Titanium alloy wire rolling method

Abstract

The invention discloses a titanium alloy wire rolling method which adopts a titanium alloy wire rod rolled by a continuous rolling line to produce a titanium alloy wire with the diameter of 2-4mm. A titanium alloy wire rod with the diameter of 8 mm is adopted as a raw material, and the method comprises the following procedures of paying off, wire feeding and straightening, induction heating, rolling, taking up and packaging. Medium-frequency induction heating and high-frequency induction heating are adopted, after a wire passes through an induction coil at a high speed, the temperature of the wire can be increased to the required temperature, the requirement for continuous rolling rapid heating is met, the heated wire is fed into a continuous rolling machine to be rolled, and according to different specifications of finished products, a fourth rack, a sixth rack and an eighth rack are selected for rolling; and after rolling is completed, the titanium wire passes through a tension bracket and is finally wound up by a take-up machine, and the titanium alloy wire with the diameter being 2-4 mm is obtained. The method is particularly suitable for production of titanium alloy and high-temperature alloy wires difficult to deform, the titanium alloy filaments are produced in a continuous rolling mode, the production efficiency can be greatly improved, the cost is reduced, and the yield is increased.

Description

Technical Field

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

[0002] Titanium alloy wire is widely used in many fields due to its high specific strength, good corrosion resistance, low thermal conductivity, good high and low temperature resistance, and good biocompatibility, including standard parts, biomedicine, aerospace, chemical industry, 3C electronics and automobile manufacturing.

[0003] At present, the titanium alloy wire produced by continuous rolling line can reach a single weight of more than 100 kilograms, but the minimum diameter of titanium alloy wire produced by continuous rolling line is about 8mm, and the minimum diameter of pure titanium is about 6.5mm. Smaller wire can only be further processed on the basis of the existing 8mm titanium alloy wire; At present, the main production methods of titanium and titanium alloy wire with a diameter of less than 8mm are as follows: Fixed die hot drawing processing: The titanium alloy coil rolled on the continuous rolling line is peeled to remove the surface hot rolling defects and oxide layer, and a special lubricant is evenly coated on the surface of the coil. The coil is then heated by a tubular heating furnace and drawn through fixed dies with different hole types. The drawing speed is 2 to 6 meters per minute. It takes more than 10 hot drawing passes to process 8mm diameter wire to 3mm. The finished product needs to be peeled, ground and polished to remove the lubricant contamination layer or oxide layer on the wire surface, and a bright wire product can be produced. The production cycle of titanium alloy wire produced by this method is long, the efficiency is low, and the lubricant will generate dust during the drawing process, and the production site environment is poor.

[0004] Roller die cold drawing process: The titanium alloy coil rolled by the continuous rolling line is factory annealed according to the subsequent processing requirements, and then the surface hot rolling defects and oxide layer are removed by peeling to obtain a bright metal surface. A roller die wire drawing machine is used, which can usually draw three dies at a time to produce rods and wires of different diameters. If multiple drawing processes are required, vacuum annealing or protective atmosphere annealing is required to eliminate the processing stress according to the processing rate during the processing, and then subsequent drawing passes can be carried out. Finally, the finished product is annealed, the surface is peeled, and polished to obtain the finished wire. When this method is used to produce titanium alloy wire, the efficiency of roller die drawing is slightly higher than that of fixed die hot drawing, but a large number of annealing furnaces are required for intermediate annealing, and the annealing time is longer. The overall efficiency is slightly higher than that of fixed die hot drawing.

[0005] In view of the above, it is necessary to propose a titanium alloy wire rolling method to solve the above problems. Summary of the invention

[0006] The purpose of the present invention is to overcome the defects in the prior art and provide a titanium alloy wire rolling method.

[0007] To achieve the above object, the technical solution of the present invention is as follows: A titanium alloy wire rolling method, comprising the following steps: Step 1: Using titanium alloy disc as raw material, remove surface defects, i.e. oxide layer, by peeling; Step 2: Put the titanium alloy raw material on the pay-off rack. Measure the raw material size several times before putting it on the pay-off rack. Visually check that there are no defects on the surface. Place the wire rod on the back side of the pay-off rack. Step 3: Wire feeding and straightening: pass the head of the raw wire through the straightening wheel, wire guide tube, and pinch roller in sequence, and adjust the straightening machine parameters to ensure the straightness of the wire; Step 4: Induction heating, the raw material wire passes through the medium frequency heater and the high frequency heater in turn. The heating temperature of the raw material wire is: 700~900℃ for pure titanium and 750~1000℃ for titanium alloy; Step 5: rolling, the heated wire rod enters the continuous rolling mill for continuous rolling, and the number of rolling passes is not less than four times; Step 6: Wire taking-up. The titanium wire after rolling passes through the tension rack to maintain the tension during the wire rolling process and control the wire forward speed; finally, the wire is taken up by the wire taking-up confidential row to obtain a titanium alloy wire with a diameter of 2~4mm.

