JPS59229249A - Cutting device for metallic wire rod - Google Patents

Abstract

PURPOSE:To eliminate the residual bending deformation of a cut metallic wire with a cutting device provided with a pair of front and rear clamps in a way as to place a cutting blade device between the same in order to fix the metallic wire rod by energizing elastically the front clamp toward the front during the actuation of the cutting blade. CONSTITUTION:A cutting device for a metallic wire has a pair of the 1st front clamp 12 and the 2nd rear clamp 13 in a way as to hold a cutting blade device 18 between the same in order to fix a metallic wire 11. The clamp 12 is energized forward toward the feed direction of a wire rod 12 by means of a spring 19. More specifically, the wire 11 is pulled forward by the clamp 12. Bending deformation is thus obviated when the incised part is forcibly opened by a moving blade 17.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a metal wire cutting device, and more specifically, the present invention relates to a metal wire cutting device, and more specifically, for example, a metal wire cutting device for cutting long metal wires to be used as lead wires for glass-sealed diodes, resistors, etc. The present invention relates to a cutting device that is used when manufacturing a metal wire by cutting it into a certain length, and is capable of extremely minimizing bending deformation of the cut metal wire during cutting.

In the manufacturing process of glass-sealed diodes, the process of welding a dumet wire and a lead wire, with their respective top surfaces facing each other and with a semiconductor element sandwiched between them, is sealed with a cylindrical glass. For example, the first
This is done as shown in the figure. That is, with a suitable jig a, hold the two Dumesoto wires d and c with their top surfaces facing each other and fit them into a cylindrical glass d with some allowance in the inner diameter, and then , by pressing the lead wire e welded to one of the two dumeter wires in the axial direction with a pressing tool g having a holding part f capable of holding the end of the lead wire, The contact pressure between the top surfaces of the wires and C and the semiconductor element is maintained at an appropriate level, and the glass d
is pressed and heated to bring it into close contact with the outer surface of the two Dumeso wires (c). The figure shows the glass sealing process for - glass-sealed diodes, but in reality there are many similar to the figure, lined up in an orderly manner, making it possible to glass-seal a large number of diodes at once. ing.

By the way, in the above-mentioned glass sealing process, if the lead wire e welded to the dumet wire was bent and deformed as shown by the imaginary line in FIG. The pressing tool g that should be moved will not be able to properly hold the lead wire e. In this case, since the contact pressure between the semiconductor element and the Dumesotho wire does not reach a predetermined value, the glass-sealed diode cannot achieve the predetermined characteristics and becomes a defective product.

The above lead wire e is manufactured by cutting a long metal wire into a predetermined length. FIG. 2 schematically shows a metal wire cutting device commonly used in such cases. The configuration and operation of this metal wire cutting device are as follows.

The metal wire 1 is pulled out for a predetermined length from the right side in FIG. 2, and is clamped and fixed by three clamps: a first clamp 2 at the front in the wire drawing direction and a second clamp 3 at the rear in the wire drawing direction. A cutting blade device 8 consisting of a fixed blade 5 having a wire holding surface 4 and a movable blade 7 having a wedge-shaped cutting edge 6 is arranged at an intermediate position between these two clamps. The movable blade 7 is held on the other side while being held on the wire holding surface 4.
By applying a shearing force to the metal wire 1 by applying the cutting edge 6, the wire on the left side of the cutting blade device 8 is separated from the wire on the right side. After cutting, the first clamp 2 and the second clamp 3 release their clamping forces to drop the cut metal wire 1a, and then pull out the metal wire 1 by a predetermined amount again to repeat the same operation as described above.

The conventional metal wire cutting device 8 as described above has the disadvantage that the metal wire 1 to be cut is bent and deformed during its cutting action. That is, as shown in FIG. 3, when the movable blade 7 cuts into the metal wire 1, the cutting edge 6
The slope 6a imparts a bending moment to the metal wire in the direction of arrow p in FIG. 3, and the deformation of the metal wire 1 as shown in FIG. 3 at this time remains as plastic deformation even after cutting. This is thought to be because the portion of the metal wire 1 that is pushed away by the slope 6a of the cutting edge 6 is instantaneously compressed and deformed. Such a phenomenon becomes particularly noticeable when the cutting edge 6 deteriorates as shown in FIG.

