CN112058939A - Red copper tensile member forming process - Google Patents
Red copper tensile member forming process Download PDFInfo
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- CN112058939A CN112058939A CN202010878739.8A CN202010878739A CN112058939A CN 112058939 A CN112058939 A CN 112058939A CN 202010878739 A CN202010878739 A CN 202010878739A CN 112058939 A CN112058939 A CN 112058939A
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- annealing
- red copper
- copper
- forming process
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Classifications
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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
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0239—Lubricating
- B21B45/0242—Lubricants
-
- 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
- B21C1/00—Manufacture of metal sheets, metal wire, metal rods, metal tubes by drawing
- B21C1/16—Metal drawing by machines or apparatus in which the drawing action is effected by other means than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, bars, or tubes
- B21C1/22—Metal drawing by machines or apparatus in which the drawing action is effected by other means than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, bars, or tubes specially adapted for making tubular articles
-
- 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
- B21C23/00—Extruding metal; Impact extrusion
- B21C23/02—Making uncoated products
- B21C23/04—Making uncoated products by direct extrusion
- B21C23/08—Making wire, bars, tubes
-
- 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
- B21C31/00—Control devices, e.g. for regulating the pressing speed or temperature of metal; Measuring devices, e.g. for temperature of metal, combined with or specially adapted for use in connection with extrusion presses
-
- 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
- B21C9/00—Cooling, heating or lubricating drawing material
- B21C9/02—Selection of compositions therefor
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
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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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Metal Extraction Processes (AREA)
Abstract
The invention relates to the technical field of red copper, in particular to a red copper tensile member forming process, which comprises the following steps of S1: preparing a copper ingot meeting the requirements; s2, extruding the copper ingot in the step S1 into a round pipe by adopting an 800-ton horizontal extruder; s3, rolling the round pipe in the step S2 by adopting an LG30 pipe rolling mill; s4, annealing the round tube rolled in the step S3; s5, stretching the round tube annealed in the step S4 by a disc stretcher; s6, annealing the round tube which is stretched in the step S5 again; s7, checking the round tube annealed in the step S6, and screening out unqualified defective products to obtain a finished product tube. The production process of the red copper hollow tube is feasible by adopting the modes of ingot casting → extrusion → tube rolling → annealing → stretching → annealing.
Description
Technical Field
The invention relates to the technical field of red copper, in particular to a red copper tensile member forming process.
Background
The red copper is relatively pure copper, can be generally considered as pure copper approximately, has good conductivity and plasticity, but has poor strength and hardness. The red copper has good conductive performance, so the red copper is widely applied to the electronic industry. With the high-speed development of the energy industry in China, a large number of red copper hollow pipes are needed in domestic large motor plants for manufacturing the stator coils of the generators. In the 20 th century, a large amount of the product is imported from foreign countries, and with the success of product tests, the production of the red copper hollow tube is localized at present.
The red copper hollow tube has high quality requirement, especially the requirements of inner and outer surface roughness, R angle, dimensional tolerance, grain size and the like, and the common method can not meet the requirements for producing smaller tubes, so the invention designs a red copper stretch forming process.
Disclosure of Invention
In order to solve the technical problems, the invention provides a red copper stretch forming process.
The invention provides the following technical scheme: the red copper stretch forming process is characterized by comprising the following steps:
s1, preparing raw materials: preparing copper ingots which meet the preparation requirements;
s2, extruding the copper ingot in the step S1 into a round pipe by adopting an 800-ton horizontal extruder;
s3, rolling the round pipe in the step S2 by adopting an LG30 pipe rolling mill;
s4, annealing the round tube rolled in the step S3;
s5, stretching the round tube annealed in the step S4 by a disc stretcher;
s6, annealing the round tube which is stretched in the step S5 again;
s7, checking the round tube annealed in the step S6, and screening out unqualified defective products to obtain a finished product tube.
Preferably, the copper ingot in step S1 has a smooth surface, and is free of cracks, delamination, inclusions, scaling, and scale.
Preferably, the parameters of the 800-ton horizontal extruder are set to be 800 ℃ of heating temperature, 13 degrees of drawing die angle and 10.5 degrees of core ball angle.
