CN107626752A - Correction method for roll pass station - Google Patents

Abstract

The invention relates to a roll pass station calibration method. It includes the following steps: draw the center line of the four planes of the hole type inspection head with a stylus, clean and check each part, detect and adjust the standard frame; repeat the measurement and adjustment until the gap between the positioning block and the slide rail is ≤0.02 mm, the levelness of the bore axis of the standard rack is ≤0.02mm/m; when measuring the coincidence error X and Y of the center line of the standard rack and the roll pass station, if the following formula is satisfied: It is qualified, otherwise calculate the thickness of the gasket under the slide rail and the positioning block; use the drawing software to directly and accurately mark the thickness of the gasket that needs to be added or subtracted on the drawing, and add or subtract the thickness of the gasket under the slide rail and the positioning plate according to the result. Subtract the shim; repeat the above steps until the accuracy meets the requirements. The cumbersome steps in the measurement and calculation are omitted, the work efficiency of the roll pass station correction is improved, the accuracy of the roll stand is improved, and the product quality of the seamless steel pipe is improved.

Description

A Roll Pass Station Calibration Method

technical field

The invention relates to the field of rolling mill calibration methods, in particular to a roll pass station calibration method

Background technique

The PQF continuous rolling mill is a three-roller continuous hot-rolled seamless steel pipe mill. The roll pass station is a special testing equipment used to detect whether the closed passes of the three rolls on the continuous roll stand meet the requirements of the rolling process. The quality of the pass accuracy of the continuous roll stand directly affects the product quality of the seamless steel pipe, and the roll pass station is the key equipment for testing whether the rolling pass of the continuous roll stand is qualified. Therefore, the accuracy of the roll pass station is the same as Whether to determine the quality of seamless steel pipe products. The solid production process stipulates that the roll pass station should be calibrated once a month to ensure that the roll pass station has qualified accuracy and reliable performance.

The measurement and correction of the roll pass station is to use the standard frame as a reference measuring tool to measure the error of the center line of the roll pass station, and then adjust the thickness of the shims at the bottom of the two slide rails of the roll pass station and the bottom of the four positioning plates. The process of measuring and adjusting the center line of the standard rack and the roll pass station coincides with each other or the coincidence degree error δ≤±0.02mm. Brief introduction of the current roll pass station calibration method:

1. Install the hole type inspection head, and the hole type inspection head needs to be leveled with a level to avoid measurement errors;

2. Hoist the standard rack into the mobile trolley, and drive the trolley to the measurement working position;

3. Measure the horizontal distance X1, X2 and the vertical distance Y1, Y2 between the wall of the bore hole in the center of the standard frame and the side surface of the hole type inspection head and the plane with an inner micrometer according to the diagram;

4. Calculate the thicknesses U1 and U2 of the adjustment gaskets of the sliding plate and positioning block in the moving trolley when the centerline of the standard rack and the centerline of the roll pass station coincide.

L1, L2 can be calculated from x1, x2, y1, y2

5. Adjust the backing plate thickness of the mobile trolley according to U1 and U2, so that the center line of the standard rack coincides with the center line of the roll pass station.

There are following deficiencies: 1. The roll pass station inspection data after several calibrations is unstable, and the rolling effect of the roll stand is not good, and its appearance is finally reflected in the uneven wall thickness of the steel pipe rolled by the continuous rolling mill, resulting in waste products. 2. The procedure for calculating and adjusting the thickness of gaskets is cumbersome, time-consuming and labor-intensive. 3. It is easy to make typos in the calculation process and cause the calibration to fail. In short, the calibration method of the original roll pass station is rough and the steps are cumbersome, especially some key inspection steps and technical means are ignored, thus increasing the reject rate of steel pipes and causing huge economic losses.

Contents of the invention

In order to solve the deficiencies of the prior art, the present invention provides a fast, accurate and reliable method for measuring and correcting the roll pass station, which improves the detection accuracy of the roll pass station and improves the quality of seamless steel pipe products.

