JP2004022333A - Wire drawing machine and cable manufacturing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress the stretched amount of an inner linear conductor from the end of an insulating coating portion in cutting the end of a cable by applying a tensional force to the cable. <P>SOLUTION: The insulating coating portion 2 is formed on the circumference of the linear conductor 1b after the softened linear conductor 1a is fully extended by a control device 38 between wire drawing rollers 31 and 32 which can adjust the number of revolution. Afterwards, the end of the cable is cut by applying the tensional force to the cable with a cutting and crimping machine. For a certain period of time of operation start-up and shutdown and when the linear conductor 1a has a joint portion and the joint portion passes between both the wire drawing rollers 31 and 32, the peripheral velocity of the wire drawing rollers 31 and 32 is equalized, and in other cases, ratio of the peripheral velocity is varied, so that the linear conductor 1a is extended. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention provides a method for cutting a wire by applying tension to an electric wire having an outer periphery covered with an insulating covering portion and cutting the end portion before coating the insulating covering portion. The present invention also relates to a wire drawing machine for suppressing the amount of protrusion of the linear conductor from the end of the insulating covering portion and a technique related thereto.
[0002]
[Prior art]
In general, by intermittently sending out an electric wire (wire harness) to cut an end portion, and sequentially performing terminal processing such as peeling and crimp connection of a terminal fitting on the terminal portion separated by the cutting, 2. Description of the Related Art There is known a cutting and crimping machine which is adapted to sequentially manufacture products subjected to a desired processing.
[0003]
In this cutting and crimping machine, when sending out an electric wire, the sending length is measured, the feeding operation is stopped when an appropriate electric wire length is sent out, the end is cut, and then the end is peeled. And crimp the terminals.
[0004]
[Problems to be solved by the invention]
By the way, in the conventional cutting and crimping machine, when sending out the wire and cutting the end and crimping the terminal, in order to improve the measurement accuracy of the wire length, the end of the wire is held and tension is applied to the wire and the roller. I try to minimize the slip with.
[0005]
However, when tension is applied to the electric wire in this way, the electric wire is elongated by several percent. Then, the elongation amount may be different between the inner linear conductor and the outer insulating coating. For example, if a wire that is relatively difficult to stretch is used as the insulating coating of the wire and a material that is easily stretched, such as copper, is used as the wire conductor, the cut surface is more insulated than the wire conductor. The coating is less likely to stretch. Therefore, as shown in FIG. 6, the end of the linear conductor 1 may protrude from the insulating coating 2 by about 1 mm after the electric wire is cut. Then, there is a problem in that the protrusion size of the linear conductor 1 from the insulating coating portion 2 varies, and it is difficult to make the product quality uniform. Further, when crimping the terminal to the end of the wire, the crimp of the terminal may be difficult because the end of the wire has an unpredictable shape.
[0006]
Considering this, it is conceivable to change the material of the insulating coating portion 2. However, it is often difficult to change the material of the insulating coating portion 2 in consideration of the specification of the electric wire required by the supplier.
[0007]
Accordingly, an object of the present invention is to provide a wire drawing machine and a wire drawing machine capable of easily suppressing the amount of elongation from the end of an insulating coating portion of an internal linear conductor when applying tension to an electric wire and cutting the end. To provide technology.
[0008]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the invention according to claim 1 is to apply tension to an electric wire in which an outer periphery of a linear conductor is covered with an insulating covering portion and cut the end portion before applying the insulating covering portion. A wire drawing machine for suppressing the amount of protrusion of the linear conductor from the end of the insulating coating after cutting by stretching the wire conductor in advance, wherein the wire softened by a predetermined softening machine. A first drawing roller for receiving the linear conductor, first driving means for rotating and driving the first drawing roller, and a line for receiving the linear conductor sent from the first drawing roller A second wire drawing roller for stretching the conductor, second driving means for rotating and driving the second wire drawing roller, and the second wire drawing roller with respect to the peripheral speed of the first wire drawing roller Drive of both drive means so as to arbitrarily change the ratio of the peripheral speeds of In which and a peripheral speed ratio adjusting means for controlling.
