A method for efficiently and environmentally preparing large single-weight titanium alloy wire

Abstract

The application discloses a method for efficiently and environmentally preparing large single-weight titanium alloy wire, and comprises the following steps: step one, open forging, to obtain large single-weight square billet; step two, large rolling mill rolling large single-weight round billet, to obtain large single-weight round billet; step three, continuous rolling to prepare large single-weight round disc, to obtain large single-weight round disc; step four, roll die wire drawing and protective gas annealing, to obtain large single-weight titanium alloy wire with a diameter of 2.0mm-3.0mm. The application eliminates defects such as air hole and shrinkage in the TC4 titanium alloy ingot casting process through upsetting and drawing forging, improves the uniformity of the structure, reduces the diameter for subsequent construction, reduces the radial size of the large single-weight square billet through rolling, meets the feeding size of the subsequent continuous rolling equipment, reduces the diameter of the large single-weight round billet as much as possible under the condition of ensuring that the large single-weight round billet is not overheated through large deformation continuous rolling, and further reduces the diameter through roll die drawing to obtain large single-weight titanium alloy wire products.

Description

Technical Field

[0001] This invention belongs to the field of titanium alloy wire preparation and processing technology, specifically relating to an efficient and environmentally friendly method for preparing large single-weight titanium alloy wires. Background Technology

[0002] Titanium alloy wires are widely used in aerospace, chemical, biomedical, automotive and 3C fields due to their high specific strength, good corrosion resistance, good biocompatibility and non-magnetic properties.

[0003] Traditional titanium alloy wire processing mainly includes processes such as small billet preparation, small billet rolling, and fixed-die drawing. The rolling process primarily uses a 250mm small rolling mill to roll the billet to the pre-drawing dimensions in a single pass. This process suffers from problems such as low billet weight, numerous defects at the beginning and end, slow rolling speed, and low production efficiency. Furthermore, the fixed-die drawing process suffers from slow drawing speed, small reduction in diameter per pass, long processing steps, and low production efficiency. Moreover, titanium alloy wire absorbs harmful elements such as nitrogen, hydrogen, and oxygen from the air when heated, severely affecting wire quality. Finally, traditional processes require coating the wire surface with graphite emulsion before drawing, resulting in high dust levels and a poor working environment during the drawing process.

[0004] In view of the shortcomings of traditional preparation processes, including small single weight, low efficiency, low material yield, and large environmental pollution, there is an urgent need for a high-efficiency and environmentally friendly method for processing and preparing large single-weight titanium alloy wires. Summary of the Invention

[0005] The technical problem to be solved by this invention is to provide an efficient and environmentally friendly method for preparing large single-weight titanium alloy wire, addressing the shortcomings of the prior art. This method eliminates defects such as porosity and shrinkage during the casting process of TC4 titanium alloy ingots through forging and upsetting, improving the uniformity of the microstructure. Simultaneously, the diameter reduction facilitates subsequent construction. Rolling reduces the radial dimension of the large single-weight square billet to meet the feeding dimensions of subsequent continuous rolling equipment. Through continuous rolling with large deformation, the diameter of the large single-weight round billet is reduced as much as possible while ensuring that the billet does not overheat. Further diameter reduction is achieved through roll drawing to obtain the large single-weight titanium alloy wire product, thus realizing the preparation of large single-weight titanium alloy wire.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a method for efficiently and environmentally friendly preparing large single-weight titanium alloy wires, characterized in that the method includes the following steps:

[0007] Step 1, Square Forging: After peeling off the TC4 titanium alloy ingot with a diameter of 640mm to 820mm and removing the riser and bottom, the ingot is placed in a heating furnace for heating. Then it is forged and upturned to a side length of 300mm to 450mm. After that, it is reheated in the furnace and forged to square to a side length of 180mm to 200mm. The surface is then ground with a grinding wheel and finally sawn to obtain a large single-weight square billet.