The above phenomenon can be prevented to some extent by reducing the inclination angle of the wedge of the movable blade 7, but this will cause another problem of extremely shortening the life of the blade edge, so this should not be adopted carelessly. I can't.

When the lead wires of the glass-sealed diodes mentioned above are manufactured using such conventional metal wire cutting equipment,
Among these, there are many bent and deformed items as described above,
Therefore, it is clear that the yield of the product after the glass sealing process is poor.

The present invention was devised in view of the circumstances described in 2.
The purpose is to provide a metal wire cutting device that can extremely reduce residual bending deformation of cut metal wires.

In order to achieve this objective, the present invention takes the following technical measures. That is, in a metal wire cutting device in which a pair of front and rear clamps for fixing a metal wire are arranged so as to sandwich a cutting blade device, the front clamp is elastically directed forward when the cutting blade device is operated. This is to make it more energized.

(Thus, when cutting, a tensile force is applied to the metal wire, so for example, when using a wedge-shaped cutting blade, the cutting blade can quickly cut through the metal wire, and It is very rare that bending deformation remains in the cut metal wire.This is because when the cutting blade advances, tensile stress is applied to the metal wire in front of the cutting blade device over its entire cross section. Therefore, stress concentrates on the part cut by the cutting blade, which helps the cutting action of the cutting blade, and even if a bending moment due to the cutting of the blade acts on the metal wire, the metal wire This is the result of a synergistic effect with the fact that tensile force is acting on the blade, so even if it is elastic, bending deformation is unlikely to occur.As mentioned above, the concentration of tensile stress during cutting causes the cutting blade to cut. In addition to the originally expected effect of being able to extremely reduce the residual bending deformation of the cut metal wire, the device of the present invention has the advantage of
It also has the additional effect of dramatically extending the life of the folding blade device.

Preferred embodiments of the present invention will be specifically described below with reference to the drawings.

FIG. 5 is a schematic diagram of a first embodiment of the device of the present invention. A metal wire feeding device (not shown) is provided on the right side of the figure for sequentially feeding metal wires in predetermined lengths in the direction of arrow F. The metal wire 11 fed out by a predetermined amount is fixed by two clamps, a first clamp 12 located at the front in the direction in which the wire is fed, and a second clamp 13 located at the rear. These first clamps 12
A fixed blade 15 having a wire holding portion 14 and a movable blade 1 having a wedge-shaped cutting edge 16 are located between the second clamp 13 and the second clamp 13 .
A cutting blade device 18 consisting of 7 is provided. Also,
Of the pair of front and rear clamps 12 and 13, the front clamp, that is, the first clamp 12, is biased forward in the wire feeding direction, that is, in the direction of arrow F, by a spring 19. The clamps 12, 1.3 are adapted to clamp and release the metal wire 11 by reciprocating as shown by the arrows in the figure. In the illustrated example, support means 20 for supporting the first clamp 12 in a reciprocating manner
By interposing a compression coil spring 19 between the first clamp 12 and a suitable fixing member 21, the first clamp 12 is biased in the direction of arrow F.

In the device of the present invention, as shown in FIG. 6, when the movable blade 17 cuts into the metal wire 11, the metal wire is pulled forward by the first clamp 12, so that the cut portion is cut by the movable blade. Even if a bending moment in the direction of the arrow m is applied to this portion when it is pushed open by the slope 17a of No. 17, it will not undergo bending deformation as shown in FIG. 3 even elastically. Therefore, even after cutting, there is no bending deformation remaining, and it is possible to make a straight metal wire (M).

FIG. 7 is a schematic diagram of another embodiment of the device of the present invention. This embodiment is configured such that after cutting the metal wire 11 to a predetermined length, a step of welding a dume/seat wire to the cut metal wire is performed at the same time.

The long metal wire 11 wound into a roll is straightened into a straight line by a feed roller 22 and sent to a predetermined length cutting position. In the direction in which the metal wire is fed, a second clamp 13, a cutting blade device 18, a first clamp 12, and a dumet wire welding device 23 are arranged in this order from the seventh right.

