CN111687235B - Method for improving yield of titanium alloy wire - Google Patents
Method for improving yield of titanium alloy wire Download PDFInfo
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- CN111687235B CN111687235B CN202010506096.4A CN202010506096A CN111687235B CN 111687235 B CN111687235 B CN 111687235B CN 202010506096 A CN202010506096 A CN 202010506096A CN 111687235 B CN111687235 B CN 111687235B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/04—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of bars or wire
- B21C37/047—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of bars or wire of fine wires
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- C—CHEMISTRY; METALLURGY
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
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Abstract
The invention relates to the technical field of titanium alloy wire preparation, and discloses a method for improving the yield of a titanium alloy wire. The method comprises the following steps: A. straightening a wire with the diameter of 7.8-8.2mm, and clamping the wire at the inlet of a rotary forging machine; B. reducing the diameter of the wire rod with the diameter of 7.8-8.2mm to the diameter of 1.8-2.2mm by adopting a rotary swaging machine; C. in the reducing process, when the diameters of the wires are phi 5.8-6.2mm, phi 4.3-4.7mm, phi 3.2-3.6mm and phi 2.4-2.8mm respectively, annealing is carried out by adopting a vacuum annealing furnace; D. during the reducing process, the wire is lubricated and cooled with antiwear hydraulic oil. The method does not use wire drawing powder as a lubricant, reduces the pickling process, reduces the diameter by using a roller die, eliminates the scratch on the surface of the wire rod, and ensures the smoothness of the surface. Meanwhile, the problems of serious surface oxidation and the like of the material are avoided through cold processing in the reducing process, and the yield of the material is greatly improved.
Description
Technical Field
The invention relates to the technical field of titanium alloy wire preparation, in particular to a method for improving the yield of a titanium alloy wire.
Background
Titanium alloys have been widely used in the aerospace and energy fields due to their high specific strength and good oxidation and hot corrosion resistance. Because the price of the titanium alloy is higher than that of the aluminum alloy, the processing cost of the finished titanium alloy product and the yield of the finished titanium alloy product directly influence the price in the process of popularizing the titanium alloy in a large quantity.
At present, titanium alloy wires are manufactured to be about 8.0 mm-12.0 mm wires through multiple times of smelting, cogging, hot rolling and scalping in a vacuum consumable electrode furnace. The subsequent processing generally adopts the fixed mould hot drawing to carry out reducing drawing or directly carries out cold drawing through the fixed mould under the dry powder lubrication action. The diameter is reduced by adopting a hot drawing mode, the surface of the material is oxidized in the heating process, and after the material is drawn to a specified size, the surface of the titanium alloy wire is cleaned by adopting an acid washing mode, so that the yield of the material is low. The diameter is reduced by adopting a dry powder lubrication cold drawing mode, and due to the shape of granular substances, the surface of a wire is often damaged when the wire is in contact with and extruded by the wire to perform a die; in the cold drawing process of the material, the extension direction and the stress direction of the material are consistent, and in order to avoid tensile fracture of the material, the reduction of the material in each pass is small, so that the total pass of cold drawing is increased, the annealing pass is increased, and the processing cost is greatly increased.
Based on the above situation, it is necessary to develop research on a method for manufacturing a titanium alloy wire rod with good surface quality, to improve the yield of the titanium alloy wire rod, to reduce the cost, and to realize stable and batch production.
Disclosure of Invention
The invention aims to solve the problems of surface scratches, rough surface, serious surface oxidation and low yield of the produced titanium alloy wire in the prior art, and provides a method for improving the yield of the titanium alloy wire. Meanwhile, the problems of serious surface oxidation and the like of the material are avoided through cold processing in the reducing process, and the yield of the material is greatly improved.
In order to achieve the above object, the present invention provides a method for increasing a yield of a titanium alloy wire, comprising the steps of:
A. straightening the hot-rolled and scalped wire rod with the diameter of 7.8-8.2mm, and clamping the wire rod at the inlet of a rotary forging machine;
B. reducing the diameter of the wire rod with the diameter of 7.8-8.2mm to the diameter of 1.8-2.2mm by adopting a rotary swaging machine;
C. in the reducing process of the step B, when the diameters of the wires are phi 5.8-6.2mm, phi 4.3-4.7mm, phi 3.2-3.6mm and phi 2.4-2.8mm respectively, annealing treatment is carried out by adopting a vacuum annealing furnace;
D. and B, lubricating and cooling the wire by using anti-wear hydraulic oil in the reducing process of the step B.
Preferably, in step a, the wire is under the designation TA1 or TB 14.
