Method for installing mill bottom plate of six-stand tandem cold rolling mill

Abstract

A kind of six rack cold continuous rolling mill set rolling mill base installation construction method belongs to six rack cold continuous rolling mill technical field.It is applicable to the construction of six rack cold continuous rolling mill set rolling mill base installation with great construction technical difficulty and high installation precision.Process steps include: measurement of defence line, base seat slurry, installation of rolling mill base, alignment of rolling mill base elevation, alignment of rolling mill base position, alignment of rolling mill base levelness, alignment of verticality of rolling mill base relative to auxiliary rolling center line, displacement and repositioning of rolling mill movable base.Advantages are that installation errors are eliminated, it is simple and easy to operate, construction period is short, construction cost is low, and installation precision is high.

Description

Technical Field

[0001] This invention belongs to the technical field of six-stand cold rolling mills, and specifically relates to a construction method for installing the bottom plate of a six-stand cold rolling mill unit. It is applicable to the construction of the bottom plate of a six-stand cold rolling mill unit with high technical difficulty and high installation accuracy requirements. Background Technology

[0002] The six-stand continuous rolling mill for electrical steel in new energy vehicles is the world's most advanced cold continuous rolling mill and the world's first six-stand cold continuous rolling production line. Compared with other cold continuous rolling mills, it has finer roll diameters, produces thinner rolled products, has higher rolling speeds, a higher degree of automation, and more production modes. It also places higher demands on installation precision, especially on the mill base plate. The overall levelness requirement is no greater than 0.05 / 1000, the perpendicularity error between a single mill and the rolling line is no greater than 0.1 / 1000, and the cumulative perpendicularity error between the six mills and the rolling line is no greater than 0.15 / 1000. Therefore, the installation of the mill base plate for the six-stand cold continuous rolling mill has a long construction period, requires a large investment of manpower, and has high construction costs. Summary of the Invention

[0003] The purpose of this invention is to provide a method for installing the base plate of a six-stand cold rolling mill. This method solves the problems of long installation time, high manpower requirements, and high construction costs associated with the installation of the base plate of a six-stand cold rolling mill. This invention provides a time guarantee for the smooth progress of the project, significantly reduces construction costs, shortens the construction period, and ensures installation accuracy.

[0004] To maximize installation accuracy and reduce construction costs while ensuring safety, quality, and timely completion, this invention employs a construction method for the base plate installation of a six-stand cold rolling mill. The mill centerline is set using a long-line control method for the short-line installation. The base plate leveling is achieved using a straightedge paired with a frame level with an accuracy of 0.02 / 1000. The perpendicularity of the base plate to the rolling line is aligned using a swing-arm method. This method fully utilizes the existing construction environment, overcomes technical challenges, and completes the installation and alignment of a single mill base plate in just 5 days, 5 days ahead of schedule. For all six mills, this saves a total of 30 days. The acceptance accuracy far exceeds the design error limits, resolving various technical difficulties in the installation of the base plate of a six-stand cold rolling mill.

[0005] The specific construction steps to solve the above technical problems are as follows:

[0006] 1. Measurement and layout

[0007] The rational layout of the measurement network, the objective accuracy of the measurement, and the accuracy of the measuring instruments all play a decisive role in the installation accuracy. For ease of construction, an auxiliary elevation point 1, an auxiliary rolling mill center line 2, and six auxiliary rolling mill center lines 3 perpendicular to the auxiliary rolling mill center line 2 are set at -3.445m; a permanent elevation point 4, a permanent rolling mill center line 5, and six permanent rolling mill center lines 6 perpendicular to the permanent rolling mill center line 5 are set at ±0.0m. Auxiliary rolling mill center lines 2, 3, 5, and 6 are all established using a Swiss Leica TDA5005 total station. The auxiliary rolling mill center lines 2 and 3 are then checked using a steel wire and plumb line suspended above the long-distance permanent rolling mill center lines 5 and 6; there should be no deviation between them.

