Titanium alloy wire drawing preparation method and titanium alloy wire

Abstract

The invention discloses a titanium alloy wire drawing preparation method. The titanium alloy wire drawing preparation method comprises the following steps that a titanium alloy cast ingot is sequentially subjected to first heating number forging to obtain a first plate blank; the first plate blank is subjected to second heating number forging, and a second plate blank is obtained; the second plate blank is subjected to third heating number forging, and a third plate blank is obtained; performing fourth heating number forging on the third plate blank to obtain a fourth plate blank; the fourth plate blank is subjected to fifth heating number forging, and a bar is obtained; and carrying out rolling, rotary swaging and drawing on the bar to obtain the wire with the final size. According to the scheme, the titanium alloy bar is obtained through five-heating-number forging forming, the radial texture of the bar is high, the extensibility is improved, the bar has the better diameter reduction resisting capacity when bent in the special environment, and wire rod rolling and subsequent wire drawing process production are better facilitated. And the whole wire preparation process is free of acid pickling and electrolysis, no hydrogen, oxygen and nitrogen are increased in the production process, and the component purity is high.

Description

Technical Field

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

[0002] The traditional wire drawing preparation process of TB13 titanium alloy wire is: fixed die hot drawing, heat treatment, pickling, and polishing. This preparation process is mostly delivered in the form of wire rod and machined surface.

[0003] However, 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 between 700°C and 800°C, which can easily cause the wire to absorb harmful elements such as nitrogen, hydrogen, and oxygen in the air under heating, thereby reducing the consistency of material performance; (3) there is a very large sliding friction between the fixed die and the wire during drawing, which can easily lead to an increase in the dimensional tolerance of the wire and scratches on the wire surface, forming a continuous quality defect; (4) after the wire is drawn, electrolytic polishing or pickling must be used to remove the graphite or phosphated lubricant on the wire surface. This method will cause high energy consumption and high pollution in the preparation of the wire. Summary of the invention

[0004] In view of this, in order to overcome at least one aspect of the above problems, an embodiment of the present invention provides a method for drawing and preparing a titanium alloy wire, comprising the following steps: The titanium alloy ingot is subjected to first fire forging in sequence to obtain a first slab; Performing a second heat forging on the first slab to obtain a second slab; Performing a third heat forging on the second slab to obtain a third slab; Performing a fourth heat forging on the third slab to obtain a fourth slab; Performing a fifth fire forging on the fourth slab to obtain a rod; The rod is rolled, rotary forged and drawn to obtain a wire of final size.

[0005] In some embodiments, the titanium alloy ingot is subjected to a first fire forging in sequence to obtain a first slab, further comprising: The titanium alloy ingot is subjected to ingot body peeling, riser sawing and the edges and corners of the sawed parts are polished for smooth transition.

[0006] In some embodiments, the titanium alloy ingot is subjected to a first fire forging in sequence to obtain a first slab, further comprising: Placing the titanium alloy ingot in a forging furnace, and keeping it at 800°C-850°C for 3-4 hours, then heating it to 1100°C-1200°C at a rate of 100°C-120°C / h, and keeping it at that temperature for 6-7 hours; After being taken out of the furnace, the slab is pressed radially into a slab of (380~400)mm×(800~900)mm×L, and then returned to the furnace and kept at 1100℃~1200℃ for 2~3h; After being taken out of the furnace, the slab is pressed again into a slab of (380~400)mm×(800~900)mm×L in the width direction, and then returned to the furnace and the temperature is lowered to 80℃~100℃ above the phase change point, and kept warm for 3~4h; After being taken out of the furnace, the steel is pressed again in the width direction into a slab of (380~400)mm×(800~900)mm×L, and then returned to the furnace for insulation for 3~4h; After being taken out of the furnace, the slab is pressed again in the width direction to be a slab of (380-400) mm× (800-900) mm×L, and the two ends are flattened, thrown out and air-cooled to obtain the first slab.

[0007] In some embodiments, performing a second heat forging on the first slab to obtain a second slab further comprises: The first slab is placed in a forging furnace, and kept at 750°C to 800°C for 3 to 4 hours, and then heated at a rate of 60°C to 80°C / h to 40 to 50°C below the phase transition point, and kept at this temperature for 5 to 6 hours; After being taken out of the furnace, the slab is pressed into a slab of (380~400)mm×(800~900)mm×L in the width direction, and then returned to the furnace and kept at 40~50℃ below the phase change point for 2~3h; After being taken out of the furnace, the steel is pressed again in the width direction to form a slab of (380~400)mm×(800~900)mm×L, and then returned to the furnace and kept at 40~50℃ below the phase change point for 2~3h; After being taken out of the furnace, the slab is pressed again in the width direction to be a slab of (380-400) mm×(800-900) mm×L, and the two ends are flattened, thrown out and air-cooled to obtain the second slab.

[0008] In some embodiments, performing a third heat forging on the second slab to obtain a third slab further comprises: The second slab is placed in a forging furnace, and kept at 800°C to 850°C for 3 to 4 hours, and then heated at a rate of 80°C to 100°C / h to 40 to 60°C above the phase transition point, and kept at this temperature for 5 to 6 hours; After being taken out of the furnace, the slab is pressed into a slab of (380~400)mm×(800~900)mm×L in the width direction, and then returned to the furnace and kept at 40~60℃ above the phase change point for 2~3h; After being taken out of the furnace, the steel is pressed again in the width direction to form a slab of (380~400)mm×(800~900)mm×L, and then returned to the furnace and kept at 40~60℃ above the phase change point for 2~3h; After being taken out of the furnace, the slab is pressed again in the width direction to form a slab of (380-400) mm×(800-900) mm×L, and the two ends are flattened, thrown out and air-cooled to obtain the third slab.

