阅读说明：本技术 一种同一冷轧钢带轧制不同厚度的方法 (Method for rolling different thicknesses by same cold-rolled steel strip ) 是由 王海明 史超 张建发 王少炳 丰小东 于 2021-08-05 设计创作，主要内容包括：本发明公开了一种同一冷轧钢带轧制不同厚度的方法,采用往复式轧制过程,通过多次重新标记张力缸行程位置改变轧制变形区域,从而在同一件冷轧原料得到多种厚度试样,用以力学性能等对比研究。本发明的方法成功实现了同一块试验料生产不同厚度规格试样,更加有利于性能的比较。(The invention discloses a method for rolling different thicknesses by the same cold-rolled steel strip, which adopts a reciprocating rolling process and changes a rolling deformation area by repeatedly marking the stroke position of a tension cylinder again, thereby obtaining multiple thickness samples on the same cold-rolled raw material for the comparative study of mechanical properties and the like. The method successfully realizes that the same test material can be used for producing test samples with different thickness specifications, and is more beneficial to performance comparison.)

1. A method for rolling different thicknesses of the same cold-rolled steel strip is characterized in that: the method comprises the following steps:

s1, strip steel sample feeding

Lifting the roll gap to enable the strip steel to pass through the roll, clamping a strip steel sample by using a clamp of a tension cylinder at one side, controlling the tension cylinder at the clamping side to stretch out for feeding, rotating the roll at a low speed to enable the strip steel to pass through the roll smoothly, feeding the strip steel to a limit position by using the tension cylinder, and stopping stretching out of the tension cylinder and stopping rotating the roll; stretching out the tension cylinder clamp device on the other side to clamp the sample, and firmly clamping the sample by the tension cylinder clamps on the two sides; the initial roll gap is set, the pressing knob is controlled to pre-press strip steel, the rolling force is observed, the tension setting is adjusted, the tension cylinders on the two sides output the tension of the strip steel, the strip steel is straightened, and the feeding is finished;

s2, selecting the operation mode of the rolling mill,

selecting a linkage mode to synchronize the rotation linear speed of the roller and the horizontal moving speed of the tension cylinder;

limiting and resetting the tension cylinder to output the full stroke of the tension cylinder, thereby realizing the rolling of the strip steel in the maximum deformation area;

first thickness rolling: and gradually adjusting the rolling reduction, and rolling to a first thickness specification through multiple passes. As shown in fig. 3.

Rolling for the second thickness: and calibrating the stroke position of the tension cylinder again, determining a second thickness rolling area, gradually adjusting the reduction, and rolling the second thickness specification for multiple times. As shown in fig. 4.

Rolling for the third thickness and the fourth thickness: repeating the stroke position of the tension cylinder and adjusting the rolling reduction for rolling to realize rolling of a third thickness specification and a fourth thickness specification;

s3, unloading

And resetting tension setting, selecting a single-action mode, lifting a roll gap, loosening a clamp of a tension cylinder on one side, rotating a roll, simultaneously returning a clamp of a tension cylinder on the other side, withdrawing the strip steel from the rolling mill, loosening the clamp, taking off the finished product of the strip steel, and finishing the thickness-variable rolling.

2. Method for rolling different thicknesses from one and the same cold-rolled steel strip according to claim 1, characterized in that: and removing surface iron scales of the strip steel sample by acid washing before feeding to show the natural color of the steel.

3. System for carrying out the method for rolling different thicknesses of the same cold rolled steel strip according to claim 1, characterized in that: the system comprises a four-roller reversible experimental rolling mill, a matched PLC control system, a process machine and an HMI (human machine interface) system; the HMI human-computer interface system is used for monitoring the sample rolling process, changing process parameters and carrying out sample reciprocating rolling through an operation button; and the PLC control system is used for acquiring rolling process data and accurately controlling the rolling speed of the strip steel, the thickness reduction and the stepping position of the tension cylinder according to an operation instruction.

Technical Field

The invention relates to the field of steel rolling control, in particular to a method for rolling different thicknesses by using the same cold-rolled steel strip.

Background

At present, patent application No. 201310478174.4 discloses a method of rolling a cold rolled steel strip. The invention sets a straightening machine straightening belt head before the original mill housing, sets a CPC centering device on an uncoiler to center the belt material to enter the mill housing for rolling, the main mill is a six-roller mill with upper and lower middle rollers having axial transverse movement function, upper and lower working rollers having positive and negative roll bending function, adds an AGC hydraulic pressure down control system on the main mill and sets an X-ray thickness gauge respectively before and after the main mill, sets a vacuum oil removing device respectively before and after the main mill, sets two rows of air knives respectively before and after the main mill. The acid-washed steel strip is rolled through five steps of uncoiling preparation, threading rolling, reversible rolling, finished product rolling and uncoiling, the technical problems that the working roll needs original convexity, the diameter of the working roll is difficult to reduce, the roll bending cannot be effectively exerted, the stock of the standby working roll and the roll consumption are increased and the like are solved, and the thickness control precision and the plate surface cleanliness are improved.

