Rolling equipment and process for reducing surface cracking of titanium alloy bars

Abstract

The present application relates to titanium alloy bar production technical field, specifically to a kind of rolling equipment and process for reducing titanium alloy bar surface cracking, including base, still including controller, trolley type resistance furnace, induction heating furnace, fast forging machine, rolling mechanism and coating mechanism, fast forging machine includes rack, hammering component and adjusting component, coating mechanism includes first clamping plate, second clamping plate, driving component and smearing component, rolling mechanism is located at the top of base, and rolling mechanism includes three two-roll reversible breakdown rolling mill, hammering component, adjusting component, driving component and smearing component are electrically connected with controller, a kind of rolling equipment for reducing titanium alloy bar surface cracking of the present application, adopts the production mode of forging-rolling combination, can make full use of the flexibility of forging and controllability of rolling, and realize the complementary advantages of both, while substantially improving production efficiency, improve the uniformity, consistency and batch stability of bar.

Description

Technical Field

[0001] This invention relates to the field of titanium alloy bar production technology, specifically to a rolling equipment and process for reducing surface cracking of titanium alloy bars. Background Technology

[0002] Titanium alloy rods are slender parts made of titanium alloy, which can be further processed for use in construction engineering, interior decoration, and so on. Their advantages include light weight, high strength, and beautiful appearance, making them widely used in modern construction.

[0003] Titanium alloy bars are generally produced by free forging, and finally formed into bars with specifications of Φ50-Φ100 using a transverse rolling mill. However, due to the inherent characteristics of the equipment, free forging has low production efficiency, is greatly affected by human factors, and makes it difficult to guarantee the uniformity, consistency and batch stability of the bars.

[0004] Given the shortcomings of existing technologies, there is a need to design a rolling equipment and process that can significantly improve production efficiency while enhancing the uniformity, consistency, and batch stability of the bars and reducing surface cracking of titanium alloy bars. Summary of the Invention

[0005] The purpose of this invention is to provide a rolling equipment and process for reducing surface cracking of titanium alloy bars, thereby solving the problems of poor uniformity, poor consistency and batch instability caused by the existing free forging of titanium alloy bars.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A rolling apparatus for reducing surface cracking of titanium alloy bars is provided, including a base.

[0008] It also includes controllers, bogie-type resistance furnaces, induction heating furnaces, high-speed forging mills, rolling mechanisms, and coating mechanisms.

[0009] Both the trolley-type resistance furnace and the induction heating furnace are located on top of the base.

[0010] The high-speed forging mill is located on top of the base. It includes a frame, a hammering assembly, and an adjusting assembly. The frame is positioned on top of the base, the hammering assembly is located between the base and the frame, and the adjusting assembly is located on top of the base.

[0011] The coating mechanism is located on top of the base. The coating mechanism includes a first clamping plate, a second clamping plate, a drive assembly, and an application assembly. The first clamping plate is rotatably mounted on top of the base via a first rotating shaft. The drive assembly is also located on top of the base. A support column is fixedly mounted on top of the base. The second clamping plate is rotatably mounted on top of the support column. The application assembly is located on the outer wall of the support column.

[0012] The rolling mechanism is located on the top of the base. The rolling mechanism includes three two-roll reversible billet mills. All three two-roll reversible billet mills are located on the top of the base. The hammering assembly, adjusting assembly, driving assembly, and coating assembly are electrically connected to the controller.

[0013] Furthermore, the hammering assembly includes a first hydraulic rod, a pressure block, and a support block. The support block is located on the top of the base, the first hydraulic rod is inserted into the frame, the pressure block is fixed on its output end, and the first hydraulic rod is electrically connected to the controller.

[0014] Furthermore, one end of the trolley-type resistance furnace is equipped with a furnace door that slides along two guide rails. A crossbar is fixedly installed on the top of the two guide rails, and a first long-shaft cylinder is inserted into the crossbar. Its output end is fixedly connected to the top of the furnace door. The top of the base is equipped with a track, and the trolley is mounted on the track by four rollers. The first long-shaft cylinder is electrically connected to the controller.

[0015] Furthermore, the adjustment assembly includes a second long-shaft cylinder, a mounting housing, a first motor, a first gear, a second gear, and a gripper cylinder. A base is fixedly mounted on the top of the base, and two slide rails are fixedly mounted on the top of the base. The mounting housing is slidably mounted on the top of the two slide rails. The second long-shaft cylinder is inserted into the top of the base, and its output end is fixedly connected to one end of the mounting housing. A vertical plate is fixedly mounted inside the mounting housing. The first motor is inserted into the vertical plate, and the first gear is fixedly mounted on its output end. The second gear is rotatably mounted on the vertical plate via a second rotating shaft. The first gear and the second gear are meshed and connected, and the first gear is smaller than the second gear. The second rotating shaft is rotatably connected to the other end of the mounting housing. The gripper cylinder is fixedly mounted on the end of the rotating shaft near the second gear. The second long-shaft cylinder is electrically connected to the controller.

[0016] Furthermore, each two-roll reversible billet mill includes a conveyor table, a second motor, a synchronous belt, two rolls, two third gears, and two synchronous pulleys. Six support plates are fixedly installed on the top of the base. The conveyor table is located on the top of the base, and several rollers are rotatably mounted on the conveyor table. The two rolls are rotatably mounted between two of the support plates via hinge shafts. Each third gear is fixedly mounted on a hinge shaft, and the two third gears are meshed together. The second motor is fixedly mounted on one of the support plates. The two synchronous pulleys are respectively fixed at their output ends and on one of the hinge shafts near the second motor. The synchronous belt is sleeved between the two synchronous pulleys. The second motor is electrically connected to the controller.

[0017] Furthermore, each conveyor table has two upright plates fixed at both ends, a second hydraulic rod fixed at the top of each upright plate, a pressure plate fixed at the output end of each second hydraulic rod, two guide rods fixed on the outer wall of each pressure plate, each guide rod being inserted into the upright plate, and each second hydraulic rod being electrically connected to the controller.

[0018] Furthermore, the drive assembly includes a third motor, a drive wheel, a driven wheel, and a belt. The third motor is fixedly mounted on the top of the base, the drive wheel is fixedly mounted on its output end, the driven wheel is fixedly mounted on the first rotating shaft, and the belt is sleeved between the drive wheel and the driven wheel. The top of the support column is rotatably mounted on the third rotating shaft, and the bottom end of the third rotating shaft is fixedly mounted on the mounting plate. The first cylinder is fixedly mounted on the mounting plate, and its output end is fixedly connected to the second clamping plate. Both the third motor and the first cylinder are electrically connected to the controller.

[0019] Furthermore, the coating assembly includes a second cylinder, a mounting bracket, and a roller brush. The second cylinder is inserted into a support column, the mounting bracket is fixed to the output end of the second cylinder, the roller brush is rotatably mounted on the mounting bracket, and the second cylinder is electrically connected to a controller.

[0020] Furthermore, the top of the base is provided with a first conveyor belt and a second conveyor belt, and the top of both the first conveyor belt and the second conveyor belt is fixedly provided with a material rack.

