High-precision assembly method for twenty-high roll mill backing bearing

Abstract

The invention discloses a twenty-high roll mill backing bearing high-precision assembling method, and relates to the technical field of bearing assembling. The method comprises the following steps: A, cleaning and checking the backing bearing; b, the wall thickness of the backing bearing is detected, wherein after the backing bearing to be assembled is cleaned and checked, the wall thickness of the backing bearing to be assembled is measured; c, assembling a backing bearing; and D, quality detection: after the bearing to be assembled is assembled, carrying out comprehensive quality inspection and performance test. In order to further improve the precision and efficiency of bearing assembly, an assembly workbench composed of an assembly platform, a bearing mandrel supporting frame, a bearing supporting and adjusting frame, a bearing wall thickness measuring device and a bearing lifting appliance is adopted to assemble the twenty-high roll mill backing bearing. The assembling method is high in assembling precision and efficiency, and the problems that an existing twenty-high roll mill backing bearing conventional assembling method is large in assembling difficulty, low in efficiency, low in assembling precision and the like can be effectively solved.

Description

Technical Field

[0001] The invention relates to the technical field of bearing assembly, in particular to an assembly method of a twenty-high rolling mill backing bearing. Background Art

[0002] As the core component of the twenty-high mill, the backing bearing is crucial to the load-bearing, transmission and overall performance of the mill. It is a precision mechanical component, and its service accuracy and life directly affect the operating efficiency of the mill. The backing bearing is composed of six two-row cylindrical roller bearings installed side by side on a mandrel, and the entire twenty-high mill is equipped with eight such backing bearings. The outer diameter of these bearings is directly in contact with the intermediate roll, and they rotate while bearing the load rolling force, so they have extremely high requirements for part accuracy. To ensure the best operating function, these bearings must be accurately grouped and matched during installation and use.

[0003] When grouping and matching, the backing bearings are arranged according to their wall thickness height. On each mandrel, the larger bearings are placed in the middle after assembly, and the smaller ones are placed on both sides, forming a gradually decreasing arrangement from the middle to the two ends, that is, a configuration of "high in the middle and low on both sides". In order to ensure the stability of rolling and the life of the bearings, the wall thickness error of adjacent backing bearings is strictly controlled within 0.002mm, and the error of the entire group of bearings does not exceed 0.006mm. If the error is too large, it will cause serious uneven force on the backing bearings on the support rollers, which will cause vibration and roller fatigue damage, which will not only reduce product quality, but also shorten the working life of the backing bearings.

[0004] However, the conventional assembly method currently used is not only difficult, but also difficult to achieve the required process accuracy. Therefore, it is particularly important to develop a new assembly method for the twenty-high mill backing bearing that can meet the high-precision requirements. Summary of the invention

[0005] The invention provides a high-precision assembly method for a twenty-high rolling mill backing bearing. The assembly method has high assembly precision and effectively solves the problem of low assembly precision in the existing conventional assembly method for the twenty-high rolling mill backing bearing.

[0006] In order to solve the above problems, the technical solution adopted by the present invention is: The following steps are involved: A. Cleaning and inspection of backing bearings: clean the rolling element raceway and surface impurities and dust of the backing bearings to be assembled, and check whether there are abnormal wear or defects on the rolling element and inner and outer ring surfaces of the backing bearings to be assembled; B. Backing bearing wall thickness detection: After the backing bearing to be assembled is cleaned and inspected, the wall thickness of the backing bearing to be assembled is measured; C. Assembly of backing bearings: After the wall thickness of all backing bearings to be assembled is measured, according to the size of the wall thickness, the backing bearings with larger wall thickness are placed in the middle of the mandrel and the backing bearings with smaller wall thickness are placed at both ends of the mandrel, so that the backing bearings mounted on the mandrel decrease in order from the middle to the two ends; when mounting the backing bearings on the mandrel, ensure that the marks on the inner rings of all backing bearings are in the same direction, and the marks on the inner rings are rotated 60 degrees relative to the shaft each time the inner rings are installed; D. Quality inspection: After the bearings are assembled, they are subjected to comprehensive quality inspection and performance testing.