[0008] 2. Foundation grouting

[0009] Because the installation accuracy requirements of the grout pad assembly 8 for the mill base plate 7 foundation are high, extended expansion bolts 11 are used to adjust the grout pad assembly 8 to facilitate leveling. One expansion bolt is welded to each of the four corners of the flat shim 9 along its width. For each square washer 10, an M12x240 extended expansion bolt 11 is installed directly below it, based on the actual position of the square washer 10 after the flat shims 9 are installed. The flat shims 9 are then installed on the extended expansion bolts 11. The shim group 8 is then fine-tuned and aligned using the M12 nuts 12 of the extended expansion bolts 11. When aligning the shim group 8, the uppermost inclined shim 13, which contacts the equipment, should be used as the reference. A 0.05mm feeler gauge should be used to check for gaps between the shims. Finally, each set of flat shims 9 is supported and grouted.

[0010] 3. Installation of rolling mill base plate 7

[0011] After the grouting layer on the flat shim 9 has reached its strength, use an oxy-acetylene torch or a cutting tool to remove the sealing cap on the anchor bolt sleeve 14 and thoroughly clean the dust and water inside the sleeve 14. Place the hammer-shaped anchor bolt 15 into the sleeve 14 and cover it with a t=50mm thick sponge sealing ring to prevent grout from flowing into the sleeve 14 during the secondary grouting of the mill base plate 7. Set up the shim sets 8, and measure and calibrate the elevation of the four sets of shim sets 8 at the four corners of the foundation base plate 7 to the design dimensions. The elevation of the remaining shim sets 8 should be 0.2mm lower than the design elevation. Hoist the inlet and outlet mill base plate 7 onto the shim sets 8. Install M64 thick washers 16 and M64 nuts 17 on the M64 anchor bolts 15, and install the pre-compression chamber 18, M110 thick washers 19 and M110 nuts 20 on the M110 anchor bolts 15 to replace the mill archway.

[0012] 4. Alignment of the rolling mill base plate at elevation 7

[0013] The alignment of the mill base plate 7 elevation was directly measured and aligned using a Trimble electronic digital display level. With the auxiliary elevation point 1 as the reference, the alignment was first roughed out without tightening the anchor bolts 15, and then the shim set 8 was compacted and the anchor bolts 15 were tightened before fine alignment.

[0014] 5. Alignment of position 7 on the rolling mill base plate

[0015] Draw a rolling center wire 21 on the auxiliary rolling center line 2. Suspend two first plumb bobs 22 above the single mill base plate 7. The distance between the first plumb bobs 22 and the edge of the mill base plate 7 should not exceed the edge of the mill base plate 7. Adjust the mill base plate 7 so that the projection of the center point of the two first plumb bobs 22 is exactly on the center line 23 of the mill base plate 7. Draw a rolling center wire 24 on the auxiliary rolling center line 3. Suspend three second plumb bobs 25, located in the middle and at both ends of the mill base plate 7 respectively. Use a long micrometer roller 26 to measure the vertical distance between the second plumb bobs 25 and the edge of the mill base plate 7, so that the vertical distances between the three second plumb bobs 25 and the edge of the mill base plate 7 are equal and consistent with the design drawings.

[0016] 6. Leveling of the rolling mill base plate 7.

[0017] First, use a square level 27 to measure and align the horizontality of the single mill base plate 7 in both longitudinal and transverse directions along the centerline 23. Then, place a 4m straightedge 28 on the centerline 23 of the mill base plate 7 and use the square level 27 to measure and align the overall horizontality of the single mill base plate 7. Finally, place 4m straightedges 28 and 5m straightedges 29 on the two mill base plates 7 respectively to measure and adjust the relative horizontality of the two mill base plates 7. It is particularly important to note that when using 4m straightedges 28 and 5m straightedges 29, a 10mm thick gauge block 30 should be placed under each end of the straightedge to ensure proper contact between the 4m straightedges 28 and 5m straightedges 29 and the mill base plate 7.

