JP2000232009A - Manufacture of resistor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a resistor for widening the variable range of a resistance value, without decreasing material strength at the time of reducing the shape of the resistor for realizing miniaturization. SOLUTION: This method for manufacturing a resistor comprises a process for punching a round hole 11a or a square hole 11b by press working with prescribed pitches on a band-shaped metallic plate 11, a cutting process for cutting the band-shaped metallic plate 11 at the part of the round hole 11a or the square hole 11b with the prescribed pitches, and for forming resistor bodies 26 and 26a, and a process for connecting metallic terminals 28 with the both edges of the resistor body 26. At changing the cutting width of the metallic plate 11 in the cutting process for the variation of a resistance value, the pressing position in the punching process is moved, while being linked with the change.

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 current detecting resistor for detecting a current value in a current-carrying circuit as a voltage value.

[0002]

2. Description of the Related Art As a conventional resistor of this type, there is known a resistor disclosed in a microfilm of Japanese Utility Model Application No. 60-41341 (Japanese Utility Model Application Laid-Open No. 61-157302).

[0003] A conventional resistor will be described below with reference to the drawings.

FIG. 7A is a perspective view of a conventional resistor, and FIG.
(B) is a figure which shows the state which attached the same resistor to the circuit board.

In FIG. 7A, reference numeral 1 denotes a metal plate formed by pressing a Cu--Ni alloy or the like. Terminal portions 2 and 3 are formed on both ends of the metal plate 1 at the same time as pressing.
Reference numerals 4 and 5 denote a plurality of large and small holes formed in the metal plate 1. These large and small holes 4 and 5 are provided to increase the surface area of the resistor and to suppress heat generation during energization. It is formed simultaneously with the pressing of the metal plate 1 or before and after the pressing. Reference numeral 6 denotes a notch as a variable resistance means.

In the above-mentioned conventional resistor, when the resistance is set to a desired value, as shown in FIG.
The terminals 2 and 3 of the metal plate 1 constituting the resistor are connected to the circuit board 7.
Then, one or several of the plurality of large and small holes 4 and 5 formed in the metal plate 1 are cut out with a tool such as a cutter to form a cutout portion 6. The side surfaces of the metal plate 1 and the large and small holes 4 and 5 are communicated to change the resistance value.

[0007]

However, in the conventional resistor described above, it is necessary to increase the number of large and small holes 4 and 5 formed in the metal plate 1 in order to widen the variable range of the resistance value. In addition, in order to increase the surface area of the resistor and to suppress heat generation during energization, it is essential to increase the number of large and small holes 4 and 5 formed in the metal plate 1. When the size of the resistor is reduced in order to reduce the size of the resistor, the number of large and small holes 4 and 5 cannot be increased from the viewpoint of material strength. I was

The present invention solves the above-mentioned conventional problems. Even when the shape is reduced in order to reduce the size, the material strength does not decrease and the variable range of the resistance value can be expanded. It is an object of the present invention to provide a method of manufacturing a resistor that can be used.

[0009]

In order to achieve the above object, a method of manufacturing a resistor according to the present invention comprises the steps of: forming a hole in a strip-shaped metal plate by pressing at a predetermined pitch; A cutting step of forming a resistor by cutting a strip-shaped metal plate at the hole, and a step of connecting metal terminals to both ends of the resistor, wherein a cutting width of the metal plate in the cutting step is variable in resistance value. Therefore, when changed for the purpose, the position of the press in the drilling step is moved in conjunction with this change, and according to this manufacturing method, even if the shape is reduced in order to reduce the size, In addition, the material strength is not reduced, and the variable range of the resistance value can be expanded.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is directed to a drilling step of punching holes in a strip-shaped metal plate at a predetermined pitch by pressing, and forming a strip-shaped metal plate at the holes of the predetermined pitch. A cutting step of cutting the plate to form a resistor;
Connecting metal terminals to both ends of the resistor,
When the cutting width of the metal plate in the cutting step is changed for changing the resistance value, the position of the press in the drilling step is moved in conjunction with this change,
According to this manufacturing method, the resistor is formed by cutting the band-shaped metal plate at a portion of the hole formed by pressing at a predetermined pitch in the band-shaped metal plate. In this case, a perfect hole is no longer formed, and as a result, even when the shape is reduced in order to reduce the size, the material strength does not decrease, and the metal value is changed in order to change the resistance value. Even if the cutting width of the plate is changed, the position of the press in the drilling process also moves in conjunction with the change of the cutting width of the metal plate so that the cutting can always be performed at the predetermined pitch of the hole. Since the shape of the notch formed in the case is always constant, and the resistance value can be changed by changing the shape of the hole and also by changing the cutting width of the band-shaped metal plate, Variable range of resistance value It is expected to have an effect that it is possible to widen.