[0021] A rolling process for reducing surface cracking of titanium alloy bars includes the following steps:

[0022] S1: Single-fire forging of ingots:

[0023] The titanium alloy ingot is placed on the top of the trolley and pushed into the trolley-type resistance furnace. Then, the first long-shaft cylinder is started by the controller, so that its output end extends downward. Since the furnace door is slidably connected to the two guide rails, the top of the furnace door is fixedly connected to the output end of the first long-shaft cylinder, thereby driving the furnace door to descend and closing the open end of the trolley-type resistance furnace. Then, the trolley-type resistance furnace is started to heat the ingot. First, it is heated to 800 (±10)℃ and held for 120 (±10) min. Then, it is heated with the furnace to 100℃-200℃ above the phase transformation point. The ingot holding time is D (ingot diameter) × 0.7 (0, +60) min.

[0024] After the ingot is heated and held at the specified temperature for a specified time, the controller causes the output end of the first long-shaft cylinder to retract, thereby driving the furnace door to rise and push out the trolley and the ingot on it. Then the ingot is placed on top of the support block, and the controller starts the first hydraulic rod, causing its output end to extend downward. Since the pressure block is fixedly connected to its output end, it drives the pressure block to hammer the ingot, that is, to forge a high-temperature billet. With the support block, the ingot is forged into a square billet after 80%-90% total deformation. After air cooling, it is polished, inspected, and then transferred to rolling for hot processing.

[0025] Since the initial ingot is not square, after the ingot is heated in the trolley-type resistance furnace, it is placed between the pressure block and the support block. The end of the ingot closest to the mounting shell is clamped by the gripper cylinder. First, the pressure block descends to hammer the ingot, transforming it into a square billet. Then, the controller starts the second long-shaft cylinder, which drives the mounting shell, the gripper cylinder on it, and the clamped ingot to slide away from the frame, so that the entire surface of the ingot is hammered. After one end of the ingot is hammered flat, the controller starts the first motor, which drives the first gear to rotate. Since the second gear is fixedly connected to the second rotating shaft, and the second rotating shaft is fixedly connected to the gripper cylinder, the first gear and the second gear mesh with each other, and the first gear is smaller than the second gear. Then, the gripper cylinder drives the ingot to rotate, hammering the other surfaces of the ingot until the ingot is hammered into a square billet.

[0026] S2: Coating for titanium alloy billets before furnace rolling:

[0027] Before the billet is put into the furnace after the ingot is made into a square billet, the billet is placed horizontally in the flat groove set at the top of the material rack on the first conveyor belt. Then the billet is transported to the support position by the first conveyor belt. Then the power is cut off to the first conveyor belt, and the billet is placed vertically on the top of the first clamping plate. Then the controller starts the first cylinder, so that its output end extends downward and drives the second clamping plate to descend and press the top of the billet, thereby cooperating with the first clamping plate to clamp and fix the billet.

[0028] Once the billet is fixed, the second cylinder is activated by the controller, causing its output end to extend towards the end closest to the billet. Since its output end is fixedly connected to the mounting frame, and the roller brush is rotatably connected to the mounting frame, it rotates to apply high-temperature resistant coating to the outer wall of the billet. The design of the second cylinder to drive the roller brush to extend and retract facilitates the application of high-temperature coating to all surfaces of the billet. It should be noted that the coating drying time is not less than 8 hours. After drying, the billet is sent to a trolley-type resistance furnace and heated to the phase change point of 960℃, and held for 200-250 minutes.

[0029] S3: First-pass, second-pass, and third-pass rolling of titanium alloy square billets:

[0030] The three two-roll reversible billet mills have the same structure, except that the diameter of the rolls on each mill is different. The roll diameters of the three mills are 1350mm, 850mm, and 600mm, respectively. After being coated with high-temperature paint and heated, the billet needs to be rolled by these three rolls. The rolling process is as follows: when the billet is placed on top of several rollers on the conveyor table, the rollers drive the billet to be conveyed between the two rolls. At the same time, the controller starts the second motor, causing its output end to rotate counterclockwise. Since the two synchronous pulleys are fixedly connected to their output ends and one of the hinge shafts near the second motor, and each third gear is fixedly connected to a hinge shaft, the two third gears mesh with each other. The two rolls are rotatably set on two support plates through the hinge shafts, thereby driving the two rolls to rotate from the outside to the inside, rolling the billet conveyed between them.

[0031] As the billet passes through two rolls and is conveyed to a position near the two pressure plates, a controller activates two second hydraulic rods. This causes the output ends of both second hydraulic rods to move closer to the end of the titanium alloy billet, thus extruding the billet and shaping it into a bar. It should be noted that the first rolling process involves rolling the billet through two 1350mm rolls, achieving a 53% deformation, to a size of 180*220*L. The total deformation is 53%, the rolling speed is 1-3 mps, and air cooling is used. After sawing, peeling, grinding, and inspection, the billet is ready for the second rolling process. The second rolling process involves first heating in a bogie-type resistance furnace to 960℃ and holding for 130-200 minutes, then rolling it through two 850mm rolls. The billet with 52% deformation is rolled into Φ156mm*L, with 5-7 rolling passes, a total deformation of 52%, and a rolling speed of 1mps-3mps. Cooling method: online straightening with residual heat, straightness ≤5mm / m, no dead bends, air cooling. After sawing, peeling, grinding, and inspection, it is ready for three-stage rolling. Three-stage rolling requires first heating in an induction heating furnace to a temperature of 950℃, and then passing through a Φ600mm two-roll reversible billet mill + KOCKS continuous rolling mill to roll the billet with 57%-90% deformation into Φ50mm-Φ100mm. Cooling method: air cooling. It should be noted that the KOCKS continuous rolling mill is not shown in the figure. The bar is rolled in multiple stages with small deformation, and finally, titanium alloy bars with uniform structure and stable performance are obtained.

[0032] The beneficial effects of this invention are:

[0033] 1. This invention designs a controller, a trolley-type resistance furnace, an induction heating furnace, a high-speed forging mill, and a rolling mechanism. Through the cooperation of these five components, titanium alloy ingots are first forged in one heat, and then the forged titanium alloy billets are rolled in one, two, and three heats. This forging-rolling combined production method can fully utilize the flexibility of forging and the controllability of rolling, and achieve the complementary advantages of the two. This significantly improves production efficiency while enhancing the uniformity, consistency, and batch stability of the bars.

[0034] 2. By designing a coating mechanism, this invention can apply a high-temperature resistant coating to the forged titanium alloy billet before rolling, preventing excessive oxidation during furnace heating before rolling and thus increasing the amount of surface peeling. At the same time, it can improve the high-temperature resistance of the billet and improve the subsequent rolling effect.

[0035] 3. This invention, through the design of an induction heating furnace, achieves the following effects:

[0036] a. The heating time is short, and it produces very little oxide layer on the already polished or peeled billet, which is only about 1-5% of that of a conventional air medium heating furnace. This basically eliminates defects caused by oxide inclusions in the subsequent rolling process.

[0037] b. For some materials that easily absorb gases such as oxygen and hydrogen (e.g., titanium alloys and other high-temperature alloys), extremely short heating times can avoid atmospheric pollution generated during heating;

[0038] c. For billets with good original high-magnification structure after rolling or forging, rapid heating can prevent the deterioration and growth of the original structure caused by long-term heating above the recrystallization zone, which is extremely beneficial to the improvement of the structure of subsequent rolling or forging, and is suitable for long-term multi-batch stable production.