The patent application No. 201410148617.8 discloses a control method for thickening and rolling the head of cold-rolled steel strip. The method judges in real time through an industrial computer, and if the set rolling thickness of the current steel coil is less than 0.3mm, when the head of the cold-rolled strip steel runs to a distance within 4m from a first cold-rolling mill, the thickness value of 0.25mm is automatically increased on the basis of the set rolling thickness value of the strip steel; 2) converting the thickness value into an additional speed factor of a cold rolling mill through an industrial computer, inputting the additional speed factor into a speed ramp generator program module, generating a speed output value of each rolling mill, controlling the speed of each rolling mill, and automatically thickening and rolling the head of the strip steel; 3) and when the distance between the head of the strip steel and the last cold rolling mill is more than 15m, the thickening rolling of the head of the strip steel is automatically stopped, and the rolling thickness is recovered to the set value thickness issued by the industrial computer database. The problem of because of the operation workman manually selects the thickening rolling of cold rolling strip steel head, produce artificial judgement error easily, appear even forgetting to select the thickening of strip steel head, make strip steel head undersize, hardness not enough, twine on the coiling machine, can't lift off the coil of strip, can only cut and destroy the coil of strip, both extravagant finished product coil of strip, consume mass production time again is solved.

The patent application No. 201710014476.4 discloses a rolling method for cold rolling a variable thickness sheet. The invention comprises the following steps: (1) setting a target profile of a finished plate to be rolled; (2) setting the number of rolling passes and the reduction of each pass in the rolling process according to the specification of incoming materials, the target profile of a finished plate and the capacity of a rolling mill; (3) setting a target plate shape of each pass; (4) and (4) carrying out variable thickness rolling on the incoming material in each pass. The method can ensure the plate shape and the surface quality of the strip by sharing the reduction through a plurality of (more than or equal to 2) passes, is particularly suitable for rolling the variable thickness product with the thickness difference close to 50 percent, and meets the requirement that the reduction of the thin area and the thick area reaches the critical deformation. The problem of current variable thickness sheet material rolling can't guarantee plate shape and surface quality is solved.

Disclosure of Invention

The invention aims to solve the problems of repeated feeding and discharging in the rolling process and incapability of providing test samples of the same material and different thickness specifications due to shortage of raw materials.

In order to solve the technical problems, the invention adopts the following technical scheme:

a method of rolling different thicknesses of the same cold rolled steel strip comprising:

s1, strip steel sample feeding

Lifting the roll gap to enable the strip steel to pass through the roll, clamping a strip steel sample by using a clamp of a tension cylinder at one side, controlling the tension cylinder at the clamping side to stretch out for feeding, rotating the roll at a low speed to enable the strip steel to pass through the roll smoothly, feeding the strip steel to a limit position by using the tension cylinder, and stopping stretching out of the tension cylinder and stopping rotating the roll; stretching out the tension cylinder clamp device on the other side to clamp the sample, and firmly clamping the sample by the tension cylinder clamps on the two sides; the initial roll gap is set, the pressing knob is controlled to pre-press strip steel, the rolling force is observed, the tension setting is adjusted, the tension cylinders on the two sides output the tension of the strip steel, the strip steel is straightened, and the feeding is finished;

s2, selecting the operation mode of the rolling mill,

selecting a linkage mode to synchronize the rotation linear speed of the roller and the horizontal moving speed of the tension cylinder;

limiting and resetting the tension cylinder to output the full stroke of the tension cylinder, thereby realizing the rolling of the strip steel in the maximum deformation area;

first thickness rolling: and gradually adjusting the rolling reduction, and rolling to a first thickness specification through multiple passes. As shown in fig. 3.

Rolling for the second thickness: and calibrating the stroke position of the tension cylinder again, determining a second thickness rolling area, gradually adjusting the reduction, and rolling the second thickness specification for multiple times. As shown in fig. 4.

Rolling for the third thickness and the fourth thickness: repeating the stroke position of the tension cylinder and adjusting the rolling reduction for rolling to realize rolling of a third thickness specification and a fourth thickness specification;

s3, unloading

And resetting tension setting, selecting a single-action mode, lifting a roll gap, loosening a clamp of a tension cylinder on one side, rotating a roll, simultaneously returning a clamp of a tension cylinder on the other side, withdrawing the strip steel from the rolling mill, loosening the clamp, taking off the finished product of the strip steel, and finishing the thickness-variable rolling.

Further, the method also comprises the step of removing surface iron scale of the strip steel sample through acid washing before feeding, and displaying the natural color of the steel.

A system for realizing the method for rolling different thicknesses by the same cold-rolled steel strip comprises a four-roller reversible experimental rolling mill, a matched PLC control system, a process machine and an HMI (human machine interface) system; the HM I human-computer interface system is used for monitoring the sample rolling process, changing process parameters and carrying out sample reciprocating rolling through operating buttons; the PLC control system is used for collecting rolling process data and accurately controlling the rolling speed of the strip steel, the thickness reduction amount, the stepping position of the tension cylinder and the like according to an operation instruction.