[0008] Step 2: Rolling large single-weight round billets in a large rolling mill: The large single-weight square billets obtained in Step 1 are placed in a heating furnace for heating, then rolled, and then the surface is polished with a peeling machine to obtain large single-weight round billets with a diameter of 80mm to 100mm.

[0009] Step 3: Continuous rolling to prepare large single-weight disc round parts: The large single-weight round billet obtained in step 2 is placed in a heating furnace for heating, then continuously rolled, and then the surface is treated with a peeling lathe to obtain large single-weight disc round parts with a diameter of 7mm to 10mm.

[0010] Step 4: Roller drawing: The large single-weight disc obtained in Step 3 is placed in a heating furnace for heating, then drawn by a roller, then polished, and then annealed under a protective gas to obtain a large single-weight titanium alloy wire with a diameter of 2.0mm to 3.0mm.

[0011] In this invention, the TC4 titanium alloy ingot is cylindrical; the TC4 titanium alloy ingot after forging and upsetting is a cuboid structure with a square cross-section, where the side length is 300mm to 450mm (referring to the side length of the cross-section); the TC4 titanium alloy ingot after forging and squaring is a cuboid structure with a square cross-section, where the side length is 180mm to 200mm (referring to the side length of the cross-section).

[0012] The above-mentioned efficient and environmentally friendly method for preparing large single-weight titanium alloy wire is characterized in that, in step one, the heating temperature in the furnace is 1100℃~1150℃ for 6h~10h, and the reheating temperature in the furnace is 1100℃~1150℃ for 2h~4h. This invention, by controlling the parameters of the furnace heating and reheating, ensures that the TC4 titanium alloy deforms above its phase transformation point, and that the TC4 titanium alloy does not crack under large deformation, thus guaranteeing the preparation of large single-weight titanium alloy wire.

[0013] The above-described method for efficiently and environmentally friendly preparing heavy single-unit titanium alloy wire is characterized in that the single-unit weight of the heavy single-unit square billet in step one is greater than 180 kg. This invention is applicable to the preparation of heavy single-unit titanium alloy wire.

[0014] The above-mentioned efficient and environmentally friendly method for preparing large single-weight titanium alloy wire is characterized in that, in step two, the heating temperature is 800℃~850℃, the time is 2h~4h, the rolling speed is 2m / s~5m / s, and the number of rolling passes is 8 to 12. This invention controls the heating temperature below the phase transformation point by controlling the heating and rolling parameters, thus avoiding overheating while ensuring roll deformation and guaranteeing the preparation of large single-weight titanium alloy wire.

[0015] The above-mentioned efficient and environmentally friendly method for preparing large single-weight titanium alloy wire is characterized in that the heating temperature in step three is 800℃~830℃, the time is 2h~3h, the continuous rolling speed is 5m / s~10m / s, and the number of continuous rolling cycles is 6~8. This invention controls the heating temperature below the phase transformation point by controlling the heating and continuous rolling parameters, avoiding overheating while allowing for continuous rolling deformation, and minimizing the diameter of the large single-weight round billet without overheating, thus ensuring the preparation of large single-weight titanium alloy wire.

[0016] The above-mentioned efficient and environmentally friendly method for preparing large single-weight titanium alloy wire is characterized in that the heating temperature in step four is 800℃~830℃, the roller drawing speed is 10m / min~20m / min, the drawing is performed in 6 to 9 passes, and the deformation amount per pass is 5%~20%. This invention controls the temperature below the phase transformation point by controlling the roller drawing parameters, avoiding overheating while still allowing for roller drawing deformation, and further reducing the wire diameter, thus ensuring the preparation of large single-weight titanium alloy wire.

[0017] The above-mentioned method for efficiently and environmentally friendly preparing large single-weight titanium alloy wire is characterized in that no lubricant is applied during the roller drawing process in step four. This invention avoids the problems of high dust levels and harsh working environments caused by conventional lubricants by not applying lubricant during roller drawing, thus embodying the concept of environmental protection.

