JPS5850004B2 - Continuous alternating bending forming method and forming device for band-shaped flat plate - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a forming device for obtaining, for example, a band-shaped resistor by continuously and alternately bending a band-shaped flat plate, and in particular to continuous alternating bending forming of a band-shaped flat plate with an improved bending device for the band-shaped flat plate. It is related to the device.

Generally, a strip resistor formed from a strip-shaped flat plate is constructed as shown in FIGS. 1 to 4.

That is, the belt-like flat plate 1 is formed by continuously bending the flat plate 1 in opposite directions in its longitudinal direction.

1 and 2, boat bottom shaped protrusions 1a and 1b are formed which project in opposite directions at predetermined intervals in the longitudinal direction of the strip flat plate 1, and the boat bottom shaped protrusions 1a.

1b are alternately bent into a U-shape, and this U-shaped flat portion 1c
A pin hole 1d is provided in the pin hole 1d, into which a support pin 2 is inserted and fixed.

Furthermore, external connection terminals 3 are welded to both ends 1e of the strip-shaped flat plate 1.

The strip resistor constructed in this manner supports the support pin 2 by engaging with the insulating portion.

On the other hand, what is shown in Figures 3 and 4 is similar to Figures 1 and 2.
As shown in the figure, the parts are alternately and continuously bent, and the bent part is formed into a curved part 1f, which is held in a sandwiched state by two insulating supports.

Although the productivity of the band-shaped resistor was improved by forming the band-shaped flat plate 1 by alternately bending it in this manner, there was a problem in that the bent portions of the band-shaped flat plate 1 were insufficiently formed.

That is, a strip resistor that is bent into a U-shape is formed as shown in FIGS. 5 to 7.

The belt-like flat plate 1 wound into a coil on the support 4 is flattened by straightening curls by a leveler 5 comprising a plurality of roller groups.

Next, the band-shaped flat plate 1 is passed through the tension roller 6 to the boat bottom-shaped convex portion 1.
A drilling device 10A is sent between the molds 9A and 9B for forming a p 1 b, and makes a pin hole 1d which also serves as a reference for a bent portion.

10B, the punching devices 10A and 10B are released and the belt-shaped flat plate 1 is further fed in. With the pilot pin 12 inserted into the pin hole 1d, the molds 9A and 9B are operated, and the punching device 10A is opened.

Reactivate 10B.

The band-shaped flat plate 1 in which the boat-bottom convex portions 1a, 1b and the pin holes 1d have been formed in this way is sent onto the turntable 14 and held by the bending tool 15.

The bending tool 15 consists of a forming die 15A having a guide pin 15a that can be inserted into the pin hole 1d, and a forming roller 15B, and the bending is performed in the order shown in FIGS. 6A to 6E.

First, the pin 1d of the band-shaped flat plate 1 is moved to above the guide pin 15a of the mold 15A supported by the turntable 14, and the guide pin 15a is inserted.

Next, the forming roller 15B is applied and a bell) B or the like is wound between the forming roller 15B and the forming mold 15A to sandwich the band-shaped plate 1.

In this state (Fig. 6B), turn the full 14 in the direction of the arrow.
90 degrees, and after further rotation, forming roller 1
5B in the direction of the arrow in FIG. 6C, and then remove the band-like flat plate 1 from the bending tool 15 to form a U-shaped bent portion.

In addition, 13 is a cutting machine.

By the way, the forming roller 15B has a large diameter, and the forming roller 15B has a large diameter.
If the U-shaped bent portion can be strongly pressed against the mold 15A, the U-shaped bent portion will be formed with high precision according to the dimensions of the mold 15A, but as shown in FIG. If a large-diameter forming roller 15B is used because the formed bent portions are adjacent to each other, it becomes impossible to move the forming roller 15B between the adjacent bent portions, and the forming roller 15B is eventually moved to a small-diameter forming roller. I have no choice but to rely on it.

Therefore, due to insufficient forming force, the U-shaped flat portion 1c is curved as shown in FIG. 6E.

