High-precision rolling process for hot-rolled wear-resistant steel balls

Abstract

The invention belongs to the technical field of steel ball machining, and discloses a high-precision rolling process for hot-rolled wear-resistant steel balls, which comprises the following steps: S1, selecting high-carbon chromium steel, high-manganese steel or carburizing steel according to wear resistance requirements, ensuring that the carbon content is 1.0-1.2% and the chromium content is 10-15%, rolling a steel ingot into a round steel bar with a fixed specified diameter, cutting the round steel bar into short billets by a high-precision cutting machine, and rolling the short billets into steel balls; the end face flatness of the blank is smaller than or equal to 0.1 mm; the invention further provides high-precision rolling equipment for the hot-rolled wear-resistant steel balls, the high-precision rolling equipment comprises the skew rolling mill shell and the cooling tank, the rollers are arranged on the inner wall of the skew rolling mill shell, and the high-precision rolling equipment further comprises the driving rollers and the cooling tank, and the driving rollers are arranged on the outer walls of the rollers through the connecting mechanisms; through cooperation of structures such as the tooth blocks and the rubber blocks, when the driving roller drives the roller to rotate, the tooth blocks can extrude the rubber blocks, the rubber blocks move and are matched with movement of the sliding rods, a good buffering effect can be achieved, vibration impact of the tooth blocks on the rubber blocks is reduced, damage is avoided, and the service life is prolonged.

Description

Technical Field

[0001] The invention belongs to the technical field of steel ball processing, in particular to a high-precision rolling process for hot-rolled wear-resistant steel balls. Background Art

[0002] In the hot rolling process of steel balls, the oblique rolling mill is a special equipment that uses the spiral hole oblique rolling forming process to produce wear-resistant steel balls. It is usually composed of a main motor, a reducer, a composite device, a universal coupling, a working host, etc. Through two inclined rollers with spiral holes rotating in the same direction, the high-temperature steel billet is driven to rotate in the opposite direction and move forward, and is rolled into steel balls.

[0003] The main motor drive rollers of some existing inclined rolling mills are connected to the rolling rollers through splines, spline grooves and flange bolts. A small clearance is usually required between the splines and the spline grooves to ensure assembly and transmission flexibility. However, during long-term operation, the two will generate impact loads due to frequent collisions, which will cause fatigue wear, plastic deformation and even tooth fracture of the spline teeth and the edges of the spline grooves. At the same time, impact vibration will aggravate the loosening of bolts and wear of the flange joint surface, ultimately affecting the transmission accuracy and stability. Therefore, a high-precision rolling process for hot-rolled wear-resistant steel balls is proposed to address the above problems. Summary of the Invention

[0004] In order to solve the problems raised in the above background technology, the present invention provides a high-precision rolling process for hot-rolled wear-resistant steel balls, which solves the problem of accelerated wear caused by long-term collision between splines and spline grooves in the prior art.

[0005] To achieve the above object, the present invention provides the following technical solution: a high-precision rolling process for hot-rolled wear-resistant steel balls, comprising the following steps: S1. Select high carbon chromium steel, high manganese steel or carburizing steel according to the wear resistance requirements, ensure the carbon content is 1.0%-1.2%, and the chromium content is 10%-15%. Roll the steel ingot into round steel bars with the specified diameter, and cut them into short billets with a high-precision cutting machine. The billet end surface flatness is ≤0.1mm; S2. The billet is fed into a continuous heating furnace and sequentially undergoes low-temperature preheating, medium-temperature heating, and high-temperature austenitization. The heating rate is ≤10°C / s. Thermocouples are arranged in different zones in the furnace to ensure that the temperature difference of the billet is ≤±10°C. S3. Use a skew rolling mill for rolling. Optimize the pass curve through finite element simulation. Adjust the roll inclination to 3°-15°, control the roll gap tolerance to ±0.05mm, and rotate the rolls at 50-200r / min. Deformation in a single pass is ≤30%, and multiple passes are used for gradual forming. The rolling pressure is controlled by a servo system to ensure that the roundness error of the steel ball is ≤0.1mm and the diameter tolerance is ≤±0.05mm. S4. After rolling, the hot steel balls are directly put into the quenching tank for cooling. The cooling rate is ≥50℃ / s, ensuring that the surface to the core are transformed into martensite structure, with a surface hardness of HRC58-65. The quenching water temperature is ≤30℃, and the water filtration accuracy is ≤5μm. S5. After quenching, the steel balls are sent to the tempering furnace and kept at 200-300℃ for 1-2 hours to eliminate internal stress. After tempering, the hardness drops to ≤2HRC. The surface oxide scale is removed by shot blasting machine and the surface roughness is controlled at Ra≤1.6μm. S6. Laser diameter measuring instrument detects the diameter of each particle, roundness meter detects the sphericity, out-of-defect products are eliminated, random sampling is carried out for hardness testing, metallographic analysis, and non-destructive testing.

