A wire harness terminal crimping method and its crimping equipment

Abstract

The present invention relates to the technical field of conductive connection, and particularly relates to a method for crimping a wire harness terminal and its crimping equipment. The method for crimping a wire harness terminal includes the following steps: a. First, use a cutting tool to cut a circle around the periphery of the insulating skin at one end of the cable, so that the insulating skin at one end of the cable is cut off. The cut insulating skin forms a sheath that can move around the core. Set the axis of the cable to extend in the front-rear direction. The sheath is located at the front end of the cable and can move forward around the core; b. Move the sheath forward by a set distance. A part of the rear end of the sheath is sleeved outside the core to wrap the core. There is an exposed core between the sheath and the uncut insulating skin at the rear; c. Crimp the wire harness terminal outside the exposed core. The present invention avoids the problem of the core diverging in all directions, improves the crimping efficiency, and ensures tight crimping.

Description

Technical Field

[0001] The present invention relates to the technical field of conductive connection, and particularly relates to a wire harness terminal crimping method and its crimping device. Background Art

[0002] In the field of conductive connection, whether the wire harness terminal connection is tight greatly affects the working state of the cable. Therefore, the tight crimping of the wire harness terminal is very important. In the prior art, as disclosed in a Chinese invention patent with the authorization announcement number CN117810740B, a wire harness terminal, a wire harness terminal crimping device and a wire harness terminal crimping process, before crimping a wire harness terminal at one end of a cable, first remove a section of the insulating skin at one end of the cable to expose a section of the wire core inside. Then, use a crimping device to crimp the wire harness terminal outside the wire core, thereby realizing the conductive connection between the wire harness terminal and the wire core inside the cable. The cable connected with the wire harness terminal can be used to connect with other electrical components for use.

[0003] For some cables, the wire core inside is composed of many relatively thin metal wires. After removing the insulating skin outside the cable, since the metal wires lose the tightening effect of the insulating skin, they often diverge in all directions, which brings difficulties to the crimping process of the wire harness terminal, and it is easy to have the problem that the wire harness terminal is not crimped tightly, thereby reducing the crimping efficiency of the wire harness terminal, and there are also potential electrical safety hazards. Summary of the Invention

[0004] To overcome the deficiencies of the prior art, the present invention provides a wire harness terminal crimping method and its crimping device to solve the technical problems in the prior art that the metal wires are prone to diverge in all directions, resulting in difficulties in crimping the wire harness terminal and easy occurrence of loose crimping.

[0005] The wire harness terminal crimping method and its crimping device of the present invention adopt the following technical solutions:

[0006] A wire harness terminal crimping method includes the following steps: a. First, use a cutting tool to cut a circle along the circumference around the insulating skin at one end of the cable, so that the insulating skin at one end of the cable is cut off. The cut insulating skin forms a leather sleeve that can move around the wire core. Set the axis of the cable to extend in the front-rear direction. The leather sleeve is located at the front end of the cable and can move forward around the wire core; b. Move the leather sleeve forward by a set distance. A part of the rear end of the leather sleeve is sleeved outside the wire core to wrap the wire core, and there is an exposed wire core between the leather sleeve and the uncut insulating skin at the rear; c. Crimp the wire harness terminal outside the exposed wire core.

[0007] Further, in the above step b, the length of the bare wire core is less than the length of the wire harness terminal. A part of the wire harness terminal is located outside the bare wire core, and the other part is located outside the uncut insulating sheath at the rear. In step c when crimping the wire harness terminal, the wire harness terminal is moved forward relative to the cable, and the front end of the wire harness terminal pushes the sheath forward. When the sheath disengages from the wire core, the entire wire harness terminal is located outside the wire core, and then the entire wire harness terminal is crimped outside the wire core.

