Crimping die for copper pipe terminal with convex rib

Abstract

The invention discloses a copper pipe terminal crimping die with a convex rib, which comprises an upper die and a lower die which are oppositely arranged, sliding grooves are formed in the upper die and the lower die, movable pressing blocks are elastically arranged in the sliding grooves, fixed pressing blocks are further arranged on the upper die and the lower die, a first forming surface is formed on each fixed pressing block, and each first forming surface comprises an abutting part and a pushing part which form an included angle; the two movable pressing blocks and the two fixed pressing blocks are sequentially enclosed to define a pressing opening, and a convex rib is arranged on the abutting portion of the fixed pressing block of the upper die and extends in the axial direction of the pressing opening. According to the invention, the terminal is crimped through the convex ribs, and the convex ribs can equally divide the copper core wire in the terminal to two sides in a line-surface contact manner, so that the copper core wire can be ensured to be subjected to relatively uniform extrusion deformation. Compared with the prior art, the terminal is crimped through the axially extending convex ribs, so that the technical problem that the terminal cannot be uniformly crimped through the convex points is solved.

Description

Technical Field

[0001] The invention relates to the technical field of wire harness terminals, in particular to a crimping die for a copper tube terminal with a convex rib. Background Art

[0002] In recent years, the wiring harness industry in my country has reached a significant level of development. Wiring harness products are not only specialized products for the automotive and home appliance industries, but also require large-scale, specialized production in fields such as electronics, instrumentation, and electromechanical equipment. In the pantograph industry, the importance of wiring harness terminals is self-evident. A pantograph is an electrical device that draws power from the catenary for electric locomotives or EMUs. It conducts current from the contact wire into the locomotive's interior to supply the traction motor. In this process, wiring harness terminals play a crucial role as key components connecting the pantograph to the locomotive's internal circuitry.

[0003] Wire harness terminals are usually crimped to achieve connection, and the crimping quality affects the working condition of the shunt wire. The crimping tightness is an important indicator of crimping quality: If the wiring harness terminals are not crimped tightly, the crimping resistance will be too large. During use, high temperature will be generated here, and the crimping resistance will gradually increase, causing the cable to melt here, affecting the normal operation of the vehicle; if the wiring harness terminals are crimped too tightly, the cable cross-sectional area will be seriously reduced, the crimping resistance will also be too large, and the current carrying capacity of the shunt wire will also be reduced.

[0004] Figure 1 The present invention shows a conventional wire harness terminal crimping die, comprising an upper die and a lower die, both of which are provided with crimping grooves. The crimping groove of the upper die has a protrusion. During crimping, the protrusion first contacts and squeezes the terminal. This can easily lead to situations where the extrusion force at the protrusion is appropriate, but other areas are insufficiently squeezed, while other areas are sufficiently squeezed, and the protrusion is over-extruded. Furthermore, as the upper die is pressed together, both sides of the terminal plastically extend outward. Since the crimping area of ​​the die is open on both sides, this can eventually lead to the formation of flash on the terminal surface, affecting the quality of the wire harness terminal. Summary of the Invention

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a copper tube terminal crimping die with convex ribs.

[0006] The object of the present invention is achieved through the following technical solutions: The pressing joint is formed on the upper and lower dies, and the pressing joint is formed on the upper and lower dies, and the pressing joint is formed on the upper and lower dies. The pressing joint is formed on the upper and lower dies, and the pressing joint is formed on the upper and lower dies. The pressing joint is formed on the upper and lower dies, and the pressing joint is formed on the upper and lower dies. The pressing joint is formed on the upper and lower dies. The pressing joint is formed on the upper and lower dies. The pressing joint is formed on the upper and lower dies. The pressing joint is formed on the upper and lower dies. The pressing joint is formed on the upper and lower dies.

[0007] Preferably, the angle is 120°.

[0008] Preferably, a guide column is provided on the lower die, and a guide groove is provided through the upper die, and the guide column is adapted to the guide groove.