[0039] d. Induction heating and induction reheating, when used in conjunction with reversible billet mills and continuous rolling lines, can approach the ideal production mode of "isothermal rolling" to the greatest extent possible, which helps large-tonnage products achieve a high degree of consistency in internal microstructure and mechanical properties in the head, middle, and tail sections of the billet.

[0040] e. Short heating time and high thermal efficiency, suitable for flexible production of special materials in small batches and multiple batches.

[0041] 4. By designing the first and second conveyor belts, this invention facilitates the sequential transport of titanium alloy workpieces through the induction heating furnace, high-speed forging machine, rolling mechanism, and coating mechanism, thereby improving the transfer efficiency and reducing the processing time of titanium alloy bars, thus improving processing efficiency. It should be noted that the top of the material rack is respectively provided with a flat groove and an arc groove, which facilitates the placement of titanium alloy billets and titanium alloy bars, and improves the flexibility of conveying.

[0042] 5. The rolling equipment process designed in this invention reduces surface cracking of titanium alloy bars. The bars are rolled in multiple passes with small deformation, which can effectively reduce surface crack defects of finished bars, increase the yield by 2-3%, and obtain bars with uniform structure and stable performance.

[0043] 6. By designing adjustment components, namely a second long-shaft cylinder, a mounting shell, a first motor, a first gear, a second gear, and a gripper cylinder, this invention can drive the titanium alloy ingot to rotate and move between the support block and the pressure block, thereby facilitating the pressure block to quickly hammer any surface of it, accelerating the forming of the titanium alloy billet, and thus helping to improve the overall forming efficiency of the titanium alloy bar. Attached Figure Description

[0044] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments of the present invention will be briefly described below.

[0045] Figure 1 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 1 ;

[0046] Figure 2 for Figure 1 Enlarged view of point A in the image;

[0047] Figure 3 for Figure 1 Enlarged view of point B in the image;

[0048] Figure 4 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 2 ;

[0049] Figure 5 for Figure 4 Enlarged view of point C in the image;

[0050] Figure 6 for Figure 4 Enlarged view of point D in the image;

[0051] Figure 7 This is a three-dimensional structural schematic diagram of one of the two-roll reversible billet rolling mills of the present invention;

[0052] Figure 8 for Figure 7 Enlarged view of point E in the image;

[0053] Figure 9 This is a schematic diagram of the planar structure of the high-speed forging machine of the present invention;

[0054] In the picture:

[0055] 1. Cart-type resistance furnace; 10. Furnace door; 11. First long-shaft cylinder; 12. Cart.

[0056] Induction heating furnace 2,

[0057] High-speed forging machine 3,

[0058] Rack 30,

[0059] Hammering assembly 31, first hydraulic rod 310, pressure block 311, support block 312.

[0060] Adjustment component 32, second long-shaft cylinder 320, mounting housing 321, first motor 322, first gear 323, second gear 324, gripper cylinder 325.

[0061] Rolling mechanism 4,

[0062] Two-roll reversible billet mill 40, conveyor table 400, second motor 401, synchronous belt 402, rolls 403, third gear 404, synchronous pulley 405, roller 406, second hydraulic rod 407, pressure plate 408.

[0063] Coating unit 5,

[0064] First clamping plate 50,

[0065] Second clamping plate 51,

[0066] Drive assembly 52, third motor 520, drive pulley 521, driven pulley 522, belt 523, first cylinder 524.

[0067] Application component 53, second cylinder 530, mounting bracket 531, roller brush 532.

[0068] First conveyor belt 6, second conveyor belt 60, material rack 61, flat trough 610, arc trough 611. Detailed Implementation

[0069] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0070] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual images. They should not be construed as limiting the scope of this patent. To better illustrate the embodiments of the present invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product.

[0071] Reference Figure 1 and Figure 9 As shown, a rolling equipment for reducing surface cracking of titanium alloy bars includes a base, a controller, a trolley-type resistance furnace 1, an induction heating furnace 2, a high-speed forging machine 3, a rolling mechanism 4, and a coating mechanism 5.

[0072] Both the trolley-type resistance furnace 1 and the induction heating furnace 2 are located on top of the base. The high-speed forging machine 3 is located on top of the base. The high-speed forging machine 3 includes a frame 30, a hammering assembly 31, and an adjusting assembly 32. The frame 30 is located on top of the base, the hammering assembly 31 is located between the base and the frame 30, and the adjusting assembly 32 is located on top of the base.

[0073] The coating mechanism 5 is located on the top of the base. The coating mechanism 5 includes a first clamping plate 50, a second clamping plate 51, a drive assembly 52, and an application assembly 53. The first clamping plate 50 is rotatably located on the top of the base via a first rotating shaft. The drive assembly 52 is located on the top of the base. A support column is fixedly provided on the top of the base. The second clamping plate 51 is rotatably located on the top of the support column. The application assembly 53 is located on the outer wall of the support column.

[0074] The rolling mechanism 4 is located on the top of the base. The rolling mechanism 4 includes three two-roll reversible billet mills 40. All three two-roll reversible billet mills 40 are located on the top of the base. The hammering assembly 31, the adjusting assembly 32, the driving assembly 52, and the spreading assembly 53 are electrically connected to the controller.

[0075] Reference Figure 9 As shown, the hammering assembly 31 includes a first hydraulic rod 310, a pressure block 311, and a support block 312. The support block 312 is located on the top of the base, the first hydraulic rod 310 is inserted into the frame 30, and the pressure block 311 is fixedly located on its output end. The first hydraulic rod 310 is electrically connected to the controller. When the ingot is heated and kept at a certain temperature for a specified time, the controller causes the output end of the first long-shaft cylinder 11 to retract, thereby driving the furnace door 10 to rise and push out the trolley 12 and the ingot on it. Then, the ingot is placed on the top of the support block 312. The controller starts the first hydraulic rod 310, causing its output end to extend downward. Since the pressure block 311 is fixedly connected to its output end, it drives the pressure block 311 to hammer the ingot, i.e., to perform high-temperature forging. With the support block 312, the ingot is forged into a square billet after 80%-90% total deformation. After air cooling, it is polished, inspected, and then transferred to rolling for hot processing.

[0076] Reference Figure 2As shown, a furnace door 10 is slidably mounted on one end of a trolley-type resistance furnace 1 via two guide rails. A crossbar is fixedly mounted on the top of the two guide rails, and a first long-shaft cylinder 11 is inserted into the crossbar. Its output end is fixedly connected to the top of the furnace door 10. A track is provided on the top of the base, and a trolley 12 is mounted on the track by four rollers. The first long-shaft cylinder 11 is electrically connected to a controller. During processing, the titanium alloy ingot is first placed on the top of the trolley 12 and pushed into the interior of the trolley-type resistance furnace 1. Then, the controller starts the first long-shaft cylinder 11, causing its output end to... The furnace door 10 extends downwards. Since the furnace door 10 is slidably connected to two guide rails, the top of the furnace door 10 is fixedly connected to the output end of the first long shaft cylinder 11, thereby driving the furnace door 10 to descend, so that the open end of the trolley-type resistance furnace 1 is closed. Then the trolley-type resistance furnace 1 is started to heat the ingot. First, it is heated to 800±10℃ and held for 120±10min. Then, it is heated with the furnace to 100℃-200℃ above the phase transformation point. The stepped heating can effectively solve the problems of low thermal conductivity, large cross-sectional temperature difference and severe gas absorption at high temperature for a long time during the heating process of titanium alloy.