[0008] Furthermore, in step 1, a centerless lathe is used to remove surface defects of the raw material wire, and the surface defects are checked and completely removed to obtain raw materials that meet the standards.

[0009] Furthermore, the wire-paying equipment in step 2 includes a duckbill-type wire-paying stand and a disordered wire alarm device; the raw material size measurement includes measuring the head, middle, and tail of the titanium alloy coil and taking the average value; visually inspecting the surface to ensure there are no defects or broken ends, and multiple ends need to be welded in advance.

[0010] Furthermore, in step 3, the air pressure of the clamping cylinder is not less than 0.2 Mpa, and the raw material is clamped without slipping.

[0011] Furthermore, the medium frequency heater and the high frequency heater described in step 4 are provided with mica tubes, and the raw material wire passes through the mica tubes for induction heating; The straightened raw material moves forward in the mica tube at a certain speed and enters the medium frequency heating coil first. The medium frequency heater starts after a certain delay to heat the raw material. The medium frequency start delay time is determined by the running speed of the raw material and the distance from the head of the raw material to the first heating coil. The temperature out of the medium frequency heater is not less than 580℃. The raw materials heated by medium frequency enter the high frequency heating coil. The high frequency heater starts after a certain delay and continues to heat the raw materials. The high frequency start delay time is determined by the running speed of the raw materials and the distance from the head of the raw materials to the exit of the last high frequency heating coil. The temperature out of the medium frequency is not less than 880℃.

[0012] Furthermore, in step 5, a continuous rolling mill is used, and the continuous rolling mill has 8 horizontal and vertical alternating twist-free rolling mills. The rolling accuracy of the rolling mill is improved by using a separate transmission. The speed of each machine can be adjusted separately, and the push-pull relationship between the frames is adjustable.

[0013] Furthermore, in step 6, an inner trunk wire take-up machine is used, and the maximum wire take-up speed is no more than 10 m / s.

[0014] Furthermore, the method further comprises step 7, annealing and surface treatment, wherein the annealing temperature is between 600° C. and 800° C., and the surface treatment comprises one or more of polishing, anodizing, sandblasting, and coating.

[0015] The advantages and beneficial effects of the present invention are: 1. The present invention is particularly suitable for the production of titanium alloy and hard-to-deform high-temperature alloy wires. The continuous rolling method for producing titanium alloy filaments can greatly improve production efficiency, reduce costs, and increase yield rate.

[0016] 2. The continuous rolling mill adopts 8 horizontal and vertical alternating non-twisting rolling mills. The rolling accuracy of the rolling mill is improved by using a separate transmission. The speed of each machine can be adjusted individually, and the push-pull relationship between the frames is easy to adjust.

[0017] 3. The induction heating method is adopted, which has high heating efficiency and a thin oxide layer on the surface of the material, which is convenient for subsequent surface treatment.

[0018] 4. It avoids the drawbacks of coating lubricants in fixed die hot drawing processing, and there is no need to subsequently clean the finished product to remove the lubricant. The hot-drawn product surface has obvious traces of pulling and scraping, and subsequent grinding, polishing and other operations on the surface of the finished product must be performed. The continuous rolling used in the present invention makes the surface quality of the finished product good, there is no production division on the production site, the consumption of raw materials is reduced, the production efficiency is high, and the yield rate is high.

[0019] 5. Compared with the roller die cold drawing technology, the present invention adopts high-frequency heating technology to heat the raw material to the rolling temperature at one time, and performs continuous rolling, which has a good forming effect, avoids the operation of annealing in the middle to eliminate stress, and has high processing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of a process of a titanium alloy wire rolling method of the present invention; DETAILED DESCRIPTION

[0021] The specific implementation of the present invention is further described below in conjunction with the accompanying drawings and embodiments. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0022] The present invention discloses a titanium alloy wire rolling method, which uses a titanium alloy coil with a diameter of 8 mm produced by a continuous rolling line as a raw material, and can also use various titanium alloys and high-temperature alloys with a smaller diameter of 6.5 mm as raw materials, and the performance meets the corresponding national standards. The raw wire is stripped by a centerless lathe to remove surface hot rolling defects and oxide layers, and the surface defects are checked and completely removed.