[0018] The above-mentioned efficient and environmentally friendly method for preparing large single-weight titanium alloy wire is characterized in that the protective gas in step four is argon, and the annealing temperature is 600℃~700℃, and the time is 1h~3h. This invention improves the quality of large single-weight titanium alloy wire through argon-protected annealing.

[0019] Compared with the prior art, the present invention has the following advantages:

[0020] 1. This invention eliminates defects such as porosity and shrinkage during the casting process of TC4 titanium alloy ingots through forging and upsetting, thereby improving the uniformity of the microstructure. At the same time, the diameter reduction facilitates subsequent construction. The radial dimension of the large single-weight square billet is reduced by rolling to meet the feeding size of the subsequent continuous rolling equipment. Through continuous rolling with large deformation, the diameter of the large single-weight round billet is reduced as much as possible while ensuring that the large single-weight round billet does not overheat. The diameter is further reduced by drawing with a roll die to obtain the large single-weight titanium alloy wire product.

[0021] 2. This invention ensures that TC4 titanium alloy deforms above the phase transformation point by controlling the rolling and continuous rolling parameters, and that TC4 titanium alloy does not crack under large deformation. Under the premise of being able to roll deformation, it avoids the formation of overheated structure. Without overheating the large single-weight round billet, it reduces the diameter of the large single-weight round billet as much as possible. By controlling the parameters of the roll die drawing and further reducing the diameter, the preparation of large single-weight titanium alloy wire is guaranteed.

[0022] 3. This invention does not apply lubricant during roller die drawing, thus avoiding the problems of high dust levels and harsh working environment caused by conventional lubricants, reflecting the concept of environmental protection.

[0023] 4. The large single-weight titanium alloy wire prepared by this invention is in fixed length or coiled form, with a diameter of 2.0mm to 3.0mm and a length of over 5000m. The entire preparation process has large batch volume, short production cycle, high production efficiency, high material yield, and qualified composition, which has obvious technical advantages. It overcomes the problems of traditional processing methods, such as small single weight (generally 20kg), low production efficiency, environmental pollution in some processes, and low material utilization.

[0024] The technical solution of the present invention will be further described in detail below through embodiments. Detailed Implementation

[0025] Example 1

[0026] This embodiment includes the following steps:

[0027] Step 1, Square Forging: After peeling off the 640mm diameter TC4 titanium alloy ingot and removing the riser and bottom, the ingot is placed in a heating furnace and heated to 1150℃ and held for 8 hours. Then it is forged and upturned to a side length of 450mm. After that, it is returned to the furnace and heated to 1100℃ and held for 3 hours. The ingot is then forged and squared to a side length of 200mm. The surface is then ground with a grinding wheel to remove oxide scale and defects. Finally, it is sawn to obtain a large single square billet with a weight of 200kg.

[0028] Step 2: Rolling large single-weight round billets in a large rolling mill: The large single-weight square billets obtained in Step 1 are placed in a heating furnace and heated to 850°C and held for 4 hours. Then, they are rolled 10 times at a rolling speed of 5 m / s. Finally, they are polished with a peeling machine to remove oxide scale and defects, resulting in a large single-weight round billet with a diameter of 100 mm.

[0029] Step 3: Continuous rolling preparation of large single-weight disc round parts: The large single-weight disc round billet obtained in step 2 is placed in a heating furnace and heated to 830℃ and held for 3 hours. Then, it is continuously rolled 8 times at a rolling speed of 5m / s. The surface is then treated with a peeling lathe to remove the surface oxide layer and defects, resulting in a large single-weight disc round part with a single weight of 180kg and a diameter of 10mm.

[0030] Step 4: Roller drawing: The large single-weight disc obtained in Step 3 is placed in a heating furnace and heated to 800℃. Then, it is drawn 6 times with a drawing speed of 10m / min to 20m / min and a deformation of 10% to 20% per pass. After that, the surface is polished and then annealed at 600℃ for 1 hour under argon protection to obtain a large single-weight titanium alloy wire with a weight of 159kg, a length of 5000m, and a diameter of 3.0mm.

