A wire harness injection mold and its manufacturing process

Abstract

This invention discloses a wire harness injection mold, comprising an upper mold, a lower mold, and a limiting component. The upper and lower molds interlock to form an injection cavity for accommodating wires. The injection cavity has an outlet port for the wire end to pass through and to prevent the injection material from flowing out. The limiting component includes one or more of the following: a retaining pin, a pad, and a wire pulling device. The retaining pin is fixedly disposed in the lower mold, with its end located inside the injection cavity, to limit lateral displacement of the wire. The pad protrudes from the bottom surface of the injection cavity to support the wire. The wire pulling device is relatively fixed to the lower mold to fix the two ends of the wire passing through the outlet port and to straighten the wire. Based on this, the invention also discloses a wire harness injection molding production process using the above-mentioned wire harness injection mold. When used to produce wire harness products, this invention can keep the wires centered, producing wire harnesses with uniform protective outer layer coverage and less exposed wires, resulting in better wire harness product quality.

Description

Technical Field

[0001] This invention relates to the field of wire harness manufacturing technology, and in particular to a wire harness injection mold and a wire harness injection molding production process. Background Technology

[0002] Wiring harnesses are the main network of automotive circuits, connecting the electronic and electrical components of the vehicle. Existing wiring harnesses basically consist of conductors and a protective outer layer covering the conductors. For some wiring harnesses, the protective outer layer can be formed by curing injection molding materials such as polyurethane foam. In production, this process is typically carried out using injection molds. Using injection molds allows for rapid covering of the conductors to form the protective outer layer.

[0003] However, during production, because the liquid injection molding material takes time to cure, before the injection molding material cures, the wires are prone to lateral displacement or bending and sinking due to gravity in the injection molding cavity, making it impossible to maintain a centered state. This results in quality problems such as uneven protective outer layer coverage and large areas of exposed wires in the produced wire harness. Summary of the Invention

[0004] The purpose of this invention is to provide a wire harness injection mold and a wire harness injection molding process, which aims to improve the problem of wire misalignment during wire harness injection molding.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A wire harness injection mold is used to produce wire harnesses, the wire harnesses including conductors and a protective outer layer formed by injection molding of injection molding material on the outside of the conductors. The wire harness injection mold includes an upper mold, a lower mold, and a limiting assembly. The upper mold and the lower mold are interlocked to form an injection cavity for accommodating the conductors. The injection cavity has an outlet port for the end of the conductor to pass through and to prevent the injection molding material from flowing out. The limiting assembly includes one or more of the following: a retaining pin, a pad, and a wire pulling device. The retaining pin is fixedly disposed in the lower mold, and its end is located inside the injection cavity to limit the lateral displacement of the conductor. The pad protrudes from the bottom end face of the injection cavity to support the conductor. The wire pulling device is relatively fixed to the lower mold to fix the two ends of the conductor passing through the outlet port and to straighten the conductor.

[0007] Furthermore, the injection molding cavity is formed by the intersection of multiple cavity branches, and the chuck is located at the intersection of the cavity branches, separating the wires in any two adjacent cavity branches.

[0008] Furthermore, the chuck pins are located at the bend of the injection molding cavity, and several are spaced apart along the bend path of the injection molding cavity.

[0009] Furthermore, the lower mold includes a lower mold core and a lower mold plate. The injection cavity is opened at the top of the lower mold core and connected to the lower mold plate at the bottom. An installation through hole is opened on the lower mold core to pass through the injection cavity. One end of the chuck passes through the installation through hole into the injection cavity, and the other end is limited and fixed between the lower mold core and the lower mold plate.

[0010] Furthermore, the pad is located directly below the wire and is arc-shaped overall. The top surface of the pad is an arc surface whose axial direction is consistent with the axis of the injection molding cavity. The end of the chuck protrudes from the top surface of the pad and is positioned opposite each other on both sides of the wire.

[0011] Furthermore, the wire pulling device includes a fixed seat, a movable seat, a spring, and a linear limiting rod; the fixed seat is fixed relative to the lower mold; the movable seat is located between the fixed seat and the wire outlet port to fix the end of the wire; the limiting rod moves movably through the fixed seat and can move horizontally along its own length direction, one end of the limiting rod is limited to the side of the fixed seat away from the wire outlet port, and the other end is fixedly connected to the movable seat, the length direction of the limiting rod is consistent with the wire outlet direction of the wire end; the spring is sleeved on the outside of the limiting rod and located on the side of the fixed seat away from the wire outlet port, the spring is in a compressed state, and its two ends respectively abut against the end of the limiting rod and the fixed seat.