[0009]
The invention according to claim 2 is the wire drawing machine according to claim 1, wherein the peripheral speed ratio adjusting means is configured to control a peripheral speed of the first wire drawing roller and a peripheral speed of the second wire drawing roller. And a ratio operation mode in which the peripheral speed of the second wire drawing roller is increased at an arbitrary ratio with respect to the peripheral speed of the first wire drawing roller. is there.
[0010]
According to a third aspect of the present invention, in the wire drawing machine according to the second aspect, the peripheral speed ratio adjusting unit controls the driving of the two driving units in the same speed operation mode for a fixed time from the start of operation. Then, after the elapse of the certain time, the mode is switched to the ratio operation mode.
[0011]
According to a fourth aspect of the present invention, in the wire drawing machine according to the second or third aspect, the peripheral speed ratio adjusting unit operates in the ratio operation mode until a certain time before the end of operation is reached. The driving of both driving means is controlled, and the operation mode is switched to the same speed operation mode at the predetermined time before the end of the operation.
[0012]
The invention according to claim 5 is the wire drawing machine according to any one of claims 2 to 4, wherein the linear conductor is formed by joining a plurality of metal wires together at a joint. The peripheral speed ratio adjusting means controls the driving of the two driving means in the same speed operation mode while the joint portion passes between the two drawing rollers.
[0013]
The invention according to claim 6 is an electric wire manufacturing apparatus in which the wire drawing machine according to any one of claims 1 to 5 is incorporated, wherein the wire drawing machine and the linear conductor are softened. A softening machine to be supplied to the wire drawing machine, a covering means for covering an outer periphery of the linear conductor stretched by the wire drawing machine with an insulating covering portion, and the insulating covering on the outer periphery of the linear conductor by the covering means. And a cutting and crimping machine for cutting the end while applying tension to the wire covered with the part and crimping the terminal to the end.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 is a block diagram showing an electric wire manufacturing apparatus to which a wire drawing machine according to one embodiment of the present invention is applied.
[0015]
As shown in FIG. 1, this electric wire manufacturing apparatus coats an outer periphery of a linear conductor 1 formed by twisting linear copper or a copper alloy or the like with an insulating coating 2 made of resin (see FIG. 6). Then, after forming one continuous electric wire 3, the end is cut to a predetermined size, the end is peeled, the terminal is crimped, and finally a finished product 3a as a product is manufactured. A softening machine 11 for softening the linear conductor 1, a wire drawing machine 12 for stretching the linear conductor 1a softened by the softening machine 11, and a linear conductor 1b stretched by the wire drawing machine 12. An extruder (coating means) 13 for forming one electric wire 3 by coating the outer periphery with the insulating coating portion 2, and an end of the electric wire 3 sent from the extruder 13 is cut into a predetermined size and peeled. And a cutting crimping machine 14 for crimping the terminal to the end.
[0016]
In order to prevent the linear conductor 1 from hardening and being easily torn during the wire drawing by the wire drawing machine 12 or the coating of the insulating coating portion 2 by the extruder 13, the softening machine 11 It is for softening. Specifically, as shown in FIG. 2, the softening machine 11 bridges the bare linear conductor 1 between a pair of upper and lower rollers 21 and 22 and moves the linear conductor 1 between the pair of rollers 21 and 22. By applying a current to 1 and heating it, the linear conductor 1 is softened. The softening of the linear conductor 1 by the softening machine 11, compared with the stretching amount of the linear conductor 1 of 25 to 30% when the tension is applied by the cutting and crimping machine 14 in the related art, enables the cutting and crimping. When tension is applied by the machine 14, the elongation of the linear conductor 1 is suppressed to about 20%.
[0017]
At this time, the degree of softening of the linear conductor 1 can be controlled to some extent by the mode of the current flowing through the linear conductor 1 (current magnitude, time, etc.). What kind of softening treatment should be performed in order to obtain the desired elongation, and in this case, what kind of current should be applied, are experimentally and empirically determined according to the conductor diameter and the conductor material. Obtainable.
