CN113560365B - Processing method for improving wiredrawing strength of copper alloy - Google Patents
Processing method for improving wiredrawing strength of copper alloy Download PDFInfo
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- CN113560365B CN113560365B CN202110829456.9A CN202110829456A CN113560365B CN 113560365 B CN113560365 B CN 113560365B CN 202110829456 A CN202110829456 A CN 202110829456A CN 113560365 B CN113560365 B CN 113560365B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/04—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of bars or wire
- B21C37/047—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of bars or wire of fine wires
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/02—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working in inert or controlled atmosphere or vacuum
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/08—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of copper or alloys based thereon
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention relates to a processing method for improving the wiredrawing strength of copper alloy, which comprises the following steps: (1) Annealing heat treatment is carried out on the copper alloy wire blank with the wire diameter of 2.0-3.0mm, and the elongation percentage is more than 20%; (2) Cold-pressing the annealed copper alloy wire blank, wherein the aspect ratio after cold-pressing is 1.5-2.5; (3) And drawing the wire by using a circular die hole according to the maximum distance between the two cold-pressed cambered surfaces. According to the invention, under the condition that the wire diameter of the wire is large, the inside of the copper alloy wire is subjected to processing deformation in advance, so that the state of uniform change from the surface to the inside in the processing process of the round wire is changed, and finally, the aim of cooperative deformation of the surface and the inside of the material in the wire drawing processing process is realized, thereby achieving the aims of improving the elongation and the strength of the wire and reducing wire breakage.
Description
Technical Field
The invention relates to the technical field of electronic materials, in particular to a processing method for improving the wiredrawing strength of copper alloy.
Background
The high-strength high-conductivity copper alloy is taken as a typical electronic material, is an important material foundation for the development of modern electronic industry and science and technology, has excellent flexibility, fatigue life, electrical property and the like, is widely applied to the key foundation fields for the development of high and new technical fields such as photoelectrons, microelectronics, medical treatment, robots, aviation, aerospace and the like, and is also an important support for the development of information technology. For alloy wires used for extremely fine conductors, the wire diameter of the alloy wires is often required to be processed to 0.050mm-0.016mm, and the conventional process generally adopts direct wire drawing processing of as-cast alloy rods, but in the actual processing process, the wire is frequently broken due to insufficient control of the organization structure of the rods, the wire drawing die proportion and the wire drawing process, so that the processing efficiency is greatly influenced, and the annealing process is widely adopted at present to improve the wire drawing performance, and the process can reduce the tensile strength of the final product, so that the performance of the material cannot be well exerted.
Disclosure of Invention
The invention aims to solve the technical problems that: in order to overcome the defects in the prior art, the invention provides a processing method for improving the wiredrawing strength of the copper alloy so as to obviously improve the breakage rate of the copper alloy.
The technical scheme adopted for solving the technical problems is as follows: a processing method for improving the wiredrawing strength of copper alloy comprises the following steps:
(1) Annealing and heat-treating the copper alloy wire blank;
(2) Cold pressing the annealed copper alloy wire blank, wherein the aspect ratio of the cold pressed copper alloy wire blank is 1.5-2.5;
(3) And drawing the cold-pressed wire blank by adopting a circular die hole.
Preferably, the diameter of the copper alloy wire blank in the step (1) ranges from 2.0 mm to 3.0mm.
Further, the annealing mode of the copper alloy wire blank in the step (1) can adopt vacuum annealing, inert protective atmosphere annealing such as argon or nitrogen and the like, hydrogen or carbon monoxide reducing atmosphere annealing, and the elongation percentage of the annealed copper alloy wire blank is more than or equal to 20 percent.
Specifically, the length after cold pressing in the step (2) refers to the maximum distance between two non-cold-pressed cambered surfaces in the copper alloy wire blank, and the width after cold pressing refers to the minimum distance between two cold-pressed surfaces in the copper alloy wire blank.
