CN116532511A - Preparation method for improving surface precision of TB13 titanium alloy wire for spectacle frame - Google Patents
Preparation method for improving surface precision of TB13 titanium alloy wire for spectacle frame Download PDFInfo
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- CN116532511A CN116532511A CN202310586089.3A CN202310586089A CN116532511A CN 116532511 A CN116532511 A CN 116532511A CN 202310586089 A CN202310586089 A CN 202310586089A CN 116532511 A CN116532511 A CN 116532511A
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- 229910001069 Ti alloy Inorganic materials 0.000 title claims abstract description 17
- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- 238000005242 forging Methods 0.000 claims abstract description 69
- 238000005096 rolling process Methods 0.000 claims abstract description 54
- 239000000463 material Substances 0.000 claims abstract description 29
- 238000000034 method Methods 0.000 claims abstract description 27
- 238000004321 preservation Methods 0.000 claims description 25
- 238000010438 heat treatment Methods 0.000 claims description 23
- 230000007547 defect Effects 0.000 claims description 12
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 10
- 229910052719 titanium Inorganic materials 0.000 claims description 10
- 239000010936 titanium Substances 0.000 claims description 10
- 239000000314 lubricant Substances 0.000 claims description 6
- 238000000137 annealing Methods 0.000 claims description 5
- 239000011248 coating agent Substances 0.000 claims description 5
- 238000000576 coating method Methods 0.000 claims description 5
- 238000000227 grinding Methods 0.000 claims description 5
- 239000010720 hydraulic oil Substances 0.000 claims description 5
- 239000013067 intermediate product Substances 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 238000005498 polishing Methods 0.000 claims description 3
- 239000002932 luster Substances 0.000 claims description 2
- 230000001050 lubricating effect Effects 0.000 claims 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 6
- 238000012545 processing Methods 0.000 abstract description 6
- 230000003746 surface roughness Effects 0.000 abstract description 5
- 239000002253 acid Substances 0.000 abstract description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 3
- 239000001257 hydrogen Substances 0.000 abstract description 3
- 229910052739 hydrogen Inorganic materials 0.000 abstract description 3
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 3
- 239000001301 oxygen Substances 0.000 abstract description 3
- 229910052760 oxygen Inorganic materials 0.000 abstract description 3
- 238000005406 washing Methods 0.000 abstract description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 abstract description 2
- 238000010622 cold drawing Methods 0.000 abstract description 2
- 238000005868 electrolysis reaction Methods 0.000 abstract description 2
- 238000005098 hot rolling Methods 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000012360 testing method Methods 0.000 description 27
- 238000005482 strain hardening Methods 0.000 description 5
- 238000005461 lubrication Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 239000003921 oil Substances 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 238000004381 surface treatment Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 2
- 238000005491 wire drawing Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
Classifications
-
- 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
- C22F1/16—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of other metals or alloys based thereon
- C22F1/18—High-melting or refractory metals or alloys based thereon
- C22F1/183—High-melting or refractory metals or alloys based thereon of titanium or alloys based thereon
-
- 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
-
- 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
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/525—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length for wire, for rods
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/02—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working in inert or controlled atmosphere or vacuum
Abstract
The invention discloses a preparation method for improving the surface precision of a TB13 titanium alloy wire for a spectacle frame, which adopts a rotary forging and roller die drawing method to perform cold reducing processing and cold drawing on the TB13 titanium alloy wire so as to improve the surface precision of the TB13 titanium alloy wire. The TB13 cast ingot is prepared into the wire material for the spectacle frame through steps of forging, hot rolling, rotary forging, roller die drawing and the like. The forging cogging and rolling both select large deformation and lower processing temperature, which can effectively ensure that coarse tissues are crushed to a certain extent and internal tissues are improved. The whole process of the wire is free from acid washing and electrolysis, and has no hydrogen increasing, oxygen increasing and nitrogen increasing in the production process, and the purity of the components is high. The rotary forging and the roller die drawing are both cold processing, the cold processed wire product has the characteristic of high dimensional accuracy, the dimensional tolerance of the wire product with the diameter of 2.0mm to 4.9mm can be continuously and stably maintained within the range of 0-0.02mm, and the surface roughness Ra of the wire is less than or equal to 0.5 mu m.
