JP2016150378A - Thermocompression bonding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thermocompression bonding device capable of easily determining abnormality of an electric wire.SOLUTION: A thermocompression bonding device comprises: a pair of electrodes 20 for welding mutual core wires 61 by electrically conducting a welding current to the core wires 61, by pressurizing the mutual core wires 61 respectively possessed by an electric wire 60 for constituting a combination electric wire 64 of combining a plurality of electric wires 60, in the vertical direction; a height displacement sensor 45 for detecting a height of the mutual core wires 61 superposed in the vertical direction; and an abnormality detection part 55 for detecting abnormality of the combination electric wire 64 on the basis of a detection result in the height displacement sensor 45. The height displacement sensor 45 detects the height of the mutual core wires 61 in a pressurized state in the vertical direction by the pair of electrodes 20, and the abnormality detection part 55 detects the abnormality of the combination electric wire 64 by comparing the height of the mutual core wires 61 of the pressurized state in the vertical direction with a preset threshold value.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a thermocompression bonding apparatus.

  The thermocompression bonding apparatus exposes the core wires of the electric wires each having a plurality of core wires made of a plurality of twisted wires, and uses the resistance heat generated by energizing a large current while pressing the core wires together to press the core wires together. Melt and perform resistance welding between core wires. For example, in the resistance welding apparatus described in Patent Document 1, the welding quality is stabilized by energizing the welding current until the height of the welded portion reaches the reference welding height.

Japanese Patent Laid-Open No. 11-5175

  Here, when connecting a plurality of electric wires by thermocompression bonding of the core wire, the number of wires to be connected is less than the target number, or an attempt is made to thermocompress the number of wires more than the target number. There is a fear. Moreover, when connecting a some electric wire, connecting a different kind of electric wire is also considered. However, in the process of thermocompression bonding of wires, many wires are thermocompression-bonded in sequence, so the number of wires in each bundle of wires is counted and the determination of whether the wires to be connected are appropriate. It is difficult to go and it is very difficult to judge the abnormality of the electric wire.

  This invention is made | formed in view of the above, Comprising: It aims at providing the thermocompression bonding apparatus which can judge abnormality of an electric wire easily.

  In order to solve the above-described problems and achieve the object, the thermocompression bonding apparatus according to the present invention pressurizes the conductor portions of the electric wires constituting the combination electric wire combining a plurality of electric wires in the vertical direction, A pair of electrodes for welding the conductor parts by passing a welding current to the conductor parts, a height detection part for detecting the height of the conductor parts stacked in the vertical direction, and the height detection An abnormality detection unit that detects an abnormality of the combination electric wire based on a detection result in the unit, and the height detection unit is configured to detect the height of the conductor portions in a state of being pressed up and down by a pair of the electrodes. The height is detected, and the abnormality detection unit detects the abnormality of the combination electric wire by comparing the height of the conductors in a state of being pressurized in the vertical direction with a preset threshold value. Features.

  Moreover, in the thermocompression bonding apparatus, the upper limit value and the lower limit value of the height of the conductor portions in a state of being pressed in the vertical direction are set as the threshold value for each set number of the electric wires in the combination electric wire, The abnormality detection unit determines that the number of the electric wires is excessive when the height of the conductor portions detected by the height detection unit is equal to or more than the upper limit value, and the height detection unit When the detected height of the conductor portion is equal to or lower than the lower limit value, it is preferable to determine that the number of the electric wires is insufficient.

  Moreover, the said thermocompression bonding apparatus WHEREIN: It is preferable that the said abnormality detection part detects the abnormality of the thickness of the said conductor part which the said electric wire which comprises the said combined electric wire has as an abnormality of the said combined electric wire.

  Further, in the thermocompression bonding apparatus, the abnormality detection unit pressurizes the conductors in a vertical direction with a pair of the electrodes, and heights of the conductors before the welding current is supplied to the conductors. It is preferable to detect abnormality of the combination electric wire based on the above.

  In the thermocompression bonding apparatus, the abnormality detection unit pressurizes the conductors in a vertical direction with a pair of the electrodes, and applies a welding current to the conductors to weld the conductors to each other. It is preferable to detect an abnormality in the combination wire based on the height of the conductor portions.

  Moreover, the said thermocompression bonding apparatus WHEREIN: It is preferable that the said threshold value is set on the basis of the said thinest conductor part among the several said electric wires which comprise the said combination electric wire.

  The thermocompression bonding apparatus according to the present invention has an effect that an abnormality of an electric wire can be easily determined.

FIG. 1 is a schematic view of a thermocompression bonding apparatus according to the embodiment. FIG. 2 is a perspective view of an electrode included in the thermocompression bonding apparatus shown in FIG. FIG. 3 is a block diagram showing a main configuration of the thermocompression bonding apparatus shown in FIG. FIG. 4 is a flowchart showing a processing procedure when the thermocompression bonding of the electric wire is performed by the thermocompression bonding apparatus. FIG. 5 is an explanatory diagram in the case where the electric wires are set at the time of thermocompression bonding of the electric wires constituting the combination electric wires. 6 is a cross-sectional view taken along the line AA in FIG. FIG. 7 is a cross-sectional view of the core wire showing a state before the thermocompression bonding of the core wire. FIG. 8 is a cross-sectional view of the core wire showing a state after the thermocompression bonding of the core wire. FIG. 9 is an explanatory diagram in the case where the number of core wires included in the electric wire is the number set in the combination electric wire. FIG. 10 is an explanatory diagram showing a state in which the number of wires is smaller than the set number due to the occurrence of wire disconnection in the combination wires. FIG. 11 is an explanatory diagram showing a state where the number of core wires is larger than the set number of electric wires. FIG. 12 is an explanatory diagram of threshold values used for determining whether the number of wires is excessive or insufficient. FIG. 13 is an explanatory diagram of a combination electric wire having a core wire whose thickness is different from the setting.

