Automatic constant-temperature reciprocating rolling equipment and process for titanium alloy bar cogging mill

Abstract

The invention discloses automatic constant-temperature reciprocating rolling equipment and process for a titanium alloy bar cogging mill, and belongs to the technical field of steelmaking continuous casting and rolling. The equipment comprises two rotatable movable metal detector devices, a feeding induction heating system and a discharging induction heating system, wherein the two rotatable moving type metal detector devices are oppositely arranged on the left side and the right side of a roller respectively, the feeding induction heating system is arranged on the front side of the feeding conveying roller way, and the discharging induction heating system is arranged on the front side of the discharging conveying roller way. By means of the rotatable movable metal detector device, the detection precision is improved, the device adapts to the production rhythm of a cogging mill, the steel throwing position can be controlled to be close to a roller as far as possible, the rolling efficiency is improved, the titanium blank temperature loss in the rolling process is reduced, and meanwhile the manual operation risk is reduced. In addition, the situation that the temperature of the head and the tail of the blank is not uniform is improved through the induction heating system, and therefore the temperature is kept constant in the whole rolling process.

Description

Technical Field

[0001] This invention belongs to the field of steelmaking continuous casting and rolling technology, and relates to bar billet making equipment, specifically to an automatic constant temperature reciprocating rolling equipment and process for titanium alloy bar billet making machine. Background Technology

[0002] During traditional continuous rolling, high-temperature steel billets continuously lose heat and decrease in temperature. Furthermore, due to the elongation effect of rolling, the tail end of the billet has a longer heat dissipation time, resulting in a significant temperature difference between the beginning and end of the billet as it enters the mill. Excessive heat loss may cause the billet to fall below the required rolling temperature range, leading to substandard quality steel. Moreover, the temperature difference between the beginning and end of the billet during rolling necessitates varying rolling force according to temperature changes, increasing wear on the mill rolls and reducing their service life.

[0003] Traditional steel mills with large 1350mm billet mills often require a large amount of cooling water for the rolls, and some models are equipped with guide devices. Therefore, to achieve automatic rolling, the installation position of the hot metal detector must ensure both smooth automatic rolling and equipment safety and signal stability. Thus, the hot metal detector must be installed outside the mill stand, at a distance of no less than 1.5 meters from the centerline of the rolls.

[0004] Due to interference from moisture in the thermal inspection signal and limitations in guide length, fully automated rolling requires the billet to completely leave the exit side for thermal inspection before stopping the roller conveyor (pure time-delay control), and the roller conveyor stops with a deceleration ramp time. After the billet finally comes to a stop, its head is 2-3 meters away from the rolling line, requiring an additional 2-3 seconds of transport time for the next pass after flipping and feeding. Therefore, while manual rolling allows for more precise control of the stopping position, the labor intensity for workers is too high, and it is prone to human error in judging the timing of billet ejection, leading to other accidents. Summary of the Invention

[0005] In view of the defects and deficiencies of the existing technology, the purpose of this invention is to propose an automatic constant temperature reciprocating rolling equipment and process for titanium alloy bar billet making, which solves the technical problems of the existing technology that, although manual rolling can control the stop position more precisely, the labor intensity of workers is too high and it is easy to cause other accidents due to human misjudgment of the timing of steel throwing.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: An automatic constant temperature reciprocating rolling mill for titanium alloy bars includes two rotatable and movable metal detectors, a feeding induction heating system, and a discharging induction heating system. The two rotatable and movable metal detectors are respectively and opposite to each other on the left and right sides of the rolls. The feeding induction heating system is located in front of the feeding conveyor rollers, and the discharging induction heating system is located in front of the discharging conveyor rollers.

[0007] The rotatable and movable metal detector device includes a mounting base, on which a rotating shaft is mounted, extending upward in a vertical direction; a rotating rod is rotatably mounted inside the top end of the rotating shaft, extending upward in a vertical direction; a temperature sensor is fixedly mounted on the top end of the rotating rod; a telescopic rod is fixedly mounted on the top end of the rotating shaft, extending in a horizontal direction; a detector mounting rod is fixedly mounted on the inner end of the telescopic rod, extending upward in a vertical direction, and a hot metal detector is fixedly mounted on the top end of the detector mounting rod.

