Axial locking and adjusting process for roller in bar rolling process

Abstract

The invention relates to the technical field of bar rolling, and discloses a roller axial locking and adjusting process in the bar rolling process, which comprises the steps of S1, pretreatment and parameter calibration before roller assembly, S2, roller axial locking device installation and pre-tightening, S3, axial dynamic monitoring and adjusting in the rolling process, and S4, axial resetting and checking during groove changing and roller changing. According to the process, the assembly precision is improved, the initial movement is reduced, through strict cleaning detection (the fit clearance is smaller than or equal to 0.03 mm, and the surface roughness is smaller than or equal to Ra 0.8 micron) and axial locking assembly coaxiality verification (the error is smaller than or equal to 0.02 mm / m), the fit precision of a roller, a bearing seat and a locking device is ensured, and the hidden danger of axial movement is reduced from the source; initial axial positioning parameters are set according to steel type differentiation (the dislocation of round steel is smaller than or equal to 0.1 mm, and the dislocation of square steel is smaller than or equal to 0.08 mm), and a foundation is laid for subsequent rolling precision.

Description

Technical Field

[0001] This invention relates to the field of bar rolling technology, specifically to the process of axial locking and adjustment of rolls during bar rolling. Background Technology

[0002] In bar rolling production, the axial positioning accuracy of the rolls directly affects the dimensional accuracy and surface quality of the rolled product. Traditional roll axial locking and adjustment processes have the following shortcomings: Insufficient assembly precision: The cleanliness and clearance control of the roll journal and bearing housing are not strict. Oil stains and iron oxide scale residue often cause the clearance to exceed the tolerance (more than 0.05mm), which in turn causes the roll to move axially. The axial locking assembly is not checked for coaxiality during pre-assembly, which can easily lead to the locking ring and the positioning sleeve being misaligned, resulting in uneven distribution of locking force.

[0003] The locking and pre-tightening method is crude: the bolts are pre-tightened in one go without graded pre-tightening and static stabilization. The subsequent locking force is easily weakened due to the release of bolt stress, which causes the roll to loosen axially during the rolling process (the amount of movement exceeds 0.03mm), affecting the alignment accuracy of the rolling groove.

[0004] Lack of dynamic monitoring: There is a lack of real-time axial displacement monitoring during the rolling process. Relying solely on manual periodic inspections, it is impossible to detect slight movement (0.05-0.1mm) in time. Adjustments are often only made after the rolled piece has exceeded the dimensional tolerance, resulting in an increased scrap rate.

[0005] Large error in resetting the groove or roll: When changing grooves or rolls, if a precise axial positioning reference is not established and the groove is aligned only by experience, the axial misalignment between the new groove and the reference groove is likely to exceed 0.1mm, resulting in defects such as single-sided ears and dimensional deviations in the rolled piece. Summary of the Invention

[0006] (a) Technical problems to be solved To address the shortcomings of existing technologies, this invention provides a process for axial locking and adjustment of rolls during bar rolling, which has advantages such as insufficient assembly accuracy and solves problems such as improving assembly accuracy and reducing initial movement.

[0007] (II) Technical Solution To achieve the above-mentioned goals of improving assembly accuracy and reducing initial movement, the present invention provides the following technical solution: the axial locking and adjustment process of the rolls during bar rolling includes S1 pre-treatment and parameter calibration before roll assembly, S2 installation and pre-tightening of the axial locking device, S3 axial dynamic monitoring and adjustment during rolling, and S4 axial reset and verification during slot and roll changes. The S1 pre-treatment and parameter calibration before roll assembly includes S101 cleaning and inspection of the roll journal and bearing seat, S102 pre-assembly verification of the axial locking assembly, and S103 setting of initial axial positioning parameters. Among them, the installation and pre-tightening of the S2 roll axial locking device includes the alignment installation of the bearing housing and the roll in S201, the graded pre-tightening locking bolts in S202, and the axial clearance detection after pre-tightening in S203. Among them, the axial dynamic monitoring and adjustment during the S3 rolling process includes S301 real-time axial displacement monitoring, S302 online fine-tuning mechanism and S303 emergency locking reinforcement; Among them, the axial reset and verification during S4 slot change and roll change includes S401 axial positioning mark before slot change, S402 axial alignment adjustment of the new slot, and S403 comprehensive verification after roll change.

