Preparation method of titanium alloy wire

Abstract

The invention discloses a preparation method of a titanium alloy wire, which is characterized by comprising the following steps: S1, putting a titanium alloy wire blank into a box-type furnace, heating to 700-730 DEG C, keeping the temperature for 1 hour, taking out, carrying out air cooling for 8-15 minutes, and naturally cooling to normal temperature, so that a protective film is generated on the surface of the titanium alloy wire blank; s2, the titanium alloy wire blank coated with the protective film is placed on a material frame, a horizontal wire drawing machine is adopted for wire drawing, and liquid paraffin is added into the wire drawing machine to serve as wire drawing oil; s3, multi-pass wire drawing is adopted, the diameter reduction amount of each time of wire drawing is 0.1 mm, and the wire drawing speed is 10 + / -0.1 m / min; s4, a 4-meter annealing furnace is adopted for annealing without gas protection, the furnace temperature is 650 + / -20 DEG C, the annealing time is 2 minutes, and the speed of an annealing wire is 2 m / min; s5, surface black oxide skin is removed through multi-leaf wheel polishing, and surface polishing treatment is conducted through an abrasive belt polishing machine; and S6, cleaning is conducted, and black floating powder left on the polished surface is removed.

Description

Technical Field

[0001] The invention relates to the technical field of titanium alloy preparation, and in particular to a method for preparing a titanium alloy wire. Background Art

[0002] Titanium and titanium alloys are an important structural metal that was developed in the middle of the 20th century. They have the characteristics of low density, high specific strength, high temperature resistance, low temperature resistance, acid and alkali corrosion resistance, non-magnetic, small linear expansion coefficient, good damping and good biocompatibility. They are widely used in aviation, aerospace, medicine, sports, electricity, petrochemicals, metallurgy and other fields, and are called "the third metal" and "all-round metal". With the rapid development of science and technology and economy, the demand for titanium and titanium alloy bars and wires is also growing.

[0003] The existing preparation method of titanium alloy wire usually adopts hot drawing. During drawing, a layer of graphite emulsion is first coated on the surface of the wire blank and then heated to a certain degree for drawing. This method has high production cost, poor dimensional accuracy of the drawn wire, and the use of graphite emulsion for lubrication not only makes the working environment harsh, but also makes it difficult to reveal the surface defects of the drawn wire, thereby affecting the quality of the finished wire and bringing hidden dangers to subsequent processes. Summary of the invention

[0004] The purpose of the present invention is to solve the above technical problems and to provide a method for preparing titanium alloy wire. The titanium alloy wire blank is first subjected to box-type furnace oxidation treatment so that a layer of protective film is wrapped around the surface of the titanium alloy wire blank, and then the wire is drawn on a horizontal wire drawing machine. After adopting this process, the line speed during wire drawing can reach 10 meters / minute, which greatly improves the production efficiency and has a high yield rate.

[0005] In order to achieve the above object, the present invention adopts the following technical solution: A method for preparing a titanium alloy wire comprises the following steps:

[0006] S1: putting the titanium alloy wire billet into a box furnace for heating, then taking it out after keeping it warm, and naturally cooling it to room temperature by air cooling, so that a protective film is formed on the surface of the titanium alloy wire billet;

[0007] S2: placing the titanium alloy wire blank covered with a protective film on a material rack, using a horizontal wire drawing machine for wire drawing, and adding liquid paraffin as wire drawing oil in the wire drawing machine;

[0008] S3: multi-pass drawing, with the diameter of the wire reduced by 0.1 mm each time and the speed of the wire drawing being 10 ± 0.1 m / min;

[0009] S4: annealing in a 4-meter annealing furnace without gas protection, the furnace temperature is 650±20℃, the annealing time is 2 minutes, and the annealing line speed is 2 meters / minute;

[0010] S5: Use flap wheel polishing to remove the black oxide skin on the surface, and use a belt polishing machine to polish the surface;

[0011] S6: Clean and remove the black powder remaining on the surface after polishing.

[0012] In order to achieve the formation of a protective film of a certain thickness on the surface of the titanium alloy wire billet, a further preferred technical solution is that in the step S1, heating is performed to 700°C-730°C, keeping the temperature for 1 hour, then taking it out and air cooling it for 8-15 minutes.

[0013] In order to control the protective film on the surface of the titanium alloy wire billet to meet the requirements of subsequent processing, a further preferred technical solution is that in the step S1, the thickness of the protective film is 0.01-0.015 mm.

