Cold welding die and cold welding equipment for flat copper wire

Abstract

The utility model relates to the field of welding equipment, and particularly discloses a cold welding die for a flat copper wire, namely cold welding equipment. The cold welding die comprises two symmetrically-arranged clamping block sets, each clamping block set comprises two clamping blocks, and each clamping block is provided with a clamping fixing groove. The inner wall of the clamping fixing groove comprises a bearing bottom used for abutting against the narrow face of the flat copper wire and a clamping wall used for abutting against the wide face of the flat copper wire. The fixed thinking that the size of the inner wall clamped by a cold welding mold in the round copper wire cold welding technology must be close to the size of a target copper wire is broken through, and enough friction force can be obtained only by clamping the wide face of the flat copper wire so as to promote smooth cold welding work. Therefore, the cold welding mold of a single specification can be suitable for cold welding processing of flat copper wires of multiple specifications, the mold opening cost of the cold welding mold is reduced, and the cold welding technology is promoted to be used in the field of flat copper wire welding.

Description

Technical Field

[0001] The utility model relates to the field of welding equipment, in particular to a cold welding die for flat copper wires, namely cold welding equipment. Background Art

[0002] In the processing of enameled wires, it is usually necessary to first process the conductor (usually copper wire) inside, and then perform a painting process on the conductor to finally obtain a finished product. At the present stage, the painting process usually uses die painting, and die painting has strict requirements on the dimensional uniformity of the conductor, that is, the copper wire, before painting. Only the dimensional uniformity of the copper wire obtained by drawing through a fixed-size die can meet the requirements of die painting.

[0003] In the production process of copper wires, wire blanks usually need to be stored in separate coils for the convenience, safety, etc. of transportation and winding. This also causes that in the processing of copper wires, after continuously producing and using a certain amount of wire blanks, it is necessary to replace a coil of wire blanks. At this time, a blank joint (welding the tail of the previous coil and the head of the next coil) is performed. Since the connection part of the subsequent wire blank needs to participate in the drawing process, there are requirements for the size and firmness of the connection part. Hot welding has great difficulty in controlling the size, and after hot welding, the firmness of the connection part also fluctuates greatly. Therefore, cold welding is the best technical choice.

[0004] Cold welding is a welding technology that, under normal or low temperature conditions, makes the metal surface undergo plastic deformation through specific methods such as pressurization, so as to produce "locking" between metals at the microscopic level, and then realizes the solid-state bonding of metals. In the overall process of such a connection method, it is not necessary to involve operations such as heating the metal to its melting point, etc., thus avoiding the heat-affected zone and deformation problems in traditional welding methods.

[0005] During the actual operation of cold welding, it is necessary to push the die to clamp one end of the two conductors to be welded, and then the two ends are pushed towards each other and contacted, and finally cold welding is completed by extrusion. Among them, to clamp the conductor requires that the specifications of the inner wall of the die are similar to the size of the conductor to be welded, otherwise it will lead to insufficient contact area, insufficient friction between the die and the conductor after clamping, and inability to push the conductors to squeeze each other, ultimately resulting in insufficient welding firmness.

[0006] In the prior art, cold welding is usually only applied to the processing technology of round copper wires. This is because usually a round blank of one size can meet the production of round enameled wires of multiple sizes. Therefore, a complete round wire factory only needs to be equipped with 3 to 5 cold welding dies of corresponding specifications to meet the cold welding work of all sizes of round copper wire blanks.