[0008] The telescopic rod includes an outer sleeve, a first telescopic sleeve, and a second telescopic sleeve in sequence. A first limiting post is fixedly installed inside the outer sleeve. A first piston is fixedly installed at one end of the first telescopic sleeve. Both the first piston and one end of the first telescopic sleeve can be movably installed inside the outer sleeve, with the first piston located outside the first limiting post. A second limiting post is fixedly installed inside the first telescopic sleeve. A second piston is fixedly installed at one end of the second telescopic sleeve. Both the second piston and one end of the second telescopic sleeve can be movably installed inside the first telescopic sleeve, with the second piston located outside the second limiting post.

[0009] The present invention also has the following technical features: Specifically, the feeding induction heating system and the discharging induction heating system have the same structure; the induction heating system includes an induction heating furnace, a power supply cabinet, and a control cabinet.

[0010] Specifically, the outer sleeve, the first telescopic sleeve, and the second telescopic sleeve are all stainless steel pipes.

[0011] Specifically, the rotating shaft adopts a hollow structure with a bottom-sealed limit.

[0012] Specifically, the equipment also includes a rolling mill frame, with the rolls installed inside the rolling mill frame.

[0013] This invention also protects an automatic constant-temperature reciprocating rolling process for titanium alloy bar billets, which is implemented using the equipment described above.

[0014] Specifically, the method includes the following steps: Step 1: Steel billet preparation and initial heating.

[0015] Step 2, pre-rolling descaling: The heated steel billet is removed from the holding furnace and first descaled by high-pressure water; after descaling, the steel billet enters the feeding conveyor roller table.

[0016] Step 3, Temperature control and rolling before the first rolling pass: Step 3.1, Temperature Detection and Feedback: The temperature sensor located at the mill inlet side detects the current temperature of the billet in real time and feeds the data back to the control system.

[0017] Step 3.2, Dynamic Heating: The control system automatically calculates and adjusts the output power of the feed induction heating system based on the difference between the feedback temperature and the preset first-pass rolling temperature, so as to accurately heat the billet and ensure that its temperature reaches the required range when it enters the rolling mill.

[0018] Step 3.3, Perform rolling: The steel billet that has completed temperature control is immediately subjected to the first rolling pass.

[0019] Step 4, pre-rolling temperature control and rolling for the second pass: Step 4.1, Detection and Reversal of Rolled Item Position: After the first rolling pass is completed, the head of the rolled item is detected by the hot metal detector on the exit side. The control system then commands the conveyor rollers to reverse and send the billet back in the opposite direction.

[0020] Step 4.2, Temperature Detection and Feedback: During the reverse movement of the billet, the temperature sensor located on the other side of the rolling mill detects its temperature and feeds it back to the control system.

[0021] Step 4.3, Dynamic Heating: The control system automatically adjusts the output power of the discharge induction heating system based on the feedback temperature and the preset second-pass rolling temperature to reheat the billet and ensure that it enters the second-pass rolling process in a uniform temperature state.

[0022] Step 4.4, Rolling: The temperature-controlled steel billet undergoes a second rolling pass.

[0023] Step 5: For the third to fifth passes, alternating temperature control and rolling are performed. The control system follows the same logic as in Step 4, controlling the feeding induction heating system and the discharging induction heating system to alternately activate, and automatically executing the following closed-loop process before each rolling pass: Step 5.1: The hot metal detector confirms the completion of the previous pass and triggers the billet reversal.

[0024] Step 5.2: After the reversal, the temperature sensor on the side about to enter the rolling mill will detect the billet temperature.

[0025] Step 5.3: The control system calculates and adjusts the output power of the corresponding induction heating system in real time according to the process temperature requirements of the third, fourth and fifth passes, and performs online temperature compensation for the steel billet.

[0026] Step 5.4: The billet is rolled in this pass immediately after reaching the target temperature range.