[0009] In some embodiments, performing a fourth heat forging on the third slab to obtain a fourth slab further comprises: The third slab is placed in a forging furnace, and kept at 750°C to 800°C for 3 to 4 hours, and then heated at a rate of 60°C to 80°C / h to 50 to 60°C below the phase transition point, and kept at this temperature for 5 to 6 hours; After being taken out of the furnace, the slab is pressed into a slab of (380~400)mm×(800~900)mm×L in the width direction, and then returned to the furnace and kept at 50~60℃ below the phase change point for 2~3h; After being taken out of the furnace, the steel is pressed again in the width direction to form a slab of (380~400)mm×(800~900)mm×L, and then returned to the furnace and kept at 50~60℃ below the phase change point for 2~3h; After being taken out of the furnace, the slab is pressed again in the width direction to be a slab of (380-400) mm×(800-900) mm×L, and the two ends are flattened, thrown out and air-cooled to obtain the fourth slab.

[0010] In some embodiments, performing a fifth fire forging on the fourth slab to obtain a rod further comprises: The fourth slab is placed in a forging furnace, and kept at 750°C to 800°C for 1 to 2 hours, and then heated at a rate of 60°C to 80°C / h to 40 to 50°C below the phase transition point, and kept at this temperature for 3 to 4 hours; After being taken out of the furnace, it is stretched and forged until a bar of Φ(200~230)mm×L is obtained.

[0011] In some embodiments, the rod is rolled, swaged, and drawn to obtain a wire of a final size, further comprising: The bar is rolled by using a second-heat rolling mill to obtain a wire rod of a first size; The wire rod of the first size is peeled and then subjected to multiple passes of rotary forging to obtain a wire rod of the second size; The wire material of the second size is drawn multiple times to obtain the wire material of the third size.

[0012] In some embodiments, the wire of the second size is drawn multiple times to obtain a wire of the third size, further comprising: The second size wire is vacuum annealed heat treated and coated with a water soluble lubricant before drawing.

[0013] Based on the same inventive concept, according to another aspect of the present invention, an embodiment of the present invention further provides a titanium alloy wire, and the titanium alloy wire is prepared by the method described in any one of the above embodiments.

[0014] The present invention has one of the following beneficial technical effects: the scheme proposed by the present invention adopts five-step forging to obtain a titanium alloy rod, the rod has a strong radial texture, improved ductility, and better resistance to diameter reduction when the rod is bent under special conditions, which is more conducive to the production of coil rolling and subsequent wire drawing processes. Moreover, the entire process of wire preparation is free of pickling and electrolysis, and there is no hydrogenation, oxygenation, or nitrogenation during the production process, and the component purity is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other embodiments can be obtained based on these drawings without paying creative work.

[0016] Figure 1 A schematic flow chart of a titanium alloy wire drawing preparation method provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0017] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the embodiments of the present invention are further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0018] It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are for distinguishing two non-identical entities with the same name or non-identical parameters. It can be seen that "first" and "second" are only for the convenience of expression and should not be understood as limitations on the embodiments of the present invention. The subsequent embodiments will not explain this one by one.

[0019] According to one aspect of the present invention, an embodiment of the present invention provides a method for drawing and preparing a titanium alloy wire, such as Figure 1 As shown, it may include the steps of: The titanium alloy ingot is subjected to first fire forging in sequence to obtain a first slab; Performing a second heat forging on the first slab to obtain a second slab; Performing a third heat forging on the second slab to obtain a third slab; Performing a fourth heat forging on the third slab to obtain a fourth slab; Performing a fifth fire forging on the fourth slab to obtain a rod; The rod is rolled, rotary forged and drawn to obtain a wire of final size.

[0020] The solution proposed by the present invention obtains titanium alloy rods by five-step forging. The rods have strong radial texture and improved ductility. When the rods are bent under special conditions, they also have better resistance to diameter reduction, which is more conducive to the production of coil rolling and subsequent wire drawing processes. Moreover, the entire process of wire preparation is free of pickling and electrolysis, and there is no hydrogenation, oxygenation, or nitrogenation during the production process, so the purity of the components is high.

[0021] In some embodiments, the titanium alloy ingot is subjected to a first fire forging in sequence to obtain a first slab, further comprising: The titanium alloy ingot is subjected to ingot body peeling, riser sawing and the edges and corners of the sawed parts are polished for smooth transition.

[0022] Specifically, a titanium alloy ingot with a unit weight of 2-4t (ingot shape Φ(720-750)mm×L) was used for three VAR smeltings, the ingot body was peeled, the riser end was sawn by 90-100mm, the arc start end was sawn by 20-40mm, and the edges and corners of the sawed parts were polished for a smooth transition.

[0023] In some embodiments, the titanium alloy ingot is subjected to a first fire forging in sequence to obtain a first slab, further comprising: Placing the titanium alloy ingot in a forging furnace, and keeping it at 800°C-850°C for 3-4 hours, then heating it to 1100°C-1200°C at a rate of 100°C-120°C / h, and keeping it at that temperature for 6-7 hours; After being taken out of the furnace, the slab is pressed radially into a slab of (380~400)mm×(800~900)mm×L, and then returned to the furnace and kept at 1100℃~1200℃ for 2~3h; After being taken out of the furnace, the slab is pressed again into a slab of (380~400)mm×(800~900)mm×L in the width direction, and then returned to the furnace and the temperature is lowered to 80℃~100℃ above the phase change point, and kept warm for 3~4h; After being taken out of the furnace, the steel is pressed again in the width direction into a slab of (380~400)mm×(800~900)mm×L, and then returned to the furnace for insulation for 3~4h; After being taken out of the furnace, the slab is pressed again in the width direction to be a slab of (380-400) mm× (800-900) mm×L, and the two ends are flattened, thrown out and air-cooled to obtain the first slab.

