CN108465787B - Manufacturing process of chromium bronze conducting bar of asynchronous traction motor rotor - Google Patents
Manufacturing process of chromium bronze conducting bar of asynchronous traction motor rotor Download PDFInfo
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Abstract
The invention discloses a manufacturing process of a chromium bronze guide bar of an asynchronous traction motor rotor, belongs to the technical field of motor guide bar preparation, and particularly relates to a chromium bronze material up-drawing continuous casting technology and a chromium bronze material continuous extrusion technology. The method comprises the steps of preparing a chromium bronze copper rod by adopting an upward continuous casting technology, continuously extruding the upward continuous casting copper rod to obtain a conducting bar extruded section, carrying out drawing cold deformation on the extruded conducting bar section, carrying out aging treatment, and processing to obtain the rotor conducting bar. Compared with the traditional manufacturing method of the chromium bronze conducting bar of the asynchronous traction motor rotor, the manufacturing method has the advantages of excellent conducting bar production performance, stable quality, continuous operation, improvement of material utilization and the like, and can realize large-scale production.
Description
Technical Field
The invention relates to the technical field of motor conducting bar preparation, in particular to a manufacturing process of a chromium bronze conducting bar of an asynchronous traction motor rotor.
Background
In recent years, rail transit is rapidly developed, an alternating current transmission technology is rapidly developed, and the application of an asynchronous traction motor is wider. The asynchronous motor has the characteristics of simple structure, reliable components, excellent electromagnetic performance and the like, and is suitable for electric locomotives, motor cars, diesel locomotives and the like. The motor rotor is a core component of an asynchronous traction motor, and converts electric energy into kinetic energy through electromagnetic action so as to provide power for the whole locomotive (high-speed rail, subway and the like). The chromium bronze rotor guide bar is used as an important component of an asynchronous traction motor rotor, and has become a main material of the guide bar of the rail transit traction motor due to good electrical conductivity, thermal conductivity and high strength of the material.
The raw material preparation of most of the existing manufacturers adopts general semi-continuous casting, so that the production efficiency is low and the material utilization rate is low; the section bar is obtained by a hot extrusion process, and the mechanical property and the consistency of a metallographic structure of the manufactured conducting bar are poor due to the uneven deformation in the hot extrusion process, so that the energy consumption in the production process is high; the surface quality of the section after hot extrusion is unstable, the defects of surface inclusion, peeling, extrusion embossing and the like are many, the treatment process is complex, and the product quality is influenced. In addition, the tail part of the section produced by the hot extrusion method inevitably generates the defect of extruding and compressing the tail, and the defect can only be reduced as much as possible by the process and can not be thoroughly solved. The existence of the tail-shrinking defect destroys the compactness and continuity of the material and seriously affects the performance of the material, and the tail-shrinking defect is generally removed by naked eye and ultrasonic flaw detection. However, due to the fact that defects are irregular and unstable, detection blind areas exist, unidentified risks exist, pressing cannot be conducted in subsequent processing, products have certain quality risks, and economic losses can be brought to subsequent enterprises.
Disclosure of Invention
Aiming at the problems, the manufacturing process of the chromium bronze conducting bar of the asynchronous traction motor rotor is further provided.
The technical scheme of the invention is as follows: a manufacturing process of a chromium bronze conducting bar of an asynchronous traction motor rotor comprises the following steps:
(1) preparing an upward copper rod: obtaining a chromium bronze rod by adopting an upward continuous casting technology, and performing upward continuous casting on a horizontal vertical continuous casting machine to finally obtain an upward cast chromium bronze rod;
(2) continuous extrusion: placing the up-drawn cast chromium bronze rod on a copper continuous extruder for continuous extrusion, starting up normally, and after waiting for the normal operation of the whole line, slowly increasing the rotation speed of a main shaft to keep the extrusion temperature at 500-700 ℃, and controlling the range of the rated rotation speed at 5-15r/MP to obtain a chromium bronze alloy guide bar profile;
(3) cold drawing: drawing the obtained chromium bronze alloy guide bar sectional material for multiple times, wherein the drawing adopts a cold drawing process, so that the chromium bronze alloy guide bar sectional material is subjected to multiple cold deformation to obtain the final section size of the chromium bronze alloy guide bar sectional material;
(4) cutting by fixed length: carrying out fixed-length sawing on the chromium bronze alloy guide bar sectional material subjected to cold drawing treatment to finally obtain a chromium bronze alloy guide bar sectional material with a fixed size;
(5) and (3) heat treatment: carrying out aging heat treatment on the cut chromium bronze alloy guide bar section bar by a fixed length saw, wherein the aging heat treatment has the following process parameters: the heat preservation temperature is 400-; obtaining a chromium bronze alloy guide bar after aging heat treatment;
(6) machining: and machining the chromium bronze alloy conducting bar subjected to heat treatment to obtain the chromium bronze alloy conducting bar meeting the final dimensional tolerance requirement of the product.