[0012] Furthermore, the top of the movable base has a U-shaped wire-holding opening for holding wires.

[0013] Furthermore, the bottom of the upper mold and the top of the lower mold are provided with a flow-stopping groove. The flow-stopping groove is located at the outlet port and is embedded with a silicone block. The silicone block in the upper mold and the silicone block in the lower mold press the wire tightly together and cut off the outlet port.

[0014] Furthermore, the inner surface of the injection molding cavity is provided with spiral-shaped ridges, which are arranged radially along the injection molding cavity; the diameter of the injection molding cavity is defined as d, the pitch of the ridges is defined as P, and the relationship between the pitch of the ridges and the diameter of the injection molding cavity is: P=C*d; where C is a constant, and 0.60≤C≤0.65.

[0015] A wire harness injection molding process, using the wire harness injection mold described above, includes the following specific steps:

[0016] S1. Spray the release agent evenly into the injection cavity and blow it dry;

[0017] S2. Insert the wire into the injection molding cavity and limit it using the limiting component;

[0018] S3. The upper mold and the lower mold are fastened together to close the injection cavity, and the injection material is injected into the injection cavity, wherein the injection material is a foam material;

[0019] S4. After the injection molding material has been foamed and cured, the wire harness is removed and the burrs on the wire harness are removed.

[0020] The present invention has the following beneficial effects:

[0021] 1. The injection cavity of the wire harness injection mold is equipped with an adjustable limiting component that restricts the position of the wire. The limiting component includes one or more combinations of a retaining pin, a pad, and a wire pulling device. When the mold is equipped with a retaining pin, it can prevent the wire from shifting laterally, so that the wire approaches the axis of the injection cavity in the lateral direction. When the mold is equipped with a pad, it can support the wire, so that the wire approaches the axis of the injection cavity in the longitudinal direction. When the wire pulling device is equipped, it can straighten the wire and prevent the wire from bending and sinking, so that the wire approaches the axis of the injection cavity in both the lateral and longitudinal directions. It can be seen that any of the above limiting components can keep the wire in a centered state before the injection material solidifies.

[0022] 2. The wire harness injection molding production process uses the above-mentioned wire harness injection mold. During production, the wires are more likely to be kept in a centered position. The resulting wire harness products have a uniform protective outer layer, less exposed wires, and better quality. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the wire harness injection mold of the present invention.

[0024] Figure 2 This is a schematic diagram of the three-dimensional structure of the upper mold of the present invention.

[0025] Figure 3 This is a schematic diagram of the bottom structure of the upper mold of the present invention.

[0026] Figure 4 for Figure 3 A magnified view of part A in the diagram.

[0027] Figure 5 This is a schematic diagram of the three-dimensional structure of the lower mold of the present invention.

[0028] Figure 6 This is a schematic diagram of the top structure of the lower mold of the present invention.

[0029] Figure 7 This is one of the schematic diagrams showing the structure of the pad and the chuck.

[0030] Figure 8 This is one of the schematic diagrams showing the structure of the pad and the chuck.

[0031] Figure 9 This is a schematic diagram of the structure at the intersection of the cavity branches of the present invention.

[0032] Figure 10This is a schematic diagram of the structure at the bend of the cavity branch of the present invention.

[0033] Figure 11 This is a schematic diagram of the wire pulling device of the present invention.

[0034] Figure 12 This is a diagram showing the usage state of the wire pulling device of the present invention.

[0035] Figure 13 This is a schematic diagram of the wire harness structure produced by the present invention.