[0024] Specifically, the titanium alloy ingot is forged using a forging furnace, and the process is as follows: the furnace is charged at 800°C~850°C and kept warm for 3~4 hours, then the temperature is increased to 1100°C~1200°C at a rate of 100°C~120°C / h, and kept warm for 6~7 hours. After being discharged from the furnace, ① the ingot is pressed into a slab of (380~400)mm×(800~900)mm×L in the radial direction, and then returned to the furnace at the original temperature for 2~3h; ② after being discharged from the furnace, the slab is reversed and pressed into a slab of (380~400)mm×(800~900)mm×L in the width direction, and the temperature is then lowered to 80℃~100℃ above the phase change point in the post-heating furnace, and the slab is returned to the furnace for 3~4h; ③ after being discharged from the furnace, the slab is reversed and pressed again in the current width direction to a slab of (380~400)mm×(800~900)mm×L, and then returned to the furnace for 3~4h; ④ after being discharged from the furnace, the slab is reversed and pressed again in the current width direction to a slab of (380~400)mm×(800~900)mm×L, and both ends are flattened, thrown out for air cooling, the entire surface of the billet is polished, and the corners are smoothly transitioned.

[0025] In some embodiments, performing a second heat forging on the first slab to obtain a second slab further comprises: The first slab is placed in a forging furnace, and kept at 750°C to 800°C for 3 to 4 hours, and then heated at a rate of 60°C to 80°C / h to 40 to 50°C below the phase transition point, and kept at this temperature for 5 to 6 hours; After being taken out of the furnace, the slab is pressed into a slab of (380~400)mm×(800~900)mm×L in the width direction, and then returned to the furnace and kept at 40~50℃ below the phase change point for 2~3h; After being taken out of the furnace, the steel is pressed again in the width direction to form a slab of (380~400)mm×(800~900)mm×L, and then returned to the furnace and kept at 40~50℃ below the phase change point for 2~3h; After being taken out of the furnace, the slab is pressed again in the width direction to be a slab of (380-400) mm×(800-900) mm×L, and the two ends are flattened, thrown out and air-cooled to obtain the second slab.

[0026] Specifically, the first slab is forged in an electric heating furnace, and the process is as follows: 750℃~800℃ is charged into the furnace for 3~4h, and then the temperature is raised to 40~50℃ below the phase change point at a rate of 60℃~80℃ / h, and the temperature is kept for 5~6h. After leaving the furnace, ① the slab is pressed into a slab of (380~400)mm×(800~900)mm×L along the width direction, and the original temperature is returned to the furnace for 2~3h; ② after leaving the furnace, the slab is pressed into a slab of (380~400)mm×(800~900)mm×L along the width direction again, and the original temperature is returned to the furnace for 2~3h; ③ after leaving the furnace, the slab is pressed into a slab of (380~400)mm×(800~900)mm×L along the width direction again, and the original temperature is returned to the furnace for 2~3h; ③ after leaving the furnace, the slab is pressed into a slab of (380~400)mm×(800~900)mm×L along the width direction again, and the two ends are flattened, thrown out for air cooling, and the entire surface of the billet is polished, and the corners are smoothly transitioned.

[0027] In some embodiments, performing a third heat forging on the second slab to obtain a third slab further comprises: The second slab is placed in a forging furnace, and kept at 800°C to 850°C for 3 to 4 hours, and then heated at a rate of 80°C to 100°C / h to 40 to 60°C above the phase transition point, and kept at this temperature for 5 to 6 hours; After being taken out of the furnace, the slab is pressed into a slab of (380~400)mm×(800~900)mm×L in the width direction, and then returned to the furnace and kept at 40~60℃ above the phase change point for 2~3h; After being taken out of the furnace, the steel is pressed again in the width direction to form a slab of (380~400)mm×(800~900)mm×L, and then returned to the furnace and kept at 40~60℃ above the phase change point for 2~3h; After being taken out of the furnace, the slab is pressed again in the width direction to form a slab of (380-400) mm×(800-900) mm×L, and the two ends are flattened, thrown out and air-cooled to obtain the third slab.

[0028] Specifically, the second slab is forged by an electric heating furnace, and the process is as follows: 800℃~850℃ is charged into the furnace for 3~4h, and then the temperature is raised to 40~60℃ above the phase change point at a rate of 80℃~100℃ / h, and the temperature is kept for 5~6h. After leaving the furnace, ① the slab is pressed into a slab of (380~400)mm×(800~900)mm×L along the width direction, and the original temperature is returned to the furnace for 2~3h; ② after leaving the furnace, the slab is pressed into a slab of (380~400)mm×(800~900)mm×L along the width direction again, and the original temperature is returned to the furnace for 2~3h; ③ after leaving the furnace, the slab is pressed into a slab of (380~400)mm×(800~900)mm×L along the width direction again, and the original temperature is returned to the furnace for 2~3h; ③ after leaving the furnace, the slab is pressed into a slab of (380~400)mm×(800~900)mm×L along the width direction again, and the two ends are flattened, thrown out for air cooling, and the entire surface of the billet is polished, and the corners are smoothly transitioned.