[0018]
Reference numerals 23 and 24 in FIG. 2 indicate guide rollers for guiding the linear conductors 1 and 1a.
[0019]
The wire drawing machine 12 includes a pair of wire drawing rollers 31 and 32 each having a circumferential speed (a moving speed of the outer circumference by rotation) that can be individually adjusted so as to bridge and extend the linear conductor 1a softened by the softening machine 11. A line tuning dancer roller device 33 for tuning the linear conductor 1b stretched by the wire drawing rollers 31 and 32 to a line speed for supplying the extruder 13 in a subsequent process.
[0020]
In each of the drawing rollers 31 and 32, the wire conductors 1a are wound around the outer periphery a plurality of times to prevent slipping on the outer periphery, and the respective drawing rollers 31 and 32 are driven by independent motors (driving means). ) The rotary conductors 35 and 36 are rotated to stretch the linear conductor 1 a given from the softening machine 11 and send it to the dancer roller device 33.
[0021]
The rotation speed of the first motor 35 for driving each of the first wire drawing rollers 31 and the rotation speed of the second motor 36 for driving the second wire drawing roller 32 are determined by CPU, ROM, RAM, and the like. It can be arbitrarily adjusted by operation control of a control device (peripheral speed ratio adjusting means) 38 which is a computer device provided with the same speed operation in which the peripheral speeds of both drawing rollers 31 and 32 are the same. It is possible to switch between a mode and a ratio operation mode in which the peripheral speeds of the both drawing rollers 31 and 32 are differently rotated at an arbitrary ratio. When the ratio operation mode is set, the ratio of the peripheral speeds of the drawing rollers 31 and 32 is adjusted (see FIG. 4: described later), so that the linear drawing is performed at an arbitrary drawing ratio of about 1% to 5%. The conductor 1a can be stretched.
[0022]
The dancer roller device 33 is configured such that the rotation shaft 39a of the upper dancer roller 33a is pivotally supported at a fixed point of the main body case of the wire drawing machine 12, while the rotation shaft 39b of the lower dancer roller 33b can move up and down. When the rotating shaft 39b of the lower dancer roller 33b is urged downward by an urging means 33c such as a spring, the linear conductor 1b bridged between the dancer rollers 33a and 33b is formed. The linear conductor 1b is sent out to the extruder 13 in a later step while keeping the tension of the wire constant.
[0023]
The extruder 13 includes, for example, a screw, a cylinder, a gear box, and the like, and extrudes the resin by rotating the screw while dispersing and kneading the resin stored in the cylinder to form the insulating coating portion 2 on the outer periphery of the linear conductor 1b. The general thing which manufactures the electric wire 3 is used.
[0024]
For example, as shown in FIG. 5, the cutting and pressing machine 14 conveys the electric wire 3 supplied from the extruder 13 while applying tension to the electric wire 3 with guide rollers 41a, 41b, 42a, and 42b. The rear end is cut with a pair of upper and lower cutters 43a and 43b, and the head is cut and peeled with a pair of upper and lower cutters 44a and 44b. This is a general method of crimping. In FIG. 5, the cutters 43a, 43b, 44a, and 44b are respectively installed at positions corresponding to both ends of the electric wire 3, but the cutters may be installed on only one of them.
[0025]
The operation of the electric wire manufacturing apparatus having the above configuration will be described.
[0026]
First, the linear conductor 1 is supplied to the softening device 11, and the linear conductor 1 is softened by applying a current to the linear conductor 1 and overheating. The linear conductor 1a softened by the softening machine 11 is supplied to a wire drawing machine 12.
[0027]
The linear conductor 1a supplied to the wire drawing machine 12 is first wound around the upper wire drawing roller 31 a plurality of times, and then sent to the lower wire drawing roller 32 so as to be bridged. Is wound around the wire drawing roller 32 a plurality of times, and then sent to the dancer roller device 33.
[0028]
Here, the wire drawing rollers 31 and 32 are driven to rotate by independent motors 35 and 36, respectively. The peripheral speeds of the wire drawing rollers 31 and 32 are as shown in FIG.