Further, the working method of the row vertical casting machine in the step (1) comprises the following steps: continuously adding raw materials used for upward casting into an induction heating furnace through a coil, wherein the temperature in the induction heating furnace is 1100-1500 ℃, continuously sucking molten metal in the induction heating furnace through a vertical casting machine, wherein the adjustment range of the upward casting speed is 500-1500mm/min, the upward casting speed cannot be too fast and is not easy to be too slow, the product quality can be reduced due to the too fast upward casting speed, and the production efficiency can be reduced due to the too slow upward casting speed.
Further, the extrusion ratio of the continuous extrusion process in the step (2) is 6-10, and excessive extrusion ratio can cause the chromium bronze alloy conducting bar to be broken and scrapped, so that the purpose of continuous extrusion cannot be achieved.
Further, the cold drawing process parameters in the step (3) are as follows: the cold drawing times are 3-5 times, the cold drawing speed is 80-100mm/s, the cold deformation amount of single cold drawing is 5% -10%, the accumulated cold deformation amount is controlled to be 15% -30%, and experiments prove that when the accumulated cold deformation amount exceeds 30%, the internal structure of the chromium bronze alloy guide bar can generate an uneven phenomenon, so that the accumulated cold deformation amount is controlled to be below 30%.
Further, the fixed length sawing in the step (4) is as follows: firstly, the chromium bronze alloy conducting bar is sized according to a conducting bar length standard and a section standard given by a user, the section shape of the conducting bar is rectangular, trapezoidal and circular, then the chromium bronze alloy conducting bar is sawed off by adopting a milling processing mode, cooling liquid cooling is carried out during the processing process, the temperature of the conducting bar processing technology is kept at 20-25 ℃, cooling liquid cooling is carried out during the sawing process, and the influence on the quality of the chromium bronze alloy conducting bar caused by overhigh processing temperature is prevented.
Further, the cooling speed of the aging heat treatment in the step (5) is 1-2 ℃/min, the conductivity of the guide bar is detected according to 100% of sampling force on the chromium bronze alloy guide bar subjected to the aging heat treatment, the strength, the hardness and the metallographic structure of the guide bar are detected according to 1% of sampling force, the guide bar which does not meet the requirements of users is directly scrapped, the sampling inspection in the production process is important, waste products are timely eliminated, problems are timely found, and the improvement of the production efficiency and the qualification rate of products is facilitated.
Further, an antioxidant is coated on the chromium bronze alloy conducting bar obtained after the machining in the step (6), so that the influence on the quality of the chromium bronze alloy conducting bar caused by the surface oxidation of the chromium bronze alloy conducting bar is prevented.
Still further, the antioxidant comprises by weight percent: 10 to 15 percent of hydroxyethyl cellulose ether, 5 to 10 percent of clay with frog meshes, 10 to 15 percent of polyethoxy fatty alcohol, 9 to 13 percent of high-temperature glass powder, 5 to 10 percent of polyacrylamide, 10 to 20 percent of butter and the balance of triethanolamine oleate.
The invention has the beneficial effects that:
1. preparing raw materials: the continuous casting technology is introduced, the difficult problem of up-drawing continuous casting of the chromium bronze material is solved, the required chromium bronze up-drawing copper rod is obtained, the continuous production is realized, the production efficiency is improved, and the material utilization rate is improved;
2. the sectional material is prepared, a continuous extrusion technology is introduced, the problem of continuous extrusion of the chromium bronze material is solved, the required chromium bronze continuous extrusion sectional material is obtained, and continuous production is realized. The profile prepared by the method has smooth and bright surface, no defects of impurities, peeling and the like, and no tail shrinkage defect, so that the problem of the internal quality of the product is thoroughly solved;
the method has the advantages of uniform material deformation, uniform mechanical property and metallographic structure of the manufactured conducting bar and stable quality. The energy consumption in the production process is low.
In a word, the mechanical property, the metallographic structure, the material utilization rate, the industrialization and the like of the conducting bar manufactured by the method are further improved.