[0007] The specifications of flat copper wires are relatively complex, and it is difficult to directly obtain flat copper wires of multiple specifications from a single specification of flat wire blanks. Therefore, the factory needs to have the ability to manufacture flat wire blanks of multiple specifications. At the same time, in the existing technology, the inner wall of a single-specification cold welding die is similar in size to the flat wire blank to be welded, making it difficult to directly apply to the cold welding process of flat wire blanks of multiple specifications. It is difficult for the factory to further bear various production costs related to a single-specification die, including die opening, which further makes it difficult for the cold welding technology to be popularized in the field of flat copper wire welding. Summary of the Invention

[0008] The technical problem to be solved by the present invention is to provide a cold welding die for flat copper wires. Under a single specification, this die can be applied to the cold welding of flat copper wires of multiple specifications, thereby reducing the relevant die opening costs and the like in the cold welding of flat copper wires in the factory, and being conducive to the popularization and use of the cold welding technology in the field of flat copper wire welding.

[0009] The present invention is achieved through the following technical solutions.

[0010] A cold welding die for flat copper wires, characterized in that it includes two groups of symmetrically arranged clamping block groups, and each group of the clamping block groups includes two symmetrically arranged clamping blocks; in the non-working state, a clamping channel is formed between the two clamping blocks in the same group, and on each side of each clamping block close to the clamping channel, a clamping fixing groove is provided; wherein, the inner wall of the clamping fixing groove includes a supporting bottom for abutting against the narrow surface of the flat copper wire and a clamping wall for abutting against the wide surface of the flat copper wire.

[0011] It is found by the inventor's test that in the field of flat copper wire cold welding, since the wide surface area of the flat copper wire is much larger than the narrow surface area, compared with the requirement in round copper wire cold welding that the inner wall specification of the die is similar to the size of the conductor to be welded to clamp the conductor, in flat copper wire cold welding, only the wide surface of the flat copper wire needs to be clamped. Even if the narrow surface does not contact, sufficient friction can still be obtained to push the flat copper wires to squeeze towards each other to complete the cold welding.

[0012] Therefore, the supporting bottom provided in the present invention is used to ensure that the flat copper wire is placed in place, and the friction required during cold welding is only the static friction generated by the close fit between the clamping wall and the wide surface of the flat copper wire. It is found by the inventor's test that the static friction generated after clamping the flat copper wire in this structure can promote the smooth progress of the cold welding connection of the flat copper wire.

[0013] As a further improvement of the present utility model, the first working width of the clamping wall is 30 mm. When the cold welding die is placed on a tabletop, the first working width of the clamping wall presents as the vertical height of the clamping wall, which enables the clamping wall to fit closely with the wide surface of a flat copper wire with a wide-side length less than 30 mm, and this range value can cover most of the flat copper wires with different specifications currently available on the market.

[0014] As a further improvement of the present utility model, the second working width of the supporting bottom is 0.25 mm or 0.75 mm or 1.25 mm or 1.75 mm or 2.25 mm. When the cold welding die is placed on a tabletop, the second working width of the supporting bottom is the transverse width of the supporting bottom. Taking the supporting bottom with a working width of 0.25 mm as an example, when two clamping blocks in the same group are completely fitted together, the two groups of supporting bottoms can jointly generate a gap of 0.5 mm. Through the inventor's tests, under the current second working width, the cold welding die of this specification can at least adapt to the cold welding clamping work of any copper flat wire with a narrow-side width in the range of 0.5 - 1.5 mm, that is, for a copper flat wire with a narrow-side width within 1 mm of the set second working width of the supporting bottom, a relatively large clamping force can be obtained in the cold welding die of the current specification, so that the wide surface of the copper flat wire of this specification can fit closely with the clamping wall, ensuring that the required friction force during the cold welding process is sufficient and improving the applicability of the cold welding die under a single specification.

[0015] As a further improvement of the present utility model, a reset element is provided between adjacent two of the clamping blocks, which is used to separate the two fitted clamping blocks when there is no external force. During the cold welding process, it is necessary to use an external force to push adjacent clamping blocks to fit together; after the external force is removed, the reset element can push the fitted clamping blocks away from each other to return to the non-working state.

[0016] As a further improvement of the present utility model, the reset element includes a telescopic rod structure provided between adjacent two of the clamping blocks, and the telescopic rod structure includes a rod body and an elastic member sleeved outside the rod body.