[0006] The present application also proposes a high-precision rolling equipment for hot-rolled wear-resistant steel balls, comprising a cross-rolling mill housing and a cooling tank, wherein the inner wall of the cross-rolling mill housing is provided with a rolling roller, and further comprising: A driving roller, the driving roller being arranged on the outer wall of the roller via a connecting mechanism; A blanking mechanism, the blanking mechanism being arranged on the outer wall of the inclined rolling mill housing; A toggle mechanism, the toggle mechanism being arranged outside the blanking mechanism; Wherein, the connecting mechanism includes a connecting block, the outer wall of the connecting block is slidably connected to a sliding ring, the outer wall of the sliding ring is fixedly connected to a sliding rod, the outer wall of the sliding rod is fixedly connected to a rubber pad, and the inner wall of the connecting block is elastically connected to a rubber block via a connecting spring.

[0007] Preferably, the connecting mechanism also includes a tooth block, which is fixedly connected to the outer wall of the driving roller, the sliding rod is elastically connected to the inner wall of the connecting block through a reset spring, the rubber block is hinged to the outer wall of the bottom end of the sliding rod through a hinge rod, and the inner wall of the connecting block is provided with a groove.

[0008] Preferably, one end of the connecting spring is fixedly connected to the outer wall of the rubber block, and the other end of the connecting spring is fixedly connected to the inner wall of the connecting block. The rubber block is slidably connected in the inner wall of the connecting block, and the rubber block contacts the outer wall of the tooth block.

[0009] Preferably, one end of the return spring is fixedly connected to the inner wall of the connecting block, the other end of the return spring is fixedly connected to the outer wall of the slide rod, the slide rod is slidably connected in the inner wall of the connecting block, the two ends of the hinged rod are respectively hinged to the outer wall of the slide rod and the rubber block, and the rubber pad is in contact with the inner wall of the groove.

[0010] Preferably, the blanking mechanism includes a fixed block, the outer wall of the fixed block is hinged with a blanking plate A, the outer wall of the blanking plate A is hinged with a blanking plate B, the outer walls of the blanking plates A and B are fixedly connected with a folding baffle, and the outer wall of the bottom end of the blanking plate B is hinged with a slider.

[0011] Preferably, the fixed block is fixedly connected to the outer wall of the inclined rolling mill housing, and the sliding block is slidably connected to the bottom inner wall of the cooling trough.

[0012] Preferably, the toggle mechanism includes a mounting block, the inner wall of the mounting block is clamped with a brush, the inner wall of the brush is slidably connected to a moving rod, the outer wall of the moving rod is fixedly connected to a trapezoidal block, the inner wall of the brush is elastically connected to a square block through a telescopic spring, the inner wall of the brush is slidably connected to a short rod, and the inner wall of the mounting block is provided with a square groove.

[0013] Preferably, the mounting block is fixedly connected to the outer wall of the slider, the trapezoidal block is slidably connected to the inner wall of the brush, one end of the short rod is slidably connected to the outer wall of the trapezoidal block, and the other end of the short rod is fixedly connected to the outer wall of the square block.