On the other hand, the strip resistor shown in FIGS. 3 and 4, in which the bent portion is a curved portion 1f, is formed as shown in FIG. 8.

Gripper 1 fixes the strip plate 1 sent out from the leveler 5
6 and length-measuring gripper 17, the sheet is fed by the bending distance of 1 minute, and then fed to the turntable 14 similar to that shown in FIG. 5, where the same bending operation is performed.

However, in this case, since the bent part is curved, the mold 18A
has a curved surface, and the forming roller 18B has a gap W shown in FIG.
Limited to smaller diameters.

For this reason, as described above, the bending force of the band-shaped flat plate 1 is weakened, and the dimensional accuracy of the bent portion is reduced.

In this way, when forming a conventional strip resistor, the dimensional accuracy of the bent portions is uneven, and in addition, the formed portion P swings when the turntable rotates and the forming roller moves, so the alignment of the adjacent bent portions becomes uneven. The angle, parallelism, and shape of the bent portion are distorted, resulting in the broken lines shown in FIGS. 3 and 4.

For this reason, it becomes impossible to support and attach the resistor without carrying out modification work after molding.

This phenomenon is a common problem in devices made by continuously and alternately bending long strip-like flat plates.

The present invention has been made in view of the above points, and an object of the present invention is to provide a continuous alternating bending device for flat strips that can continuously and alternately bend flat strips with high precision.

The present invention includes a conveyance device that feeds a belt-shaped flat plate in the longitudinal direction at a constant pitch, a positioning device that holds the transported belt-shaped flat plate in a fixed position, and a plurality of clamping molds for holding the belt-shaped flat plate held in a fixed position. a forming device that continuously bends and forms the waveform by holding it between two holding molds, and another device that narrows the interval between the waveforms by holding the bent portion of the band-like flat plate formed into the waveform between two holding molds as necessary. The molding is performed using a device equipped with a molding device.

An apparatus for forming a strip resistor according to an embodiment of the present invention will be described below with reference to FIGS. 9 to 12.

First, the configuration includes a support body 4 that winds the flat strip 1 into a coil and supports it rotatably, a leveler 5 that corrects the curl of the flat strip 10, and a flat plate 1 that cuts the flat strip 1 into a predetermined length. A cutting device 30 for forming the end portion 1e and a strip-shaped flat plate 1
Convex forming molds 9A and 9B that alternately form reverse boat bottom-shaped convex portions at predetermined intervals in the longitudinal direction; and a movable gripper that is located near the convex forming molds and grips the band-shaped flat plate 1. 17
, a fixed gripper 16 for positioning the belt-like flat plate 1 having a formed convex part, and a gripper 3 between the formed convex parts of the belt-like flat plate 1.
a first (preliminary) forming device 20 that clamps and bends the portion into an inverted V shape to form a continuous waveform; a drilling device 24 that makes a hole for a support pin in the bent portion; and a second molding device 27 that clamps the parts and molds them so that the legs of the inverted V shape are parallel.

The leveler 5 is made up of a plurality of rollers, some of which are drive rollers 5A with driving force, and the rest are driven rollers 5B.

Further, an air cylinder AC is connected to the leveler 5, and is held so as to be movable along the longitudinal direction of the strip plate by supplying and discharging air.

As shown in FIG. 11, the cutting device 30 first has a convex cutting die 31A and a concave die 31B for cutting the strip plate 1, and on both sides there are press dies 32A, 33A for bending the end and receiving dies 32B, 33.
There is B.

The cutting convex portion and the concave die are punching dies that are used not only to simply cut the strip plate 1, but also to form the end portion 1e into a tapered shape as shown in FIG. 12 so that the external terminal can be easily welded.

The receiving molds 32B and 33B are constantly pressed toward the pressing mold side by springs S.

The moving gripper 17 is attached to the two convex molds 9A and 9B.
A movable molding device 19 is located between the two.

The amount of movement l of this movable molding device 19 is the same amount as the distance between the boat-shaped convex portions.

