A processing technology for metal soft connection

Abstract

The present invention relates to the field of metal material processing technology, and specifically to a processing technology for metal soft connection, which aims to solve the problem in the prior art that copper wire is easily oxidized during the production process, resulting in a high resistivity of the overall copper braided belt. The oxygen content in the smelting chamber is effectively reduced by first preheating at high temperature and flushing with inert gas, and the copper wire and filamentary MXene are mixed and woven, and the temperature rise of the copper braided belt is effectively reduced by the good conductive effect and wear resistance of MXene itself. The present invention can effectively improve the conductive effect of the copper braided belt by adding a certain proportion of Ni, Sn, and P and adding a certain amount of filamentary MXene during weaving, so that the useful power conversion of the soft connection is more reliable.

Description

Technical Field

[0001] The invention relates to the technical field of metal material processing, and in particular to a processing technology for metal soft connection. Background Art

[0002] MXene is a two-dimensional material. MXene is the result of research at Drexel University in the United States. Unlike traditional batteries, this material provides more channels for the movement of ions, greatly increasing the speed of ion movement.

[0003] In the prior art, metal flexible connections mainly use refined copper and a certain proportion of metallic silver to improve the conductivity of the copper wire and reduce the heat loss of the flexible connection. During processing, traditional copper braided belts need to be in a high-temperature environment for many times, which easily causes the surface of the copper wire to oxidize, thereby increasing its resistivity and reducing its conductivity. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] In order to solve the above problems, the present invention proposes a processing technology for a metal soft connection with high conductive efficiency, copper wire being not easy to be oxidized and low resistivity.

[0006] (II) Technical solution

[0007] A processing technology for metal flexible connection of the present invention mainly comprises the following steps:

[0008] S1. Copper wire preparation

[0009] The raw materials are prepared according to the mass percentage of 94.5-95.5% Cu, 1.5-2% Ni, 1.5-2% Sn, 0.5-1.5% P, and the balance is inevitable impurities, the raw materials are placed in a vacuum furnace filled with inert gas for smelting to obtain a raw material solution, the raw material solution is cast into a plurality of plate-shaped molds to form a copper plate, the copper plate is rolled into a copper strip, and finally the copper strip is drawn into a copper wire and annealed to eliminate stress;

[0010] S2. Preparation of copper braided belt

[0011] The copper wire obtained in S1 and the filamentous MXene are woven into a woven tape with a width of 1.5-1.7 cm in a ratio of 30-35:3, and the woven tape is cleaned and dried by ultrasonic cleaning;

[0012] S3, copper braided belt treatment

[0013] Hot-pressing the two ends of the braided belt obtained in S2 into rectangular blocks, wherein the braided belt is pressed in a vacuum environment filled with inert gas, and after the hot-pressed braided belt is cooled, grinding the rectangular block of the braided belt to remove burrs;

[0014] S4, Punching

[0015] Cut through holes on the rectangular blocks at both ends of the braided belt obtained in S3 by using a water jet cutting device or a laser cutting device, and grind the inside of the through holes;

[0016] S5. Assembly

[0017] The braid obtained in S4 is assembled with the terminal by cold pressing, and the curvature is adjusted to obtain a braid soft connection.

[0018] (III) Beneficial effects

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] (1) In the present invention, by adding a certain proportion of Ni, Sn, and P and adding a certain amount of filamentous MXene during weaving, the conductive effect of the copper braided belt can be effectively improved, making the useful power conversion of the soft connection more reliable.

[0021] (2) In the present invention, by maintaining an oxygen-free environment when heating is required, the risk of oxidation of the copper wire is greatly reduced, thereby ensuring that the copper wire achieves the rated resistance. DETAILED DESCRIPTION

[0022] The present invention aims to solve the problem in the prior art that copper wire is easily oxidized during the production process, resulting in a relatively high resistivity of the overall copper braided belt. By first performing high-temperature preheating and flushing with inert gas, the oxygen content in the smelting chamber is effectively reduced, and copper wire and filamentary MXene are mixed and woven. The temperature rise of the copper braided belt is effectively reduced through the good conductivity and wear resistance of MXene itself.