[0018] 7. Alignment of the perpendicularity of the mill base plate 7 with the auxiliary rolling center line 2

[0019] According to the installation process of the six-stand cold continuous rolling mill, the inlet side of mill #1 is a fixed base plate 31, the outlet side of mills #2 to #6 is a fixed base plate 31, and the other side is a movable base plate 32. After the mill stand 33 is installed, the fixed base plate 31 and the mill stand 33 are checked with a 0.05mm feeler gauge and there is no gap. The movable base plate 32 and the mill stand 33 have a gap of 0.3-0.5mm. Therefore, the alignment of the perpendicularity of the mill base plate 7 relative to the auxiliary rolling center line 2 should be based on the fixed base plate 31. The alignment of the perpendicularity of the fixed base plate 31 to the rolling center line is done using a swing arm. The alignment of the perpendicularity of the movable base plate 32 to the auxiliary rolling center line 2 is based on the fixed base plate 31. The distance between the three points in the middle and at both ends of the two base plates can be adjusted by measuring and adjusting the distance using a long micrometer roller 26.

[0020] A self-made swing arm is installed in the middle of the fixed base plate 31. Each component of the swing arm should be precision machined according to the design dimensions. When installing the swing arm, it is necessary to ensure that the swing rod 34 is perpendicular to the connecting shaft 35. The connecting shaft 35 should always remain parallel to the rolling mill base plate 7 when rotating. A short micrometer roller 26 is installed on the swing rod 34. The connecting shaft 35 is rotated with the handle 37. The minimum distance lA and lB between the two contact points A and B of the swing rod 34 and the rolling center wire 21 are measured by the short micrometer roller 26 on the swing rod 34. The distance between A and B is measured as L. The fixed base plate 31 is adjusted so that |lA-lB| / L≦0.1 / 1000.

[0021] 8. Displacement and repositioning of the rolling mill movable base plate 32

[0022] During the hoisting of the rolling mill stand 33, absolute verticality cannot be guaranteed. The actual horizontal width of the rolling mill stand 33 after hoisting must be greater than or equal to the nominal width between the fixed base plate 31 and the movable base plate 32. To prevent the base plates from shifting due to impact during direct installation of the rolling mill stand 33, the movable base plate 32 needs to be moved outward by 3mm-5mm. After the rolling mill stand 32 is installed, the movable base plate 32 should be reset. After the fixed base plate 31 and the movable base plate 32 pass inspection, all shim groups 8 are spot-welded to prevent misalignment of the shim groups 8 during the horizontal movement of the movable base plate 32, which would cause changes in the elevation and level of the movable base plate 32. Install a dial indicator 38 on each of the four facades at the two outer corners of the fixed base plate 31 and the movable base plate 32. Zero the dial indicator 38 and record the reading. Install a 20t screw jack 39 on each of the four facades at the two inner corners of the movable base plate 32. Slowly move the movable base plate 32 outward by 5mm, read the readings of the four dial indicators 38 on the outer side of the movable base plate 32 and record them. Remove the 20t screw jack 39 from the inner facade of the movable base plate. Set up a 32t screw jack 40 on each of the four facades at the two outer corners of the fixed base plate 31 and the movable base plate 32, and make it in close contact with the facade of the base plate. After the mill stand 33 is hoisted into place and aligned as required, use the 32t screw jack 40 to push and move the movable base plate 32 inward by 5mm, so that the movable base plate 32 is returned to its original position. During the entire process of hoisting the mill stand 33 until the movable base plate 32 is returned to its original position, observe that the reading of the dial indicator 38 set up on the fixed base plate 31 should not change.

[0023] The advantages of this invention are as follows: using a long line to check a short line ensures the accuracy of the baseline; using extended expansion bolts to adjust the grouting ensures high grouting efficiency and accuracy; using gauge blocks at both ends of the straightedge reduces the contact area between the straightedge and the base plate, eliminating contact errors; using a swing arm to align the perpendicularity of the rolling mill base plate to the rolling center line ensures fast alignment and high accuracy; and using dial indicators and jacks in four directions to control the movement of the movable base plate eliminates installation errors. Overall, the invention is simple and easy to implement, has a short construction period, low construction cost, and high installation accuracy. Attached Figure Description

[0024] Figure 1 This is a diagram showing the layout of the center marker plate and elevation points. The auxiliary elevation point is 1, the auxiliary rolling center line is 2, the auxiliary rolling mill center line is 3, the permanent elevation point is 4, the permanent rolling center line is 5, and the permanent rolling mill center line is 6.