[0007] In the above technical solution, a more specific technical solution may also be: in the above step A, the inspection items of the outer ring of the backing bearing to be assembled include: a. whether there are cracks or defects; b. whether there are sliding injuries and indentations; c. whether there is discoloration due to heat; d. whether there is rust; e. confirm whether the rolling traces of the rollers are tilted and whether there are large deviations in each row; f. whether there is any jamming on the rib surface; The inspection items for the inner ring of the backing bearing to be assembled include: a. confirming whether there are axial scratches in the track; b. confirming whether there is rust; c. confirming whether there is discoloration due to heat; d. confirming whether there is any jam on the rib surface; e. confirming whether the rolling traces of the rollers are tilted and whether there are large deviations in each row; The rolling element inspection items of the backing bearing to be assembled include: a. Whether there is any jamming; b. Whether there is any discoloration due to heat; c. Whether there is any crack or defect; d. Whether there is any rust.

[0008] Furthermore, an assembly workbench is used to assemble the backing bearing of the twenty-high rolling mill; wherein the assembly workbench includes an assembly platform and a bearing core shaft support frame installed on one side of the assembly platform, and the assembly platform is provided with a bearing support adjustment frame, a bearing wall thickness measuring device, and a bearing hanger.

[0009] Furthermore, the bearing support and adjustment frame includes a mounting base, a cushion block 1 is provided below the mounting base; two sets of symmetrically distributed support rods are hinged above the mounting base, a support seat for supporting the bearing is hinged at the top of the support rod, and a cushion block 2 is installed above the support seat.

[0010] Furthermore, the bearing hanger includes a lifting ear, the bottom of the lifting ear is hinged with a left support rod and a right support rod, the lower end of the left support rod is hinged with a left suspension rod, the lower end of the right support rod is hinged with a right suspension rod, the left suspension rod and the right suspension rod are cross-hinged, and the bottom ends of the left suspension rod and the right suspension rod are both connected with a clamping plate for clamping the bearing, and a pad is provided on the inner side of the clamping plate.

[0011] Furthermore, in the above step C, when the third backing bearing is mounted on the core shaft, the bearing adjustment bracket is used to support the backing bearing.

[0012] Further, the method for assembling the twenty-high mill backing bearing using the assembly workbench comprises the following steps: A. Cleaning and inspection of backing bearings: remove impurities and dust from the rolling element raceway and surface of the backing bearings to be assembled, and inspect whether there are abnormal wear or defects on the rolling elements and inner and outer ring surfaces of the backing bearings to be assembled: 1) Inspection items for the outer ring of the backing bearings to be assembled include: a. Whether there are cracks or defects; b. Whether there are sliding injuries and indentations; c. Whether there is discoloration due to heat; d. Whether there is rust; e. Confirm whether the rolling traces of the rollers are tilted and whether there are large deviations in each row; f. Whether there is jamming on the rib surface; 2) Inspection items for the inner ring of the backing bearings to be assembled include: a. Confirm whether there are axial scratches in the track; b. Whether there is rust; c. Whether there is discoloration due to heat; d. Whether there is jamming on the rib surface; e. Confirm whether the rolling traces of the rollers are tilted and whether there are large deviations in each row; 3) Inspection items for the rolling elements of the backing bearings to be assembled include: a. Whether there are jams; b. Whether there is discoloration due to heat; c. Whether there are cracks or defects; d. Whether there is rust; B. Backing bearing wall thickness detection: After the backing bearing to be assembled is cleaned and inspected, the wall thickness of the backing bearing to be assembled is measured using a bearing wall thickness measuring device; C. Assembly of backing bearings: After the wall thickness of all backing bearings to be assembled is measured, the mandrel is installed on the bearing mandrel support frame. According to the wall thickness value, the difference of the wall thickness values ​​of adjacent backing bearings is controlled within 0.002mm, and the difference of the wall thickness values ​​of all backing bearings on the same mandrel is controlled within 0.006mm. The backing bearings with large wall thickness values ​​are placed in the middle of the mandrel and the backing bearings with small wall thickness values ​​are placed at both ends of the mandrel. The mandrel is mounted with a bearing hanger, and the backing bearings mounted on the mandrel are arranged in descending order from the middle to the two ends; when the backing bearings are mounted on the mandrel, ensure that the marks of the inner rings of all backing bearings are in the same direction, and the marks of the inner rings are rotated 60 degrees relative to the shaft each time they are installed; D. Quality inspection: After the bearings are assembled, they are subjected to comprehensive quality inspection and performance testing.

[0013] Due to the adoption of the above technical solution, the present invention has the following beneficial effects compared with the prior art: 1. The present invention strictly controls each process to control the assembly error below 0.002 mm, thereby achieving high-precision assembly of the backing bearing.