  Embodiments of a thermocompression bonding apparatus according to the present invention will be described below in detail with reference to the drawings. In addition, this invention is not limited by this embodiment. In addition, constituent elements in the following embodiments include those that can be easily replaced by those skilled in the art or those that are substantially the same.

Embodiment
FIG. 1 is a schematic view of a thermocompression bonding apparatus according to the embodiment. FIG. 2 is a perspective view of an electrode included in the thermocompression bonding apparatus shown in FIG. The thermocompression bonding apparatus 1 according to the embodiment employs an AC thyristor system (a system in which a thyristor is used as a power switch, and a welding current is continuously adjusted by changing a starting phase of the thyristor or the like). This is a device for welding and thermocompression bonding a combination wire 64 in which a plurality of wires 60 are combined. This thermocompression bonding apparatus 1 has a box-shaped apparatus main body 5 with a substantially U-shaped side surface, and a plurality of electric wires for thermocompression bonding are provided at the center of the apparatus main body 5, that is, in a recessed portion in the U-shape. An electric wire setting jig 10 which is a jig for holding 60 in a desired state is arranged. In the apparatus main body 5, an air cylinder 15 is disposed above the electric wire setting jig 10.

  Below the electric wire setting jig 10 and the air cylinder 15, the welded portion of the core wire 61 is vertically moved in a state where the core wires 61 that are conductor portions of the plurality of electric wires 60 constituting the combination electric wire 64 are vertically stacked. A pair of upper and lower electrodes 20 are provided for welding the core wires 61 by applying a welding current to the welded portion of the core wire 61 while applying pressure in the direction. Each of the pair of electrodes 20 includes a cylindrical chromium copper body 23 and a rectangular parallelepiped tungsten chip 24. Here, the core wire 61 is formed by twisting a plurality of conductive strands, for example.

  Specifically, of the pair of electrodes 20, the first electrode 21 that is the electrode 20 located on the upper side and the second electrode 22 that is the electrode 20 located on the lower side are both composed of the tungsten chip 24 and the other electrode 20. It is comprised so that it may oppose. That is, the first electrode 21 is provided with the tungsten tip 24 on the lower end side of the chromium copper body 23, and the second electrode 22 is provided with the tungsten tip 24 on the upper end side of the chromium copper body 23. In both the first electrode 21 and the second electrode 22, the tungsten chip 24 faces the other electrode 20. At that time, the tungsten tip 24 of the first electrode 21 and the tungsten tip 24 of the second electrode 22 are arranged so that the longitudinal directions of the rectangular parallelepiped shapes that are the respective shapes are oriented in the same direction. . That is, the tungsten tip 24 of the first electrode 21 and the tungsten tip 24 of the second electrode 22 are arranged in a substantially parallel orientation.

  The first electrode 21 of the pair of electrodes 20 is connected to the piston rod 16 of the air cylinder 15 via the electrode holder 25, and the first rod 21 is expanded and contracted as the air cylinder 15 is actuated. The electrode 21 moves in the vertical direction. A welding transformer 30 that supplies a welding current to the electrode 20 is disposed below the electrode 20, and the first electrode 21 is connected to the welding transformer 30 via an ounce copper plate 31. On the other hand, the second electrode 22 is fixed to the central portion of the apparatus main body 5 and connected to the welding transformer 30. The welding transformer 30 includes primary and secondary windings in order to obtain a low voltage (for example, about 2 V) and a large current (for example, 4000 to 6000 A).

  FIG. 3 is a block diagram showing a main configuration of the thermocompression bonding apparatus shown in FIG. The welding transformer 30 is connected with a welding timer 35 for controlling the energization time of the welding current, and the welding timer 35 is connected with a sequencer 36 having a sequence control circuit and the like. The welding timer 35 is controlled by the energization start and energization end signals from the sequencer 36, and can cause the welding transformer 30 to perform energization start and energization stop operations.

  Further, the air cylinder 15 is operated by controlling the air flowing into and out of the air cylinder 15 by the electromagnetic valve 17 and can move the piston rod 16 up and down. The electromagnetic valve 17 is also controlled by energization start and energization end signals from the sequencer 36, and the electromagnetic valve 17 can operate the air cylinder 15 by opening and closing by these signals. The air cylinder 15 is actuated, and the applied pressure generated between the pair of electrodes 20 by the piston rod 16 is set to about 100 to 200 kgf, for example.

  In addition, the wire setting jig 10 is a width that is a width measuring unit that measures the welding width W of the welded portion of the assembly 65 of the core wires 61 including the core wires 61 included in each of the plurality of wires 60 constituting the combination wire 64. A displacement sensor 40 is provided. The width displacement sensor 40 includes a contact measuring element 41 that moves in the horizontal direction, that is, the width direction of the assembly 65 of the core wire 61 to be welded, and the assembly 65 of the core wire 61 depends on the movement distance of the contact measuring element 41. It is possible to measure the welding width W of the welded portion.

  The width displacement sensor 40 is connected to a sequencer 36, and the sequencer 36 is connected to a calculation unit 50 that performs various calculation processes. The hardware configuration of the arithmetic unit 50 mainly includes a CPU (Central Processing Unit) that performs arithmetic processing, a program for operating the thermocompression bonding apparatus 1, a RAM (Random Access Memory) that stores various types of information, and a ROM (Read Only Memory). ) And the like, and is the same as a known arithmetic device, and detailed description thereof is omitted.