[0023] Example 1

[0024] A processing technology for metal flexible connection of the present application mainly includes steps S1-S5;

[0025] S1. Copper wire preparation

[0026] The raw materials are prepared according to the mass percentage of 95% Cu, 2% Ni, 1.5% Sn, 0.5% P, and the balance is inevitable impurities, the raw materials are placed in a vacuum furnace filled with inert gas for smelting to obtain a raw material solution, the raw material solution is cast into a plurality of plate-shaped molds to form a copper plate, the copper plate is rolled into a copper strip, and finally the copper strip is drawn into a copper wire and annealed to eliminate stress;

[0027] The process parameters for vacuum melting of raw materials are as follows: first, the vacuum melting furnace is preheated to 200°C, the vacuum melting furnace is purged with inert gas to reduce the oxygen concentration therein, P, Sn, Cu, and Ni in the above-mentioned proportions are placed in the vacuum melting furnace in turn for melting, and then stirred to obtain a raw material solution.

[0028] Zone smelting is carried out in the vacuum furnace, wherein the heating temperature of the first smelting chamber is set at 220°C, the heating temperature of the second smelting chamber is set at 1460°C, the vacuum degree of the first smelting chamber is 5.8Pa, the vacuum degree of the second smelting chamber is 9.4Pa, and the smelting temperature of the two smelting chambers is 30min.

[0029] The copper wires after multiple drawing are placed into the annealing furnace at intervals of 5 mm, heated to 430°C in a high-concentration inert gas environment, and then naturally cooled to wait for the next processing.

[0030] The purpose of this step is to raise the temperature in the vacuum melting furnace to 200°C before smelting, thereby reducing the oxygen concentration therein, and then flush the vacuum melting furnace with a high-concentration, detoxifying and harmless inert gas, such as helium, so that the interior is filled with inert gas and oxygen is evacuated to a great extent to prevent oxidation of the metal after smelting.

[0031] The use of Ni, Sn, and P in a ratio of approximately 4:3:1 can improve the conductive efficiency of the copper wire to a certain extent, and thus, compared with the copper wire doped with metallic silver, the temperature rise of the copper wire prepared by the present invention is lower when the current of the same magnitude passes through it.

[0032] Since Sn and P have low boiling points, in order to prevent them from vaporizing when heated, a vacuum melting furnace with two melting chambers is used to melt the raw materials, that is, the melting temperature of the first melting chamber is set at about 220°C, which is just enough to melt Sn and P; the melting temperature of the second melting chamber is set at about 1460°C, which is just enough to melt Cu and Ni, and after 30 minutes of melting, the solutions in the two melting chambers are mixed and continuously stirred.

[0033] S2. Preparation of copper braided belt

[0034] The copper wire obtained in S1 and the filamentous MXene were woven into a 1.5 cm wide braided belt in a ratio of 30:3. The braided belt was cleaned and dried by ultrasonic cleaning. The braiding angle of the copper wire and the filamentous MXene was 75°, and a layer of Zn was electroplated on the outer surface of the braided belt after drying.

[0035] The purpose of this step is to mix and weave filamentary MXene with good conductive and wear-resistant effects in a certain proportion, and a layer of Zn is plated on the outer surface of the woven belt to form an anti-oxidation layer, which not only improves the anti-oxidation performance of the copper wire, but also prevents the copper wire from being oxidized by contact with oxygen in the air during use, thereby increasing the resistivity.

[0036] S3, copper braided belt treatment

[0037] Hot-pressing the two ends of the braided belt obtained in S2 into rectangular blocks, wherein the braided belt is pressed in a vacuum environment filled with inert gas, and after the hot-pressed braided belt is cooled, grinding the rectangular block of the braided belt to remove burrs;

[0038] This step aims to remove as much oxygen as possible in the processing environment where the braided belt needs to be heat treated, that is, when the braided belt is hot pressed, the air in the chamber of the hot pressing equipment needs to be extracted and filled with argon gas with a concentration greater than 99.8%. The cooling of the braided belt is also completed in the chamber filled with argon gas, and at this time, the argon gas is still kept filled in it.