[0036] Explanation of main component symbols: 1. Upper mold; 2. Lower mold; 3. Lower template; 4. Lower mold core; 5. Mounting through hole; 6. Injection cavity; 7. Outlet port; 8. Cavity branch; 9. Pin; 10. Pad; 11. Wire pulling device; 12. Fixed seat; 13. Moving seat; 14. Wire clamping port; 15. Spring; 16. Limiting rod; 17. Flow stop groove; 18. Embossing; 19. Wire harness; 20. Wire; 21. Protective outer layer; 22. Spiral groove; 23. Folded groove; H, Height of pad protruding from the bottom end face of the injection cavity; W, Thickness of protective outer layer. Detailed Implementation

[0037] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0038] Example 1

[0039] like Figure 1-13 As shown, this invention discloses an injection mold for producing a wire harness 19. The wire harness 19 includes a conductor 20 and a protective outer layer 21 formed by injection molding of an injection molding material on the outside of the conductor 20. The injection mold for the wire harness 19 includes an upper mold 1, a lower mold 2, and a limiting assembly. The upper mold 1 and the lower mold 2 are interlocked and enclosed to form an injection cavity 6 for accommodating the conductor 20. Therefore, only a portion of the injection cavity 6 is shown in the figures. The injection cavity 6 is provided with an outlet port 7 for the end of the conductor 20 to pass through and for preventing the injection molding material from flowing out.

[0040] The limiting component includes one or more of the following: pin 9, pad 10, and pull wire device 11. The specific combination is set according to the actual correction requirements. For example, only pin 9, only pad 10, or only pull wire device 11 can be set. Alternatively, a combination of pin 9 and pad 10, or a combination of pad 10 and pull wire device 11 can be set, etc.

[0041] The retaining pin 9 is fixedly disposed within the lower mold 2, with its end located inside the injection cavity 6, to limit the lateral displacement of the wire 20. When the retaining pin 9 is disposed within the lower mold 2, it facilitates alignment adjustment before mold closing. If the retaining pin 9 were disposed within the upper mold 1, it would be more difficult for production personnel to observe its position and accurately limit its movement. The retaining pin 9 is fixed to the lower mold 2, so when the wire harness 19 is removed, the retaining pin 9 can detach from the protective outer layer 21. Preferably, the retaining pin 9 is vertically disposed within the lower mold 2.

[0042] The pad 10 protrudes from the bottom surface of the injection molding cavity 6 to support the wire 20. A certain distance should be maintained between the top surface of the pad 10 and the axis of the injection molding cavity 6. The height H of the pad 10 protruding from the bottom surface of the injection molding cavity 6 is adjusted according to the thickness W of the protective outer layer 21. For example, when the thickness W of the protective outer layer 21 is approximately 2.5 mm, the height H of the pad 10 protruding from the bottom surface of the injection molding cavity 6 can be approximately 0.5 mm. Depending on the length of the wire 20, multiple pads 10 can be spaced along the axis of the injection molding cavity 6. Corresponding to the pads 10, the manufactured wire harness 19 has a zigzag groove 23. Appropriately setting the zigzag groove 23 allows the wire harness 19 to have bending capabilities, facilitating its use.

[0043] The wire pulling device 11 is fixed relative to the lower mold 2 and is used to fix the two ends of the wire 20 passing through the outlet port 7 and straighten the wire 20. In the wire harness 19, some wires 20 are laid in a straight line, and some wires 20 are laid in a bent line to form a branch. The wire pulling device 11 is preferably used when the wires 20 are laid in a straight line. By fixing the two ends of the wires 20 passing through the injection molding cavity 6 by the wire pulling device 11, the wires 20 can be tightened and kept in a straight state. At the same time, the position of the wire pulling device 11 fixing the wires 20 should be aligned with the position of the axis of the injection molding cavity 6 to ensure that the wires 20 are centered. By straightening the wires 20 by the wire pulling device 11, not only can the wires 20 be kept in a centered state, but it will not affect the injection molding of the protective outer layer 21 and will not leave marks on the protective outer layer 21.

[0044] As mentioned above, the wire harness 19 often has forks. Correspondingly, the injection molding cavity 6 is formed by the intersection of multiple cavity branches 8. The wires 20 placed in the injection molding cavity 6 are prone to deviating from the center of the injection molding cavity 6 at the fork position due to bending, and the probability of the protective outer layer 21 being exposed is higher. To address this, a retaining pin 9 can be placed at the intersection of the cavity branches 8, separating the wires 20 in any two adjacent cavity branches 8. The retaining pin 9 is preferably placed close to the axis of the injection molding cavity 6, which can effectively solve the problem of the wires 20 deviating from the axis of the injection molding cavity 6 at the fork and failing to be centered, thus improving the phenomenon of exposed wires 20 at the fork position of the finished wire harness 19.

