Titanium alloy wire for eyeglass frames

Abstract

The application belongs to the field of wire preparation, and particularly relates to a titanium alloy wire preparation method for glasses frames by cold drawing, which comprises the following steps: forging and blooming, rolling: taking the titanium blank obtained after the forging and blooming, polishing, heating and twice blooming, the first rolling speed is 2.2 m / s, the second rolling speed is 2.5 m / s, and the wire rod is obtained after the rolling; taking the treated wire rod, smearing water-soluble lubricant on the surface, carrying out heat treatment annealing after starting drawing, repeating multiple times, obtaining the titanium alloy wire, and carrying out ultrasonic cleaning, heat treatment and cooling to obtain the finished product. In the application, large deformation and low processing temperature are selected for the forging and blooming and the rolling, which can effectively ensure that the coarse organization is broken to a certain extent, the internal organization is improved, and the plasticity is improved. The wire is free of pickling and electrolysis in the whole process, and the production process is green and environmentally friendly. No hydrogen, oxygen and nitrogen are increased in the production process, and the purity of the composition is high.

Description

Technical Field

[0001] This invention belongs to the field of wire preparation, and specifically relates to a method for cold drawing titanium alloy wire for eyeglass frames. Background Technology

[0002] TB13 (Ti-4Al-22V) is a β-type titanium alloy with low density, high specific strength, strong corrosion resistance, excellent cold working performance and superelasticity. Therefore, it is mainly used in many fields such as medical, electronic and eyeglass frames.

[0003] In recent years, domestically produced TB13 titanium alloy wire has been used in the market. However, compared with imported products, the quality of TB13 titanium alloy wire products lags behind in terms of batch stability and microstructure uniformity.

[0004] The traditional wire drawing process for TB13 titanium alloy wire is: hot drawing with a fixed die, heat treatment, pickling, and polishing. This process is mostly used to deliver wire rods and machined surfaces. The problems with the TB13 wire produced by the above hot drawing process are: (1) the fixed die drawing speed is slow, the single-pass diameter reduction is small, the processing steps are long, and the production efficiency is low; (2) the heating temperature during hot drawing is 700℃~800℃, which easily causes the wire to absorb harmful elements such as nitrogen, hydrogen, and oxygen from the air under heat, reducing the consistency of material properties; (3) there is a very large sliding friction between the fixed die and the wire during drawing, which easily leads to larger dimensional tolerances and surface scratches, forming continuous quality defects; (4) after the wire is drawn, electrolytic polishing or pickling must be used to remove the graphite or phosphoric acid lubricant from the wire surface, which will result in high energy consumption and high pollution in wire preparation.

[0005] Roller drawing, as a cold drawing method, transforms most of the sliding friction between the material and the die hole during fixed-die drawing into rolling friction of the bearing, thereby significantly reducing tensile friction and making drawing more labor-saving and efficient. It also offers advantages such as high-speed diameter reduction, high total compression ratio, high dimensional accuracy, and good microstructure uniformity. Therefore, to address the problems existing in domestically produced TB13 titanium alloy wire, improve the production efficiency and yield of TB13 titanium alloy wire, and meet the requirements of the Chinese civilian market for TB13 titanium alloy materials, this invention employs a roller drawing method to prepare TB13 titanium alloy wire. Summary of the Invention

[0006] To address the above problems, the present invention provides a method for cold drawing titanium alloy wire for eyeglass frames, comprising:

[0007] Forging and blanking: TB13 ingots are selected, and after the risers are removed, forging and blanking are carried out. The forging and blanking method is two-fire blanking.

[0008] Rolling: Take the titanium billet obtained after forging, grind, heat and roll it in two stages. The first rolling speed is 2.2 m / s and the second rolling speed is 2.5 m / s. After rolling, wire rod is obtained.

[0009] Rounding and peeling: Take the wire rod and round it. The rounding is hot-drawn rounding at a temperature of 780℃. After rounding, peel the wire rod to obtain the intermediate product.