[0008] Further, the wire harness terminal includes a U-shaped bottom groove. The U-shaped bottom groove includes a first U-shaped part and a second U-shaped part arranged front and back. The openings of the first U-shaped part and the second U-shaped part face upward. The cable is for being placed inside the first U-shaped part and the second U-shaped part. A plurality of crimping strips are respectively connected to the left and right sides of the first U-shaped part and the second U-shaped part. The front and back length of the first U-shaped part is the same as the length of the bare wire core in step b. The total length of the first U-shaped part and the second U-shaped part is the same as the total length of the wire core exposed after the sheath disengages from the wire core.

[0009] Further, the crimping strip extends in the up-and-down direction in the initial state. The crimping strip includes an upper bending section and a lower bending section arranged one above the other. One of the front and back sides of the lower bending section is connected to the lower end of the upper bending section and the upper end of the U-shaped bottom groove, and the other can be bent toward the direction close to the wire core. The upper bending section extends in the up-and-down direction in the initial state. During the process of crimping the wire harness terminal in step c, first, one side of the lower bending section of a crimping strip is bent toward the wire core direction, and then the upper end of the upper bending section is bent downward so that the crimping strip covers outside the wire core.

[0010] Further, there is a connecting section between the first U-shaped part and the second U-shaped part. The front and back ends of the connecting section are respectively connected to the first U-shaped part and the second U-shaped part. The height of the first U-shaped part is higher than that of the second U-shaped part to form a step between the first U-shaped part and the second U-shaped part. In step c, when the wire harness terminal moves forward relative to the cable, the step between the first U-shaped part and the second U-shaped part is flattened, so that the first U-shaped part and the second U-shaped part are at the same height.

[0011] A wire harness terminal crimping device for implementing the above-mentioned wire harness terminal crimping method, comprising a base, on which there is a translation table capable of sliding in the front-rear direction. The translation table is used to place wire harness terminals and cables. Behind the translation table, there is a clamping mechanism for clamping the cable. On the translation table, there is a locking mechanism for locking the wire harness terminals, so that when the translation table moves forward, it can drive the wire harness terminals to move forward relative to the cable. On the base, vertical arms extending in the up-down direction are respectively arranged on the left and right sides of the translation table. On the opposite sides of the two vertical arms, telescopic arms extending in the left-right direction are respectively arranged. The telescopic arms extend to crimp the wire harness terminals onto the wire cores of the cables.

[0012] Further, the wire harness terminal includes a U-shaped bottom groove extending in the front-rear direction. The U-shaped bottom groove includes a first U-shaped part and a second U-shaped part arranged front and back. On the left and right sides of the first U-shaped part and the second U-shaped part, a plurality of crimping strips are respectively connected. The crimping strips extend in the up-down direction in the initial state. The crimping strip includes an upper bending section and a lower bending section arranged one above the other. One of the front and back sides of the lower bending section is connected to the lower end of the upper bending section and the upper end of the U-shaped bottom groove, and the other can be bent towards the direction close to the wire core. The upper bending section extends in the up-down direction in the initial state. On the opposite sides of the two vertical arms, swing arms capable of swinging in the front-rear direction are respectively arranged. When the swing arms swing, they can squeeze the lower bending section of the crimping strip towards the wire core direction, so that one side of the lower bending section is tightly fitted with the outer surface of the wire core.

[0013] Further, a rotating shaft extending in the up-down direction is rotatably arranged on the vertical arm. The upper end of the rotating shaft is connected to the swing arm. When the rotating shaft rotates, it can drive the swing arm to swing. The lower end of the rotating shaft is connected with a transmission gear. Rack teeth are respectively arranged on the left and right sides of the translation table. The rack teeth are intermittently distributed in the front-rear direction. On the base, there is a linear driving mechanism for driving the translation table to move in the front-rear direction. During the forward movement of the translation table, the rack teeth on both sides of the translation table intermittently drive the transmission gear to rotate. A torsion spring is arranged on the rotating shaft. When the transmission gear is disengaged from the rack teeth, the torsion spring drives the rotating shaft to rotate so that the swing arm returns to its original position.

