CN116422718B - Continuous spinning reducing processing method and manufacturing method of copper-tin-iron alloy micro-fine wire - Google Patents
Continuous spinning reducing processing method and manufacturing method of copper-tin-iron alloy micro-fine wire Download PDFInfo
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- CN116422718B CN116422718B CN202310217551.2A CN202310217551A CN116422718B CN 116422718 B CN116422718 B CN 116422718B CN 202310217551 A CN202310217551 A CN 202310217551A CN 116422718 B CN116422718 B CN 116422718B
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- 229910000640 Fe alloy Inorganic materials 0.000 title claims abstract description 39
- ORTNWICOMQLICI-UHFFFAOYSA-N [Fe].[Cu].[Sn] Chemical compound [Fe].[Cu].[Sn] ORTNWICOMQLICI-UHFFFAOYSA-N 0.000 title claims abstract description 37
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 25
- 238000009987 spinning Methods 0.000 title abstract description 16
- 238000003672 processing method Methods 0.000 title abstract description 9
- 238000009749 continuous casting Methods 0.000 claims abstract description 103
- 238000000034 method Methods 0.000 claims abstract description 65
- 238000003825 pressing Methods 0.000 claims abstract description 62
- 230000008569 process Effects 0.000 claims abstract description 41
- 238000010438 heat treatment Methods 0.000 claims abstract description 29
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims abstract description 12
- 238000005266 casting Methods 0.000 claims abstract description 12
- 238000001816 cooling Methods 0.000 claims abstract description 11
- 230000005540 biological transmission Effects 0.000 claims abstract description 10
- 230000009467 reduction Effects 0.000 claims abstract description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 16
- 229910052742 iron Inorganic materials 0.000 claims description 8
- 238000004381 surface treatment Methods 0.000 claims description 8
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 7
- 229910052802 copper Inorganic materials 0.000 claims description 7
- 239000010949 copper Substances 0.000 claims description 7
- 238000000137 annealing Methods 0.000 claims description 6
- 238000005096 rolling process Methods 0.000 claims description 6
- 230000001360 synchronised effect Effects 0.000 claims description 6
- 230000009471 action Effects 0.000 claims description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 3
- 239000001301 oxygen Substances 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- 238000004321 preservation Methods 0.000 claims description 3
- 239000005068 cooling lubricant Substances 0.000 claims 1
- 238000007670 refining Methods 0.000 abstract description 11
- 238000003723 Smelting Methods 0.000 abstract description 7
- 238000005204 segregation Methods 0.000 abstract description 3
- 239000000463 material Substances 0.000 description 13
- 239000000956 alloy Substances 0.000 description 8
- 239000013078 crystal Substances 0.000 description 8
- 229910045601 alloy Inorganic materials 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 6
- 230000007547 defect Effects 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 238000001125 extrusion Methods 0.000 description 5
- 238000002425 crystallisation Methods 0.000 description 4
- 230000008025 crystallization Effects 0.000 description 4
- 229910000881 Cu alloy Inorganic materials 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 239000011261 inert gas Substances 0.000 description 3
- 238000010587 phase diagram Methods 0.000 description 3
- IYRDVAUFQZOLSB-UHFFFAOYSA-N copper iron Chemical compound [Fe].[Cu] IYRDVAUFQZOLSB-UHFFFAOYSA-N 0.000 description 2
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical class [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005485 electric heating Methods 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000001050 lubricating effect Effects 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 210000003632 microfilament Anatomy 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910000570 Cupronickel Inorganic materials 0.000 description 1
- 102000002151 Microfilament Proteins Human genes 0.000 description 1
- 108010040897 Microfilament Proteins Proteins 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- YOCUPQPZWBBYIX-UHFFFAOYSA-N copper nickel Chemical compound [Ni].[Cu] YOCUPQPZWBBYIX-UHFFFAOYSA-N 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000007514 turning Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
- 238000005491 wire drawing Methods 0.000 description 1
Classifications
-
- 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
-
- 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
- B21C19/00—Devices for straightening wire or like work combined with or specially adapted for use in connection with drawing or winding machines or apparatus
-
- 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
- B21C3/00—Profiling tools for metal drawing; Combinations of dies and mandrels
- B21C3/02—Dies; Selection of material therefor; Cleaning thereof
-
- 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
Abstract
The application relates to a continuous spinning reducing processing method, which comprises the following steps: s1: straightening a continuous casting rod blank; s2: a torsion procedure, namely clamping the continuous casting rod blank through a torsion assembly, continuously carrying out torsion on the continuous casting rod blank while carrying out backward traction and transmission, wherein each torsion angle is 90-180 degrees; s3: a ring pressing procedure, namely immediately and continuously carrying out ring pressing diameter reduction on the twisted continuous casting rod blank through a traction belt to a ring pressing assembly, so that the diameter of the continuous casting rod blank is reduced; s4: a cooling step; also relates to a manufacturing method of the copper-tin-iron alloy micro-thin wire, which comprises the following steps: an oxygen-free smelting copper-tin-iron alloy process, an oxygen-free casting process, a heat treatment process and a drawing process, and further comprises a continuous hot torsion ring pressing process arranged between the oxygen-free casting process and the heat treatment process; the application solves the key technical problems that how to realize flexible continuous grain refining, properly reduce tin content and segregation and solve the need of manufacturing high-strength copper-tin-iron alloy micro-resistance wires.