  In addition, the calculation unit 50 is provided with a display 51 that is a display unit that displays an energization time from the start of energization of the welding current to the stop of energization. The display 51 is arranged at a position where an operator who performs work using the thermocompression bonding apparatus 1 can visually recognize, and includes a display member such as a liquid crystal panel. It is possible to display information such as the energization time until.

  Further, the electrode holder 25 has a height for measuring the height H ′ (see FIG. 6) of the welded portion of the assembly 65 of the core wires 61 composed of the core wires 61 included in each of the plurality of wires 60 constituting the combination wire 64. A displacement sensor 45 is provided. The height displacement sensor 45 is provided as a height detection unit that detects the height of the core wires 61 stacked in the vertical direction. The height displacement sensor 45 includes a contact measuring element 46 that moves in the vertical direction and abuts against the reference plate portion 11 provided in the electric wire setting jig 10 for detecting the height by the height displacement sensor 45. . The height displacement sensor 45 detects the relative movement distance between the height displacement sensor 45 provided on the first electrode 21 side and the reference plate portion 11 provided in the wire setting jig 10 by the contact measuring element 46. Thus, it is possible to detect the height H ′ of the welded portion in the assembly 65 of the core wires 61. The height displacement sensor 45 provided in this way is also connected to the sequencer 36 in the same manner as the width displacement sensor 40.

  In addition, the calculation unit 50 is provided with an abnormality detection unit 55 that detects an abnormality of the combination electric wire 64 based on the detection result of the height displacement sensor 45. The abnormality detection unit 55 includes a program and a database stored in the storage unit of the calculation unit 50. The abnormality detection unit 55 executes the program, and detects the detection result of the height displacement sensor 45 and the data in the database. By comparing, it is possible to detect an abnormality in the combination wire 64. As an abnormality of the combination electric wire 64, for example, it is possible to detect an excess or deficiency of the electric wires 60 constituting the combination electric wire 64.

  The thermocompression bonding apparatus 1 according to the present embodiment is configured as described above, and the operation thereof will be described below. FIG. 4 is a flowchart showing a processing procedure when the thermocompression bonding of the electric wire is performed by the thermocompression bonding apparatus. FIG. 5 is an explanatory diagram for setting the electric wires constituting the combination electric wires. 6 is a cross-sectional view taken along the line AA in FIG. When the electric wire 60 constituting the combination electric wire 64 is thermocompression bonded by the thermocompression bonding apparatus 1, the covering 62 of the welded portion of each electric wire 60 constituting the combination electric wire 64 is removed, and the core wire 61 is exposed by each electric wire 60. Then, the core wires 61 of the respective electric wires 60 are collectively set as the aggregate 65 in the electric wire setting jig 10. That is, in the electric wire 60 constituting the combination electric wire 64, the aggregate 65 of the exposed core wires 61 is disposed between the first electrode 21 and the second electrode 22. In this state, the welding width W of the welded portion of the core wire 61 is detected by measuring with the width displacement sensor 40 (step ST11).

  Specifically, when the core wire 61 is set on the electric wire setting jig 10, the core wire 61 is held by the pair of holding members 12 included in the electric wire setting jig 10 from both sides in the width direction of the core wire 61. That is, the core wire 61 is held by the holding member 12 by being inserted between the holding members 12. At that time, the holding member 12 moves the holding member 12 relative to the width of the core wire 61 by moving one or both of the holding members 12 in a direction in which the interval changes in accordance with the width of the core wire 61. To match. When the holding member 12 is moved, the contact measuring element 41 of the width displacement sensor 40 is also moved along with the holding member 12, so that the width displacement sensor 40 detects the moving distance of the contact measuring element 41. The welding width W of the welded portion of the core wire 61 is detected.

  Next, based on the reference welding cross-sectional area S of the welding part of the core wire 61 which the electric wire 60 which comprises the combination electric wire 64 previously determined from the welding width W detected by the width displacement sensor 40, the reference welding of the said welding part is carried out. The height H is calculated by the calculation unit 50 (step ST12). Here, the reference welding height H of the welded portion will be described. FIG. 7 is a cross-sectional view of the core wire showing a state before the thermocompression bonding of the core wire. FIG. 8 is a cross-sectional view of the core wire showing a state after the thermocompression bonding of the core wire. When the core wires 61 included in each of the electric wires 60 constituting the combination electric wire 64 are thermocompression bonded, a welding current is applied to the core wires 61 in a state where the core wires 61 are in the aggregate 65, and the core wires 61 are heated by resistance heating. While increasing the temperature, the core wires 61 are thermocompression bonded together by applying a load in a direction to compress in the vertical direction. For this reason, the height H of the core wires 61 joined together by thermocompression is lower than the height H ′ before thermocompression.

  On the other hand, since the core wire 61 is held by the electric wire setting jig 10 in the width direction, the welding width W between the core wires 61 hardly changes before and after thermocompression bonding. Moreover, the height between the core wires 61 is approximately the same as the welding width W, and the cross-sectional area obtained by summing the cross-sectional areas of the plurality of core wires 61 hardly changes before and after the thermocompression bonding. Further, in the storage unit of the calculation unit 50, the cross-sectional area of the core wires 61 joined together after thermocompression bonding with respect to the welding width W of the core wires 61 is a database as the reference welding cross-sectional area S of the welded portion of the core wires 61. Is stored in memory. For this reason, the calculation unit 50 calculates the reference welding height H of the welded part based on the welding width W detected by the width displacement sensor 40 and the reference welding cross-sectional area S corresponding to the welding width W (S ÷ W = H).