[0031] Upon testing, the hydrogen content of the large single-weight titanium alloy wire prepared in this embodiment is 0.005%, which meets the requirement (the standard requires a hydrogen content of less than 0.008%). The diameters of the large single-weight titanium alloy wire at three locations are 3.003 mm, 3.005 mm, and 3.004 mm, which also meet the standard requirements.

[0032] Example 2

[0033] This embodiment includes the following steps:

[0034] Step 1, Square Forging: After peeling off the 720mm diameter TC4 titanium alloy ingot and removing the riser and bottom, the ingot is placed in a heating furnace and heated to 1150℃ and held for 9 hours. Then it is forged and upturned to a side length of 450mm. After that, it is returned to the furnace and heated to 1100℃ and held for 3 hours. The ingot is then forged and squared to a side length of 200mm. The surface is then ground with a grinding wheel to remove oxide scale and defects. Finally, it is sawn to obtain a large single square billet with a weight of 200kg.

[0035] Step 2: Rolling large single-weight round billets in a large rolling mill: The large single-weight square billets obtained in Step 1 are placed in a heating furnace and heated to 850°C and held for 4 hours. Then, they are rolled 10 times at a rolling speed of 5 m / s. Finally, they are polished with a peeling machine to remove oxide scale and defects, resulting in a large single-weight round billet with a diameter of 100 mm.

[0036] Step 3: Continuous rolling preparation of large single-weight disc round parts: The large single-weight disc round billet obtained in step 2 is placed in a heating furnace and heated to 830℃ and held for 3 hours. Then, it is continuously rolled 6 times at a rolling speed of 5m / s. The surface is then treated with a peeling lathe to remove the surface oxide layer and defects, resulting in a large single-weight disc round part with a weight of 180kg and a diameter of 10mm.

[0037] Step 4, Roller Die Drawing: The large single-weight disc obtained in Step 3 is placed in a heating furnace and heated to 800℃. Then, it is drawn 7 times with a drawing speed of 10m / min to 20m / min and a deformation of 10% to 20% per pass. After that, the surface is polished, and then annealed under argon protection at 650℃ for 2 hours under argon protection to obtain a large single-weight titanium alloy wire with a weight of 128kg, a length of 6300m, and a diameter of 2.4mm.

[0038] Upon testing, the hydrogen content of the large single-weight titanium alloy wire prepared in this embodiment is 0.005%, which meets the requirement (the standard requires a hydrogen content of less than 0.008%). The diameters of the large single-weight titanium alloy wire at three locations are 2.43 mm, 2.41 mm, and 2.44 mm, which also meet the standard requirements.

[0039] Example 3

[0040] This embodiment includes the following steps:

[0041] Step 1, Square Forging: After peeling off the 640mm diameter TC4 titanium alloy ingot and removing the riser and bottom, place it in a heating furnace and heat it to 1150℃ for 9 hours. Then, forge and uplift it to a side length of 450mm. After that, return it to the furnace and heat it to 1100℃ for 3 hours. Then, forge and square it to a side length of 200mm. Then, use a grinding wheel to grind the surface to remove oxide scale and defects. Finally, saw it to obtain a large single square billet with a weight of 200kg.

[0042] Step 2: Rolling large single-weight round billets in a large rolling mill: The large single-weight square billets obtained in Step 1 are placed in a heating furnace and heated to 850°C and held for 4 hours. Then, they are rolled 10 times at a rolling speed of 5 m / s. Finally, they are polished with a peeling machine to remove oxide scale and defects, resulting in a large single-weight round billet with a diameter of 100 mm.

[0043] Step 3: Continuous rolling preparation of large single-weight disc round parts: The large single-weight disc round billet obtained in step 2 is placed in a heating furnace and heated to 830℃ and held for 3 hours. Then, it is continuously rolled 7 times at a rolling speed of 5m / s. The surface is then treated with a peeling lathe to remove the surface oxide layer and defects, resulting in a large single-weight disc round part with a single weight of 180kg and a diameter of 10mm.