(Embodiment 1) Hereinafter, a method of manufacturing a resistor according to Embodiment 1 of the present invention will be described with reference to the drawings.

FIG. 1 is a front view of a metal plate processing apparatus used in a method of manufacturing a resistor according to a first embodiment of the present invention, FIG. 2 is a plan view of a drilling unit in the metal plate processing apparatus, and FIG. FIG. 4A to FIG. 4D are front views showing a case where the cutting width of a strip-shaped metal plate is changed to allow a resistance value in the metal plate processing device. FIGS. FIG. 3 is a view showing a form of a resistor in the middle of processing and after completion of assembly.

The metal plate processing apparatus shown in FIG. 1 has a metal plate feed roller 12 for feeding a strip-shaped metal plate 11 and a work stopper 13 for stopping the feed. In between, a cutting die 14 and a punch 15 for punching a hole in the strip-shaped metal plate 11, and a cutting lower blade 16 and a cutting upper blade 16 for cutting the strip-shaped metal plate 11 with predetermined dimensions. 17 is provided.

Next, the specific operation will be described with reference to FIGS. 1, 2 and 3. FIG.

1 and 2, first, a strip-shaped metal plate 11 is sandwiched between a metal plate feed roller 12 and a holding roller 18, and the metal plate feed roller 12 is provided with a feed roller driving motor 19. It rotates by driving and feeds the band-shaped metal plate 11 until it hits the work stopper 13. When the band-shaped metal plate 11 hits the work stopper 13, the metal plate feed roller 12 stops,
The feeding of the band-shaped metal plate 11 is stopped.

When the strip-shaped metal plate 11 is stopped, the metal plate 11 is attached to the metal plate 11 by a punching die 14 and a punch 15 to which a driving force of a drilling cylinder 20 is transmitted, as shown in FIG. The punching die 14 and punching punch 15 are configured to ride on a punching die slide base 21, and the punching die slide base 21 is mounted on a punching unit slide base 23. The metal plate 11 has a round hole 11a,
The cutting is performed by the lower cutting blade 16 and the upper cutting blade 17. In this case, each time the band-shaped metal plate 11 is cut, a hole is formed at right angles to the feeding direction of the band-shaped metal plate 11 by driving the die slide cylinder 22. When the die slide base 21 is slid each time a hole is formed, the die-slide base 21 slides.
As shown in FIG. 4 (a), round holes 11a are formed in a staggered manner.

The drilling unit slide base 23 is provided for changing the press position in the drilling step in conjunction with the change in the cutting width of the metal plate 11 when the cutting width of the metal plate 11 is changed. It is clamped by a base clamp 24.

Next, the band-shaped metal plate 11 having the staggered round holes 11 a is subjected to the driving force of the cutting cylinder 25 by the cutting upper blade 17 at the cutting lower blade 16 toward the lower cutting blade 16. FIG. 4 (a) in which the band-shaped metal plate 11 is cut by the lower cutting blade 16 and the upper cutting blade 17 to form a resistor.
Is formed as shown in FIG. At this time, resistor 2
6, a staggered semicircular cutout portion 27 is formed.

A series of operations of feeding and stopping the metal plate 11, drilling the metal plate 11 by the punching die 14 and the punching punch 15, and cutting individual pieces of the metal plate 11 by the cutting lower blade 16 and the cutting upper blade 17, Form one cycle.
By repeating this cycle, a resistor 26 having a semicircular cutout 27 as shown in FIG. 4A or a square cutout 27a as shown in FIG.
Can be continuously produced.

The resistor 26 formed in the above process is
Next, as shown in FIG. 4 (c), both ends are attached to the concave portions 28a of the metal terminals 28 having a concave cross-sectional shape,
Then, the metal terminal 28 is plastically deformed by connecting the metal terminal 28 and the resistor 26 by applying pressure in a direction to reduce the width of the concave recessed portion 28a.
Metal terminals 2 are provided at both ends of the resistor 26 as shown in FIG.
A resistor having 8 is obtained.

FIG. 3 shows a state in which the position of the work stopper 13 is changed to change the cutting width of the strip-shaped metal plate 11 in order to change the resistance value in the metal plate processing apparatus shown in FIG. It is a front view of the metal plate processing apparatus which shows the state which changed the position where a hole was drilled in conjunction with (a).

Here, FIG. 3 shows a case where the cutting width is adjusted so as to obtain a low resistance value when the obtained resistor 26 is slightly higher than a desired resistance value.

The method for adjusting the cutting width will be described below.

First, the slide base clamp 24 is loosened from the state shown in FIG. 1, the micrometer head 29 is adjusted by a necessary amount, and the position of the work stopper 13 is adjusted via the connecting rod 30 between the work stopper 13 and the micrometer head 29. Move the required amount.