In order to achieve the above object, the present invention adopts the following technical solutions to realize:

A method for correcting a roll pass station, specifically comprising the following steps:

(1) Calibration preparation: draw the center line of the 4 planes of the hole type inspection head with a stylus, clean and check each part, detect and adjust the standard frame, so that its size and position accuracy meet the requirements of the drawing;

(2) Repeat the measurement and adjustment until the gap between the positioning block of the standard rack and the positioning block of the mobile trolley and the slide rail of the standard rack and the slide rail of the mobile trolley is ≤0.02mm, and the levelness of the axis direction of the boring hole of the standard rack is 0.02mm within /m;

(3) Measure the coincidence degree between the standard frame and the center line of the roll pass station, if the coincidence degree error X, Y satisfy the following formula: It is qualified, otherwise calculate the thickness of the adjustment gasket under the slide rail and the positioning block;

(4) Use the drawing software to directly and accurately mark the thickness of the gasket that needs to be added or subtracted under the slide rail and the positioning plate on the drawing;

(5) According to the result of step 4, add or subtract spacers under the slide rail and positioning plate;

(6) Repeat steps 3-5 to measure the coincidence degree of the standard frame and the center line of the roll pass station. If the coincidence degree error X, Y meet the formula shown in step 3, it is qualified, otherwise, repeat the above steps to correct the roll hole The type station measures and corrects until the accuracy meets the requirements.

Described step (1) slide rail on the standard frame, positioning block, hold down plate, boring Clean and inspect the parts, and remove the dents and bumps with a fine oil stone; clean and inspect the slide rails, positioning blocks, and parts in the moving trolley, and remove the dents and bumps with the oil stone. The standard frame is measured by a three-dimensional coordinate measuring instrument and adjusted to the design size and position accuracy requirements of the engineering drawing of the standard frame by adjusting the shim method.

Said step (2) comprises the following steps: a. Install the hole-checking head on the roll pass station and use the level meter and the plane on the pass-checking head to level the pass-checking head, and the levelness is controlled at 0.02mm/m; b. Remove the two positioning blocks on the upper part of the mobile trolley; c. Hoist the standard frame into the mobile trolley and place it stably. Record the measurement data; d place the spirit level in the bore hole of the standard rack to measure the levelness of the axis of the bore hole of the standard rack, and record the measurement data; Taking the measured data into consideration, use the method of adding and subtracting the sliding rail of the moving car and the adjusting gasket under the positioning block to level the standard frame (in the direction of the axis of the boring hole); Apply display agent on the surface; g hoist the standard rack into the mobile trolley again and place it stably, repeat steps c and d to measure the slide rail between the standard rack and the mobile trolley, the gap between the standard rack and the positioning block of the mobile trolley, and bore the standard rack Level the axis direction and record the data; h Lift the standard rack out of the mobile trolley, judge the positioning block of the standard rack and the positioning block in the mobile trolley, and the zero rack slide rail and The contact state of the slide rail in the mobile trolley, calculate the thickness of the positioning block in the mobile trolley and the adjustment gasket at the bottom of the slide rail, and fine-tune it; i install the two positioning blocks in the upper part of the mobile trolley; j install the standard rack into the mobile trolley , measure the gap between the standard frame and the upper positioning block inside the mobile trolley, lift out the standard frame and level the 4 positioning blocks by adding and subtracting the adjustment gasket; k hoist the standard frame into the mobile trolley again and place it stably, repeat the above Measure and adjust step by step until the gap between the positioning block of the standard rack and the positioning block of the moving trolley and the sliding rail of the standard rack and the sliding rail of the moving trolley is ≤0.02mm, and the levelness of the boring axis of the standard rack is 0.02mm/ within m.

The step (3) starts the push-pull hydraulic cylinder to move the mobile trolley to the inspection position together with the standard frame; measure the 4 planes in place frame of the effect head with an inner diameter micrometer The horizontal distance X1, X2 and Y1, Y2 of the boring hole wall if X1, X2 and Y1, 2 satisfy the following formula: The coincidence degree of the standard frame and the center line of the roll pass station is qualified, otherwise, the thickness U1 and U2 of the adjusting gasket under the slide rail in the moving trolley and the positioning block should be calculated.

Said step (4) first calculates the offset X, Y between the standard frame and the center line of the roll pass station according to the data X1, X2, Y1, Y2 measured in the step (3), then follow the steps below Drawing on the drawing software interface: a. On the drawing software interface, make a square with a side length of 1 mm and one of its sides forming an angle of 30° with the X axis; b. Copy the square drawn in step 1 on the drawing software interface and move the square horizontally. The distance is X; c copy the square drawn in step 2 on the drawing software interface and move the square vertically. Adjust the gasket thickness U1, U2 under the slide rail and the positioning block in the mobile trolley.