[0014] Preferably, one end of the telescopic spring is fixedly connected to the outer wall of the square block, and the other end of the telescopic spring is fixedly connected to the inner wall of the brush. The square block is slidably connected in the inner wall of the brush, and the square block is engaged with the square groove.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a combination of structures such as tooth blocks and rubber blocks. When the driving roller drives the roller to rotate, the tooth blocks squeeze the rubber blocks. The rubber blocks move and cooperate with the movement of the slide rod. The rubber pads contact the inner wall of the groove to generate a large friction force, which can achieve a good buffering effect, reduce the vibration impact of the tooth blocks on the rubber blocks, avoid damage, and increase the service life. The present invention provides a blanking plate A and a blanking plate B, and when the steel balls are rolled and unloaded, the blanking plate A and the blanking plate B are continuously flipped, and the position of the lower opening of the blanking plate B in the cooling tank is continuously moved, so that the steel balls can fall at different positions in the cooling tank, thereby preventing the steel balls from accumulating in the cooling tank, ensuring its cooling effect, and preventing damage or cracking caused by collision between the steel balls. The present invention cooperates with structures such as brushes and square blocks. When the slider moves, the brushes will move continuously. The brushes can push the steel balls to roll in the cooling tank, remove impurities on their surfaces, and evenly cool the surfaces of the steel balls, avoiding the problem of uneven cooling effect caused by the steel balls being unable to move in the cooling tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the main structure of the present invention; Figure 2 This is a schematic diagram of the exploded structure of the driving roller, connecting block, and cross-rolling mill housing of the present invention; Figure 3This is a schematic diagram of the exploded cross-section of the driving roller and the connecting block of the present invention; Figure 4 For the present invention Figure 3 A schematic diagram of the enlarged structure of part A; Figure 5 This is a schematic diagram of the cross-sectional structure of the connecting block of the present invention; Figure 6 It is a structural diagram of the blanking mechanism and the shifting mechanism of the present invention; Figure 7 It is a schematic structural diagram of the cross-rolling mill housing, cooling tank cross section, blanking mechanism, and toggle mechanism of the present invention; Figure 8 This is a schematic diagram of the cross-sectional structure of the cross-rolling mill housing and cooling tank of the present invention; Figure 9 This is a schematic diagram of the cross section of the brush and the exploded structure of the mounting block of the present invention; Figure 10 For the present invention Figure 9 Schematic diagram of the enlarged structure of part B.

[0017] In the figure: 100, oblique rolling mill housing; 200, driving roller; 300, connecting mechanism; 301, connecting block; 302, sliding ring; 303, connecting spring; 304, rubber block; 305, hinged rod; 306, sliding rod; 307, rubber pad; 308, reset spring; 309, tooth block; 310, groove; 400, unloading mechanism; 401, fixed block; 402, unloading plate A; 403, unloading plate B; 404, folding baffle; 405, slider; 500, toggle mechanism; 501, mounting block; 502, brush; 503, moving rod; 504, telescopic spring; 505, square block; 506, short rod; 507, trapezoidal block; 508, square groove; 600, rolling roller; 700, cooling trough. DETAILED DESCRIPTION

[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0019] The present invention provides a high-precision rolling process for hot-rolled wear-resistant steel balls, comprising the following steps: S1. Select high carbon chromium steel, high manganese steel or carburizing steel according to the wear resistance requirements, ensure the carbon content is 1.0%-1.2%, and the chromium content is 10%-15%. Roll the steel ingot into round steel bars with the specified diameter, and cut them into short billets with a high-precision cutting machine. The billet end surface flatness is ≤0.1mm; S2. The billet is fed into a continuous heating furnace and sequentially undergoes low-temperature preheating, medium-temperature heating, and high-temperature austenitization. The heating rate is ≤10°C / s. Thermocouples are arranged in different zones in the furnace to ensure that the temperature difference of the billet is ≤±10°C. S3. Use a skew rolling mill for rolling. Optimize the pass curve through finite element simulation. Adjust the roll inclination to 3°-15°, control the roll gap tolerance to ±0.05mm, and rotate the rolls at 50-200r / min. Deformation in a single pass is ≤30%, and multiple passes are used for gradual forming. The rolling pressure is controlled by a servo system to ensure that the roundness error of the steel ball is ≤0.1mm and the diameter tolerance is ≤±0.05mm. S4. After rolling, the hot steel balls are directly put into the quenching tank for cooling. The cooling rate is ≥50℃ / s, ensuring that the surface to the core are transformed into martensite structure, with a surface hardness of HRC58-65. The quenching water temperature is ≤30℃, and the water filtration accuracy is ≤5μm. S5. After quenching, the steel balls are sent to the tempering furnace and kept at 200-300℃ for 1-2 hours to eliminate internal stress. After tempering, the hardness drops to ≤2HRC. The surface oxide scale is removed by shot blasting machine and the surface roughness is controlled at Ra≤1.6μm. S6. Laser diameter measuring instrument detects the diameter of each particle, roundness meter detects the sphericity, out-of-defect products are eliminated, random sampling is carried out for hardness testing, metallographic analysis, and non-destructive testing.