Description
Technical Field
The application relates to the technical field of nonferrous metal processing, in particular to a continuous spinning reducing processing method and a manufacturing method of copper-tin-iron alloy micro-fine wires.
Background
The electric resistance alloy has lower electric conductivity, copper alloy is adopted as the resistance material for heating, a certain proportion of alloy components are often required to be added to reduce the electric conductivity, and if the content of the alloy components is higher, the material has higher strength, can keep stable resistance at a certain temperature, and is very suitable for being used as an electric heating material.
At present, the existing copper-tin alloy is used as a novel electrothermal alloy material, has better processing performance than copper-nickel, but the higher tin content can generate segregation, so that the material is hardened and becomes brittle, and the subsequent processing is influenced; the adoption of the grain refining method can remove casting defects and improve toughness, and is beneficial to drawing materials into fine wires with the diameter of less than 0.1 millimeter. If continuous extrusion is adopted to refine the grain size of the rod blank, the phenomenon of extrusion is generated for harder copper-tin-iron alloy materials, and the continuity and quality of extrusion are seriously affected; if a hot continuous rolling process is adopted, the equipment is complex, the volume is large, and the cost is high.
Therefore, how to realize flexible continuous grain refining and properly reduce tin content and segregation is one of the key technical problems to be solved in manufacturing high-strength copper-tin-iron alloy micro-resistance wires.
Disclosure of Invention
One of the purposes of the application is to provide a continuous spinning reducing processing method aiming at the defects of the prior art, and the continuous spinning reducing processing method is combined with torsion and ring pressing mode, and is matched with continuous traction transmission of a continuous casting rod blank, so that primary fine crystallization of torsion deformation and secondary fine crystallization of ring pressing deformation are realized while the continuous casting rod blank is in backward traction transmission.
Aiming at the technical problems, the technical scheme is as follows: the continuous spinning reducing machining method comprises the following steps:
s1: straightening a continuous casting rod blank;
s2: a torsion procedure, namely clamping the continuous casting rod blank through a torsion assembly, continuously carrying out torsion on the continuous casting rod blank while carrying out backward traction and transmission, wherein each torsion angle is 90-180 degrees;
s3: a ring pressing procedure, namely immediately and continuously carrying out ring pressing diameter reduction on the twisted continuous casting rod blank through a traction belt to a ring pressing assembly, so that the diameter of the continuous casting rod blank is reduced;
s4: and a cooling step of cooling the deformed continuous casting rod blank to obtain a fine-grain rod blank.
Preferably, after the continuous casting rod blank is subjected to ring pressing and reducing in the S3 process, the total pressing deformation is 10% -20%.
Preferably, in the twisting step, the pressure of the twisting component acting on the continuous casting rod blank is F1, and the pressure of the ring pressing component acting on the continuous casting rod blank in the ring pressing step is F2, so that F1 < F2 is satisfied.
