JP2017073336A - Method of manufacturing wire with heat-shrinkable tube, wire with heat-shrinkable tube, and heat-shrinkable tube attachment device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique of more reliably preventing an adhesive provided between a heat-shrinkable tube and a terminal-equipped wire from flowing to a mating connection portion of the terminal.SOLUTION: A method of manufacturing an electric wire 10 with heat-shrinkable tube includes the following steps (a) and (b). Step (a) is a step of covering a terminal-equipped wire 11 with a heat-shrinkable tube having a discharge through-hole 28h formed in an intermediate portion and disposing an adhesive in the heat-shrinkable tube. Step (b) is a step of discharging the adhesive from the discharge through-hole 28h by thermally shrinking the heat-shrinkable tube.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a technique for attaching a heat-shrinkable tube to a connection portion between an electric wire and a terminal.

  A heat-shrinkable tube may be attached to an electric wire with a terminal for the purpose of water stop or corrosion prevention. At this time, Patent Documents 1 to 3 disclose techniques for suppressing the adhesive provided between the heat-shrinkable tube and the terminal-attached electric wire from flowing out to the mating connection portion of the terminal.

  Since the terminal metal fitting described in Patent Document 1 is formed in a liquid-tight manner by a water blocking wall that is retrofitted between the wire connection portion and the mating connection portion of the terminal main body, it can suppress the outflow of the adhesive. it can.

  The jig for assembling the heat-shrinkable tube described in Patent Literature 2 is provided with a damming wall portion with which one end of the tube of the heat-shrinkable tube is brought into contact, so that the adhesive leaks to the mating connection portion of the terminal. It is said that there is no.

  The ground terminal holder described in Patent Literature 3 is provided with a flow stop member in the holding means that presses and holds the ground terminal, thereby preventing the hot melt eluted by heating from flowing into the ground terminal side. Has been.

JP 2013-164951 A JP 2013-114936 A JP 2006-261655 A

  However, in the inventions described in Patent Documents 1 to 3, the wall portion for stopping the adhesive is provided on the terminal or the jig, and the adhesive crosses the wall when the amount of the adhesive is large. There was a risk of flowing to the connection side.

  Then, this invention aims at providing the technique which can suppress more reliably that the adhesive agent provided between the heat contraction tube and the electric wire with a terminal flows out to the other party connection part of a terminal. .

  In order to solve the above-described problem, a method for manufacturing an electric wire with a heat-shrinkable tube according to a first aspect includes (a) covering the electric wire with a terminal with a heat-shrinkable tube having a discharge through-hole formed in an intermediate portion and the heat shrinking. A step of disposing an adhesive in the tube; and (b) a step of heat-shrinking the heat-shrinkable tube to discharge the adhesive from the discharge through hole.

  The method for manufacturing an electric wire with a heat-shrinkable tube according to the second aspect is a method for manufacturing the electric wire with a heat-shrinkable tube according to the first aspect, and (c) removes the adhesive discharged from the discharge through hole. The process of carrying out is further provided.

  The method for manufacturing the electric wire with heat-shrinkable tube according to the third aspect is a method for manufacturing the electric wire with heat-shrinkable tube according to the second aspect, wherein the step (c) is solidified outside the discharge through hole. Removing the adhesive.

  The manufacturing method of the electric wire with a heat-shrinkable tube which concerns on a 4th aspect is a manufacturing method of the electric wire with a heat-shrinkable tube which concerns on any one 1st-3rd aspect, Comprising: The said process (b) is the said discharge | emission. A step of decompressing the outer space of the outlet of the through hole for the outer space of the opening outlet at both ends of the heat shrinkable tube.

  The manufacturing method of the electric wire with a heat-shrinkable tube which concerns on a 5th aspect is a manufacturing method of the electric wire with a heat-shrinkable tube which concerns on any one 1st-4th aspect, Comprising: The said through-hole for discharge | emission is the said heat | fever. It is formed in the part located in the outer surface side of the electric wire connection part side edge part of the said terminal when the said heat shrinkable tube is covered on the said electric wire with a terminal among shrinkable tubes.

  A method for manufacturing a wire with a heat-shrinkable tube according to a sixth aspect is a method for manufacturing a wire with a heat-shrinkable tube according to any one of the first to fifth aspects, wherein the discharge through-hole is before shrinkage. In this state, it is formed in the shape of a long hole in a direction crossing the axial center direction of the heat-shrinkable tube.

  The electric wire with a heat-shrinkable tube according to a seventh aspect is an electric wire with a heat-shrinkable tube in which a heat-shrinkable tube is attached to a connecting portion between the electric wire and the terminal in the electric wire with a terminal, An adhesive filling the tube is attached to the terminal-attached electric wire, and a discharge through-hole for discharging the excess adhesive is formed in an intermediate portion of the heat-shrinkable tube, and the adhesive passes through the discharge through-hole. Buried.

  An electric wire with a heat-shrinkable tube according to an eighth aspect is an electric wire with a heat-shrinkable tube according to a seventh aspect, wherein the discharge through-hole is an end portion of the terminal on the electric wire connecting portion side of the heat-shrinkable tube. It is formed on the outer surface side.

  The heat-shrinkable tube mounting device according to the ninth aspect is formed so that a workpiece covered with a heat-shrinkable tube before shrinking can be set on the electric wire with terminal, and the discharge formed in the intermediate portion of the heat-shrinkable tube that has been set. A base including an adhesive escape portion capable of releasing the adhesive flowing out from the through-hole, and a heating mechanism provided to heat the heat shrinkable tube in a state where the workpiece is set on the base; Is provided.