[0025] Figure 2 This is a top view of the shim base. It includes 9 flat shims and 10 square washers.

[0026] Figure 3 This is a planar view of the shim base. It includes 8 shims, 11 M12 extended expansion bolts, 12 M12 nuts, and 13 inclined shims.

[0027] Figure 4 This is an installation diagram of the rolling mill base plate. The components include: rolling mill base plate 7, sleeve 14, anchor bolts 15, M64 thick washer 16, M64 nut 17, preload chamber 18, M110 thick washer 19, and M110 nut 20.

[0028] Figure 5 Axial view for aligning the bottom plate of the rolling mill. The components include: rolling center wire line 21, first plumb bob 22, bottom plate center line 23, rolling mill center wire line 24, second plumb bob 25, and long micrometer roller 26.

[0029] Figure 6 This is a diagram for aligning the level of the rolling mill base plate. The dimensions are: square level 27, 4m flat ruler 28, 5m flat ruler 29, and gauge block 30.

[0030] Figure 7 Axonometric drawing for leveling the rolling mill base plate. Dimensions: Square level 27, 4m straightedge 28, 5m straightedge 29, gauge block 30.

[0031] Figure 8 This is the process layout diagram for a six-stand cold continuous rolling mill. It includes a fixed base plate (31), a movable base plate (32), and a mill archway (33).

[0032] Figure 9 A diagram for aligning the verticality of the mill base plate relative to the rolling line. The components include: rolling center wire line 21, fixed base plate 31, movable base plate 32, swing rod 34, connecting shaft 35, short micrometer roller 36, and handle 37.

[0033] Figure 10 Axial view for aligning the verticality of the mill base plate relative to the rolling line. The components include: rolling center wire line 21, fixed base plate 31, movable base plate 32, swing arm 34, connecting shaft 35, short micrometer roller 36, and handle 37.

[0034] Figure 11 Alignment drawing for the base plate of a six-stand continuous rolling mill.

[0035] Figure 12 Diagram showing the displacement of the movable base plate. The components include: fixed base plate 31, movable base plate 32, dial indicator 38, and 20t screw jack 39.

[0036] Figure 13 Repositioning diagram of the movable base plate. Among them, the fixed base plate is 31, the movable base plate is 32, the rolling mill archway is 33, the dial indicator is 38, and the 32t screw jack is 40. Detailed Implementation

[0037] Example 1

[0038] The Shougang Qian'an New Energy Vehicle Electrical Steel Six-Stand Continuous Rolling Mill is the world's most advanced cold continuous rolling mill and the world's first six-stand cold continuous rolling production line. Compared with other cold continuous rolling mills, it has finer roll diameters, produces thinner rolled products, has higher rolling speeds, a higher degree of automation, and more production modes. It also has higher requirements for installation accuracy, especially for the installation accuracy of the mill base plate. The overall levelness requirement is no greater than 0.05 / 1000, the perpendicularity error between a single mill and the rolling line is no greater than 0.1 / 1000, and the cumulative perpendicularity error between the six mills and the rolling line is no greater than 0.15 / 1000.

[0039] To maximize installation accuracy and minimize construction costs while ensuring safety, quality, and timely completion, a construction method for the base plate installation of a six-stand cold rolling mill was adopted. The mill centerline was set using a long-line control method for the short-line installation. The levelness of the base plate was achieved using a straightedge paired with a frame level with an accuracy of 0.02 / 1000. The perpendicularity of the base plate to the rolling line was achieved using a swing-arm method. This method fully utilized the existing construction environment, overcame technical challenges, and completed the installation and alignment of a single mill base plate in just 5 days, 5 days ahead of schedule. The acceptance accuracy far exceeded the design error limits, resolving various technical difficulties in the installation of the base plate of the six-stand cold rolling mill.