[0027] Step 6, Post-rolling cooling and collection: The steel plate after final rolling enters the laminar flow cooling system and is cooled to the coiling temperature or the fixed length temperature. Then it is coiled or cut to obtain the finished steel product.

[0028] Specifically, in step one, the steel billet is a continuously cast bar with a cross-sectional diameter of 100mm, and the steel grade is Ti6Al4V.

[0029] Specifically, in step one, the initial heating temperature is 910℃~950℃, and the total heating time is 1.5~2h.

[0030] Specifically, in step two, the water pressure of the high-pressure water is 40-60 MPa.

[0031] Specifically, in step 3.2, the preset temperature for the first rolling pass is 890℃~910℃.

[0032] Specifically, in step 3.3, the reduction in the first rolling pass is 30mm.

[0033] Specifically, in step 4.3, the preset temperature for the second rolling pass is 890℃~870℃.

[0034] Specifically, in step 4.4, the reduction in the second rolling pass is 20mm.

[0035] Specifically, in step 5.3, the preset temperatures for the third, fourth, and fifth rolling passes are 870℃~850℃, 850℃~830℃, and 830℃~810℃, respectively.

[0036] Specifically, in step 5.4, the reduction amounts for the third, fourth, and fifth rolling passes are 10mm, 8mm, and 7mm, respectively. After the fifth rolling pass, a final product with a thickness of 25mm is obtained, and the final rolling temperature is precisely controlled between 815℃ and 800℃.

[0037] Specifically, in step six, the cooling rate is 25℃ / s; the fixed-length temperature is below 600℃.

[0038] Compared with the prior art, the present invention has the following beneficial technical effects: (I) This invention designs a rotatable and movable metal detector device. During guideless and water-cooled rolling, the hot metal detectors at the mill inlet and outlet can be moved as needed to a position 20-30 cm to either side of the roll centerline, enabling precise detection of steel biting and ejection points on titanium alloy billets. This design not only improves detection accuracy and adapts to the production rhythm of the billet mill, but also controls the ejection position to be as close to the roll as possible. The rolling time for a single titanium billet is reduced from 18 minutes to 13 minutes, improving rolling efficiency, reducing temperature loss of the titanium billet during rolling, and minimizing the risks associated with manual operation.

[0039] (II) This invention utilizes an induction heating system consisting of multiple independently controllable longitudinal magnetic induction furnaces installed at both the inlet and outlet of the rolling mill. This system compensates for temperature losses in the titanium alloy billet during the reciprocating rolling process and improves the uneven temperature distribution at the beginning and end of the billet, thereby maintaining a constant temperature throughout the rolling process. Constant-temperature rolling helps ensure the uniformity of the microstructure and dimensions of the titanium alloy, reduces the required rolling force, extends the service life of the rolls, reduces maintenance frequency, and ultimately increases production capacity. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the overall structure of the automatic constant temperature reciprocating rolling device for titanium alloy bar billet making machine.

[0041] Figure 2 This is a schematic diagram of a rotatable and movable metal detector device.

[0042] Figure 3 This is a schematic diagram of the retractable rod.

[0043] Figure 4 This is a schematic diagram of the power distribution for an induction heating system.

[0044] The meanings of the labels in the diagram are as follows: 1-feed conveyor roller, 2-roll, 3-discharge conveyor roller, 4-rotatable and movable metal detector device, 5-feed induction heating system, 6-discharge induction heating system, 7-rolling mill outer frame, 8-steel billet.

[0045] 401-Mounting base, 402-Rotating shaft, 403-Rotating rod, 404-Temperature sensor, 405-Telescopic rod, 406-Detector mounting rod, 407-Hot metal detector.

[0046] 40501 - Outer sleeve, 40502 - First telescopic sleeve, 40503 - Second telescopic sleeve, 40504 - First limiting post, 40505 - First piston, 40506 - Second limiting post, 40507 - Second piston.

[0047] The technical solution of the present invention will be further described below with reference to the embodiments. Detailed Implementation

[0048] It should be noted that, unless otherwise specified, all components used in this invention are conventional components known in the prior art.