  A heat-shrinkable tube mounting device according to a tenth aspect is the heat-shrinkable tube mounting device according to the ninth aspect, and includes a removal mechanism that removes the adhesive discharged outward from the outlet of the discharge through hole. Further prepare.

  A heat-shrinkable tube mounting device according to an eleventh aspect is the heat-shrinkable tube mounting device according to the ninth or tenth aspect, wherein the work is set on the base body and the outlet of the discharge through-hole. The pressure adjusting mechanism is further provided so that the outer space of the heat shrinkable tube can be depressurized relative to the outer space of the opening outlets at both ends of the heat shrinkable tube.

  According to the first to sixth aspects, (a) a step of covering a heat-shrinkable tube having a discharge through hole formed in an intermediate portion on a terminal-attached electric wire and disposing an adhesive in the heat-shrinkable tube; And a step of heat-shrinking the heat-shrinkable tube to discharge the adhesive from the discharge through-hole. Therefore, when the heat-shrinkable tube contracts, excess adhesive is discharged from the discharge through-hole. Thereby, it can suppress more reliably that the adhesive agent provided between the heat contraction tube and the electric wire with a terminal flows out to the other party connection part of a terminal.

  In particular, according to the second aspect, since the method further includes the step (c) of removing the adhesive discharged from the discharge through hole, the adhesive discharged from the discharge through hole is an obstacle when the terminal is connected. Can be suppressed.

  In particular, according to the third aspect, since the step (c) includes a step of cutting off the solidified adhesive outside the discharge through hole, the remaining adhesive is distorted when the excess adhesive is removed. Can be suppressed. Further, when removing the excess adhesive, the adhesive is less likely to adhere to the apparatus, and the maintenance of the apparatus is facilitated.

  In particular, according to the fourth aspect, the step (b) includes a step of decompressing the outer space of the outlet of the discharge through-hole with respect to the outer spaces of the opening outlets at both ends of the heat shrinkable tube. Becomes easier to be discharged from the discharge through-holes than the openings at both ends of the tube.

  In particular, according to the fifth aspect, the discharge through-hole is formed in a portion located on the outer surface side of the end portion of the terminal connected to the electric wire connecting portion when the heat-shrinkable tube is covered with the electric wire with terminal. Therefore, it is difficult for excess adhesive to flow out of the opening at the end of the heat-shrinkable tube on the side of the mating connection portion. Further, when the adhesive leaking from the discharge through-hole is cut out with a cutter or the like, the terminal is interposed between the cutter and the electric wire, so that the electric wire is hardly damaged.

  In particular, according to the sixth aspect, the discharge through-hole is formed in a long hole shape in a direction intersecting with the axial direction of the heat-shrinkable tube in a state before contraction, so that the adhesive is removed from the discharge through-hole. Easily discharged. More specifically, when the heat-shrinkable tube is contracted, the contraction rate in the circumferential direction is usually set larger than the axial direction. Even in this case, if the discharge through hole is formed in the shape of a long hole in the direction intersecting the axial direction, it is possible to suppress the circumferential dimension of the discharge through hole from becoming too small due to contraction, Accordingly, it is possible to suppress a decrease in discharge performance.

  Further, according to the seventh or eighth aspect, the heat shrinkable tube is attached to the terminal-attached electric wire with an adhesive filling the heat shrinkable tube, and discharges excess adhesive to an intermediate portion of the heat shrinkable tube. Since the through hole is formed and the adhesive fills the discharge through hole, the adhesive provided between the heat-shrinkable tube and the electric wire with terminal is more reliably prevented from flowing out to the mating connection part of the terminal. can do.

  In particular, according to the eighth aspect, the discharge through-hole is formed in a portion of the heat shrinkable tube that is located on the outer surface side of the terminal on the side of the electric wire connecting portion, so that excess adhesive is removed from the heat shrinkable tube. Of these, it becomes difficult to flow out from the opening at the end on the counterpart connection side. In addition, when the leaked adhesive is cut off with a cutter or the like, a terminal is interposed between the cutter and the conductor, so that the conductor is hardly damaged.

  In addition, according to the ninth to eleventh aspects, the discharge through hole formed in the intermediate portion of the set heat-shrinkable tube is formed so as to be able to set the work covered with the heat-shrinkable tube before shrinking on the electric wire with terminal. In order to provide heat, the base includes an adhesive escape portion capable of releasing the adhesive flowing out from the hole, and a heating mechanism provided to heat the heat-shrinkable tube in a state where the work is set on the base. When the shrink tube is contracted, excess adhesive is discharged from the discharge through hole to the external space. Thereby, it can suppress more reliably that the adhesive agent provided between the heat contraction tube and the electric wire with a terminal flows out to the other party connection part of a terminal.

  In particular, according to the tenth aspect, the apparatus further includes a removing mechanism for removing the adhesive discharged outside the outlet of the discharge through-hole, so that the adhesive discharged outside the outlet of the discharge through-hole is removed. be able to.

  In particular, according to the eleventh aspect, in a state where the work is placed on the base body, the pressure provided so that the outer space at the outlet of the discharge through hole can be depressurized relative to the outer spaces at the openings at both ends of the heat shrinkable tube. Since the adjustment mechanism is further provided, the adhesive is more likely to flow out of the discharge through hole than the openings at both ends of the heat shrinkable tube.