[0077] Reference Figure 4 and Figure 5As shown, the adjustment assembly 32 includes a second long-shaft cylinder 320, a mounting shell 321, a first motor 322, a first gear 323, a second gear 324, and a gripper cylinder 325. A base is fixedly mounted on the top of the base, and two slide rails are fixedly mounted on the top of the base. The mounting shell 321 is slidably mounted on the top of the two slide rails. The second long-shaft cylinder 320 is inserted into the top of the base, and its output end is fixedly connected to one end of the mounting shell 321. A vertical plate is fixedly mounted inside the mounting shell 321. The first motor 322 is inserted into the vertical plate, and the first gear 323 is fixedly mounted on its output end. The second gear 324 is rotatably mounted on the vertical plate via a second rotating shaft. The first gear 323 and the second gear 324 are meshed, and the first gear 323 is smaller than the second gear 324. The second rotating shaft is rotatably connected to the other end of the mounting shell 321. The gripper cylinder 325 is fixedly mounted on the rotating shaft near the second gear 324. The second long-shaft cylinder 320 is electrically connected to the controller. Since the initial ingot is not... The ingot is square in shape. After being heated by the trolley-type resistance furnace 1, it is placed between the pressure block 311 and the support block 312. The end of the ingot closest to the mounting shell 321 is clamped by the gripper cylinder 325. First, the pressure block 311 descends to hammer the ingot, transforming it into a square billet. Then, the controller starts the second long-shaft cylinder 320, which drives the mounting shell 321, the gripper cylinder 325 on it, and the clamped ingot to slide away from the frame 30, so that the entire surface of the ingot is hammered. Once one end of the ingot is hammered flat, the first motor 322 is started by the controller, causing its output end to drive the first gear 323 to rotate. Since the second gear 324 is fixedly connected to the second rotating shaft, and the second rotating shaft is fixedly connected to the gripper cylinder 325, the first gear 323 and the second gear 324 are meshed together, and the first gear 323 is smaller than the second gear 324. Then, the gripper cylinder 325 drives the ingot to rotate, hammering the other surfaces of the ingot until the ingot is hammered into a square billet.

[0078] Reference Figure 7 and Figure 8As shown, each two-roll reversible billet mill 40 includes a conveyor table 400, a second motor 401, a synchronous belt 402, two rolls 403, two third gears 404, and two synchronous pulleys 405. Six support plates are fixedly mounted on the top of the base. The conveyor table 400 is located on the top of the base, and several rollers 406 are rotatably mounted on the conveyor table 400. The two rolls 403 are rotatably mounted between two of the support plates via hinge shafts. Each third gear 404 is fixedly mounted on a hinge shaft, and the two third gears 404 are meshed together. The second motor 401 is fixedly mounted on one of the support plates. Two synchronous pulleys 405 are respectively fixed at its output end and on one of the hinge shafts near the second motor 401. A synchronous belt 402 is sleeved between the two synchronous pulleys 405. The second motor 401 is electrically connected to the controller. The three two-roll reversible billet mills 40 have the same structure, except that the diameter of the rolls 403 on each two-roll reversible billet mill 40 is different. The diameters of the rolls 403 on the three two-roll reversible billet mills 40 are 1350mm, 850mm, and 600mm, respectively. The square billet, after being coated with high-temperature paint and heated, needs to be rolled by these three rolls 403. The rolling process is as follows: after the billet is placed on top of several rollers 406 on the conveyor table 400, the rollers 406 drive the billet to be conveyed between two rolls. At the same time, the second motor 401 is started by the controller, so that its output end rotates counterclockwise. Since the two synchronous pulleys 405 are fixedly connected to their output ends and one of the hinge shafts near the second motor 401 respectively, each third gear 404 is fixedly connected to a hinge shaft, and the two third gears 404 are meshed. The two rolls 403 are rotatably set between two support plates through the hinge shaft, thereby driving the two rolls to rotate from the outside to the inside, rolling the billet conveyed between them.

[0079] Reference Figure 8As shown, each conveyor table 400 has two vertical plates fixed at both ends, and a second hydraulic rod 407 fixed at the top of each vertical plate. A pressure plate 408 is fixed to the output end of each second hydraulic rod 407, and two guide rods are fixed to the outer wall of each pressure plate 408. Each guide rod is inserted into the vertical plate, and each second hydraulic rod 407 is electrically connected to the controller. When the billet is rolled by two rollers 403 and conveyed by the conveyor table 400 to a position close to the two pressure plates 408, the controller activates the two second hydraulic rods 407. This causes the output ends of the two second hydraulic rods 407 to move closer to the end of the titanium alloy billet, thus extruding the billet and ultimately forming it into a bar. It should be noted that this is a single-fire rolling process, i.e., rolling by two 1350mm rollers 403, with a 53% deformation, resulting in a billet size of 180*220*L. The total deformation is 53%, and the rolling speed is 1mps-3mps. The initial cooling method is air cooling. After sawing, peeling, grinding, and inspection, the billet is ready for secondary rolling. Secondary rolling involves first heating in a bogie-type resistance furnace (1) to 960℃ and holding for 130-200 minutes. Then, it is rolled using two 850mm 403 rolls, resulting in a 52% deformation billet to Φ156mm*L. The rolling passes are 5-7, with a total deformation of 52% and a rolling speed of 1-3 mps. Cooling is achieved through online straightening using residual heat. The diameter of the billet is ≤5mm / m, with no dead bends. After air cooling, the billet is sawed, peeled, ground, and inspected before undergoing three-stage rolling. The three-stage rolling process involves first heating in an induction heating furnace (2) to 950℃, then passing it through a Φ600mm two-roll reversible billet mill (40+KOCKS continuous rolling mill) to achieve a deformation of 57%-90% to Φ50mm-Φ100mm. Air cooling is used. It should be noted that the KOCKS continuous rolling mill is not shown in the diagram. This multi-stage, low-deformation rolling process effectively reduces surface cracks in the finished billet, increases the yield by 2-3%, and ultimately yields billets with uniform microstructure and stable performance.

[0080] Reference Figure 3As shown, the drive assembly 52 includes a third motor 520, a drive wheel 521, a driven wheel 522, and a belt 523. The third motor 520 is fixedly mounted on the top of the base. The drive wheel 521 is fixedly mounted on its output end. The driven wheel 522 is fixedly mounted on the first rotating shaft. The belt 523 is sleeved between the drive wheel 521 and the driven wheel 522. The third rotating shaft is rotatably mounted on the top of the support column. A mounting plate is fixedly mounted on the bottom end of the third rotating shaft. A first cylinder 524 is fixedly mounted on the mounting plate, and its output end is fixedly connected to the second clamping plate 51. The third motor 520... Both cylinder 20 and the first cylinder 524 are electrically connected to the controller. After the ingot is made into a square billet and before it is put into the furnace, the square billet is placed horizontally in the flat groove 610 set at the top of the material rack 61 on the first conveyor belt 6. Then, the square billet is transported to the support position by the first conveyor belt 6. Then, the power of the first conveyor belt 6 is turned off, and the square billet is placed vertically on the top of the first clamping plate 50. Then, the controller starts the first cylinder 524, so that its output end extends downward and drives the second clamping plate 51 to descend and press the top of the square billet, thereby cooperating with the first clamping plate 50 to achieve the clamping and fixing of the square billet.