Preferably, the annealing treatment parameters in the step S4 are set to be the annealing temperature of 260-280 ℃ and the heat preservation time of 40-60 min.
Preferably, in step S5, the parameters of the disc stretcher are set to have a die angle of 15 ° and a core ball angle of 10.5 °.
Preferably, the annealing temperature in the step S6 is 260-280 ℃ and the heat preservation time is 40-60 min.
Preferably, vegetable oil and emulsion are selected as the lubricant in the rolling process in step S3.
The invention relates to a red copper stretch forming process, which has the beneficial effects that: the production process of the red copper hollow tube is feasible by adopting the modes of ingot casting → extrusion → tube rolling → annealing → stretching → annealing. The extrusion and rolling process is a process stage for manufacturing products, and qualified blanks are provided according to requirements; the moving core ball is adopted for stretching, the processing rate is controlled between 25 percent and 35 percent, and the disc supply of products can be realized.
(2) By adding intermediate softening annealing at 280-320 ℃/40-60 min, the processing hardening is eliminated, the plasticity is improved, the continuous deformation is easy, and the surface quality of the product is good; the finished product can meet the requirements of various technical indexes of the red copper hollow pipe by annealing at 340-360 ℃/40-60 min.
(3) The angle difference between the drawing die angle and the core ball cone angle is larger when the rectangular pipe is drawn in a moving way than when the circular pipe is drawn in a moving way. In the test, the front round tube of the finished red copper hollow tube is stretched in a moving way, the angle of a stretching die is selected to be 13 degrees, and the angle of a core ball is selected to be 10.5 degrees; and (4) performing swimming stretching on the finished pipe, wherein the angle of a stretching die is selected to be 15 degrees, and the angle of a core ball is selected to be 10.5 degrees.
(4) The drawing lubricant is vegetable oil with high viscosity and enough surface activity, and is favorable for realizing moving drawing.
Detailed Description
Because the requirements of the quality, the R angle and the dimensional tolerance of the inner surface and the outer surface of the red copper hollow tube are strict and the red copper hollow tube is supplied in a roll form, if the red copper hollow tube is stretched by a short core ball or a long core rod, the requirement of the length (supply in a roll form) cannot be met; if the air-drawing is adopted, the requirements of the quality of the inner surface and the outer surface, the R angle and the dimensional tolerance can not be met, so that only the moving core ball can be stretched.
The drawing of the moving core ball disc is characterized in that: the drawing device can realize lining drawing (with core balls) without being limited by the length of a product, thereby realizing the drawing of a disc while solving the problems of the quality, the R angle and the dimensional tolerance of the inner surface and the outer surface of the product.
A red copper stretch forming process comprises the following steps:
s1, preparing raw materials: preparing a copper ingot meeting the requirements; wherein, the surface of the copper ingot is smooth and has no cracks, delamination, inclusion, scaling and oxide skin;
s2, extruding the copper ingot in the step S1 into a round pipe by adopting an 800-ton horizontal extruder; wherein parameters of the 800-ton horizontal extruder are set to be 800 ℃ in heating temperature, 13 degrees in drawing die angle and 10.5 degrees in core ball angle;
s3, rolling the round pipe in the step S2 by adopting an LG30 pipe rolling mill; wherein, in the step S3, vegetable oil and emulsion are selected as the lubricant in the rolling process.
S4, annealing the round tube rolled in the step S3; wherein the annealing treatment parameters in the step S4 are set as the annealing temperature of 260-280 ℃ and the heat preservation time of 40-60 min;
s5, stretching the round tube annealed in the step S4 by a disc stretcher; in step S5, parameters of the disc stretcher are set to be a drawing die angle of 15 ° and a core ball angle of 10.5 °;
s6, annealing the round tube which is stretched in the step S5 again; wherein the annealing treatment parameters in the step S6 are set as the annealing temperature of 260-280 ℃ and the heat preservation time of 40-60 min;
s7, checking the round tube annealed in the step S6, and screening out unqualified defective products to obtain a finished product tube.