[0029] In some embodiments, performing a fourth heat forging on the third slab to obtain a fourth slab further comprises: The third slab is placed in a forging furnace, and kept at 750°C to 800°C for 3 to 4 hours, and then heated at a rate of 60°C to 80°C / h to 50 to 60°C below the phase transition point, and kept at this temperature for 5 to 6 hours; After being taken out of the furnace, the slab is pressed into a slab of (380~400)mm×(800~900)mm×L in the width direction, and then returned to the furnace and kept at 50~60℃ below the phase change point for 2~3h; After being taken out of the furnace, the steel is pressed again in the width direction to form a slab of (380~400)mm×(800~900)mm×L, and then returned to the furnace and kept at 50~60℃ below the phase change point for 2~3h; After being taken out of the furnace, the slab is pressed again in the width direction to be a slab of (380-400) mm×(800-900) mm×L, and the two ends are flattened, thrown out and air-cooled to obtain the fourth slab.

[0030] Specifically, the third slab is forged by an electric heating furnace, and the process is as follows: 750℃~800℃ is charged into the furnace for 3~4h, and then the temperature is raised to 50~60℃ below the phase change point at a rate of 60℃~80℃ / h, and the temperature is kept for 5~6h. After leaving the furnace, ① the slab is pressed into a slab of (380~400)mm×(800~900)mm×L along the width direction, and the original temperature is returned to the furnace for 2~3h; ② after leaving the furnace, the slab is pressed into a slab of (380~400)mm×(800~900)mm×L along the width direction again, and the original temperature is returned to the furnace for 2~3h; ③ after leaving the furnace, the slab is pressed into a slab of (380~400)mm×(800~900)mm×L along the width direction again, and the original temperature is returned to the furnace for 2~3h; ③ after leaving the furnace, the slab is pressed into a slab of (380~400)mm×(800~900)mm×L along the width direction again, and the two ends are flattened, thrown out for air cooling, and the entire surface of the billet is polished, and the corners are smoothly transitioned.

[0031] In some embodiments, performing a fifth fire forging on the fourth slab to obtain a rod further comprises: The fourth slab is placed in a forging furnace, and kept at 750°C to 800°C for 1 to 2 hours, and then heated at a rate of 60°C to 80°C / h to 40 to 50°C below the phase transition point, and kept at this temperature for 3 to 4 hours; After being taken out of the furnace, it is stretched and forged until a bar of Φ(200~230)mm×L is obtained.

[0032] Specifically, the fourth slab is forged in an electric heating furnace, and the process is as follows: the furnace is charged at 750℃~800℃ for 1~2h, and then the temperature is raised at a rate of 60℃~80℃ / h to 40~50℃ below the phase change point, and the temperature is kept for 3~4h. After leaving the furnace, the billet is stretched and rounded to be forged into a bar of Φ(200~230)mm×L.

[0033] In some embodiments, the rod is rolled, swaged, and drawn to obtain a wire of a final size, further comprising: The bar is rolled by using a second-heat rolling mill to obtain a wire rod of a first size; The wire rod of the first size is peeled and then subjected to multiple passes of rotary forging to obtain a wire rod of the second size; The wire material of the second size is drawn multiple times to obtain the wire material of the third size.

[0034] In some embodiments, the wire of the second size is drawn multiple times to obtain a wire of the third size, further comprising: The second size wire is vacuum annealed heat treated and coated with a water soluble lubricant before drawing.

[0035] Specifically, the surface of the bar is polished to a metallic luster and without visible defects, and then placed in a heating furnace for heating and rolling to obtain a wire rod. The rolling adopts a two-fire rolling process, with the first fire rolling temperature of 850-900°C, insulation for 2 hours, rolling speed of 2m / s, final rolling size of Φ60mm, 13 rolling passes, and rolling deformation of 75%. The second fire rolling temperature is 800-850°C, insulation for 2 hours, 10 rolling passes, final rolling size of Φ10mm, and rolling deformation of 97%.

[0036] After the second hot rolling, the billet is rotary forged to obtain the wire rod. Before the rotary forging work is carried out, the wire rod needs to be rounded and peeled. The rounding is performed by a hot drawing machine at 800°C to remove the ear defects on the surface of the material. The size after rounding is Φ9.5mm. The peeling is performed by a centerless grinding lathe to remove the oxide scale and surface defects on the surface of the material. The size after peeling is Φ9.0mm. Then a rotary forging machine is used to reduce the diameter of the Φ9.0mm wire to Φ5.5mm through 7 passes, with a diameter reduction of 0.5mm each time. Hydraulic oil is used for lubrication during the rotary forging process. The rotary forging rate is not more than 0.5 / min, and no heat treatment is required during the rotary forging process.

[0037] After rotary forging, in order to facilitate subsequent roller die drawing, the wire needs to be vacuum annealed and heat treated. The heat treatment temperature of the wire should be 700℃~810℃, the holding time is 1h~2h, and the cooling method is water cooling. Before roller die drawing, a water-soluble lubricant needs to be evenly applied on the wire. In the process of reducing the diameter of the Φ5.5mm wire to Φ1.8-2.0mm, the diameter of the Φ5.5mm wire is reduced to Φ4.3-Φ4.9mm, Φ3.5-Φ3.9mm and Φ2.0-Φ2.4mm in turn, so as to obtain the final wire, and no heat treatment is required during the roller die drawing process.

[0038] Embodiment 1: Step 1, billet preparation: TB13 titanium alloy with a unit weight of 2 t (ingot shape Φ720mm×L) is used for three VAR melting and casting. The ingot body is peeled, the riser end is sawn 100mm, the arc start end is sawn 20mm, and the edges and corners of the sawed parts are polished for smooth transition.