[0040] 1. Measurement and layout

[0041] The rational layout of the measurement network, the objective accuracy of the measurement, and the accuracy of the measuring instruments all play a decisive role in the installation accuracy. An auxiliary elevation point 1, an auxiliary rolling center line 2, and six auxiliary rolling mill center lines 3 perpendicular to the auxiliary rolling center line 2 are set at -3.445m; a permanent elevation point 4, a permanent rolling center line 5, and six permanent rolling mill center lines 6 perpendicular to the permanent rolling center line 5 are set at ±0.0m.

[0042] 2. Foundation grouting

[0043] Because the installation accuracy requirements of the grout pad assembly 8 for the mill base plate 7 foundation are high, extended expansion bolts 11 are used to adjust the grout pad assembly 8 to facilitate leveling. One expansion bolt is welded to each of the four corners of the flat shim 9 along its width. For each square washer 10, an M12x240 extended expansion bolt 11 is installed directly below it, based on the actual position of the square washer 10 after the flat shims 9 are installed. The flat shims 9 are then installed on the extended expansion bolts 11. The shim group 8 is then fine-tuned and aligned using the M12 nuts 12 of the extended expansion bolts 11. When aligning the shim group 8, the uppermost inclined shim 13, which contacts the equipment, should be used as the reference. A 0.05mm feeler gauge should be used to check for gaps between the shims. Finally, each set of flat shims 9 is supported and grouted.

[0044] 3. Installation of rolling mill base plate 7

[0045] After the grouting layer on the flat shim 9 has reached its strength, use an oxy-acetylene torch or a cutting tool to remove the sealing cap on the anchor bolt sleeve 14 and thoroughly clean the dust and water inside the sleeve 14. Place the hammer-shaped anchor bolt 15 into the sleeve 14 and cover it with a t=50mm thick sponge sealing ring to prevent grout from flowing into the sleeve 14 during the secondary grouting of the mill base plate 7. Set up the shim sets 8, and measure and calibrate the elevation of the four sets of shim sets 8 at the four corners of the foundation base plate 7 to the design dimensions. The elevation of the remaining shim sets 8 should be 0.2mm lower than the design elevation. Hoist the inlet and outlet mill base plate 7 onto the shim sets 8. Install M64 thick washers 16 and M64 nuts 17 on the M64 anchor bolts 15, and install the pre-compression chamber 18, M110 thick washers 19 and M110 nuts 20 on the M110 anchor bolts 15 to replace the mill archway.

[0046] 4. Alignment of the rolling mill base plate at elevation 7

[0047] The alignment of the mill base plate 7 elevation was directly measured and aligned using a Trimble electronic digital display level. With the auxiliary elevation point 1 as the reference, the alignment was first roughed out without tightening the anchor bolts 15, and then the shim set 8 was compacted and the anchor bolts 15 were tightened before fine alignment.

[0048] 5. Alignment of position 7 on the rolling mill base plate

[0049] Draw a rolling center wire 21 on the auxiliary rolling center line 2. Suspend two first plumb bobs 22 above the single mill base plate 7. The distance between the first plumb bobs 22 and the edge of the mill base plate 7 should not exceed the edge of the mill base plate 7. Adjust the mill base plate 7 so that the projection of the center point of the two first plumb bobs 22 is exactly on the center line 23 of the mill base plate 7. Draw a rolling center wire 24 on the auxiliary rolling center line 3. Suspend three second plumb bobs 25, located in the middle and at both ends of the mill base plate 7 respectively. Use a long micrometer roller 26 to measure the vertical distance between the second plumb bobs 25 and the edge of the mill base plate 7, so that the vertical distances between the three second plumb bobs 25 and the edge of the mill base plate 7 are equal and consistent with the design drawings.

[0050] 6. Leveling of the rolling mill base plate 7.