[0014] 2. The present invention further improves the assembly accuracy and efficiency of the twenty-high mill backing bearing by adopting a proprietary equipment - an assembly workbench, that is, by using an assembly platform, a bearing core shaft support frame, a bearing support adjustment frame, a bearing wall thickness measuring device, and a bearing hanger, and shortens the assembly time from about 90 minutes to about 50 minutes, effectively solving the problems of the existing conventional assembly method of the twenty-high mill backing bearing, such as great assembly difficulty, low efficiency, and low assembly accuracy.

[0015] 3. The bearing support and adjustment frame on the assembly workbench of the present invention is hinged with symmetrically distributed support rods above the mounting base, and a support seat for holding the bearing is hinged at the top of the support rod, so that the bearing assembly being installed can be effectively supported, and the pressure on the support frame shaft pin and the core shaft can be dispersed and reduced, thereby solving the problem of the core shaft installed on the bearing core shaft support frame being deformed due to the gravity of the bearing assembly, thereby reducing the assembly accuracy of the backing bearing.

[0016] 4. The bearing hanger on the assembly workbench of the present invention has a reasonably designed hanger structure, including a lifting lug, a left support rod, a right support rod, a left hanger rod and a right hanger rod, as well as an articulation method therebetween, so that the hanger can not only easily adapt to bearings of different sizes and weights, but also can safely and accurately carry and install the bearings without damaging the bearing surface, thereby improving the handling and assembly efficiency of the backing bearing.

[0017] 5. The present invention not only has high assembly efficiency but also has high assembly precision, and effectively solves the problems of high assembly difficulty, low efficiency and low assembly precision in the conventional assembly method of the existing twenty-high rolling mill backing bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the assembly workbench of the present invention.

[0019] Figure 2 It is a structural schematic diagram of the bearing support adjustment frame of the present invention.

[0020] Figure 3 It is a structural schematic diagram of the bearing hanger of the present invention.

[0021] Figure 1-Figure 3 In the figure, number 1 is assembly platform, 2 is bearing spindle support frame, 3 is bearing support adjustment frame, 3-1 is mounting base, 3-2 is pad one, 3-3 is support rod, 3-4 is support seat, 3-5 is pad two, 4 is bearing wall thickness gauge, 5 is bearing hanger, 5-1 is lifting ear, 5-2 is left support rod, 5-3 is right support rod, 5-4 is left suspension rod, 5-5 is right suspension rod, 5-6 is clamping plate, 5-7 is pad. DETAILED DESCRIPTION

[0022] The present invention will be further described below in conjunction with the accompanying drawings and embodiments: Figure 1 What is shown is a schematic diagram of the structure of the assembly workbench used in the assembly of the present invention, wherein the assembly workbench includes an assembly platform 1 and a bearing core shaft support frame 2 installed on one side of the assembly platform 1, and the assembly platform 1 is provided with a bearing support adjustment frame 3, a bearing wall thickness measuring device 4, and a bearing hanger 5.

[0023] Figure 2 What is shown is a schematic diagram of the structure of the bearing support and adjustment frame 3 on the assembly workbench of the present invention, the bearing support and adjustment frame 3 includes a mounting base 3-1, and a cushion block 1 3-2 is provided below the mounting base 3-1; two sets of support rods 3-3 symmetrically distributed are hinged above the mounting base 3-1, and a support seat 3-4 for holding the bearing is hinged at the top of the support rod 3-3, and a cushion block 2 3-5 is installed above the support seat 3-4.

[0024] Figure 3 What is shown is a schematic diagram of the structure of the bearing hanger 5 on the assembly workbench of the present invention, the bearing hanger 5 includes a lifting ear 5-1, the bottom of the lifting ear 5-1 is hinged with a left support rod 5-2 and a right support rod 5-3, the lower end of the left support rod 5-2 is hinged with a left suspension rod 5-4, the lower end of the right support rod 5-3 is hinged with a right suspension rod 5-5, the left suspension rod 5-4 and the right suspension rod 5-5 are cross-hinged, the bottom ends of the left suspension rod 5-4 and the right suspension rod 5-5 are both connected with a clamping plate 5-6 for clamping the bearing, and a pad 5-7 is provided on the inner side of the clamping plate 5-6.

[0025] The bearing wall thickness measuring device 4 is provided with a horizontal axis for placing the bearing, a micrometer for measuring the bearing thickness, and a calibration gauge for calibration.

