead to the occurrence of so-called thread burrs, and it is not desirable that the residual film 32A remains in order to avoid the occurrence of thread burrs. As described above, when the cutting method of the flat conductor 30 includes a pre-cutting step, it is required to pay attention to avoiding the occurrence of thread burrs, which may impose a burden on the cutting work. However, according to the present embodiment, since the precut step is omitted, it is possible to suppress the film turning without such a burden.

As described above, the method for cutting a flat conductor according to the present embodiment is a method for cutting a flat conductor 30 in which the surface of the conductor 31 is covered with an insulating coating 32, and includes two steps, a first step and a second step. There is. In the first step, a pair of clampers 15 and 16 having biting claws 17 and 18 extending toward the opposite first side surface of the flat conductor 30 are moved toward the first side surface in a direction approaching each other, and the clampers 15 and 16 are moved. This is a step of pressing each of the above against the flat conductor 30. In the first step, each of the clampers 15 and 16 is pressed against the flat conductor 30 with a constant load capable of suppressing the displacement of the flat conductor 30 due to the cutting of the flat conductor 30.

In the second step, the cutting blade 12 is pressed against the second side surface of the zenith of the flat conductor 30 intersecting the first side surface at a position separated from each of the clampers 15 and 16 by a certain distance or less, and the insulating coating 32 is included. This is a step of cutting the flat conductor 30. A certain distance is a distance capable of suppressing the turning of the insulating coating 32 in the longitudinal direction of the flat conductor 30. As described above, according to the method for cutting the flat conductor 30 according to the present embodiment, it is possible to suppress the film turning even if the precut step is omitted from the cutting method.

Although the preferred embodiments of the present invention have been described in detail above, the present invention is not limited to the specific embodiments, and various modifications and modifications are made within the scope of the gist of the present invention described in the claims. It can be changed.

10 Cutting device 12 Cutting blade 15, 16 Clamper 17, 18 Biting claw 30 Flat-angle conductor 31 Conductor 32 Insulation coating

Claims (1)

A method for cutting a flat conductor whose surface is covered with an insulating film.
A pair of clampers each having a claw extending toward a first side surface of the flat conductor are moved toward the first side surface in a direction approaching each other, and each of the clampers is moved toward the flat conductor. The process of pressing the conductor against the flat conductor with a constant load that can suppress the displacement of the conductor,
At a position separated from each of the clampers in the longitudinal direction of the flat conductor by a certain distance or less that can suppress the turning of the insulating coating, the cutting blade is placed on the second side surface of the zenith of the flat conductor that intersects the first side surface. Pressing The process of cutting the flat conductor including the insulating coating, and
A method for cutting a flat conductor, which comprises.

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