[0039] S4, Punching

[0040] Cut through holes on the rectangular blocks at both ends of the braided belt obtained in S3 by using a water jet cutting device or a laser cutting device, and grind the inside of the through holes;

[0041] Specifically, before grinding the rectangular block, the size of the rectangular block can be trimmed, that is, the four sides of the rectangular block are cut before grinding, and after the rectangular block of a predetermined size is obtained, the middle part is cut and punched, and the entire rectangular block is ground.

[0042] S5. Assembly

[0043] The braid obtained in S4 is assembled with the terminal by cold pressing, and the curvature is adjusted to obtain a braid soft connection.

[0044] Compared with the prior art of connecting the rectangular block and the terminal by welding, interference cold pressing requires lower technical proficiency, has a higher fault tolerance rate and effectively prevents the problem of resonance between the terminal and the rectangular block during use. Welding requires high technical proficiency. Once bubbles are generated in the weld or the welding is not firm, the connection strength between the terminal and the rectangular block will be greatly reduced. In addition, welding can easily destroy the anti-oxidation layer on the surface of the copper wire, causing the copper wire to oxidize during the welding process.

[0045] Example 2

[0046] A processing technology for metal flexible connection of the present application mainly includes steps S1-S5;

[0047] S1. Copper wire preparation

[0048] The raw materials are prepared according to the mass percentage of 95.5% Cu, 1.9% Ni, 1.8% Sn, 0.7% P, and the balance is inevitable impurities, the raw materials are placed in a vacuum furnace filled with inert gas for smelting to obtain a raw material solution, the raw material solution is cast into a plurality of plate-shaped molds to form a copper plate, the copper plate is rolled into a copper strip, and finally the copper strip is drawn into a copper wire and annealed to eliminate stress;

[0049] The process parameters for vacuum melting of raw materials are as follows: first, the vacuum melting furnace is preheated to 200°C, the vacuum melting furnace is purged with inert gas to reduce the oxygen concentration therein, P, Sn, Cu, and Ni in the above-mentioned proportions are placed in the vacuum melting furnace in turn for melting, and then stirred to obtain a raw material solution.

[0050] Zone smelting is carried out in the vacuum furnace, wherein the heating temperature of the first smelting chamber is set at 220°C, the heating temperature of the second smelting chamber is set at 1460°C, the vacuum degree of the first smelting chamber is 5.8Pa, the vacuum degree of the second smelting chamber is 9.4Pa, and the smelting temperature of the two smelting chambers is 30min.

[0051] The copper wires after multiple drawing are placed into the annealing furnace at intervals of 5 mm, heated to 430°C in a high-concentration inert gas environment, and then naturally cooled to wait for the next processing.

[0052] S2. Preparation of copper braided belt

[0053] The copper wire obtained in S1 and the filamentous MXene were woven into a 1.5 cm wide braided belt in a ratio of 30:3. The braided belt was cleaned and dried by ultrasonic cleaning. The braiding angle of the copper wire and the filamentous MXene was 75°, and a layer of Zn was electroplated on the outer surface of the braided belt after drying.

[0054] S3, copper braided belt treatment

[0055] Hot-pressing the two ends of the braided belt obtained in S2 into rectangular blocks, wherein the braided belt is pressed in a vacuum environment filled with inert gas, and after the hot-pressed braided belt is cooled, grinding the rectangular block of the braided belt to remove burrs;

[0056] S4, Punching

[0057] Cut through holes on the rectangular blocks at both ends of the braided belt obtained in S3 by using a water jet cutting device or a laser cutting device, and grind the inside of the through holes;

[0058] S5. Assembly

[0059] The braid obtained in S4 is assembled with the terminal by cold pressing, and the curvature is adjusted to obtain a braid soft connection.

[0060] Example 3

[0061] A processing technology for metal flexible connection of the present application mainly includes steps S1-S5;

[0062] S1. Copper wire preparation

[0063] The raw materials are prepared according to the mass percentage of 95% Cu, 2% Ni, 1.5% Sn, 0.5% P, and the balance is inevitable impurities, the raw materials are placed in a vacuum furnace filled with inert gas for smelting to obtain a raw material solution, the raw material solution is cast into a plurality of plate-shaped molds to form a copper plate, the copper plate is rolled into a copper strip, and finally the copper strip is drawn into a copper wire and annealed to eliminate stress;

[0064] The process parameters for vacuum melting of raw materials are as follows: first, the vacuum melting furnace is preheated to 200°C, the vacuum melting furnace is purged with inert gas to reduce the oxygen concentration therein, P, Sn, Cu, and Ni in the above-mentioned proportions are placed in the vacuum melting furnace in turn for melting, and then stirred to obtain a raw material solution.