[0081] Reference Figure 3 As shown, the coating assembly 53 includes a second cylinder 530, a mounting bracket 531, and a roller brush 532. The second cylinder 530 is inserted into a support column, and the mounting bracket 531 is fixedly mounted on the output end of the second cylinder 530. The roller brush 532 is rotatably mounted on the mounting bracket 531. The second cylinder 530 is electrically connected to a controller. When the billet is fixed, the controller starts the second cylinder 530, causing its output end to extend towards the end closer to the billet. Since its output end is fixedly connected to the mounting bracket 531, and the roller brush 532 is rotatably connected to the mounting bracket 531, it drives the roller brush 532 to rotate and coat the billet. The billet is coated with a high-temperature resistant coating. A second cylinder 530 is designed to drive the roller brush 532 to extend and retract, making it convenient to apply the high-temperature coating to all surfaces of the billet, thereby improving its oxidation resistance and high-temperature resistance, and facilitating subsequent rolling. It should be noted that the coating drying time is not less than 8 hours. After drying, the billet is sent to the trolley-type resistance furnace 1 and heated to the phase transformation point of 960°C, and held for 200-250 minutes. It should be noted that the roller brush 532 is made of sponge material, which can be poured directly onto the roller brush 532. After absorption, the roller brush 532 can directly apply the coating to the surface of the billet.

[0082] Reference Figure 1 and Figure 6As shown, the top of the base is provided with a first conveyor belt 6 and a second conveyor belt 60, respectively. The top of the first conveyor belt 6 and the second conveyor belt 60 are both fixed with a material rack 61. The first conveyor belt 6 and the second conveyor belt 60 facilitate the sequential transportation of titanium alloy workpieces in the induction heating furnace 2, the high-speed forging machine 3, the rolling mechanism 4 and the coating mechanism 5, thereby improving the transfer efficiency and thus helping to reduce the processing time of titanium alloy bars and improve processing efficiency. It should be noted that the top of the material rack 61 is provided with a flat groove 610 and an arc groove 611, respectively, which facilitates the placement of titanium alloy billets and titanium alloy bars and improves the flexibility of conveying.

[0083] A rolling process for reducing surface cracking of titanium alloy bars includes the following steps:

[0084] S1: Single-fire forging of ingots:

[0085] The titanium alloy ingot is placed on top of the trolley 12 and pushed into the trolley-type resistance furnace 1. Then, the first long-shaft cylinder 11 is started by the controller, so that its output end extends downward. Since the furnace door 10 is slidably connected to the two guide rails, the top of the furnace door 10 is fixedly connected to the output end of the first long-shaft cylinder 11, thereby driving the furnace door 10 to descend, so that the open end of the trolley-type resistance furnace 1 is closed. Then, the trolley-type resistance furnace 1 is started again to heat the ingot. First, it is heated to 800±10℃ and held for 120±10min. Then, it is heated with the furnace to 100℃-200℃ above the phase transformation point. The ingot holding time is D = ingot diameter × 0.70 + 60min.

[0086] After the ingot is heated and held at the specified temperature for a specified time, the controller causes the output end of the first long-shaft cylinder 11 to retract, thereby driving the furnace door 10 to rise and push out the trolley 12 and the ingot on it. Then, the ingot is placed on top of the support block 312. The controller starts the first hydraulic rod 310, causing its output end to extend downward. Since the pressure block 311 is fixedly connected to its output end, it drives the pressure block 311 to hammer the ingot, that is, to forge it into a high-temperature billet. With the support block 312, the ingot is forged into a square billet after 80%-90% total deformation. After air cooling, it is polished, inspected, and then transferred to rolling for hot processing.

[0087] Since the initial ingot is not square, after being heated in the trolley-type resistance furnace 1, the ingot is placed between the pressure block 311 and the support block 312. The clamping cylinder 325 clamps the end of the ingot closest to the mounting shell 321. First, the pressure block 311 descends to hammer the ingot, transforming it into a square billet. Then, the controller activates the second long-shaft cylinder 320, causing the mounting shell 321, its clamping cylinder 325, and the clamped ingot to slide away from the frame 30, thus shaping the entire ingot surface. All surfaces are hammered. After one end of the ingot is hammered flat, the first motor 322 is started by the controller, which drives the first gear 323 to rotate. Since the second gear 324 is fixedly connected to the second rotating shaft, and the second rotating shaft is fixedly connected to the gripper cylinder 325, the first gear 323 and the second gear 324 are meshed. The first gear 323 is smaller than the second gear 324. The gripper cylinder 325 drives the ingot to rotate, hammering the other surfaces of the ingot until the ingot is hammered into a square billet.

[0088] S2: Coating for titanium alloy billets before furnace rolling:

[0089] Before the billet is put into the furnace after the ingot is made into a square billet, the billet is placed horizontally in the flat groove 610 set at the top of the material rack 61 on the first conveyor belt 6. The billet is then transported to the support position by the first conveyor belt 6. Then the power is turned off on the first conveyor belt 6, and the billet is placed vertically on the top of the first clamping plate 50. Then the controller starts the first cylinder 524, so that its output end extends downward and drives the second clamping plate 51 to descend and press the top of the billet, thereby cooperating with the first clamping plate 50 to clamp and fix the billet.

[0090] Once the billet is fixed, the second cylinder 530 is activated by the controller, causing its output end to extend towards the end closest to the billet. Since its output end is fixedly connected to the mounting bracket 531, and the roller brush 532 is rotatably connected to the mounting bracket 531, it drives the roller brush 532 to rotate and apply high-temperature resistant coating to the outer wall of the billet. By designing the second cylinder 530 to drive the roller brush 532 to extend and retract, it is convenient to apply high-temperature coating to all surfaces of the billet. It should be noted that the coating drying time is not less than 8 hours. After drying, the billet is sent to the bogie-type resistance furnace 1 and heated to the phase change point of 960℃, and held for 200-250 minutes.

[0091] S3: First-pass, second-pass, and third-pass rolling of titanium alloy square billets:

[0092] The three two-roll reversible billet mills 40 have the same structure, except that the diameter of the rolls 403 on each two-roll reversible billet mill 40 is different. The diameters of the rolls 403 on the three two-roll reversible billet mills 40 are 1350mm, 850mm and 600mm respectively. The billet, after being coated with high-temperature paint and heated, needs to be rolled by these three rolls 403. The rolling process is as follows: after the billet is placed on top of several rollers 406 on the conveyor table 400, the rollers 406 drive the billet towards the two rolls. The billet is conveyed between the two sides. At the same time, the second motor 401 is started by the controller, so that its output end rotates counterclockwise. Since the two synchronous pulleys 405 are fixedly connected to their output ends and one of the hinge shafts near the second motor 401 respectively, each third gear 404 is fixedly connected to a hinge shaft, and the two third gears 404 are meshed. The two rolls 403 are rotatably set between the two support plates through the hinge shaft, thereby driving the two rolls to rotate from the outside to the inside, rolling the billet conveyed between them.