[0045] Except for the fork points of wire harness 19, some individual segments of wire harness 19 have bent sections. That is, except for the intersection points of cavity branch paths 8, some cavity branch paths 8 are bent. Similar to the intersection points, these bends can easily lead to the wires 20 shifting or becoming exposed. Therefore, locking pins 9 can be placed at the bend points of the injection molding cavity 6. To ensure the limiting effect, several locking pins 9 can be placed at intervals along the bend path of the injection molding cavity 6, and preferably on the side where the wires 20 are prone to shifting and becoming exposed.

[0046] The pin 9 can be directly fixed in the lower mold 2, or even integrally formed with the lower mold 2. When the pin 9 is integrally formed with the lower mold 2, the protective outer layer 21 after injection molding is more aesthetically pleasing. The pin 9 can also be detachably assembled and connected to the lower mold 2. This setting facilitates the replacement of pins 9 of different lengths according to the number of wires 20 and the thickness W of the protective outer layer 21, and adjusts the length of the pin 9 inserted into the injection cavity 6. For example, in this invention, the pin 9 adopts a detachable design. The lower mold 2 includes a lower mold core 4 and a lower mold plate 3. The lower mold core 4 has an injection cavity 6 at the top and is connected to the lower mold plate 3 at the bottom. The lower mold core 4 has a through hole 5 that passes through the injection cavity 6. The cross-section of the pin 9 is circular. Correspondingly, the through hole 5 is a circular through hole, and the diameter of the hole is adapted to the outer diameter of the pin 9. One end of the pin 9 passes through the through hole 5 into the injection cavity 6, and the other end is limited and fixed between the lower mold core 4 and the lower mold plate 3.

[0047] The pad 10 is located directly below the wire 20 and is arc-shaped. The axis of the pad 10 matches the axis of the injection cavity 6, facilitating multi-directional support and lifting of the wire 20. Multiple pads 10 can be spaced along the axis of the injection cavity 6, allowing multiple pads 10 to support the wire 20 at multiple points, keeping the wire 20 centered within the injection cavity 6. The top surface of the pad 10 is an arc-shaped surface with its axis aligned with the axis of the injection cavity 6, which makes the corresponding zigzag groove 23 formed on the wire harness 19 arc-shaped, allowing the wire harness 19 to bend more flexibly. When the pad 10 is used in conjunction with the pins 9, the ends of some pins 9 can protrude from the top surface of the pad 10 and be positioned opposite each other on both sides of the wire 20, while limiting the lateral displacement of the wire 20.

[0048] The wire pulling device 11 is preferably fixedly mounted on the lower mold 2 to facilitate straightening of the wire 20 before mold closing. The wire pulling device 11 can be a clamping component fixed to the lower mold 2, allowing production personnel to clamp the end of the wire 20 and manually adjust its position on the wire 20 before mold closing, thereby adjusting the degree of straightening and tightening. Or, as... Figure 11 , 12As shown, the device includes a fixed base 12, a movable base 13, a spring 15, and a linear limiting rod 16. The fixed base 12 is fixed relative to the lower mold 2. The movable base 13 is located between the fixed base 12 and the outlet port 7, used to fix the end of the wire 20. The limiting rod 16 moves movably through the fixed base 12 and can move horizontally along its length. One end of the limiting rod 16 is limited to the side of the fixed base 12 away from the outlet port 7, and the other end is fixedly connected to the movable base 13. The length direction of the limiting rod 16 is consistent with the outlet direction of the wire 20. The spring 15 is sleeved on the outside of the limiting rod 16 and located on the side of the fixed base 12 away from the outlet port 7. The spring 15 is in a compressed state, and its two ends respectively abut against the ends of the limiting rod 16 and the fixed base 12.

[0049] Through the extension and retraction of the spring 15 and the movement and limiting action of the limiting rod 16, the movable seat 13 can be moved closer to or away from the outlet port 7, thereby straightening the wire 20 and controlling the degree of tension. Alternatively, the fixed seat 12 can be fixedly mounted on the top of the lower template 3, making it convenient to fix the wire 20. Furthermore, a U-shaped wire-holding slot 14 can be provided on the top of the movable seat 13 to hold the wire 20. When the end of the wire 20 is equipped with a terminal block or other components, the size difference between the terminal block or other components and the wire 20 can be used to limit the end of the wire 20 between the movable seat 13 and the fixed seat 12, making it convenient and quick to fix the wire 20.