The key of the product stretching is whether the floating core ball stretching can be realized. The key point of the moving core ball stretching is the selection of the die angle and the core ball cone angle, so that two sets of tools are selected for the test, and then comparison analysis is carried out according to the test result, and the most scientific tool is screened to finish the production of the product. According to the data, the reasonable design range of the tool is as follows: the angle of the drawing die is 13-16 degrees, the angle of the core ball is 9-11 degrees, and the material is preferably hard alloy. In the test, the parameters of the round tube stretching tool are as follows: the drawing die angle is 13 degrees, and the core ball angle is 10.5 degrees. Two sets of tools are designed for finished product stretching, and the tools are respectively as follows: the first set of drawing die angle is 13 degrees, and the core ball angle is 10.5 degrees; the second set of drawing dies has an angle of 15 deg., and the core ball has an angle of 10.5 deg.. The tool material is hard alloy. When the first set of stretching tool is adopted, stretching 10 round pipes, and breaking 9 round pipes; when the second set of stretching tool is adopted, 10 round pipes are stretched, and stretching is smooth. According to the introduction of data, under the same process conditions, the larger the angle of the die is in a reasonable range, the shorter the deformation zone is, and the smaller the friction force is, so that the drawing force is reduced, and the risk of the product being broken by drawing is reduced.
The extruded red copper tube blank is hardened after rolling and stretching, the resistance to continuous stretching deformation is increased, intermediate annealing is adopted to eliminate hardening and improve plastic deformation capacity, and crystal grains are refined through repeated deformation and recrystallization annealing. In order to ensure the technical requirements of the product and improve the surface quality of the product, finished product annealing is adopted. The annealing is uniformly carried out in vacuum, so that the problem of poor surface quality caused by poor pickling quality after oxidation annealing is avoided. According to the data, the annealing process parameters were selected as follows: intermediate annealing at 260-280 deg.c/40-60 min; annealing the finished product at 340-360 ℃/40-60 min.
According to the data, to realize the stretching of the swimming core ball, the following requirements are met:
angle of friction < core cone angle < mode angle
Therefore, whether the moving core ball is stretched or not can be realized, besides tool factors, lubrication is also a key factor, the lubrication quality is poor, the friction force is too large, the core ball and the pipe move simultaneously, the core ball cannot move and can be clamped in a pipe deformation area, and the pipe is forced to be broken; the lubricating quality is good, not only can the moving stretching be realized, but also the surface quality of the pipe can be improved, and the stretching force can be reduced, thereby saving energy. To achieve these effects, the test has selected a lubricant, vegetable oil, which is relatively viscous and sufficiently surface-active.
The invention relates to a sodium sulfide concentration device and a process thereof, which have the beneficial effects that: the production process of the red copper hollow tube is feasible by adopting the modes of ingot casting → extrusion → tube rolling → annealing → stretching → annealing. The extrusion and rolling process is a process stage for manufacturing products, and qualified blanks are provided according to requirements; the moving core ball is adopted for stretching, the processing rate is controlled between 25 percent and 35 percent, and the disc supply of products can be realized. By adding intermediate softening annealing at 280-320 ℃/40-60 min, the processing hardening is eliminated, the plasticity is improved, the continuous deformation is easy, and the surface quality of the product is good; the finished product can meet the requirements of various technical indexes of the red copper hollow pipe by annealing at 340-360 ℃/40-60 min. The angle difference between the drawing die angle and the core ball cone angle during the moving drawing of the circular tube is larger than the angle difference between the drawing die angle and the core ball cone angle during the moving drawing of the circular tube. In the test, the front round tube of the finished red copper hollow tube is stretched in a moving way, the angle of a stretching die is selected to be 13 degrees, and the angle of a core ball is selected to be 10.5 degrees; and (4) performing swimming stretching on the finished pipe, wherein the angle of a stretching die is selected to be 15 degrees, and the angle of a core ball is selected to be 10.5 degrees. The drawing lubricant is vegetable oil with high viscosity and enough surface activity, and is favorable for realizing moving drawing.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A red copper stretch forming part process is characterized by comprising the following steps:
s1, preparing raw materials: preparing a copper ingot meeting the requirements;
s2, extruding the copper ingot in the step S1 into a round pipe by adopting an 800-ton horizontal extruder;
s3, rolling the round pipe in the step S2 by adopting an LG30 pipe rolling mill;
s4, annealing the round tube rolled in the step S3;
s5, stretching the round tube annealed in the step S4 by a disc stretcher;
s6, annealing the round tube which is stretched in the step S5 again;
s7, checking the round tube annealed in the step S6, and screening out unqualified defective products to obtain a finished product tube.