[0093] When the billet is rolled by two rolls 403 and conveyed by the conveyor table 400 to a position close to the two pressure plates 408, the controller activates two second hydraulic rods 407. This causes the output ends of the two second hydraulic rods 407 to move closer to one end of the titanium alloy billet, thus extruding the billet and ultimately shaping it into a bar. It should be noted that the first rolling process involves rolling the billet through two 1350mm rolls 403, resulting in a 53% deformation, to a size of 180*220*L. The total deformation is 53%, the rolling speed is 1-3 mps, and the cooling method is air cooling. After sawing, peeling, grinding, and inspection, the billet is ready for the second rolling process. The second rolling process involves first heating in a bogie-type resistance furnace 1 to 960℃ and holding for 130-200 minutes, then passing it through two 850mm rolls... The billet is rolled to Φ156mm*L using 403 rollers, with a 52% deformation amount. The rolling passes are 5-7, the total deformation is 52%, and the rolling speed is 1mps-3mps. Cooling method: residual heat online straightening, straightness ≤5mm / m, no dead bends, air cooling. After sawing, peeling, grinding, and inspection, it is ready for three-stage rolling. Three-stage rolling requires first heating in induction heating furnace 2 at 950℃, and then passing through a Φ600mm two-roll reversible billet mill 40+KOCKS continuous rolling mill, with a 57%-90% deformation amount, to Φ50mm-Φ100mm. Cooling method: air cooling. It should be noted that the KOCKS continuous rolling mill is not shown in the diagram. The bar undergoes multiple passes and small deformation rolling, ultimately yielding titanium alloy bars with uniform microstructure and stable performance.

[0094] The working principle of this invention is as follows: During processing, the titanium alloy ingot is first placed on the top of the trolley 12 and pushed into the trolley-type resistance furnace 1. Then, the first long-shaft cylinder 11 is started by the controller, causing its output end to extend downward. Since the furnace door 10 is slidably connected to the two guide rails, the top of the furnace door 10 is fixedly connected to the output end of the first long-shaft cylinder 11, thereby driving the furnace door 10 to descend, so that the open end of the trolley-type resistance furnace 1 is closed. Then, the trolley-type resistance furnace 1 is started to heat the ingot. It is first heated to 800±10℃ and held for 120±10min. Then, it is heated with the furnace to 100℃-200℃ above the phase transformation point. The ingot holding time is D = ingot diameter × 0.70 + 60min. The stepped heating can effectively solve the problems of low thermal conductivity, large cross-sectional temperature difference, and severe gas absorption at high temperature for a long time during the heating process of titanium alloy.

[0095] After the ingot is heated and held at the specified temperature for a specified time, the controller causes the output end of the first long-shaft cylinder 11 to retract, thereby driving the furnace door 10 to rise and push out the trolley 12 and the ingot on it. Then, the ingot is placed on top of the support block 312. The controller starts the first hydraulic rod 310, causing its output end to extend downward. Since the pressure block 311 is fixedly connected to its output end, it drives the pressure block 311 to hammer the ingot, that is, to forge it into a high-temperature billet. With the support block 312, the ingot is forged into a square billet after 80%-90% total deformation. After air cooling, it is polished, inspected, and then transferred to rolling for hot processing.

[0096] Since the initial ingot is not square, after being heated in the trolley-type resistance furnace 1, the ingot is placed between the pressure block 311 and the support block 312. The clamping cylinder 325 clamps the end of the ingot closest to the mounting shell 321. First, the pressure block 311 descends to hammer the ingot, transforming it into a square billet. Then, the controller activates the second long-shaft cylinder 320, causing the mounting shell 321, its clamping cylinder 325, and the clamped ingot to slide away from the frame 30, thus shaping the entire ingot surface. All surfaces are hammered. After one end of the ingot is hammered flat, the first motor 322 is started by the controller, which drives the first gear 323 to rotate. Since the second gear 324 is fixedly connected to the second rotating shaft, and the second rotating shaft is fixedly connected to the gripper cylinder 325, the first gear 323 and the second gear 324 are meshed. The first gear 323 is smaller than the second gear 324. The gripper cylinder 325 drives the ingot to rotate, hammering the other surfaces of the ingot until the ingot is hammered into a square billet.

[0097] Before the billet is put into the furnace after the ingot is made into a square billet, the billet is placed horizontally in the flat groove 610 set at the top of the material rack 61 on the first conveyor belt 6. The billet is then transported to the support position by the first conveyor belt 6. Then the power is turned off on the first conveyor belt 6, and the billet is placed vertically on the top of the first clamping plate 50. Then the controller starts the first cylinder 524, so that its output end extends downward and drives the second clamping plate 51 to descend and press the top of the billet, thereby cooperating with the first clamping plate 50 to clamp and fix the billet.

[0098] After the billet is fixed, the second cylinder 530 is started by the controller, so that its output end extends to the end closer to the billet. Since its output end is fixedly connected to the mounting frame 531, and the roller brush 532 is rotatably connected to the mounting frame 531, it drives the roller brush 532 to rotate and apply high-temperature resistant coating to the outer wall of the billet. By designing the second cylinder 530 to drive the roller brush 532 to extend and retract, it is convenient to apply high-temperature coating to all surfaces of the billet, improve oxidation resistance and high-temperature resistance, and facilitate subsequent rolling. It should be noted that the coating drying time is not less than 8 hours. After drying, it is sent to the bogie-type resistance furnace 1 and heated with the furnace to the phase transformation point of 960℃, and held for 200-250 minutes.

[0099] The three two-roll reversible billet mills 40 have the same structure, except that the diameter of the rolls 403 on each two-roll reversible billet mill 40 is different. The diameters of the rolls 403 on the three two-roll reversible billet mills 40 are 1350mm, 850mm and 600mm respectively. The billet, after being coated with high-temperature paint and heated, needs to be rolled by these three rolls 403. The rolling process is as follows: after the billet is placed on top of several rollers 406 on the conveyor table 400, the rollers 406 drive the billet towards the two rolls. The billet is conveyed between the two sides. At the same time, the second motor 401 is started by the controller, so that its output end rotates counterclockwise. Since the two synchronous pulleys 405 are fixedly connected to their output ends and one of the hinge shafts near the second motor 401 respectively, each third gear 404 is fixedly connected to a hinge shaft, and the two third gears 404 are meshed. The two rolls 403 are rotatably set between the two support plates through the hinge shaft, thereby driving the two rolls to rotate from the outside to the inside, rolling the billet conveyed between them.