  After calculating the reference welding height H, the calculated reference welding height H is displayed on the display 51 (step ST13), and a welding start instruction is given (step ST14). That is, the sequencer 36 issues a welding start input instruction. Thereby, the welding timer 35 is started (step ST15), and the air cylinder 15 is operated (step ST16). The operation of the air cylinder 15 is such that compressed air is supplied to the air cylinder 15 by opening a solenoid valve 17 connected to a compressed air source such as a compressor (not shown), and the pressure of the compressed air causes the air cylinder 15 to be operated. Operates.

  When the air cylinder 15 is activated, the piston rod 16 extends downward, and the first electrode 21 is lowered accordingly. Since the welding part in the core wire 61 of the electric wire 60 is arrange | positioned between the 1st electrode 21 and the 2nd electrode 22, when the 1st electrode 21 descend | falls, the 1st electrode 21 is this core wire 61. To touch. In this state, when the first electrode 21 is further lowered, the first electrode 21 and the second electrode 22 pressurize the welded portion of the core wire 61 in a direction in which the core wires 61 are compressed from the vertical direction. become. The computing unit 50 determines whether or not the initial pressurization to the core wire 61 has been completed based on the time after the operation of the air cylinder 15 or the pressure of the air supplied to the air cylinder 15 (step ST17). If it is determined by this determination that the initial pressurization is not completed (step ST17, No determination), the pressurization to the core wire 61 is continued.

  On the other hand, if it is determined by this determination that the initial pressurization has been completed (step ST17, Yes determination), the height H ′ of the welded portion between the core wires 61 in the state where the pressurization is performed in the vertical direction. Is detected by measuring with the height displacement sensor 45 (step ST18). Specifically, the height displacement sensor 45 is attached to the first electrode 21 side, and the contact measuring element 46 comes into contact with the reference plate portion 11 of the electric wire setting jig 10 provided on the second electrode 22 side. It is possible to measure the relative moving distance between the first electrode 21 side and the second electrode 22 side moving in the vertical direction. The height displacement sensor 45 detects the height H ′ of the welded portion between the core wires 61 by measuring the relative movement distance between the first electrode 21 side and the second electrode 22 side in this way. . Thereby, the height displacement sensor 45 detects the height H ′ between the core wires 61 in a state where the initial pressurization is completed and the pair of electrodes 20 pressurize in the vertical direction.

  If the height H ′ of the welded portion between the core wires 61 is detected, it is next determined whether or not the core wire 61 is excessive or insufficient (step ST19). This determination is performed by the abnormality detection unit 55 included in the calculation unit 50, and the abnormality detection unit 55 compares the height H ′ of the cores 61 in a state where the pressure is applied in the vertical direction with a preset threshold value. Thus, as an example of the abnormality determination of the combined electric wire 64, the excess or deficiency of the core wire 61 of the electric wire 60 is determined, and the excess or deficiency of the core wire 61 is detected.

  FIG. 9 is an explanatory diagram in the case where the number of core wires included in the electric wire is the number set in the combination electric wire. FIG. 10 is an explanatory diagram showing a state in which the number of wires is smaller than the set number due to the occurrence of wire disconnection in the combination wires. FIG. 11 is an explanatory diagram showing a state where the number of core wires is larger than the set number of electric wires. The number of wires 60 is set for each combination wire 64 in the wire 60 included in the combination wire 64. Normally, the combination wire 64 has the set number of wires 60. For example, when the set number of electric wires 60 included in one set of combination electric wires 64 is eight, the combination electric wires 64 usually have eight electric wires 60, that is, eight core wires 61 are provided. (FIG. 9). On the other hand, if the combination wire 64 is disconnected and the number of the wires 60 is less than the set number, the number of the wires 60 included in the combination wire 64, that is, the number of the core wires 61 The number is 7 (FIG. 10). In addition, the number of wires 60 that are more than necessary may be collected in the combination wire 64, and when the number of wires 60 is one more than the set number, the number of wires 60 that the combination wire 64 has, that is, The number of core wires 61 is nine (FIG. 11).

The abnormality detection unit 55 determines whether the actual number of the electric wires 60 is as small as or larger than the number of the electric wires 60 set for each combination electric wire 64, or whether the set number is high. The height H ′ between the core wires 61 detected by the height displacement sensor 45 is compared with a preset threshold value. FIG. 12 is an explanatory diagram of threshold values used for determining whether the number of wires is excessive or insufficient. The threshold value used for determining whether or not the number of the electric wires 60 actually included in the combination electric wire 64 is excessive or insufficient is between the core wires 61 in the state where the wires 61 are pressed in the vertical direction for each set number of the electric wires 60 in the combination electric wire 64. An upper limit value 71 and a lower limit value 72 of the height H ′ are set as threshold values. These upper limit value 71 and lower limit value 72 are set based on the average value of the height in the vertical direction when the number of wires 60 included in the combination wire 64 is one more or less than the set number. At that time, in order to obtain the height when the number of the electric wires 60 is one more or less than the set number with higher accuracy and set these as threshold values, the upper limit value 71 and the lower limit are set using the standard deviation σ. The value 72 is preferably calculated and set. As an example of calculating the upper limit value 71 and the lower limit value 72 using the standard deviation σ, the following formulas (1) and (2) are used. In addition, as for the average of the height of the welding part of the core wire 61 in Formula (1), (2), it is preferable to obtain | require the average of about ten electric wires 60 (N = 10).
Upper limit value 71 = (average of the height of the welded portion when the number of set pieces + 1) −3σ (1)
Lower limit value 72 = (average of the height of the welded portion when the number of set pieces −1) + 3σ (2)

  That is, the upper limit value 71 is 3σ which is three times the standard deviation σ from the average of the heights of the welded portions of the core wires 61 in the state of being pressed in the vertical direction when the number of the wires 60 is the set number + 1. Is subtracted to obtain the lower limit of the height of the welded portion between the core wires 61 when the number of the electric wires 60 is one more than the set number, and this is set as the upper limit value 71. That is, the height of the welded portion between the core wires 61 is slightly different for each combination electric wire 64 even between the combination electric wires 64 having the same number of the electric wires 60. Therefore, a plurality of combinations in which the number of the electric wires 60 is one more than the set number. When the height of the welded portion between the respective core wires 61 in the electric wire 64 is expressed by a numerical value, a single additional range 77 in which the numerical values are dispersed is formed.