[0008] Preferably, the S101 roll journal and bearing housing cleaning inspection involves: using a special cleaning agent to remove oil stains and iron oxide scale from the contact surfaces of the roll journal, bearing housing inner hole, and axial locking device; using a precision feeler gauge to check the clearance between the journal and bearing housing to ensure that the clearance is ≤0.03mm; if local wear causes the clearance to exceed the tolerance, the bearing housing inner hole needs to be ground and repaired, and the surface roughness after repair needs to be ≤Ra0.8μm.

[0009] Preferably, the pre-assembly verification of the S102 axial locking assembly involves pre-assembling the positioning sleeve and locking ring assembly of the axial locking device, measuring the coaxiality of the locking ring and positioning sleeve using a dial indicator, and ensuring the error is within 0.02 mm / m; rotating the locking bolt to check the smoothness of the threaded pair fit, ensuring there is no jamming, and that the bolt rotation torque is uniform (torque fluctuation range ≤ 5 N·m).

[0010] Preferably, the initial axial positioning parameter setting of S103 is as follows: the axial positioning reference value of the roll is preset according to the rolling specification (diameter 20-100mm). For round steel rolling, the axial misalignment of the upper and lower roll grooves is ≤0.1mm; for square steel rolling, the misalignment is ≤0.08mm. The positioning parameters are entered into the rolling mill control system as the reference value for subsequent adjustment.

[0011] Preferably, the alignment and installation of the S201 bearing housing and the roll is as follows: the roll is hoisted into the bearing housing and positioned by the guide key on the side of the bearing housing to ensure that the perpendicularity between the roll axis and the bearing housing reference surface is ≤0.01mm / m; the axial thrust bearing is installed to ensure that the outer ring of the bearing fits tightly with the stepped surface of the bearing housing, and a 0.02mm feeler gauge is used to check that it cannot be inserted.

[0012] Preferably, the S202 graded pre-tightening locking bolt is pre-tightened in stages using a torque wrench. The first stage is pre-tightened to 50% of the rated torque (the rated torque is set to 300-500 N·m according to the bolt specifications). After standing for 10 minutes, the second stage is pre-tightened to 80% of the rated torque. After standing for another 5 minutes, the bolt is finally pre-tightened to the rated torque, ensuring that the locking ring fits evenly against the roll shoulder with a contact area ≥90%.

[0013] Preferably, the axial clearance detection after pre-tightening in S203 is as follows: the axial movement of the roll is detected using an axial dial indicator. When an axial force of 500N is applied, the movement is ≤0.01mm. If it exceeds the standard, the assembly status of the locking assembly needs to be re-checked, and the locking ring deformation and thread jamming problems are eliminated before pre-tightening again.

[0014] Preferably, the S301 real-time axial displacement monitoring involves installing non-contact laser displacement sensors on the operating and transmission sides of the rolling mill to monitor the axial position of the rolls in real time. The sampling frequency is 100Hz, and the data is transmitted to the control system. When an axial displacement ≥ 0.05mm is detected, the system automatically issues an early warning, prompting for adjustment. S302 Online Fine-Tuning Mechanism: For rolls exhibiting slight axial movement (0.05-0.1mm), the axial locking bolts are driven by an electric fine-tuning device, with each adjustment ≤0.02mm. After adjustment, the roll is allowed to stand for 3 seconds before the next adjustment is made, until the displacement returns to ≤0.03mm. During the adjustment process, the rolling force is monitored simultaneously to ensure that the rolling force fluctuation is ≤5%. S303 Emergency Locking and Reinforcement: When the axial displacement suddenly exceeds 0.1mm or continues to increase after adjustment, the emergency locking procedure is immediately activated. An additional axial force (1.2 times the rated preload) is applied through the hydraulic auxiliary locking cylinder. At the same time, the mill speed is reduced to 80% of the normal speed to avoid workpiece dimensional deviations or equipment damage.

[0015] Preferably, the axial positioning mark before the S401 slot change is as follows: before the slot change, the current axial position of the roll is recorded by a laser displacement sensor as a reference point, and a mechanical mark is made at the end of the roll; when disassembling the locking device, a special tooling is used to fix the roll to prevent axial movement of more than 1mm. Axial alignment adjustment of the new S402 rolling groove: After installing the new rolling groove, drive the roll axially through the manual fine-tuning mechanism, and observe the alignment of the rolling groove with the optical alignment instrument to ensure that the axial misalignment between the new rolling groove and the reference rolling groove is ≤0.05mm; after the adjustment is completed, tighten the bolts again according to the pre-tightening process.