[0039] Step 2, first fire forging: The ingot is heated by an electric heating furnace, and the temperature is kept at 800℃ for 3h, and then the temperature is raised to 1100℃ at a rate of 100℃ / h, and kept for 6h. After leaving the furnace, ① the ingot is pressed into a 380mm×800mm×L slab along the radial direction, and then returned to the original temperature for 2h; ② after leaving the furnace, the slab is pressed again in the width direction to be a 380mm×800mm×L slab, and then the temperature is heated to 80℃ above the phase change point, and the slab is returned to the furnace for 3h; ③ after leaving the furnace, the slab is pressed again in the current width direction to be a 380mm×800mm×L slab, and then returned to the furnace for 3h; ④ after leaving the furnace, the slab is pressed again in the current width direction to be a 380mm×800mm×L slab, and the two ends are flattened, thrown out for air cooling, the entire surface of the billet is polished, and the corners are smoothly transitioned.

[0040] Step 3, second forging: The billet obtained in the previous step is heated by an electric heating furnace for forging, and the furnace is charged at 750℃ for 3h, and then the temperature is raised to 40℃ below the phase change point at a rate of 60℃ / h, and the temperature is kept for 5h. After leaving the furnace, ① the slab is pressed into a 380mm×800mm×L slab in the width direction, and the original temperature is returned to the furnace for 2h; ② After leaving the furnace, the slab is pressed into a 380mm×800mm×L slab in the width direction again, and the original temperature is returned to the furnace for 2h; ③ After leaving the furnace, the slab is pressed into a 380mm×800mm×L slab in the width direction again, and the two ends are flattened, thrown out for air cooling, and the entire surface of the billet is polished, and the corners are smoothly transitioned. Step 4, third forging: The billet obtained in the previous step is heated by an electric heating furnace forging, and the furnace is charged at 800℃ for 3h, and then the temperature is raised to 40℃ above the phase change point at a rate of 80℃ / h, and the temperature is kept for 5h. After coming out of the furnace, ① the slab is pressed into a slab of 380mm×800mm×L along the width direction, and returned to the furnace to keep warm for 2h at the original temperature; ② After coming out of the furnace, the slab is pressed into a slab of 380mm×800mm×L along the width direction again, and returned to the furnace to keep warm for 2h at the original temperature; ③ After coming out of the furnace, the slab is pressed into a slab of 380mm×800mm×L along the width direction again, the two ends are leveled, thrown out for air cooling, the entire surface of the billet is polished, and the corners are smoothly transitioned.

[0041] Step 5, fourth fire forging: The billet obtained in the previous step is heated by an electric heating furnace for forging, and the temperature is kept at 750℃ for 3h, and then the temperature is raised to 50℃ below the phase change point at a rate of 60℃ / h, and kept for 5h. After leaving the furnace, ① the slab is pressed into a 380mm×800mm×L slab in the width direction, and the original temperature is returned to the furnace for 2h; ② After leaving the furnace, the slab is pressed into a 380mm×800mm×L slab in the width direction again, and the original temperature is returned to the furnace for 2~3h; ③ After leaving the furnace, the slab is pressed into a 380mm×800mm×L slab in the width direction again, and the two ends are flattened, thrown out for air cooling, and the entire surface of the billet is polished, and the corners are smoothly transitioned.

[0042] Step 6, fifth forging: The billet obtained in the previous step is heated by an electric heating furnace, and the furnace is kept at 750℃ for 1h, and then the temperature is raised to 40℃ below the phase change point at a rate of 60℃ / h, and kept for 3h. After leaving the furnace, the billet is stretched and rounded to forge into a bar of Φ210mm×L.

[0043] Step 7: After the forged bar in step 6 is surface treated, it is rolled using a reciprocating rolling mill. The first rolling temperature is 850°C, heat preservation for 2 hours, rolling speed is 2m / s, final rolling size is Φ60mm, rolling passes are 13 times, and rolling deformation is 75%. The second rolling temperature is 800°C, heat preservation for 2 hours, rolling passes are 10 times, final rolling size is Φ10mm, and rolling deformation is 97%.

[0044] Step 8: The wire rod in step 7 is subjected to the rounding and peeling process. Then, a rotary forging machine is used to reduce the diameter of the Φ9.0mm wire to Φ5.5mm through 7 passes, with a diameter reduction of 0.5mm each pass. Hydraulic oil is used for lubrication during the rotary forging process. The rotary forging wire feeding rate is not greater than 0.5 / min, and no heat treatment is required during the rotary forging process.

[0045] Step 9: The intermediate wire obtained in step 8 is subjected to vacuum annealing heat treatment. The heat treatment temperature should be 690~720℃, the insulation time is 1h~2h, and the cooling method is water cooling.

[0046] Step 10: Apply water-soluble lubricant evenly to the wire after annealing in step 9, and then perform roller die drawing. Use a continuous drawing roller die drawing machine to reduce the diameter of the Φ5.5mm wire to Φ1.8mm through multiple passes.

[0047] The Φ1.8 mm drawn TB134 wire prepared in this embodiment has high dimensional accuracy, a tolerance within 0-0.02 mm, a surface roughness Ra≤0.5 μm, and high drawing efficiency, which is beneficial to subsequent processing and production.

[0048] Embodiment 2: Step 1. Billet preparation: TB13 titanium alloy with a unit weight of 3t is used for three VAR melting and casting. The ingot body is peeled, the riser end is sawn 90mm, the arc start end is sawn 30mm, and the edges and corners of the sawed parts are polished for smooth transition.

[0049] Step 2, first fire forging: The ingot is heated by an electric heating furnace, and the furnace is charged and kept at 830℃ for 3.5h, then the temperature is increased to 1150℃ at a rate of 110℃ / h and kept for 6.5h. After being taken out of the furnace, ① the ingot is pressed into a 390mm×850mm×L slab along the radial direction, and then returned to the original temperature for 2.3 hours; ② after being taken out of the furnace, the slab is reversed and pressed again along the width direction into a 390mm×850mm×L slab, and then the temperature is raised to 90°C above the phase change point in the heating furnace, and the slab is returned to the furnace for 3~4 hours; ③ after being taken out of the furnace, the slab is reversed and pressed again along the current width direction into a 390mm×850mm×L slab, and then returned to the furnace for 3~4 hours; ④ after being taken out of the furnace, the slab is reversed and pressed again along the current width direction into a 390mm×850mm×L slab, the two ends are leveled, thrown out for air cooling, the entire surface of the billet is polished, and the corners are smoothly transitioned.