Preferably, during the wire drawing in the step (3), the first die is matched with the die according to the maximum distance between the two non-cold-pressed cambered surfaces; during wire drawing, flat wires formed by two cold pressing surfaces of the round die Kong Duixian blank are subjected to wire drawing, and the diameter of the wire after the wire drawing is not more than 0.05mm.
The beneficial effects of the invention are as follows: according to the invention, aiming at the evolution process of crystal grains and a tissue structure in the processing process of the copper alloy wire micro-filament, the research discovers that in the deformation process of the copper alloy wire, the crystal grains on the surface of the copper alloy wire begin to deform first and then gradually develop to the subsurface, so that the deformation of the copper alloy wire is realized in advance under the condition of larger wire diameter of the wire, the tissue state of the round inner part of the wire, which is uniform and consistent outwards along the center, is changed, and finally the aim of the cooperative deformation of the surface and the inner part of the material in the wire drawing processing process is realized, thereby achieving the aims of improving the elongation and the strength of the wire and reducing the breakage rate in the processing process.
Drawings
The invention will be further described with reference to the drawings and examples.
Fig. 1 is a TEM bright field image of the interior of a copper alloy wire processed in accordance with the present invention.
Detailed Description
Example 1:
10kg of copper-silver alloy wire blank with the silver content of 2% and the wire diameter of 2.6mm is selected and processed.
(1) Vacuum annealing the copper alloy to a vacuum degree of 2.0X10 -2 Pa, elongation after annealing is 31%;
(2) Cold-pressing the annealed copper alloy wire blank to form a flat wire, wherein the aspect ratio of the flat wire after cold pressing is 1.6, and the maximum distance between two non-cold-pressed cambered surfaces of the flat wire is 3.2mm;
(3) And carrying out wiredrawing processing on the copper alloy wire blank flat wire, wherein a first die is matched with a die according to the maximum size of 3.2mm of the flat wire, and a copper alloy superfine wire with the size of 0.041mm is obtained after wiredrawing processing, wherein 10kg of copper-silver alloy adopted in the wiredrawing process does not have wire breakage in the wiredrawing process.
Comparative example 1
To better demonstrate the advantages of the processing method of the present invention, a comparative example was made for this alloy: 10kg of copper-silver alloy wire stock with silver content of 2% and wire diameter of 2.6mm was subjected to direct wire drawing processing, the alloy wire stock was drawn to 0.041mm, and in the comparative example of 10kg of the batch, the wire was broken 1 time and 2 times, namely, 3 times in total, at 0.056 and 0.045, respectively.
Example 2
20kg of copper-tin alloy wire blank with the tin content of 0.6% and the wire diameter of 2.1mm is selected and processed.
(1) Argon protection annealing is carried out on the copper alloy, and the elongation percentage after annealing is 26%;
(2) Cold-pressing the annealed copper alloy wire blank to form a flat wire, wherein the aspect ratio of the flat wire after cold pressing is 2.0, and the maximum distance between two non-cold-pressed cambered surfaces of the flat wire is 3.5mm;
(3) And carrying out wiredrawing processing on the copper alloy wire blank flat wire, wherein a first die is matched with a die according to the maximum size of 3.5mm of the flat wire, and a copper alloy superfine wire with the size of 0.022mm is obtained after wiredrawing processing, wherein 20kg of copper-tin alloy adopted in the wiredrawing process does not have wire breakage in the wiredrawing process.
Comparative example 2
To better demonstrate the advantages of the method of the present invention, a comparative example was made for this alloy. 20kg of copper-tin alloy wire stock with tin content of 0.6% and wire diameter of 2.1mm was subjected to direct wire drawing processing, the alloy wire stock was drawn to 0.022mm, and in the comparative example of 20kg of the batch, the wire was broken 1 time and 1 time, namely, 2 times in total, at 0.056 and 0.036, respectively.
Example 3
10kg of copper-magnesium alloy wire blank with the magnesium content of 0.4% and the wire diameter of 3.0mm is selected and processed.