[0014] Further, a connecting section is provided between the first U-shaped part and the second U-shaped part. The front and rear ends of the connecting section are respectively connected to the first U-shaped part and the second U-shaped part. The height of the first U-shaped part is higher than that of the second U-shaped part to form a step between the first U-shaped part and the second U-shaped part. A pushing plate is fixed behind the translation table on the base. The height of the pushing plate is flush with the height of the translation table. The pushing plate is used for positioning cooperation with the step to position the wire harness terminal placed on the translation table. When the wire harness terminal moves forward relative to the cable, the pushing plate is in pressing cooperation with the step to flatten the step.

[0015] Further, the locking mechanism includes a positioning convex block arranged on the upper side of the translation table. A positioning groove cooperating with the positioning convex block is provided on the lower side of the U-shaped bottom groove of the wire harness terminal. The positioning convex block enters the positioning groove after the wire harness terminal is placed on the translation table.

[0016] The beneficial effects of the present invention are as follows: For a wire harness terminal crimping method and its crimping device of the present invention, before crimping the wire harness terminal onto the core of the cable, a cutting tool is first used to cut a circle along the circumference around the outer insulation of one end of the cable, so that the insulation at one end of the cable is cut off. The cut insulation forms a sheath that can move around the core. Then, after the sheath moves forward towards the front of the cable, a section of the middle core is exposed. Then, the wire harness terminal wire is crimped onto the exposed section of the core. At the same time, the sheath staying at the front end of the core can play a role in tightening the core and prevent the middle core from diverging to the surrounding. In this way, the wire harness terminal can be crimped onto the core more efficiently and tightly.

[0017] Further, during the process of crimping the wire harness terminal of the present invention, the wire harness terminal moves forward relative to the cable, not only pushing the sheath forward and gradually falling off, but also gradually bending and crimping the crimping strip on the wire harness terminal. The entire crimping process is completed synchronously. During the process of the wire harness terminal moving forward relative to the cable, it can straighten the core, improve the crimping effect, and is fast and efficient. Description of the Drawings

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings. Those skilled in the art should understand that these drawings are not necessarily drawn to scale.

[0019] Figure 1 It is a three-dimensional schematic diagram of an embodiment of a wire harness terminal crimping device of the present invention in use;

[0020] Figure 2 for Figure 1 A top view of

[0021] Figure 3 for Figure 2 Left view of

[0022] Figure 4 It is a three-dimensional schematic diagram of an embodiment of a wire harness terminal crimping device of the present invention (the clamping mechanism is not shown);

[0023] Figure 5 It is a three-dimensional schematic diagram of a wiring harness terminal in one embodiment of a wiring harness terminal crimping device of the present invention;

[0024] Figure 6 The present invention is a stereoscopic schematic diagram of a cable in an embodiment of a wiring harness terminal crimping method of the present invention.

[0025] In the figure: 100, cable; 101, wire core; 102, holster; 200, crimping strip; 201, U-shaped bottom groove; 202, lower side bend section; 203, upper bend section; 204, step; 205, first U-shaped part; 206, second U-shaped part; 300, base; 301, clamping mechanism; 302, translation table; 303, transmission gear; 304, swing arm; 305, rotating shaft; 306, rack; 307, push plate; 308, vertical arm; 309, telescopic arm; 400, mounting groove; 401, sliding track; 402, positioning bump. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0027] An embodiment of a wiring harness terminal crimping device of the present invention is as follows Figures 1 to 5 As shown, the wire harness terminal crimping device includes a base 300, on which a translation platform 302 capable of sliding in the front-to-back direction is provided. In this embodiment, a mounting groove 400 is provided on the base 300 below the translation platform 302, and a linear drive mechanism (not shown in the figure) is installed in the mounting groove 400. The linear drive mechanism is connected to the translation platform 302 in a transmission manner to enable the translation platform 302 to slide in the front-to-back direction. In addition, sliding rails 401 are provided on the left and right sides of the mounting groove 400 on the base 300, respectively, and the translation platform 302 is guided and matched with the sliding rails 401 to enable the translation platform 302 to move smoothly on the base 300.