[0023] The titanium alloy wire is rolled according to the following process: Figure 1 As shown, the specific process includes: wire paying-off → wire feeding and straightening → induction heating → rolling → wire taking-up → packaging.

[0024] The wire-paying equipment includes a wire-paying rack and a wire-disordered alarm device. The wire-paying rack is a duckbill type wire-paying rack, and the wire-disordered alarm device realizes the alarm function by a proximity switch.

[0025] Specifically, the size of the raw materials should be measured several times before they are placed on the pay-off rack (test the head, middle, and tail separately and take the average value), and the data should be reported to the main console for record. Visually inspect the surface for defects, such as ears, scars, etc., and visually inspect for multiple ends (broken wires). Multiple ends need to be welded in advance. After checking that there are no abnormalities in the raw materials, the wire rods should be placed on the pay-off rack at the back, and the distance from the rear baffle should be no less than 50 cm, so that the tail of the raw material wire can be exposed for welding. During production, at least one employee is next to the pay-off rack, using homemade tools to arrange the wire rods in order in circles to avoid knots. When about one-third of each bundle of raw materials is left, it is necessary to find the tail of the raw material wire and the head of another bundle of raw material wire and notify the welder to weld.

[0026] During the wire laying and feeding process, you can use the SS250 wire feeder, which includes a straightener and a pinch roller. Pass the head of the wire through the straightening wheel, wire guide tube, and pinch roller in sequence. When the head of the wire is in the right position, tighten the pinch roller. Adjust the parameters of the straightener to ensure the straightness of the wire. The specific operations are as follows:

[0027] (1) When operating, first loosen the pinch roller cylinder, pass the wire head through the straightening wheel, wire guide tube, and pinch roller in turn, and tighten the pinch roller when the wire head is in the right position.

[0028] (2) According to the diameter of the raw wire, appropriately adjust the clamping degree of the straightening wheel until the raw wire is straight after straightening.

[0029] (3) The air pressure of the pinch roller cylinder shall not be less than 0.2Mpa, and the raw material wire shall not slip when clamped.

[0030] (4) There are side control buttons on the lower right side of the wire feeder housing, including start, stop and emergency stop. When the main console is set to remote, the start and stop buttons can start and stop the pinch rollers separately. When the emergency stop button is pressed in special circumstances (such as heater failure, etc.), the entire line equipment can be stopped. It is strictly forbidden to press or accidentally touch this emergency stop button during normal production.

[0031] (5) The speed of the wire feeder is set and adjusted by the main console.

[0032] The present invention adopts the combination technology of medium frequency induction heating + high frequency induction heating, so that the wire material temperature can be quickly raised to the required temperature after passing through the induction coil at a uniform speed, meeting the demand for rapid heating of continuous rolling.

[0033] In actual implementation, the selected induction heater consists of a 500Kw medium frequency heater and a 200Kw high frequency heater. The medium frequency heater, i.e., the KGPS series induction heating equipment, is connected to 6 sets of induction coils on the heating table, and the high frequency, i.e., the IPS series induction heating equipment, is connected to 4 sets of induction coils, which are separated from the raw material wire by the phlogopite tube to achieve induction heating. The raw material wire runs forward in the mica tube, and the medium and high frequency heaters continuously output power, thereby continuously heating the raw material wire, and adjusting the power to make the raw material meet the rolling temperature requirements.

[0034] Whether the heating temperature is appropriate (especially the head temperature) is directly related to whether the material can be passed smoothly, and the control of the starting rolling temperature is a key link to ensure the performance of the finished product. Therefore, temperature control is the core of the heating process.

[0035] (1) The straightened raw wire runs forward in the mica tube at a certain speed and enters the medium frequency heating coil first. The medium frequency heater starts after a certain delay to heat the raw wire. In actual use, the raw wire is controlled to move at a speed not exceeding 120m / min and the feeding speed is maintained at a constant speed.