Preferably, the torsion assembly includes:
a plurality of engaging portions which are annularly arranged on the circumferential direction of the continuous casting rod blank and synchronously rotate with the first rotating portion; and
and the first control part is used for controlling the synchronous action of a plurality of the engaging parts to continuously clamp the continuous casting rod blank which is continuously conveyed.
Preferably, the ring press assembly is coaxially disposed with the torsion assembly, and includes:
a plurality of ring pressing parts rotating synchronously with the second rotating part; and
the ring pressing parts are used for controlling the ring pressing and reducing the diameter of the continuous casting rod blank intermittently in the synchronous rotation process, and the continuous casting rod blank after the diameter reduction is conveyed backwards through traction after the ring pressing parts are released.
Preferably, the front end of the torsion assembly is further provided with a heating assembly for preheating the continuous casting rod blank after being straightened in the step S1.
The application has the beneficial effects that:
(1) According to the continuous casting rod blank continuous rolling device, a torsion combined ring rolling mode is adopted in a deformation mode, the continuous casting rod blank is continuously driven, torsion, spinning and transmission are continuous, continuous output of the continuous casting rod blank can be achieved, the working efficiency is greatly improved by adopting the continuous mode, the continuous casting rod blank is driven to rotate after the engagement part bites the continuous casting rod blank, the ring rolling part immediately continues to compact the continuous casting rod blank after the engagement part is loosened, the diameter changing and flattening of the continuous casting rod blank are achieved, and the consistent diameter reducing of the continuous casting rod blank can be kept by adopting the torsion combined spinning mode; in addition, the universality is good, the soft and hard alloy is suitable, no waste and flash production is caused, and the method is more suitable for continuous micro-wire processing.
The second purpose of the application is to provide a manufacturing method of copper-tin-iron alloy micro-fine wire, aiming at the defects of the prior art, by adding a proper amount of iron into copper-tin alloy and reducing tin content, the method is beneficial to stabilizing material resistance, improving casting quality and saving tin cost; and by combining a thermal torsion ring pressing technology, the multistage continuous fine crystallization of the material is realized, and the forming processing of micro-fine wires is facilitated.
The manufacturing method of the copper-tin-iron alloy micro-thin wire comprises the following steps: the continuous spinning reducing processing method comprises the steps of performing anaerobic smelting on copper-tin-iron alloy, performing anaerobic casting, performing heat treatment, performing drawing, and further comprises a continuous hot torquing process arranged between the anaerobic casting and the heat treatment, wherein the continuous hot torquing process comprises the specific steps of straightening and preheating a continuous casting rod blank to more than 500 ℃ in the step S1.
Preferably, the copper-tin-iron alloy comprises the following components in parts by weight: 0.4% -6% of tin, 0.02% -0.5% of iron, and the balance of copper and trace impurities, wherein the oxygen content is lower than 20PPM, and the conductivity of the copper-tin-iron alloy is 10% -80% IACS.
Preferably, the method further comprises a surface treatment step provided before or after the heat treatment step; and in the heat treatment process, the annealing temperature is 200-800 ℃, the heat preservation time is not less than 2 hours, and the heat is naturally cooled.
Preferably, the drawing process comprises rough drawing and finish drawing, and the drawing process adopts drawing equipment with cooling lubricating liquid to carry out reducing drawing, so as to obtain the copper-tin-iron alloy micro-fine wire for the heating wire with the diameter size of 0.025-0.3 mm.
The application has the beneficial effects that:
(1) According to the technical scheme, continuous grain refining of the material is realized by a hot torsion ring pressing technology, and the processing of micro fine wires is facilitated, so that the method is simple, flexible and reliable, has strong universality and can realize the production of various high-strength copper alloy micro fine wires at low cost;
(2) According to the application, the continuous casting rod blank obtained in the step of oxygen-free smelting of the copper-tin-iron alloy is straightened and preheated to about 500 ℃, so that the dynamic change of the internal crystal of the continuous casting rod blank is quickened during torsion, the grain refining is facilitated, and the continuous reducing forming of the continuous casting rod blank is facilitated.
In conclusion, the equipment has the advantages of low cost and high strength, and is particularly suitable for manufacturing copper-tin-iron alloy filaments for high-strength resistance heating wires.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, it being obvious that the drawings described below are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic process flow diagram of a continuous spinning reducing process.