Description
Technical Field
The invention belongs to the technical field of titanium alloy wire preparation, and particularly relates to a preparation method for improving surface accuracy of a TB13 titanium alloy wire for a spectacle frame.
Background
TB13 titanium alloy (Ti-4 Al-22V) is metastable beta-type titanium alloy with excellent comprehensive performance, and is widely applied to the industries of chemical industry, biomedicine, glasses, automobiles and the like due to the characteristics of high strength, good ductility, excellent cold processing performance and the like. Along with the application and popularization of titanium and titanium alloy in the spectacle frame industry, the alloy becomes the preferred material of high-end spectacle frame products.
The traditional wire drawing reducing method mainly adopts a fixed die hot drawing mode. The mode is extremely easy to cause the wire to absorb harmful elements such as nitrogen, hydrogen, oxygen and the like in the air in a heated state, and the material performance is reduced. When drawing, a very large sliding friction force exists between the fixed die and the wire, and the die can be worn, so that the dimensional tolerance of the wire is increased and the surface of the wire is scratched, and a coherent quality defect is formed. In addition, after the wire drawing is completed, electrolytic polishing or acid washing must be performed to remove graphite or a phosphorylated lubricant on the surface of the wire, which causes high energy consumption and high pollution in wire preparation.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims at the technical problems that the traditional wire diameter reduction adopts a fixed die hot drawing mode to cause the wire to absorb harmful elements in the air in a heated state, the material performance is reduced, the dimensional tolerance of the wire is increased, the surface of the wire is strained and the like, and adopts rotary forging and roller die drawing methods to perform cold diameter reduction processing and cold drawing on the TB13 titanium alloy wire, thereby improving the surface precision of the TB13 titanium alloy wire.
Cold working is an important way to improve performance by refining the structure. The rotary forging has the characteristics of simple replacement of forging dies, smooth cold-working surface, high machining dimensional accuracy and the like. The roller die drawing has the characteristics of small rolling friction force, high surface quality of the wire, large single-pass deformation and uniform material organization after deformation.
In order to achieve the above object, the present invention provides a method for improving the surface accuracy of a TB13 titanium alloy wire for a spectacle frame, comprising the steps of:
(1) forging: and removing the TB13 cast ingot through peeling and riser to obtain a billet. The forging cogging adopts two-fire cogging: the first fire forging adopts a three-upsetting and three-drawing mode, the initial forging temperature is 1050-1150 ℃, the heat preservation is carried out for 3 hours, the final forging temperature is more than 700 ℃, and the upsetting and drawing deformation is 65-70%; the second fire forging adopts a two-upsetting two-drawing mode, the initial forging temperature is 900-1000 ℃, the heat preservation is carried out for 3 hours, the final forging temperature is more than 600 ℃, and the deformation of upsetting and drawing is 60-65%.
(2) Rolling: polishing the surface of the titanium blank forged in the step (1) until the titanium blank has metallic luster and no macroscopic defect, and putting the titanium blank into a heating furnace for heating. The coil rod is obtained by rolling a two-fire rolled blank: the first fire rolling temperature is 850-900 ℃, the heat preservation is carried out for 2 hours, the rolling speed is 2m/s, the final rolling size phi is 60mm, the rolling passes are 13 times, and the rolling deformation is 75%; the second-time rolling temperature is 800-850 ℃, the heat preservation is carried out for 2 hours, the rolling pass is 10 times, the final rolling size phi 10mm, and the rolling deformation is 97%.
(3) And (3) rotary forging: firstly, carrying out a rounding-peeling process on the wire rods obtained in the step (2): wherein, the rounding is carried out by adopting a hot drawing machine at 800 ℃ to remove the ear defect on the surface of the material, and the size of the rounded material is phi 9.5mm; removing oxide skin and surface defects on the surface of a material by adopting a centerless grinding lathe, wherein the size of the peeled material is phi 9.0mm; then reducing the diameter of the wire rod with the diameter of 9.0mm to the diameter of 5.5mm by adopting a rotary forging machine through 7 passes, wherein the diameter of each pass is reduced by 0.5mm, and obtaining an intermediate wire rod; the hydraulic oil is used for lubrication in the rotary forging process, the rotary forging speed is not more than 0.3/min, and heat treatment is not needed in the rotary forging process.