[0049] Following the above technical solutions, specific embodiments of the present invention are given below. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent modifications made based on the technical solutions of this application fall within the protection scope of the present invention.

[0050] Example 1: This embodiment provides an automatic constant temperature reciprocating rolling equipment for titanium alloy bar billet making, including two rotatable and movable metal detector devices (4), a feeding induction heating system (5) and a discharging induction heating system (6); wherein, the two rotatable and movable metal detector devices (4) are respectively and oppositely arranged on the left and right sides of the roll (2), the feeding induction heating system (5) is arranged on the front side of the feeding conveyor roller (1), and the discharging induction heating system (6) is arranged on the front side of the discharging conveyor roller (3).

[0051] As a specific embodiment, the rotatable movable metal detector device (4) includes a mounting base (401), on which a rotating shaft (402) is mounted, the rotating shaft (402) extending upward in the vertical direction; a rotating rod (403) is rotatably mounted inside the top end of the rotating shaft (402), the rotating rod (403) extending upward in the vertical direction; a temperature sensor (404) is fixedly mounted on the top end of the rotating rod (403); a telescopic rod (405) is fixedly provided on the top end of the rotating shaft (402), the telescopic rod (405) being arranged in the horizontal direction; a detector mounting rod (406) is fixedly provided at the inner end of the telescopic rod (405), the detector mounting rod (406) extending upward in the vertical direction, and a hot metal detector (407) is fixedly mounted on the top end of the detector mounting rod (406).

[0052] As a specific embodiment of this invention, the device also includes a mill frame (7), and the rolls (2) are installed inside the mill frame (7).

[0053] As a specific embodiment, the telescopic rod (405) includes an outer sleeve (40501), a first telescopic sleeve (40502), and a second telescopic sleeve (40503) in sequence. A first limiting post (40504) is fixedly installed inside the outer sleeve (40501), and a first piston (40505) is fixedly provided at one end of the first telescopic sleeve (40502). One end of both the first piston (40505) and the first telescopic sleeve (40502) can be movably disposed inside the outer sleeve (40501). The first piston (40505) is located outside the first limiting post (40504); the second limiting post (40506) is fixedly installed inside the first telescopic sleeve (40502); the second piston (40507) is fixedly installed at one end of the second telescopic sleeve (40503); the second piston (40507) and one end of the second telescopic sleeve (40503) can be movably installed inside the first telescopic sleeve (40502); the second piston (40507) is located outside the second limiting post (40506).

[0054] As a specific embodiment, the feeding induction heating system (5) and the discharging induction heating system (6) have the same structure; the induction heating system includes an induction heating furnace, a power supply cabinet, and a control cabinet. The induction heating furnace adopts longitudinal magnetic induction heating, and the built-in coil generates an alternating magnetic field to induce current in the steel billet, thereby achieving heating. The power supply cabinet provides power output to the induction heating furnace, including voltage, current, frequency, etc. The control cabinet has a built-in big data control model, which can automatically control the voltage and current output by the power supply cabinet according to the required rolling temperature, rolling pass, steel billet shape and composition, so as to ensure that the output power of the induction heating furnace can meet the process requirements.

[0055] In this embodiment, the mounting base (401) is the fixed force-bearing part of the rotatable and movable metal detector device (4). The rotating shaft (402) is made of hollow stainless steel tube, and a certain amount of movement space is set by limiting screws. The rotating rod (403) of the telescopic rod part is sleeved in the rotating shaft (402) to realize the rotation function of the rotatable and movable metal detector device (4).

[0056] In this embodiment, the outer sleeve (40501), the first telescopic sleeve (40502), and the second telescopic sleeve (40503) are all stainless steel tubes. The first telescopic sleeve (40502), the first limiting post (40504), and the first piston (40505) cooperate to form a first-stage telescopic structure. The stainless steel tubes have a hollow structure. The first piston (40505) cooperates with the first telescopic sleeve (40502) to realize the telescopic function. The first limiting post (40504) restricts the movement position of the first piston (40505). Similarly, a second-stage contraction can be formed, with the outer diameter of adjacent stainless steel tubes gradually decreasing from left to right to realize the contraction function. The two-stage telescopic structure ensures the length of the telescopic displacement distance and can automatically adjust the distance between the hot metal detector (407) and the center of the roll, flexibly controlling the stop position of the steel throwing.