Fig. 2 is a schematic process flow diagram of a method for manufacturing copper-tin-iron alloy micro-wires for a three-high strength resistance heating wire according to an embodiment.
Fig. 3 is a schematic view showing the surface structure of a continuous casting bar after being deformed in a conventional manner.
Fig. 4 is a schematic view showing the surface structure of a continuous casting bar blank obtained by continuous spinning reducing processing according to the first embodiment.
Fig. 5 is a cross-sectional crystal phase diagram of a continuous casting bar blank before continuous spinning reducing machining.
Fig. 6 is a cross-sectional crystal phase diagram of a continuous casting bar blank after torsional deformation.
Fig. 7 is a cross-sectional crystal phase diagram of a continuous casting bar blank after ring press deformation.
Fig. 8 is a schematic view showing a driving state of the torsion assembly and the ring pressing assembly.
Fig. 9 is a schematic view of the internal structure of the ring press assembly or torsion assembly.
Fig. 10 is a schematic view of the structure of the nip or loop-pressing portion.
Detailed Description
The technical solutions in the embodiments of the present application are clearly and completely described below with reference to the accompanying drawings.
Example 1
As shown in fig. 1, the continuous spinning reducing processing method includes the steps of:
s1: a straightening step of straightening the continuous casting bar 100;
s2: a twisting step of continuously twisting the continuous casting bar 100 while being pulled backward while clamping the continuous casting bar 100 by the twisting unit 2, each twisting angle being 90 to 180 degrees;
s3: a ring pressing process, namely immediately and continuously performing ring pressing reducing on the twisted continuous casting rod blank 100 by pulling the belt to the ring pressing assembly 3, so that the diameter of the continuous casting rod blank 100 is reduced;
s4: and a cooling step of cooling the deformed continuous casting rod blank 100 to obtain a fine-grain rod blank.
Firstly, the continuous casting rod blank obtained in the procedure of oxygen-free smelting of copper-tin-iron alloy is straightened and preheated to about 500 ℃, so that the dynamic change of the internal crystal of the continuous casting rod blank is quickened during torsion, the grain refining is facilitated, and the continuous reducing forming of the continuous casting rod blank is facilitated.
The application adopts a deformation mode which is a torsion combined ring pressing mode, and the transmission of the continuous casting rod blank 100 is continuous, and the torsion, spinning and transmission are continuous, so that the continuous casting rod blank can realize continuous output, and the working efficiency is greatly improved by adopting a continuous mode with a winding length of a few kilometers; in addition, the technical scheme has good universality, is suitable for both soft and hard alloys, and has no waste and flash production.
Further, after the continuous casting rod blank 100 is subjected to ring pressing and reducing in the step S3, the total pressing deformation is 10% -20%.
Further, the pressure of the torsion assembly 2 acting on the continuous casting rod blank 100 is F1, and the pressure of the ring-press assembly 3 acting on the continuous casting rod blank 100 in the ring-press procedure is F2, so that F1 < F2 is satisfied. In the S4 process, the deformed continuous casting rod blank 100 is preferably continuously pulled to the water tank for cooling, so that the production line efficiency is improved, and the cost is saved.
Further, the torsion assembly 2 includes:
a plurality of engaging portions 22 which are provided around the continuous casting bar 100 and rotate in synchronization with the first rotating portion; and
a first control part 23 for controlling the synchronous operation of the plurality of the engaging parts 22 to continuously clamp the continuously transferred continuous casting bar 100.
In this embodiment, the first control part 23 is used to intermittently clamp the continuous casting bar 100 before the drawing belt reaches the ring pressing assembly 3 in the process of synchronously rotating the engaging parts 22 by the first rotating part 21, and the continuous casting bar 100 is synchronously and continuously twisted when being clamped by the engaging parts 22.
The clamping space diameter of the feed end of the plurality of engaging portions 22 is larger than the clamping space diameter of the discharge end thereof when the strand 100 is clamped.