Preferably, in the step A, the wire rod with the diameter of 7.8-8.2mm after hot rolling and peeling is free of burrs, pits, scratches and cracks on the surface after vacuum annealing treatment and surface peeling treatment before straightening.
Preferably, in the step A, the straightness of the wire is less than 10mm/m after the wire is straightened by a straightening device equipped at the inlet of the rotary swaging machine.
Preferably, in the step B, in the process of reducing the diameter of the wire rod with the diameter of 7.8-8.2mm to the diameter of 1.8-2.2mm, the wire rod with the diameter of 7.8-8.2mm is reduced to the diameter of 5.8-6.2mm, the diameter of 4.3-4.7mm, the diameter of 3.2-3.6mm and the diameter of 2.4-2.8mm in sequence.
Preferably, in the step C, the ultimate vacuum degree of the vacuum annealing furnace is 2.8x10-2-3.2x10-2Pa, and the pressure increasing rate is less than 5 Pa/h.
Preferably, in step C, the annealing treatment is constant temperature annealing.
More preferably, in the step C, when the mark of the wire is TA1, the temperature of the annealing treatment is 550-600 ℃; when the wire is under the mark TB14, the annealing temperature is 780-830 ℃.
Preferably, in step C, the annealing treatment time is 1-1.5 h.
Preferably, in step C, the annealing treatment is cooled naturally to room temperature along with the furnace.
Preferably, in step D, the antiwear hydraulic oil is under the grade of DTE 46.
The method of the invention fully utilizes the advantage that the material in the working area of the rotary swaging machine is pressed in three directions, and effectively improves the efficiency of axial extension of the material, thereby reducing the number of annealing passes. And (3) carrying out vacuum annealing on the phi 7.8-8.2mm wire rod subjected to hot rolling and peeling for multiple times, and carrying out rotary swaging on the wire rod for multiple times on a rotary swaging machine to reduce the diameter to phi 1.8-2.2 mm. According to the method, the wire drawing powder is not used as a lubricant when the titanium alloy wire is prepared, so that the acid washing process is reduced, and meanwhile, a roller die is used for reducing without using a fixed die, so that the scratch on the surface of the wire is effectively eliminated, and the smoothness of the surface is ensured. Meanwhile, the problems of serious surface oxidation and the like of the material are avoided through cold processing in the reducing process, and the yield of the material is greatly improved.
Detailed Description
The following describes in detail specific embodiments of the present invention. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.
The method for improving the yield of the titanium alloy wire comprises the following steps:
A. straightening the hot-rolled and scalped wire rod with the diameter of 7.8-8.2mm, and clamping the wire rod at the inlet of a rotary forging machine;
B. reducing the diameter of the wire rod with the diameter of 7.8-8.2mm to the diameter of 1.8-2.2mm by adopting a rotary swaging machine;
C. in the reducing process of the step B, when the diameters of the wires are phi 5.8-6.2mm, phi 4.3-4.7mm, phi 3.2-3.6mm and phi 2.4-2.8mm respectively, annealing treatment is carried out by adopting a vacuum annealing furnace;
D. and B, lubricating and cooling the wire by using anti-wear hydraulic oil in the reducing process of the step B.
In the method of the present invention, in step a, the wire is a wire of a type conventional in the art. In a preferred embodiment, in step a, the wire is under the designation TA1 or TB 14.
In the method, in the step A, before straightening the hot-rolled and scalped wire rod with the diameter of 7.8-8.2mm, the wire rod obtained after vacuum annealing treatment and surface scalping treatment has no defects such as burrs, pits, scratches, cracks and the like on the surface.
In the method of the invention, in step A, the wire is straightened by a straightening device equipped at the inlet of the rotary swaging machine, and the straightness of the wire is less than 10mm/m, preferably less than 9mm/m, and more preferably less than 8 mm/m.
In the method of the invention, in the step B, in the process of reducing the diameter of the wire rod with the diameter of 7.8-8.2mm to the diameter of 1.8-2.2mm, the wire rods with the diameter of 7.8-8.2mm are reduced to the diameter of 5.8-6.2mm, the diameter of 4.3-4.7mm, the diameter of 3.2-3.6mm and the diameter of 2.4-2.8mm in sequence.