[0036] (2) The delay time of the medium frequency start-up is determined by the running speed of the raw material wire and the distance from the head of the raw material wire to the first heating coil, and can be adjusted on the main console operation interface. This setting is to ensure that when the wire reaches the heating area, the heater is in working state, thereby achieving precise heating control. Specifically, the specific algorithm of the delay time is as follows:

[0037] To measure the distance, first determine the actual distance (L) between the head of the raw wire and the first heating coil. Determine the wire speed: According to the set running speed of the wire in the mica tube (V), the unit is meter per minute (m / min) or meter per second (m / s); Calculate the delay: The delay time (T) can be calculated by the following formula: T = V / L. Among them, L is the distance, V is the wire speed, and T is the required delay time. Enter the calculated delay time into the operation interface of the main console so that the control system can accurately control the start timing of the medium frequency heater. After the first setting is completed, perform several test runs to observe the actual effect of the wire entering the heating zone. If necessary, adjust the delay time appropriately until the ideal heating effect is achieved. The starting power of the medium frequency heater needs to be manually set on the main console during linkage startup, and can be adjusted according to the temperature of the raw wire out of the medium frequency. The temperature out of the medium frequency is not less than 580℃.

[0038] (3) It is generally more reasonable to control the medium frequency starting voltage at 320V, and the medium frequency output temperature is controlled at around 630℃.

[0039] (4) The raw wire material that has been heated by medium frequency directly enters the high frequency heating coil. The high frequency heater starts after a certain delay after the medium frequency heater starts, and continues to heat the raw wire material.

[0040] The time for delaying the start of the medium-frequency and high-frequency heating coils in the steps (1) and (4) is 2-40 seconds. In this embodiment, the delay in starting the medium-frequency and high-frequency heating coils mainly means that after the wire begins to enter the medium-frequency heating coil, the heater is not started immediately for heating, but waits for a period of time before starting. This is for the following purposes: 1. Ensure temperature uniformity: Let the wire reach a relatively stable state before entering the heating zone, so as to ensure a more uniform temperature distribution during the heating process and avoid quality problems caused by excessive temperature difference between the front and rear wires.

[0041] 2. Equipment preheating: Give the system some preheating time so that the heater and its supporting cooling system can reach the working state smoothly, which helps to extend the service life of the equipment and reduce the occurrence of failures.

[0042] 3. Control accuracy: Delayed start can better control the time when heating starts, thereby accurately controlling the entire heating process and ensuring processing quality.

[0043] The delay time in actual production can be determined according to the actual production line conditions, including but not limited to the diameter of the wire, material properties, line speed, required heating temperature and other factors. This time ranges from 2 to 40 seconds. When in use, it can be adjusted through experiments as needed to ensure that both the production efficiency requirements and the product quality are met.

[0044] (5) The high-frequency start-up delay time is determined by the running speed of the raw material wire and the distance from the head of the raw material wire to the outlet of the last high-frequency heating coil. The high-frequency start-up delay time in this step can refer to the calculation method introduced in step (2). It can also be adjusted on the main console operation interface. The starting power of the high-frequency heater when starting needs to be manually set on the main console, and can be adjusted according to the high-frequency temperature of the raw material wire. The medium-frequency temperature is normally not less than 880°C (except for the head, which is generally 800°C).

[0045] (6) It is generally more reasonable to control the high-frequency starting voltage at 220V, and the temperature of the medium and high frequency is controlled according to the process requirements of each raw material. For example, if the target temperature of the titanium alloy wire is 800°C, the set temperature parameters can be: the lower limit of the temperature is 780°C; the upper limit of the temperature is 820°C; the temperature sensor is set in the heating zone, and the temperature sensor is connected to the PID controller and the data acquisition system; according to the results of the preliminary trial operation, the output power of the heater is adjusted to ensure that the temperature is stable at around 800°C; it can ensure that the temperature control during the medium and high frequency heating process meets the process requirements, thereby ensuring the quality and production efficiency of the product.

[0046] (7) When the temperature of the raw wire entering the high frequency is lower than 580°C, the high frequency cannot be started (low temperature protection).

[0047] (8) During normal production, the main console adjusts the medium and high frequency power according to the required temperature for rolling to meet the rolling temperature requirements.

[0048] The heated wire is sent to the continuous rolling mill for rolling. According to the different specifications of the finished products, 4-frame, 6-frame and 8-frame rolling mills are selected for rolling. In the specific implementation, 8-frame horizontal and vertical alternating twist-free rolling mills are used. 2. The roller ring parameters use GWJDX400-01-107 tungsten carbide cemented carbide roller rings; the roller ring size is 167mm×52mm×67mm.