[0009] Preferably, a connecting block is provided in each of the upper die and the lower die, and the sliding groove is defined between the connecting block and the fixing block.

[0010] Preferably, the avoidance groove is constructed on the connecting block.

[0011] Preferably, a limiting groove is provided on the side wall of the dynamic pressure block, and a limiting column is correspondingly provided in the sliding groove and is engaged with the limiting groove.

[0012] Preferably, a mold handle is provided on the end surface of the upper mold.

[0013] Preferably, a mounting groove is provided on the abutting portion, and the convex rib is slidably adapted to fit into the mounting groove. An adjusting member is also provided in the upper mold, and the adjusting member is adapted to drive the convex rib to be retracted into the mounting groove as the mold is closed.

[0014] Preferably, the adjusting member includes a linear ejection mechanism disposed in the fixed pressure block, and an ejection end of the linear ejection mechanism is connected to the rib.

[0015] Preferably, the mounting groove is filled with liquid, and a liquid storage chamber is further provided in the solid pressure block, the liquid storage chamber is connected to the mounting groove through a flow channel, the adjusting member includes an airbag provided in the sliding groove, the airbag is connected to the mounting groove through a pipeline, and a push plate is elastically provided in the liquid storage chamber, and electromagnetic valves are provided in the flow channel and the pipeline; when the upper mold and the lower mold are closed, the dynamic pressure block can squeeze the airbag to press the gas into the mounting groove.

[0016] The beneficial effects of the present invention are: 1. The present invention utilizes ribs to crimp the terminals. These ribs divide the copper wire within the terminal into two equal parts, ensuring that the copper wire is evenly compressed and deformed. Compared to existing technologies, the present invention utilizes axially extending ribs to crimp the terminals, resolving the technical issue of using protrusions to achieve uniform crimping.

[0017] 2. The present invention forms a circumferentially closed crimping interface by cooperating with two dynamic pressure blocks and two fixed pressure blocks, thereby confining the terminal within the crimping interface during crimping without easily generating surface burrs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural diagram of an existing crimping die; Figure 2 It is a structural diagram of an embodiment; Figure 3 It is a structural diagram of the press interface; Figure 4 is a schematic diagram of the structure of the convex rib; Figure 5 This is a schematic diagram of the installation position of the linear ejection mechanism; Figure 6 Schematic diagram of the structure of the airbag; Figure 7 for Figure 6 A magnified view of part A; Figure 8 This is a schematic diagram showing the copper core wire being compressed and divided equally on both sides.

[0019] Figure numerals: 1. upper mold; 2. lower mold; 3. sliding groove; 4. dynamic pressure block; 5. fixed pressure block; 6. first molding surface; 7. abutment portion; 8. pushing portion; 9. avoidance groove; 10. pressing interface; 11. convex rib; 12. guide column; 13. guide groove; 14. connecting block; 15. limiting groove; 16. mold handle; 17. mounting groove; 18. adjusting part; 19. linear ejection mechanism; 20. liquid storage chamber; 21. flow channel; 22. airbag; 23. pipeline; 24. push plate; 25. solenoid valve; 26. second molding surface; 27. fixing plate; 28. frame. DETAILED DESCRIPTION

[0020] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the embodiments. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work shall fall within the scope of protection of the present invention.

[0021] like Figures 2 to 8 As shown, a ribbed crimping die for copper tube terminals comprises an upper die 1 and a lower die 2, which are positioned opposite each other. The lower die 2 can be mounted on a workbench of a press, such as a punch press or hydraulic press. The upper die 1 is provided with a die handle 16 at the top to connect to the stamping component of the press. Driven by the power of the press, the upper and lower dies 1 and 2 can be closed.

[0022] The upper mold 1 and lower mold 2 have essentially the same structure. For example, both include a fixed plate 27, with a frame 28 disposed on the end surface of the fixed plate 27. The frame 28 is formed by two connecting plates joined together by bolts or other fasteners. Furthermore, each frame 28 houses a fixed pressure block 5, a dynamic pressure block 4, and a connecting block 14.