Detailed Description
Example 1:
a manufacturing process of a chromium bronze conducting bar of an asynchronous traction motor rotor comprises the following steps:
(1) preparing an upward copper rod: adopting an upward continuous casting technology to obtain a chromium bronze rod, and performing upward continuous casting on a horizontal vertical continuous casting machine, wherein the working method of the horizontal vertical casting machine comprises the following steps: continuously adding the molten metal which is melted into the induction heating furnace, keeping the temperature in the induction heating furnace between 1100 ℃ and 1500 ℃, continuously sucking the molten metal in the induction heating furnace through a vertical casting machine, and adjusting the upward drawing speed within the range of 500-. The efficiency of casting the chromium bronze rod by adopting a continuous upward casting technology is high, the efficiency is influenced by too small upward casting speed, the quality is influenced by too high upward casting speed, and finally the upward cast chromium bronze rod is obtained;
(2) continuous extrusion: placing the up-drawn cast chromium bronze rod on a copper continuous extruder for continuous extrusion, starting up normally, slowly increasing the rotating speed of a main shaft after waiting for normal operation of the whole line, keeping the extrusion temperature at 500 ℃, controlling the rated rotating speed range at 5r/MP, and controlling the extrusion ratio of the continuous extrusion process to be 6, wherein the quality of the metal surface is easily damaged when the extrusion ratio is too large, so that the chromium bronze alloy guide bar profile is obtained;
(3) cold drawing: the obtained chromium bronze alloy guide bar section is subjected to multi-pass drawing, the drawing adopts a cold drawing process, and the cold drawing process parameters are as follows: the cold drawing frequency is 3 times, the cold drawing speed is 80mm/s, the cold deformation amount of single cold drawing is 5%, the accumulated cold deformation amount is controlled to be 15%, the accumulated cold deformation amount is not easy to be too large and is easy to break, and the final section size of the chromium bronze alloy guide bar profile is obtained after the chromium bronze alloy guide bar profile is subjected to multiple cold deformation;
(4) cutting by fixed length: the method comprises the steps of carrying out fixed-length sawing on a chromium bronze alloy guide bar profile subjected to cold drawing processing, firstly carrying out fixed-length sawing on the chromium bronze alloy guide bar according to a guide bar length standard and a guide bar cross section standard given by a user, wherein the guide bar cross section is rectangular, then sawing the chromium bronze alloy guide bar by adopting a milling processing mode, simultaneously carrying out cooling liquid cooling in the processing process, keeping the processing temperature of the guide bar at 20 ℃, carrying out cooling liquid cooling in the sawing process, preventing the quality of the chromium bronze alloy guide bar from being influenced by overhigh processing temperature, and finally obtaining the chromium bronze alloy guide bar profile with fixed size.
(5) And (3) heat treatment: carrying out aging heat treatment on the cut chromium bronze alloy guide bar section bar by a fixed length saw, wherein the aging heat treatment has the following process parameters: the heat preservation temperature is 400 ℃, the heat preservation time is 2 hours, the cooling speed of the aging heat treatment is 1 ℃/min, the conductivity of the guide bar is detected according to 100% of sampling inspection force on the chromium bronze alloy guide bar subjected to the aging heat treatment, the strength, the hardness and the metallographic structure of the guide bar are detected according to 1% of sampling inspection force, the guide bar which does not meet the requirements of users is directly scrapped, the sampling inspection in the production process is important, waste products are timely eliminated, problems are timely discovered, the production efficiency and the qualification rate of products are favorably improved, the quality of the guide bar is controlled in the process, the chromium bronze alloy guide bar subjected to the aging heat treatment is obtained, and finally the qualified chromium bronze alloy guide bar subjected to the aging heat treatment is obtained;
(6) machining: machining the chromium bronze alloy conducting bar subjected to heat treatment to obtain the chromium bronze alloy conducting bar meeting the final dimensional tolerance requirement of a product, coating an antioxidant on the obtained chromium bronze alloy conducting bar to prevent the surface oxidation of the chromium bronze alloy conducting bar from influencing the quality of the chromium bronze alloy conducting bar, wherein the antioxidant comprises the following components in percentage by weight: 10% of hydroxyethyl cellulose ether, 5% of clay of Rana Nigromaculata, 10% of polyethoxy fatty alcohol, 9% of high-temperature glass powder, 5% of polyacrylamide, 10% of butter and the balance of gasoline.