The above adjusting operation is inevitably performed by the end roller 13a attached to the work stopper 13 by the proportional lever 3
1 is moved about the fulcrum 32 of the proportional lever 31 as an axis, and the adjuster connecting rod 33 connected to the proportional lever 31 is slid.

When a predetermined moving amount is obtained, the drilling unit slide base 23 is clamped by the slide base clamp 24. The adjustment of the cutting width is completed by the above operation.

The drilling unit slide base 2 at this time
3 and the movement amount of the work stopper 13 are the distance between the fulcrum 32 of the proportional lever 31 and the center of the end roller 13a of the work stopper 13, and the distance between the fulcrum 32 and one end of the adjuster connecting rod 33. Move while maintaining the proportional relationship with. In the case of FIG. 1, since the proportional relationship indicates 1a: 3a, in FIG. 3, if the movement amount from the base of the work stopper 13 is D, the movement amount of the drilling unit slide base 23 is 3D.

As described above, since the movement amount of the drilling unit slide base 23 is interlocked in proportion to the adjustment amount of the work stopper 13 while maintaining the proportional relationship, the drilling unit can be adjusted only by adjusting the cutting width of the strip-shaped metal plate 11. The slide base 23 also moves in conjunction with it, so that in the case of FIG. 1, L: 3L correctly keeps 1: 3, and in the case of FIG. 3, L ': 3L' keeps 1: 3 correctly. Therefore, the band-shaped metal plate 11 is formed with a round hole 11a or a square hole 11b.
Will always be cut off.

FIG. 3 is a front view of the metal plate processing apparatus when the resistance value is adjusted to be low. When it is desired to increase the resistance value, the L dimension in FIG. 1 is adjusted by the adjustment procedure described above. , Can be obtained by narrowing.

In FIG. 1, if the distance between the lower cutting blade 16 and the center of the punching die 14 is to be correctly adjusted to be three times the distance L between the work stopper 13 and the lower cutting blade 16,
The adjuster connecting rod 33 is rotated in the axial direction, and can be adjusted by a left-handed screw end 33a and a right-handed screw end 33b attached to both end shafts.

(Embodiment 2) Hereinafter, a method of manufacturing a resistor according to Embodiment 2 of the present invention will be described with reference to the drawings.

FIG. 5 is a front view of a metal plate processing apparatus used in the method of manufacturing a resistor according to the second embodiment of the present invention, and FIGS. FIG. 4 is a view showing a form of a resistor in the middle of processing of the metal plate of FIG.

In FIG. 5, a metal plate feed roller 42 for feeding a band-shaped metal plate 41 feeds a band-shaped metal plate 41 together with a pressing roller 43.
Is a servo motor A44 that can control the feed amount
, The metal plate 41 is fed by a desired feed amount.

A drilling unit slide base 46 rides on the drilling unit base 45, and a drilling die slide base 47 rides on the drilling unit slide base 46. , Die slide cylinder 48
Thus, the belt-shaped metal plate 41 is configured to move at right angles to the feed direction.

The band-shaped metal plate 41 has a punching die 4
A round hole 41a shown in FIG. 6A is formed by the hole 9 and the punch 51 to which the driving force of the drilling cylinder 50 is transmitted. The round hole 41a of the metal plate 41 is
2 and the cutting blade 53, in this case,
Each time the band-shaped metal plate 41 is cut, the die slide cylinder 47 is configured to move in a direction perpendicular to the feeding direction of the metal plate 41 by driving the die slide cylinder 48. As shown in FIG. 6A, the round holes 41a are formed in a staggered manner.

Next, the metal plate 41 having the staggered round holes 41a is subjected to the driving force of the cutting cylinder 54 when the upper cutting blade 52 is moved toward the lower cutting blade 53 at the lower cutting blade 53. After descending, the metal plate 41 is cut by the lower cutting blade 53 and the upper cutting blade 52 to form a resistor 55 as shown in FIG. At this time, a staggered semicircular cutout 56 is formed in the resistor 55.

Feeding and stopping of the metal plate 41, drilling of the metal plate 41 by a punching die 49 and a punch 51, and cutting of the metal plate 41 by a lower cutting blade 53 and an upper cutting blade 52.
A single cycle is formed by a series of operations for cutting individual pieces. By repeating this cycle, FIG.
The resistor 55 having a semicircular cutout 56 as shown in FIG. 6 or the resistor 55a having a square cutout 56a as shown in FIG. 6B can be continuously produced.