[0057] In this embodiment, the rotating shaft (402) is hollow with a bottom-sealed limit structure. The rotating rod (403) is fitted into the rotating shaft (402) to realize the rotation function of the system. The rotation function of the rotating shaft (402) facilitates the inspection and maintenance of the rolls and ensures the accurate positioning of the hot metal detector (407) when it is online.

[0058] In this embodiment, the titanium alloy bar billet rolling mill is a symmetrical structure on both sides of the constant temperature reciprocating rolling equipment, and is placed on both sides of the rolling mill to effectively detect the temperature and position of the reciprocating titanium billet, and transmit the detection data to the induction heater.

[0059] In this embodiment, the temperature sensor (404) is placed outside the mill frame (7) to monitor the temperature of the titanium alloy billet and transmit the temperature data to the feeding induction heating system (5) and the discharging induction heating system (6).

[0060] In this embodiment, the feeding induction heating system (5) and the discharging induction heating system (6) are equipped with a control system. The induction heating system is turned on alternately when the billet reciprocates into the rolling mill, and the output power of the induction heating system is automatically adjusted according to the actual rolling situation and requirements to ensure that the billet is kept at a constant temperature throughout the rolling process and the temperature is kept within the process requirements range.

[0061] Example 2: This embodiment presents an automatic isothermal reciprocating rolling process for titanium alloy bars, implemented using the equipment described in Embodiment 1. Taking the rolling of a 100mm diameter bar into a 25mm thick slab as an example, the specific steps of this method are as follows: Step 1, Billet Preparation and Initial Heating: The billet is a continuous cast billet with a cross-sectional diameter of 100 mm, and the steel grade is Ti6Al4V. The billet is sent to a holding furnace for homogenization, and the holding furnace temperature is 910℃~950℃, with a total heating time of 1.5~2h.

[0062] Step 2, Descaling before rolling: The heated steel billet is removed from the holding furnace and first descaled by high-pressure water at a pressure of 40 MPa. After descaling, the steel billet (8) enters the feeding conveyor roller conveyor (1).

[0063] Step 3, Temperature control and rolling before the first rolling pass: Step 3.1, Temperature detection and feedback: The temperature sensor (404) located on the mill inlet side detects the current temperature of the billet (8) in real time and feeds the data back to the control system.

[0064] Step 3.2, Dynamic heating: The control system automatically calculates and adjusts the output power of the feed induction heating system (5) based on the difference between the feedback temperature and the preset first-pass rolling temperature (890℃~910℃) to accurately heat the billet so that its temperature reaches the process requirements range uniformly when it enters the rolling mill.

[0065] Step 3.3, Perform rolling: The steel billet that has completed temperature control is immediately subjected to the first rolling pass. The reduction in this pass is 30mm, and the rolled billet is approximately elliptical with a thickness of 70mm.

[0066] Step 4, pre-rolling temperature control and rolling for the second pass: Step 4.1, Detection and Reversal of Rolled Item Position: After the first rolling pass is completed, the head of the rolled item is detected by the hot metal detector (407) on the exit side. The control system then commands the conveyor rollers to reverse and send the billet back in the opposite direction.

[0067] Step 4.2, Temperature detection and feedback: During the reverse movement of the billet, the temperature sensor (404) located on the other side of the mill (i.e. the original exit side, now used as the second entry side) detects its temperature and feeds it back to the control system.

[0068] Step 4.3, Dynamic heating: The control system automatically adjusts the output power of the discharge induction heating system (6) based on the feedback temperature and the preset second-pass rolling temperature (890℃~870℃) to reheat the billet and ensure that it enters the second-pass rolling in a uniform temperature state.

[0069] Step 4.4, Rolling: The temperature-controlled steel billet undergoes a second rolling pass with a reduction of 20mm, resulting in a 50mm thick rectangle.