  For this reason, when setting the upper limit value 71, all the values of the heights of the core wires 61 in the case where the numerical value is dispersed in this way and the number of wires 60 is one more than the set number are excluded as much as possible. In order to exclude all the heights included in the increase range 77, a value obtained by subtracting three times the standard deviation σ from the average value of the heights is set as the upper limit value 71. That is, when the lower limit of the one-increase range 77 is set as the upper limit value 71 and the height H ′ between the core wires 61 detected by the height displacement sensor 45 is greater than or equal to the upper limit value 71, the detected height H ′ Is included in the additional range 77 or more, so that the number of wires 60 can be determined to be greater than the set number.

  Similarly, the lower limit value 72 is three times the standard deviation σ from the average of the heights of the welded portions of the core wires 61 pressed in the vertical direction when the number of the electric wires 60 is the set number −1. By adding a certain 3σ, the upper limit of the height of the welded portion between the core wires 61 when the number of the electric wires 60 is less than the set number is obtained, and this is set as the lower limit 72. That is, the height of the welded portion between the core wires 61 is slightly different for each combination electric wire 64 even between the combination electric wires 64 having the same number of the electric wires 60, and therefore, a plurality of combinations in which the number of the electric wires 60 is one less than the set number. When the height of the welded portion between the respective core wires 61 in the electric wire 64 is expressed by a numerical value, a single missing range 76 in which the numerical values are dispersed is formed.

  For this reason, when setting the lower limit value 72, all the values of the heights of the core wires 61 when the number of wires 60 is one less than the set number and the numerical values are dispersed are excluded as much as possible. In order to exclude all the heights included in the missing range 76, a value obtained by adding three times the standard deviation σ from the average value of the heights is set as the lower limit value 72. That is, when the upper limit of the single missing range 76 is set as the lower limit value 72 and the height H ′ between the core wires 61 detected by the height displacement sensor 45 is less than or equal to the lower limit value 72, the detected height H ′. Is included in one missing range 76 or less, it is possible to determine that the number of wires 60 is less than the set number.

  Even when the heights of the welded portions of the core wires 61 in the plurality of combination electric wires 64 when the number of the electric wires 60 is the set number are represented by numerical values, a set number range 75 in which the numerical values are dispersed is formed. The set number range 75 is smaller than the lower limit of the additional line range 77 and larger than the upper limit of the single missing range 76. That is, the set number range 75 is located between the upper limit value 71 and the lower limit value 72 set for each set number of the electric wires 60 in the combination electric wire 64, and when the number of the electric wires 60 is the set number. In any case, the height H ′ between the core wires 61 detected by the height displacement sensor 45 indicates any value, and the value is positioned between the upper limit value 71 and the lower limit value 72.

  In addition, it is preferable to set the upper limit value 71 and the lower limit value 72 which are these threshold values on the basis of the thinnest core wire 61 among the some electric wires 60 which comprise the combination electric wire 64. FIG. That is, since the thickness of the core wire 61 differs depending on the type of the electric wire 60, the electric wires 60 constituting the combination electric wire 64 may be combined with the electric wires 60 having the core wires 61 having different thicknesses. For this reason, in such a case, among the electric wires 60 that may be used in the combination electric wire 64, the height when the electric wire 60 having the thinnest core wire 61 is one more or less than the set number is set. It is preferable to set an upper limit value 71 and a lower limit value 72.

  The calculation unit 50 sets the upper limit value 71 and the lower limit value 72 in advance for each set number of the electric wires 60 constituting the combination electric wire 64, and stores them in the storage unit as a database. The abnormality detecting unit 55 has the combination electric wire 64 by comparing the height H ′ of the core wires 61 detected by the height displacement sensor 45 with the upper limit value 71 and the lower limit value 72 stored in this way. An excess or deficiency of the electric wire 60 is detected. That is, the abnormality detection unit 55 pressurizes the core wires 61 with the pair of electrodes 20 in the vertical direction, and based on the height H ′ of the core wires 61 before applying a welding current to the core wire 61, An excess or deficiency, that is, an excess or deficiency of the electric wire 60 is detected. Specifically, the abnormality detection unit 55 determines that the height H ′ of the core wires 61 detected by the height displacement sensor 45 before the welding current is applied to the core wire 61 is equal to or greater than the upper limit value 71. Determines that the number of the electric wires 60 included in the combination electric wire 64 is excessive. In addition, the abnormality detection unit 55 combines the core wires 61 when the height H ′ of the core wires 61 detected by the height displacement sensor 45 before applying the welding current to the core wires 61 is equal to or lower than the lower limit value 72. It determines with the number of the electric wires 60 which the electric wire 64 has is insufficient.

  When it is determined by the abnormality detection unit 55 that the number of the electric wires 60 is not excessive or insufficient, and that the electric wires 60 are not excessive or insufficient (step ST19, No determination) Energization is started (step ST20). That is, a current is passed from the welding transformer 30 to the pair of electrodes 20, and a welding current is alternately passed between the first electrode 21 and the second electrode 22. As a result, a welding current is applied to the core wires 61 of the plurality of electric wires 60 that are in contact with the first electrode 21 and the second electrode 22 while being pressed in the vertical direction, and the welding current is supplied to the core wire 61. Resistance heat is generated and melts. That is, since the core wires 61 of the plurality of electric wires 60 are stacked in the vertical direction and melted while being pressed in a direction to be compressed in the vertical direction, each core wire 61 is deformed and a gap between the core wires 61 is reduced. The overall height of the welded portion overlapping in the vertical direction is lowered.