[0014] In order to prevent the mold from being damaged due to excessive speed during wire drawing, a further preferred technical solution is that in the S3 step, a titanium alloy wire billet with a diameter of 1.4 mm is subjected to 5 wire drawing passes, and the diameter is reduced by 0.1 mm each time. The diameter of the titanium alloy wire billet after wire drawing changes to 1.4-1.3-1.2-1.1-1.0-0.9 mm.

[0015] In order to effectively remove the protective film and control the surface quality of the titanium alloy wire, a further preferred technical solution is that in the step S5, the thickness of the black oxide scale removed by the flap wheel polishing is 0.01-0.015 mm.

[0016] In order to effectively remove the protective film, a further preferred technical solution is that in the step S5, the flap wheel is formed by combining at least two flap wheels with mesh sizes of 200-400.

[0017] In order to improve the surface quality of the titanium alloy wire, a further preferred technical solution is that in the step S5, the mesh number of the abrasive belt polisher is 2000 meshes.

[0018] Compared with the prior art, the beneficial effects of the present invention are: 1. Compared with the existing titanium alloy wire hot drawing method, the present invention saves energy, optimizes the on-site working environment, and reduces production costs;

[0019] 2. Before annealing the titanium alloy wire billet, the present invention firstly performs oxidation treatment in a box furnace to wrap a protective film on the surface of the titanium alloy wire billet, and then puts the wire billet on a horizontal wire drawing machine for wire drawing. After adopting this process, the line speed during cold drawing can reach 10 meters / minute, which greatly improves the production efficiency and has a high yield rate;

[0020] 3. Use 400-600 mesh flap wheels to polish and remove 0.01-0.015mm of black oxide on the surface, and then use 2000 mesh belt polisher to polish the surface, so that the dimensional accuracy and surface quality are effectively guaranteed.

[0021] 4. The surface is oxidized to form a black dense oxide film on the surface of the titanium alloy. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0023] Embodiment 1

[0024] A method for preparing a titanium alloy wire comprises the following steps:

[0025] S1: putting the titanium alloy wire billet into a box furnace for heating, then taking it out after keeping it warm, and naturally cooling it to room temperature by air cooling, so that a protective film is formed on the surface of the titanium alloy wire billet;

[0026] S2: placing the titanium alloy wire blank covered with a protective film on a material rack, using a horizontal wire drawing machine for wire drawing, and adding liquid paraffin as wire drawing oil in the wire drawing machine;

[0027] S3: multi-pass drawing, with the diameter of the wire reduced by 0.1 mm each time and the drawing speed of 10 m / min;

[0028] S4: annealing in a 4-meter annealing furnace without gas protection, the furnace temperature is 650°C, the annealing time is 2 minutes, and the annealing line speed is 2 meters / minute;

[0029] S5: Use flap wheel polishing to remove the black oxide skin on the surface, and use a belt polishing machine to polish the surface;

[0030] S6: Clean and remove the black powder remaining on the surface after polishing.

[0031] Embodiment 2

[0032] S1: a titanium alloy wire billet with a diameter of 1.4 mm is placed in a box furnace and heated to 700°C, then taken out after being kept at this temperature for 1 hour, and naturally cooled to room temperature in air for 8 minutes, so that a protective film with a thickness of 0.01 mm is formed on the surface of the titanium alloy wire billet;

[0033] S2: placing the titanium alloy wire blank covered with a protective film on a material rack, using a horizontal wire drawing machine for wire drawing, and adding liquid paraffin as wire drawing oil in the wire drawing machine;

[0034] S3: A titanium alloy wire with a diameter of 1.4 mm is drawn through 5 passes, with a diameter reduction of 0.1 mm each time and a drawing speed of 10 m / min;

[0035] The diameter of the titanium alloy wire billet after the first drawing pass changes to 1.3 mm;

[0036] The diameter of the titanium alloy wire billet after the second drawing pass changes to 1.2 mm;

[0037] The diameter of the titanium alloy wire billet after the third drawing pass changes to 1.1 mm;

[0038] The diameter of the titanium alloy wire billet after the fourth drawing pass changes to 1.0 mm;

[0039] The diameter of the titanium alloy wire billet after the fifth drawing pass changes to 0.9 mm;

[0040] S4: annealing in a 4-meter annealing furnace without gas protection, the furnace temperature is 650°C, the annealing time is 2 minutes, and the annealing line speed is 2 meters / minute;

[0041] S5: Use two flap wheels with mesh numbers of 200-400 to polish and remove the black oxide scale on the surface. The thickness of the black oxide scale removed by the flap wheel polishing is 0.01 mm. The surface is polished by a belt polisher with a mesh number of 2000.

[0042] S6: Clean and remove the black powder remaining on the surface after polishing.