[0029]
In FIG. 4, reference numeral Cv1 indicates the peripheral speed of the upper drawing roller 31, and reference numeral Cv2 indicates the peripheral speed of the lower drawing roller 32. Until a certain period of time has elapsed since the start of the operation of the electric wire manufacturing apparatus, the softening treatment in the softening machine 11, which is the previous step, is insufficient, and if a strong tension is applied, the linear conductor 1a may be disconnected. is there. For this reason, in FIG. 4, the control device 38 maintains the same speed operation mode in which the peripheral speeds of both the drawing rollers 31 and 32 are the same until a certain time T1 elapses after the operation of the wire manufacturing device is started. Meanwhile, the peripheral speeds of the drawing rollers 31 and 32 are gradually increased.
[0030]
Then, at a point in time when a certain time T1 has elapsed since the operation of the electric wire manufacturing apparatus has started, the control device 38 switches to the ratio operation mode, and at times T2 and T4, the peripheral speed of the upper wire drawing roller 31 is reduced to the lower speed. The two drawing rollers 31 and 32 are rotationally driven while being kept small at a constant ratio with respect to the peripheral speed of the drawing roller 32. As a result, the linear conductor 1a softened by the softening device 11 is supplied to the dancer roller device 33 as a linear conductor 1b elongated by about 1% to 5%.
[0031]
Since one long linear conductor 1 or 1a may be formed by joining the ends of a plurality of metal wires, a joint portion where the metal wires are joined to each other is connected to both drawing rollers 31 and 1a. When passing through the space between the joints 32, if a tension is applied to this joint, the joint of the joint may be cut. In consideration of this, while the joint portion is bridged between the two drawing rollers 31 and 32 and passes, during the time T3, the control device 38 is switched to the same speed operation mode, and the peripheral speed of the both drawing rollers 31 and 32 is reduced. The two drawing rollers 31, 32 are driven to rotate while maintaining the same.
[0032]
Further, when the operation of the wire manufacturing apparatus is terminated, in order to prevent the wire drawing machine 12 from stopping while tension is applied to the linear conductor 1a, at a certain time T5 before the wire drawing machine 12 is stopped, The controller 38 switches to the same speed operation mode, and gradually reduces the peripheral speeds of the both drawing rollers 31 and 32 while maintaining the same peripheral speeds of the both drawing rollers 31 and 32.
[0033]
As described above, the tension is applied as needed while appropriately switching between the ratio operation mode and the same speed operation mode of the two drawing rollers 31 and 32 in which the linear conductor 1a is bridged by the control device 38, so that the drawing is performed. The linear conductor 1b is supplied to the dancer roller device 33.
[0034]
In the dancer roller device 33, the rotation shaft 39a of the upper dancer roller 33a is supported by a fixed point of the main body case of the wire drawing machine 12, while the rotation shaft 39b of the lower dancer roller 33b can move up and down. In addition, when the rotating shaft 39b of the lower dancer roller 33b is urged downward by an urging means 33c such as a spring, the tension of the linear conductor 1b bridged between the dancer rollers 33a and 33b is increased. Is kept constant by the urging means 33c, and the linear conductor 1b is sent out to the extruder 13 in a later step.
[0035]
In the extruder 13, the outer periphery of the linear conductor 1b stretched by the wire drawing machine 12 is coated with the insulating coating portion 2.
[0036]
Then, in the cutting and pressing machine 14, the electric wire 3 supplied from the extruder 13 is conveyed while applying tension to the electric wire 3 by the guide rollers 41a, 41b, 42a, and 42b. The ends are cut by a pair of upper and lower cutters 43a and 43b, and the top is cut by a pair of upper and lower cutters 44a and 44b. Then, a terminal (not shown) is crimped to complete the electric wire 3a as a product.
[0037]
After the linear conductor 1 is softened by the softening machine 11 as described above, the linear conductor 1a is stretched in advance by about 1% to 5% by the wire drawing machine 12, and the outer periphery of the linear conductor 1b is coated with an insulating material. Since the end is cut while the tension is applied to the electric wire 3 by the cutting and crimping machine 14 after covering the portion 2, the end from the insulating coating portion 2 at the end when the tension is applied by the cutting and crimping machine 14. The protrusion size of the linear conductor 1b can be suppressed.