[0023] More specifically, an inclined sliding groove 3 is defined between the fixed pressure block 5 and the connecting block 14. The dynamic pressure block 4 slides within the sliding groove 3. A spring (not shown) is also connected to the dynamic pressure block 4, which can eject the dynamic pressure block 4 from the sliding groove 3. The opposing end surfaces of the two fixed pressure blocks 5 are each formed with a first forming surface 6. These first forming surfaces 6 specifically comprise an abutment portion 7 and a push portion 8 that form an angle. For example, this angle can be preferably 120 degrees to facilitate the pushing of the dynamic pressure block 4, which will be described below. In addition, each connecting block 14 is also formed with a relief groove 9.

[0024] In some examples, the frame 28 is not limited to being formed by overlapping two connecting plates. For example, it can be formed by a single connecting plate with a connecting groove. It is understood that in the scheme of integrally forming the frame 28, the connecting block 14 is not formed as a separate component, and the avoidance groove 9 can be directly formed on the frame 28.

[0025] The first difference between upper mold 1 and lower mold 2 lies in the arrangement order of the fixed pressure block 5, dynamic pressure block 4, and relief groove 9. For example, in upper mold 1, the arrangement order is: fixed pressure block 5, dynamic pressure block 4, and relief groove 9; in lower mold 2, the arrangement order is: relief groove 9, dynamic pressure block 4, and fixed pressure block 5.

[0026] During mold closing, the dynamic pressure block 4 in the upper mold 1 abuts the fixed pressure block 5 in the lower mold 2, specifically the pusher 8 adapted for the fixed pressure block 5. Similarly, the dynamic pressure block 4 in the lower mold 2 abuts the pusher 8 of the upper mold 1. As mold closing proceeds, the dynamic pressure block 4, under the abutment of the pusher 8, slides into the sliding groove 3. At this point, the two dynamic pressure blocks 4 and the two fixed pressure blocks 5 sequentially enclose a gradually tapering press joint 10. Simultaneously, the ends of the fixed pressure blocks 5 gradually extend into the corresponding avoidance grooves 9, thereby preventing interference with mold closing.

[0027] The crimping joint 10 is specifically defined by the first molding surfaces 6 of the two fixed pressure blocks 5 and the second molding surface 26 of the dynamic pressure block 4 near the abutment portion 7. The terminal to be crimped is placed into the crimping joint 10, and after the mold is closed, the terminal is crimped into the desired shape. Unlike the common hexagonal crimping dies in the prior art, the abutment portion 7 on the fixed pressure block 5 of the present crimping die is capable of exerting a relative vertical crimping force on the terminal. Therefore, a rib 11 can be provided on the abutment portion 7 to crimp the terminal with the rib 11.

[0028] It should be understood that in the prior art, terminals are often crimped with raised points by providing them in the upper die 1. While this improves the strength of the terminal after crimping to a certain extent, the contact surface between the raised point and the terminal is too concentrated (from a macroscopic perspective, the contact between the raised point and the terminal is point-to-surface contact), which ultimately leads to uneven pressure on the terminal, affecting the quality of the wiring harness terminal. In the present invention, the raised rib 11 is preferably adapted to extend axially along the crimping interface 10. In this way, when the raised rib 11 abuts and compresses the terminal, it can divide the copper core wire within the terminal into two equal parts in the form of line-to-surface contact, thereby ensuring that the copper core wire is subjected to relatively uniform extrusion deformation. Figure 8 FIG2 shows a state diagram of the terminal in which the rib 11 divides the copper core wire into two equal parts when the terminal is crimped.

[0029] In addition, since the pressure interface 10 of the present invention is circumferentially closed, the terminal can be confined within the pressure interface 10 during crimping, and surface burrs are less likely to be generated.

[0030] In some embodiments, guide posts 12 are further provided on the lower mold 2, and guide grooves 13 are correspondingly provided through the upper mold 1, with the guide posts 12 fitting within the guide grooves 13. During mold closing, the guide posts 12 and guide grooves 13 provide guidance for a more stable closing process and a more precise closing position for the upper and lower molds 1 and 2.