(4) And (3) heat treatment: the intermediate product wire material obtained in the step (3) has a work hardening phenomenon, and in order to facilitate the subsequent roller die drawing, vacuum annealing heat treatment is required; the heat treatment temperature is 750-830 ℃, the heat preservation time is 0.5-1 h, and the cooling mode adopts water cooling.
(5) Drawing a roller die: uniformly coating a water-soluble lubricant on the surface of the annealed wire material in the step (4), and then carrying out roller die drawing; in the process of reducing the diameter of the wire rod with the diameter of 5.5mm to the diameter of 1.8-2.0mm, the wire rod with the diameter of 5.5mm is sequentially reduced to the diameter of 4.3-phi
4.9mm, phi 3.5-phi 3.9mm and phi 2.0-phi 2.4mm, and no heat treatment is needed in the roller die drawing process.
Compared with the prior art, the invention has the beneficial effects that:
the forging cogging and rolling both select large deformation and lower processing temperature, which can effectively ensure that coarse tissues are crushed to a certain extent and internal tissues are improved. The whole process of the wire is free from acid washing and electrolysis, and has no hydrogen increasing, oxygen increasing and nitrogen increasing in the production process, and the purity of the components is high. The rotary forging and the roller die drawing both belong to cold working, the cold working wire product has the characteristic of high dimensional accuracy, the dimensional tolerance of the wire product with the diameter of 2.0mm to 4.9mm can be continuously and stably maintained within the range of 0-0.02mm, and the surface roughness Ra of the wire is less than or equal to 0.5 mu m.
Drawings
FIG. 1 is a photograph of the transverse microstructure of a phi 4.92mm gauge drawn TB13 wire prepared in example 1;
FIG. 2 is a photograph of the longitudinal microstructure of a phi 4.92mm gauge drawn TB13 wire prepared in example 1;
FIG. 3 is a photograph of the transverse microstructure of a phi 3.92mm gauge drawn TB13 wire prepared in example 2;
FIG. 4 is a photograph of the longitudinal microstructure of a phi 3.92mm gauge drawn TB13 wire prepared in example 2;
FIG. 5 is a photograph of the transverse microstructure of a phi 2.43mm gauge drawn TB13 wire prepared in example 3;
FIG. 6 is a photograph of the longitudinal microstructure of a phi 2.43mm gauge drawn TB13 wire prepared in example 3;
FIG. 7 is a photograph showing the surface state of a phi 4.92mm gauge drawn TB13 wire, as prepared in example 1, after upsetting;
FIG. 8 is a photograph of a surface state of a phi 3.92mm gauge drawn TB13 wire, as prepared in example 2, after upsetting;
fig. 9 is a photograph of a surface state of a phi 2.43mm gauge drawn state TB13 wire upset produced in example 3.
Detailed Description
The invention is further illustrated below in connection with specific examples, but is not limited in any way. For the sake of avoiding redundancy, the raw materials in the following examples are all commercially available unless specifically stated, and the quality grades are all industrial grades; the methods used are conventional methods unless otherwise specified.
Example 1
A preparation method for improving the surface precision of TB13 titanium alloy wires for spectacle frames comprises the following steps:
(1) and forging and cogging by adopting a TB13 cast ingot with uniform components and 300mm specification and a 2000t oil press. The first forging temperature is 1050 ℃, the heat preservation is carried out for 3 hours, the final forging temperature is 750 ℃, and the upsetting and drawing deformation is 65%; and forging by a second fire, wherein the initial forging temperature is 950 ℃, the heat preservation is carried out for 3 hours, the final forging temperature is 650 ℃, and the deformation of upsetting and drawing is 60%.
(2) After the surface treatment of the titanium blank forged in the step (1), a reciprocating rolling mill is used: the first hot rolling temperature is 850 ℃, the heat preservation is carried out for 2 hours, the rolling speed is 2m/s, the final rolling size phi is 60mm, the rolling pass is 13 times, and the rolling deformation is 75%; the second-time rolling temperature is 800 ℃, the heat preservation is carried out for 2 hours, the rolling pass is carried out for 10 times, the final rolling size phi is 10mm, and the rolling deformation is 97%.