[0028] The upper side of the translation stage 302 has a placement plane. The translation stage 302 is used to place the wire harness terminal and the cable 100. During use, first place the wire harness terminal on the translation stage 302, and then place the cable 100 into the wire harness terminal on the translation stage 302. A clamping mechanism 301 for clamping the cable 100 is provided behind the translation stage 302. After the cable 100 is placed on the translation stage 302, the clamping mechanism 301 clamps and fixes the cable 100 from the rear. A locking mechanism for locking the wire harness terminal is provided on the translation stage 302, so that when the translation stage 302 moves forward, it can drive the wire harness terminal to move forward relative to the cable 100. In this embodiment, the locking mechanism includes a positioning convex block 402 provided on the upper side of the translation stage 302. A positioning groove cooperating with the positioning convex block 402 is provided on the lower side of the wire harness terminal. After the wire harness terminal is placed on the translation stage 302, the positioning convex block 402 enters the positioning groove, thereby realizing that when the translation stage 302 moves forward, it drives the wire harness terminal to move forward together.

[0029] Before further describing the wire harness terminal crimping device of the present invention, the structure of the wire harness terminal crimped at the front end of the cable 100 will be described in detail. In the present invention, the wire harness terminal includes a U-shaped bottom groove 201. The U-shaped bottom groove 201 includes a first U-shaped part 205 and a second U-shaped part 206 arranged one in front of the other. The openings of the first U-shaped part 205 and the second U-shaped part 206 face upward. The cable is for being placed into the first U-shaped part 205 and the second U-shaped part 206. A connecting section is provided between the first U-shaped part 205 and the second U-shaped part 206. The front and rear ends of the connecting section are respectively connected to the first U-shaped part 205 and the second U-shaped part 206. The height of the first U-shaped part 205 is higher than that of the second U-shaped part 206 to form a step 204 between the first U-shaped part 205 and the second U-shaped part 206. A plurality of crimping strips 200 are respectively connected side by side on the left and right sides of the first U-shaped part 205 and the second U-shaped part 206. The crimping strips 200 extend in the up and down direction in the initial state. The crimping strip 200 includes an upper bending section 203 and a lower bending section 202 arranged one above the other. One of the front and rear side edges of the lower bending section 202 is connected to the lower end of the upper bending section 203 and the upper end of the U-shaped bottom groove 201, and the other can be bent towards the direction close to the wire core 101. The upper bending section 203 extends in the up and down direction in the initial state. As Figure 5The wire harness terminal shown, wherein the left and right crimping strips 200 at the foremost end of the first U-shaped portion 205 are in a bent state. The lower bent segments 202 of these two crimping strips 200 are bent inwardly towards the inside of the wire harness terminal, and the upper bent segments 203 are bent inwardly and downwardly towards the inside of the wire harness terminal. The remaining crimping strips 200 on the first U-shaped portion 205 and all the crimping strips 200 on the second U-shaped portion 206 are in an initial state, that is, in a state of extending vertically. Additionally, the positioning groove is provided on the lower side of the U-shaped bottom groove 201 of the wire harness terminal.

[0030] Next, the wire harness terminal crimping device of the present invention will be further described. As Figures 1 to 5 shown, in this embodiment, vertical arms 308 extending in the up and down direction are respectively provided on the left and right sides of the translation stage 302 on the base 300. On the opposite sides of the two vertical arms 308, telescopic arms 309 extending in the left and right direction are respectively provided. The telescopic arms 309 are extended to crimp the wire harness terminal onto the wire core 101 of the cable 100. In this embodiment, by the telescopic movement of the telescopic arms 309 in the left and right direction, the upper bent segments 203 of the respective crimping strips 200 on the wire harness terminal are bent one by one, so that the respective crimping strips 200 are clamped outside the wire core 101 of the cable 100. In this embodiment, swing arms 304 capable of swinging in the front and back direction are respectively provided on the opposite sides of the two vertical arms 308. When the swing arms 304 swing, they can squeeze the lower bent segments 202 of the crimping strips 200 towards the wire core 101 direction, so that one side of the lower bent segment 202 is in tight fit with the outer surface of the wire core 101. It should be noted here that in the present invention, the left and right width of the U-shaped bottom groove 201 of the wire harness terminal in the initial state and the distance between the left and right side crimping strips 200 are greater than the diameter of the cable 100 after removing the insulation layer. By providing the lower bent segment 202 in the present invention, the wire core 101 can be squeezed from the side of the cable 100 towards the middle, and the upper bent segment 203 can be used to clamp it from above the wire core 101, thereby ensuring a closer connection between the wire harness terminal and the wire core 101.