[0051] First, use a square level 27 to measure and align the horizontality of the single mill base plate 7 in both longitudinal and transverse directions along the centerline 23. Then, place a 4m straightedge 28 on the centerline 23 of the mill base plate 7 and use the square level 27 to measure and align the overall horizontality of the single mill base plate 7. Finally, place 4m straightedges 28 and 5m straightedges 29 on the two mill base plates 7 respectively to measure and adjust the relative horizontality of the two mill base plates 7. It is particularly important to note that when using 4m straightedges 28 and 5m straightedges 29, a 10mm thick gauge block 30 should be placed under each end of the straightedge to ensure proper contact between the 4m straightedges 28 and 5m straightedges 29 and the mill base plate 7.

[0052] 7. Alignment of the perpendicularity of the mill base plate 7 with the auxiliary rolling center line 2

[0053] According to the installation process of the six-stand cold continuous rolling mill, the inlet side of mill #1 is a fixed base plate 31, the outlet side of mills #2 to #6 is a fixed base plate 31, and the other side is a movable base plate 32. After the mill stand 33 is installed, the fixed base plate 31 and the mill stand 33 are checked with a 0.05mm feeler gauge and there is no gap. The movable base plate 32 and the mill stand 33 have a gap of 0.3-0.5mm. Therefore, the alignment of the perpendicularity of the mill base plate 7 with respect to the auxiliary rolling center line 2 should be based on the fixed base plate 31. The alignment of the perpendicularity of the fixed base plate 31 with the auxiliary rolling center line 2 is done using a swing arm. The alignment of the perpendicularity of the movable base plate 32 with the auxiliary rolling center line 2 is based on the fixed base plate 31. The distance between the three points in the middle and at both ends of the two base plates can be adjusted by measuring and adjusting the distance using a long micrometer roller 26.

[0054] A self-made swing arm is installed in the middle of the fixed base plate 31. Each component of the swing arm should be precision machined according to the design dimensions. When installing the swing arm, it is necessary to ensure that the swing rod 34 is perpendicular to the connecting shaft 35. The connecting shaft 35 should always remain parallel to the rolling mill base plate 7 when rotating. A short micrometer roller 26 is installed on the swing rod 34. The connecting shaft 35 is rotated with the handle 37. The minimum distance lA and lB between the two contact points A and B of the swing rod 34 and the rolling center wire 21 are measured by the short micrometer roller 26 on the swing rod 34. The distance between A and B is measured as L. The fixed base plate 31 is adjusted so that |lA-lB| / L≦0.1 / 1000.

[0055] 8. Displacement and repositioning of the rolling mill movable base plate 32

[0056] During the hoisting of the rolling mill stand 33, absolute verticality cannot be guaranteed. The actual horizontal width of the rolling mill stand 33 after hoisting must be greater than or equal to the nominal width between the fixed base plate 31 and the movable base plate 32. To prevent the base plates from shifting due to impact during direct installation of the rolling mill stand 33, the movable base plate 32 needs to be moved outward by 3mm-5mm. After the rolling mill stand 32 is installed, the movable base plate 32 should be reset. After the fixed base plate 31 and the movable base plate 32 pass inspection, all shim groups 8 are spot-welded to prevent misalignment of the shim groups 8 during the horizontal movement of the movable base plate 32, which would cause changes in the elevation and level of the movable base plate 32. Install a dial indicator 38 on each of the four facades at the two outer corners of the fixed base plate 31 and the movable base plate 32. Zero the dial indicator 38 and record the reading. Install a 20t screw jack 39 on each of the four facades at the two inner corners of the movable base plate 32. Slowly move the movable base plate 32 outward by 5mm, read the readings of the four dial indicators 38 on the outer side of the movable base plate 32 and record them. Remove the 20t screw jack 39 from the inner facade of the movable base plate. Set up a 32t screw jack 40 on each of the four facades at the two outer corners of the fixed base plate 31 and the movable base plate 32, and make it in close contact with the facade of the base plate. After the mill stand 33 is hoisted into place and aligned as required, use the 32t screw jack 40 to push and move the movable base plate 32 inward by 5mm, so that the movable base plate 32 is moved back to its original position. During the entire process of hoisting the mill stand 33 until the movable base plate 32 is moved back to its original position, observe that the dial gauge reading 38 set up on the fixed base plate 31 should not change.

