JPH04313409A - Adjusting method for position for inserting stock into rolling roll - Google Patents

Abstract

PURPOSE:To obtain the satisfactory product scarcely having the degree of thickness deflection in the width direction of a rolling product by advancing a rolling work, while holding a position in which a fluctuation absolute value difference of a load value difference recognized between roll neck parts shows the minimum value. CONSTITUTION:This method selects several dimension differences for showing a difference of clearance dimensions calculated from gap dimensions g1, g1' between the end face of supports 5, 5' being right above roll ascending/descending devices 7. 7' for giving a load to the left and the right neck parts 10, 10', 20 and 20', respectively of a rolling roll. Subsequently, measurement load deviations Y1(P1-P1'), Y2(P2-P2')... between the neck parts 10, l0', 20 and 20' are calculated. Such a pressure condition as a fluctuation absolute value difference of the load value differences Y1, Y2... between the roll neck parts generated during a variation of the sum of loaded loads becomes minimum is derived. The work is executed, while taking notice of an inserting position of a stock in the axial direction of rolls 1, 2 so that the fluctuation absolute value difference of the load value differences Y1, Y2... recognized between the roll neck parts 10, 10', 20 and 20' shows the minimum value.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for adjusting the position of inserting a material into a rolling roll, which is necessary when manufacturing a metal strip having a uniform size distribution by a rolling process.

0002

[Prior Art] For the purpose of preventing the dimensional value of a product from being biased to one side in the direction perpendicular to the rotation direction of the roll, that is, perpendicular to the direction of extension of the metal strip, a roll is used to When processing and forming a strip, a method called a draining method has traditionally been used to equalize the contact surface pressure at the left and right ends of the upper and lower roll contact surfaces.

[0003] In this case, the method of confirming the equalization of the contact surface pressure of the rolling rolls, which is called the draining method, is to apply roll coolant to the rolling surface in advance, and to bring the rolling rolls arranged above and below close to each other while rotating. As the roll progresses, the pattern of roll coolant disappears from the roll surface when the upper and lower rolling rolls come into contact with each other.

[0004] This state has been confirmed by visual observation, and the pattern of roll coolant observed on the rolling surfaces of the upper and lower rolls disappears simultaneously at the left and right ends of the roll. The subsequent rolling work was carried out using the set position as the reference point for the set position of the rolling rolls at the start of the rolling work.

[0005] In this case, the midpoint of the full length of the roll determined by measuring or visually checking in the axial direction of the roll is aligned with the midpoint in the width direction of the material, and the width direction of the material is regulated by a guide to perform rolling. was going on.

[0006]

However, when measuring the set position reference point of the rolling rolls at the start of rolling operation using the water draining method described above, various inconveniences have occurred as described below. That is, when the roll coolant is mineral oil, its presence cannot be easily detected visually, and it is not easy to easily determine the reference point for the setting position of the rolling rolls at the start of the rolling operation.

[0007] Furthermore, when measuring the set position reference point of the rolling rolls at the start of rolling work using the draining method, the load between the upper and lower rolls is smaller than when the rolling work is actually being carried out. Because of this, the load distribution in the roll axis direction often differs from that observed during actual work, and it was often recognized that the rolled dimensional accuracy of the product was insufficient.

Furthermore, the draining method has the disadvantage that it cannot be carried out in rolling mills that essentially do not use roll coolant, such as skin pass mills, etc. Alternatively, it is difficult to accurately determine the midpoint of the entire length of the roll by visual inspection, and it is also difficult to match it with the midpoint in the width direction of the material. It was not easy to perform high-speed rolling.

[0009] The present invention makes it possible to grasp the load distribution similar to that in actual rolling work in terms of coefficients before turning the material into a product using a rolling mill, and then calculates the actual load distribution based on this coefficient. The purpose is to advance rolling operations and provide products with sufficient rolling dimensional accuracy.

0010

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention provides a method for connecting the left and right support ends of a roll lifting device that applies a load to each of the left and right necks of a rolling roll and a reference plane. The sum of the loads measured at each of the left and right necks of the rolling rolls without inserting material between the rolls is calculated for each of several dimensional difference conditions in which the dimensional difference between the gap dimensions is the same. When changing both a certain value specified in the central area of the required load area at the time and another value smaller than this median value and also specified, the sum of the applied loads Each time is set, the load value difference observed between the left and right roll necks in this case is calculated from the respective load values measured at the left and right necks of the rolling roll, and the calculated load between the left and right roll necks is calculated. From the variation status of the value difference, find the rolling conditions that minimize the absolute value difference of the variation of the load value difference between the left and right roll necks that occurred during the change in the above-mentioned load sum, and then,
Maintain the dimensional difference between the dimensions of the gap between the left and right support ends of the roll lifting device and the reference plane at a dimensional difference that minimizes the variation absolute value difference of the load value difference between the left and right roll necks mentioned above. Then, the material is inserted between the upper and lower rolling rolls to proceed with the rolling process, and the insertion position of the material in the axial direction of the rolls is adjusted so that the fluctuation absolute value difference of the load value difference observed between the left and right roll necks is The present invention provides a method for adjusting the position of inserting a material into a rolling roll, in which work is carried out while paying attention to the minimum value.