(3) And (3) carrying out a rounding-peeling process on the wire rod in the step (2): wherein, the rounding is carried out by adopting a hot drawing machine at 800 ℃ to remove the ear defect on the surface of the material, and the size of the rounded material is phi 9.5mm; removing oxide skin and surface defects on the surface of a material by adopting a centerless grinding lathe, wherein the size of the peeled material is phi 9.0mm; then, a rotary forging machine is adopted, the diameter of the wire rod with the diameter of 9.0mm is reduced to be phi 5.5mm through 7 passes and each pass is reduced to be 0.5 mm. Hydraulic oil is used for lubrication in the rotary forging process. The wire feeding speed of the rotary forging is 0.3/min, and heat treatment is not needed in the rotary forging process.
(4) And (3) performing vacuum annealing heat treatment on the intermediate product wire material obtained in the step (3), wherein the heat treatment temperature is 800 ℃, the heat preservation time is 0.8hh, and the cooling mode adopts water cooling.
(5) And (3) uniformly coating a water-soluble lubricant on the surface of the annealed wire material in the step (4), and then carrying out roller die drawing. The wire with the diameter of 5.5mm is reduced to the diameter of 4.92mm by a continuous drawing roller die drawing machine, and the deformation is 19.9%.
As shown in Table 1, the dimension test of the drawn TB13 wire rod with the specification of phi 4.92mm prepared in example 1 shows that the precision of the wire rod is high, the tolerance is within 0-0.02mm, and the surface roughness Ra is less than or equal to 0.5 mu m.
TABLE 1 phi 4.92mm gauge drawn TB13 wire size detection results
| Test point | Test point 1 | Test point 2 | Test point 3 | Test point 4 | Test point 5 | Test point 6 | Test point 7 |
| Size/mm | Φ4.926 | Φ4.922 | Φ4.913 | Φ4.915 | Φ4.916 | Φ4.910 | Φ4.922 |
| Roughness/. Mu.m | 0.456 | 0.434 | 0.471 | 0.452 | 0.485 | 0.456 | 0.472 |
As shown in figures 1-2, the transverse microstructure and the longitudinal microstructure of the drawn TB13 wire rod with the specification of phi 4.92mm prepared in the example 1 can be seen from figures 1-2, the grains of the wire rod are uniform and fine, the grain size is about 10 grades, and the longitudinal streamline is obvious. Fig. 7 shows a state of the upset rear surface of a drawn TB13 wire of Φ4.92mm, and it can be seen from fig. 7 that the ratio of the post-forging height to the pre-forging height is 1:5, no crack exists on the surface of the sample.
Example 2
A preparation method for improving the surface precision of TB13 titanium alloy wires for spectacle frames comprises the following steps:
(1) and forging and cogging by adopting a TB13 cast ingot with uniform components and a phi 350mm specification and a 2000t oil press. The first forging temperature is 1150 ℃, the heat preservation is carried out for 3 hours, the final forging temperature is 780 ℃, and the deformation of upsetting and drawing is 68%; and forging by a second fire, wherein the initial forging temperature is 1000 ℃, the heat preservation is carried out for 3 hours, the final forging temperature is 680 ℃, and the deformation of upsetting and drawing is 63%.
(2) And (3) performing surface treatment on the forged titanium blank in the step (1), and using a reciprocating rolling mill. The first fire rolling temperature is 900 ℃, the heat preservation is carried out for 2 hours, the rolling speed is 2m/s, the final rolling size phi is 60mm, the rolling passes are 13 times, and the rolling deformation is 75%; the second-time rolling temperature is 850 ℃, the heat preservation is carried out for 2 hours, the rolling pass is carried out for 10 times, the final rolling size phi is 10mm, and the rolling deformation is 97%.
(3) And (3) carrying out a rounding-peeling process on the wire rod in the step (2): wherein, the rounding is carried out by adopting a hot drawing machine at 800 ℃ to remove the ear defect on the surface of the material, and the size of the rounded material is phi 9.5mm; removing oxide skin and surface defects on the surface of a material by adopting a centerless grinding lathe, wherein the size of the peeled material is phi 9.0mm; then, a rotary forging machine is adopted, the diameter of the wire rod with the diameter of 9.0mm is reduced to be phi 5.5mm through 7 passes and each pass is reduced to be 0.5 mm. Hydraulic oil is used for lubrication in the rotary forging process, the wire feeding speed of rotary forging is 0.2/min, and heat treatment is not needed in the rotary forging process.
(4) And (3) performing vacuum annealing heat treatment on the intermediate product wire material obtained in the step (3), wherein the heat treatment temperature is 750 ℃, the heat preservation time is 1h, and the cooling mode adopts water cooling.