The fixed gripper 16 holds the movable forming device 19 in its fixed position.
This is to fix and hold the strip plate 1 sent out from the machine in a fixed position.

The first molding device 20 includes three clamping molds 21 to 23, each of which is a clamping mold 21A and 21B.

22A, 22B, 23A, and 23B, and the clamping molds 21 and 22 have a bending mold 21C on both sides of the clamping molds 2iB and 22B, and the clamping mold 23 has a bending mold 21C on one side of the clamping mold 23B.
, 22C, and 23C.

In addition, the clamping mold 21 clamps and bends at a fixed position, and the clamping mold 22 clamps the horizontal strip-like flat plate 1 and rotates the clamping part in a direction diagonal to the plate surface in the conveying direction.
Move to the top of the glyph to perform the bending, and then use the clamping mold 2.
2, the clamping mold 23 is configured to clamp the band-shaped flat plate and move toward the clamping mold 21 by one dimension.

Next, the punching device 24 has two punching dies 25 and 26, with convex dies 25A, 26A and concave dies 25B, 26B facing each other.

The punching die 25 is located opposite the top of the inverted V-shape, and the punching die 26 is located facing the bottom of the V-shape.

Further, the second molding device 27 has two clamping molds 28 and 29.
Each is a clamping type 28A.

It has 28B, 29A, and 29B, and also a clamping type 2BB,
Bending molds 28C and 229C are provided on both sides of 29B.

Then, the clamping mold 28 moves as shown by the broken line arrow in FIG. 9, centering on the mold 29, and the direction of the mold 29 changes accordingly.

The devices described above are arranged along the traveling direction of the flat strip 1 and work together to constitute a strip resistor forming device.

Next, forming a resistor using the apparatus configured as above will be explained.

First, the strip-like flat plate 1 wound into a coil is sent to a leveler 5, where the curls are corrected and flattened.

The end portion 1e of the flattened strip-like plate 1 is processed by a cutting device 30 and shaped as shown in FIG. 12 to facilitate customer handling with an external terminal (reference numeral 3 in FIG. 1). I have to.

After the cutting device 30 performs the end portion processing, the cutting device 30 remains at rest until the end portion processing is performed.

The band-shaped flat plate 1 whose end has been processed is conveyed into the movable molding device 19 by being delivered by the leveler 8 .

The belt-like flat plate 1 carried in a predetermined amount is fixed by the moving gripper 17.

In this state, the convex molding dies 9A and 9B operate to form the belt-shaped flat plate 1.
Boat-shaped convex portions 1a facing oppositely to each other at a predetermined interval.
, 1 b.

The movable forming device 19 is moved by one dimension in the direction in which the strip plate advances, and the end portion 1 of the strip plate 1 is carried by this movement.
e is held by the fixed gripper 16.

Next, the movable gripper 17 and the convex molds 9A and 9B are released and returned to their original positions, and the movable gripper 17 again grips the band-like flat plate 1, while the fixed gripper 16 is released.

Then, the movable molding device 19 is moved again by one dimension and is gripped by the fixed gripper 16 and fixed at that position.

Thereafter, the movable molding device 19 is returned to its original position, and the movable gripper 17 performs clamping in the same manner as before.

In short, the movable molding device 19 is reciprocated twice by one dimension to move the band-shaped flat plate 1 by 21 steps, and the boat bottom-shaped convex portions la, 1b are formed once every 21 moves.

By repeating such operations, the boat bottom-shaped convex portions 1a, 1b facing in opposite directions are successively formed at predetermined intervals.

By intermittent movement of the upper eel by one dimension, the belt-shaped flat plate 1
When the end portion 1e reaches the clamping mold 21 of the first molding device 20, a molding operation as shown in FIG. 10 is performed.

That is, as shown in FIG. 10A, first, the clamping mold 22,
23 clamping types 22A, 22B and 23A.

23B to sandwich the bottom-shaped convex portions 1a and Ib of the flat strip 1, and then move the holding mold 22 to the upper right while moving the respective bending molds 22C and 23C toward the flat strip 1. Then, the clamping mold 23 is moved (one dimension) to the position of the clamping mold 22, and the band-shaped flat plate 1 is molded into an inverted square shape as shown in the opening of FIG.