[0044] Step 4, Roller Die Drawing: The large single-weight disc obtained in Step 3 is placed in a heating furnace and heated to 810℃. Then, it is drawn 8 times with a drawing speed of 10m / min to 20m / min and a deformation of 10% to 20% per pass. After that, the surface is polished and then annealed at 700℃ for 3 hours under argon protection to obtain a large single-weight titanium alloy wire with a weight of 120kg, a length of 8500m, and a diameter of 2.0mm.

[0045] Upon testing, the hydrogen content of the large single-weight titanium alloy wire prepared in this embodiment was 0.005%, which meets the requirement (the standard requires a hydrogen content of less than 0.008%). The diameters of the large single-weight titanium alloy wire at three locations prepared in this embodiment are 2.04 mm, 2.03 mm, and 2.01 mm, which also meet the standard requirements.

[0046] Example 4

[0047] This embodiment includes the following steps:

[0048] Step 1, Square Forging: After peeling off the 820mm diameter TC4 titanium alloy ingot and removing the riser and bottom, place it in a heating furnace and heat it to 1100℃ and hold it for 10 hours. Then, forge and uplift it to a side length of 400mm. After that, return it to the furnace and heat it to 1150℃ and hold it for 2 hours. Then, forge and square it to a side length of 190mm. Then, use a grinding wheel to grind the surface to remove oxide scale and defects. Finally, saw it to obtain a large single square billet with a single weight of 200kg.

[0049] Step 2: Rolling large single-weight round billets in a large rolling mill: The large single-weight square billets obtained in Step 1 are placed in a heating furnace and heated to 830℃ and held for 3 hours. Then, they are rolled 8 times at a rolling speed of 2m / s. Finally, they are polished with a peeling machine to remove oxide scale and defects, and a large single-weight round billet with a diameter of 90mm is obtained.

[0050] Step 3: Continuous rolling preparation of large single-weight disc round parts: The large single-weight disc round billet obtained in Step 2 is placed in a heating furnace and heated to 820℃ and held for 2.5h. Then, it is continuously rolled for 8 times at a rolling speed of 10m / s. The surface is then treated with a peeling lathe to remove the surface oxide layer and defects, resulting in a large single-weight disc round part with a weight of 180kg and a diameter of 8mm.

[0051] Step 4, Roller Die Drawing: The large single-weight disc obtained in Step 3 is placed in a heating furnace and heated to 820℃. Then, it is drawn 8 times with a drawing speed of 10m / min to 20m / min and a deformation of 10% to 20% per pass. After that, the surface is polished and then annealed at 650℃ for 3 hours under argon protection to obtain a large single-weight titanium alloy wire with a weight of 143kg, a length of 6000m, and a diameter of 2.6mm.

[0052] Upon testing, the hydrogen content of the large single-weight titanium alloy wire prepared in this embodiment was 0.005%, which meets the requirement (the standard requires a hydrogen content of less than 0.008%). The diameters of the large single-weight titanium alloy wire at three locations prepared in this embodiment are 2.63 mm, 2.63 mm, and 2.61 mm, which also meet the standard requirements.

[0053] Example 5

[0054] This embodiment includes the following steps:

[0055] Step 1, Square Forging: After peeling off the 760mm diameter TC4 titanium alloy ingot and removing the riser and bottom, it is placed in a heating furnace and heated to 1120℃ and held for 9 hours. Then it is forged and upturned to a side length of 300mm. After that, it is returned to the furnace and heated to 1120℃ and held for 4 hours. It is then forged and squared to a side length of 180mm. The surface is then ground with a grinding wheel to remove oxide scale and defects. Finally, it is sawn to obtain a large single square billet with a weight of 200kg.

[0056] Step 2: Rolling large single-weight round billets in a large rolling mill: The large single-weight square billets obtained in Step 1 are placed in a heating furnace and heated to 800℃ and held for 2 hours. Then, they are rolled 12 times at a rolling speed of 3m / s. Finally, they are polished with a peeling machine to remove oxide scale and defects, and a large single-weight round billet with a diameter of 80mm is obtained.