(5) And (3) uniformly coating a water-soluble lubricant on the annealed wire in the step (4), and then carrying out roller die drawing. The wire with the diameter of phi 5.5mm is reduced to the diameter of phi 3.92mm by a continuous drawing roller die drawing machine, and the deformation is 49.2 percent.
As shown in Table 2, the dimension test of the drawn TB14 wire rod with the specification of phi 3.92mm prepared in example 2 shows that the precision of the wire rod is high, the tolerance is within 0-0.02mm, and the surface roughness Ra is less than or equal to 0.5 mu m.
TABLE 2 phi 3.92mm gauge drawn TB13 wire size detection results
| Test point | Test point 1 | Test point 2 | Test point 3 | Test point 4 | Test point 5 | Test point 6 | Test point 7 |
| Size/mm | Φ3.925 | Φ3.928 | Φ3.915 | Φ3.918 | Φ3.912 | Φ3.911 | Φ3.921 |
| Roughness/. Mu.m | 0.445 | 0.483 | 0.476 | 0.456 | 0.487 | 0.446 | 0.481 |
As shown in figures 3-4, the transverse microstructure and the longitudinal microstructure of the drawn TB13 wire rod with the specification of phi 3.92mm prepared in the example 2 are shown in figures 3-4, the grains of the wire rod are uniform and fine, the grain size is about 10 grades, and the longitudinal streamline is obvious. Fig. 8 shows a post-upsetting surface state of a drawn TB13 wire of Φ4.92mm, and as can be seen from fig. 8, the ratio of post-forging height to pre-forging height is 1:5, no crack exists on the surface of the sample.
Example 3
A preparation method for improving the surface precision of TB13 titanium alloy wires for spectacle frames comprises the following steps:
(1) and forging and cogging by adopting a TB13 cast ingot with uniform components and a phi 400mm specification and a 2000t oil press. The first forging temperature is 1150 ℃, the heat preservation is carried out for 3 hours, the final forging temperature is 800 ℃, and the deformation of upsetting and drawing is 70%; and forging by a second fire, wherein the initial forging temperature is 1050 ℃, the heat preservation is carried out for 3 hours, the final forging temperature is 700 ℃, and the deformation of upsetting and drawing is 65%.
(2) And (3) performing surface treatment on the forged titanium blank in the step (1), and using a reciprocating rolling mill. The first fire rolling temperature is 900 ℃, the heat preservation is carried out for 2 hours, the rolling speed is 2m/s, the final rolling size phi is 60mm, the rolling passes are 13 times, and the rolling deformation is 75%; the second-time rolling temperature is 850 ℃, the heat preservation is carried out for 2 hours, the rolling pass is carried out for 10 times, the final rolling size phi is 10mm, and the rolling deformation is 97%.
(3) And (3) carrying out a rounding-peeling process on the wire rod in the step (2): wherein, the rounding is carried out by adopting a hot drawing machine at 800 ℃ to remove the ear defect on the surface of the material, and the size of the rounded material is phi 9.5mm; removing oxide skin and surface defects on the surface of a material by adopting a centerless grinding lathe, wherein the size of the peeled material is phi 9.0mm; then, a rotary forging machine is adopted, the diameter of the wire rod with the diameter of 9.0mm is reduced to be phi 5.5mm through 7 passes and each pass is reduced to be 0.5 mm. Hydraulic oil is used for lubrication in the rotary forging process, the rotary forging wire feeding speed is 0.1/min, and heat treatment is not needed in the rotary forging process.
(4) And (3) performing vacuum annealing heat treatment on the intermediate product wire material obtained in the step (3), wherein the heat treatment temperature is 830 ℃, the heat preservation time is 0.5h, and the cooling mode adopts water cooling.
(5) And (3) uniformly coating a water-soluble lubricant on the annealed wire in the step (4), and then carrying out roller die drawing. The wire with the diameter of phi 5.5mm is reduced to the diameter of phi 2.43mm by using a continuous drawing roller die drawing machine through three passes, and the deformation is 80.4%.
As shown in Table 3, the dimension test of the drawn TB13 wire rod with the specification of phi 2.43mm prepared in example 3 shows that the precision of the wire rod is high, the tolerance is within 0-0.02mm, and the surface roughness Ra is less than or equal to 0.5 mu m.