At this time, a flat portion 1c for holding the holding molds 22A and 22B is formed at the top of the inverted V shape.

Next, the clamping molds 22 and 23 are released from the flat strip 1 and returned to their original positions.

In this state, the band-shaped flat plate 1 is moved by one dimension by the movable molding device 19, and in this state, it is clamped at three points by each clamping mold 2L22, 23.

At this time, the flat top portion 1c of the inverted square shape is located at the position of the punching die 25 of the punching device 24 (FIG. 10C).

In addition, the moving speed of this clamping mold 23 and the moving molding device 19
Since the moving speed is a simple stroke of the same one dimension, it can be easily synchronized, but it is extremely difficult to synchronize it with the delivery speed of the leveler 5.

For this reason, the feed speed of the leveler 5 is adjusted to the moving molding device 19.
The speed difference is absorbed by configuring the leveler 5 to be moved by being pulled by the belt-like flat plate 1, and when the movable molding device 19 returns to its original position, , the leveler 5 is also returned to its original position by the air cylinder AC while delivering the flat strip 1.

From the state shown in FIG. 10C, the first molding device 20 performs the two operations shown in FIG. 10A, and at the same time punches holes 1d for support pins.

At this time, the clamping mold 21 performs clamping and bending at a fixed position.

Next, each part of the first forming device 20 and the punching device 24 releases the flat strip 1 and moves the flat strip 1 by ■ dimensions, so that the V-shaped running part of the flat strip 1 is formed in the punching die 26. The punching die 25 has an inverted ■-shaped top portion located thereon.

Then, each clamping mold 21, 22, 23 is in the state shown in FIG. 10C.

In this state, two holes are punched and an inverted ■-shape is formed at the same time.

The band-like flat plate 1, which has been successively drilled and formed into an inverted ■ shape in this way, is formed into a continuous waveform, with its tip end positioned at the second forming device 27, as shown in FIG. 10-2. .

The second molding device 27 always has two clamping molds 28 and 29 that clamp both ends of the inverted V-shaped legs of the flat strip plate formed in the inverted V shape, that is, the top and the bottom of the inverted V shape. We are prepared.

A clamping die 28A of each of these clamping molds 28 and 29.

28B, 29A, and 29B sandwich the flat portion 1c with the raised pin hole 1d.

In this state, the bending molds 28C and 29C are respectively holding the clamping mold 28.
B.

Gradually come into close contact with 29B, and form the two legs parallel to each other, opening into an inverted V-shape and ■-shape.

Simultaneously with this molding, the clamping mold 28 moves counterclockwise around the clamping mold 29, and the clamping mold 29 also changes direction accordingly.

The other devices are inactive while the second molding device 27 is in operation, and merely move the band-shaped flat plate 1 by one dimension.

The second forming device bends the flat strip 1 in parallel, releases the flat strip 1, returns to its original position, and prepares to start the second forming operation.

Other devices 19, 20, 24 in between operate in conjunction with each other.

By repeating the above operations, the boat bottom shaped convex portions 1a, 1b
A series of operations can be performed including forming, forming an inverted V shape, drilling a pin hole 1d, and parallel forming.

Then, the cutting device 30 is operated again the required number of times to cut the flat strip 1 and form the end portion 1e.

As explained above, according to the present embodiment, the band-like flat plate 1 is preformed into a wave shape while being held, and the flat part 1c is held between the flat part 1c of the bent portion obtained by this forming. After drilling the hole, the remaining bending is done while holding the flat part 1c, so that the bent part is always held in place, and the forming device performs the forming operation based on this holding part. I do.

This eliminates misalignment of the bent portion, unstable support, and irregularities in dimensional accuracy of the bent portion due to insufficient bending force.