[0100] When the billet is rolled by two rolls 403 and conveyed by the conveyor table 400 to a position near the two pressure plates 408, the controller activates two second hydraulic rods 407. This causes the output ends of the two second hydraulic rods 407 to move closer to one end of the titanium alloy billet, thus extruding the billet and ultimately shaping it into a bar. It should be noted that the first rolling process involves rolling the billet with two 1350mm rolls 403, achieving a 53% deformation rate to a size of 180*220*L. The total deformation is 53%, the rolling speed is 1-3 mps, and air cooling is used. After sawing, peeling, grinding, and inspection, the billet is ready for the second rolling process. The second rolling process begins with heating in a bogie-type resistance furnace 1 to 960℃, followed by a holding time of 130℃. After 200 minutes, the billet is rolled through two 850mm rolls of 403 steel to a diameter of Φ156mm*L with a deformation of 52%. The rolling passes are 5-7, the total deformation is 52%, and the rolling speed is 1mps-3mps. The cooling method is online straightening with residual heat, the straightness is ≤5mm / m, there are no dead bends, and it is air-cooled. After sawing, peeling, grinding, and inspection, it is ready for three-stage rolling. The three-stage rolling requires heating in induction heating furnace 2 at a temperature of 950℃, and then passing through a Φ600mm two-roll reversible billet mill 40+KOCKS continuous rolling mill to a diameter of Φ50mm-Φ100mm with a deformation of 57%-90%. The cooling method is air-cooled. It should be noted that the KOCKS continuous rolling mill is not shown in the figure. By performing multiple heat treatments and small deformation rolling on the bars, surface cracks and defects in the finished bars can be effectively reduced, the yield can be increased by 2-3%, and bars with uniform structure and stable performance can be obtained.

Claims

1. A rolling equipment for reducing surface cracking of titanium alloy bars, comprising a base, characterized in that: It also includes a controller, a trolley-type resistance furnace (1), an induction heating furnace (2), a high-speed forging machine (3), a rolling mechanism (4), and a coating mechanism (5). Both the trolley-type resistance furnace (1) and the induction heating furnace (2) are located on top of the base. A high-speed forging machine (3) is located on top of the base. The high-speed forging machine (3) is used to forge ingots into square billets. The high-speed forging machine (3) includes a frame (30), a hammering assembly (31), and an adjusting assembly (32). The frame (30) is located on top of the base, the hammering assembly (31) is located between the base and the frame (30), and the adjusting assembly (32) is located on top of the base and is used to drive the titanium alloy ingot to rotate and move. The coating mechanism (5) is located on the top of the base. The coating mechanism (5) includes a first clamping plate (50), a second clamping plate (51), a drive assembly (52), and an application assembly (53). The first clamping plate (50) is rotatably located on the top of the base via a first rotating shaft. The drive assembly (52) is located on the top of the base. A support column is fixedly provided on the top of the base. The second clamping plate (51) is rotatably located on the top of the support column. The application assembly (53) is located on the outer wall of the support column. The rolling mechanism (4) is located on the top of the base. The rolling mechanism (4) includes three two-roll reversible billet mills (40). All three two-roll reversible billet mills (40) are located on the top of the base. The hammering assembly (31), the adjusting assembly (32), the driving assembly (52), and the smearing assembly (53) are electrically connected to the controller. Among them, the three two-roll reversible billet rolling mills (40) have different diameters of rolls (403), which are used for the first-fire rolling, second-fire rolling and third-fire rolling of square billets respectively. The square billet is rolled by the rolls (403) of the three two-roll reversible billet rolling mills (40) to obtain the finished product. The second-fire rolling of the square billet is heated by a trolley-type resistance furnace (1), and the third-fire rolling of the square billet is heated by an induction heating furnace (2).

2. The rolling equipment for reducing surface cracking of titanium alloy bars according to claim 1, characterized in that: The hammering assembly (31) includes a first hydraulic rod (310), a pressure block (311), and a support block (312). The support block (312) is located on the top of the base. The first hydraulic rod (310) is inserted into the frame (30). The pressure block (311) is fixed on its output end. The first hydraulic rod (310) is electrically connected to the controller.

3. The rolling equipment for reducing surface cracking of titanium alloy bars according to claim 2, characterized in that: A furnace door (10) is slidably provided at one end of a trolley-type resistance furnace (1) via two guide rails. A crossbar is fixedly provided at the top of the two guide rails, and a first long-shaft cylinder (11) is inserted on the crossbar. Its output end is fixedly connected to the top of the furnace door (10). A track is provided at the top of the base, and a trolley (12) is slidably provided on the track via four rollers. The first long-shaft cylinder (11) is electrically connected to the controller.

4. The rolling equipment for reducing surface cracking of titanium alloy bars according to claim 3, characterized in that: The adjustment assembly (32) includes a second long-shaft cylinder (320), a mounting housing (321), a first motor (322), a first gear (323), a second gear (324), and a gripper cylinder (325). A base is fixedly mounted on the top of the base, and two slide rails are fixedly mounted on the top of the base. The mounting housing (321) is slidably mounted on the top of the two slide rails. The second long-shaft cylinder (320) is inserted into the top of the base, and its output end is fixedly connected to one end of the mounting housing (321). A vertical plate is fixedly mounted inside the mounting housing (321). A motor (322) is inserted on a vertical plate. A first gear (323) is fixed on its output end. A second gear (324) is rotatably mounted on the vertical plate via a second rotating shaft. The first gear (323) and the second gear (324) are meshed and connected. The first gear (323) is smaller than the second gear (324). The second rotating shaft is rotatably connected to the other end of the mounting housing (321). A gripper cylinder (325) is fixed on the end of the second rotating shaft near the second gear (324). A second long-shaft cylinder (320) is electrically connected to the controller.

5. The rolling equipment for reducing surface cracking of titanium alloy bars according to claim 4, characterized in that: Each two-roll reversible billet mill (40) includes a conveyor table (400), a second motor (401), a synchronous belt (402), two rolls (403), two third gears (404), and two synchronous pulleys (405). Six support plates are fixedly provided on the top of the base. The conveyor table (400) is located on the top of the base. Several rollers (406) are rotatably provided on the conveyor table (400). The two rolls (403) are rotatably set between two of the support plates through a hinge shaft. Each third gear (404) is fixedly set on a hinge shaft. The two third gears (404) are meshed and connected. The second motor (401) is fixedly set on one of the support plates. The two synchronous pulleys (405) are respectively fixed on their output end and on one of the hinge shafts near the second motor (401). The synchronous belt (402) is sleeved between the two synchronous pulleys (405). The second motor (401) is electrically connected to the controller.

6. The rolling equipment for reducing surface cracking of titanium alloy bars according to claim 5, characterized in that: Two upright plates are fixed at both ends of each conveyor (400). A second hydraulic rod (407) is fixed at the top of each upright plate. A pressure plate (408) is fixed at the output end of each second hydraulic rod (407). Two guide rods are fixed on the outer wall of each pressure plate (408). Each guide rod is inserted into the upright plate. Each second hydraulic rod (407) is electrically connected to the controller.

7. The rolling equipment for reducing surface cracking of titanium alloy bars according to claim 6, characterized in that: The drive assembly (52) includes a third motor (520), a drive wheel (521), a driven wheel (522), and a belt (523). The third motor (520) is fixedly mounted on the top of the base. The drive wheel (521) is fixedly mounted on its output end. The driven wheel (522) is fixedly mounted on the first rotating shaft. The belt (523) is sleeved between the drive wheel (521) and the driven wheel (522). The top of the support column is rotatably mounted on the third rotating shaft. The bottom end of the third rotating shaft is fixedly mounted on the mounting plate. The first cylinder (524) is fixedly mounted on the mounting plate. Its output end is fixedly connected to the second clamping plate (51). The third motor (520) and the first cylinder (524) are both electrically connected to the controller.