[0010] Heat treatment and annealing: The rounded and peeled wire rods are subjected to heat treatment and annealing. The heat treatment temperature is 750℃-800℃ and the annealing method is spray water cooling.

[0011] Roll mill drawing: Take the wire rod that has been heat-treated and annealed, apply water-soluble lubricant to the surface, and start drawing. The deformation of a single drawing pass is 20-25%, the drawing speed is 1.6~2.5m / s, and after 4-5 drawing passes, perform heat treatment and annealing. Repeat the alternating cycle of roller mill drawing and heat treatment and annealing multiple times to obtain titanium alloy wire.

[0012] The titanium alloy wire is subjected to ultrasonic cleaning, heat treatment, and cooling to obtain the finished product.

[0013] A further preferred technical solution is: the two-fire billet preparation includes:

[0014] First forging: initial forging temperature 1050~1150℃, holding temperature for 3 hours, final forging temperature >700℃, upsetting and drawing deformation amount 65~70%;

[0015] Second forging: initial forging temperature 900~1000℃, holding temperature for 3 hours, final forging temperature >600℃, upsetting and drawing deformation amount 60~65%.

[0016] The further preferred technical solution is as follows: first rolling, temperature 850~920℃, holding time 2h, rolling speed 2.2m / s, final rolling size Φ60mm, 13 rolling passes, rolling deformation 75%.

[0017] The further preferred technical solution is: a second rolling process, a rolling temperature of 830~900℃, a holding time of 2h, a rolling speed of 2.5m / s, 8 rolling passes, a final rolling size of Φ16mm, and a rolling deformation of 92%.

[0018] The further preferred technical solution is: rounding, specifically, using a hot drawing machine at 780℃ to perform hot drawing and rounding to remove ear defects on the material surface, and the size of the wire rod after rounding is Φ15.5mm.

[0019] The further preferred technical solution is: peeling, specifically using a centerless grinding lathe to remove oxide scale and surface defects from the material surface, and the size of the intermediate product after peeling is Φ14.5mm.

[0020] The further preferred technical solution is as follows: heat treatment, using an online protective atmosphere heat treatment furnace, heat treatment temperature of 750℃~800℃, wire travel speed of 5~8m / min, annealing method using spray water cooling, and protective gas of 99.999% high-purity argon.

[0021] A further preferred technical solution is that the titanium alloy wire has a size of Φ1.8-2.0mm.

[0022] The further preferred technical solution is: ultrasonic cleaning, with a heating temperature of 50~60℃, a cleaning time of 2~3h, an ultrasonic frequency of 3~5kHz, and a water-based cleaning agent as the cleaning medium.

[0023] The further preferred technical solution is as follows: for the heat treatment of the finished product, an online protective atmosphere heat treatment furnace is used, the heat treatment temperature is 730℃~780℃, the wire travel speed is 4~6m / min, the cooling method is spray water cooling, and the protective gas is 99.999% high-purity argon.

[0024] The beneficial effects of this invention are as follows: 1. Both the forging and rolling processes use large deformation and low processing temperatures, which can effectively ensure that the coarse structure is broken to a certain extent, the internal structure is improved, and the plasticity is increased.

[0025] 2. The entire process of producing the silk material is free of acid washing and electrolysis, making the production process green and environmentally friendly. No hydrogen, oxygen, or nitrogen is added during production, resulting in high purity of the components.

[0026] 3. The heat treatment adopts an online protective atmosphere furnace. Compared with the commonly used vacuum heat treatment furnace, this method is low in cost, low in energy efficiency, high in efficiency, and easy to operate and maintain.

[0027] 4. Compared with traditional hot drawing, the present invention uses roller drawing, which significantly improves the drawing speed, shortens the production cycle, and eliminates the heating process, reducing the production cost to 30% of the original cost, while also ensuring the continuity and efficiency of subsequent wire processing.