Further, as shown in fig. 8 to 10, the ring press assembly 3 is coaxially disposed with the torsion assembly 2, and includes:
a plurality of ring pressing portions 32 rotating in synchronization with the second rotating portion 31; and
for controlling the plurality of the ring presses 32 to perform ring press reducing on the continuous casting bar billet 100 intermittently in the process of synchronous rotation, and the reduced continuous casting bar billet 100 is transferred backward by traction after the release of the ring presses 32.
It should be noted that, the continuous casting rod blank 100 is continuously twisted synchronously when clamped by the ring pressing portions 32, and the ring pressing portions are oppositely arranged in pairs, so that the stress is more stable and uniform in the extrusion deformation process.
In addition, the first rotating part 21 and the second rotating part 31 rotate continuously during operation, and since the continuous casting rod blank 100 is thinned and lengthened in the ring pressing and reducing process under the action of the ring pressing assembly 3, the rotating speed of the second rotating part 31 is not less than that of the first rotating part 21, so that on one hand, the quality of the section of continuous casting rod blank between the torsion assembly 2 and the ring pressing assembly 3 is guaranteed, and the fracture phenomenon is avoided; on the other hand, the continuous casting rod blank is improved to enter the ring pressing assembly 3 immediately after being subjected to torsional deformation and grain refining by the torsional assembly 3 for ring pressing and reducing, and the quality of ring pressing and reducing and grain refining again is further improved by utilizing the maximum utilization of heat generated by torsional deformation.
The working principle of the torsion assembly 2 is as follows: the motor drives the engaging part 22 to rotate through the belt and twist and loosen, the engaging part 22 is twisted one by one, when the engaging part 22 is engaged, the continuous casting rod blank is twisted instantly, the travelling size of each time of twisting is not smaller than the traction travelling distance in the same time, and further, the twisting deformation is realized in the twisting process, and the grains are refined;
it should be noted that, the torsion assembly 2 and the ring pressing assembly 3 are combined to form a mold tool, the first rotating part 21 of the torsion assembly 2 can adopt a circular disc structure, the engaging part 22 is slidably arranged along the circumferential direction of the first rotating part 21 to form a plurality of groups, the engaging part 22 is synchronously rotated under the driving of the first rotating part 21, and the engaging part 22 is gathered towards the axle center to complete the encircling clamping work of the continuous casting rod blank 100 through the guidance of the first control part 23 in the rotating process; as shown in fig. 10, an elastic structure may be further disposed in the first rotating portion for supporting and guiding the correspondingly installed engaging portion 22 to improve the stability of transmission; the structure and working principle of the ring pressing assembly 3 are the same as or similar to those of the torsion assembly, and will not be described herein. But the pressure F1 of the torsion assembly 2 acting on the continuous casting rod blank 100 is smaller than the pressure F2 of the ring pressing assembly 3 acting on the continuous casting rod blank 100 in the ring pressing procedure, the ring pressing assembly 3 continuously ring presses and reduces the diameter of the continuous casting rod blank 100 subjected to primary grain refining by the torsion assembly 2, thereby realizing secondary grain refining and being beneficial to processing of micro fine wires.
The specific structure of the torsion assembly 2 and the ring pressing assembly 3 in the present embodiment is a preferred structure for realizing the process in the present embodiment, but is not limited to the structure, the protection scope of the present application is not limited thereto, and any changes or substitutions easily conceivable by those skilled in the art under the technical teaching of the present application should be covered in the protection scope of the present application.
In this embodiment, the front end of the continuous casting rod blank is provided with the guide wheel 1, so as to position and guide the transmission of the continuous casting rod blank, and the biting part bites the continuous casting rod blank and then drives the continuous casting rod blank to rotate, after the continuous casting rod blank is loosened, the ring pressing part immediately continues to press the ring of the continuous casting rod blank, namely, the ring pressing part presses down and synchronously rotates, so that the diameter variation and flattening of the continuous casting rod blank are realized, and compared with the traditional pure drawing or pure extrusion diameter variation mode, the twisting and ring pressing mode is combined with consistent product surface quality and consistent diameter reduction.
Further, a heating unit for preheating the continuous casting bar 100 after straightening in the step S1 is further provided at the front end of the torsion unit 2.
It should be noted that the heating element may be an electric heating manner, such as an induction coil heating manner, but is not limited to this heating manner.