[0011]

[Function] The present invention provides a mechanism for making the dimensional difference between the dimensions of the gap between the left and right support ends of the roll lifting device that applies a load to the left and right necks of the rolling roll, respectively, and the reference plane to be the same. For each dimensional difference condition, the sum of the loads measured at the left and right necks of the rolling rolls, without inserting any material between the rolls, is specified in the central area of the required load area during general-purpose rolling work. and a value smaller than this median value that was also specified, each time the sum of applied loads is set, each of the values measured at the left and right necks of the roll The difference in load value observed between the left and right roll necks in this case is calculated from the applied load value, and from the fluctuation status of the calculated load value difference between the left and right roll necks, it is possible to determine the difference that occurred during the change in the sum of the applied loads mentioned above. Calculate the rolling conditions that minimize the fluctuation absolute value difference in the load value difference between the left and right roll necks, and then calculate the gap size between the left and right support ends of the roll lifting device and the reference plane. The rolling process was carried out by inserting the material between the upper and lower rolling rolls while keeping the dimensional difference at the level that minimizes the absolute difference in load value difference between the left and right roll necks. By setting the position of the rolling roll based on the actually measured coefficient, it is possible to set the appropriate roll position when taking into account the load distribution in the axial direction of the roll due to polishing of the roll surface, etc. This is because it has been confirmed that the above problem can be solved by compensating for the difference in the indicated values of the load cells set on the left and right pillars and the difference in impedance of the electric circuit.

[0012] Furthermore, when the load difference between the left and right columns is measured by subtracting the loads measured on each of the left and right columns of the roll lowering device, the load difference Y2 and the above load difference Y2 are obtained. This is why rolling is performed while maintaining the insertion position of the material in the axial direction of the roll at a position where the absolute value of the numerical difference with the load difference Y1 shows the minimum value. This is to further improve the accuracy of the thickness distribution.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a longitudinal sectional view of a four-high rolling mill to which the method of the present invention is applied.

In the figure, 1 is a stationary rolling roll, a movable rolling roll, and 3 and 4 are backing rolls assembled to the same rolls 1 and 2. ,10'20,20',30,30',40,4
0' is supported by chocks 6, 6', etc., and the lowest chocks 61, 61' are subjected to an upward load by hydraulic roll lifting devices 7, 7' via supports 5, 5'. The backing roll 4 is lifted up, and in cooperation with another backing roll 3, a roll load required for rolling is applied between the rolling rolls 1 and 2. Now, when loads P1 and P1' are applied upward by the roll lifting devices 7 and 7', output voltages corresponding to the loads P1 and P1' are generated in the load cells 8 and 8'. Neck portions 10, 10', 20, 20 of rolling rolls 1, 2
If there is a difference in the load between the two, the differential amplifiers 9 and 11 display the difference on the display meters 12 and 13, respectively. When rolling a material (flat strip) using such an apparatus, the present invention adjusts the position of the material by employing the following method.

(i) Left and right neck portions 10 of the rolling roll 102
, 10', 20, 20', and a load transmission support column 5 directly above the roll lifting device 7, 7', which applies a load to each of the rollers.
Gap dimension g between the end surfaces 51, 51' of 5' and the reference surface S
Dimensional difference Z1 (= g1 - g1'
).

(ii) Next, for each selected dimensional difference, without loading the material between the rolling rolls 1 and 2, at each of the left and right necks 10, 10', 20, and 20' of the rolling rolls 1 and 2. Sum of measured loads X1=P1+P
1', When changing to ，

(iii) Following this, Y1, Y2...
From the fluctuation situation of ・, the sum of the above applied loads X1, X2...
The roll neck 10, 10', 20, which occurred during the change in
Find pressure conditions that minimize the variation absolute value difference of the load value difference Y1, Y2... between 20',

[0018]
(iv) After that, the dimensional difference Z1 between the gap dimensions g1, g1' between the end faces 51, 51' of the left and right supports 5, 5' of the roll lifting devices 7, 7' and the reference surface S is calculated as the left and right roll necks. Load value difference Y1, Y2 between 10, 10', 20, 20'
While maintaining the dimensional difference (Zn) that minimizes the variation absolute value difference, the material is inserted between the upper and lower rolling rolls 1 and 2, and the rolling work is continued.

(v) Furthermore, the insertion position of the material in the axial direction of the rolls 1 and 2 is adjusted to the above-mentioned roll necks 10, 10', 20.
, 20' load value difference Y1, Y2...
・Carry out the work keeping in mind that the difference in the absolute value of fluctuation shows the minimum value. This method consists of the above method configuration.

(Example 1) A rolled material with a thickness of 3 m
65-35 brass (C-2680) with a width of 625 mm
Using soft material, the thickness is 1.712 mm by rolling process.
Finished a product of mm.