[0016] Preferably, the comprehensive verification after the S403 roll change is as follows: After the roll change assembly is completed, a no-load test run is performed (the speed is 30% of the normal speed), and the axial displacement is continuously monitored for 30 minutes. The maximum displacement is ≤0.02mm. At the same time, the radial runout of the roll is detected to ensure that it is ≤0.03mm, so as to avoid vibration and abnormal noise caused by poor axial locking.

[0017] (III) Beneficial Effects Compared with the prior art, the present invention provides a process for axial locking and adjustment of rolls during bar rolling, which has the following beneficial effects: 1. The axial locking and adjustment process of the rolls during the bar rolling process improves assembly accuracy and reduces initial movement. Through strict cleaning inspection (fitting clearance ≤ 0.03mm, surface roughness ≤ Ra0.8μm) and coaxiality verification of the axial locking components (error ≤ 0.02mm / m), the fitting accuracy of the rolls, bearing seats, and locking devices is ensured, reducing the potential for axial movement from the source. The initial axial positioning parameters are set differently according to the steel type (round steel misalignment ≤ 0.1mm, square steel ≤ 0.08mm), laying the foundation for subsequent rolling accuracy.

[0018] 2. The axial locking and adjustment process of the rolls during the bar rolling process optimizes locking stability and reduces the risk of loosening. It adopts graded pre-tightening (50%→80%→100% of rated torque) combined with static stabilization to ensure uniform stress release of the locking bolts. The contact area between the locking ring and the roll shoulder is ≥90%, effectively avoiding the attenuation of locking force during rolling. After pre-tightening, the axial movement is controlled within 0.01mm (when a 500N axial force is applied), significantly improving the axial stability of the rolls.

[0019] 3. The axial locking and adjustment process of the rolls during the bar rolling process enables real-time monitoring and adjustment to ensure rolling accuracy. A 100Hz high-frequency laser displacement sensor monitors the axial displacement in real time, and an automatic warning is issued when the displacement is ≥0.05mm. Combined with an electric fine-tuning device, precise adjustment is achieved (each adjustment ≤0.02mm), ensuring that the axial displacement remains stable at ≤0.03mm during the rolling process. In case of emergency, a hydraulic auxiliary locking cylinder applies 1.2 times the rated preload, which, together with speed reduction protection, can prevent batch quality accidents caused by sudden movement.

[0020] 4. The axial locking and adjustment process of the rolls during the bar rolling process standardizes the slot and roll changing process, reduces reset errors, establishes a benchmark before slot changing using laser displacement sensors and mechanical marks, and uses an optical alignment instrument after slot changing to ensure that the axial misalignment of the new slot is ≤0.05mm; after roll changing, no-load test run monitoring (maximum displacement ≤0.02mm within 30 minutes) effectively reduces the debugging time and scrap rate after slot and roll changing, and improves production continuity.

[0021] 5. The axial locking and adjustment process of the rolls during the bar rolling process extends the equipment life and reduces production costs. By precisely controlling the axial locking force and displacement, uneven wear of the rolls and bearings is reduced, extending the roll service life by 10%-15%. At the same time, due to the improvement of dimensional accuracy, the scrap rate of rolled products is reduced by 8%-12%, significantly reducing production costs. Detailed Implementation