Claims

1. A method for installing the bottom plate of a six-stand cold rolling mill, characterized in that, The specific construction steps are as follows: 1) Measurement and layout An auxiliary elevation point (1), an auxiliary rolling center line (2), and six auxiliary mill center lines (3) perpendicular to the auxiliary rolling center line (2) are set at -3.445m; a permanent elevation point (4), a permanent rolling center line (5), and six permanent mill center lines (6) perpendicular to the permanent rolling center line (5) are set at ±0.0m; the auxiliary rolling center line (2), auxiliary mill center line (3), permanent rolling center line (5), and permanent mill center line (6) are all set using a Swiss Leica TDA5005 total station. The auxiliary rolling center line (2) and auxiliary mill center line (3) are then checked by hanging a steel wire and a plumb line above the long-distance permanent rolling center line (5) and permanent mill center line (6). There should be no deviation between the two. 2) Foundation grouting The grouting of the mill base plate (7) foundation is adjusted using extended expansion bolts (11); one is welded to each of the four corners of the flat pad (9) in the width direction. The square washers (10) are installed according to the actual position of the square washers (10) after the flat shims (9) are installed. An M12x240 extended expansion bolt (11) is installed directly below each square washer (10). The flat shims (9) are then installed on the extended expansion bolts (11). The shim group (8) is finely adjusted and aligned using the M12 nuts (12) of the extended expansion bolts (11). When aligning the shim group (8), the uppermost inclined shim (13) should be aligned with the upper surface of the inclined shim (13) that contacts the equipment. The gap between the shims should be checked with a 0.05mm feeler gauge. Finally, each set of flat shims (9) is grouted. 3) Installation of the rolling mill base plate (7) After the grouting layer of the flat shim (9) has reached strength, use an oxy-acetylene torch or a cutting tool to remove the sealing cap on the anchor bolt sleeve (14) and thoroughly clean the dust and water inside the sleeve (14); place the hammer-shaped anchor bolt (15) into the sleeve (14) and cover it with a t=50mm thick sponge sealing ring to prevent the grout from flowing into the sleeve (14) during the secondary grouting of the mill base plate (7); set up the shim sets (8), and place the four sets of shim sets (8) at the four corners of the foundation base plate (7). The elevation measurement was checked to the design dimensions. The elevation of the remaining shim group (8) was 0.2mm lower than the design elevation. The inlet and outlet mill base plate (7) was hoisted onto the shim group (8). M64 thick washers (16) and M64 nuts (17) were installed on the M64 anchor bolts (15). The pre-compression chamber (18), M110 thick washers (19) and M110 nuts (20) were installed on the M110 anchor bolts (15) to replace the mill archway. 4) Alignment of the elevation of the rolling mill base plate (7) The elevation of the mill base plate (7) is directly measured and aligned using a Tianbao electronic digital display level. The auxiliary elevation point (1) is used as the reference. The rough alignment is first performed without tightening the anchor bolts (15), and then the shim set (8) is compacted and the anchor bolts (15) are tightened before fine alignment. 5) Alignment of the position of the rolling mill base plate (7) Pull out the rolling center wire (21) on the auxiliary rolling center line (2), and hang two first plumb bobs (22) above the single mill block bottom plate (7). The distance between the first plumb bobs (22) and the edge of the mill bottom plate (7) should not exceed the edge of the mill bottom plate (7). Adjust the mill bottom plate (7) so that the projection of the center point of the two first plumb bobs (22) is exactly on the center line (23) of the mill bottom plate (7). Pull out the rolling center wire (24) on the auxiliary rolling center line (3), and hang three second plumb bobs (25) located in the middle and at both ends of the mill bottom plate (7). Use a long micrometer roller (26) to measure the vertical distance between the second plumb bobs (25) and the edge of the mill bottom plate (7) so that the vertical distance between the three second plumb bobs (25) and the edge of the mill bottom plate (7) is equal and consistent with the design drawings. 