Example 2:
a manufacturing process of a chromium bronze conducting bar of an asynchronous traction motor rotor comprises the following steps:
(1) preparing an upward copper rod: adopting an upward continuous casting technology to obtain a chromium bronze rod, and performing upward continuous casting on a horizontal vertical continuous casting machine, wherein the working method of the horizontal vertical casting machine comprises the following steps: continuously adding the molten metal which is molten into an induction heating furnace, keeping the temperature in the induction heating furnace between 1400 ℃, continuously sucking the molten metal in the induction heating furnace through a vertical casting machine, wherein the adjustment range of the upward drawing speed is 1000mm/min, the efficiency is influenced by the fact that the chromium bronze rod is cast by adopting a continuous upward drawing technology, the quality is influenced by the fact that the upward drawing speed is too high, and finally the upward-drawn cast chromium bronze rod is obtained;
(2) continuous extrusion: placing the up-drawn cast chromium bronze rod on a copper continuous extruder for continuous extrusion, starting up normally, slowly increasing the rotating speed of a main shaft after waiting for normal operation of the whole line, keeping the extrusion temperature at 600 ℃, controlling the range of rated rotating speed at 5-15r/MP, controlling the extrusion ratio of the continuous extrusion process to be 8, and easily damaging the surface quality of metal when the extrusion ratio is too large to obtain a chromium bronze alloy guide bar profile;
(3) cold drawing: the obtained chromium bronze alloy guide bar section is subjected to multi-pass drawing, the drawing adopts a cold drawing process, and the cold drawing process parameters are as follows: the cold drawing frequency is 4 times, the cold drawing speed is 90mm/s, the cold deformation amount of single cold drawing is 7%, the accumulated cold deformation amount is controlled to be 28%, the accumulated cold deformation amount is not easy to be too large and is easy to break, and the final section size of the chromium bronze alloy guide bar profile is obtained after the chromium bronze alloy guide bar profile is subjected to multiple cold deformation;
(4) cutting by fixed length: the method comprises the steps of carrying out fixed-length sawing on a chromium bronze alloy guide bar profile subjected to cold drawing processing, firstly carrying out fixed-length sawing on the chromium bronze alloy guide bar according to a guide bar length standard and a guide bar cross section standard given by a user, wherein the guide bar cross section is trapezoidal, then sawing the chromium bronze alloy guide bar by adopting a milling processing mode, simultaneously carrying out cooling liquid cooling in the processing process, keeping the guide bar processing process temperature at 23 ℃, carrying out cooling liquid cooling in the sawing process, preventing the quality of the chromium bronze alloy guide bar from being influenced by overhigh processing temperature, and finally obtaining the chromium bronze alloy guide bar profile with fixed size.
(5) And (3) heat treatment: carrying out aging heat treatment on the cut chromium bronze alloy guide bar section bar by a fixed length saw, wherein the aging heat treatment has the following process parameters: the heat preservation temperature is 450 ℃, the heat preservation time is 4 hours, the cooling speed of the aging heat treatment is 1.5 ℃/min, the conductivity of the guide bar is detected according to 100% of sampling force of the chromium bronze alloy guide bar subjected to the aging heat treatment, the strength, the hardness and the metallographic structure of the guide bar are detected according to 1% of sampling force, the guide bar which does not meet the requirements of users is directly scrapped, the sampling inspection in the production process is important, waste products are timely eliminated, problems are timely discovered, the production efficiency and the qualification rate of products are favorably improved, and finally the qualified chromium bronze alloy guide bar subjected to the aging heat treatment is obtained.
(6) Machining: machining the chromium bronze alloy conducting bar subjected to heat treatment to obtain the chromium bronze alloy conducting bar meeting the final dimensional tolerance requirement of a product, coating an antioxidant on the obtained chromium bronze alloy conducting bar to prevent the surface oxidation of the chromium bronze alloy conducting bar from influencing the quality of the chromium bronze alloy conducting bar, wherein the antioxidant comprises the following components in percentage by weight: 12% of hydroxyethyl cellulose ether, 8% of clay of Rana Nigromaculata, 12% of polyethoxy fatty alcohol, 10% of high-temperature glass powder, 8% of polyacrylamide, 15% of butter and the balance of triethanolamine oleate.