[0020] like Figures 1 to 10 As shown, the present application also proposes a high-precision rolling equipment for hot-rolled wear-resistant steel balls, comprising a cross-rolling mill housing 100 and a cooling tank 700, wherein the inner wall of the cross-rolling mill housing 100 is provided with a rolling roller 600, and further comprising: a driving roller 200, wherein the driving roller 200 is provided on the outer wall of the rolling roller 600 through a connecting mechanism 300; a blanking mechanism 400, wherein the blanking mechanism 400 is provided on the outer wall of the cross-rolling mill housing 100; and a toggle mechanism 500, wherein the toggle mechanism 500 is provided outside the blanking mechanism 400; Among them, the connecting mechanism 300 includes a connecting block 301, the outer wall of the connecting block 301 is slidably connected to a sliding ring 302, the outer wall of the sliding ring 302 is fixedly connected to a sliding rod 306, the outer wall of the sliding rod 306 is fixedly connected to a rubber pad 307, and the inner wall of the connecting block 301 is elastically connected to a rubber block 304 through a connecting spring 303.

[0021] The above scheme is adopted: the oblique rolling mill shell 100 and the roller 600 can be used to roll the steel balls, which is the existing technology. The driving roller 200 is connected to the external motor, reducer and other driving equipment, and it can be connected and fixed with the roller 600 through flanges and bolts. The driving equipment can drive the two groups of rollers 600 to rotate for rolling through the driving roller 200; the driving roller 200 and the flange can be fixed by splines and spline grooves to ensure the accuracy of the transmission. The tooth block 309 and the connecting mechanism 300 play the role of splines and spline grooves. The connecting block 301 is fixed on a group of flanges, which can be connected to the driving roller 200; the connecting mechanism 300 can reduce the vibration and noise generated by the collision between the tooth block 309 on the driving roller 200 and the flange when the driving roller 200 rotates, thereby improving the service life.

[0022] like Figures 2 to 5 As shown, the connecting mechanism 300 also includes a tooth block 309, which is fixedly connected to the outer wall of the driving roller 200, and the slide rod 306 is elastically connected to the inner wall of the connecting block 301 through a return spring 308. The rubber block 304 is hinged to the outer wall of the bottom end of the slide rod 306 through a hinge rod 305, and a groove 310 is provided on the inner wall of the connecting block 301.

[0023] The above solution is adopted: the tooth blocks 309 are distributed at equal angles on the outer wall of the driving roller 200, and the connecting block 301 is provided with tooth grooves corresponding to the positions of the tooth blocks 309. When the driving roller 200 is connected to the flange, one end of the tooth block 309 can be inserted into the connecting block 301, and the tooth block 309 contacts the rubber block 304. The flexible contact reduces the vibration generated during collision; the sliding ring 302 can move on the outer wall of the connecting block 301 but cannot rotate. When it moves, it can drive multiple groups of sliding rods 306 to move synchronously. Under normal conditions, the return spring 308 keeps the sliding rod 306 in a certain position, and the connecting spring 303 keeps the rubber block 304 in a fixed state, and the rubber block 304 is in the middle position.