6) Leveling of the rolling mill base plate (7) First, use a square level (27) to measure and align the horizontality of the single mill base plate (7) in both longitudinal and transverse directions along the center line (23); then place a 4m straightedge (28) on the center line (23) of the mill base plate (7) and use the square level (27) to measure and align the overall horizontality of the single mill base plate (7); finally, set up a 4m straightedge (28) and a 5m straightedge (29) on the two mill base plates (7) to measure and adjust the relative horizontality of the two mill base plates (7); when using the 4m straightedge (28) and the 5m straightedge (29), place a 10mm thick gauge block (30) at each end of the straightedge to eliminate the situation where the 4m straightedge (28) and the 5m straightedge (29) do not make proper contact with the mill base plate (7); 7) Alignment of the verticality of the mill base plate (7) relative to the auxiliary rolling centerline (2) According to the installation process of the six-stand cold continuous rolling mill, the entrance side of the No. 1 mill is a fixed base plate (31), the exit side of the No. 2 to No. 6 mills is a fixed base plate (31), and the other side base plate is a movable base plate (32). After the mill arch (33) is installed, the fixed base plate (31) and the mill arch (33) are checked with a 0.05mm feeler gauge and there is no gap. The movable base plate (32) and the mill arch (33) have a gap of 0.3-0.5mm. Therefore, the alignment of the perpendicularity of the mill base plate (7) relative to the auxiliary rolling center line (2) should be based on the fixed base plate (31). The alignment of the perpendicularity of the fixed base plate (31) and the auxiliary rolling center line (2) is done by using a swing arm. The alignment of the perpendicularity of the movable base plate (32) and the auxiliary rolling center line (2) is based on the fixed base plate (31). The distance between the three points in the middle and at both ends of the two base plates can be adjusted by measuring and adjusting the distance using a long micrometer roller (26). Install a self-made swing arm in the middle of the fixed base plate (31). Each part of the swing arm should be precisely machined according to the design dimensions. When installing the swing arm, it must be ensured that the swing rod (34) is perpendicular to the connecting shaft (35). The connecting shaft (35) should always remain parallel to the mill base plate (7) when rotating. Install a short micrometer roller (26) on the swing rod (34). Rotate the connecting shaft (35) with the handle (37). Measure the minimum distance lA and lB between the two contact points A and B of the swing rod (34) and the rolling center wire (21) through the short micrometer roller (26) on the swing rod (34). The distance between A and B is measured as L. Adjust the fixed base plate (31) so that |lA-lB| / L≦0.1 / 1000. 8) Displacement and repositioning of the rolling mill movable base plate (32) When hoisting the mill stand (33), it is impossible to guarantee that the mill stand (33) is absolutely vertical. The actual horizontal width of the mill stand (33) after hoisting must be greater than or equal to the nominal width between the fixed base plate (31) and the movable base plate (32). The movable base plate (32) needs to be moved outward by 3mm-5mm. After the mill stand (32) is installed, the movable base plate (32) is reset. After the fixed base plate (31) and the movable base plate (32) pass the acceptance test, all the shim groups (8) are spot welded to prevent the shim groups (8) from being misaligned when the movable base plate (32) is moved, which would cause changes in the elevation and level of the movable base plate (32). A dial indicator (38) is installed on each of the four facades at the two outer corners of the fixed base plate (31) and the movable base plate (32). The dial indicator (38) is zeroed and the reading is recorded. The four facades at the two inner corners of the movable base plate (32) are also installed on the movable base plate (32). A 20t screw jack (39) is set up on each side of the wall. The movable base plate (32) is slowly moved outward and pushed 5mm. The readings of the four dial gauges (38) on the outside of the movable base plate (32) are read and recorded. The 20t screw jacks (39) on the inner side of the movable base plate are removed. A 32t screw jack (40) is set up on each of the four sides of the fixed base plate (31) and the two outer corners of the movable base plate (32) and is in close contact with the base plate. After the mill archway (33) is hoisted into place and aligned, the 32t screw jack (40) is used to push and move the movable base plate (32) inward 5mm so that the movable base plate (32) is moved back to its original position. During the entire process of hoisting the mill archway (33) until the movable base plate (32) is moved back to its original position, the readings of the dial gauges (38) set up on the fixed base plate (31) should not change.

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