It is a schematic sectional drawing which shows the electric wire with a heat contraction tube which concerns on embodiment. It is a perspective view which shows the heat contraction tube before shrinkage | contraction. It is a partial schematic sectional drawing which shows the heat contraction tube attachment apparatus which concerns on embodiment. It is a partial schematic sectional drawing which shows the state by which the workpiece | work was set to the heat contraction tube attachment apparatus which concerns on embodiment. It is a schematic sectional drawing which shows 1 process of the manufacturing method of the electric wire with a heat contraction tube which concerns on embodiment. It is a schematic sectional drawing which shows 1 process of the manufacturing method of the electric wire with a heat contraction tube which concerns on embodiment.

{Embodiment}
Hereinafter, the manufacturing method of the electric wire with a heat contraction tube which concerns on embodiment is demonstrated. For convenience of explanation, after first describing the heat-shrinkable tube-attached electric wire to be produced and the heat-shrinkable tube mounting device for producing the same, a method for producing the heat-shrinkable tube-attached electric wire will be explained.

<Electric wire with heat shrinkable tube>
First, the heat shrinkable tube-attached electric wire 10 will be described with reference to FIGS. 1 and 2. Drawing 1 is an outline sectional view showing electric wire 10 with a heat contraction tube concerning an embodiment. FIG. 2 is a perspective view showing the heat shrinkable tube 28B before shrinkage.

  The heat-shrinkable tube-equipped electric wire 10 includes an electric wire 13, a terminal 18, and a heat-shrinkable tube 28. Specifically, the heat-shrinkable tube 28 is attached to the electric wire with terminal 11 in which the terminal 18 is attached to the electric wire 13 to form the electric wire 10 with heat-shrinkable tube.

  The electric wire 13 includes a core wire portion 14 and a covering portion 16 formed around the core wire portion 14. The core wire portion 14 is formed in a linear shape from a conductive material such as copper, copper alloy, aluminum, or aluminum alloy. Here, the core wire portion 14 has a configuration in which a plurality of strands are twisted together. But the core wire part may be comprised by the single wire. The covering portion 16 is formed by extruding the insulating resin material around the core wire portion 14 by an extrusion device or the like. The core wire portion 14 is exposed at the distal end portion of the electric wire 13, and an exposed core wire portion 14a having a predetermined length is formed.

  The terminal 18 is a member formed by, for example, pressing a plate material formed of copper or a copper alloy. The surface of the terminal 18 may be tin-plated or the like. Here, a ground terminal is assumed as the terminal 18.

  The terminal 18 includes a counterpart connection part 20, a wire connection part 22, and a connection part 26. The mating side connection part 20 and the wire connection part 22 are connected in a straight line via the connection part 26.

  The counterpart connection part 20 is formed in a plate shape. The counterpart connection part 20 is formed in, for example, an elliptical plate shape, a circular plate shape, or a square plate shape. A hole 20 h is formed in the mating connection portion 20. Bolts 32 are inserted into the holes 20h. Although the hole 20h is described as being formed in a circular shape, it is not always necessary.

  The electric wire connecting portion 22 includes a core wire crimping portion 23 and a covering crimping portion 24. A coated crimping portion 24 is formed on the opposite side of the core wire crimping portion 23 from the counterpart connection portion 20. The core wire crimping part 23 has a configuration in which a pair of crimping pieces 23b are extended and formed on both sides of the bottom part 23a. Then, the pair of crimping pieces 23b are caulked to the exposed core part 14a in a state where the exposed core part 14a is disposed on the bottom 23a. Further, the cover crimping portion 24 is configured such that a pair of crimping pieces 24b are extended and formed on both side portions of the bottom portion 24a. The bottom 24a is continuous with the bottom 23a. The pair of crimping pieces 24 b are caulked to the covering portion 16 in a state where the end portion of the covering portion 16 is disposed on the bottom portion 24 a. Thereby, the end portion of the electric wire 13 is connected to the electric wire connecting portion 22 of the terminal 18. Here, the bottom 24a of the cover crimping portion protrudes outside the bottom 23a of the core crimping portion, but this is not always necessary.

  Note that the coated crimping portion 24 may be omitted. Further, the exposed core wire portion 14a may be connected to the electric wire connecting portion by ultrasonic welding, resistance welding, soldering, or the like.

  The connecting portion 26 is formed in a plate shape, and connects the counterpart connection portion 20 and the bottom portion 23 a of the wire connection portion 22. The counterpart connection part 20 and the coupling part 26 extend in the same plane.

  The heat shrinkable tube 28 is a member that covers the connection portion 12 between the terminal 18 and the electric wire 13. Here, a heat-shrinkable tube 28B before heat shrinkage (hereinafter, the symbol attached after the name is distinguished from the heat-shrinkable tube 28B before heat-shrink and the heat-shrinkable tube 28 after heat-shrinkage) covers the connecting portion 12. The heat shrinkable tube 28 is formed by heat shrinking in the above state. The heat-shrinkable tube 28B is obtained by cooling a resin member formed into a tubular shape by extrusion molding after being stretched into a thick tubular shape after being subjected to a crosslinking treatment. The heat-shrinkable tube 28B thus obtained has a shape memory characteristic that, when heated, shrinks to a thin tubular shape before being stretched.