TABLE 3 Phi 2.43mm gauge drawn TB13 wire size detection results
| Test point | Test point 1 | Test point 2 | Test point 3 | Test point 4 | Test point 5 | Test point 6 | Test point 7 |
| Size/mm | Φ2.436 | Φ2.438 | Φ2.431 | Φ2.436 | Φ2.421 | Φ2.427 | Φ2.424 |
| Roughness/. Mu.m | 0.455 | 0.481 | 0.473 | 0.466 | 0.477 | 0.432 | 0.484 |
As shown in figures 5-6, the transverse microstructure and the longitudinal microstructure of the drawn TB13 wire rod with the specification of phi 2.43mm prepared in the example 3 are shown in figures 5-6, the grains of the wire rod are uniform and fine, the grain size is about 10 grades, and the longitudinal streamline is obvious. Fig. 9 shows a post-upsetting surface state of a drawn TB13 wire of Φ4.92mm, and as can be seen from fig. 9, the ratio of post-forging height to pre-forging height is 1:5, no crack exists on the surface of the sample.
Many possible variations and modifications of the disclosed technology can be made by anyone skilled in the art without departing from the scope of the technology, or the technology can be modified to be equivalent. Therefore, any simple modification, equivalent variation and modification of the above embodiments according to the technical substance of the present invention shall still fall within the scope of the technical solution of the present invention.
Claims (2)
1. The preparation method for improving the surface precision of the TB13 titanium alloy wire for the spectacle frame is characterized by comprising the following steps of:
(1) forging: removing a cast TB13 ingot through peeling and a riser to obtain a billet, and forging and cogging by adopting two-fire cogging: the first fire forging adopts a three-upsetting and three-drawing mode, the initial forging temperature is 1050-1150 ℃, the heat preservation is carried out for 3 hours, the final forging temperature is more than 700 ℃, and the upsetting and drawing deformation is 65-70%; the second fire forging adopts a two-upsetting two-drawing mode, the initial forging temperature is 900-1000 ℃, the heat preservation is carried out for 3 hours, the final forging temperature is more than 600 ℃, and the upsetting and drawing deformation is 60-65%;
(2) rolling: polishing the surface of the titanium blank forged in the step (1) until the titanium blank has metallic luster and no macroscopic defect, and putting the titanium blank into a heating furnace for heating; the coil rod is obtained by rolling a two-fire rolled blank: the first fire rolling temperature is 850-900 ℃, the heat preservation is carried out for 2 hours, the rolling speed is 2m/s, the final rolling size phi is 60mm, the rolling passes are 13 times, and the rolling deformation is 75%; the second-time rolling temperature is 800-850 ℃, the heat preservation is carried out for 2 hours, the rolling pass is 10 times, the final rolling size phi 10mm, and the rolling deformation is 97%;
(3) and (3) rotary forging: firstly, carrying out a rounding-peeling process on the wire rods obtained in the step (2): wherein, the rounding is carried out by adopting a hot drawing machine at 800 ℃, and the size of the rounded round is phi 9.5mm; peeling by adopting a centerless grinding lathe, wherein the peeled size is phi 9.0mm; then reducing the diameter of the wire rod with the diameter of 9.0mm to the diameter of 5.5mm by adopting a rotary forging machine through 7 passes, wherein the diameter of each pass is reduced by 0.5mm, and obtaining an intermediate wire rod;
(4) and (3) heat treatment: performing vacuum annealing heat treatment on the intermediate product wire material obtained in the step (3), wherein the heat treatment temperature is 750-830 ℃, the heat preservation time is 0.5-1 h, and the cooling mode adopts water cooling;
(5) drawing a roller die: uniformly coating a water-soluble lubricant on the surface of the annealed wire material in the step (4), and then carrying out roller die drawing; in the process of reducing the diameter of the wire rod with the diameter of 5.5mm to the diameter of 1.8-2.0mm, the wire rod with the diameter of 5.5mm is sequentially reduced to the diameter of 4.3-phi
4.9mm, phi 3.5-phi 3.9mm and phi 2.0-phi 2.4mm, and no heat treatment is needed in the roller die drawing process.
2. The method of claim 1, wherein the step (3) is performed by lubricating with hydraulic oil during the swaging process, the swaging rate is not more than 0.3/min, and no heat treatment is required during the swaging process.
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| 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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