[0022] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0023] This solution provides a technical approach, specifically a process for axial locking and adjustment of rolls during bar rolling, including the following steps: Pre-treatment and parameter calibration of S1 rolls before assembly: S101 Roll journal and bearing housing cleaning and inspection: Use a special cleaning agent to remove oil and iron oxide scale from the roller journal, bearing housing inner hole and axial locking device contact surface. Use a precision feeler gauge to check the clearance between the journal and bearing housing to ensure that the clearance is ≤0.03mm. If there is local wear causing the clearance to exceed the tolerance, the bearing housing inner hole needs to be ground and repaired. After repair, the surface roughness must be ≤Ra0.8μm. S102 Axial Locking Assembly Pre-assembly Verification: Pre-assemble the positioning sleeve and locking ring assembly of the axial locking device. Measure the coaxiality of the locking ring and positioning sleeve using a dial indicator. The error must be controlled within 0.02mm / m. Rotate the locking bolt to check the smoothness of the threaded pair, ensuring there is no jamming and that the bolt rotation torque is uniform (torque fluctuation range ≤5N・m). S103 Initial Axial Positioning Parameter Setting: Based on the rolling specifications (diameter 20-100mm), preset the axial positioning reference value of the rolls. For round steel rolling, the axial misalignment of the upper and lower roll grooves is ≤0.1mm; for square steel rolling, the misalignment is ≤0.08mm. The positioning parameters are entered into the rolling mill control system as the reference value for subsequent adjustments. Installation and pre-tightening of S2 roll axial locking device: S201 Bearing Housing and Roll Alignment and Installation: Hoist the roll into the bearing housing and position it using the guide key on the side of the bearing housing to ensure that the perpendicularity of the roll axis to the bearing housing reference surface is ≤0.01mm / m; Install the axial thrust bearing, ensuring that the outer ring of the bearing fits tightly against the stepped surface of the bearing housing, and check with a 0.02mm feeler gauge that it should not be inserted. S202 graded pre-tightening locking bolts: The axial locking bolts are pre-tightened in stages using a torque wrench. The first stage is pre-tightened to 50% of the rated torque (the rated torque is set to 300-500 N·m according to the bolt specifications). After standing for 10 minutes, the second stage is pre-tightened to 80% of the rated torque. After standing for another 5 minutes, the bolts are finally pre-tightened to the rated torque to ensure that the locking ring fits evenly against the roll shoulder with a contact area ≥90%. S203 Axial clearance test after pre-tightening: Use an axial dial indicator to test the axial movement of the roll. When a 500N axial force is applied, the movement should be ≤0.01mm. If it exceeds the standard, the assembly status of the locking assembly should be checked again. After eliminating problems such as locking ring deformation and thread jamming, pre-tighten again. Axial dynamic monitoring and adjustment during S3 rolling process: S301 Real-time Axial Displacement Monitoring: Non-contact laser displacement sensors are installed on the operating and transmission sides of the rolling mill to monitor the axial position of the rolls in real time. The sampling frequency is 100Hz, and the data is transmitted to the control system. When the axial displacement is detected to be ≥0.05mm, the system automatically issues an early warning and prompts for adjustment. S302 Online Fine-Tuning Mechanism: For rolls exhibiting slight axial movement (0.05-0.1mm), the axial locking bolts are driven by an electric fine-tuning device, with each adjustment ≤0.02mm. After adjustment, the roll is allowed to stand for 3 seconds before the next adjustment is made, until the displacement returns to ≤0.03mm. During the adjustment process, the rolling force is monitored simultaneously to ensure that the rolling force fluctuation is ≤5%. S303 Emergency Locking and Reinforcement: When the axial displacement suddenly exceeds 0.1mm or continues to increase after adjustment, the emergency locking procedure is immediately activated. An additional axial force (1.2 times the rated preload) is applied through the hydraulic auxiliary locking cylinder. At the same time, the mill speed is reduced to 80% of the normal speed to avoid workpiece dimensional deviation or equipment damage. Axial reset and verification during S4 groove and roller changes: S401 Axial positioning mark before changing slot: Before changing slot, the current axial position of the roll is recorded by a laser displacement sensor as a reference point, and a mechanical mark is made at the end of the roll; when disassembling the locking device, a special tooling is used to fix the roll to prevent axial movement of more than 1mm; Axial alignment adjustment of the new S402 mill groove: After installing the new mill groove, drive the roll axially through the manual fine-tuning mechanism, and observe the mill groove alignment with the optical alignment instrument to ensure that the axial misalignment between the new mill groove and the reference mill groove is ≤0.05mm; after the adjustment is completed, tighten the bolts again according to the pre-tightening procedure. Comprehensive verification after S403 roll replacement: After the roll replacement assembly is completed, a no-load test run is performed (speed is 30% of the normal speed), and the axial displacement is continuously monitored for 30 minutes. The maximum displacement is ≤0.02mm. At the same time, the radial runout of the roll is checked to ensure that it is ≤0.03mm, so as to avoid vibration and abnormal noise caused by poor axial locking. Furthermore, this process improves assembly accuracy and reduces initial axial movement. Through rigorous cleaning inspections (fitting clearance ≤ 0.03 mm, surface roughness ≤ Ra 0.8 μm) and coaxiality verification of the axial locking assembly (error ≤ 0.02 mm / m), the fitting accuracy between the rolls and bearing housings and locking devices is ensured, reducing the potential for axial movement from the source. Initial axial positioning parameters are set differently according to steel type (round steel misalignment ≤ 0.1 mm, square steel ≤ 0.08 mm), laying the foundation for subsequent rolling accuracy. Furthermore, this process optimizes locking stability and reduces the risk of loosening. By employing graded pre-tightening (50%→80%→100% of rated torque) combined with static stabilization, the stress on the locking bolts is released evenly, and the contact area between the locking ring and the roll shoulder is ≥90%, effectively preventing the locking force from weakening during rolling. After pre-tightening, the axial movement is controlled within 0.01mm (when a 500N axial force is applied), significantly improving the axial stability of the roll. Furthermore, this process enables real-time monitoring and adjustment to ensure rolling accuracy. A 100Hz high-frequency laser displacement sensor monitors axial displacement in real time, and automatically issues an early warning when the displacement is ≥0.05mm. Combined with an electric fine-tuning device, precise adjustments are made (≤0.02mm each time), ensuring that the axial displacement remains stable at ≤0.03mm during the rolling process. In emergencies, a hydraulically assisted locking cylinder applies 1.2 times the rated preload, which, together with speed reduction protection, can prevent batch quality accidents caused by sudden movement. Furthermore, this process standardizes the slot and roll changing process, reduces reset errors, establishes a benchmark before slot changing using laser displacement sensors and mechanical markings, and uses an optical alignment instrument after slot changing to ensure that the axial misalignment of the new slot is ≤0.05mm; after roll changing, no-load test run monitoring (maximum displacement ≤0.02mm within 30 minutes) effectively reduces the debugging time and scrap rate after slot and roll changing, and improves production continuity. Furthermore, this process extends equipment life and reduces production costs. By precisely controlling axial locking force and displacement, it reduces uneven wear on rolls and bearings, extending roll life by 10%-15%. At the same time, due to improved dimensional accuracy, the scrap rate of rolled products is reduced by 8%-12%, significantly reducing production costs.