[0028] 5. The wire products drawn by the roller die of this invention have excellent comprehensive performance. Cold working can refine the wire grains, with a grain size of up to grade 8; improve the cold deformation performance of TB13 wire, with 80% compression deformation without cracking; and also ensure the consistency and stability of various mechanical properties of the wire.

[0029] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures pointed out in the description, claims and drawings. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 The microstructure of titanium alloy wire according to Embodiment 1 of the present invention is shown;

[0032] Figure 2 The microstructure of the titanium alloy wire according to Embodiment 2 of the present invention is shown;

[0033] Figure 3 The microstructure of titanium alloy wire according to Embodiment 3 of the present invention is shown. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] Example 1

[0036] Step 1: Use 300mm TB13 ingots with uniform composition for forging on a 2000t hydraulic press. The first forging temperature is 1080℃, held for 3 hours, and the final forging temperature is >700℃, with an upsetting and elongation deformation of 68%. The second forging temperature is 950℃, held for 3 hours, and the final forging temperature is >600℃, with an upsetting and elongation deformation of 65%.

[0037] Step 2: After surface treatment, the titanium billet forged in Step 1 is rolled using a reciprocating rolling mill. The first rolling pass is at a temperature of 850℃, held for 2 hours, with a rolling speed of 2 m / s, a final rolled size of Φ60 mm, 13 rolling passes, and a rolling deformation of 75%. The second rolling pass is at a temperature of 800℃, held for 2 hours, with a rolling speed of 2.5 m / s, 8 rolling passes, a final rolled size of Φ16 mm, and a rolling deformation of 92%.

[0038] Step 3: Perform a rounding and peeling process on the wire rod from Step 2. The size after peeling is Φ14.5mm, and the surface of the wire rod is smooth.

[0039] Step 4: The intermediate wire obtained in Step 3 is subjected to annealing heat treatment. The wire rod is processed in an online protective atmosphere heat treatment furnace. The heat treatment temperature should be 780℃, the wire travel speed should be 6m / min, the cooling method is spray water cooling, and the protective gas is 99.999% high-purity argon.

[0040] Step 5: Apply a water-soluble lubricant evenly to the annealed wire from Step 4, and then perform roller drawing. Use a continuous roller drawing machine to reduce the diameter of the Φ14.5mm wire rod to Φ7.50mm, with each reduction of diameter occurring once every four passes, followed by one heat treatment annealing step from Step 4.

[0041] Step 6: The TB13 titanium alloy wire drawn to Φ7.50mm in Step 5 is then ultrasonically cleaned. The ultrasonic cleaning temperature is 50℃, the cleaning time is 2 hours, the ultrasonic frequency is 3kHz, and the cleaning medium is water-based cleaning agent.

[0042] Step 7: Perform solution treatment on the cleaned wire from Step 6. Use an online protective atmosphere heat treatment furnace with a heat treatment temperature of 780℃, a wire travel speed of 4m / min, and a water spray cooling method. The protective gas is 99.999% high-purity argon.

[0043] The mechanical properties of the Φ7.50mm drawn TB13 wire prepared in Example 1 are shown in Table 1. The microstructure of the titanium alloy wire of the Φ7.50mm TB13 wire is as follows: Figure 1 As shown.

[0044] Table 1. Test results of mechanical properties of TB13 wire in drawn state with a specification of 7.50mm

[0045]

[0046] Example 2

[0047] Step 1: Using TB13 ingots with uniform composition and Φ350mm specifications, forging is performed using a 2000t hydraulic press. The first forging temperature is 1100℃, held for 3 hours, and the final forging temperature is >700℃, with an upsetting and elongation deformation of 68%. The second forging temperature is 970℃, held for 3 hours, and the final forging temperature is >600℃, with an upsetting and elongation deformation of 65%.

[0048] Step 2: After surface treatment, the titanium billet forged in Step 1 is rolled using a reciprocating rolling mill. The first rolling pass is at a temperature of 870℃, held for 2 hours, with a rolling speed of 2 m / s, a final rolled size of Φ60 mm, 13 rolling passes, and a rolling deformation of 75%. The second rolling pass is at a temperature of 820℃, held for 2 hours, with a rolling speed of 2.5 m / s, 8 rolling passes, a final rolled size of Φ16 mm, and a rolling deformation of 92%.