[0024] like Figures 2 to 5 As shown, one end of the connecting spring 303 is fixedly connected to the outer wall of the rubber block 304, and the other end of the connecting spring 303 is fixedly connected to the inner wall of the connecting block 301. The rubber block 304 is slidably connected in the inner wall of the connecting block 301, and the rubber block 304 contacts the outer wall of the tooth block 309; one end of the return spring 308 is fixedly connected to the inner wall of the connecting block 301, and the other end of the return spring 308 is fixedly connected to the outer wall of the sliding rod 306. The sliding rod 306 is slidably connected in the inner wall of the connecting block 301. The two ends of the hinged rod 305 are hinged to the sliding rod 306 and the outer wall of the rubber block 304 respectively, and the rubber pad 307 contacts the inner wall of the groove 310.

[0025] The above solution is adopted: when the sliding ring 302 moves on the outer wall of the connecting block 301, it will drive the sliding rod 306 to move synchronously, and the sliding rod 306 will drive the two sets of hinged rods 305 to move synchronously. The hinged rod 305 drives the rubber block 304 to move. Since the rubber block 304 can only move laterally on the inner wall of the connecting block 301, the hinged rod 305 will flip over and drive the rubber block 304 to move to both sides. At this time, the tooth block 309 can be inserted into the tooth groove of the connecting block 301, and then the elastic force of the connecting spring 303 will cause the tooth block 309 to pop out and fit tightly with the surface of the tooth block 309.

[0026] When the driving roller 200 rotates, the flange is driven to rotate through the tooth block 309 and the connecting block 301, and the flange drives the roller 600 to rotate to roll the steel ball. During this process, the tooth block 309 will generate pressure on the rubber block 304, and the rubber block 304 will move to both sides. The hinge rod 305 is flipped to drive the slide bar 306 to move. At this time, the rubber pad 307 will move along the inner wall of the groove 310 and alternately contact the inner wall of the groove 310 and the connecting block 301. It will be squeezed and deformed, which can generate a large friction force, reduce the movement amplitude of the slide bar 306, and then reduce the displacement amplitude of the rubber block 304 due to the pressure of the tooth block 309, so that the impact force of the tooth block 309 is reduced, and long-term collisions can be avoided to prevent internal damage to the tooth block 309 and the connecting block 301.

[0027] like Figures 6 to 8 As shown, the blanking mechanism 400 includes a fixed block 401, the outer wall of the fixed block 401 is hinged with a blanking plate A402, the outer wall of the blanking plate A402 is hinged with a blanking plate B403, the outer walls of the blanking plates A402 and B403 are fixedly connected with a folding baffle 404, and the outer wall of the bottom end of the blanking plate B403 is hinged with a slider 405.

[0028] The above solution is adopted: a motor is provided in the fixed block 401, and the output shaft of the motor is fixedly connected to the blanking plate A402. By controlling the forward and reverse rotation of the output shaft of the motor, the blanking plate A402 can be driven to flip up and down continuously. During the flipping process, it always maintains an inclined state. The rolled steel balls will fall on the blanking plate A402 and roll down to the blanking plate B403, and roll along the surface of the blanking plate B403 to the cooling tank 700 for cooling; the folding baffle 404 is provided between the connection between the blanking plate A402 and the blanking plate B403. The folding baffle 404 is made of glass fiber cloth and can be folded like a fan. When the angle between the blanking plate A402 and the blanking plate B403 is close to a right angle, the folding baffle 404 is fully unfolded. Figure 7 shown.

[0029] like Figures 6 to 8 As shown, the fixed block 401 is fixedly connected to the outer wall of the cross-rolling mill housing 100 , and the slider 405 is slidably connected to the bottom inner wall of the cooling tank 700 .

[0030] Adopting the above scheme: when the blanking plate A402 turns over, it will drive the blanking plate B403 to turn over synchronously. When the blanking plate A402 turns down, the blanking plate B403 moves downward synchronously with the end connected to it, and the other end moves synchronously with the slider 405 to the side away from the inclined rolling mill housing 100. Figure 8 As shown, the blanking plate A402 and the blanking plate B403 will be close to a flat angle state, and when the blanking plate A402 flips upward, the blanking plate B403 will move in the opposite direction synchronously with the slider 405, so that the blanking plate A402 and the blanking plate B403 are close to a right angle, so that in the process of unloading the steel balls, the blanking plate A402 and the blanking plate B403 are continuously flipped, so that the steel balls can fall at different positions in the cooling tank 700, thereby avoiding the problem that the position of the blanking plate is fixed, causing the steel balls to fall at the same position in the cooling tank 700, resulting in the accumulation of steel balls affecting the cooling rate.