The step (5) starts the push-pull hydraulic cylinder to move the mobile trolley out of the inspection position together with the standard frame, and hangs out the standard frame; according to the obtained U1 and U2, add the corresponding thickness of the sliding rail and the positioning plate in the mobile trolley Adjusting washer.

Described step (6) repeats step 3-5 to measure the coincidence degree of standard frame and roll pass station center line, as coincidence degree error X, Y satisfies following formula:

That is qualified. Otherwise, the above steps need to be repeated to measure and correct the roll pass station until the accuracy meets the requirements.

Compared with prior art, the beneficial effect of the present invention is:

1) After improving the measurement and correction method of the roll pass station, the efficiency of the measurement and correction operation of the roll pass station is improved;

2) Through the refinement of the measurement and correction steps of the roll pass station, the detection accuracy of the roll pass station is significantly improved, and the process performance is more reliable; thus the accuracy of the roll stand is significantly improved. It avoids the generation of waste products such as uneven wall thickness and rolling and folding of steel pipes. The yield of seamless steel pipes and the profit per ton of steel have been improved.

Description of drawings

Fig. 1 is the structural principle schematic diagram of roll pass station of the present invention;

Fig. 2 is the schematic diagram that roll frame of the present invention is loaded into mobile dolly;

Fig. 3 is the standard frame slide rail of the present invention, positioning block position, structural schematic diagram;

Fig. 4 is a schematic diagram of the layout of the roller pass station slide plate and positioning block of the present invention;

Fig. 5 is a standard rack engineering drawing of the present invention;

Fig. 6 is a position distribution diagram of the measuring hydraulic cylinder of the present invention;

Fig. 7 is a schematic diagram of the leveling of the hole type inspection head of the present invention;

Fig. 8 is a schematic diagram of the levelness of the measuring standard rack boring axis direction according to the present invention;

Fig. 9 is a schematic diagram of calculating and adjusting the thickness of gaskets in the present invention;

Fig. 10-Fig. 13 is that the present invention utilizes computer AutoCAD to calculate gasket thickness schematic diagram;

Fig. 14 is a schematic diagram of the correction of the roll pass station of the present invention;

Fig. 15 is a schematic diagram of the detection continuous roll frame of the roll pass station of the present invention.

In the figure: 1-Measuring hydraulic cylinder 2-Piston rod and roller 3-Zero frame 4-Support seat 5-Ring frame 6-Moving trolley 7-Hole type inspection head 8-Trolley guide rail 9-Standard frame center 10- Center of roll pass station 11-Roll frame and trolley slide rail feeler gauge measurement part 12-Roll frame and trolley positioning block feeler gauge measurement part 13-Three roll closed rolling pass 14-Dress plate 15-Boring Hole 16-Positioning Block 17-Slide Rail 18-Adjusting Gasket 19-Zero Rack Center 20-Zero Probe Center and Hole Type Inspection Center 21-Zero Probe 22-Zero Rack Center Boring 23-Center Line 24-Positioning plate 25-Roll stand

detailed description

The specific embodiment of the present invention is described in detail below in conjunction with accompanying drawing:

As shown in Figure 1-2, the PQF continuous rolling mill is a 6-stand 3-high continuous hot-rolled seamless steel pipe mill imported from Germany by Angang Steel Seamless Steel Tube Factory. The roll pass station is a random one for testing continuous rolling rolls. The special testing equipment for whether the closed rolling pass 13 of the three rolls on the stand meets the requirements of the rolling process.

The structure and working principle of the roll pass station: the roll pass station is mainly composed of: support seat 4, ring frame 5, mobile trolley 6, hydraulic cylinder of the push-pull mobile trolley, trolley guide rail 8, positioning hydraulic cylinder 1 (6 hydraulic cylinders Distributed on the ring frame 5 according to 60°, each hydraulic cylinder is equipped with a displacement encoder, and the distribution positions of 6 measuring hydraulic cylinders 1 are shown in Figure 6). During the inspection, hang the roll frame 25 in the mobile trolley 6 of the pass station, and make the positioning block 16 and slide rail 17 on the frame closely contact with the positioning block 16 and slide rail 17 in the mobile trolley by its own weight. Therefore the slide rail 17 in the mobile dolly 6 is set at an angle of 30° with the ground; the positioning block 16 is at an angle of 60° with the ground. The roll pass station is an important equipment used to detect the rolling pass accuracy of the continuous roll stand and the position accuracy of the rolling center line. Its detection step is to load the continuous roll frame 25 into the mobile trolley 6 with a crane, and start the push-pull hydraulic cylinder to pull the mobile trolley 6 into the annular frame 5 of the pass station (the position to be measured). Start measuring hydraulic cylinders 1#, 3#, 5# or 2#, 4#, 6# piston rods stretch out, when the rod end rollers contact the pressing plate 14 of the continuous roll frame 25, the 3 pendulums on the frame will When the arm and the rolls press against the pass inspection head 7 and reach the set pressure, the magnetic scale inside the hydraulic cylinder and the electrical signal are transmitted to the display to accurately display the position error and the rolling pass 13 of the three rolls in the continuous roll stand shape error.