Example 3:
a manufacturing process of a chromium bronze conducting bar of an asynchronous traction motor rotor comprises the following steps:
(1) preparing an upward copper rod: adopting an upward continuous casting technology to obtain a chromium bronze rod, and performing upward continuous casting on a horizontal vertical continuous casting machine, wherein the working method of the horizontal vertical casting machine comprises the following steps: continuously adding the molten metal which is molten into an induction heating furnace, keeping the temperature in the induction heating furnace between 1500 ℃, continuously sucking the molten metal in the induction heating furnace through a vertical casting machine, wherein the adjustment range of the upward drawing speed is 1500mm/min, the efficiency is influenced by the fact that the chromium bronze rod is cast by adopting a continuous upward drawing technology, the quality is influenced by the fact that the upward drawing speed is too high, and finally the upward-drawn cast chromium bronze rod is obtained;
(2) continuous extrusion: placing the up-drawn cast chromium bronze rod on a copper continuous extruder for continuous extrusion, starting up normally, slowly increasing the rotating speed of a main shaft after waiting for normal operation of the whole line, keeping the extrusion temperature at 700 ℃, controlling the rated rotating speed range at 15r/MP, wherein the extrusion ratio of the continuous extrusion process is 10, and the quality of the metal surface is easily damaged when the extrusion ratio is too large, so that the chromium bronze alloy guide bar profile is obtained;
(3) cold drawing: the obtained chromium bronze alloy guide bar section is subjected to multi-pass drawing, the drawing adopts a cold drawing process, and the cold drawing process parameters are as follows: the cold drawing frequency is 5 times, the cold drawing speed is 100mm/s, the cold deformation amount of single cold drawing is 6%, the accumulated cold deformation amount is controlled to be 30%, the accumulated cold deformation amount is not easy to be too large and is easy to break, and the final section size of the chromium bronze alloy guide bar profile is obtained after the chromium bronze alloy guide bar profile is subjected to multiple cold deformation;
(4) cutting by fixed length: the method comprises the steps of carrying out fixed-length sawing on a chromium bronze alloy guide bar profile subjected to cold drawing processing, firstly carrying out fixed-length sawing on the chromium bronze alloy guide bar according to a guide bar length standard and a guide bar cross section standard given by a user, wherein the guide bar cross section is circular, then sawing the chromium bronze alloy guide bar by adopting a milling processing mode, simultaneously carrying out cooling liquid cooling in the processing process, keeping the processing temperature of the guide bar at 25 ℃, carrying out cooling liquid cooling in the sawing process, preventing the quality of the chromium bronze alloy guide bar from being influenced by overhigh processing temperature, and finally obtaining the chromium bronze alloy guide bar profile with fixed size.
(5) And (3) heat treatment: carrying out aging heat treatment on the cut chromium bronze alloy guide bar section bar by a fixed length saw, wherein the aging heat treatment has the following process parameters: the heat preservation temperature is 500 ℃, the heat preservation time is 6 hours, the cooling speed of the aging heat treatment is 2 ℃/min, the conductivity of the guide bar is detected according to 100% of sampling force on the chromium bronze alloy guide bar subjected to the aging heat treatment, the strength, the hardness and the metallographic structure of the guide bar are detected according to 1% of sampling force, the guide bar which does not meet the requirements of users is directly scrapped, the sampling inspection in the production process is important, waste products are timely removed, problems are timely discovered, and the improvement of the production efficiency and the qualification rate of products is facilitated.