[0017] As a further improvement of the present utility model, in the non-working state, a to-be-processed channel is formed between two groups of the clamping block groups, and a margin groove is provided on each side of the clamping block close to the to-be-processed channel, and the margin groove is communicated with the clamping and fixing groove, and the margin groove is used to accommodate the cold welding margin formed at the joint of the flat copper wire during cold welding.

[0018] As a further improvement of the present utility model, an observation port is provided on each of the clamping blocks, and the observation port is located at the top of the joint of the margin groove and the clamping and fixing groove on the clamping block.

[0019] As a further improvement of the present utility model, a friction enhancement structure is provided on the clamping wall.

[0020] As a further improvement of the present utility model, a boosting structure is provided on one side of the clamping block away from the clamping channel. The boosting structure includes a boosting inclined surface, and a first included angle is formed between the boosting inclined surface and the clamping wall. The first included angle is an acute angle.

[0021] In a second aspect, the present utility model provides a cold welding device equipped with any one of the above-mentioned cold welding molds for flat copper wires.

[0022] The beneficial effect of the present utility model is that it breaks the fixed thinking in the cold welding technology of round copper wires that the inner wall size of the clamping part of the cold welding mold must be similar to the size of the target copper wire. By only clamping the wide surface of the flat copper wire, sufficient friction can be obtained to smoothly promote the cold welding operation. This enables a single specification of cold welding mold to be applicable to the cold welding operations of various different specifications of flat copper wires, reduces the mold opening cost of the cold welding mold for flat copper wire cold welding technology, etc., and is conducive to promoting the use of cold welding technology in the field of flat copper wire welding. Description of the Drawings

[0023] The following drawings are provided for combination with the preferred implementation cases in the present utility model to help understand the purpose and advantages of the present utility model, where:

[0024] Figure 1 is a schematic structural diagram of the cold welding mold from the first perspective;

[0025] Figure 2 is a schematic structural diagram of the cold welding mold from the second perspective;

[0026] Figure 3 is a schematic structural diagram of the cold welding device after the cold welding mold is installed;

[0027] Figure 4 is a cross-sectional view of the flat copper wire. Detailed Embodiments

[0028] The present utility model will be further described in detail below with reference to the drawings and implementation cases.

[0029] The orientation terms such as up, down, left, right, front, back, front side, back side, top, bottom, etc. mentioned or likely to be mentioned in this specification are defined with respect to the structures shown in the respective drawings. The terms "inner" and "outer" respectively refer to the directions towards or away from the geometric center of a specific component. They are relative concepts and may therefore change accordingly depending on their different positions and different usage states. Therefore, these or other orientation terms should not be construed as restrictive terms.

[0030] In this embodiment, the object of cold welding connection is flat copper wire, and the cross-sectional view of the flat copper wire is as shown in Figure 4 shown, which includes a narrow side W' and a wide side L'. The surface where the wide side L' of the cross-section of the flat copper wire is located is the wide surface, and the surface where the narrow side W' of the cross-section is located is the narrow surface. In the flat copper wire, the length of the wide side L' is greater than the width of the narrow side W', so the area of the wide surface is much larger than that of the narrow surface.

[0031] Embodiment 1:

[0032] This embodiment includes a cold welding die for flat copper wire, as shown in Figures 1 - 2 shown. This cold welding die includes two groups of clamping block groups 1 symmetrically arranged along the first axis L1. Each group of the clamping block groups 1 includes two clamping blocks 101 symmetrically arranged along the second axis L2, where the first axis L1 and the second axis L2 are perpendicular to each other.