In the past, the pin hole was also deformed due to the uneven dimensional accuracy of the bent part, which caused problems such as difficulty in removing the guide pin 15, difficulty in inserting the support pin, and insufficient fixation of the support pin. In this example, holes were drilled with the belt-like flat plate bent more than half of the way, and after drilling, the remaining bending was performed by holding the plate so that no extra force was applied to the hole. Deformation is eliminated, and various problems caused by pin hole deformation are eliminated.

In the above embodiment, the band-shaped flat plate 1 has a boat bottom-shaped convex portion 1a.

1b, and the bent portion forms a U-shape. However, regarding the forming of a resistor having no boat bottom-shaped convex portion and the bent portion forms a curved portion, see Fig. 9. 11, the cutting device 30, movable molding device 19, and punching device 24 are omitted, and the clamping molds 21A, 21B, 22A, and 22B of the first molding device 20 and the second molding device 27 are omitted.
, 23A.

It is only necessary to make the opposing portions of 23B, 28A, 28B, 29A, and 29B curved surfaces, and further to provide a movable gripper 17 and a cutting machine between the first forming device 20 and the leveler 5, and the forming operation thereof is performed as described above. The operations are the same as those of the first molding device and the second molding device in the embodiment.

Since the bending is performed while holding the portion to be bent without using a small-diameter forming roller, irregularities in dimensional accuracy caused by insufficient support or rocking of the bending portion are eliminated.

In addition, the embodiment of the present invention is an example in which the bending is performed in an inverted ■ shape, and then the process is performed in a parallel manner.
There is no problem in making them parallel after bending them into a letter shape.

By the way, each of the above embodiments is a forming device for a band-shaped resistor, but it is not limited to resistors, but can be used for forming a band-shaped flat plate into a continuous wave shape, or for forming the intervals between the waveforms even narrower. Applicable to all cases.

As explained above, the present invention includes a conveyance device that feeds a belt-shaped flat plate in the longitudinal direction by a fixed pitch, a positioning device that holds the transported belt-shaped flat plate in a fixed position, and a plurality of belt-shaped flat plates held in a fixed position. A forming device that forms a continuous waveform by holding it with a holding mold, and, if necessary, holding bent portions that will become peaks and valleys of the band-like flat plate formed in the waveform with a holding mold, respectively, and forming the waveform. The belt-shaped flat plate is continuously bent using a separate forming device that narrows the interval between the two, and since this bending is performed using the clamping portion as a reference, the bending can be performed with sufficient support from the reference portion. In addition, the lack of forming force caused by the small diameter forming roller as in the conventional case is eliminated, and therefore, irregularities in the dimensional accuracy of the bent portions of the resistor can be eliminated.

Further, the above series of operations can be performed continuously by simply supplying the strip plate, so the molding operation becomes extremely simple.

[Brief explanation of the drawing]

Figure 1 is a side view showing a strip resistor, Figure 2 is a front view of the same,
FIG. 3 is a side view showing another strip resistor, FIG. 4 is a front view of the same, FIG. 5 is a schematic side view showing a conventional forming device, and FIGS. Fig. 7 is an enlarged view showing the main parts of the belt-like flat plate bent by the device shown in Fig. 5, and Fig. 8 is a schematic side view showing another conventional forming device. , FIG. 9 is a schematic side view showing a molding device according to the present invention, FIGS.
FIG. 12 is a longitudinal sectional side view showing the cutting device used in the figure, and FIG. 12 is a perspective view showing the cutting portion of the band-shaped flat plate. 1... Band-shaped flat plate, 16... Fixed gripper-117... Moving gripper-120...
...First molding device, 27...Second molding device.