[0031] In this embodiment, the telescopic arm 309 is a telescopic cylinder. One end of the telescopic cylinder is fixed on the vertical arm 308, and the other end extends in a suspended manner towards the middle of the two vertical arms 308. In this embodiment, a rotating shaft 305 extending in the up and down direction is rotatably provided on the vertical arm 308. The upper end of the rotating shaft 305 is connected to the swing arm 304. When the rotating shaft 305 rotates, it can drive the swing arm 304 to swing. The lower end of the rotating shaft 305 is connected with a transmission gear 303. Rack bars 306 are respectively arranged on the left and right sides of the translation stage 302. The rack bars 306 are intermittently distributed in the front and back direction. During the forward movement of the translation stage 302, the rack bars 306 on both sides of the translation stage 302 intermittently drive the transmission gear 303 to rotate. The rotation of the transmission gear 303 drives the swing arm 304 at the upper end of the rotating shaft 305 to rotate, thereby pushing the lower bent section 202 of the crimping strip 200 to bend inwards towards the wire harness terminal. In addition, a torsion spring is provided on the rotating shaft 305. When the transmission gear 303 is disengaged from the rack bar 306, the torsion spring drives the rotating shaft 305 to rotate to reset the swing arm 304, so that the swing arm 304 can press on the lower bent sections 202 of each crimping strip 200 one by one.

[0032] In this embodiment, a pushing plate 307 is fixed behind the translation stage 302 on the base 300. The height of the pushing plate 307 is flush with the height of the translation stage 302. The pushing plate 307 is used for positioning and cooperating with the step 204 to position the wire harness terminal placed on the translation stage 302. That is, after the wire harness terminal is placed on the translation stage 302, the step 204 between the first U-shaped part 205 and the second U-shaped part 206 is positioned and cooperated with the pushing plate 307, thereby positioning the front and back positions of the wire harness terminal. During the crimping process of the wire harness terminal, when the wire harness terminal moves forward relative to the cable 100, the pushing plate 307 is in pressing cooperation with the step 204 and flattens the step 204, so that the bottoms of the first U-shaped part 205 and the second U-shaped part 206 are pulled to the same height.

[0033] An embodiment of the wire harness terminal crimping method of the present invention. This wire harness terminal crimping method is implemented by using the above-mentioned wire harness terminal crimping equipment, as Figures 1 to 6 shown, where the structure of the wire harness terminal crimping equipment is as Figures 1 to 5 shown. This wire harness terminal crimping method includes the following steps:

[0034] a. First, use a cutting tool to cut a circle around the outer periphery of the insulating skin at one end of the cable 100, so that the insulating skin at one end of the cable 100 is cut off. The cut insulating skin forms a leather sleeve 102 that can move around the wire core 101. Set the axis of the cable 100 to extend in the front and back direction. The leather sleeve 102 is located at the front end of the cable 100 and can move forward around the wire core 101.

[0035] b. Move the leather sheath 102 forward by a set distance. At this time, the cable 100 is in the state as Figure 6 shown, that is, a part of the rear end of the leather sheath 102 sleeves outside the wire core 101 to wrap the wire core 101, and there is an exposed wire core 101 between the leather sheath 102 and the uncut insulating skin at the rear.

[0036] c. Press and connect a wire harness terminal outside the exposed wire core 101.