In a preferred embodiment, in the step B, in the process of reducing the wire rod with the diameter of 8mm to the diameter of 2mm, the wire rod with the diameter of 8mm is reduced to the diameter of 6mm, 4.5mm, 3.4mm and 2.6mm in sequence through a plurality of passes.
In the method, in the step C, the ultimate vacuum degree of the vacuum annealing furnace is 2.8x10-2-3.2x10-2Pa; specifically, for example, it may be 2.8x10-2Pa、2.9x10-2Pa、3x10-2Pa、3.1x10-2Pa、3.2x10-2Pa and any value in the range of any two of these point values; preferably, in the step C, the ultimate vacuum degree of the vacuum annealing furnace is 3x10-2Pa. In the step C, the pressure increasing rate of the vacuum annealing furnace is less than 5Pa/h, preferably, the pressure increasing rate of the vacuum annealing furnace is less than 4Pa/h, and more preferably, the pressure increasing rate of the vacuum annealing furnace is less than 3 Pa/h.
In the method of the present invention, in step C, the annealing treatment is constant temperature annealing. In a specific embodiment, the temperature of the annealing treatment is determined according to the grade of the wire rod. In a specific embodiment, when the wire is assigned a designation TA1, the temperature of the annealing treatment is 550-. In another embodiment, when the wire is under the designation TB14, the annealing temperature is 780-830 ℃, specifically, for example, 780 ℃, 790 ℃, 800 ℃, 810 ℃, 820 ℃ or 830 ℃, and preferably, when the wire is under the designation TB14, the annealing temperature is 795-820 ℃.
In the method of the present invention, in step C, the annealing time is 1 to 1.5h, specifically, for example, 1h, 1.1h, 1.2h, 1.3h, 1.4h or 1.5h, and preferably, in step C, the annealing time is 1.2 h.
In a preferred embodiment, in step C, the annealing treatment is cooled naturally with the furnace to room temperature.
In the method of the present invention, in step D, the antiwear hydraulic oil may be antiwear hydraulic oil of a type conventional in the art. In a preferred embodiment, the antiwear hydraulic oil is under the designation DTE 46.
According to the method, the wire drawing powder is not used as a lubricant when the titanium alloy wire is prepared, so that the pickling process is reduced, and meanwhile, a roller die is used for reducing without using a fixed die, so that the scratch on the surface of the wire is effectively eliminated, and the smoothness of the surface is ensured. Meanwhile, the problems of serious surface oxidation and the like of the material are avoided through cold processing in the reducing process, and the yield of the material is greatly improved.
The present invention will be described in detail by way of examples, but the scope of the present invention is not limited thereto.
Example 1
This example illustrates the preparation of a finished phi 2mm TA1 wire.
A. Straightening the hot-rolled and scalped wire rod with the diameter of 8mm by using a straightening device arranged at the inlet of a rotary forging machine until the straightness of the wire rod is less than 10mm/m, and clamping the wire rod at the inlet of the rotary forging machine;
B. reducing the diameter of the wire rod with the diameter of 8mm to 6mm, 4.5mm, 3.4mm, 2.6mm and 2mm by adopting a rotary forging machine in sequence;
C. in the diameter reduction process in the step B, when the diameters of the wires are respectively phi 6mm, phi 4.5mm, phi 3.4mm and phi 2.6mm, annealing treatment is carried out at 600 ℃ by using a vacuum annealing furnace, heat preservation is carried out for 1h, and then the wires are cooled along with the furnace, wherein the ultimate vacuum degree of the vacuum annealing furnace is 3x10-2Pa, the boosting rate is less than 5 Pa/h;
D. in the reducing process of the step B, the wire is lubricated and cooled by using an antiwear hydraulic oil No. DTE 46.
The obtained finished product of TA1 wire rod with the diameter of phi 2mm has smooth surface and no defects such as scratches, pits and the like.
Example 2
This example illustrates the preparation of finished phi 2mm TB14 wire.