[0024] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. The process of axial locking and adjustment of rolls during bar rolling, including S1 pretreatment and parameter calibration before roll assembly, S2 installation and pre-tightening of the axial locking device, S3 axial dynamic monitoring and adjustment during rolling, and S4 axial reset and verification during groove and roll changes, characterized in that: The pre-processing and parameter calibration before the assembly of the S1 roll includes S101 cleaning and inspection of the roll journal and bearing housing, S102 pre-assembly verification of the axial locking assembly, and S103 setting of the initial axial positioning parameters. Among them, the installation and pre-tightening of the S2 roll axial locking device includes the alignment installation of the bearing housing and the roll in S201, the graded pre-tightening locking bolts in S202, and the axial clearance detection after pre-tightening in S203. Among them, the axial dynamic monitoring and adjustment during the S3 rolling process includes S301 real-time axial displacement monitoring, S302 online fine-tuning mechanism and S303 emergency locking reinforcement; Among them, the axial reset and verification during S4 slot change and roll change includes S401 axial positioning mark before slot change, S402 axial alignment adjustment of the new slot, and S403 comprehensive verification after roll change.

2. The process for axial locking and adjustment of rolls during bar rolling according to claim 1, characterized in that: The cleaning and inspection of the S101 roll journal and bearing housing: Use a special cleaning agent to remove oil stains and iron oxide scale from the contact surfaces of the roll journal, bearing housing inner hole and axial locking device. Use a precision feeler gauge to check the fit clearance between the journal and bearing housing to ensure that the clearance is ≤0.03mm. If there is local wear that causes the clearance to exceed the tolerance, the bearing housing inner hole needs to be ground and repaired. After repair, the surface roughness must be ≤Ra0.8μm.

3. The process for axial locking and adjustment of rolls during bar rolling according to claim 1, characterized in that: The pre-assembly verification of the S102 axial locking assembly: pre-assemble the positioning sleeve and locking ring assembly of the axial locking device, measure the coaxiality of the locking ring and positioning sleeve with a dial indicator, and the error should be controlled within 0.02mm / m; rotate the locking bolt to check the smoothness of the thread pair fit, ensure that there is no jamming, and that the bolt rotation torque is uniform (torque fluctuation range ≤5N・m).