(1) Annealing the copper alloy in an ammonia decomposing furnace, wherein the elongation after annealing is 22%;
(2) Cold-pressing the annealed copper alloy wire blank to form a flat wire, wherein the aspect ratio of the flat wire after cold pressing is 2.2, and the maximum distance between two non-cold-pressed cambered surfaces of the flat wire is 3.8mm;
(3) And carrying out wiredrawing processing on the copper alloy wire blank flat wire, wherein a first die is matched with a die according to the maximum size of 3.8mm of the flat wire, and a copper alloy superfine wire with the size of 0.031mm is obtained after wiredrawing processing, wherein the condition that 10kg of copper-magnesium alloy adopted in the wiredrawing process is broken in the wiredrawing process for 1 time is positioned at the position of 0.036 mm.
Comparative example 3
To better demonstrate the advantages of the method of the present invention, a comparative example was made for this alloy. 10kg of copper-magnesium alloy wire blank with the magnesium content of 0.4 percent and the wire diameter of 2.1mm. The copper alloy was subjected to direct wire drawing, and the alloy wire blank was drawn to 0.031mm. In the 10kg comparative example of this batch, the breaks were 1, 2 and 1, i.e. 4 times together, at 0.041, 0.036 and 0.031, respectively.
Fig. 1 is a TEM bright field image of the interior of a copper alloy wire processed by the present method, and with the non-uniform processing of the present invention, it can be seen that deformation is achieved in the interior of the wire and a large amount of shear twins are generated, the generation of which improves the strength of the material.
Table 1 is a table showing the wire strength and the number of wire breakage obtained in the above examples and comparative examples.
TABLE 1
| strength/MPa | Number of wire breaks/time | |
| Example 1 | 1097 | 0 |
| Comparative example 1 | 1014 | 3 |
| Example 2 | 847 | 0 |
| Comparative example 2 | 816 | 2 |
| Example 3 | 765 | 1 |
| Comparative example 3 | 739 | 4 |
The processing advantages resulting from the process of the present invention are evident from the data in Table 1.
With the above-described preferred embodiments according to the present invention as an illustration, the above-described descriptions can be used by persons skilled in the relevant art to make various changes and modifications without departing from the scope of the technical idea of the present invention. The technical scope of the present invention is not limited to the description, but must be determined according to the scope of claims.
Claims (1)
1. A processing method for improving the wiredrawing strength of copper alloy is characterized by comprising the following steps: the method comprises the following steps:
(1) Annealing heat treatment is carried out on the copper alloy wire blank, wherein the diameter range of the copper alloy wire blank is 2.0-3.0 mm; the annealing mode of the copper alloy wire blank can adopt vacuum annealing, atmosphere protection annealing or reducing atmosphere annealing, and the elongation percentage of the annealed copper alloy wire blank is more than or equal to 20%;
(2) Cold pressing the annealed copper alloy wire blank, wherein the aspect ratio of the cold pressed copper alloy wire blank is 1.5-2.5; the length after cold pressing refers to the maximum distance between two non-cold-pressed cambered surfaces in the copper alloy wire blank, and the width after cold pressing refers to the minimum distance between two cold-pressed surfaces in the copper alloy wire blank;
(3) And drawing the cold-pressed wire blank by adopting a circular die hole, wherein during drawing, the first die is matched with the die according to the maximum distance between two non-cold-pressed cambered surfaces, and the diameter of the wire rod subjected to the drawing of the circular die hole is not more than 0.05mm.
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| CN202110829456.9A CN113560365B (en) | 2021-07-22 | 2021-07-22 | Processing method for improving wiredrawing strength of copper alloy |
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| CN202110829456.9A CN113560365B (en) | 2021-07-22 | 2021-07-22 | Processing method for improving wiredrawing strength of copper alloy |
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| CN113560365B true CN113560365B (en) | 2023-08-15 |
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