A. Straightening the hot-rolled and scalped wire rod with the diameter of 8mm by using a straightening device arranged at the inlet of a rotary forging machine until the straightness of the wire rod is less than 9mm/m, and clamping the wire rod at the inlet of the rotary forging machine;
B. reducing the diameter of the wire rod with the diameter of 8mm to 6mm, 4.5mm, 3.4mm, 2.6mm and 2mm by adopting a rotary forging machine in sequence;
C. in the diameter reduction process in the step B, when the diameters of the wires are phi 6mm, phi 4.5mm, phi 3.4mm and phi 2.6mm respectively, a vacuum annealing furnace is adopted for annealing treatment at 830 ℃, the temperature is kept for 1h, and then the wires are cooled along with the furnace, wherein the ultimate vacuum degree of the vacuum annealing furnace is 3.2x10-2Pa, the boosting rate is less than 4 Pa/h;
D. in the reducing process of the step B, the wire is lubricated and cooled by using an antiwear hydraulic oil No. DTE 46.
The obtained finished product of TB14 wire with the diameter of phi 2mm has smooth surface and no defects such as scratches, pits and the like.
Example 3
A finished phi 2mm TA1 wire was prepared as in example 1, except that in step C, annealing was carried out at 550 ℃ using a vacuum annealing furnace, and furnace cooling was carried out after 1.5 hours of heat preservation. The obtained finished product of TA1 wire rod with the diameter of phi 2mm has smooth surface and no defects such as scratches, pits and the like.
Comparative example 1
A finished Φ 2mm TB14 wire was prepared according to the method of example 2, except that in step C, annealing was performed when the wire diameters were Φ 5.5mm, Φ 4mm, and Φ 2.8 mm. The obtained finished product of TB14 wire with the diameter of phi 2mm has scratches on the surface.
The preferred embodiments of the present invention have been described above in detail, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention, including combinations of various technical features in any other suitable way, and these simple modifications and combinations should also be regarded as the disclosure of the invention, and all fall within the scope of the invention.
Claims (6)
1. The method for improving the yield of the titanium alloy wire is characterized by comprising the following steps of:
A. straightening the hot-rolled and scalped wire rod with the diameter of 7.8-8.2mm, and clamping the wire rod at the inlet of a rotary forging machine;
B. reducing the diameter of the wire rod with the diameter of 7.8-8.2mm to the diameter of 1.8-2.2mm by adopting a rotary swaging machine;
C. in the reducing process of the step B, when the diameters of the wires are phi 5.8-6.2mm, phi 4.3-4.7mm, phi 3.2-3.6mm and phi 2.4-2.8mm respectively, annealing treatment is carried out by adopting a vacuum annealing furnace;
D. b, lubricating and cooling the wire by using anti-wear hydraulic oil in the reducing process of the step B;
wherein, in the step A, the wire is TA1 or TB 14;
in the step C, the ultimate vacuum degree of the vacuum annealing furnace is 2.8x10-2-3.2x10-2Pa, the boosting rate is less than 5 Pa/h;
in the step C, the annealing treatment is constant temperature annealing;
when the mark of the wire is TA1, the temperature of the annealing treatment is 550-600 ℃; when the mark of the wire is TB14, the temperature of the annealing treatment is 780-830 ℃;
in the step C, the time of the annealing treatment is 1-1.5 h.
2. The method according to claim 1, wherein in the step A, the wire rod with the diameter of 7.8-8.2mm after hot rolling and peeling is free of burrs, pits, scratches and cracks on the surface after vacuum annealing treatment and surface peeling treatment before straightening.
3. The method according to claim 1, wherein in step a, the wire is straightened by a straightening device provided at the entry of the rotary swaging machine to a straightness of less than 10 mm/m.
4. The method according to claim 1, wherein in the step B, in reducing the wire rod of Φ 7.8-8.2mm to Φ 1.8-2.2mm, the wire rod of Φ 7.8-8.2mm is reduced to Φ 5.8-6.2mm, Φ 4.3-4.7mm, Φ 3.2-3.6mm and Φ 2.4-2.8mm in this order.
5. The method of claim 1, wherein in step C, the annealing process is cooled down naturally with the furnace to room temperature.
6. The method as claimed in claim 1, wherein in step D, the antiwear hydraulic oil is under the designation DTE 46.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113210448B (en) * | 2021-05-17 | 2022-06-03 | 西北有色金属研究院 | Cold drawing preparation method of TB9 titanium alloy disc wire with lubricating coating |
| CN114522977A (en) * | 2022-02-21 | 2022-05-24 | 西安圣泰金属材料有限公司 | Diameter-changing sizing equipment and method for titanium and titanium alloy wire rods and titanium alloy wire |
| CN116727587B (en) * | 2023-08-11 | 2023-10-27 | 成都先进金属材料产业技术研究院股份有限公司 | TB5 titanium alloy wire and preparation method thereof |
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