  The heat-shrinkable tube 28 is heat-shrinked in a shape corresponding to the outer shape of the connection portion 12 and is in close contact with the surface of the connection portion 12 as much as possible. A hot melt 29 is provided as an adhesive inside the heat shrinkable tube 28B. For example, the hot melt 29 is formed on the entire inner peripheral surface of the heat shrinkable tube 28B. When the heat-shrinkable tube 28B is thermally shrunk, the hot melt 29 is softened or melted to fill the gap between the surface of the connecting portion 12 and the inner surface of the heat-shrinkable tube 28 as much as possible. When the heat shrinkable tube 28 </ b> B is thermally shrunk, an excessive amount of hot melt 29 that does not fit in the gap may protrude from the end of the heat shrinkable tube 28. Here, a discharge through-hole 28h, which will be described later, is formed in the heat-shrinkable tube 28, and the excess hot melt 29 is released from the discharge through-hole 28h, so that the excess hot-melt 29 becomes the end of the heat-shrink tube 28. , And in particular, it is prevented from protruding outward from the end on the counterpart connection part 20 side.

  As the adhesive, in addition to the hot melt 29, a thermosetting adhesive, a moisture curable adhesive, or the like may be used. In these cases, an adhesive may be applied to the connection portion 12 in advance.

  The terminal 18 is connected to the part 30 to be connected as follows. That is, the bolt 32 is erected on the part 30 to be connected (for example, the ground connection part 30). The peripheral portion of the portion where the bolt 32 is erected in the ground connection portion 30 is formed in a conductive portion by metal or the like. And the other party connection part 20 is arrange | positioned on the earth connection site | part 30 so that the volt | bolt 32 may be penetrated to the hole 20h. Thereafter, the nut 34 is fastened to the bolt 32, and the counterpart connection portion 20 is sandwiched between the ground connection portion 30 and the nut 34. As a result, the counterpart connection portion 20 is fixed in a fixed posture with respect to the ground connection portion 30, and the counterpart connection portion 20 comes into contact with the ground connection portion 30, the bolt 32, and the nut 34. It is electrically connected to the connection site 30.

  Since the terminal 18 contacts the ground connection part 30 and the nut 34 and is electrically connected to the ground connection part 30 as described above, the hot melt 29 is attached to the surface of the mating connection part 20. Then, the electrical connection between the mating connector 20 and the ground connection part 30 or the nut 34 becomes unstable. As described above, here, the discharge through hole 28h is formed in the heat shrinkable tube 28, so that the excess of the hot melt 29 is released from the discharge through hole 28h, and the hot melt 29 is connected to the mating connection portion. Adhering to the surface of 20 is suppressed.

  The discharge through hole 28h is a portion for discharging excess adhesive when the heat shrinkable tube 28 contracts. In the heat shrinkable tube-attached electric wire 10, the discharged adhesive fills the discharge through hole 28h.

  Specifically, the discharge through-hole 28h is formed in the middle portion of the heat shrinkable tube 28, more specifically, when the heat shrinkable tube 28 of the heat shrinkable tube 28 is covered with the connecting portion 12, the rear of the terminal 18. It forms so that it may be located in the outer surface side of an end side (electric wire connection part 22 side edge part). In particular, here, the discharge through hole 28 h is formed so as to be located outside the covering crimping portion 24. Since the discharge through hole 28 h is positioned outside the terminal 18, the terminal 18 is interposed between the cutter and the electric wire 13 when the adhesive discharged from the discharge through hole 28 h is cut with a cutter or the like. Thereby, it is suppressed that the electric wire 13 is damaged by a cutter.

  The heat-shrinkable tube 28 is covered so that the discharge through hole 28h is positioned outside the bottom 24a, not the crimping piece 24b. This is because even if the type of the terminal 18 changes, the shape on the bottom side does not change so much, so that the heat shrinkable tube 28B can be easily shared.

  Here, the discharge through-hole 28h is formed in a long hole shape in a direction intersecting with the axial direction of the heat-shrinkable tube 28B before being contracted. Thereby, the adhesive is easily discharged from the discharge through hole 28h. More specifically, in the heat-shrinkable tube 28B, it is desirable that the contraction rate in the axial direction is set as small as possible and the contraction rate in the circumferential direction is set as large as possible. The shrinkage rate in the direction is set large. Even in this case, if the discharge through hole 28h is formed in the shape of a long hole in the direction intersecting the axial direction, it is possible to suppress the circumferential dimension of the discharge through hole 28h from being too small due to the contraction. Therefore, a decrease in discharge performance can be suppressed. It should be noted that it is desirable to set the shrinkage rate in the axial direction as small as possible in the heat shrinkable tube 28B. For example, if the shrinkage rate in the axial direction is large, a portion to be covered with the heat shrinkable tube 28 is exposed during shrinkage. This is because there is a risk of losing. In addition, it is desirable to set the shrinkage rate in the circumferential direction as large as possible in the heat shrinkable tube 28B. For example, the larger the shrinkage rate in the circumferential direction, the more the heat shrinkable tube 28B can be covered. This is because the range of the size of the terminal-attached electric wire 11 can be expanded and the heat-shrinkable tube 28B can be easily covered with the terminal-attached electric wire 11.

  The shape of the discharge through hole 28h can be set as appropriate, such as a circular shape, an elliptical shape, or a square shape. However, the shape of the discharge through hole 28h is preferably formed in a shape in which the inner peripheral surface is smoothly continuous in the circumferential direction, such as a circular shape or an elliptical shape. Thereby, it can suppress that the heat contraction tube 28 tears from the periphery of the through-hole 28h for discharge | emission. Here, the discharge through hole 28h is formed in an elliptical shape that is long in the circumferential direction in the heat shrinkable tube 28B.

  Such a discharge through-hole 28h may be provided in a tubular member in a stage before being stretched or may be provided in a tubular member after being stretched in manufacturing the heat-shrinkable tube 28B. In order to provide the discharge through hole 28h in the tubular member, for example, it may be possible to provide a hole corresponding to half of the discharge through hole 28h on the side edge of the tubular member that has been crushed and doubled. It is done.