  Next, it is determined whether or not the height H ′ of the welded portion between the core wires 61 detected by the height displacement sensor 45 has reached the reference welding height H (step ST21). That is, the height H ′ detected by the height displacement sensor 45 is detected by the width displacement sensor 40 in a state where the height is lowered by melting the welded portion between the core wires 61 while being pressed in the vertical direction. The calculation unit 50 determines whether or not the reference welding height H calculated by the calculation unit 50 has been reached based on the weld width W. The height displacement sensor 45 not only detects the height H ′ of the welded portion between the core wires 61 at the time of initial pressurization, but also the height H ′ of the welded portion between the core wires 61 becomes the reference weld height H in this way. Whether or not it has been reached can also be detected.

  When it is determined by this determination that the height H ′ of the welded portion between the core wires 61 detected by the height displacement sensor 45 has not reached the reference welding height H (step ST21, No determination) Pressurization and energization of the welded portions of the core wires 61 are continued. That is, until the height displacement sensor 45 detects that the height H ′ of the welded portion between the core wires 61 reaches the reference weld height H, the welding current continues to flow from the electrode 20 to the welded portion between the core wires 61. The core wires 61 are resistance-welded to each other. The energization time from the start of energization to the stop of energization is displayed on the display 51, and the display 51 displays whether or not the energization time is within an appropriate range.

  On the other hand, when it is determined that the height H ′ of the welded portion between the core wires 61 detected by the height displacement sensor 45 has reached the reference welding height H (step ST21, Yes determination), the core wire 61 is used. Is stopped (step ST22). That is, the sequencer 36 stops energization of the welding current from the electrode 20 to the welding portion between the core wires 61 through the control to the welding timer 35.

  Next, in a state where energization is stopped, the pressure state between the pair of electrodes 20 is held for a certain time (step ST23). Thereby, the core wires 61 are held in a state where they are pressed in a direction in which they are compressed in the vertical direction, and the core wires 61 are cooled. Thereafter, by actuating the electromagnetic valve 17 and activating the air cylinder 15, the pressurization from the electrode 20 to the core wire 61 is released, and the core wires 61 of the plurality of electric wires 60 as materials to be welded are overlapped. End resistance welding. Thereby, the thermocompression bonding between the core wires 61 is completed.

  On the other hand, when it is determined by the abnormality detection unit 55 that the number of the electric wires 60 is excessive or insufficient, thereby determining that the electric wires 60 are excessive or insufficient (step ST19, Yes determination). The display 51 indicates that the electric wire 60 is excessive or insufficient (step ST24). That is, when there is an excess or deficiency in the electric wires 60, the electric wires 60 may not be brought into a desired joined state, and in this case, the display 51 indicates that the electric wires 60 are in excess or deficiency, The combination wire 64 is removed from the wire setting jig 10 without energizing the core wire 61.

  The thermocompression bonding apparatus 1 according to the above embodiment pressurizes the core wires 61 included in the electric wires 60 constituting the combination electric wire 64 in which a plurality of electric wires 60 are combined, and supplies a welding current to the core wires 61. A pair of electrodes 20 for welding the core wires 61 to each other, a height displacement sensor 45 for detecting the height of the core wires 61 stacked in the vertical direction, and a combination based on the detection result of the height displacement sensor 45. An abnormality detection unit 55 that detects an abnormality of the electric wire 64, and the height displacement sensor 45 detects the height of the core wires 61 in a state of being pressurized in the vertical direction by the pair of electrodes 20, and detects the abnormality detection unit 55. Detects the abnormality of the combined electric wire 64 by comparing the heights of the core wires 61 in the state of being pressurized in the vertical direction with a preset threshold value. Accordingly, it is possible to determine whether the electric wire 60 is excessive or insufficient in the process of performing the thermocompression bonding of the core wire 61 of the electric wire 60 without providing a step of counting the number of the electric wires 60 to be thermocompression bonded. As a result, the abnormality of the electric wire 60 can be easily determined.

  Moreover, when determining whether the number of the electric wires 60 included in the combination electric wire 64 is excessive or insufficient with respect to the set number, a threshold for the height of the core wires 61 is set, and the determination is made based on the threshold. Therefore, it is possible to suppress the determination variation due to the variation for each thermocompression bonding apparatus 1. As a result, the excess or deficiency of the electric wires 60 constituting the combination electric wire 64 can be accurately determined.

  Moreover, the upper limit value 71 and the lower limit value 72 of the height of the core wires 61 in the state of being pressed in the vertical direction are set as the threshold value for each set number of the electric wires 60 in the combination electric wire 64, and the abnormality detection unit 55 When the height of the core wires 61 detected by the height displacement sensor 45 is equal to or higher than the upper limit value 71, it is determined that the number of the electric wires 60 is excessive, and the height of the core wires 61 detected by the height displacement sensor 45 is high. Is less than the lower limit 72, it is determined that the number of the electric wires 60 is insufficient. As described above, the upper limit value 71 and the lower limit value 72 of the heights of the core wires 61 detected by the height displacement sensor 45 are set as threshold values for determining the excess or deficiency of the electric wire 60. By comparing the detected heights of the core wires 61 with the upper limit value 71 and the lower limit value 72, the determination based on the heights of the core wires 61 detected by the height displacement sensor 45 can be easily performed. it can. As a result, it is possible to more easily determine whether the electric wire 60 is excessive or insufficient.