[0065] Zone smelting is carried out in the vacuum furnace, wherein the heating temperature of the first smelting chamber is set at 220°C, the heating temperature of the second smelting chamber is set at 1460°C, the vacuum degree of the first smelting chamber is 5.8Pa, the vacuum degree of the second smelting chamber is 9.4Pa, and the smelting temperature of the two smelting chambers is 30min.

[0066] The copper wires after multiple drawing are placed into the annealing furnace at intervals of 5 mm, heated to 430°C in a high-concentration inert gas environment, and then naturally cooled to wait for the next processing.

[0067] S2. Preparation of copper braided belt

[0068] The copper wire and filamentous MXene obtained in S1 were woven into a 1.5 cm wide braided belt in a ratio of 35:3. The braided belt was cleaned and dried by ultrasonic cleaning. The braiding angle of the copper wire and the filamentous MXene was 75°, and a layer of Zn was electroplated on the outer surface of the braided belt after drying.

[0069] S3, copper braided belt treatment

[0070] Hot-pressing the two ends of the braided belt obtained in S2 into rectangular blocks, wherein the braided belt is pressed in a vacuum environment filled with inert gas, and after the hot-pressed braided belt is cooled, grinding the rectangular block of the braided belt to remove burrs;

[0071] S4, Punching

[0072] Cut through holes on the rectangular blocks at both ends of the braided belt obtained in S3 by using a water jet cutting device or a laser cutting device, and grind the inside of the through holes;

[0073] S5. Assembly

[0074] The braid obtained in S4 is assembled with the terminal by cold pressing, and the curvature is adjusted to obtain a braid soft connection.

[0075] Example 4

[0076] A processing technology for metal flexible connection of the present application mainly includes steps S1-S5;

[0077] S1. Copper wire preparation

[0078] The raw materials are prepared according to the mass percentage of 94.5% Cu, 2% Ni, 2% Sn, 1.1% P, and the balance is inevitable impurities, the raw materials are placed in a vacuum furnace filled with inert gas for smelting to obtain a raw material solution, the raw material solution is cast into a plurality of plate-shaped molds to form a copper plate, the copper plate is rolled into a copper strip, and finally the copper strip is drawn into a copper wire and annealed to eliminate stress;

[0079] The process parameters for vacuum melting of raw materials are as follows: first, the vacuum melting furnace is preheated to 200°C, the vacuum melting furnace is purged with inert gas to reduce the oxygen concentration therein, P, Sn, Cu, and Ni in the above-mentioned proportions are placed in the vacuum melting furnace in turn for melting, and then stirred to obtain a raw material solution.

[0080] Zone smelting is carried out in the vacuum furnace, wherein the heating temperature of the first smelting chamber is set at 220°C, the heating temperature of the second smelting chamber is set at 1460°C, the vacuum degree of the first smelting chamber is 5.8Pa, the vacuum degree of the second smelting chamber is 9.4Pa, and the smelting temperature of the two smelting chambers is 30min.

[0081] The copper wires after multiple drawing are placed into the annealing furnace at intervals of 5 mm, heated to 430°C in a high-concentration inert gas environment, and then naturally cooled to wait for the next processing.

[0082] S2. Preparation of copper braided belt

[0083] The copper wire and filamentous MXene obtained in S1 were woven into a 1.5 cm wide braided belt in a ratio of 35:3. The braided belt was cleaned and dried by ultrasonic cleaning. The braiding angle of the copper wire and the filamentous MXene was 75°, and a layer of Zn was electroplated on the outer surface of the braided belt after drying.