[0038]
In addition, before performing the cutting and press-bonding after forming the insulating coating portion 2, even if only the softening process is performed by the softening machine 11 without installing the wire drawing machine 12, the linear conductor 1 a can be removed from the insulating coating portion 2 to some extent. Can also be suppressed. Specifically, if the amount of current flowing through the linear conductor 1a during the softening treatment is adjusted as compared with about 25% to 30% when the softening treatment is not performed, the tensile elongation of the linear conductor 1a can be reduced. It can be suppressed to about 20%. However, it is difficult to suppress the elongation of the linear conductor 1a to less than about 20% even by adjusting the amount of current in the softening process.
[0039]
On the other hand, as in this embodiment, after the softening process is performed by the softening machine 11, the linear conductor 1a is further stretched by the wire drawing machine 12 and then subjected to the cutting and press-bonding by applying tension, whereby the cutting is performed. The amount of elongation of the linear conductor 1b during crimping can be suppressed to about 15% to 19%. Therefore, there is an advantage that crimping of the terminal by the cutting and crimping machine 14 in a later step can be easily performed.
[0040]
Here, in this embodiment, the wire drawing machine 12 is installed between the softening machine 11 and the extruder 13, and the wire conductor 1a is stretched by the wire drawing machine 12 in advance. Between the extruder 13 and the extruder 13, the linear conductor 1a is passed through a predetermined die (die: not shown), lightly compressed, and the linear conductor 1a is hardened, whereby the tension in the cutting and pressing machine 14 is obtained. A method of suppressing the amount of elongation of the linear conductor 1a during application is also conceivable.
[0041]
However, in the method of curing the linear conductor 1a using a die, the die is a consumable and needs to be replaced according to the degree of wear. Therefore, regular management of the die itself is necessary. It takes. In the case of hardening with a die, it is difficult to adjust the amount of elongation of the linear conductor 1a during operation. Further, there is a disadvantage that the joint portion is easily cut when the joint portion passes through the die.
[0042]
On the other hand, this embodiment is advantageous in that the amount of elongation of the linear conductor 1a can be adjusted, the trouble of exchanging the dies is eliminated, and the joint can be prevented from being cut. is there.
[0043]
As described above, in the present embodiment, the peripheral speeds of the drawing rollers 31 and 32 of the drawing machine 12 are arbitrarily adjusted based on the control of the control device 38, so that the operation at the start and end of the operation is performed. The protrusion of the linear conductor 1b at the end of the insulating coating portion 2 can be efficiently suppressed while limiting the tension of the linear conductor 1b and preventing the joint portion from being cut.
[0044]
【The invention's effect】
According to the first and sixth aspects of the invention, the linear conductor softened by the softening machine is received by the first drawing roller of the wire drawing machine, and the wire sent out from the first drawing roller. The conductor is received by a second drawing roller and stretched. At this time, the peripheral speed ratio adjusting means controls the driving of both driving means so as to arbitrarily change the ratio of the peripheral speed of the second drawing roller to the peripheral speed of the first drawing roller. The extension amount of the linear conductor in the machine can be adjusted arbitrarily. Therefore, when the wire is cut by applying tension to the wire in the cutting and crimping machine in the subsequent process, the wire conductor has already been cut in a stretched state by the wire drawing machine. The amount of protrusion of the linear conductor can be sufficiently suppressed. In particular, it is possible to significantly reduce the amount of linear conductors protruding from the end of the insulating coating as compared to the case where the insulating coating is formed immediately after softening with a softener and tension is applied to cut. Become. Further, compared with a case where the softened linear conductor is lightly compressed through a die and hardened, there is no need to replace the die, and the amount of elongation of the linear conductor can be easily adjusted.