[0037] In this embodiment, before implementing the above step c, first place the wire harness terminal on the translation stage 302 of the wire harness terminal crimping device. The step 204 in the middle of the wire harness terminal is in positioning cooperation with the pushing plate 307 of the wire harness terminal crimping device to limit the front and rear positions of the wire harness terminal, and make the positioning protrusion 402 on the upper side of the translation stage 302 insert into the positioning groove on the lower side of the wire harness terminal. Then place the cable 100 obtained in step b into the wire harness terminal on the translation stage 302. After the wire harness terminal and the cable 100 are placed, as Figure 1 and Figure 2 shown, the clamping mechanism 301 behind the base 300 clamps and fixes the cable 100. At this time, the translation stage 302 is in the initial position, that is, the front end of the translation stage 302 is between the two vertical arms 308 on the left and right.

[0038] In this embodiment, in the above step b, the length of the exposed wire core 101 is less than the length of the wire harness terminal. A part of the wire harness terminal is outside the exposed wire core 101, and the other part is outside the uncut insulating skin at the rear. That is, the first U-shaped part 205 at the front end of the wire harness terminal is outside the exposed wire core 101, and the second U-shaped part 206 at the rear end is outside the uncut insulating skin at the rear. In this embodiment, the front and rear length of the first U-shaped part 205 of the wire harness terminal is the same as the length of the exposed wire core 101 in step b, and the total length of the first U-shaped part 205 and the second U-shaped part 206 is the same as the total length of the wire core 101 exposed after the leather sheath 102 is separated from the wire core 101. That is to say, the length of the leather sheath 102 cut from the cable 100 is the same as the total length of the first U-shaped part 205 and the second U-shaped part 206.

[0039] In this embodiment, step c of the wire harness terminal crimping method further includes: making the translation stage 302 drive the wire harness terminal to move forward relative to the cable 100. During the process of the translation stage 302 driving the wire harness terminal to move forward, the racks 306 on both sides of the translation stage 302 intermittently engage with the transmission gear 303 at the lower end of the rotating shaft 305, thereby driving the swing arm 304 to swing. The swing of the swing arm 304 then presses against the lower bending section 202. Then, the telescopic arm 309 is controlled to expand and contract left and right, thereby pressing against the upper bending section 203. Then, as the translation stage 302 gradually moves forward, the crimping strips 200 of the first U-shaped portion 205 are successively pressed onto the outer side of the wire core 101 through the swing arm 304 and the telescopic arm 309. At the same time, the front end of the wire harness terminal is in a blocking fit with the rear end of the sheath 102. Since only a part of the crimping strips 200 of the wire harness terminal are crimped to the wire core 101 at this time, when the translation stage 302 moves forward, it can still drive the wire harness terminal to move forward relative to the wire core 101. The forward movement of the wire harness terminal then pushes the sheath 102 to move relative to the cable 100, causing the sheath 102 to fall off from the front end of the wire core 101. When the sheath 102 is detached from the wire core 101, the first U-shaped portion 205 and the second U-shaped portion 206 of the wire harness terminal are exactly all located outside the wire core 101. At this time, all the crimping strips 200 on the first U-shaped portion 205 of the wire harness terminal are bent, and the front end of the second U-shaped portion 206 is just between the left and right vertical arms 308, and the crimping strips 200 on the second U-shaped portion 206 have not been bent yet.

[0040] During the process of each of the crimping strips 200 on the first U-shaped portion 205 being successively bent, the swing arm 304 first bends one side of the lower bending section 202 of the crimping strip 200 towards the direction of the wire core 101, and then the telescopic arm 309 is started to extend to bend the upper end of the upper bending section 203 downward, so that the crimping strip 200 is wrapped around the outside of the wire core 101. And during the process of the wire harness terminal moving forward relative to the cable 100, the step 204 between the first U-shaped portion 205 and the second U-shaped portion 206 is flattened by the pushing plate 307, so that the first U-shaped portion 205 and the second U-shaped portion 206 are at the same height.

[0041] Then, the clamping mechanism 301 is controlled to release the rear cable 100. At this time, the clamping mechanism 301 only plays a supporting role for the cable 100. Then, the translation stage 302 moves forward again and drives the wire harness terminal and the cable 100 to move forward synchronously. During the process of the translation stage 302 moving forward, the telescopic arm 309 expands and contracts left and right and the swing arm 304 swings to successively bend the crimping strips 200 on the second U-shaped portion 206, thereby crimping the entire wire harness terminal onto the outside of the wire core 101.