In this case, first, the total load is set at 100 tons, and the dimensional difference in the gap between the reference plane and the end of each column between the left and right columns is varied between -29 μm and 143 μm. Difference in load between columns Y2
After calculating, set the total load to 30 tons while keeping the difference in the gap between the reference plane between the left and right columns and the end of each column the same as when the total load was set to 100 tons. The difference Y1 in the applied load between the left and right columns was determined, and the dimensional distribution in the width direction of the product was obtained when the absolute value of the difference between Y2 and Y1 was 0 and the total load was 230 tons. The degree of thickness deviation in the width direction of the product was 0.04.

(Example 2) Thickness in the width direction of the product measured in the same manner as in Example 1 except that the insertion position of the material into the rolling roll was shifted 5 mm to the right side compared to the position in Example 1. The degree of deflection was 0.15.

(Example 3) Thickness in the width direction of the product measured in the same manner as in Example 1 except that the insertion position of the material into the rolling roll was shifted 10 mm to the right side compared to the position in Example 1. The degree of deflection was 0.30.

(Example 4) Thickness in the width direction of the product measured in the same manner as in Example 1 except that the insertion position of the material into the rolling roll was shifted 5 mm to the left compared to the position in Example 1. The degree of deflection was 0.18.

(Example 5) Thickness in the width direction of the product measured in the same manner as in Example 1 except that the insertion position of the material into the rolling roll was shifted 10 mm to the left compared to the position in Example 1. The degree of deflection was 0.29.

(Comparative Example 1) Thickness in the width direction of the product measured in the same manner as in Example 1 except that the insertion position of the material into the rolling roll was shifted 20 mm to the left compared to the position in Example 1. The degree of deflection was 0.39.

(Comparative Example 2) Thickness in the product width direction measured in the same manner as in Example 1 except that the insertion position of the material into the rolling roll was shifted 20 mm to the right side compared to the position in Example 1. The degree of deflection was 0.48.

(Comparative Example 3) Thickness in the width direction of the product measured in the same manner as in Example 1 except that the insertion position of the material into the rolling roll was shifted 40 mm to the left side compared to the position in Example 1. The degree of deflection was 0.66.

(Comparative Example 4) When setting the position of the rolling roll during rolling using the draining method, the degree of thickness deflection in the width direction of the product measured over 30 coils was 0.36 as an average value. Met.

[0030] The degree of thickness deviation Z in the width direction of the product mentioned above is defined as the average value of the plate thickness measured in the width direction of the product, and is calculated at a point 100 mm inside from one end of the product. The plate thickness is t1, and the thickness is 1 from the other end of the product to the inside.
It was calculated using the following formula, assuming that the plate thickness at the point where 00 mm entered is t2.

Z=((t1-t2)/T)×100%

[
The above results are summarized in Table 1.

[0033]

[Table 1]

[0034] According to the present invention, it has become easy to obtain a rolled product with a low degree of thickness deviation in the width direction.

[0035]

[Effects of the Invention] According to the present invention, it becomes easy to obtain a rolled product with a low degree of thickness deviation in the width direction, and the unstable time consumed for work preparation at the start of rolling work is avoided. It also makes it easier to erase information, which will greatly contribute to the industry.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a four-high rolling mill to which the present invention is applied. 1, 2 Rolls 3, 4 Backup rolls 5, 5' Supports 6, 6' Chocks 7, 7' Roll lifting device 8, 8' Load cell 9, 11 Differential amplifier 12, 13 Display meter 10, 10' Roll 1 Neck parts 20, 20' of rolling roll 2 neck parts g1, g1' Gap between the lower end surface of the support and the reference surface S Reference surface Z1 Dimensional difference X1 Sum of applied loads (P1 + P1') Y1 Load value difference

Claims (1)

[Claims] Claim 1: A plurality of rollers that make the dimensional difference between the gap dimensions between the left and right support ends of a roll lifting device that applies a load to each of the left and right necks of a rolling roll and a reference plane the same. For each dimensional difference condition, the sum of the loads measured at the left and right necks of the rolling rolls without inserting any material between the rolls is calculated as the sum of the loads measured at the center area of the required load area during general-purpose rolling work. and another value smaller than this median value that was also specified, each time the sum of applied loads is set, it is measured at each of the left and right necks of the rolling roll. Calculate the load value difference observed between the left and right roll necks in this case from each load value, and from the fluctuation status of the calculated load value difference between the left and right roll necks, calculate the difference between the changes in the above load sum. Find the rolling conditions that minimize the absolute difference in load value difference between the left and right roll necks, and then
The dimensional difference between the dimensions of the gap between the left and right support ends of the roll lifting device and the reference plane is maintained at a dimensional difference that minimizes the variation absolute value difference of the load value difference between the left and right roll necks mentioned above. Then, the material is inserted between the upper and lower rolling rolls to proceed with the rolling process, and the insertion position of the material in the axial direction of the rolls is adjusted so that the fluctuation absolute value difference of the load value difference observed between the left and right roll necks is A method for adjusting the position of inserting a material into a rolling roll, characterized in that rolling work is performed while taking care to show a minimum value.