[0045]
According to the invention described in claim 2, the peripheral speed ratio adjusting means sets the peripheral speed of the first drawing roller and the peripheral speed of the second drawing roller to the same speed operation mode; Since it is possible to switch between the peripheral speed of the first wire drawing roller and the ratio operation mode in which the peripheral speed of the second wire drawing roller is increased at an arbitrary ratio, for example, from the start of operation as in claim 3 For a certain period of time, or for a certain period of time before the end of operation as in claim 4, it is possible to prevent the linear conductor that has not been sufficiently softened from being broken by applying excessive tension, and further, for example, as in claim 5, When a linear conductor is formed by joining a plurality of metal wires together at a joint, while the joint passes between the two drawing rollers, the drive of both driving means is controlled in the same speed operation mode. To prevent the joint from breaking. Kill.
[Brief description of the drawings]
FIG. 1 is a block diagram showing an electric wire manufacturing apparatus according to one embodiment of the present invention.
FIG. 2 is a view schematically showing a general softener.
FIG. 3 is a view schematically showing a wire drawing machine according to one embodiment of the present invention.
FIG. 4 is a diagram showing a change in the peripheral speed of both drawing rollers controlled by a control device.
FIG. 5 is a view schematically showing a general cutting and pressing machine.
FIG. 6 is a diagram showing a state in which when an end is cut by applying tension to an electric wire, an internal linear conductor protrudes from an end of an insulating coating portion.
[Explanation of symbols]
1, 1a, 1b Linear conductor 2 Insulating coating 3, 3a Electric wire 11 Softening machine 12 Wire drawing machine 13 Extruder 14 Cutting crimping machine 21 Roller 31, 32 Wire drawing roller 33 Dancer roller device 35, 36 Motor 38 Control device

Claims (6)

In applying tension to the electric wire covered with the insulating coating on the outer periphery of the linear conductor and cutting the end, the wire is stretched in advance before coating the insulating coating. A wire drawing machine for suppressing the amount of protrusion of the linear conductor from the end of the part,
A first drawing roller for receiving a linear conductor softened by a predetermined softening machine;
First driving means for rotating and driving the first wire drawing roller;
A second drawing roller for receiving the linear conductor sent from the first drawing roller and stretching the linear conductor;
A second driving unit that rotationally drives the second wire drawing roller;
A wire drawing machine comprising: a peripheral speed ratio adjusting means for controlling the driving of both driving means so as to arbitrarily change a ratio of a peripheral speed of the second wire drawing roller to a peripheral speed of the first wire drawing roller. The wire drawing machine according to claim 1,
A peripheral speed ratio adjusting means for setting a peripheral speed of the first wire drawing roller and a peripheral speed of the second wire drawing roller at the same speed; a peripheral speed of the first wire drawing roller; A drawing machine characterized by switching between a ratio operation mode in which a peripheral speed of the second drawing roller is increased at an arbitrary ratio with respect to a speed. The wire drawing machine according to claim 2,
Wherein the peripheral speed ratio adjusting means controls the driving of the two driving means in the same speed operation mode for a fixed time from the start of operation, and switches to the ratio operation mode after the lapse of the fixed time. . The wire drawing machine according to claim 2 or claim 3,
The peripheral speed ratio adjusting means controls the driving of the two driving means in the ratio operation mode until a certain time before the end of operation comes, and switches to the same speed operation mode for the certain time before the end of operation. Characteristic wire drawing machine. The wire drawing machine according to any one of claims 2 to 4, wherein
When the linear conductor is formed by joining a plurality of metal wires to each other at a joint, the peripheral speed ratio adjusting unit may be configured such that, while the joint passes between the two drawing rollers, A wire drawing machine characterized by controlling the driving of both driving means in the same speed operation mode. An electric wire manufacturing apparatus incorporating the wire drawing machine according to any one of claims 1 to 5,
The wire drawing machine;
A softening machine that softens the linear conductor and supplies the wire to the wire drawing machine;
Coating means for coating the outer periphery of the linear conductor stretched by the wire drawing machine with an insulating coating portion,
An electric wire manufacturing apparatus comprising: a cutting crimping machine that cuts an end while applying tension to the electric wire in which the insulating covering portion is coated on the outer periphery of the linear conductor by the coating means, and crimps a terminal to the end.

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