[0042] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A wire harness terminal crimping method, characterized in that: The following steps are involved: a. First, use a cutting tool to cut a circle along the circumference of the outer periphery of the insulating skin at one end of the cable, so that the insulating skin at one end of the cable is cut off, and the cut insulating skin forms a leather sheath (102) that can move around the outer periphery of the wire core (101), and the axis of the cable is set to extend in the front-to-back direction, and the leather sheath (102) is located at the front end of the cable and can move forward around the outer periphery of the wire core (101); b. Move the leather sheath (102) forward by a set distance, and a part of the rear end of the leather sheath (102) is sheathed outside the wire core (101) to wrap the wire core (101), and there is a bare wire between the leather sheath (102) and the uncut insulating skin at the rear. core (101); c. crimping a wiring harness terminal outside the exposed wire core (101); in the above step b, the length of the exposed wire core (101) is less than the length of the wiring harness terminal, a portion of the wiring harness terminal is located outside the exposed wire core (101), and another portion is located outside the uncut insulation skin at the rear; in step c, when crimping the wiring harness terminal, the wiring harness terminal is moved forward relative to the cable, and the front end of the wiring harness terminal pushes the leather cover (102) forward, and when the leather cover (102) is detached from the wire core (101), the wiring harness terminal is completely located outside the wire core (101), and the entire wiring harness terminal is crimped to the outside of the wire core (101).

2. The wire harness terminal crimping method according to claim 1, characterized in that: The wiring harness terminal comprises a U-shaped bottom groove (201), wherein the U-shaped bottom groove (201) comprises a first U-shaped portion (205) and a second U-shaped portion (206) arranged one in front of the other, the openings of the first U-shaped portion (205) and the second U-shaped portion (206) face upward, the cable (100) is used to be placed in the first U-shaped portion (205) and the second U-shaped portion (206), and the left and right sides of the first U-shaped portion (205) and the second U-shaped portion (206) are respectively connected to a plurality of crimping strips (200), the front-to-back length of the first U-shaped portion (205) is the same as the length of the exposed wire core (101) in step b, and the total length of the first U-shaped portion (205) and the second U-shaped portion (206) is the same as the total length of the wire core (101) exposed after the leather cover (102) is separated from the wire core (101).

3. The wire harness terminal crimping method according to claim 2, characterized in that: The crimping strip (200) extends in the up-down direction in the initial state. The crimping strip (200) comprises an upper bending section (203) and a lower bending section (202) which are arranged in sequence from top to bottom. One of the front and rear side edges of the lower bending section (202) is connected to the lower end of the upper bending section (203) and the upper end of the U-shaped bottom groove (201), and the other side can be bent in a direction close to the wire core (101). The upper bending section (203) extends in the up-down direction in the initial state. In the process of crimping the wiring harness terminal in step c, one side of the lower bending section (202) of a crimping strip (200) is first bent toward the wire core (101), and then the upper end of the upper bending section (203) is bent downward, so that the crimping strip (200) is wrapped around the outside of the wire core (101).

4. The wire harness terminal crimping method according to claim 3, characterized in that: A connecting section is provided between the first U-shaped portion (205) and the second U-shaped portion (206), and the front and rear ends of the connecting section are respectively connected to the first U-shaped portion (205) and the second U-shaped portion (206); the height of the first U-shaped portion (205) is higher than that of the second U-shaped portion (206), so as to form a step (204) between the first U-shaped portion (205) and the second U-shaped portion (206); in step c, when the wiring harness terminal moves forward relative to the cable, the step (204) between the first U-shaped portion (205) and the second U-shaped portion (206) is flattened, so that the first U-shaped portion (205) and the second U-shaped portion (206) are at the same height.