[0026] The method for assembling a twenty-high mill backing bearing using an assembly workbench comprises the following steps: A. Cleaning and inspection of backing bearings: remove impurities and dust from the rolling element raceway and surface of the backing bearings to be assembled, and inspect whether there are abnormal wear or defects on the rolling elements and inner and outer ring surfaces of the backing bearings to be assembled: 1) Inspection items for the outer ring of the backing bearings to be assembled include: a. Whether there are cracks or defects; b. Whether there are sliding injuries and indentations; c. Whether there is discoloration due to heat; d. Whether there is rust; e. Confirm whether the rolling traces of the rollers are tilted and whether there are large deviations in each row; f. Whether there is jamming on the rib surface; 2) Inspection items for the inner ring of the backing bearings to be assembled include: a. Confirm whether there are axial scratches in the track; b. Whether there is rust; c. Whether there is discoloration due to heat; d. Whether there is jamming on the rib surface; e. Confirm whether the rolling traces of the rollers are tilted and whether there are large deviations in each row; 3) Inspection items for the rolling elements of the backing bearings to be assembled include: a. Whether there are jams; b. Whether there is discoloration due to heat; c. Whether there are cracks or defects; d. Whether there is rust; B. Backing bearing wall thickness detection: After the backing bearing to be assembled is cleaned and inspected, the wall thickness of the backing bearing to be assembled is measured using a bearing wall thickness measuring device 4; C. Assembly of backing bearings: After the wall thickness of all backing bearings to be assembled is measured, the mandrel is installed on the bearing mandrel support frame 1. According to the size of the wall thickness, the difference in the wall thickness of adjacent backing bearings is controlled within 0.002mm, and the difference in the wall thickness of all backing bearings on the same mandrel is controlled within 0.006mm. In the order of placing the backing bearing with a large wall thickness in the middle of the mandrel and the backing bearing with a small wall thickness at both ends of the mandrel, the bearing hanger 5 is mounted on the mandrel, so that the backing bearings mounted on the mandrel decrease in sequence from the middle to the two ends; wherein, when mounting the backing bearing on the mandrel, ensure that the marks of the inner rings of all backing bearings are in the same direction, and each time the marks of the inner rings are installed, rotate 60 degrees relative to the shaft; and when the third backing bearing is mounted on the mandrel, start to use the bearing adjustment bracket 3 to support the backing bearing; D. Quality inspection: After the bearing is assembled, a comprehensive quality inspection and performance test is carried out, including but not limited to geometric dimension inspection, rotation accuracy test, vibration analysis, etc., to ensure that the assembly quality meets the design standards and actual use requirements, and corresponding markings and records are made to facilitate the later maintenance and management of the backing bearing.

[0027] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A high-precision assembly method for a twenty-high rolling mill backing bearing, characterized in that The following steps are involved: A. Cleaning and inspection of backing bearings: clean the rolling element raceway and surface impurities and dust of the backing bearings to be assembled, and check whether there are abnormal wear or defects on the rolling element and inner and outer ring surfaces of the backing bearings to be assembled; B. Backing bearing wall thickness detection: After the backing bearing to be assembled is cleaned and inspected, the wall thickness of the backing bearing to be assembled is measured; C. Assembly of backing bearings: After the wall thickness of all backing bearings to be assembled is measured, according to the size of the wall thickness, the backing bearings with larger wall thickness are placed in the middle of the mandrel and the backing bearings with smaller wall thickness are placed at both ends of the mandrel, so that the backing bearings mounted on the mandrel decrease in order from the middle to the two ends; when mounting the backing bearings on the mandrel, ensure that the marks on the inner rings of all backing bearings are in the same direction, and the marks on the inner rings are rotated 60 degrees relative to the shaft each time the inner rings are installed; D. Quality inspection: After the bearing is assembled, a comprehensive quality inspection and performance test will be carried out.

2. A high-precision assembly method for a twenty-high rolling mill backing bearing according to claim 1, characterized in that: In the above step A, the inspection items of the outer ring of the backing bearing to be assembled include: a. whether there are cracks or defects; b. whether there are sliding injuries and indentations; c. whether there is discoloration due to heat; d. whether there is rust; e. whether the rolling traces of the rollers are tilted and whether there are large deviations between the rows; f. whether there are any jams on the rib surface; The inspection items for the inner ring of the backing bearing to be assembled include: a. confirming whether there are axial scratches in the track; b. confirming whether there is rust; c. confirming whether there is discoloration due to heat; d. confirming whether there is any jam on the rib surface; e. confirming whether the rolling traces of the rollers are tilted and whether there are large deviations in each row; The rolling element inspection items of the backing bearing to be assembled include: a. Whether there is any jamming; b. Whether there is any discoloration due to heat; c. Whether there is any crack or defect; d. Whether there is any rust.