  The heat shrinkable tube mounting device 40 to be described next is a device for making it easy for excess hot melt 29 inside the heat shrinkable tube 28B to be discharged from the discharge through hole 28h when heat shrinking the heat shrinkable tube 28B.

<About heat shrinkable tube mounting device>
FIG. 3 is a partial schematic cross-sectional view showing the heat-shrinkable tube mounting device 40 according to the embodiment. FIG. 4 is a partial schematic cross-sectional view showing a state in which the workpiece W is set in the heat-shrinkable tube mounting device 40 according to the embodiment.

  The heat-shrinkable tube mounting device 40 includes a base body 50 and a heating mechanism 70. Furthermore, here, the heat-shrinkable tube mounting device 40 includes a removal mechanism and a decompression device.

  The base body 50 is formed so as to be able to set a work W in which the heat-shrinkable tube 28 </ b> B before contraction is covered on the terminal-attached electric wire 11. The base body 50 is formed so that the adhesive discharged from the discharge through hole 28h can be released outward. Specifically, the base body 50 includes a main body portion 52 and an adhesive relief portion 60.

  The main body 52 is formed so that the workpiece W can be set. Specifically, the main body portion 52 includes a frame 54, a terminal positioning portion, and a tube positioning portion. Here, the main body 52 can set the workpiece W in such a direction that the discharge through hole 28h faces downward in the vertical direction.

  The frame 54 is a portion that comes into contact with the outer surface of the workpiece W, particularly here, the outer surface of the heat shrinkable tube 28B when the workpiece W is set. Here, the outer surface of the heat shrinkable tube 28 </ b> B located outside the bottom surface of the terminal 18 (outside the main surface opposite to the electric wire 13 side) is provided in contact with the frame 54.

  The terminal positioning part is a part that suppresses the displacement of the terminal 18 when the workpiece W is set. Here, the terminal positioning portion includes positioning pins 56 projecting from the frame 54. The positioning pin 56 is formed at a position corresponding to the hole 20h of the counterpart connection portion 20 when the workpiece W is set. Then, the terminal 18 is positioned with respect to the base body 50 by inserting the positioning pin 56 into the hole 20h.

  The tube positioning portion is a portion that suppresses the displacement of the heat shrinkable tube 28B when the workpiece W is set. Here, the tube positioning portion includes a pressing portion 58 that presses the heat shrinkable tube 28 </ b> B against the frame 54. The pressing portion 58 is provided at a position where the front end portion of the heat shrinkable tube 28B can be pressed when the workpiece W is set. The pressing portion 58 presses the front end portion of the heat-shrinkable tube 28B against the frame 54, whereby the heat-shrinkable tube 28B is positioned with respect to the base body 50.

  However, the shape of the terminal positioning portion is not limited to the above. For example, the terminal positioning part may include a holding part that holds a part of the terminal 18. Similarly, the shape of the tube positioning portion is not limited to the above. For example, the tube positioning portion may include a contact portion that contacts the tube from the front and rear.

  The adhesive release part 60 is formed so that the adhesive flowing out from the discharge through hole 28h can be released in a state where the workpiece W is set. Therefore, the adhesive relief portion 60 is formed so as not to block the discharge through hole 28h in a state where the workpiece W is set. Here, as the adhesive escape portion 60, in a state where the workpiece W is set in the frame 54, the escape hole 62h is formed at a position corresponding to the discharge through hole 28h, and the outlet of the escape hole 62h is the space S. Facing. Thereby, the hot melt 29 discharged from the discharge through hole 28h is discharged through the escape hole 62h to the space S outside the escape hole 62h. The escape hole 62h is preferably formed to be equal to or larger than the discharge through hole 28h before contraction. Thereby, it is possible to prevent a part of the discharge through hole 28h from being blocked by the periphery of the escape hole 62h.

  Here, the space S outside the escape hole 62h is a closed space S whose periphery is surrounded by the wall 64 except for the escape hole 62h and a portion for attaching a nozzle 94 described later of the pressure adjusting mechanism. ing. Thereby, the closed space S can be decompressed by the pressure adjusting mechanism.

  Here, in the portion of the frame 54 where the adhesive escape portion 60 is provided, a recess 54h is formed so that the surface facing the workpiece W is recessed compared to the surrounding portion. This is because the bottom portion 24a of the cover crimping portion 24 of the terminal 18 protrudes outward, and this corresponds to the fact that the discharge through hole 28h is positioned outside this portion. The portion of the heat shrinkable tube 28B corresponding to the recess 54h may initially float, but as the heat shrinkage proceeds, the heat shrinkable tube 28 is formed in a shape corresponding to the recess 54h, and eventually The outer surface of the contraction tube 28 contacts the inner peripheral surface of the recess 54h, and the discharge through hole 28h and the escape hole 62h are close to each other.

  Furthermore, in order to enable decompression of the space outside the escape hole 62h, the escape hole 62h is closed during heat shrinkage. More specifically, here, when the heat-shrinkable tube 28 contracts, its outer surface contacts the entire periphery of the escape hole 62h, and the inside of the discharge through-hole 28h is filled with the hot melt 29. The escape hole 62h is covered. Here, the lid has a double structure because the peripheral edge of the recess 54h is in contact with the outer surface of the heat-shrinkable tube 28 over the entire circumference.

  The heating mechanism 70 is provided so as to heat the heat-shrinkable tube 28 </ b> B in a state where the workpiece W is set on the base body 50. In the example shown in FIG. 1, the heating mechanism 70 is provided at a position away from the heat-shrinkable tube 28 </ b> B, but it is not always necessary. Further, the heating mechanism 70 may be in any form of heat conduction, advection, and heat radiation. For example, the frame 54 may be heated.