4. The process for axial locking and adjustment of rolls during bar rolling according to claim 1, characterized in that: The initial axial positioning parameter setting of S103 is as follows: the axial positioning reference value of the roll is preset according to the rolling specification (diameter 20-100mm). For round steel rolling, the axial misalignment of the upper and lower roll grooves is ≤0.1mm; for square steel rolling, the misalignment is ≤0.08mm. The positioning parameters are entered into the rolling mill control system as the reference value for subsequent adjustments.

5. The process for axial locking and adjustment of rolls during bar rolling according to claim 1, characterized in that: The alignment and installation of the S201 bearing housing and the roll: hoist the roll into the bearing housing, and position it using the guide key on the side of the bearing housing to ensure that the perpendicularity between the roll axis and the bearing housing reference surface is ≤0.01mm / m; install the axial thrust bearing, ensuring that the outer ring of the bearing fits tightly against the stepped surface of the bearing housing, and check with a 0.02mm feeler gauge that it should not be inserted.

6. The process for axial locking and adjustment of rolls during bar rolling according to claim 1, characterized in that: The S202 graded pre-tightening locking bolt: The axial locking bolt is pre-tightened in stages using a torque wrench. The first stage is pre-tightened to 50% of the rated torque (the rated torque is set to 300-500 N·m according to the bolt specifications). After standing for 10 minutes, the second stage is pre-tightened to 80% of the rated torque. After standing for another 5 minutes, the bolt is finally pre-tightened to the rated torque to ensure that the locking ring is evenly attached to the roll shoulder with a contact area ≥90%.

7. The process for axial locking and adjustment of rolls during bar rolling according to claim 1, characterized in that: The S203 pre-tightening axial clearance detection: Use an axial dial indicator to detect the axial movement of the roll. When a 500N axial force is applied, the movement should be ≤0.01mm. If it exceeds the standard, the assembly status of the locking assembly needs to be checked again. After eliminating problems such as locking ring deformation and thread jamming, the pre-tightening should be repeated.

8. The process for axial locking and adjustment of rolls during bar rolling according to claim 1, characterized in that: The S301 real-time axial displacement monitoring system involves installing non-contact laser displacement sensors on the operating and transmission sides of the rolling mill to monitor the axial position of the rolls in real time. The sampling frequency is 100Hz, and the data is transmitted to the control system. When an axial displacement ≥0.05mm is detected, the system automatically issues an early warning, prompting adjustments to be made. S302 Online Fine-Tuning Mechanism: For rolls exhibiting slight axial movement (0.05-0.1mm), the axial locking bolts are driven by an electric fine-tuning device, with each adjustment ≤0.02mm. After adjustment, the roll is allowed to stand for 3 seconds before the next adjustment is made, until the displacement returns to ≤0.03mm. During the adjustment process, the rolling force is monitored simultaneously to ensure that the rolling force fluctuation is ≤5%. S303 Emergency Locking and Reinforcement: When the axial displacement suddenly exceeds 0.1mm or continues to increase after adjustment, the emergency locking procedure is immediately activated. An additional axial force (1.2 times the rated preload) is applied through the hydraulic auxiliary locking cylinder. At the same time, the mill speed is reduced to 80% of the normal speed to avoid workpiece dimensional deviations or equipment damage.

9. The process for axial locking and adjustment of rolls during bar rolling according to claim 1, characterized in that: The axial positioning mark before the S401 slot change: Before the slot change, the current axial position of the roll is recorded by a laser displacement sensor as a reference point, and a mechanical mark is made at the end of the roll; when disassembling the locking device, a special tooling is used to fix the roll to prevent axial movement of more than 1mm. Axial alignment adjustment of the new S402 rolling groove: After installing the new rolling groove, drive the roll axially through the manual fine-tuning mechanism, and observe the alignment of the rolling groove with the optical alignment instrument to ensure that the axial misalignment between the new rolling groove and the reference rolling groove is ≤0.05mm; after the adjustment is completed, tighten the bolts again according to the pre-tightening process.

10. The process for axial locking and adjustment of rolls during bar rolling according to claim 1, characterized in that: The comprehensive verification after the S403 roll change is as follows: After the roll change assembly is completed, a no-load test run is performed (the speed is 30% of the normal speed), and the axial displacement is continuously monitored for 30 minutes. The maximum displacement is ≤0.02mm. At the same time, the radial runout of the roll is detected to ensure that it is ≤0.03mm, so as to avoid vibration and abnormal noise caused by poor axial locking.