Example two
As shown in fig. 1 to 10, a method for manufacturing a copper-tin-iron alloy micro-thin wire includes the steps of: the method further comprises a continuous hot torquing process arranged between the anaerobic casting process and the heat treatment process, wherein the specific steps of the continuous hot torquing process are as in the continuous spinning reducing processing method in the first embodiment, and the step S1 is to straighten and preheat the continuous casting rod blank 100 to more than 500 ℃.
Further, the copper-tin-iron alloy comprises the following components in parts by weight: 0.4% -6% of tin, 0.02% -0.5% of iron, and the balance of copper and unavoidable trace impurities, wherein the oxygen content is lower than 20PPM, and the conductivity of the copper-tin-iron alloy is 10% -80% IACS.
In the step of oxygen-free smelting of the copper-tin-iron alloy, the copper-tin-iron alloy is oxygen-free smelted by using an electromagnetic induction heating smelting furnace with vacuum or inert gas protection, and then is cast by using a continuous oxygen-free downward casting, continuous horizontal casting or continuous upward casting mode through an oxygen-free casting step to obtain the continuous casting rod blank 100.
The components of the continuous casting rod blank are 2 percent of tin, 0.1 percent of iron and the balance of oxygen-free copper in percentage by weight, the copper-tin-iron alloy is smelted by adopting upward continuous casting, the tin and the iron or the copper-iron alloy are added into molten copper in proportion by weight, and the upward continuous casting is carried out after the components are uniform to form the rod blank.
Further, the method further comprises a surface treatment step provided before or after the heat treatment step; and in the heat treatment process, the annealing temperature is 200-800 ℃, the heat preservation time is not less than 2 hours, and the heat is naturally cooled.
The surface treatment step is used to remove surface defects and oxides of the bar, and the outer surface of the continuous casting bar after the twisting ring pressing has a screw shape as shown in fig. 4, but in the conventional method for manufacturing copper-tin-iron alloy micro-wire for heating wire, the surface treatment step is originally provided in the reducing step, so that the process itself does not add other difficulties and complicated steps, but the surface treatment step may be provided before the heat treatment step, and the annealing treatment may be performed by adopting an inert gas protection.
Further, the drawing process comprises a rough drawing process and a finish drawing process, wherein the drawing process comprises a wire drawing device with cooling lubricating liquid for reducing drawing, and the copper-tin-iron alloy micro-thin wire for the heating wire with the diameter size of 0.025-0.3 mm is obtained.
The annealed wire blank was subjected to multiple finish drawing to form a fine wire having a diameter of up to 0.025 mm at the minimum, and the wire was about 20% iacs in conductivity.
Wherein, for the continuous grain refining process of the continuous casting rod blank in the continuous hot torsion ring pressing process, the internal grain change is shown in fig. 5-7.
Example III
As shown in fig. 2, the present embodiment provides a method for manufacturing a copper-tin-iron alloy micro-wire for a high-strength resistance heating wire, wherein the copper-tin-iron alloy comprises the following components in parts by weight: tin 2%, iron 0.1%, and the balance being oxygen-free copper. The processing technology comprises the following specific steps:
step A, smelting copper-tin-iron alloy by adopting upward continuous casting, adding tin and iron or copper-iron alloy into molten copper according to the weight proportion, and performing upward continuous casting after components are uniform to form a continuous casting rod blank 100;
step B, continuously heating the continuous casting rod blank 100 to 500 ℃ through induction after straightening, entering a torsion process through a tractor, and enabling the engagement part 22 to engage the continuous casting rod blank 100 so as to enable the continuous casting rod blank 100 to twist 180 degrees, wherein crystal grains of a rod blank material are crushed and recrystallized through torsion; the twisted blank is then pulled to the ring pressing assembly 3, the ring pressing part rotates synchronously and presses reciprocally, the pressing deformation is 20%, the continuous casting rod blank 100 is thinned, the material can be further recrystallized through ring pressing, internal defects are welded, and the compactness of the material is increased;
step C, continuously drawing the reduced continuous casting rod blank 100 to a water tank for cooling to obtain a fine crystal rod blank;
step D, carrying out surface treatment on the fine crystal rod blank obtained in the step C, namely peeling or turning, and removing surface oxides and defects;
step E, rough drawing is carried out on the rod blank subjected to surface treatment, and a wire blank with the diameter of about 3 mm is drawn;
step F, carrying out inert gas protection annealing on the wire blank, wherein the annealing temperature is 400 ℃, and preserving the heat for 2 hours;
and G, carrying out multi-pass finish drawing on the annealed wire blank to form a micro-wire with the diameter of 0.025 mm at the minimum, wherein the conductivity of the micro-wire is about 20% IACS.