[0031] For example, the sidewalls of the dynamic pressure block 4 further include a limit slot 15 extending along the length of the sliding slot 3. A corresponding limit post (not shown) is also provided within the sliding slot 3, engaging with the limit slot 15. When the dynamic pressure block 4 is received within the sliding slot 3, similar to the guide post 12 described above, the engagement of the limit post with the limit slot 15 ensures a more stable and reliable sliding motion of the dynamic pressure block 4. In a preferred embodiment, the limit post can be a bolt that passes through the frame 28 and extends into the limit slot 15.

[0032] like Figure 5 、 Figure 6As shown, in a preferred embodiment, a mounting groove 17 is formed on the abutment portion 7, and the rib 11 is specifically a block and is adapted to slide into the mounting groove 17. Furthermore, an adjustment member 18 is provided within the upper mold 1, which allows the rib 11 to be retracted into the mounting groove 17 during the mold closing process. It is understood that during mold closing, the rib 11 will immediately abut the terminal and divide the copper core wire within the terminal into two equal parts for crimping. However, at this time, the portion of the terminal outside the rib 11 is either not yet in contact with the mold or is subjected to a compressive force less than that of the rib 11, ultimately affecting the crimping quality of the terminal. In the present invention, the adjustment member 18 allows the rib 11 to be retracted into the mounting groove 17 after the rib 11 divides the copper core wire within the terminal into two equal parts, thereby reducing the compressive force of the rib 11 on the terminal and further improving the uniformity of the terminal crimping.

[0033] In some examples, the adjustment member 18 may preferably include a linear ejection mechanism 19 disposed within the fixed pressure block 5. For example, the linear ejection mechanism 19 may be an ejection device such as an electric cylinder or a hydraulic cylinder having an ejection end, and the rib 11 is connected to the ejection end. After the rib 11 abuts the terminal for a threshold time, the linear ejection mechanism 19 can be actively controlled to gradually retract the rib 11 into the mounting groove 17, thereby reducing the pressure exerted by the rib 11 on the terminal.

[0034] In other examples, the mounting groove 17 is filled with a liquid, such as hydraulic oil, which maintains the rib 11 in a position protruding from the mounting groove 17 to provide initial contact with the terminal. Furthermore, a liquid reservoir 20 is provided within the pressure block 5, and the liquid reservoir 20 is connected to the mounting groove 17 via a flow channel 21. The adjustment member 18 includes an airbag 22 disposed within the sliding groove 3, which is connected to the mounting groove 17 via a pipe. A solenoid valve 25 is provided within both the flow channel 21 and the pipe.

[0035] During mold closing, the mounting groove 17 remains filled with liquid, and the rib 11 abuts the terminal, dividing the copper wire inside it into two equal parts. Simultaneously, the dynamic pressure block 4 retracts into the sliding groove 3, squeezing the airbag 22. After a certain threshold time, the two solenoid valves 25 are controlled to be open, allowing the gas in the airbag 22 to enter the mounting groove 17 through the pipe. Under pressure, the liquid in the mounting groove 17 enters the liquid storage chamber 20 through the flow channel 21. At this point, the mounting groove 17 remains filled with gas. Because the compressibility of gas is greater than that of liquid, the rib 11 can be passively retracted into the mounting groove 17 under the action of the mold closing force, thus preventing excessive squeezing of the terminal.

[0036] For example, a push plate 24 is elastically provided in the liquid storage chamber 20. After mold separation, the dynamic pressure block 4 will re-pop out under the action of the spring, the airbag 22 will re-expand and suck the gas in the installation groove 17 back. Then, the push plate 24 can push the liquid in the liquid storage chamber 20 back into the installation groove 17 under the action of the elastic force, and finally the two solenoid valves 25 will be re-closed to prepare for the next mold closing and pressing.

[0037] The foregoing description is merely a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the form disclosed herein and should not be construed as excluding other embodiments. Rather, the present invention can be used in various other combinations, modifications, and environments and can be modified within the scope of the concept described herein through the above teachings or techniques or knowledge in the relevant field. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention are intended to be protected by the appended claims.