[0043] Embodiment 3

[0044] A method for preparing a titanium alloy wire comprises the following steps:

[0045] S1: Put a titanium alloy wire billet with a diameter of 1.4 mm into a box furnace and heat it to 730°C, then take it out after keeping it warm for 1 hour, and naturally cool it to room temperature in air for 15 minutes, so that a protective film with a thickness of 0.015 mm is formed on the surface of the titanium alloy wire billet;

[0046] S2: placing the titanium alloy wire blank covered with a protective film on a material rack, using a horizontal wire drawing machine for wire drawing, and adding liquid paraffin as wire drawing oil in the wire drawing machine;

[0047] S3: A titanium alloy wire with a diameter of 1.4 mm is drawn through 5 passes, with a diameter reduction of 0.1 mm each time and a drawing speed of 10 m / min;

[0048] The diameter of the titanium alloy wire billet after the first drawing pass changes to 1.3 mm;

[0049] The diameter of the titanium alloy wire billet after the second drawing pass changes to 1.2 mm;

[0050] The diameter of the titanium alloy wire billet after the third drawing pass changes to 1.1 mm;

[0051] The diameter of the titanium alloy wire billet after the fourth drawing pass changes to 1.0 mm;

[0052] The diameter of the titanium alloy wire billet after the fifth drawing pass changes to 0.9 mm;

[0053] Since the titanium wire process is quite different from the stainless steel wire process, the compression rate of the titanium wire drawing process should be small, and the total compression rate should not be too large, otherwise it will easily lead to mold rupture, local rupture of the coating, and even wire shrinkage.

[0054] S4: annealing in a 4-meter annealing furnace without gas protection, the furnace temperature is 650°C, the annealing time is 2 minutes, and the annealing line speed is 2 meters / minute; specifically, annealing in a 4-meter annealing furnace without gas protection can reduce product production costs, the furnace temperature is 650°C, fine-tuning is performed according to the actual hardness test results, the annealing time is 2 minutes, and attention should be paid to the shrinkage during annealing, the wire tension should be controlled, and the actual tension is adjusted with brake pads. When taking up the wire, a horizontal single-head take-up is used, and the inverter controls the speed to 2 meters / minute;

[0055] S5: Use two flap wheels with mesh numbers of 200-400 to polish and remove the black oxide skin on the surface. The thickness of the black oxide skin removed by the flap wheel polishing is 0.015 mm. The surface is polished by a belt polisher with a mesh number of 2000.

[0056] S6: Clean and remove the black powder remaining on the surface after polishing.

[0057] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A method for preparing a titanium alloy wire, characterized in that: The steps include: S1: Put the titanium alloy wire billet into a box furnace for heating, then take it out after keeping it warm, and naturally cool it to room temperature by air cooling, so that a protective film is formed on the surface of the titanium alloy wire billet; S2: placing the titanium alloy wire blank covered with a protective film on a material rack, using a horizontal wire drawing machine for wire drawing, and adding liquid paraffin as wire drawing oil in the wire drawing machine; S3: Multi-pass drawing is adopted, the diameter of the wire is reduced by 0.1 mm each time, and the drawing speed is 10±0.1 m / min; S4: annealing in a 4-meter annealing furnace without gas protection, the furnace temperature is 650±20℃, the annealing time is 2 minutes, and the annealing line speed is 2 meters / minute; S5: Use flap wheel polishing to remove the black oxide skin on the surface, and use a belt polisher to polish the surface; S6: Cleaning is performed to remove the black powder remaining on the surface after polishing.

2. The method for preparing a titanium alloy wire according to claim 1, characterized in that: In the step S1, the mixture is heated to 700° C.-730° C., kept at this temperature for 1 hour, taken out, and air-cooled for 8-15 minutes.

3. The method for preparing a titanium alloy wire according to claim 1, characterized in that: In the step S1, the thickness of the protective film is 0.01-0.015 mm.

4. The method for preparing a titanium alloy wire according to claim 2, characterized in that: In the step S3, a titanium alloy wire billet with a diameter of 1.4 mm is subjected to 5 wire drawing passes, and the diameter is reduced by 0.1 mm each time. The diameter of the titanium alloy wire billet after wire drawing varies from 1.4-1.3-1.2-1.1-1.0-0.9 mm.

5. The method for preparing a titanium alloy wire according to claim 3, characterized in that: In the step S5, the thickness of the black oxide scale removed by the flap wheel polishing is 0.01-0.015 mm.

6. The method for preparing a titanium alloy wire according to claim 4, characterized in that: In the step S5, the flap wheel is formed by combining at least two flap wheels with mesh sizes of 200-400.

7. The method for preparing a titanium alloy wire according to claim 4, characterized in that: In the step S5, the mesh number of the belt polisher is 2000 meshes.