8. The rolling equipment for reducing surface cracking of titanium alloy bars according to claim 7, characterized in that: The coating assembly (53) includes a second cylinder (530), a mounting bracket (531), and a roller brush (532). The second cylinder (530) is inserted into the support column, the mounting bracket (531) is fixedly mounted on the output end of the second cylinder (530), and the roller brush (532) is rotatably mounted on the mounting bracket (531). The second cylinder (530) is electrically connected to the controller.

9. A rolling equipment for reducing surface cracking of titanium alloy bars according to claim 8, characterized in that: The top of the base is provided with a first conveyor belt (6) and a second conveyor belt (60), and the top of the first conveyor belt (6) and the second conveyor belt (60) are both fixedly provided with a material rack (61).

10. A process for preparing titanium alloy bars using rolling equipment to reduce surface cracking of titanium alloy bars according to claim 9, characterized in that, Includes the following steps: S1: Single-fire forging of ingots: The titanium alloy ingot is placed on the top of the trolley (12) and pushed into the interior of the trolley-type resistance furnace (1). Then, the first long shaft cylinder (11) is started by the controller, so that its output end extends downward. Since the furnace door (10) is slidably connected to the two guide rails, the top of the furnace door (10) is fixedly connected to the output end of the first long shaft cylinder (11), thereby driving the furnace door (10) to descend, so that the open end of the trolley-type resistance furnace (1) is closed. Then, the trolley-type resistance furnace (1) is started again to heat the ingot. First, it is heated to 800±10℃, held for 120±10min, and then heated with the furnace to 100℃-200℃ above the phase transformation point. After the ingot is heated and kept warm for a specified time, the output end of the first long shaft cylinder (11) is contracted by the controller, thereby driving the furnace door (10) to rise and push out the trolley (12) and the ingot on it. Then the ingot is placed on the top of the support block (312). The first hydraulic rod (310) is started by the controller, thereby causing its output end to extend downward. Since the pressure block (311) is fixedly connected to its output end, the pressure block (311) is driven to hammer the ingot, that is, to forge a high temperature billet. With the support block (312), the ingot is forged into a square billet after 80%-90% total deformation. After air cooling, it is polished, inspected and then rolled for hot processing. Since the initial ingot is not square, after being heated in the trolley-type resistance furnace (1), the ingot is placed between the pressure block (311) and the support block (312). The end of the ingot closest to the mounting shell (321) is clamped by the gripper cylinder (325). First, the pressure block (311) lowers to hammer the ingot, transforming it into a square billet. Then, the controller activates the second long-shaft cylinder (320), causing the mounting shell (321), its gripper cylinder (325), and the clamped ingot to slide away from the frame (30), thus transforming the entire ingot... The surface of the ingot is hammered. After one end of the ingot is hammered flat, the first motor (322) is started by the controller, so that its output end drives the first gear (323) to rotate. Since the second gear (324) is fixedly connected to the second shaft, and the second shaft is fixedly connected to the gripper cylinder (325), the first gear (323) and the second gear (324) are meshed. The first gear (323) is smaller than the second gear (324). Then, the gripper cylinder (325) drives the ingot to rotate, and hammers the other surfaces of the ingot until the ingot is hammered into a square billet. S2: Coating for titanium alloy billets before furnace rolling: Before the billet is put into the furnace after the ingot is made into a square billet, the billet is placed horizontally in the flat groove (610) set at the top of the material rack (61) on the first conveyor belt (6). The billet is then transported to the support position by the first conveyor belt (6). Then the power is cut off to the first conveyor belt (6), and the billet is placed vertically on the top of the first clamping plate (50). Then the controller starts the first cylinder (524), so that its output end extends downward and drives the second clamping plate (51) to descend and press the top of the billet, thereby cooperating with the first clamping plate (50) to achieve the clamping and fixing of the billet. After the billet is fixed, the second cylinder (530) is started by the controller, so that its output end extends to the end close to the billet. Since its output end is fixedly connected to the mounting frame (531), the roller brush (532) is rotatably connected to the mounting frame (531), thereby driving the rotation to apply high-temperature resistant coating to the outer wall of the billet. By designing the second cylinder (530) to drive the roller brush (532) to extend and retract, it is convenient to apply high-temperature coating to all surfaces of the billet. The coating drying time is not less than 8 hours. After drying, it is sent to the trolley-type resistance furnace (1) and heated to the phase change point of 960℃ with the furnace, and kept warm for 200min-250min. S3: First-pass, second-pass, and third-pass rolling of titanium alloy square billets: The three two-roll reversible billet mills (40) have the same structure, except that the diameter of the rolls (403) on each two-roll reversible billet mill (40) is different. The diameters of the rolls (403) on the three two-roll reversible billet mills (40) are 1350mm, 850mm and 600mm respectively. The billet after being coated with high-temperature paint and heated needs to be rolled by these three rolls (403). The rolling process is as follows: after the billet is placed on top of several rollers (406) on the conveyor table (400), the rollers (406) drive the billet towards The two rollers are conveyed together. At the same time, the second motor (401) is started by the controller, so that its output end rotates counterclockwise. Since the two synchronous pulleys (405) are fixedly connected to their output end and one of the hinge shafts near the second motor (401), each third gear (404) is fixedly connected to a hinge shaft. The two third gears (404) mesh with each other. The two rollers (403) are rotatably set on the two support plates through the hinge shaft, thereby driving the two rollers to rotate from the outside to the inside, rolling the billet conveyed between them. When the billet is rolled by two rolls (403) and conveyed by the conveyor table (400) to the area between the two pressure plates (408), the controller starts the two second hydraulic rods (407), so that the output ends of the two second hydraulic rods (407) move closer to the end of the titanium alloy billet, thereby extruding the billet and making it into a bar. It should be noted that the first rolling is rolled by two 1350mm rolls (403), and the billet is rolled to 180*220*L with 53% deformation. The rolling passes are 11-13 times, the rolling speed is 1m / s-3m / s, and the cooling method is air cooling. After sawing, peeling, grinding, and inspection, it is ready for the second rolling. The second rolling is first heated by a bogie-type resistance furnace (1). The billet is heated to 960℃ in the furnace and held for 130-200 minutes. Then it is rolled by two 850mm rolls (403) and rolled to Φ156mm*L with 52% deformation. The rolling passes are 5-7 times and the total deformation is 52%. The rolling speed is 1m / s-3m / s. The cooling method is: online straightening with residual heat, straightness ≤5mm / m, no dead bends, air cooling. After sawing, peeling, grinding and inspection, it is ready for three-fire rolling. Three-fire rolling requires heating in an induction heating furnace (2) at 950℃. Then it is rolled to Φ50mm-Φ100mm by a Φ600mm two-roll reversible billet mill (40) + KOCKS continuous rolling mill with 57%-90% deformation. The cooling method is: air cooling.

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