[0050] Step 3, second forging: The billet obtained in the previous step is heated by an electric heating furnace, and is kept at 780℃ for 3.5h, then heated to 45℃ below the phase change point at a rate of 75℃ / h, and kept for 5.5h. After leaving the furnace, ① the slab is pressed into a 390mm×850mm×L slab in the width direction, and returned to the original temperature for 2.3h; ② After leaving the furnace, the slab is pressed into a 390mm×850mm×L slab in the width direction again, and returned to the original temperature for 2.3h; ③ After leaving the furnace, the slab is pressed into a 390mm×850mm×L slab in the width direction again, and the two ends are flattened, thrown out for air cooling, and the entire surface of the billet is polished, with smooth transition of corners.

[0051] Step 4, third forging: The billet obtained in the previous step is heated by an electric heating furnace, and is kept at 830℃ for 3.3h, then heated to 45℃ above the phase change point at a rate of 90℃ / h, and kept for 5.6h. After leaving the furnace, ① the slab is pressed into a 390mm×850mm×L slab in the width direction, and returned to the original temperature for 2.3h; ② After leaving the furnace, the slab is pressed into a 390mm×850mm×L slab in the width direction again, and returned to the original temperature for 2.3h; ③ After leaving the furnace, the slab is pressed into a 390mm×850mm×L slab in the width direction again, and the two ends are flattened, thrown out for air cooling, and the entire surface of the billet is polished, with smooth transition of corners.

[0052] Step 5, fourth fire forging: The billet obtained in the previous step is heated by an electric heating furnace, and the temperature is kept at 780℃ for 3.5h, and then the temperature is raised to 55℃ below the phase change point at a rate of 70℃ / h, and kept for 5.5h. After leaving the furnace, ① the slab is pressed into a 390mm×850mm×L slab in the width direction, and the original temperature is returned to the furnace for 2~3h; ② After leaving the furnace, the slab is pressed into a 390mm×850mm×L slab in the width direction again, and the original temperature is returned to the furnace for 2~3h; ③ After leaving the furnace, the slab is pressed into a 390mm×850mm×L slab in the width direction again, and the two ends are flattened, thrown out for air cooling, and the entire surface of the billet is polished, and the corners are smoothly transitioned.

[0053] Step 6, fifth forging: The billet obtained in the previous step is heated by an electric heating furnace, and the temperature is kept at 780℃ for 1.5 hours, and then the temperature is raised to 45℃ below the phase change point at a rate of 75℃ / h, and kept for 3.5 hours. After leaving the furnace, the billet is stretched and rounded to be forged into a bar of Φ210mm×L.

[0054] Step 7: After the forged bar in step 6 is surface treated, it is rolled using a reciprocating rolling mill. The first rolling temperature is 850°C, heat preservation for 2 hours, rolling speed is 2m / s, final rolling size is Φ60mm, rolling passes are 13 times, and rolling deformation is 75%. The second rolling temperature is 800°C, heat preservation for 2 hours, rolling passes are 10 times, final rolling size is Φ10mm, and rolling deformation is 97%.

[0055] Step 8: The wire rod in step 7 is subjected to the rounding and peeling process. Then, a rotary forging machine is used to reduce the diameter of the Φ9.0mm wire to Φ5.5mm through 7 passes, with a diameter reduction of 0.5mm each pass. Hydraulic oil is used for lubrication during the rotary forging process. The rotary forging wire feeding rate is not greater than 0.5 / min, and no heat treatment is required during the rotary forging process.

[0056] Step 9: The intermediate wire obtained in step 8 is subjected to vacuum annealing heat treatment. The heat treatment temperature should be 690~720℃, the insulation time is 1h~2h, and the cooling method is water cooling.

[0057] Step 10: Evenly apply water-soluble lubricant to the wire after annealing in step 9, and then perform roller die drawing. The Φ5.5mm wire is reduced to Φ1.9mm through multiple passes using a continuous roller die drawing machine.

[0058] Embodiment 3: Step 1. Billet preparation: TB13 titanium alloy with a unit weight of 4t is used for three VAR melting and casting. The ingot body is peeled, the riser end is sawn by 95mm, the arc start end is sawn by 40mm, and the edges and corners of the sawed parts are polished for smooth transition.

[0059] Step 2, first fire forging: The ingot is heated by an electric heating furnace, and the ingot is charged and kept at 850℃ for 4h, and then heated to 1200℃ at a rate of 120℃ / h, and kept for 7h. After leaving the furnace, ① the ingot is pressed into a 400mm×900mm×L slab along the radial direction, and then returned to the furnace at the original temperature for 3h; ② after leaving the furnace, the slab is pressed again in the width direction to be a 400mm×900mm×L slab, and then the temperature is raised to 100℃ above the phase change point in the post-heating furnace, and the slab is returned to the furnace for 3~4h; ③ after leaving the furnace, the slab is pressed again in the current width direction to be a 400mm×900mm×L slab, and then returned to the furnace for 4h; ④ after leaving the furnace, the slab is pressed again in the current width direction to be a 400mm×900mm×L slab, and the two ends are flattened, thrown out for air cooling, the entire surface of the billet is polished, and the corners are smoothly transitioned.