[0049] Step 3: Perform a rounding and peeling process on the wire rod from Step 2. The size after peeling is Φ14.5mm, and the surface of the wire rod is smooth.

[0050] Step 4: The intermediate wire obtained in Step 3 is subjected to annealing heat treatment. The wire rod is processed in an online protective atmosphere heat treatment furnace. The heat treatment temperature should be 780℃, the wire travel speed should be 6m / min, the cooling method is spray water cooling, and the protective gas is 99.999% high-purity argon.

[0051] Step 5: Apply a water-soluble lubricant evenly to the annealed wire from Step 4, and then perform roller drawing. Use a continuous roller drawing machine to reduce the diameter of the Φ14.5mm wire rod to Φ6.00mm, with each reduction of diameter occurring once every four passes, followed by one heat treatment annealing step from Step 4.

[0052] Step 6: The TB13 titanium alloy wire drawn to Φ6.00mm in Step 5 is then ultrasonically cleaned. The ultrasonic cleaning temperature is 55℃, the cleaning time is 2.5h, the ultrasonic frequency is 4kHz, and the cleaning medium is water-based cleaning agent.

[0053] Step 7: Perform solution treatment on the cleaned wire from Step 6. Use an online protective atmosphere heat treatment furnace, with a heat treatment temperature of 795℃, a wire travel speed of 4.5m / min, and a water spray cooling method. The protective gas is 99.999% high-purity argon.

[0054] The mechanical properties of the Φ6.00mm drawn TB13 wire prepared in Example 2 are shown in Table 2. The microstructure is as follows: Figure 2 As shown.

[0055] Table 2 Test results of mechanical properties of TB13 wire in solution-treated state with a diameter of 6.00mm

[0056]

[0057] Example 3

[0058] Step 1: Use TB14 ingots with uniform composition and a Φ400mm specification for forging and billet preparation using a 2000t hydraulic press. The first forging process begins at 1150℃, holds for 3 hours, and ends at a final forging temperature >700℃, with a deformation of 65% during upsetting and drawing. The second forging process begins at 1000℃, holds for 3 hours, and ends at a final forging temperature >600℃, with a deformation of 60% during upsetting and drawing.

[0059] Step 2: After surface treatment, the titanium billet forged in Step 1 is rolled using a reciprocating rolling mill. The first rolling pass is at a temperature of 880℃, held for 2 hours, with a rolling speed of 2 m / s, a final rolled size of Φ60 mm, 13 rolling passes, and a rolling deformation of 75%. The second rolling pass is at a temperature of 840℃, held for 2 hours, with 10 rolling passes, a final rolled size of Φ10 mm, and a rolling deformation of 97%.

[0060] Step 3: Perform a rounding and peeling process on the wire rod from Step 2. The size after peeling is Φ14.5mm, and the surface of the wire rod is smooth.

[0061] Step 4: The intermediate wire obtained in Step 3 is subjected to annealing heat treatment. The wire rod is processed in an online protective atmosphere heat treatment furnace. The heat treatment temperature should be 780℃, the wire travel speed should be 6m / min, the cooling method is spray water cooling, and the protective gas is 99.999% high-purity argon.

[0062] Step 5: Apply a water-soluble lubricant evenly to the annealed wire from Step 4, and then perform roller drawing. Use a continuous roller drawing machine to reduce the diameter of the Φ14.5mm wire rod to Φ4.00mm, with each reduction of diameter occurring once every four passes, followed by one heat treatment annealing step from Step 4.

[0063] Step 6: The TB13 titanium alloy wire drawn to Φ4.00mm in Step 5 is then ultrasonically cleaned. The ultrasonic cleaning temperature is 60℃, the cleaning time is 3 hours, the ultrasonic frequency is 5kHz, and the cleaning medium is water-based cleaning agent.