In summary, the copper-tin-iron alloy technology provided by the application can be used for manufacturing electrothermal alloy microfilaments with excellent processability, and the method forms a novel continuous crystallization technology and a die for high-strength materials, thereby being beneficial to improving the production flexibility, reducing the production cost and being applicable to manufacturing other various high-strength copper alloy microfilament materials. The application thus has good innovativeness and practicality.
The foregoing description of the preferred embodiments of the application is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the application.
Claims (6)
1. The manufacturing method of the copper-tin-iron alloy micro-thin wire comprises the following steps: the method is characterized by further comprising a continuous hot twisting ring pressing process arranged between the anaerobic casting process and the heat treatment process, and the continuous hot twisting ring pressing process comprises the following specific steps of:
s1: straightening, namely straightening and preheating a continuous casting rod blank to more than 500 ℃;
s2: a torsion procedure, namely clamping the continuous casting rod blank through a torsion assembly, continuously carrying out torsion on the continuous casting rod blank while carrying out backward traction and transmission, wherein each torsion angle is 90-180 degrees;
s3: a ring pressing procedure, namely immediately and continuously carrying out ring pressing diameter reduction on the twisted continuous casting rod blank through a traction belt to a ring pressing assembly, so that the diameter of the continuous casting rod blank is reduced;
s4: a cooling step of cooling the deformed continuous casting rod blank to obtain a fine-grain rod blank;
the copper-tin-iron alloy comprises the following components in parts by weight: 0.4% -6% of tin, 0.02% -0.5% of iron, and the balance of copper and trace impurities, wherein the oxygen content is lower than 20PPM, and the conductivity of the copper-tin-iron alloy is 10% -80% IACS;
the torsion assembly includes:
a plurality of engaging portions which are annularly arranged on the circumferential direction of the continuous casting rod blank and synchronously rotate with the first rotating portion; and
a first control part for controlling the synchronous action of a plurality of the engaging parts to continuously clamp the continuous casting rod blank which is continuously transmitted;
the ring press assembly is coaxially disposed with the torsion assembly, and includes:
a plurality of ring pressing parts rotating synchronously with the second rotating part; and
the ring pressing parts are used for controlling the ring pressing and reducing the diameter of the continuous casting rod blank intermittently in the synchronous rotation process, and the continuous casting rod blank after the diameter reduction is conveyed backwards through traction after the ring pressing parts are released.
2. The method of manufacturing a fine copper-tin-iron alloy wire according to claim 1, wherein the continuous casting bar is subjected to ring rolling reduction in step S3, and the total rolling deformation is 10% to 20%.
3. The method according to claim 1, wherein in the twisting step, a pressure of the twisting member acting on the strand is F1, and a pressure of the ring pressing member acting on the strand is F2, and F1 < F2 is satisfied.
4. A method of manufacturing a copper-tin-iron alloy micro-wire according to any one of claims 1 to 3, wherein the front end of the torsion assembly is further provided with a heating assembly for preheating the continuous casting bar billet after straightening in the step S1.
5. The method of manufacturing a copper-tin-iron alloy micro-wire according to claim 1, further comprising a surface treatment step provided before or after the heat treatment step; and in the heat treatment process, the annealing temperature is 200-800 ℃, the heat preservation time is not less than 2 hours, and the heat is naturally cooled.
6. The method according to claim 1, wherein the drawing step includes rough drawing and finish drawing, and the drawing step is performed by reducing drawing using drawing equipment with a cooling lubricant to obtain the copper-tin-iron alloy micro-wire for heating wire having a finished diameter of 0.025 to 0.3 mm.
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