The second clamp 13 has two opposing members that sandwich the metal wire and move in the direction of the arrow to clamp or release the metal wire. The cutting blade device 18 holds the metal wire 11 in the central through hole 24 and includes a fixed blade 15 having a vertical flat surface 25 on the front surface, and a fixed blade 15 that cuts the metal wire 11 in the vertical direction so as to graze the vertical flat surface 25 of the fixed blade 15. The movable blade I7 reciprocates and has a wedge-shaped cutting edge 16. Said first clamp I2
A top surface 28 of an arm-shaped main body 27 whose one end is rotatably supported with respect to a fixed member 26, and a sliding member 29 supported so as to be slidable by a distance Mu relative to this main body 27. The metal wire 11 is appropriately sandwiched between the clamping surface 3° formed at 3°. The sliding member 29 is held in place by a spring 32 such that its clamping surface 3o is always aligned with the top surface 28 of the main body 27.
The clamp is released by forcibly moving the sliding member 29 by the cam 31 in the direction opposite to the direction in which the spring 32 biases the clamp. This first clamp 12 also has a spring 19 interposed between it and a fixed member 33, so that the first clamp 12 is always in the feeding direction (forward direction) of the metal wire, that is, the arrow f in FIG.
is biased to rotate in the direction. However, cam 34
This makes it possible to release this biasing force. In addition, in the figure, the reference numeral 35 indicates a stopper for defining the rotation end of the first clamp 12. In the dumet wire welding device 23, the dumet wires of the welding portion are sequentially fed to predetermined positions.

The operation of the metal wire cutting device of this embodiment is as follows.

Before the first clamp 12 clamps the metal wire 11, it is rotated in the direction of the arrow r by the cam 34, and the biasing force of the spring 19 is released. When the metal wire 11 is fed a predetermined length, the first and second clamps 1
2. '13 operates and fixes this. Then, the cam 34 rotates as shown by the phantom line, and the first clamp 12
An elastic rotational force in the direction of arrow f is applied to. Therefore, at this time, a tensile force acts on the metal wire between the first clamp 12 and the second clamp 13. In this state, the cutting blade device 18 operates to cut the metal wire 11 along the vertical -1 large flat surface 25 of the fixed blade 15. Needless to say, even in this case, as explained above, no bending deformation remains in the cut metal wire. When the metal wire is cut, the first clamp 12 is rotated by the tensile force of the spring 32 until it comes into contact with the stopper 35, that is, until it comes into contact with the imaginary line in the figure. At this time, the front end 11b of the metal wire 11, which is still held by the first clamp 12, is brought into contact with the center of the top surface of the dument wire that is supported coaxially with the metal wire tia in the dument wire welding device 23. At the same time, it is welded to this. That is, the dumet wire support part 36 of the welding device
, and the clamp portion 30 of the first clamp 12 also serve as an electrode for so-called projection welding.

When this welding is completed, the first clamp 12 and the second clamp 13 are released, and the same operation as described above is repeated thereafter.

It goes without saying that the scope of the present invention is not limited to the above embodiments. In this explanation, lead wires for electronic components such as glass-sealed diodes will be cited as examples of metal wires that require linearity in shape, and examples of manufacturing such lead wires as embodiments of the apparatus of the present invention will be described. Although a suitable device has been shown, the present invention is not limited thereto, and can be adapted as an apparatus for cutting all kinds of metal wires where straightness of shape is required.

As explained above, the present invention has an extremely simple configuration and has the excellent effect of being able to cut or shear a metal wire without bending or deforming it.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of the glass sealing process of a glass seal diode, Fig. 2 is a schematic configuration diagram of a conventional metal wire cutting device, and Figs. 3 and 4 are explanations of the operation of a conventional metal wire cutting device. FIG. 5 is a schematic structural explanatory diagram of the first embodiment of the present invention, FIG. 6 is an explanatory diagram of the operation of the present invention, and FIG. 7 is a schematic structural explanatory diagram of the second embodiment of the present invention. FIG. 8 is a diagram illustrating the ■-■ line in FIG. 7. 1]... Metal wire, 12... First clamp, 13... Second clamp, 18...
... Cutting blade device, 19 ... Spring applicant ROHM Co., Ltd.

Claims (1)

[Claims] (1) In a metal wire cutting device in which a pair of front and rear clamps for fixing a metal wire are arranged so as to sandwich a cutting blade device, the front clamp is elastically moved forward when the cutting blade device is operated. A metal wire cutting device characterized by being biased toward the direction of the metal wire.