[0050] In this mold, the outlet port 7 for the wire 20 should be sealed to prevent the injection material in the injection cavity 6 from flowing out. To this end, a flow-stopping groove 17 is formed at the bottom of the upper mold 1 and the top of the lower mold 2, respectively. The flow-stopping groove 17 is located at the outlet port 7 and contains a silicone block. The silicone blocks in the upper mold 1 and the lower mold 2 press the wire 20 together, cutting off the outlet port 7. To ensure the flow-stopping effect, the depth of the flow-stopping groove 17 should be greater than the radius of the injection cavity 6 at the outlet port 7. By pressing the silicone block embedded in the flow-stopping groove 17 together, the outlet port 7 can be sealed tightly without affecting the exit of the wire 20.

[0051] In addition, the inner surface of the injection molding cavity 6 is provided with spiral-shaped ridges 18. The ridges 18 are arranged radially along the injection molding cavity 6. Corresponding to the ridges 18, the outer protective layer 21 of the produced wire harness 19 is formed with spiral grooves 22, which enables the wire harness 19 to bend. The pitch of the ridges 18 is adjusted according to the diameter of the injection molding cavity 6. If the pitch is too large, the formed wire harness 19 will be too stiff and difficult to bend, which is not conducive to use. If the pitch is too small, the ridges 18 will be too dense, which is not conducive to the forming of the outer protective layer 21. Let the diameter of the injection molding cavity 6 be d, and the pitch of the ridges 18 be P. In order to enable the produced wire harness 19 to have good bending ability without affecting the forming of the outer protective layer 21, the preferred relationship between the pitch of the ridges 18 and the diameter of the injection molding cavity 6 is: P = C * d, where C is a constant, and 0.60 ≤ C ≤ 0.65. Furthermore, when the constant C is set to 0.625, the quality of the produced wire harness 19 is better.

[0052] As can be seen, the mold can be equipped with multiple limiting measures. During injection molding production, the limiting components can correct the wire 20 in the horizontal and vertical directions, prevent the wire 20 from sinking and shifting, and make the wire 20 approach the axis of the injection cavity 6. It can maintain a centered state before the injection material is cured, and finally produce a wire harness 19 product with better quality.

[0053] Example 2

[0054] Based on the above-described embodiment one, this invention also discloses a wire harness 19 injection molding production process. This process uses the aforementioned wire harness 19 injection mold. Before production, it is best to retrieve the processing parameters of each piece of equipment through a preset program and start the machine to produce a trial piece to ensure the processing parameters are correct. The specific steps of this wire harness 19 injection molding production process are as follows:

[0055] S1. Evenly spray the release agent into the injection cavity 6 and blow it dry. During spraying, avoid uneven application and missed areas to prevent affecting the demolding of the finished wire harness 19. After spraying, use an air gun to dry the release agent, allowing it to form a thin film inside the injection cavity 6. This prevents undried release agent droplets from affecting the molding of the protective outer layer 21, leaving pits on the finished wire harness 19, and resulting in poor appearance.

[0056] S2. Place the wire 20 into the injection cavity 6 and limit it through the limiting component to ensure that the wire 20 is in a centered state.

[0057] S3. The upper mold 1 and lower mold 2 are engaged to close the injection cavity 6, i.e., mold closing. Mold closing can be completed automatically by a mold closing machine. After mold closing, the injection material is injected into the injection cavity 6 through the injection port on the mold. In this process, the injection material is a foamed material such as polyurethane, and the wire harness 19 produced after injection molding is a foamed wire harness 19.

[0058] S4. After injecting the injection material, seal the injection port and wait for the injection material to foam and cure. After the injection material cures, it will cover the outside of the wire 20 to form a protective outer layer 21. Then the wire harness 19 can be demolded and the burrs on the wire harness 19 can be removed to obtain the finished wire harness 19.

[0059] The process uses the aforementioned wire harness 19 injection mold for production. Before the injection material is cured, the wire 20 is more likely to remain centered. The resulting wire harness 19 product has a uniform protective outer layer 21, with less exposed wire 20, resulting in better quality.