  The removal mechanism is provided so as to be able to remove the adhesive discharged to the outside from the outlet of the discharge through hole 28h. Here, the removing mechanism is provided outside the escape hole 62h, and can remove the adhesive discharged from the escape hole 62h to the outside space. Specifically, here, the removal mechanism includes a cutter 80 provided so as to be able to cut the solidified adhesive.

  The cutter 80 includes a pair of blades 82 facing each other with the outlet of the escape hole 62h interposed therebetween. The pair of blades 82 are provided so as to be able to approach and move apart. And the hot melt 29 can be cut | disconnected by moving a pair of blade 82 approaching in the state which the hot melt 29 discharged | emitted from the escape hole 62h solidified.

  The pressure adjustment mechanism is provided so that the outer space of the outlet of the discharge through hole 28h can be depressurized with respect to the outer spaces of the outlet outlets at both ends of the heat shrinkable tube 28B in a state where the workpiece W is set on the base body 50. . Here, the pressure adjustment mechanism includes a decompression mechanism 90 that decompresses the outer space (here, the closed space S) at the outlet of the discharge through hole 28h.

  The decompression mechanism 90 includes an ejector 92 and a nozzle 94. The nozzle 94 connects the closed space S outside the escape hole 62 h and the ejector 92. When the heat-shrinkable tube 28B is heat-shrinked, the air in the closed space S is discharged through the nozzle 94 by operating the ejector 92. Thereby, the closed space S outside the escape hole 62h, that is, the outer space at the outlet of the discharge through hole 28h can be decompressed.

  The decompression mechanism 90 depressurizes the space outside the outlet of the discharge through-hole 28h, so that the excess adhesive inside the heat-shrinkable tube 28 is not from the opening at both ends of the heat-shrinkable tube 28 but from the discharge through-hole 28h. It becomes easy to flow so that it flows out.

  Note that, by reducing the pressure of the closed space S outside the escape hole 62h, the peripheral edge of the discharge through hole 28h of the heat shrinkable tube 28 may protrude from the inside of the escape hole 62h or from the escape hole 62h to the outside. Even in this case, when the cutter 80 is provided outside the escape hole 62h, it is possible to prevent the cutter 80 from cutting part of the heat shrinkable tube 28 when the hot melt 29 discharged is cut. can do.

<Manufacturing method>
Next, the method to manufacture the electric wire 10 with a heat contraction tube using the said heat contraction tube attachment apparatus 40 is demonstrated.

  First, as shown in FIG. 4, the workpiece W is formed and the workpiece W is set in the heat shrinkable tube mounting device 40.

  Specifically, first, a heat shrinkable tube 28 </ b> B in which a discharge through hole 28 h is formed in an intermediate portion is placed on the connecting portion 12 of the terminal-attached electric wire 11 and an adhesive is disposed in the heat shrinkable tube 28. More specifically, a hot melt 29 is applied as an adhesive to the inner surface of the heat shrinkable tube 28B in advance. Then, the heat shrinkable tube 28 </ b> B to which the hot melt 29 is applied is put on the connecting portion 12. At this time, the discharge through hole 28 h is placed so as to be positioned on the outer surface side of the bottom 24 a of the cover crimping portion 24 of the terminal 18. Thereafter, the workpiece W is set on the base body 50. More specifically, the positioning pin 56 projecting from the frame 54 is inserted into the hole of the mating connector 20 of the terminal 18 to position the terminal 18. Thereby, the electric wire 11 with a terminal is positioned. The pressing portion is in a state where the heat-shrinkable tube 28 is covered with a predetermined position in a predetermined direction with respect to the terminal-attached electric wire 11, that is, in a state where the discharge through hole 28h is positioned at a position facing the escape hole 62h. The front end of the heat shrink tube 28 is pressed against the frame 54 by 58 to position the heat shrink tube 28. Therefore, in a state where the workpiece W is set, the discharge through hole 28h is directed downward in the vertical direction.

  Next, as shown in FIG. 5, the heat-shrinkable tube 28 is heated by the heating mechanism 70 and thermally contracted, and the adhesive is discharged from the discharge through hole 28 h. At this time, here, the outer space at the outlet of the discharge through hole 28 h is decompressed with respect to the outer space at the opening outlet at both ends of the heat shrinkable tube 28.

  More specifically, when the heat-shrinkable tube 28B is heated, the heat-shrinkable tube 28B transitions to return to a thin tube before being stretched. In the middle of this, the thermal contraction of the heat shrinkable tube 28 </ b> B is inhibited by the connecting portion 12, and the heat shrinkable tube 28 is thermally contracted into a shape corresponding to the outer shape of the connecting portion 12. The hot melt 29 in the heat shrinkable tube 28B is softened or melted by the heat of the heating mechanism 70, further receives the heat shrinkage of the heat shrinkable tube 28B, fills the gap between the connecting portion 12 and the heat shrinkable tube 28, and an excess amount. Tends to flow out of the opening of the heat shrink tube 28. At this time, since the discharge through hole 28h is formed in the heat shrinkable tube 28B here, at least a part of the surplus of the hot melt 29 that has conventionally protruded from both ends of the heat shrinkable tube 28 is discharged through the discharge through hole. It will be discharged from 28h.