Claims (1)

[Scope of Claims] 1. When the belt-shaped flat plate is clamped and alternately bent from the first to third clamping devices positioned at equal intervals from the rear side in order from the rear side along the conveyance direction of the belt-shaped flat plate, at least the first to third clamping devices are used. The flat strip is clamped at two points, the first and second clamping devices, and then the clamping portion clamped by the second clamping device is moved a predetermined distance in a direction diagonal to the plate surface in the conveyance direction of the flat strip. a first step of forming a bent portion by moving the holding portion held at the first holding position in the conveying direction in synchronization with the diagonal movement; After releasing the clamping of the belt-shaped flat plate, a second step of transporting the belt-shaped flat plate so that the rearmost bent portion formed in the first step is at the third clamping position; The conveyed belt-shaped flat plate is clamped at the first to third clamping positions, and then the clamping parts clamped at the first and second clamping positions are moved in the same manner as in the first step to fold it. A third step of forming a curved portion; and after releasing the clamping of the flat strip in this third step, the bending portion at the rearmost portion formed in the third step is brought to the third clamping position. and a fourth step of conveying the flat plate in the form of a continuous alternating bending method. When the flat strip is clamped and bent alternately, the flat strip is clamped at least at two points, the first and second clamping positions, and then the clamping portions clamped at the second clamping position are folded into the flat plate. is moved a predetermined distance in a direction diagonal to the board surface in the conveyance direction, and the clamping part held at the first clamping position is moved in the conveyance direction in synchronization with the diagonal movement to form a bending part. After releasing the clamping of the belt-like flat plate by this first step, the first step is performed such that the rearmost bent portion formed in the first step is at the third clamping position. A second step of conveying the flat strip, and pinching the flat plate conveyed in this second step at three points, the first to third clamping positions, and then at two points, the first and second clamping positions. A third step in which the clamped clamping portion is moved in the same manner as in the first step to form a bent portion, and after the belt-like flat plate is released from the clamping in the third step, the third step is performed in the third step. a preforming step of forming the strip-like flat plate into a continuous wave shape by a fourth step of transporting the strip-like flat plate so that the formed rearmost bent portion comes to the third clamping position; The adjacent bent portions of the peaks and valleys of the formed waveform are pinched from the fourth and fifth pinching positions, and then the pinching portions pinched at the fourth pinching position are moved to the fifth pinching position. The center is moved by a certain angle in the circumferential direction, and the holding portion held at the fifth holding position is rotated in the same direction at the same position in synchronization with the movement in the circumferential direction to narrow the interval between the waveforms. A continuous alternating bending forming method for a band-shaped flat plate, comprising a forming step of forming a flat plate. 3. A conveyance device that conveys a strip-shaped flat plate in its longitudinal direction, a positioning device that holds the transported strip-shaped flat plate in a fixed position, and a forming device that clamps the strip-shaped flat plate held in a fixed position and forms it into a wave shape. The corrugating device has first to third clamping molds arranged at equal intervals from the rear along the conveying direction of the flat strip, and the second clamping mold clamps and conveys the flat strip. The first clamping mold is configured to move a predetermined distance in a direction oblique to the plate surface, and the first clamping mold moves in the conveying direction in synchronization with the second clamping mold. Continuous alternating bending forming device for flat strips. 4. A conveyance device that conveys a strip-shaped flat plate in its longitudinal direction, a positioning device that holds the transported strip-shaped flat plate in a fixed position, and a preforming device that pinches the strip-shaped flat plate held in a fixed position and forms it into a wave shape. and a forming device that pinches adjacent bent portions of peaks and troughs of preformed corrugations so as to sandwich the waveform intervals, and the preforming device is configured to convey the belt-like flat plate. It has first to third clamping molds arranged at equal intervals from the rear along the direction, and the second clamping mold clamps the strip-like flat plate and performs titration in a direction oblique to the plate surface in the transport direction. The first clamping mold is configured to move in the conveyance direction in synchronization with the second clamping mold, and the molding device is configured to move a first clamping mold by a distance, and the first clamping mold is configured to move in the transport direction in synchronization with the second clamping mold, and the molding device has a first clamping mold that clamps adjacent clamping portions of the strip-like flat plate, respectively. 4. A fifth clamping mold is provided, the fifth clamping mold moves at a certain angle in the circumferential direction centering on the fourth clamping mold while clamping the clamping part, and the fourth clamping mold 2. A continuous alternating bending forming device for a strip-like flat plate, characterized in that the device is configured to rotate in the same direction at the same position while holding the bent portion in synchronization with the third holding mold.