[0033] In the non-working state of the cold welding die, a clamping channel 102 is formed between the two clamping blocks 101 in the same group for one end of the flat copper wire to be cold welded to enter and pass through. On one side of each clamping block 101 close to the clamping channel 102, a clamping fixing groove 101-1 is provided. The inner wall of the clamping fixing groove 101-1 includes a supporting bottom 101-1a for abutting against the narrow surface of the flat copper wire and a clamping wall 101-1b for abutting against the wide surface of the flat copper wire. When the flat copper wire is placed in the clamping channel 102, it can approach and fit with the clamping fixing groove 101-1 on any one of the clamping blocks 101, so that the narrow surface of the flat copper wire can abut against the supporting bottom 101-1a, and the supporting bottom 101-1a plays a positioning role for the flat copper wire; while the wide surface of the flat copper wire is in contact with the clamping wall 101-1b in the current clamping fixing groove 101-1.

[0034] During cold welding, first, the two clamping blocks 101 in the same group need to approach each other to ensure that the clamping walls 101-1b of the two clamping blocks 101 are respectively in close contact with the two wide surfaces of the flat copper wire, ensuring that the clamping block group 1 generates a large enough static friction force on the flat copper wire it clamps. Then, the two groups of clamping block groups 1 are pushed to approach each other, thereby driving the two ends of the two sections of flat copper wire clamped on them to approach each other, form extrusion, and finally complete the cold welding work.

[0035] Preferably, when the cold welding die is placed horizontally, the first working width W1 of the clamping wall 101-1b is as shown in Figure 2 shown. In this embodiment, the first working width W1 of the clamping wall 101-1b is 30 mm, ensuring that the clamping wall 101-1b can be in close contact with the wide surface of the flat copper wire with a wide side L' length of less than 30 mm to provide sufficient static friction force.

[0036] Preferably, when the cold welding mold is placed horizontally, the second working width W2 of the supporting bottom 101-1a is as follows: Figure 2 As shown, the second working width W2 of the supporting bottom 101-1a can be selected to be 0.25 mm, 0.75 mm, 1.25 mm, 1.75 mm, or 2.25 mm. In this embodiment, the second working width W2 is 0.25 mm, so the cold welding mold can provide sufficient clamping force for any specification of flat copper wire with a narrow side W' width of 0.5 to 1.5 mm to ensure that the clamping wall 101-1b is tightly fitted with the wide surface of the flat copper wire.

[0037] Preferably, a reset element 103 is provided between two adjacent clamping blocks 101, such as Figure 1 As shown, a reset element 103 is provided between the two clamping blocks 101 of the same group, and a reset element 103 is provided between the two clamping block groups 1. This structure ensures that after the cold welding work is completed and the thrust is lost, the cold welding mold can be pushed by the reset element 103 and automatically opened to restore to a non-working state, that is, the clamping channel 102 is restored to a state formed between the two clamping blocks 101 of the same group, so as to facilitate the removal of the flat copper wire after connection.

[0038] Preferably, if Figure 1 As shown, the reset element 103 includes a telescopic rod structure arranged between two adjacent clamping blocks 101, the telescopic rod structure includes a rod body 103-1 and an elastic component 103-2 sleeved outside the rod body 103-1. In this embodiment, the rod body 103-1 in the telescopic rod structure can be retracted into the clamping block 101, and the elastic component 103-2 is a spring.

[0039] Preferably, in a non-working state, a to-be-processed channel 104 is formed between the two groups of the clamping block groups 1, and a surplus groove 101-2 is provided on each side of the clamping block 101 close to the to-be-processed channel 104, and the surplus groove 101-2 is connected to the clamping fixing groove 101-1. During the cold welding process, when the two ends of the flat copper wire are squeezed against each other, a large block structure, i.e., cold welding surplus, will be generated at the connection, so the surplus groove 101-2 can be used to accommodate the cold welding surplus.

[0040] Preferably, each of the clamping blocks 101 is provided with an observation port 101 - 3 at the top of the connection between the residual groove 101 - 2 and the clamping fixing groove 101 - 1, so as to facilitate the user to observe the cold welding progress, cold welding results, etc.

[0041] Preferably, a friction enhancing structure is provided on the clamping wall 101 - 1 b , and in this embodiment, the friction enhancing structure is a wear-enhancing texture.