5. A wire harness terminal crimping device for implementing the wire harness terminal crimping method according to any one of claims 1 to 4, comprising a base (300), characterized in that: The base (300) is provided with a translation platform (302) capable of sliding in a front-to-rear direction, the translation platform (302) being used to place wiring harness terminals and cables, a clamping mechanism (301) for clamping cables is provided at the rear of the translation platform (302), and a locking mechanism for locking the wiring harness terminals is provided on the translation platform (302), so that the translation platform (302) can drive the wiring harness terminals to move forward relative to the cables when moving forward, and the base (300) is provided with a locking mechanism for locking the wiring harness terminals when moving forward. The left and right sides of the platform (302) are respectively provided with vertical arms (308) extending in the up-down direction, and the opposite sides of the two vertical arms (308) are respectively provided with telescopic arms (309) extending in the left-right direction, and the telescopic arms (309) are extended to crimp the wiring harness terminal onto the wire core (101) of the cable; the wiring harness terminal comprises a U-shaped bottom groove (201) extending in the front-back direction, and the U-shaped bottom groove (201) comprises a first U-shaped part (205) and a second U-shaped part (206) arranged one in front of the other. The first U-shaped portion (205) and the second U-shaped portion (206) are respectively connected to a plurality of crimping strips (200) on the left and right sides thereof. The crimping strips (200) extend in the up-down direction in the initial state. The crimping strips (200) include an upper bending section (203) and a lower side bending section (202) which are sequentially arranged up and down. One of the front and rear side edges of the lower side bending section (202) is connected to the lower end of the upper bending section (203) and the upper end of the U-shaped bottom groove (201). The other can be bent in a direction close to the wire core (101), and the upper bent section (203) extends in the up-down direction in the initial state; and swing arms (304) that can swing in the front-back direction are respectively provided on opposite sides of the two vertical arms (308), and the swing arms (304) can press the lower bent section (202) of the crimping strip (200) in the direction of the wire core (101) when swinging, so that one side of the lower bent section (202) is pressed tightly against the outer surface of the wire core (101).

6. The wire harness terminal crimping device according to claim 5, characterized in that: The vertical arm (308) is rotatably provided with a rotating shaft (305) extending in the up-down direction, the upper end of the rotating shaft (305) is connected to the swing arm (304), and when the rotating shaft (305) rotates, it can drive the swing arm (304) to swing, and the lower end of the rotating shaft (305) is connected to a transmission gear (303), and racks (306) are respectively provided on the left and right sides of the translation platform (302), and the racks (306) are intermittently distributed in the front-back direction. The base A linear drive mechanism for driving the translation platform (302) to move in the front-rear direction is provided on (300). When the translation platform (302) moves forward, the racks (306) on both sides of the translation platform (302) intermittently drive the transmission gear (303) to rotate. A torsion spring is provided on the rotating shaft (305). When the transmission gear (303) is disengaged from the rack (306), the torsion spring drives the rotating shaft (305) to rotate so as to reset the swing arm (304).

7. The wire harness terminal crimping device according to claim 6, characterized in that: A connecting section is provided between the first U-shaped portion (205) and the second U-shaped portion (206), and the front and rear ends of the connecting section are respectively connected to the first U-shaped portion (205) and the second U-shaped portion (206); the height of the first U-shaped portion (205) is higher than that of the second U-shaped portion (206), so as to form a step (204) between the first U-shaped portion (205) and the second U-shaped portion (206); a push plate (307) is fixed to the base (300) behind the translation platform (302); the height of the push plate (307) is flush with the height of the translation platform (302); the push plate (307) is used to position and cooperate with the step (204) to position the wiring harness terminal placed on the translation platform (302); when the wiring harness terminal moves forward relative to the cable, the push plate (307) is pressed and cooperated with the step (204) to flatten the step (204).

8. The wire harness terminal crimping device according to claim 7, characterized in that: The locking mechanism comprises a positioning protrusion (402) arranged on the upper side of the translation platform (302), and a positioning groove cooperating with the positioning protrusion (402) is provided on the lower side of the U-shaped bottom groove (201) of the wiring harness terminal, and the positioning protrusion (402) enters the positioning groove after the wiring harness terminal is placed on the translation platform (302).

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