[0084] S3, copper braided belt treatment

[0085] Hot-pressing the two ends of the braided belt obtained in S2 into rectangular blocks, wherein the braided belt is pressed in a vacuum environment filled with inert gas, and after the hot-pressed braided belt is cooled, grinding the rectangular block of the braided belt to remove burrs;

[0086] S4, Punching

[0087] Cut through holes on the rectangular blocks at both ends of the braided belt obtained in S3 by using a water jet cutting device or a laser cutting device, and grind the inside of the through holes;

[0088] S5. Assembly

[0089] The braid obtained in S4 is assembled with the terminal by cold pressing, and the curvature is adjusted to obtain a braid soft connection.

[0090] Table 1 shows the soft connection ratio, process parameters and compliance rate prepared in each embodiment

[0091]

[0092] It can be seen from Table 1 that the detected components of the products of Examples 1-4 are slightly different from the raw material ratio components, and the ratio of Ni to Sn in the copper wire has a certain improvement effect on the conductivity of the copper wire itself; and when MXene accounts for a large proportion, the completion rate of the target resistance is also improved to a certain extent, that is, the addition of a certain amount of MXene can have a certain improvement effect on the conductivity of the soft connection.

[0093] The above-described embodiments are merely descriptions of preferred implementations of the present invention, and are not intended to limit the concept and scope of the present invention. Without departing from the design concept of the present invention, various modifications and improvements made by ordinary persons in the art to the technical solution of the present invention should fall within the protection scope of the present invention, and the technical contents for which protection is sought in the present invention have been fully recorded in the claims.

Claims

1. A processing technology for metal flexible connection, characterized in that: The main steps include: S1. Copper wire preparation The raw materials are prepared according to the mass percentage of 94.5-95.5% Cu, 1.5-2% Ni, 1.5-2% Sn, 0.5-1.5% P, and the balance is inevitable impurities, the raw materials are placed in a vacuum furnace filled with inert gas for smelting to obtain a raw material solution, the raw material solution is cast into a plurality of plate-shaped molds to form a copper plate, the copper plate is rolled into a copper strip, and finally the copper strip is drawn into a copper wire and annealed to eliminate stress; S2. Preparation of copper braided belt The copper wire obtained in S1 and the filamentous MXene are woven into a woven tape with a width of 1.5-1.7 cm in a ratio of 30-35:3, and the woven tape is cleaned and dried by ultrasonic cleaning; S3, copper braided belt treatment Hot-pressing the two ends of the braided belt obtained in S2 into rectangular blocks, wherein the braided belt is pressed in a vacuum environment filled with inert gas, and after the hot-pressed braided belt is cooled, grinding the rectangular block of the braided belt to remove burrs; S4, Punching Cut through holes on the rectangular blocks at both ends of the braided belt obtained in S3 by using a water jet cutting device or a laser cutting device, and grind the inside of the through holes; S5. Assembly The braid obtained in S4 is assembled with the terminal by cold pressing, and the curvature is adjusted to obtain a braided flexible connection; In S1, the process parameters of vacuum melting of raw materials are as follows: first, preheating the vacuum melting furnace to 200±5°C, purging the vacuum melting furnace with inert gas to reduce the concentration of oxygen therein, placing the above-mentioned proportions of P, Sn, Cu, and Ni in the vacuum melting furnace in turn for melting, and then stirring to obtain a raw material solution; Zone smelting is carried out in the vacuum furnace, wherein the heating temperature of the first smelting chamber is set at 220±5°C, the heating temperature of the second smelting chamber is set at 1460±5°C, the vacuum degree of the first smelting chamber is 4.8±3Pa, the vacuum degree of the second smelting chamber is 8.4±3Pa, and the smelting temperature of the two smelting chambers is 20-30min.

2. The processing technology of metal flexible connection according to claim 1 is characterized in that: In S1, the copper wires after multiple drawing are placed into an annealing furnace at intervals of 5-6 mm, heated to 420±10° C. in a high-concentration inert gas environment, and then naturally cooled to wait for the next processing step.

3. The processing technology of metal flexible connection according to claim 2 is characterized in that: In the step S2, the braiding angle between the copper wire and the filamentous MXene is 75±5°, and a layer of Zn is electroplated on the outer surface of the braided belt after drying.

4. The processing technology of metal flexible connection according to claim 3 is characterized in that: In S5, the rectangular block and the terminal are cold-pressed with interference fit to prevent oxidation of the copper braid.

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