Claims

1. A copper tube terminal with convex rib crimping die, comprising an upper die (1) and a lower die (2) facing each other, Its characteristics are: The upper mold (1) and the lower mold (2) are both provided with a sliding groove (3), and a dynamic pressure block (4) is elastically arranged in the sliding groove (3). The upper mold (1) and the lower mold (2) are also provided with a fixed pressure block (5), and the fixed pressure block (5) is provided with a first molding surface (6). The first molding surface (6) includes an abutting portion (7) and a pushing portion (8) formed at an angle. The dynamic pressure block (4) of one of the upper mold (1) and the lower mold (2) abuts against the solid pressure block (5) of the other, and the dynamic pressure block (4) abuts against the corresponding pushing portion (8). The upper mold (1) and the lower mold (2) are also both provided with a avoidance groove (9); When the upper mold (1) and the lower mold (2) are closed, the end of the fixed pressure block (5) of one of the upper mold (1) and the lower mold (2) extends into the avoidance groove (9) of the other, and the two dynamic pressure blocks (4) and the two fixed pressure blocks (5) are sequentially surrounded to define a pressing interface (10), and a convex rib (11) is provided on the abutting portion (7) of the fixed pressure block (5) of the upper mold (1), and the convex rib (11) is arranged to extend axially along the pressing interface (10).

2. The copper tube terminal with convex rib crimping die according to claim 1, Its characteristics are: The angle is 120°.

3. The copper tube terminal with convex rib crimping die according to claim 1, Its characteristics are: The lower die (2) is provided with a guide column (12), the upper die (1) is provided with a guide groove (13) penetrating therethrough, and the guide column (12) is adapted to fit into the guide groove (13).

4. The copper tube terminal with convex rib crimping die according to claim 1, Its characteristics are: The upper mold (1) and the lower mold (2) are both provided with a connecting block (14), and the sliding groove (3) is defined between the connecting block (14) and the fixing block (5).

5. The copper tube terminal with convex rib crimping die according to claim 4, Its characteristics are: The avoidance groove (9) is constructed on the connecting block (14).

6. The copper tube terminal with convex rib crimping die according to claim 1, Its characteristics are: A limiting groove (15) is provided on the side wall of the dynamic pressure block (4), and a limiting column which is clamped in the limiting groove (15) is correspondingly arranged in the sliding groove (3).

7. The copper tube terminal with convex rib crimping die according to claim 1, Its characteristics are: A die handle (16) is provided on the end surface of the upper die (1).

8. The copper tube terminal with convex rib crimping die according to claim 1, Its characteristics are: The abutment portion (7) is provided with a mounting groove (17), and the convex rib (11) is slidably adapted to fit into the mounting groove (17). An adjusting member (18) is also provided in the upper mold (1), and the adjusting member (18) is adapted to drive the convex rib (11) to be retracted into the mounting groove (17) as the mold is closed.

9. The copper tube terminal with convex rib crimping die according to claim 8, Its characteristics are: The adjusting member (18) comprises a linear ejection mechanism (19) arranged in the fixed pressure block (5), and an ejection end of the linear ejection mechanism (19) is connected to the convex rib (11).

10. The copper tube terminal with convex rib crimping die according to claim 8, Its characteristics are: The mounting groove (17) is filled with liquid, the solid pressure block (5) is further provided with a liquid storage cavity (20), the liquid storage cavity (20) and the mounting groove (17) are connected via a flow channel (21), the adjusting member (18) comprises an air bag (22) arranged in the sliding groove (3), the air bag (22) and the mounting groove (17) are connected via a pipeline (23), a push plate (24) is elastically provided in the liquid storage cavity (20), and electromagnetic valves (25) are provided in both the flow channel (21) and the pipeline (23); When the upper mold (1) and the lower mold (2) are closed, the dynamic pressure block (4) can squeeze the air bag (22) to press the gas into the installation groove (17).

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