[0049] The rolling mill is the key to the rolling process, which includes roller ring installation, guide and guard adjustment, material shape control, and finished product control.

[0050] In the process of titanium alloy wire rolling, especially when rolling titanium alloy wire with a diameter of 2 to 4 mm, the adjustment of the roll gap is particularly important because it directly affects the diameter and quality of the finished wire. The wire rolling size is small and the precision requirement is high; the adjustment of the roll gap in this embodiment includes manual adjustment, automatic thickness control, fine-tuning mechanism, temperature compensation, lubrication management, etc.; manual adjustment uses a worm gear mechanism or a reduction mechanism to roughly adjust the roll gap, and manual adjustment is used for coarse adjustment; automatic thickness control adjusts the roll gap size through sensor feedback to maintain the consistency of the wire diameter. In this embodiment, through the fine-tuning mechanism, a very fine adjustment device can be made during the rolling process of titanium alloy wire. Specifically, a screw jack or a precision screw mechanism can be used, and the roll gap can be adjusted with micron-level accuracy, thereby making the diameter of the titanium alloy wire product uniform; during the rolling process, the temperature will also have a certain impact. Due to the phenomenon of thermal expansion and contraction, the actual size of the wire may change under different temperature conditions. Therefore, it is necessary to consider the influence of material temperature on the roll gap setting and make adjustments through the fine-tuning mechanism. Lubrication not only helps to reduce friction and thus protect equipment, but also affects the flow characteristics of titanium alloy metal and the final forming effect. In this embodiment, lubricating oil is selected to indirectly help optimize the roll gap adjustment process and ensure the precision of titanium alloy rolled products.

[0051] The material type control comprises the following steps: (1) Adjustment of guide opening: After the rolling mill head leaves the frame, adjust the opening of the inlet guide according to the size of the material to avoid twisting of the material; (2) The roller ring pressure adjustment of the rolling mill is manual adjustment, and the pressure screw is adjusted with an adjustment wrench; (3) The adjustment amount of the 8 racks is the same: press down the screw to adjust 90°, the adjustment amount is 0.04mm, and turn one circle, the adjustment amount is 0.16mm; (4) Before adjusting the roller gap, determine the direction of pressing down and remove the positioning screws; (5) Before adjusting the roll gap, the main control console should be informed to clearly specify the number of adjustments to be made and the amount of adjustment to be made, so that the main control console can make speed adjustments; (6) Manual adjustment can be made only after confirming that the information with the main control is correct. After the adjustment is completed, insert the positioning screw; (7) During the rolling process, attention should be paid to the use of the guides, whether the material is twisted, whether the material size is normal, whether ears are produced, and timely adjustments should be made; (8) During the rolling process, the rolling mill speed and roll gap should be strictly controlled according to the rolling chart so that the workpiece is rolled under slight tension; Furthermore, after rolling, the titanium wire passes through the tension frame and is finally taken up by the wire take-up machine to obtain a titanium alloy wire with a diameter of 2~4mm. Specifically, a production line is equipped with two tension frames. The No. 1 tension frame is placed behind the No. 2 water tank, and the No. 2 tension frame is placed in front of the wire take-up machine. The specific composition and parameters are as follows: The tension frame consists of an inlet guide wheel, an outlet guide wheel, a fixed wheel, a moving wheel, a cylinder, etc., with a height of 2.5m and a cylinder pressure of 0.2Mpa. The role of the tension frame in the production process is to adjust or make up for the speed difference between the finished product frame and the wire take-up machine, especially when the rolling mill bites the material during the startup stage, the speed cannot be synchronized due to differences in the motor speed increase speed and signal delays. Therefore, the existence of the tension frame will play a role in adjusting the speed difference.