3. A high-precision assembly method for a twenty-high mill backing bearing according to claim 2, characterized in that: An assembly workbench is used to assemble the backing bearing of a twenty-high rolling mill; wherein the assembly workbench includes an assembly platform and a bearing spindle support frame installed on one side of the assembly platform, and the assembly platform is provided with a bearing support adjustment frame, a bearing wall thickness measuring device, and a bearing hanger.

4. A high-precision assembly method for a twenty-high mill backing bearing according to claim 3, characterized in that: The bearing support and adjustment frame includes a mounting base, a cushion block 1 is provided below the mounting base; two sets of symmetrically distributed support rods are hinged above the mounting base, a support seat for holding the bearing is hinged at the top of the support rod, and a cushion block 2 is installed above the support seat.

5. A high-precision assembly method for a twenty-high rolling mill backing bearing according to claim 4, characterized in that: The bearing hanger includes a lifting ear, the bottom of the lifting ear is hinged with a left support rod and a right support rod, the lower end of the left support rod is hinged with a left suspension rod, the lower end of the right support rod is hinged with a right suspension rod, the left suspension rod and the right suspension rod are cross-hinged, the bottom ends of the left suspension rod and the right suspension rod are connected with a clamping plate for clamping the bearing, and a pad is provided on the inner side of the clamping plate.

6. A high-precision assembly method for a twenty-high rolling mill backing bearing according to claim 5, characterized in that: In the above step C, when the third backing bearing is mounted on the core shaft, the bearing adjustment bracket is used to support the backing bearing.

7. A high-precision assembly method for a twenty-high mill backing bearing according to claim 6, characterized in that The method for assembling a twenty-high mill backing bearing using an assembly workbench comprises the following steps: A. Cleaning and inspection of backing bearings: remove impurities and dust from the rolling element raceway and surface of the backing bearings to be assembled, and inspect whether there are abnormal wear or defects on the rolling elements and inner and outer ring surfaces of the backing bearings to be assembled: 1) Inspection items for the outer ring of the backing bearings to be assembled include: a. Whether there are cracks or defects; b. Whether there are sliding injuries and indentations; c. Whether there is discoloration due to heat; d. Whether there is rust; e. Confirm whether the rolling traces of the rollers are tilted and whether there are large deviations in each row; f. Whether there is jamming on the rib surface; 2) Inspection items for the inner ring of the backing bearings to be assembled include: a. Confirm whether there are axial scratches in the track; b. Whether there is rust; c. Whether there is discoloration due to heat; d. Whether there is jamming on the rib surface; e. Confirm whether the rolling traces of the rollers are tilted and whether there are large deviations in each row; 3) Inspection items for the rolling elements of the backing bearings to be assembled include: a. Whether there are jams; b. Whether there is discoloration due to heat; c. Whether there are cracks or defects; d. Whether there is rust; B. Backing bearing wall thickness detection: After the backing bearing to be assembled is cleaned and inspected, the wall thickness of the backing bearing to be assembled is measured using a bearing wall thickness measuring device; C. Assembly of backing bearings: After the wall thickness of all backing bearings to be assembled is measured, the mandrel is installed on the bearing mandrel support frame. According to the wall thickness value, the difference of the wall thickness values ​​of adjacent backing bearings is controlled within 0.002mm, and the difference of the wall thickness values ​​of all backing bearings on the same mandrel is controlled within 0.006mm. The backing bearings with large wall thickness values ​​are placed in the middle of the mandrel and the backing bearings with small wall thickness values ​​are placed at both ends of the mandrel. The mandrel is mounted with a bearing hanger, and the backing bearings mounted on the mandrel are arranged in descending order from the middle to the two ends; when the backing bearings are mounted on the mandrel, ensure that the marks of the inner rings of all backing bearings are in the same direction, and the marks of the inner rings are rotated 60 degrees relative to the shaft each time they are installed; D. Quality inspection: After the bearings are assembled, they are subjected to comprehensive quality inspection and performance testing.

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