Compared with the prior art, the invention has the beneficial technical effects that:

in the reciprocating cold rolling process, after an experimental steel strip is rolled to a required first thickness specification, the initial position of a tension cylinder is marked again, the position of a second (or a few) deformation area is changed, and the second (or a few) thickness rolling is carried out according to a pre-designed process, so that products with different thickness specifications are produced by the same raw material, a series of repeated rolling operation processes such as feeding, roll gap adjustment and the like are solved, meanwhile, the problem that products with various thickness specifications are rolled by the same cold rolling raw material under the condition that the cold rolling raw material is in short supply is solved, and samples with different compression ratios of the same raw material are provided for researches such as mechanical property, tissue property and the like.

The test materials of the same block are successfully produced into test samples of different thickness specifications, and the performance comparison is facilitated.

Drawings

The invention is further illustrated in the following description with reference to the drawings.

FIG. 1 is a layout view of a cold rolling mill;

FIG. 2 is a cold rolling loading diagram;

FIG. 3 is a schematic view of rolling a first thickness;

FIG. 4 is a schematic view of the recalibration rolling of the second thickness;

FIG. 5 is a schematic view of a third thickness of the recalibration rolling;

FIG. 6 is a schematic diagram comparing the specification of the finished product with that of the raw material.

Detailed Description

A method for rolling different thicknesses of the same cold-rolled steel strip comprises the following cold-rolling experimental technological processes:

acid cleaning → clamping and feeding → pre-pressing → tension setting → linkage synchronous selection → calibration of rolling area → adjustment of rolling reduction for reciprocating rolling of first thickness → recalibration of second rolling area → adjustment of rolling reduction for reciprocating rolling of second thickness → repetition of the above process for rolling to Nth thickness → tension return to zero → lifting roller gap → single action selection → release tension cylinder discharge → rolling completion.

The specific technical scheme is as follows:

a four-roller reversible experimental rolling mill is adopted, and is arranged as shown in figure 1, and a PLC control system, a process machine and an HMI (human machine interface) system are matched. And the human-computer interface monitors the sample rolling process, changes process parameters and performs sample reciprocating rolling by operating a button. The PLC system collects rolling process data and accurately controls the rolling speed of the strip steel, the thickness reduction amount, the stepping position of the tension cylinder and the like according to an operation instruction. The specific operation process is as follows:

and removing the surface iron scale of the strip steel sample by acid cleaning to show the natural color of the steel.

Strip steel sample feeding:

and lifting the roll gap to enable the strip steel to pass through the roll, clamping a strip steel sample by using a clamp of a tension cylinder at one side, controlling the tension cylinder at the clamping side to stretch out for feeding, rotating the roll at a low speed to enable the strip steel to pass through the roll smoothly, feeding the strip steel to a limit position by using the tension cylinder, and stopping stretching out of the tension cylinder and stopping rotating the roll. And stretching out the tension cylinder clamp device on the other side to clamp the sample, wherein the tension cylinder clamps on the two sides firmly clamp the sample. The initial roll gap (namely the thickness of the raw material) is set, the pressing knob is controlled to pre-press the strip steel, the rolling force is observed to be about 100kN (the pre-pressing rolling force is reasonably adjusted according to the material of the strip steel), the tension is set, the tension cylinders on two sides output the tension of the strip steel, the strip steel is straightened, and the feeding is completed. As shown in fig. 2.

Selecting the operation mode of the rolling mill:

the control button selects a linkage mode to synchronize the rotation linear speed of the roller and the horizontal moving speed of the tension cylinder.

And the tension cylinder is limited and reset, so that the tension cylinder is output in a full stroke, and the rolling of the strip steel in the maximum deformation area is realized.

And (4) rolling to the first thickness, gradually adjusting the reduction and rolling to the first thickness specification through multiple passes. As shown in fig. 3.

And (4) rolling by a second thickness, calibrating the stroke position of the tension cylinder again, determining a rolling area of the second thickness, gradually adjusting the reduction, and rolling the second thickness specification by multiple passes. As shown in fig. 4.

And (3) rolling in the third and fourth thicknesses, and repeating the stroke position of the tension cylinder and the adjustment of the rolling reduction to roll so as to realize the rolling in the third and fourth thickness specifications. As shown in fig. 5.

Unloading:

and resetting tension setting, selecting a single-action mode by a control button, lifting a roll gap, loosening a clamp of a tension cylinder on one side, rotating a roll, simultaneously returning a clamp of a tension cylinder on the other side, simultaneously withdrawing the strip steel from the rolling mill, loosening the clamp, taking off the finished product of the strip steel, and finishing the thickness-variable rolling. The rolled product and stock pair is shown in fig. 6.

The key point of the implementation of the cold rolling experiment process is that after the first thickness specification is rolled, the positions of the left and right single-side tension cylinders are calibrated again, and as shown in figure 4, the newly calibrated positions of the single-side tension cylinders are equal to the length size of a sample required by subtracting the required first thickness from the current position of the tension cylinder. And calibrating the second and third thickness rolling areas in the same way.

The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.