As shown in Figure 3-15, the roll pass station calibration method specifically includes the following steps:

1. Preparation before calibration of roll pass station:

1. As shown in Figure 7, in order to reduce the measurement error, first draw the center line 23 on the four planes of the hole type inspection head 7 with a stylus.

2. For the slide rail 17, the positioning block 16, the pressing plate 14, and the boring hole 15 on the standard frame, Clean and inspect the parts, and if any scratches and bumps are found, use a fine oil stone to remove them; clean and inspect the slide rail 17, positioning block 16, and parts in the moving trolley 6, and use an oil stone if you find scratches and bumps. Clear away.

3. Use a three-dimensional coordinate measuring instrument to measure the standard frame and use the method of adjusting gasket 18 to adjust it to the design size and position accuracy requirements of the standard frame engineering drawing.

The detection and adjustment items are as follows:

(1) The positional accuracy of the four positioning blocks 16 relative to the center bore 15 of the standard rack is 1035±0.025mm;

(2) The position accuracy of the two slide rails 17 relative to the center bore 15 of the standard rack is 1080±0.052mm;

(3) The positioning accuracy of the 6 pressing plates 14 relative to the center bore hole 15 of the standard frame is 2040±0.02mm, and the coaxiality error with the center bore hole 15 of the standard frame 9 is ≤0.02mm.

2. The method and steps of measuring and correcting the roll pass station:

1. As shown in Figure 7, install the pass inspection head 7 on the roll pass station and level the pass inspection head 7 with the level meter and the plane on the pass inspection head 7, and the levelness is controlled within 0.02mm/m .

2. Remove the two positioning blocks 16 on the upper part of the mobile trolley 6.

3. As shown in Figure 2, hoist the standard rack into the mobile trolley 6 and place it stably, measure the gap between the standard rack and the mobile trolley 6 slide rail 17, the standard rack and the mobile trolley 6 positioning block 16 with a feeler gauge, and Record the measurement data.

4. As shown in Fig. 8, place the spirit level in the standard rack bore hole 15 to measure the levelness in the axial direction of the standard rack bore hole 15, and record the measurement data.

5. As shown in Figure 8, lift the standard rack out of the mobile trolley 6, and use the method of adding and subtracting the sliding rail 17 of the mobile trolley and adjusting the gasket 18 under the positioning block 16 according to the measured data in steps 3 and 4. Standard frame (boring axis direction) leveling.

6. Apply the display agent to the contact surfaces of the two positioning blocks 16 and the two slide rails 17 in the lower part of the mobile trolley 6.

7. Hoist the standard rack into the mobile trolley again 6 place it stably, repeat steps 3 and 4 to measure the standard rack and the mobile trolley

Car 6 slide rail 17, gap between standard frame and mobile car 6 positioning block 16, standard frame boring 15 axis direction

level and record the data.

8. Lift the standard rack out of the mobile trolley 6, and judge the standard machine according to the traces of the display agent and the measurement data in step 7

The frame positioning block 16 and the positioning block 16 in the mobile trolley 6 and the zero frame slide rail 17 are connected with the sliding rail 17 in the mobile trolley.

touch state. Calculate the thickness of the positioning block 16 in the mobile trolley and the bottom adjustment pad 18 of the slide rail 17 and fine-tune it.

9. Install the two positioning blocks 16 on the upper part of the mobile trolley 6 (note: do not install the bottom adjustment pad).

10. Put the standard rack into the mobile trolley 6, and measure the gap between the standard rack and the upper positioning block 16 inside the mobile trolley 6. Hang out the standard frame and use the method of adding and subtracting the adjusting gasket 18 to level the 4 positioning blocks 16.