[0070] Step 5, alternating temperature control and rolling for the third to fifth passes (the control system follows the same logic as in step 4, controlling the feeding induction heating system (5) and the discharging induction heating system (6) to alternately turn on, and automatically executing the following closed-loop process before each rolling pass): Step 5.1: The hot metal detector confirms the completion of the previous pass and triggers the billet reversal.

[0071] Step 5.2: After the reversal, the temperature sensor on the side about to enter the rolling mill will detect the billet temperature.

[0072] Step 5.3: The control system calculates and adjusts the output power of the corresponding induction heating system in real time according to the process temperature requirements of the third, fourth and fifth passes (870℃~850℃, 850℃~830℃ and 830℃~810℃, respectively) to perform online temperature compensation for the steel billet.

[0073] Step 5.4: The billet is rolled immediately after reaching the target temperature range. The reduction for each pass is 10mm, 8mm, and 7mm, respectively. After the fifth pass, a final product with a thickness of 25mm is obtained, and the final rolling temperature is precisely controlled between 815℃ and 800℃.

[0074] Step 6, Post-rolling cooling and collection: The rolled steel sheet enters the laminar flow cooling system and is cooled to the coiling temperature or the fixed-length temperature (below 600℃) at a cooling rate of 25℃ / s. Then it is coiled or cut to obtain the finished steel product.

[0075] In addition, the present invention adds a function to set the steel throwing position correction parameter for each pass in the control system, which can flexibly control the position of the steel throwing stop line during rolling. That is, the steel throwing distance can be set according to the needs of different passes, and the rolling rhythm can be flexibly adjusted: ① A few passes (requiring a suitable steel turning position): appropriately lengthen the delay to stop the billet in the area with dense steel turning hooks, which is convenient for steel turning; ② Most passes (requiring rapid reciprocating rolling): reduce the delay or set it to 0 delay to control the steel throwing position as close as possible to the roll.

Claims

1. A constant temperature automatic reciprocating rolling apparatus for titanium alloy bar breakdown mill, characterized in that, It comprises two rotatable mobile metal detector devices (4), an infeed induction heating system (5) and an outfeed induction heating system (6); wherein the two rotatable mobile metal detector devices (4) are respectively and oppositely arranged on the left and right sides of the roller (2), the infeed induction heating system (5) is arranged on the front side of the infeed conveying roller (1), and the outfeed induction heating system (6) is arranged on the front side of the outfeed conveying roller (3).

2. The automatic constant temperature reciprocating rolling apparatus for titanium alloy bar cogging mill according to claim 1, wherein The rotatable mobile metal detector device (4) comprises a mounting seat (401), a rotating shaft (402) is mounted on the mounting seat (401) and extends upward along the vertical direction, a rotating rod (403) is rotatably mounted in the top end of the rotating shaft (402) and extends upward along the vertical direction, a temperature sensor (404) is fixedly installed on the top end of the rotating rod (403), a telescopic rod (405) is fixedly arranged on the top end of the rotating shaft (402) and extends along the horizontal direction, a detector mounting rod (406) is fixedly arranged in the inner end of the telescopic rod (405) and extends upward along the vertical direction, and a hot metal detector (407) is fixedly installed on the top end of the detector mounting rod (406).

3. The automatic constant temperature reciprocating rolling mill apparatus for titanium alloy bar cogging as recited in claim 1, wherein, It also comprises a rolling mill outer frame (7), and the roller (2) is installed in the rolling mill outer frame (7).

4. The automatic constant temperature reciprocating rolling apparatus for titanium alloy bar cogging mill according to claim 2, wherein The telescopic rod (405) comprises an outer sleeve (40501), a first telescopic sleeve (40502) and a second telescopic sleeve (40503) in sequence, a first limiting column (40504) is fixedly installed in the outer sleeve (40501), a first piston (40505) is fixedly arranged at one end of the first telescopic sleeve (40502), the first piston (40505) and the one end of the first telescopic sleeve (40502) are movably arranged in the outer sleeve (40501), and the first piston (40505) is located outside the first limiting column (40504), a second limiting column (40506) is fixedly installed in the first telescopic sleeve (40502), a second piston (40507) is fixedly arranged at one end of the second telescopic sleeve (40503), the second piston (40507) and the one end of the second telescopic sleeve (40503) are movably arranged in the first telescopic sleeve (40502), and the second piston (40507) is located outside the second limiting column (40506).