[0060] Step 3, second forging: The billet obtained in the previous step is heated by an electric heating furnace for forging, and the furnace is charged with 800℃ for 4h, and then the temperature is raised to 50℃ below the phase change point at a rate of 80℃ / h, and the temperature is kept for 6h. After leaving the furnace, ① the slab is pressed into a 400mm×900mm×L slab in the width direction, and the original temperature is returned to the furnace for 3h; ② After leaving the furnace, the slab is pressed into a 400mm×900mm×L slab in the width direction again, and the original temperature is returned to the furnace for 3h; ③ After leaving the furnace, the slab is pressed into a 400mm×900mm×L slab in the width direction again, and the two ends are flattened, thrown out for air cooling, and the entire surface of the billet is polished, and the corners are smoothly transitioned.

[0061] Step 4, third forging: The billet obtained in the previous step is heated by an electric heating furnace, and the temperature is kept at 850℃ for 4 hours, and then the temperature is raised to 60℃ above the phase change point at a rate of 100℃ / h, and kept for 6 hours. After leaving the furnace, ① the slab is pressed into a 400mm×900mm×L slab in the width direction, and the original temperature is returned to the furnace for 3 hours; ② After leaving the furnace, the slab is pressed into a 400mm×900mm×L slab in the width direction again, and the original temperature is returned to the furnace for 3 hours; ③ After leaving the furnace, the slab is pressed into a 400mm×900mm×L slab in the width direction again, and the two ends are flattened, thrown out for air cooling, and the entire surface of the billet is polished, and the corners are smoothly transitioned.

[0062] Step 5, fourth fire forging: The billet obtained in the previous step is heated by an electric heating furnace, and the furnace is charged with 800℃ for 4h, and then the temperature is raised to 60℃ below the phase change point at a rate of 80℃ / h, and the temperature is kept for 6h. After leaving the furnace, ① the slab is pressed into a 400mm×900mm×L slab in the width direction, and the original temperature is returned to the furnace for 3h; ② After leaving the furnace, the slab is pressed into a 400mm×900mm×L slab in the width direction again, and the original temperature is returned to the furnace for 3h; ③ After leaving the furnace, the slab is pressed into a 400mm×900mm×L slab in the width direction again, and the two ends are flattened, thrown out for air cooling, and the entire surface of the billet is polished, and the corners are smoothly transitioned.

[0063] Step 6, fifth forging: The billet obtained in the previous step is heated by an electric heating furnace, and the furnace is kept at 800℃ for 2 hours, and then the temperature is raised to 50℃ below the phase change point at a rate of 80℃ / h, and kept for 4 hours. After leaving the furnace, the billet is stretched and rounded to forge into a bar of Φ210mm×L.

[0064] Step 7: After the forged bar in step 6 is surface treated, it is rolled using a reciprocating rolling mill. The first rolling temperature is 850°C, heat preservation for 2 hours, rolling speed is 2m / s, final rolling size is Φ60mm, rolling passes are 13 times, and rolling deformation is 75%. The second rolling temperature is 800°C, heat preservation for 2 hours, rolling passes are 10 times, final rolling size is Φ10mm, and rolling deformation is 97%.

[0065] Step 8: The wire rod in step 7 is subjected to the rounding and peeling process. Then, a rotary forging machine is used to reduce the diameter of the Φ9.0mm wire to Φ5.5mm through 7 passes, with a diameter reduction of 0.5mm each pass. Hydraulic oil is used for lubrication during the rotary forging process. The rotary forging wire feeding rate is not greater than 0.5 / min, and no heat treatment is required during the rotary forging process.

[0066] Step 9: The intermediate wire obtained in step 8 is subjected to vacuum annealing heat treatment. The heat treatment temperature should be 720°C, the insulation time is 2h, and the cooling method is water cooling.

[0067] Step 10: Evenly apply water-soluble lubricant to the wire after annealing in step 9, and then perform roller die drawing. The Φ5.5mm wire is reduced to Φ2mm through multiple passes using a continuous drawing roller die drawing machine.

[0068] Based on the same inventive concept, according to another aspect of the present invention, an embodiment of the present invention further provides a titanium alloy wire, and the titanium alloy wire is prepared by the method described in any one of the above embodiments.

[0069] The above are exemplary embodiments disclosed in the present invention, but it should be noted that various changes and modifications may be made without departing from the scope disclosed in the embodiments of the present invention as defined in the claims. The functions, steps and / or actions of the method claims according to the disclosed embodiments described herein do not need to be performed in any particular order. In addition, although the elements disclosed in the embodiments of the present invention may be described or required in individual form, they may also be understood as multiple unless explicitly limited to the singular.

[0070] It should be understood that, as used herein, the singular forms "a", "an" are intended to include the plural forms as well, unless the context clearly supports an exception. It should also be understood that, as used herein, "and / or" refers to any and all possible combinations including one or more of the associated listed items.

[0071] The serial numbers of the embodiments disclosed in the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0072] A person skilled in the art should understand that the discussion of any of the above embodiments is only exemplary and is not intended to imply that the scope of the disclosure of the embodiments of the present invention (including the claims) is limited to these examples; under the concept of the embodiments of the present invention, the technical features in the above embodiments or different embodiments can also be combined, and there are many other changes in different aspects of the above embodiments of the present invention, which are not provided in detail for the sake of simplicity. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present invention should be included in the protection scope of the embodiments of the present invention.

Claims

1. A method for drawing and preparing a titanium alloy wire, characterized in that: The following steps are involved: The titanium alloy ingot is subjected to first fire forging in sequence to obtain a first slab; Performing a second heat forging on the first slab to obtain a second slab; Performing a third heat forging on the second slab to obtain a third slab; Performing a fourth heat forging on the third slab to obtain a fourth slab; Performing a fifth fire forging on the fourth slab to obtain a rod; The rod is rolled, rotary forged and drawn to obtain a wire of final size.