[0060] Although the invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail to the invention without departing from the spirit and scope of the invention as defined in the appended claims are within the scope of protection of the invention.

Claims

1. A wire harness injection mold for producing a wire harness, the wire harness comprising a wire and a protective outer layer formed by injection of an injection material outside the wire, characterized in that: comprising an upper mold, a lower mold and a limiting assembly; the upper mold and the lower mold are mutually buckled and form an injection cavity accommodating the wire, the injection cavity is provided with a wire outlet port for the wire end to pass through and block the injection material from flowing out; the limiting assembly comprises a clamping pin and a pad; the clamping pin is fixedly arranged in the lower mold, the end of the clamping pin is located inside the injection cavity, and is used to limit the lateral deviation of the wire; the injection cavity is formed by the intersection of multiple cavity branches, the clamping pin is located at the intersection of the cavity branches, and separates the wires in any two adjacent cavity branches; the clamping pin is located at the bending position of the injection cavity and is arranged at intervals along the bending path of the injection cavity; the pad is protrudingly arranged at the bottom end surface of the injection cavity and is used to support the wire. It also comprises a wire pulling device, which is relatively fixed to the lower mold, and is used to fix the two ends of the wire passing through the wire outlet port and straighten the wire.

2. A wiring harness injection mold as in claim 1, wherein:

3. The wire harness injection mold of claim 1, characterized in that: the lower mold comprises a lower mold core and a lower mold plate, the lower mold core is provided with the injection cavity at the top, and is connected with the lower mold plate at the bottom, and the lower mold core is provided with a mounting through hole penetrating through the injection cavity; one end of the clamping pin penetrates into the injection cavity through the mounting through hole, and the other end is limited and fixed between the lower mold core and the lower mold plate.

4. The wire harness injection mold of claim 1, characterized in that: the pad is located directly below the wire and has a whole circular arc shape, and the top surface of the pad is a circular arc surface with the same axial direction as the axial direction of the injection cavity; the end of the clamping pin passes through the top surface of the pad and is relatively arranged on both sides of the wire.

5. The wire harness injection mold of claim 2, characterized in that: the wire pulling device comprises a fixed seat, a moving seat, a spring and a straight limiting rod; the fixed seat is relatively fixed with the lower mold; the moving seat is located between the fixed seat and the wire outlet port to fix the end of the wire; the limiting rod movably passes through the fixed seat and can move horizontally along the length direction of the limiting rod, one end of the two ends of the limiting rod is limited on the side of the fixed seat away from the wire outlet port, and the other end is fixedly connected with the moving seat, and the length direction of the limiting rod is consistent with the wire outlet direction of the end of the wire; the spring is sleeved outside the limiting rod and is located on the side of the fixed seat away from the wire outlet port, the spring is in a compressed state, and the two ends of the spring abut against the end of the limiting rod and the fixed seat respectively.

6. The wire harness injection mold of claim 5, characterized in that: the moving seat is provided with a U-shaped wire clamping port at the top to clamp the wire.

7. The wire harness injection mold of claim 1, characterized in that: the bottom of the upper mold and the top of the lower mold are relatively provided with a flow stopping groove, the flow stopping groove is located at the wire outlet port, and a silica gel block is embedded in the flow stopping groove, and the silica gel block in the upper mold and the silica gel block in the lower mold press the wire upward and downward, and cut off the wire outlet port.

8. The wire harness injection mold of claim 1, characterized in that: ​ The inner side of the injection cavity is provided with a spiral convex pattern, and the convex pattern is arranged along the radial direction of the injection cavity; The diameter of the injection cavity is defined as d, the pitch of the convex pattern is P, and the relationship between the pitch of the convex pattern and the diameter of the injection cavity is P=C*d. In the formula, C is a constant, and 0.60≤C≤0.

65.

9. A harness injection molding production process characterized by: The specific steps are as follows using the wire harness injection mold according to any one of claims 1-8: S1. Uniformly spray the release agent inside the injection cavity, and blow dry the release agent; S2. Place the wire into the injection cavity and limit it through the limiting assembly; S3. Close the injection cavity by buckling the upper mold and the lower mold, and inject the injection material into the injection cavity, wherein the injection material is a foaming material; S4. After the foaming and solidification of the injection material, take out the wire harness and remove the burrs on the wire harness.

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