  Further, the abnormality detection unit 55 pressurizes the core wires 61 with the pair of electrodes 20 in the vertical direction, and detects an abnormality of the combined electric wire 64 based on the height of the core wires 61 before energizing the welding current to the core wires 61. In order to detect, it can be judged before starting welding of the core wires 61 whether the combination electric wire 64 which has the core wire 61 arrange | positioned between a pair of electrodes 20 has abnormality. As a result, it is possible to prevent unnecessary labor and time from being generated in connection with welding the core wire 61 of the combined electric wire 64 having an abnormality.

  Further, the upper limit value 71 and the lower limit value 72 are set based on the thinnest core wire 61 among the plurality of electric wires 60 constituting the combination electric wire 64, so that the electric wires 60 constituting the combination electric wire 64 can be of a plurality of types. Even when the thick core wire 61 is used, it is possible to more reliably determine whether the electric wire 60 is excessive or insufficient. That is, when the upper limit value 71 and the lower limit value 72 are set with the relatively thick core wire 61 as a reference, the numerical value of the one-increase range 77 and the single-out range 76 greatly increase / decrease with respect to the set number range 75. Become a range. For this reason, when the upper limit value 71 and the lower limit value 72 are set based on the one-increase range 77 or the one-out range 76 in this case, the core wire 61 thinner than the core wire 61 used for this setting may be increased by one. Even if it decreases, the height of the core wire 61 may fall between the upper limit 71 and the lower limit 72. On the other hand, when the upper limit value 71 and the lower limit value 72 are set with the thinnest core wire 61 as a reference, when the number of wires 60 is increased or decreased from the set number, the thickness of the core wire 61 of the wire 60 is increased. Regardless of the height, the height of the core wire 61 is equal to or higher than the upper limit 71 or lower than the lower limit 72. As a result, it is possible to more reliably determine whether the electric wire 60 is excessive or insufficient.

[Modification]
In the thermocompression bonding apparatus 1 according to the above-described embodiment, the abnormality detection unit 55 detects the excess or deficiency of the electric wires 60 based on the heights of the core wires 61 before energizing the welding current to the core wires 61. Although the abnormality of the combination electric wire 64 is detected, the detection of the excess or deficiency of the electric wire 60 may be performed other than before the welding current is supplied to the core wire 61. The abnormality detection unit 55 pressurizes the core wires 61 in the vertical direction with the pair of electrodes 20, applies a welding current to the core wires 61, and welds the core wires 61 to each other based on the height of the core wires 61. 61 excess or deficiency may be detected. That is, when the number of the electric wires 60 constituting the combination electric wire 64 is excessive or insufficient with respect to the set number, the height of the welded portion between the core wires 61 is not only before welding but also after welding. It changes according to excess and deficiency. For this reason, since the determination whether the number of the electric wires 60 is excessive or insufficient with respect to the set number can be performed even after the welding of the core wires 61, the core wires 61 are welded together when performing this determination. You may carry out based on the height of the subsequent core wires 61. FIG.

  Further, whether or not the number of the wires 60 is excessive or insufficient with respect to the set number based on the heights of the core wires 61 detected by the height displacement sensor 45 is determined by energizing the core wire 61 with a welding current. It may be performed both before and after welding the core wires 61 by supplying a welding current to the core wires 61. Thus, the excess / deficiency of the electric wires 60 constituting the combination electric wire 64 can be determined with higher accuracy by determining whether the electric wires 60 are excessive or insufficient before and after the welding of the core wires 61.

  In the thermocompression bonding apparatus 1 according to the above-described embodiment, the core wire detected by the height displacement sensor 45 to determine whether or not the number of the wires 60 constituting the combination wire 64 is excessive or insufficient with respect to the set number. The upper limit value 71 and the lower limit value 72 used when performing based on the height H ′ of 61 are calculated by the above-described formulas (1) and (2). You may calculate by other than Formula (1) and (2). The calculation of the upper limit value 71 and the lower limit value 72 is not limited as long as the method can calculate a value that can determine whether the number of the electric wires 60 is excessive or insufficient with respect to the set number.

  Moreover, about the upper limit 71 and the lower limit 72 with respect to the set number of the electric wires 60, information on the set number of the electric wires 60 is acquired from a device different from the thermocompression bonding apparatus 1, and based on the acquired information on the set number of wires. It is preferable to set appropriately for each combination electric wire 64 to be thermocompression bonded.

  Moreover, in the thermocompression bonding apparatus 1 according to the above-described embodiment, the abnormality detection unit 55 detects the excess or deficiency of the electric wire 60 as an example of the abnormality of the combined electric wire 64. Detections other than 60 excess and deficiency may be performed. The abnormality detection unit 55 may detect, for example, an abnormality in the thickness of the core wire 61 included in the electric wire 60 included in the combination electric wire 64 as the abnormality in the combination electric wire 64. FIG. 13 is an explanatory diagram of a combination electric wire having a core wire whose thickness is different from the setting. Since the cross-sectional area of the core wire 61 when the electric wire 60 is viewed in the extending direction of the electric wire 60 varies depending on the type of the electric wire 60, the combination electric wire 64 is not only the number of the electric wires 60 but also the core wires 61 included in each electric wire 60. It is necessary to use a cross-sectional area having an appropriate cross-sectional area. That is, since the thickness of the electric wire 60 varies depending on the type of the electric wire 60, the combined electric wire 64 needs to have an appropriate thickness for the thickness of the core wire 61 included in each electric wire 60.