  Furthermore, since the outer space of the outlet of the discharge through hole 28h is decompressed with respect to the outer space of the opening outlet at both ends of the heat shrinkable tube 28, more excess hot melt 29 is discharged through the discharge through hole. It is discharged from 28h. More specifically, the outer space at the outlet of the discharge through hole 28h (here, the closed space S outside the escape hole 62h) is depressurized by the depressurization mechanism 90, whereby the excess hot melt in the heat shrink tube 28 is obtained. Among 29, those located in the vicinity of both end openings are easier to be discharged from the discharge through holes 28h than those in the vicinity of the discharge through holes 28h before flowing out from the both end openings. As a result, the excess adhesive in the heat-shrinkable tube 28 is located at a position farther from the discharge through hole 28h (for example, located near the opening at both ends than the discharge through hole 28h). It flows toward the through hole 28h and is discharged from the discharge through hole 28h. That is, even if the discharge through hole 28h is formed, if there is no pressure reducing mechanism 90, the surplus that would flow out from the opening at both ends is discharged from the discharge through hole 28h by providing the pressure reducing mechanism 90. The

  Here, since the discharge through hole 28h is set in a state of facing downward in the vertical direction, the hot melt 29 is easily discharged from the discharge through hole 28h due to gravity.

  Next, when the heat-shrinkable tube 28B contracts to a predetermined size by heating for a predetermined time, the heating mechanism 70 is stopped. Then, as shown in FIG. 6, the hot melt 29 discharged from the discharge through hole 28h is removed. Here, the hot melt 29 solidified outside the discharge through hole 28h is removed.

  More specifically, the portion of the hot melt 29 that has flowed out of the discharge through hole 28h except for the portion that hangs down as a drop (hereinafter referred to as discharge portion 29a) is heated through the discharge through hole 28h. The hot melt 29 located inside the shrinkable tube 28 remains connected. The discharge portion 29a is solidified at an appropriate stage after being discharged from the discharge through-hole 28h (for example, when an appropriate time has elapsed after the heating by the heating mechanism 70 is stopped). When the discharge portion 29a is solidified, the pair of blades 82 are moved close to each other, and a portion of the discharge portion 29a located outside the escape hole 62h is cut out.

  By cutting off the hot melt 29, it is possible to prevent the discharge portion 29a from interfering when the terminal 18 is connected to the portion 30. Moreover, it can suppress that the remaining discharge part 29a becomes an irregular shape. In addition, since the solidified hot melt 29 is removed, when the excess hot melt 29 is removed, the hot melt 29 is less likely to adhere to the heat shrinkable tube mounting device 40 such as the cutter 80 and the like. Maintenance becomes easy.

  After the hot melt 29 is removed by the removing mechanism, the workpiece W is removed from the heat shrinkable tube mounting device 40. Thereby, the heat shrinkable tube-attached electric wire 10 in which the heat-shrinkable tube 28 is attached to the terminal-attached electric wire 11 is completed. At this time, the discharge through hole 28 h of the heat shrinkable tube 28 is filled with the hot melt 29 here. Further, here, since at least a part of the hot melt 29 discharged from the discharge through hole 28h is removed by the removing mechanism, the removed trace (here, by the cutter 80) in the electric wire with heat shrinkable tube 10 is removed. Resection marks remain. Here, since the portion located outside the escape hole 62h is cut out of the discharge portion 29a, the base end side of the discharge portion 29a remains. Of course, the base end side of the discharge part 29a may be cut off in a subsequent process.

<Effects>
According to the manufacturing method of the electric wire 10 with a heat-shrinkable tube configured as described above, the heat-shrinkable tube 28B having the discharge through-hole 28h formed in the intermediate portion is thermally contracted, and the hot melt 29 is discharged from the discharge through-hole 28h. Therefore, excess hot melt 29 is discharged from the discharge through hole 28h when the heat shrinkable tube 28B is contracted. Thereby, it can suppress more reliably that the hot melt 29 provided between the heat contraction tube 28 and the electric wire 11 with a terminal flows out to the other party connection part 20 of the terminal 18. FIG.

  Further, since the hot melt 29 discharged from the discharge through hole 28h is removed, the hot melt 29 discharged from the discharge through hole 28h can be prevented from becoming an obstacle when the terminal 18 is connected. .

  Further, since the hot melt 29 solidified outside the discharge through-holes 28h is excised, it is possible to suppress the remaining hot melt 29 from becoming an irregular shape when the excess hot melt 29 is removed. Further, when removing the excess hot melt 29, the hot melt 29 is less likely to adhere to the apparatus, and the maintenance of the apparatus is facilitated.

  Further, since the outer space at the outlet of the discharge through hole 28h is depressurized with respect to the outer space of the opening outlet at both ends of the heat shrinkable tube 28, excess hot melt 29 is discharged from the openings at both ends of the tube. It becomes easy to be discharged from.

  Further, the discharge through hole 28h is formed in a portion of the heat shrinkable tube 28 that is located on the outer surface side of the end portion of the terminal 18 on the side of the wire connecting portion 22 when the heat shrinkable tube 28 is covered with the terminal-attached electric wire 11. Therefore, it is difficult for excess hot melt 29 to flow out of the opening at the end of the heat shrinkable tube 28 on the counterpart connection portion 20 side. Further, when the adhesive leaking from the discharge through hole 28h is cut out by the cutter 80 or the like, the terminal 18 is interposed between the cutter 80 and the electric wire 13, so that the electric wire 13 is hardly damaged.