[0031] like Figures 8 to 10 As shown, the toggle mechanism 500 includes a mounting block 501, the inner wall of the mounting block 501 is clamped with a brush 502, the inner wall of the brush 502 is slidably connected to a moving rod 503, the outer wall of the moving rod 503 is fixedly connected to a trapezoidal block 507, the inner wall of the brush 502 is elastically connected to a square block 505 via a telescopic spring 504, the inner wall of the brush 502 is slidably connected to a short rod 506, and the inner wall of the mounting block 501 is provided with a square groove 508.

[0032] Adopting the above scheme: the brush 502 will move back and forth synchronously with the slider 405. When the brush 502 moves, it will contact the surface of the steel ball, and remove the oxide scale, debris and other impurities remaining on the surface of the steel ball to avoid the formation of a heat insulation layer that causes the local cooling speed of the steel ball to slow down. It can also assist the steel ball to roll continuously to ensure all-round cooling of the steel ball. The brush 502 can be fixed to the inside of the mounting block 501 by clamping the square block 505 and the square groove 508. This method facilitates the disassembly and installation of the brush 502.

[0033] like Figures 8 to 10 As shown, the mounting block 501 is fixedly connected to the outer wall of the slider 405, the trapezoidal block 507 is slidably connected to the inner wall of the brush 502, one end of the short rod 506 is slidably connected to the outer wall of the trapezoidal block 507, and the other end of the short rod 506 is fixedly connected to the outer wall of the square block 505; one end of the telescopic spring 504 is fixedly connected to the outer wall of the square block 505, and the other end of the telescopic spring 504 is fixedly connected to the inner wall of the brush 502, the square block 505 is slidably connected to the inner wall of the brush 502, and the square block 505 is engaged with the square groove 508.

[0034] Adopt the above scheme: in normal state, the expansion spring 504 keeps the square block 505 in the pop-up state, the short rod 506 is in contact with the long side inclined surface of the trapezoidal block 507, the trapezoidal block 507 is in a certain position with the moving rod 503, when the moving rod 503 is pressed inward, the trapezoidal block 507 will move inward synchronously, the inclined surface drives the short rod 506 to move, since the short rod 506 can only move horizontally in the inner wall of the brush 502, so that the short rod 506 moves to the short side of the trapezoidal block 507, and drives the corresponding square block 505 to move into the inner wall of the brush 502, in this state, the brush 502 can be disassembled and installed.

[0035] The working principle and use flow of the application are as follows: The driving roller 200 is connected with the flange plate of the rolling roller 600 through the connecting mechanism 300, the operator can move the sliding ring 302 to move the rubber blocks 304 on both sides to the two sides, then inserts the driving roller 200 into the connecting block 301, and the tooth block 309 is inserted into the tooth groove of the connecting block 301 and is in flexible contact with the rubber block 304; during rolling, the driving roller 200 drives the flange plate to rotate through the cooperation of the tooth block 309 and the connecting block 301, and then drives the rolling roller 600 to continuously work; the pressure of the tooth block 309 on the rubber block 304 is transmitted to the sliding rod 306 through the hinged rod 305 to make it move, and the rubber pad 307 is in frictional buffering with the inner wall of the groove 310 to reduce the collision force and protect the service life of the components.