(6) Machining: machining the chromium bronze alloy conducting bar subjected to heat treatment to obtain the chromium bronze alloy conducting bar meeting the final dimensional tolerance requirement of a product, coating an antioxidant on the obtained chromium bronze alloy conducting bar to prevent the surface oxidation of the chromium bronze alloy conducting bar from influencing the quality of the chromium bronze alloy conducting bar, wherein the antioxidant comprises the following components in percentage by weight: 15% of hydroxyethyl cellulose ether, 10% of clay of Rana Nigromaculata, 15% of polyethoxy fatty alcohol, 13% of high-temperature glass powder, 10% of polyacrylamide, 20% of butter and the balance of triethanolamine oleate.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (1)
1. The manufacturing process of the chromium bronze conducting bar of the asynchronous traction motor rotor is characterized by comprising the following steps of:
(1) preparing an upward copper rod: obtaining a chromium bronze rod by adopting an upward continuous casting technology, and performing upward continuous casting on a vertical continuous casting machine to finally obtain an upward cast chromium bronze rod;
(2) continuous extrusion: placing the up-drawn cast chromium bronze rod on a copper continuous extruder for continuous extrusion, starting up normally, and after waiting for the normal operation of the whole line, slowly increasing the rotation speed of a main shaft to keep the extrusion temperature at 500-700 ℃, and controlling the range of the rated rotation speed at 5-15r/MP to obtain a chromium bronze alloy guide bar profile;
(3) cold drawing: drawing the obtained chromium bronze alloy guide bar sectional material for multiple times, wherein the drawing adopts a cold drawing process, so that the chromium bronze alloy guide bar sectional material is subjected to multiple cold deformation to obtain the final section size of the chromium bronze alloy guide bar sectional material;
(4) cutting by fixed length: carrying out fixed-length sawing on the chromium bronze alloy guide bar sectional material subjected to cold drawing treatment to finally obtain a chromium bronze alloy guide bar sectional material with a fixed size;
(5) and (3) heat treatment: carrying out aging heat treatment on the cut chromium bronze alloy guide bar section bar by a fixed length saw, wherein the aging heat treatment has the following process parameters: the heat preservation temperature is 400-; obtaining a chromium bronze alloy guide bar after aging heat treatment;
(6) machining: machining the chromium bronze alloy conducting bar subjected to heat treatment to obtain the chromium bronze alloy conducting bar meeting the final dimensional tolerance requirement of a product;
the working method of the vertical casting machine in the step (1) comprises the following steps: continuously adding the raw materials used for upward casting into an induction heating furnace through a coil, wherein the temperature in the induction heating furnace is 1100-1500 ℃, continuously sucking the molten metal in the induction heating furnace through a vertical casting machine, and adjusting the upward casting speed within the range of 500-1500 mm/min;
the extrusion ratio of the continuous extrusion process in the step (2) is 6-10;
the cold drawing process parameters in the step (3) are as follows: the cold drawing times are 3-5 times, the cold drawing speed is 80-100mm/s, the cold deformation amount of single cold drawing is 5% -10%, and the accumulated cold deformation amount is controlled to be 15% -30%;
the fixed length sawing in the step (4) is as follows: firstly, sizing a chromium bronze alloy conducting bar according to a conducting bar length standard and a section standard given by a user, wherein the section of the conducting bar is rectangular, trapezoidal or circular, then sawing off the chromium bronze alloy conducting bar by adopting a milling processing mode, cooling by using cooling liquid during the processing process, and keeping the processing process temperature of the conducting bar at 20-25 ℃;
the cooling speed of the aging heat treatment in the step (5) is 1-2 ℃/min, the conductivity of the guide bar is detected according to 100% of sampling force on the chromium bronze alloy guide bar subjected to the aging heat treatment, the strength, the hardness and the metallographic structure of the guide bar are detected according to 1% of sampling force, and the guide bar which does not meet the requirements of users is directly scrapped;
and (4) coating an antioxidant on the chromium bronze alloy conducting bar obtained after the machining in the step (6).
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| CN107739872A (en) * | 2017-09-29 | 2018-02-27 | 常州安凯特电缆有限公司 | A kind of Cu-Cr-Zr alloy contact line and its production technology |
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| JPS58107460A (en) * | 1981-12-21 | 1983-06-27 | Chuetsu Gokin Chuko Kk | Mold material for precipitation hardening type continuous casting |
| CN101710505A (en) * | 2009-12-14 | 2010-05-19 | 中铁建电气化局集团有限公司 | Method for preparing copper magnesium alloy contact wire |
| CN103088228A (en) * | 2012-09-29 | 2013-05-08 | 浙江天河铜业股份有限公司 | Production method of high-strength high-conductivity copper alloy stranded wire |
| CN104032245A (en) * | 2014-06-06 | 2014-09-10 | 中国科学院金属研究所 | A production technology of an ultrafine-grained high-performance CuCrNiSi alloy slot wedge |
| CN106180617A (en) * | 2016-08-11 | 2016-12-07 | 泰兴市圣达铜业有限公司 | A kind of continuous extrausion process produces the processing technique of silver-bearing copper damping slot wedge |
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| CN106676318A (en) * | 2016-12-16 | 2017-05-17 | 陕西斯瑞新材料股份有限公司 | Zirconium-containing brass material for asynchronous traction motor rotor conducting bar and preparation method of zirconium-containing brass material |
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| CN107739872A (en) * | 2017-09-29 | 2018-02-27 | 常州安凯特电缆有限公司 | A kind of Cu-Cr-Zr alloy contact line and its production technology |
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