2. The method according to claim 1, characterized in that The titanium alloy ingot is subjected to first fire forging in sequence to obtain a first slab, further comprising: The titanium alloy ingot is subjected to ingot body peeling, riser sawing and the edges and corners of the sawed parts are polished for smooth transition.

3. The method according to claim 1, characterized in that The titanium alloy ingot is subjected to first fire forging in sequence to obtain a first slab, further comprising: Placing the titanium alloy ingot in a forging furnace, and keeping it at 800°C-850°C for 3-4 hours, then heating it to 1100°C-1200°C at a rate of 100°C-120°C / h, and keeping it at that temperature for 6-7 hours; After being taken out of the furnace, the slab is pressed radially into a slab of (380~400)mm×(800~900)mm×L, and then returned to the furnace and kept at 1100℃~1200℃ for 2~3h; After being taken out of the furnace, the slab is pressed again into a slab of (380~400)mm×(800~900)mm×L in the width direction, and then returned to the furnace and the temperature is lowered to 80℃~100℃ above the phase change point, and kept warm for 3~4h; After being taken out of the furnace, the steel is pressed again in the width direction into a slab of (380~400)mm×(800~900)mm×L, and then returned to the furnace for insulation for 3~4h; After being taken out of the furnace, the slab is pressed again in the width direction to be a slab of (380-400) mm× (800-900) mm×L, and the two ends are flattened, thrown out and air-cooled to obtain the first slab.

4. The method according to claim 1, characterized in that Performing a second heat forging on the first slab to obtain a second slab further comprises: The first slab is placed in a forging furnace, and kept at 750°C to 800°C for 3 to 4 hours, and then heated at a rate of 60°C to 80°C / h to 40 to 50°C below the phase transition point, and kept at this temperature for 5 to 6 hours; After being taken out of the furnace, the slab is pressed into a slab of (380~400)mm×(800~900)mm×L in the width direction, and then returned to the furnace and kept at 40~50℃ below the phase change point for 2~3h; After being taken out of the furnace, the steel is pressed again in the width direction to form a slab of (380~400)mm×(800~900)mm×L, returned to the furnace and kept at 40~50℃ below the phase change point for 2~3h; After being taken out of the furnace, the slab is pressed again in the width direction to form a slab of (380-400) mm×(800-900) mm×L, and the two ends are flattened, thrown out and air-cooled to obtain the second slab.

5. The method according to claim 1, characterized in that The third slab is forged by a third heat forging process on the second slab to obtain a third slab, further comprising: The second slab is placed in a forging furnace, and kept at 800°C to 850°C for 3 to 4 hours, and then heated at a rate of 80°C to 100°C / h to 40 to 60°C above the phase transition point, and kept at this temperature for 5 to 6 hours; After being taken out of the furnace, the slab is pressed into a slab of (380~400)mm×(800~900)mm×L in the width direction, and then returned to the furnace and kept at 40~60℃ above the phase change point for 2~3h; After being taken out of the furnace, the steel is pressed again in the width direction to form a slab of (380~400)mm×(800~900)mm×L, and then returned to the furnace and kept at 40~60℃ above the phase change point for 2~3h; After being taken out of the furnace, the slab is pressed again in the width direction to form a slab of (380-400) mm×(800-900) mm×L, and the two ends are flattened, thrown out and air-cooled to obtain the third slab.

6. The method according to claim 1, characterized in that Performing a fourth heat forging on the third slab to obtain a fourth slab further comprises: The third slab is placed in a forging furnace, and kept at 750°C to 800°C for 3 to 4 hours, and then heated at a rate of 60°C to 80°C / h to 50 to 60°C below the phase transition point, and kept at this temperature for 5 to 6 hours; After being taken out of the furnace, the slab is pressed into a slab of (380~400)mm×(800~900)mm×L in the width direction, and then returned to the furnace and kept at 50~60℃ below the phase change point for 2~3h; After being taken out of the furnace, the steel is pressed again in the width direction to form a slab of (380~400)mm×(800~900)mm×L, and then returned to the furnace and kept at 50~60℃ below the phase change point for 2~3h; After being taken out of the furnace, the slab is pressed again in the width direction to be a slab of (380-400) mm×(800-900) mm×L, and the two ends are flattened, thrown out and air-cooled to obtain the fourth slab.

7. The method according to claim 1, characterized in that The fourth slab is subjected to a fifth fire forging to obtain a bar, further comprising: The fourth slab is placed in a forging furnace, and kept at 750°C to 800°C for 1 to 2 hours, and then heated at a rate of 60°C to 80°C / h to 40 to 50°C below the phase transition point, and kept at this temperature for 3 to 4 hours; After being taken out of the furnace, it is stretched and forged until a bar of Φ(200~230)mm×L is obtained.

8. The method according to claim 1, characterized in that The rod is rolled, rotary forged, and drawn to obtain a wire of final size, further comprising: The bar is rolled by using a second-heat rolling mill to obtain a wire rod of a first size; The wire rod of the first size is peeled and then subjected to multiple passes of rotary forging to obtain a wire rod of the second size; The wire material of the second size is drawn multiple times to obtain the wire material of the third size.

9. The method according to claim 8, characterized in that Drawing the wire of the second size multiple times to obtain the wire of the third size further comprises: The second size wire is vacuum annealed heat treated and coated with a water soluble lubricant before drawing.

10. A titanium alloy wire, characterized in that: The titanium alloy wire is prepared based on the method according to any one of claims 1 to 9.

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