[0036] The finished steel ball falls on the discharging plate A 402 of the discharging mechanism 400, the motor in the fixed block 401 drives the discharging plate A 402 to reciprocatingly turn up and down, and drives the steel ball to roll to the discharging plate B 403, when the discharging plate A 402 turns down, the discharging plate B 403 and the sliding block 405 move away from the direction of the housing 100 of the skew rolling machine, when the discharging plate A 402 turns up, the discharging plate B 403 and the sliding block 405 move reversely, and the folding baffle 404 at the connection of the discharging plate A 402 and the discharging plate B 403 folds or unfolds with the change of the angle to prevent the steel ball from falling from the gap; the steel ball falls into the cooling tank 700 through the discharging plate B 403, and since the discharging plate A 402 and the discharging plate B 403 turn dynamically, the steel ball is dispersed to different positions in the cooling tank 700, so that the accumulation is avoided and the uniform cooling is ensured.

[0037] The sliding block 405 drives the pushing mechanism 500 to move synchronously when moving, the brush 502 is in contact with the surface of the steel ball, and the brush 502 removes the impurities such as oxide scale and debris, breaks the surface steam film and oil film, and strengthens the heat dissipation effect, and at the same time, the brush 502 pushes the steel ball to slightly roll, so that the all-round cooling of each surface is ensured.

[0038] If the brush 502 needs to be replaced, the moving rod 503 is pressed to move the trapezoidal block 507, and the short rod 506 is pushed through the inclined surface to make the square block 505 compress the telescopic spring 504 and disengage from the square groove 508 of the mounting block 501, and the brush 502 can be removed; when installing, the moving rod 503 is also pressed to insert one end of the brush 502 into the mounting block 501, and the elastic force of the telescopic spring 504 is used to reset the square block 505 and snap it into the square groove 508 to complete the installation.

[0039] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0040] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A high-precision rolling process for hot-rolled wear-resistant steel balls, characterized by: The following steps are involved: S1. Select high carbon chromium steel, high manganese steel or carburizing steel according to the wear resistance requirements, ensure the carbon content is 1.0%-1.2%, and the chromium content is 10%-15%. Roll the steel ingot into round steel bars with the specified diameter, and cut them into short billets with a high-precision cutting machine. The billet end surface flatness is ≤0.1mm; S2. The billet is fed into a continuous heating furnace and sequentially undergoes low-temperature preheating, medium-temperature heating, and high-temperature austenitization. The heating rate is ≤10°C / s. Thermocouples are arranged in different zones in the furnace to ensure that the temperature difference of the billet is ≤±10°C. S3. Use a skew rolling mill for rolling. Optimize the pass curve through finite element simulation. Adjust the roll inclination to 3°-15°, control the roll gap tolerance to ±0.05mm, and rotate the rolls at 50-200r / min. Deformation in a single pass is ≤30%, and multiple passes are used for gradual forming. The rolling pressure is controlled by a servo system to ensure that the roundness error of the steel ball is ≤0.1mm and the diameter tolerance is ≤±0.05mm. S4. After rolling, the hot steel balls are directly put into the quenching tank for cooling. The cooling rate is ≥50℃ / s, ensuring that the surface to the core are transformed into martensite structure, with a surface hardness of HRC58-65. The quenching water temperature is ≤30℃, and the water filtration accuracy is ≤5μm. S5. After quenching, the steel balls are sent to the tempering furnace and kept at 200-300℃ for 1-2 hours to eliminate internal stress. After tempering, the hardness drops to ≤2HRC. The surface oxide scale is removed by shot blasting machine and the surface roughness is controlled at Ra≤1.6μm. S6. Laser diameter measuring instrument detects the diameter of each particle, roundness meter detects the sphericity, out-of-defect products are eliminated, random sampling is carried out for hardness testing, metallographic analysis, and non-destructive testing.

2. A high-precision rolling equipment for hot-rolled wear-resistant steel balls, applied to a high-precision rolling process for hot-rolled wear-resistant steel balls as claimed in claim 1, comprising a skew rolling mill housing (100) and a cooling trough (700), characterized in that: The inner wall of the cross-rolling mill housing (100) is provided with a rolling roller (600), and further comprises: a driving roller (200), the driving roller (200) being arranged on the outer wall of the roller (600) via a connecting mechanism (300); A blanking mechanism (400), the blanking mechanism (400) being arranged on the outer wall of the inclined rolling mill housing (100); a toggle mechanism (500), the toggle mechanism (500) being arranged outside the blanking mechanism (400); The connecting mechanism (300) comprises a connecting block (301), the outer wall of the connecting block (301) is slidably connected to a sliding ring (302), the outer wall of the sliding ring (302) is fixedly connected to a sliding rod (306), the outer wall of the sliding rod (306) is fixedly connected to a rubber pad (307), and the inner wall of the connecting block (301) is elastically connected to a rubber block (304) via a connecting spring (303).