[0042] Preferably, a boosting structure 101-4 is provided on the side of the clamping block 101 away from the clamping channel 102. The boosting structure 101-4 includes a boosting inclined surface, and a first included angle α is formed between the boosting inclined surface and the clamping wall 101-1b, and the first included angle α is an acute angle.

[0043] Under this structure, as Figure 3 shown, a pushing wedge block A that can fit with this inclined surface can be provided in the corresponding cold welding equipment. When the two groups of pushing wedge blocks A approach each other, they can simultaneously push the two clamping blocks 101 in the same group closer to each other and the two groups of clamping block groups 1 closer to each other, that is, they can simultaneously complete the respective clamping work of the two sections of flat copper wire and the extrusion cold welding work of the two sections of flat copper wire, greatly improving the working efficiency of cold welding.

[0044] Embodiment 2:

[0045] A cold welding device for flat copper wire, as Figure 3 shown, is equipped with any one of the cold welding dies for flat copper wire in Embodiment 1 and can be applicable to the cold welding work of flat copper wire.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A cold welding die for flat copper wire, characterized in that: It comprises two groups of symmetrically arranged clamping block groups (1), each group of the clamping block groups (1) comprising two symmetrically arranged clamping blocks (101); In a non-working state, a clamping channel (102) is formed between two clamping blocks (101) of the same group, and a clamping fixing groove (101-1) is provided on one side of each clamping block (101) close to the clamping channel (102); The inner wall of the clamping and fixing groove (101-1) comprises a supporting bottom (101-1a) for contacting the narrow surface of the flat copper wire and a clamping wall (101-1b) for contacting the wide surface of the flat copper wire.

2. A cold welding die for flat copper wire according to claim 1, characterized in that: The first working width (W1) of the clamping wall (101-1b) is 30 mm.

3. A cold welding die for flat copper wire according to claim 2, characterized in that: The second working width (W2) of the supporting bottom (101-1a) is 0.25 mm or 0.75 mm or 1.25 mm or 1.75 mm or 2.25 mm.

4. A cold welding die for rectangular copper wire according to claim 1, characterized in that: A resetting element (103) is provided between two adjacent clamping blocks (101) for separating the two clamping blocks (101) that are in contact with each other when no external force is applied.

5. A cold welding die for rectangular copper wire according to claim 4, characterized in that: The resetting element (103) comprises a telescopic rod structure arranged between two adjacent clamping blocks (101), wherein the telescopic rod structure comprises a rod body (103-1) and an elastic component (103-2) sleeved outside the rod body (103-1).

6. A cold welding die for flat copper wire according to claim 1, characterized in that: In a non-working state, a channel to be processed (104) is formed between the two groups of the clamping block groups (1), and a surplus groove (101-2) is provided on one side of each of the clamping blocks (101) close to the channel to be processed (104), the surplus groove (101-2) being connected to the clamping fixing groove (101-1), and the surplus groove (101-2) is used to accommodate cold welding surplus formed at the connection of the flat copper wire during cold welding.

7. A cold welding die for rectangular copper wire according to claim 6, characterized in that: Each clamping block (101) is provided with an observation port (101-3), and the observation port (101-3) is located at the top of the connection between the residual groove (101-2) and the clamping fixing groove (101-1) on the clamping block (101).

8. The cold welding die for rectangular copper wire according to claim 1, characterized in that: The clamping wall (101-1b) is provided with a friction enhancing structure.

9. A cold welding die for rectangular copper wire according to claim 1, characterized in that: A boosting structure (101-4) is provided on a side of the clamping block (101) away from the clamping channel (102), the boosting structure (101-4) comprising a boosting inclined surface, the boosting inclined surface forming a first angle (α) with the clamping wall (101-1b), the first angle (α) being an acute angle.

10. A cold welding device for rectangular copper wire, characterized in that: A cold welding die for rectangular copper wire is provided.

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