[0057] Step 3: Continuous rolling preparation of large single-weight disc round parts: The large single-weight disc round billet obtained in step 2 is placed in a heating furnace and heated to 800℃ and held for 2 hours. Then, it is continuously rolled 8 times at a rolling speed of 7m / s. The surface is then treated with a peeling lathe to remove the surface oxide layer and defects, resulting in a large single-weight disc round part with a single weight of 180kg and a diameter of 7mm.

[0058] Step 4: Roller drawing: The large single-weight disc obtained in Step 3 is placed in a heating furnace and heated to 830℃. Then, it is drawn 9 times with a roller drawing speed of 10m / min to 20m / min and a deformation of 5% to 10% per pass. After that, the surface is polished and then annealed at 700℃ for 2 hours under argon protection to obtain a large single-weight titanium alloy wire with a weight of 134kg, a length of 6100m, and a diameter of 2.5mm.

[0059] Upon testing, the hydrogen content of the large single-weight titanium alloy wire prepared in this embodiment was 0.005%, which meets the requirement (the standard requires a hydrogen content of less than 0.008%). The diameters of the large single-weight titanium alloy wire at three locations prepared in this embodiment are 2.51 mm, 2.52 mm, and 2.52 mm, respectively, which also meet the standard requirements.

[0060] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention in any way. Any simple modifications, alterations, and equivalent changes made to the above embodiments based on the technical essence of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A method for efficiently and environmentally friendly producing large monodiameter titanium alloy wires, characterized in that, The method comprises the following steps: Step one, open forging: the TC4 titanium alloy ingot with a diameter of 640mm-820mm is peeled and the riser and ingot bottom are cut off, then put into a heating furnace for heating, then forged upsetting and drawing to a side length of 300mm-450mm, then reheated and forged to a side length of 180mm-200mm, then the surface is polished by a grinding machine, finally sawn and cut down, to obtain a large single weight square blank; the heating temperature of the heating furnace is 1100-1150℃, the time is 6-10h, the reheating temperature is 1100-1150℃, the time is 2-4h; the single weight of the large single weight square blank is greater than 180kg; Step two, large single weight round blank is rolled by a large rolling mill: the large single weight square blank obtained in step one is put into a heating furnace for heating, then rolled, then the surface is polished by a peeling machine, to obtain a large single weight round blank with a diameter of 80-100mm; Step three, large single weight disc round piece is prepared by continuous rolling: the large single weight round blank obtained in step two is put into a heating furnace for heating, then continuously rolled, then the surface is treated by a peeling lathe, to obtain a large single weight disc round piece with a diameter of 7-10mm; Step four, roll die wire drawing: the large single weight disc round piece obtained in step three is put into a heating furnace for heating, then roll die drawn, then polished, then annealed in a protective gas, to obtain a large single weight titanium alloy wire with a diameter of 2.0-3.0mm; no lubricant is applied in the roll die drawing.

2. The method for preparing large single-weight titanium alloy wire according to claim 1, characterized in that, In step two, the heating temperature is 800-850℃, the time is 2-4h, the rolling speed is 2-5m / s, and the rolling pass number is 8-12.

3. The method for preparing large single-weight titanium alloy wire according to claim 1, characterized in that, In step three, the heating temperature is 800-830℃, the time is 2-3h, the continuous rolling speed is 5-10m / s, and the continuous rolling number is 6-8.

4. The method for preparing large single-weight titanium alloy wire according to claim 1, characterized in that, In step four, the heating temperature is 800-830℃, the roll die drawing speed is 10-20m / min, the drawing pass number is 6-9, and the deformation amount of each pass is 5-20%.

5. The method for preparing large single-weight titanium alloy wire according to claim 1, characterized in that, In step four, the protective gas is argon, the annealing temperature is 600-700℃, and the time is 1-3h.