3. The high-precision rolling equipment for hot-rolled wear-resistant steel balls according to claim 2, characterized in that: The connecting mechanism (300) further includes a tooth block (309), wherein the tooth block (309) is fixedly connected to the outer wall of the driving roller (200), the slide bar (306) is elastically connected to the inner wall of the connecting block (301) via a return spring (308), the rubber block (304) is hinged to the outer wall of the bottom end of the slide bar (306) via a hinge rod (305), and a groove (310) is provided on the inner wall of the connecting block (301).

4. The high-precision rolling equipment for hot-rolled wear-resistant steel balls according to claim 3, characterized in that: One end of the connecting spring (303) is fixedly connected to the outer wall of the rubber block (304), and the other end of the connecting spring (303) is fixedly connected to the inner wall of the connecting block (301). The rubber block (304) is slidably connected to the inner wall of the connecting block (301), and the rubber block (304) is in contact with the outer wall of the tooth block (309).

5. The high-precision rolling equipment for hot-rolled wear-resistant steel balls according to claim 3, characterized in that: One end of the return spring (308) is fixedly connected to the inner wall of the connecting block (301), and the other end of the return spring (308) is fixedly connected to the outer wall of the slide rod (306). The slide rod (306) is slidably connected to the inner wall of the connecting block (301). The two ends of the hinged rod (305) are hinged to the outer wall of the slide rod (306) and the rubber block (304) respectively, and the rubber pad (307) contacts the inner wall of the groove (310).

6. The high-precision rolling equipment for hot-rolled wear-resistant steel balls according to claim 2, characterized in that: The blanking mechanism (400) comprises a fixed block (401), the outer wall of the fixed block (401) is hinged with a blanking plate A (402), the outer wall of the blanking plate A (402) is hinged with a blanking plate B (403), the outer walls of the blanking plates A (402) and B (403) are fixedly connected with a folding baffle (404), and the outer wall of the bottom end of the blanking plate B (403) is hinged with a slider (405).

7. The high-precision rolling equipment for hot-rolled wear-resistant steel balls according to claim 6, characterized in that: The fixed block (401) is fixedly connected to the outer wall of the inclined rolling mill housing (100), and the sliding block (405) is slidably connected to the bottom inner wall of the cooling trough (700).

8. The high-precision rolling equipment for hot-rolled wear-resistant steel balls according to claim 2, characterized in that: The toggle mechanism (500) comprises a mounting block (501), the inner wall of the mounting block (501) is clamped with a brush (502), the inner wall of the brush (502) is slidably connected to a moving rod (503), the outer wall of the moving rod (503) is fixedly connected to a trapezoidal block (507), the inner wall of the brush (502) is elastically connected to a square block (505) via a telescopic spring (504), the inner wall of the brush (502) is slidably connected to a short rod (506), and the inner wall of the mounting block (501) is provided with a square groove (508).

9. The high-precision rolling equipment for hot-rolled wear-resistant steel balls according to claim 8, characterized in that: The mounting block (501) is fixedly connected to the outer wall of the slider (405), the trapezoidal block (507) is slidably connected to the inner wall of the brush (502), one end of the short rod (506) is slidably connected to the outer wall of the trapezoidal block (507), and the other end of the short rod (506) is fixedly connected to the outer wall of the square block (505).

10. The high-precision rolling equipment for hot-rolled wear-resistant steel balls according to claim 8, characterized in that: One end of the telescopic spring (504) is fixedly connected to the outer wall of the square block (505), and the other end of the telescopic spring (504) is fixedly connected to the inner wall of the brush (502). The square block (505) is slidably connected to the inner wall of the brush (502), and the square block (505) is engaged with the square groove (508).

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