  On the other hand, the height of the core wires 61 of the electric wires 60 constituting the combination electric wire 64 varies depending on the thickness of the core wires 61. For example, as shown in FIG. 13, when the electric wire 60 constituting the combination electric wire 64 includes a thick electric wire 66 having a thick core wire 67 that is thicker than the core wire 61 set in advance, The overall height of 61 is higher than the height in the case where all the electric wires 60 are preset. For this reason, the abnormality detection unit 55 determines that the combination wire 64 is abnormal when the height of the core wires 61 detected by the height displacement sensor 45 is equal to or higher than the upper limit 71 or lower limit 72 or less. You may determine with the electric wire 60 from which the thickness of 61 differs from the set thickness.

  Specifically, the upper limit value 71 and the lower limit value 72 that are threshold values used for determination in the abnormality detection unit 55 are set for each thickness of the core wire 61 of the electric wire 60 in the combination electric wire 64, and the height displacement sensor 45 is used. When the detected heights of the core wires 61 are equal to or higher than the upper limit value 71, the abnormality detection unit 55 may determine that the combination wire 64 includes the thick wire 66. Similarly, when the height of the core wires 61 detected by the height displacement sensor 45 is less than or equal to the lower limit value 72, the abnormality detection unit 55 is thicker than the core wire 61 set in advance in the combination wire 64. It may be determined that the electric wire 60 having the thin core wire 61 is included. As described above, even if the number of the wires 60 is an appropriate number by detecting an abnormality in the thickness of the core wire 61 included in the wires 60 constituting the combination wire 64 as an abnormality in the combination wires 64, Abnormalities can be judged more appropriately.

  As described above, even when an abnormality in the thickness of the core wire 61 included in the electric wire 60 constituting the combination electric wire 64 is detected as an abnormality in the combination electric wire 64, the most of the plurality of electric wires 60 constituting the combination electric wire 64 is the most. By setting the upper limit value 71 and the lower limit value 72 with the thin core wire 61 as a reference, an abnormality in the thickness of the core wire 61 can be detected appropriately. By setting the upper limit value 71 and the lower limit value 72 with the thinnest core wire 61 as a reference, the overall cross-sectional area of the core wire 61 is the thinnest core wire with respect to the cross-sectional area of the entire core wire 61 having a preset thickness. It is possible to detect even when the cross-sectional integral and setting of 61 are different from each other, and it is possible to detect that the electric wire 60 having an abnormal thickness of the core wire 61 is used. Thereby, the abnormality of the thickness of the core wire 61 can be detected more appropriately.

  In the thermocompression bonding apparatus 1 according to the above-described embodiment, the air cylinder 15 is used as the means for raising and lowering the first electrode 21, but the means for raising and lowering the first electrode 21 includes other actuators such as a hydraulic cylinder. It may be used. Moreover, although the mechanical sensor was used for the width displacement sensor 40 and the height displacement sensor 45, a reflective or transmissive optical sensor or the like may be used for these sensors. In addition, as a technique for welding the core wires 61, the resistance welding performed by supplying a welding current to the core wires 61 to generate resistance heat generation has been described. However, a technique for welding the core wires 61 is, for example, an ultrasonic wave. Techniques other than resistance welding, such as welding, may be used.

DESCRIPTION OF SYMBOLS 1 Thermocompression bonding apparatus 5 Apparatus main body 10 Electric wire setting jig 12 Holding member 15 Air cylinder 17 Electromagnetic valve 20 Electrode 21 1st electrode 22 2nd electrode 25 Electrode holder 30 Welding transformer 35 Welding timer 36 Sequencer 40 Width displacement sensor 45 Height displacement Sensor (height detector)
50 Calculation part 51 Display 55 Abnormality detection part 60 Electric wire 61 Core wire (conductor part)
62 Covering 64 Combination wire 65 Assembly 71 Upper limit 72 Lower limit

Claims (6)

A pair of electrodes that welds the conductor parts by applying a welding current to the conductor parts while pressing the conductor parts of the electric wires constituting the combination electric wire that combines the plurality of electric wires in the vertical direction. When,
A height detection unit for detecting the height of the conductors stacked in the vertical direction;
Based on the detection result in the height detection unit, an abnormality detection unit for detecting an abnormality in the combination wire,
With
The height detection unit detects the height of the conductors in a state of being pressed up and down by a pair of the electrodes,
The abnormality detection unit detects an abnormality of the combination electric wire by comparing the height of the conductors in a state of being pressurized in the vertical direction with a preset threshold value. . The threshold value is set to the upper limit value and the lower limit value of the height of the conductor portions in a state of being pressed in the vertical direction for each set number of the electric wires in the combination electric wire,
The abnormality detector determines that the number of the electric wires is excessive when the height of the conductors detected by the height detector is equal to or greater than the upper limit value.
The thermocompression bonding apparatus according to claim 1, wherein when the height of the conductor parts detected by the height detection part is equal to or less than the lower limit value, it is determined that the number of the electric wires is insufficient.   2. The thermocompression bonding apparatus according to claim 1, wherein the abnormality detection unit detects an abnormality in a thickness of the conductor portion included in the electric wire constituting the combination electric wire as an abnormality of the combination electric wire.   The abnormality detection unit pressurizes the conductors in the vertical direction by a pair of the electrodes, and the abnormality of the combination electric wire based on the height of the conductors before a welding current is applied to the conductors. The thermocompression bonding apparatus according to any one of claims 1 to 3, wherein the temperature is detected.   The abnormality detection unit pressurizes the conductors in the vertical direction with a pair of electrodes, and applies a welding current to the conductors to weld the conductors to each other. The thermocompression bonding apparatus according to any one of claims 1 to 4, wherein an abnormality of the combination electric wire is detected on the basis of the temperature.   The thermocompression bonding apparatus according to any one of claims 1 to 5, wherein the threshold value is set based on the thinnest conductor portion among the plurality of electric wires constituting the combination electric wire.

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