  Further, since the discharge through hole 28h is formed in a long hole shape in a direction crossing the axial center direction of the heat shrinkable tube 28B before being contracted, the adhesive is easily discharged from the discharge through hole 28h. More specifically, the heat shrinkable tube 28B is usually set to have a larger shrinkage rate in the circumferential direction than in the axial direction when shrinking. Even in this case, if the discharge through hole 28h is formed in the shape of a long hole in the direction intersecting the axial direction, it is possible to suppress the circumferential dimension of the discharge through hole 28h from being too small due to the contraction. Therefore, a decrease in discharge performance can be suppressed.

{Modification}
In the embodiment, the pressure adjusting mechanism has been described as including the pressure reducing mechanism 90, but this is not essential. It is also conceivable that the pressure adjusting mechanism includes a pressurizing mechanism that pressurizes the outer space of the opening outlet at both ends of the heat shrinkable tube 28. In this case, it is conceivable that the pressurizing mechanism is operated alone, or that the pressurizing mechanism and the decompression mechanism 90 are used in combination.

  Further, in the embodiment, the removal mechanism has been described as including the cutter 80 for cutting the solidified hot melt 29, but this is not essential. It is also conceivable that the removal mechanism includes a brush that brushes the softened hot melt 29. In this case, it is also conceivable that the hot melt 29 that cannot be removed when the hot melt 29 is removed by printing with a brush spreads thinly on the outer surface of the heat shrinkable tube 28. At this time, in the electric wire with heat-shrinkable tube, it is conceivable that traces printed with a brush remain on the hot melt 29 spreading on the outer surface of the heat-shrinkable tube 28.

  In addition, each structure demonstrated by the said embodiment and each modification can be suitably combined unless it mutually contradicts.

  As described above, the present invention has been described in detail. However, the above description is illustrative in all aspects, and the present invention is not limited thereto. It is understood that countless variations that are not illustrated can be envisaged without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 10 Electric wire with heat shrinkable tube 11 Electric wire with terminal 12 Connection part 13 Electric wire 18 Terminal 20 Opposite side connection part 20h Hole 22 Electric wire connection part 26 Connection part 28, 28B Heat shrinkable tube 28h Discharge through-hole 29 Hot melt 29a Discharge part 40 Heat Shrinkable tube mounting device 50 Base body 60 Adhesive escape portion 62h Relief hole 70 Heating mechanism 80 Cutter 90 Depressurization mechanism S Closed space

Claims (11)

(A) covering the heat-shrinkable tube having the discharge through-hole formed in the intermediate portion on the electric wire with terminal and disposing an adhesive in the heat-shrinkable tube;
(B) heat shrinking the heat shrinkable tube to discharge the adhesive from the discharge through hole;
A method for manufacturing an electric wire with a heat-shrinkable tube. It is a manufacturing method of the electric wire with a heat contraction tube of Claim 1,
(C) The manufacturing method of the electric wire with a heat contraction tube further provided with the process of removing the adhesive agent discharged | emitted from the said through-hole for discharge | emission. It is a manufacturing method of the electric wire with a heat contraction tube of Claim 2,
The said process (c) is a manufacturing method of the electric wire with a heat contraction tube including the process of excising the said adhesive agent solidified outside the said through-hole for discharge | emission. It is a manufacturing method of the electric wire with a heat contraction tube according to any one of claims 1 to 3,
The step (b) is a method of manufacturing an electric wire with a heat-shrinkable tube, including a step of reducing the pressure of the outer space at the outlet of the discharge through-hole with respect to the outer space of the opening outlet at both ends of the heat-shrinkable tube. It is a manufacturing method of the electric wire with a heat contraction tube of any one of Claims 1-4, Comprising:
The discharge through hole is formed in a portion of the heat shrinkable tube that is located on the outer surface side of the end of the wire connecting portion of the terminal when the heat-shrinkable tube is put on the electric wire with terminal. Manufacturing method of electric wire with contraction tube. It is a manufacturing method of the electric wire with a heat contraction tube of any one of Claims 1-5,
The method of manufacturing an electric wire with a heat-shrinkable tube, wherein the discharge through-hole is formed in a long hole shape in a direction intersecting with the axial direction of the heat-shrinkable tube before being contracted. A heat-shrinkable tube-equipped electric wire in which a heat-shrinkable tube is attached to the connecting portion of the electric wire and terminal in the electric wire with terminal,
The heat shrinkable tube is attached to the terminal-attached electric wire by an adhesive filling the heat shrinkable tube,
An electric wire with a heat-shrinkable tube, wherein a discharge through-hole for discharging the excess adhesive is formed in an intermediate portion of the heat-shrinkable tube, and the adhesive fills the discharge through-hole. It is an electric wire with a heat contraction tube according to claim 7,
The said discharge through-hole is an electric wire with a heat contraction tube currently formed in the outer surface side of the electric wire connection part side edge part of the said terminal among the said heat contraction tubes. It is possible to set the work that covered the heat-shrinkable tube before shrinking on the electric wire with terminal, and it is possible to release the adhesive flowing out from the discharge through hole formed in the middle part of the set heat-shrinkable tube A substrate including an adhesive release portion,
A heating mechanism provided to heat the heat-shrinkable tube in a state where the workpiece is set on the substrate;
A heat shrinkable tube mounting device. The heat-shrinkable tube mounting device according to claim 9,
A heat-shrinkable tube mounting device further comprising a removal mechanism for removing the adhesive discharged to the outside from the outlet of the discharge through hole. The heat-shrinkable tube mounting device according to claim 9 or 10,
In the state where the work is set on the substrate, the pressure adjusting mechanism is further provided so that the outer space of the outlet of the discharge through hole can be depressurized with respect to the outer spaces of the opening outlets at both ends of the heat shrinkable tube. , Heat shrink tube mounting device.

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