11. Hoist the standard frame into the mobile trolley again and place it stably, repeat the above steps for measurement and adjustment. Until the gap between the positioning block 16 of the standard rack and the positioning block 16 of the moving trolley and the sliding rail 17 of the standard rack and the sliding rail of the moving trolley is ≤0.02mm, the levelness of the boring hole 15 of the standard rack in the axial direction is 0.02mm/m within.

12. As shown in Figure 9, start the push-pull hydraulic cylinder to move the mobile trolley 6 together with the standard frame to the inspection position, and measure the four planes in place of the test head with an inner micrometer The horizontal distances X1, X2 and Y1, Y2 of the 15-hole wall of the boring hole if X1, X2 and Y1, Y2 satisfy the following formula: The coincidence degree between the standard frame and the center line of the roll pass station is qualified. On the contrary, it is necessary to calculate the thickness U1, U2 of the adjustment spacer 18 under the slide rail 17 in the dolly and the positioning block 16. When measuring, the inner diameter micrometer contact should be pressed against the centerlines of the four planes in order to reduce the measurement error.

13. Calculate and adjust the thicknesses U1 and U2 of the slide rail 17 in the moving trolley 6 and the thicknesses U1 and U2 of the adjustment shims 18 under the positioning block 16 required when the center line of the standard frame and the roll pass station coincide. The AutoCAD drawing method is used to directly and accurately mark the thickness of the gasket that needs to be added or subtracted under the slide rail 17 and under the positioning plate 24 on the drawing.

First, calculate the offset between the standard rack and the center line of the roll pass station based on the data X1, X2, Y1, and Y2 measured in step 5

Then follow the steps below to draw on the computer AutoCAD interface:

(1) As shown in Figure 10, on the computer AutoCAD interface, make a square with a side length of 1 mm and one side forming an angle of 30° with the X axis.

(2) As shown in Figure 11, copy the square drawn in step 1 on the AutoCAD interface of the computer, change the line type to a dotted line, and move X horizontally.

(3) As shown in Figure 12, copy the square drawn in step 2 on the AutoCAD interface of the computer, change the line type to double-dot dash line, and move Y horizontally.

(4) As shown in Figure 13, on the computer AutoCAD interface, mark out the adjustment spacer 18 below the slide rail 17 and the positioning block 16 required for adjusting the coincidence degree of the center line of the standard frame and the roll pass station Thickness U1, U2.

The first advantage of the above method is that the obtained values of U1 and U2 are accurate. (AutoCAD can be accurate to 6 decimal places) The second is to avoid the cumbersome calculation procedures and easy typos in the calculation process that lead to calibration failure.

14. Start the push-pull hydraulic cylinder to move the mobile trolley and the standard frame out of the inspection position, and lift out the standard frame.

15. According to the obtained U1 and U2, add corresponding adjustment pads 18 under the slide rail 17 and positioning plate 16 in the moving trolley.

16. Repeat steps 2-6 to measure the coincidence degree of the center line of the standard frame and the roll pass station, such as the coincidence degree error X, Y satisfy the following formula: It is qualified, otherwise, the above steps need to be repeated to measure and correct the roll pass station until the accuracy meets the production process requirements.

Adopting a new roll pass station correction method saves the cumbersome steps in measurement and calculation and improves the work efficiency of roll pass station correction. The precision of the roll stand is improved, thereby improving the product quality of the seamless steel pipe.

The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto, any person familiar with the technical field within the technical scope disclosed in the present invention, according to the technical solution of the present invention Any equivalent replacement or change of the inventive concepts thereof shall fall within the protection scope of the present invention.

Claims (6)