[0052] Specifically, the wire is fed in from the inlet guide wheel and the traction wire is extended to the inside (from the inside to the outside) through the lower wire wheel of the tension frame, and then through the wire groove corresponding to the upper wire wheel, and then through the second wire groove downward, and so on, until it comes out from the outermost side of the lower wire groove and enters the insulation box through the outlet wire wheel. Fill the wire grooves in order from inside to outside, and no gaps or omissions are allowed. The speed of the No. 1 tension frame and the insulation box motor is closely related, and the speed of the No. 2 tension frame and the wire take-up machine is closely related. Turn on the cooling gas of the tension wheel before starting the machine, and align the upper tension wheel. Before starting the machine, check and confirm whether the traction wires in the two tension frames are out of the groove or misaligned and entangled. If necessary, the machine can be turned on to pass the raw materials after they are dealt with. During production, ensure that all filaments pass through the wire grooves of the tension wheels and the grooves of the inlet and outlet wire wheels to prevent the surface of the filaments from being scratched by the grooves and affecting the quality of the finished product.

[0053] Hot-rolled titanium alloy wire can meet the delivery requirements of corresponding specifications after annealing and surface treatment. If there are requirements for finer specifications, hot-rolled 2mm wire is used as raw material. After annealing and surface treatment, it is cold-drawn by roller die to the required size.

[0054] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A titanium alloy wire rolling method, characterized in that: The following steps are involved: Step 1: Using titanium alloy disc as raw material, remove surface defects, i.e. oxide layer, by peeling; Step 2: Put the titanium alloy raw material on the pay-off rack. Measure the raw material size several times before putting it on the pay-off rack. Visually check that there are no defects on the surface. Place the wire rod on the back side of the pay-off rack. Step 3: Wire feeding and straightening: pass the head of the raw wire through the straightening wheel, wire guide tube, and pinch roller in sequence, and adjust the straightening machine parameters to ensure the straightness of the wire; Step 4: Induction heating, the raw material wire passes through the medium frequency heater and the high frequency heater in turn. The heating temperature of the raw material wire is: 700~900℃ for pure titanium and 750~1000℃ for titanium alloy; Step 5: rolling, the heated wire rod enters the continuous rolling mill for continuous rolling, and the number of rolling passes is not less than four times; Step 6: Wire taking-up. The titanium wire after rolling passes through the tension rack to maintain the tension during the wire rolling process and control the wire forward speed; finally, the wire is taken up by the wire taking-up confidential row to obtain a titanium alloy wire with a diameter of 2~4mm.

2. A titanium alloy wire rolling method according to claim 1, characterized in that: In the step 1, a centerless lathe is used to remove surface defects of the raw material wire, and the surface defects are checked and completely removed to obtain raw materials that meet the standards.

3. The titanium alloy wire rolling method according to claim 1, characterized in that: The wire-laying equipment in step 2 includes a wire-laying stand and a wire disorder alarm device; the raw material size measurement includes measuring the head, middle, and tail of the titanium alloy coil and taking the average value; the raw material surface is visually free of defects and broken ends, and multiple ends need to be welded in advance.

4. The titanium alloy wire rolling method according to claim 1, characterized in that: In step 3, the raw material is clamped so as not to slip.

5. The titanium alloy wire rolling method according to claim 1, characterized in that: The medium frequency heater and the high frequency heater described in step 4 are provided with mica tubes, and the raw material wire passes through the mica tubes for induction heating; The straightened raw material moves forward in the mica tube at a uniform speed and first enters the medium frequency heating coil. The medium frequency heater starts after a certain delay to heat the raw material. The delay time of medium frequency start-up is determined by the running speed of the raw material and the distance from the head of the raw material to the first heating coil. The temperature out of the medium frequency heater is not less than 580℃. The raw materials heated by medium frequency enter the high frequency heating coil. The high frequency heater starts after a certain delay to continue heating the raw materials. The high frequency start delay time is determined by the running speed of the raw materials and the distance from the head of the raw materials to the outlet of the last high frequency heating coil. The temperature out of the medium frequency is not less than 880℃. The certain time delay is no more than 40s.

6. The titanium alloy wire rolling method according to claim 1, characterized in that: In step 5, a continuous rolling mill is used, which has 8 horizontal and vertical alternating twist-free rolling mills. The rolling accuracy of the rolling mill is improved by using a separate transmission. The speed of each machine can be adjusted separately, and the push-pull relationship between the frames is adjustable.

7. The titanium alloy wire rolling method according to claim 1, characterized in that: In step 6, a high-speed close-packed wire-taking machine is used, and the maximum wire-taking speed is no more than 10 m / s.

8. The titanium alloy wire rolling method according to claim 1, characterized in that: The method further comprises step 7, annealing and surface treatment, wherein the annealing temperature is between 600° C. and 800° C., and the surface treatment comprises one or more of polishing, anodizing, sandblasting and coating.

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