2. The red copper drawn member forming process according to claim 1, wherein the copper ingot in the step S1 has a smooth surface without cracks, delamination, inclusions, scaling and scale.
3. The red copper stretch forming process according to claim 1, wherein the parameters of the 800 ton horizontal extruder are set to a heating temperature of 800 ℃, a drawing die angle of 13 ° and a core ball angle of 10.5 °.
4. The red copper stretch forming process according to claim 1, wherein the annealing temperature in the step S4 is 260-280 ℃ and the holding time is 40-60 min.
5. The copper drawing forming process of claim 1, wherein the parameters of the disc drawing machine in the step S5 are set to a drawing die angle of 15 ° and a core ball angle of 10.5 °.
6. The red copper stretch forming process according to claim 1, wherein the parameters of the annealing treatment in the step S6 are set to be an annealing temperature of 260 ℃ to 280 ℃ and a holding time of 40 min to 60 min.
7. The copper drawing forming process of claim 1, wherein vegetable oil and emulsion are selected as lubricant in the rolling process of step S3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010878739.8A CN112058939A (en) | 2020-08-27 | 2020-08-27 | Red copper tensile member forming process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010878739.8A CN112058939A (en) | 2020-08-27 | 2020-08-27 | Red copper tensile member forming process |
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| Publication Number | Publication Date |
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| CN112058939A true CN112058939A (en) | 2020-12-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010878739.8A Pending CN112058939A (en) | 2020-08-27 | 2020-08-27 | Red copper tensile member forming process |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3119698A1 (en) * | 1981-05-18 | 1982-12-02 | Kabel- und Metallwerke Gutehoffnungshütte AG, 3000 Hannover | Method for the production of bendable copper tubes |
| CN1754649A (en) * | 2004-09-30 | 2006-04-05 | 洛阳铜加工集团有限责任公司 | Cupronickel condensation tube production process using disk stretch |
| CN101070931A (en) * | 2007-04-23 | 2007-11-14 | 中铝洛阳铜业有限公司 | Method for preparing large-diameter white copper pipe |
| CN102899595A (en) * | 2012-09-05 | 2013-01-30 | 苏州富瑞铜合金科技有限公司 | Copper-nickel alloy tube preparation method |
| CN103861887A (en) * | 2014-03-20 | 2014-06-18 | 北京科技大学 | Preparation method of high-performance copper/titanium bimetal capillary tube |
| CN109201770A (en) * | 2018-09-13 | 2019-01-15 | 河北欧通有色金属制品有限公司 | A kind of processing method of large caliber ultra-long bronze pan tube |
-
2020
- 2020-08-27 CN CN202010878739.8A patent/CN112058939A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3119698A1 (en) * | 1981-05-18 | 1982-12-02 | Kabel- und Metallwerke Gutehoffnungshütte AG, 3000 Hannover | Method for the production of bendable copper tubes |
| CN1754649A (en) * | 2004-09-30 | 2006-04-05 | 洛阳铜加工集团有限责任公司 | Cupronickel condensation tube production process using disk stretch |
| CN101070931A (en) * | 2007-04-23 | 2007-11-14 | 中铝洛阳铜业有限公司 | Method for preparing large-diameter white copper pipe |
| CN102899595A (en) * | 2012-09-05 | 2013-01-30 | 苏州富瑞铜合金科技有限公司 | Copper-nickel alloy tube preparation method |
| CN103861887A (en) * | 2014-03-20 | 2014-06-18 | 北京科技大学 | Preparation method of high-performance copper/titanium bimetal capillary tube |
| CN109201770A (en) * | 2018-09-13 | 2019-01-15 | 河北欧通有色金属制品有限公司 | A kind of processing method of large caliber ultra-long bronze pan tube |
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Application publication date: 20201211 |