[0064] Step 7: Perform solution treatment on the cleaned wire from Step 6. Use an online protective atmosphere heat treatment furnace, with a heat treatment temperature of 810℃, a wire travel speed of 5.5m / min, and a water spray cooling method. The protective gas is 99.999% high-purity argon.

[0065] The mechanical properties of the Φ4.00mm drawn TB13 wire prepared in Example 3 are shown in Table 3. The microstructure is as follows: Figure 3 As shown.

[0066] Table 3. Test results of mechanical properties of TB13 in drawn state with a diameter of Φ4.00mm.

[0067]

[0068] From Table 1-3 and Figure 1-3 As can be seen, the mechanical properties of the filament are consistent and stable, the microstructure is uniform, the coarse structure is broken to a certain extent, the internal structure is improved, and the plasticity is increased.

[0069] It should be noted that the terms "first," "second," etc., used in this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," "longitudinal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings.

[0070] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for cold drawing titanium alloy wire for eyeglass frames, characterized in that, include: Forging and blanking: TB13 ingots are selected, and after the risers are removed, forging and blanking are carried out. The forging and blanking method is two-fire blanking. Rolling: Take the titanium billet obtained after forging, grind, heat and roll it in two stages. The first rolling temperature is 850~920℃, held for 2 hours, rolling speed is 2.2m / s, final rolled size is Φ60mm, rolling passes are 13, and rolling deformation is 75%. The second rolling temperature is 830~900℃, held for 2 hours, rolling speed is 2.5m / s, rolling passes are 8, final rolled size is Φ16mm, and rolling deformation is 92%. After rolling, wire rod is obtained. Rounding and peeling: The material is rounded by hot drawing at 780℃ to remove ear defects on the surface. The size of the rounded wire rod is Φ15.5mm. The rounded wire rod is then peeled. The size of the peeled intermediate product is Φ14.5mm. Annealing heat treatment: The wire rods that have been rounded and peeled are subjected to annealing heat treatment in an online protective atmosphere heat treatment furnace. The heat treatment temperature is 750℃~800℃, the wire travel speed is 5~8m / min, the cooling method is spray water cooling, and the protective gas is 99.999% high-purity argon. Roller drawing: Take the wire rod after annealing heat treatment, apply water-soluble lubricant to the surface, and start drawing. The deformation of a single drawing pass is 20-25%, the drawing speed is 1.6~2.5m / s, and after 4-5 drawing passes, perform annealing heat treatment. Repeat the alternating cycle of roller drawing and annealing heat treatment multiple times to obtain titanium alloy wire with a size of Φ1.8-2.0mm. The titanium alloy wire is subjected to ultrasonic cleaning, heat treatment and cooling to obtain the finished product. The heat treatment of the finished product is carried out in an online protective atmosphere heat treatment furnace at a temperature of 730℃~780℃, with a wire travel speed of 4~6m / min. The cooling method is spray water cooling, and the protective gas is 99.999% high-purity argon.

2. The method for cold drawing titanium alloy wire for eyeglass frames according to claim 1, characterized in that, The second firing process includes: First forging: initial forging temperature 1050~1150℃, holding temperature for 3 hours, final forging temperature >700℃, upsetting and drawing deformation amount 65~70%; Second forging: initial forging temperature 900~1000℃, holding temperature for 3 hours, final forging temperature >600℃, upsetting and drawing deformation amount 60~65%.

3. The method for cold drawing titanium alloy wire for eyeglass frames according to claim 1, characterized in that, The peeling process specifically involves using a centerless grinding lathe to remove oxide scale and surface defects from the material surface.

4. The method for cold drawing titanium alloy wire for eyeglass frames according to claim 1, characterized in that, The ultrasonic cleaning process involves heating at 50-60°C, cleaning for 2-3 hours, using an ultrasonic frequency of 3-5 kHz, and employing a water-based cleaning agent as the cleaning medium.

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