1. a roll pass station correction method is characterized in that, specifically comprises the steps: (1) Calibration preparation: draw the center line of the 4 planes of the hole type inspection head with a stylus, clean and check each part, detect and adjust the standard frame, so that its size and position accuracy meet the requirements of the drawing; (2) Repeat the measurement and adjustment until the gap between the positioning block of the standard rack and the positioning block of the mobile trolley and the slide rail of the standard rack and the slide rail of the mobile trolley is ≤0.02mm, and the levelness of the axis direction of the boring hole of the standard rack is 0.02mm within /m; (3) Measure the coincidence degree between the standard frame and the center line of the roll pass station, if the coincidence degree error X, Y satisfy the following formula: It is qualified, otherwise calculate the thickness of the adjustment gasket under the slide rail and the positioning block; (4) Use the drawing software to directly and accurately mark the thickness of the gasket that needs to be added or subtracted under the slide rail and the positioning plate on the drawing; (5) According to the result of step 4, add or subtract spacers under the slide rail and positioning plate; (6) Repeat steps 3-5 to measure the coincidence degree of the standard frame and the center line of the roll pass station. If the coincidence degree error X, Y meet the formula shown in step 3, it is qualified, otherwise, repeat the above steps to correct the roll hole The type station measures and corrects until the accuracy meets the requirements. 2. A method for correcting roll pass station according to claim 1, characterized in that, said step (1) uses a three-dimensional coordinate measuring instrument to measure the standard frame and adjusts it to the standard machine frame by adjusting shims. The design dimensions and position accuracy requirements of the frame engineering drawings. 3. a kind of roll pass station calibration method according to claim 1, is characterized in that, described step (2) comprises the following steps: a. Level the hole type inspection head on the plane on the type inspection head, and the levelness is controlled at 0.02mm/m; b Remove the two positioning blocks on the upper part of the mobile trolley; c Lift the standard frame into the mobile trolley and place it stably, and measure it with a feeler gauge The gap between the standard rack and the moving trolley slide rail, the standard rack and the positioning block of the moving trolley, and record the measurement data; d put the spirit level in the boring hole of the standard rack to measure the levelness of the axis direction of the boring hole of the standard rack, And record the measurement data; e hang the standard frame out from the mobile car, according to the comprehensive consideration of the measured data of steps c and d, adopt the method of adding and subtracting the sliding rail of the mobile car and the adjustment gasket under the positioning block to place the standard frame (boring hole) axis direction) leveling; f apply display agent on the contact surfaces of the two positioning blocks and two slide rails in the lower part of the mobile trolley; g hoist the standard rack into the mobile trolley again and place it stably, repeat steps c and d to measure the standard rack and The slide rail of the mobile trolley, the gap between the standard rack and the positioning block of the mobile trolley, the levelness of the bore axis of the standard rack and record the data; The measured data judges the contact state of the positioning block of the standard rack and the inner positioning block of the moving trolley, and the sliding rail of the zero position rack and the inner sliding rail of the moving trolley, calculates the thickness of the positioning block of the moving trolley and the adjusting gasket at the bottom of the sliding rail, and fine-tunes it. adjust; i install the two positioning blocks on the upper part of the mobile trolley; j put the standard rack into the mobile trolley, measure the gap between the standard rack and the upper positioning blocks inside the mobile trolley, and lift out the standard rack by adding and subtracting adjustment gaskets. Level the 4 positioning blocks; k hoist the standard rack into the mobile trolley again and place it stably, repeat the above steps to measure and adjust until the positioning block of the standard rack and the positioning block of the mobile trolley and the slide rail of the standard rack and the sliding rail of the mobile trolley are reached. The gap between the rails is ≤0.02mm, and the levelness of the standard frame boring axis is within 0.02mm/m. 4. A kind of roll pass station correction method according to claim 1, it is characterized in that, described step (3) starts push-pull hydraulic cylinder to move mobile trolley together with standard frame to inspection position; 4 flats of head to standard rack The horizontal distances X1, X2 and Y1, Y2 of the borehole wall. 5. A kind of roll pass station correction method according to claim 1, is characterized in that, described step (4) at first calculates standard machine according to the data X1, X2, Y1, Y2 measured in step (3) The offset X, Y between the frame and the center line of the roll pass station, and then draw on the drawing software interface according to the following steps: a On the drawing software interface, make a side length of 1mm and one of the sides is 30° to the X axis The square of the corner; b copy the square drawn in step 1 on the drawing software interface and move the square horizontally as X; c copy the square drawn in step 2 on the drawing software interface and move the square vertically as Y; d in On the interface of the drawing software, mark the thicknesses U1 and U2 of the adjustment shims under the sliding rails in the mobile trolley and the positioning blocks required to adjust the coincidence degree of the center line of the standard rack and the roll pass station. 6. A kind of roll pass station correction method according to claim 1, is characterized in that, described step (5) starts push-pull hydraulic cylinder to move mobile trolley together with standard frame out of inspection position, hangs out standard frame; According to the obtained U1 and U2, add the adjusting shims with corresponding thickness under the sliding rail and the positioning plate in the moving trolley.