In FIG. 5, the cutting lower blade 53 and the cutting upper blade 5
In the case where the resistance value of the resistor 55 formed by cutting the strip-shaped metal plate 41 with 2 is changed, the servo motor A44 is electrically controlled to change the feed amount of the strip-shaped metal plate 41 by a necessary amount. I do. The control of the servo motor A44 is interlocked with the control of the servomotor B58 for controlling the amount of movement of the drilling unit slide base 46, and the resistor 55
And the lower cutting blade 5 for cutting the band-shaped metal plate 41.
Since the ratio of the distance from the blade portion of No. 3 to the center of the hole of the punching die 49 is controlled to be constant, the relationship of L: 3L is always maintained. 41 is a drilled round hole 41a or a square hole 41b
6 is always cut at the center of FIG.
A resistor 55 as shown in FIG. 6 or a resistor 55a as shown in FIG. 6B can be obtained.

The resistor 55 constructed in the above-described steps is
Next, as shown in FIG. 6 (c), both ends are attached to the concave portion 57a of the metal terminal 57 having a concave cross section, and the width of the concave concave portion 57a is reduced. The metal terminal 57 is plastically deformed by pressing,
This connects the metal terminal 57 and the resistor 55, whereby a resistor having the metal terminals 57 at both ends of the resistor 55 as shown in FIG. 6D can be obtained.

[0040]

As described above, the method of manufacturing the resistor according to the present invention comprises the steps of: forming a hole in a band-shaped metal plate by pressing at a predetermined pitch; A cutting step of cutting the plate to form a resistor;
Connecting metal terminals to both ends of the resistor,
When the cutting width of the metal plate in the cutting step is changed for changing the resistance value, the position of the press in the drilling step is moved in conjunction with this change,
According to this manufacturing method, the resistor is formed by cutting the band-shaped metal plate at a portion of the hole formed by pressing at a predetermined pitch in the band-shaped metal plate. In this case, a perfect hole is no longer formed, and as a result, even when the shape is reduced in order to reduce the size, the material strength does not decrease, and the metal value is changed in order to change the resistance value. Even when the cutting width of the plate is changed, the position of the press in the drilling process also moves in conjunction with the change in the cutting width of the metal plate so that the hole can be cut at the specified pitch hole pitch. The shape of the notch formed in this case is always constant, and the resistance value can be changed by changing the shape of the hole or by changing the cutting width of the band-shaped metal plate. , Variable range of resistance value And has a superior effect can be increased.

[Brief description of the drawings]

FIG. 1 is a front view of a metal plate processing apparatus used in a method of manufacturing a resistor according to a first embodiment of the present invention.

FIG. 2 is a plan view of a drilling unit in the metal sheet processing apparatus.

FIG. 3 is a front view showing a case where a cutting width of a band-shaped metal plate is changed to change a resistance value in the metal plate processing apparatus.

4 (a) to 4 (d) are views showing the form of a resistor in the middle of the processing of a strip-shaped metal plate processed by the same metal plate processing apparatus and in a state of completion of assembly.

FIG. 5 is a front view of a metal plate processing apparatus used in a method of manufacturing a resistor according to a second embodiment of the present invention.

6 (a) to 6 (d) are views showing a form of a resistor in the middle of processing of a band-shaped metal plate processed by the same metal plate processing apparatus and in a state of completion of assembly.

FIG. 7A is a perspective view of a conventional resistor. FIG. 7B is a diagram showing a state where the resistor is mounted on a circuit board.

[Explanation of symbols]

 11, 41 strip-shaped metal plate 11a, 41a round hole 11b, 41b square hole 13 work stopper 14, 49 drilling die 15, 51 drilling punch 16, 53 cutting lower blade 17, 52 cutting upper blade 20, 50 drilling cylinder 21, 47 Drilling die slide base 22, 48 Die sliding cylinder 23, 46 Drilling unit slide base 25, 54 Cutting cylinder 26, 26a, 55, 55a Resistor 28, 57 Metal terminal 29 Micrometer head 30 Connecting rod 31 Proportional lever 33 Adjuster connecting rod 44 Servo motor A 58 Servo motor B

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yasuhiro Shindo 1006 Odakadoma, Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. 72) Inventor Masui ▲ Jo ▼ Sushi 1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric Industrial Co., Ltd.F-term (reference) 5E032 AB10 BB01 CA12 CC01 CC03 CC04 CC11 TA15 TB05

Claims (1)

[Claims] 1. A drilling step of punching holes in a band-shaped metal plate at a predetermined pitch by press working, and a cutting step of cutting a band-shaped metal plate at the holes of the predetermined pitch to form resistors. Connecting a metal terminal to both ends of the resistor, when the cutting width of the metal plate in the cutting step is changed for variable resistance, the position of the press in the drilling step in conjunction with this change. A method of manufacturing a resistor in which a resistor is moved.