5. The automatic constant temperature reciprocating rolling mill apparatus for titanium alloy bar cogging as recited in claim 1, wherein, The infeed induction heating system (5) and the outfeed induction heating system (6) are completely same in structure; the induction heating system comprises an induction heating furnace, a power cabinet and a control cabinet.

6. The automatic constant temperature reciprocating rolling apparatus for titanium alloy bar cogging mill according to claim 4, wherein The outer sleeve (40501), the first telescopic sleeve (40502) and the second telescopic sleeve (40503) are all stainless steel pipes.

7. The automatic constant temperature reciprocating rolling mill apparatus for titanium alloy bar cogging as recited in claim 2, wherein The rotating shaft (402) is hollow and the bottom is sealed and limited.

8. A process for automatic constant temperature reciprocating rolling of titanium alloy bar in a breakdown mill, characterized in that, The process is realized by using the equipment according to any one of claims 1 to 7.

9. The automatic constant temperature reciprocating rolling process for titanium alloy bar cogging mill as claimed in claim 8, wherein, The method comprises the following steps: Step one, billet preparation and initial heating; Step two, descaling before rolling: The heated billet is moved out of the holding furnace, first descaled by high-pressure water; after descaling, the billet (8) enters the feeding roller bed (1); Step three, first pass pre-rolling temperature control and rolling: Step 3.1, temperature detection and feedback: the temperature sensor (404) located at the entrance side of the rolling mill detects the current temperature of the billet (8) in real time and feeds back the data to the control system; Step 3.2, dynamic heating: the control system automatically calculates and adjusts the output power of the feeding induction heating system (5) according to the difference between the feedback temperature and the preset first pass required rolling temperature, and accurately heats the billet, so that its temperature reaches the process requirement range uniformly when entering the rolling mill; Step 3.3, execute rolling: the billet that has completed temperature control is immediately rolled in the first pass; Step four, second pass pre-rolling temperature control and rolling: Step 4.1, rolling piece position detection and reversing: after the first pass rolling is completed, the head of the rolling piece is detected by the hot metal detector (407) at the exit side, and the control system immediately instructs the conveying roller to reverse, returning the billet in reverse; Step 4.2, temperature detection and feedback: during the reverse movement of the billet, the temperature sensor (404) located on the other side of the rolling mill detects its temperature and feeds it back to the control system; Step 4.3, dynamic heating: the control system automatically adjusts the output power of the discharging induction heating system (6) according to the feedback temperature and the preset second pass required rolling temperature, and heats the billet to ensure that it enters the second pass rolling in a uniform temperature state; Step 4.4, execute rolling: the billet that has completed temperature control is rolled in the second pass; Step five, third to fifth pass alternating temperature control and rolling, the control system follows the same logic as step four, controls the feeding induction heating system (5) and the discharging induction heating system (6) to open alternately, and automatically executes the following closed-loop process before each pass rolling: Step 5.1, the hot metal detector confirms the completion of the last pass and triggers the billet reversing; Step 5.2, after reversing, the temperature sensor about to enter the side of the rolling mill detects the temperature of the billet; Step 5.3, the control system calculates and adjusts the output power of the corresponding induction heating system in real time according to the process requirement temperature of the third, fourth and fifth passes, and compensates the temperature of the billet online; Step 5.4, the billet is immediately rolled in the pass after reaching the target temperature range.

10. The automatic constant temperature reciprocating rolling process for titanium alloy bar cogging mill as claimed in claim 9, wherein, It also includes step six, post-rolling cooling and collection: the steel plate after finish rolling is cooled to coiling temperature or sizing temperature, and then coiled or cut to obtain finished steel products.

Images