CN-116532787-B - Control system and method for improving shearing precision of double-sided shears of medium plates

CN116532787BCN 116532787 BCN116532787 BCN 116532787BCN-116532787-B

Abstract

The invention discloses a control system and a control method for improving the shearing precision of double-sided shears of a medium plate, which belong to the technical field of detection systems and comprise a PLC module, a remote IO cabinet and a frequency converter, wherein the PLC module, the remote IO cabinet and the frequency converter transmission cabinet are in data communication through a Profibus-DP network, a laser marking width adjusting motor, a frame width traversing motor and a shearing edge clearance adjusting motor are in vector control through the frequency converter, and the shearing precision of the double-sided shears of the medium plate factory is greatly improved through the methods of accurate positioning control of the frame width of the double-sided shears, accurate positioning control of a laser marking device, retesting of the width of the shearing frame by a laser distance meter, laser line reference alignment and calibration of the shearing edge and the laser marking device and the like.

Inventors

LONG ZHONGYI
CHEN ZEHAO
LI SHUQING
YANG JIAN

Assignees

湖南华菱湘潭钢铁有限公司

Dates

Publication Date: 20260512
Application Date: 20230612

Claims (1)

1. The control method for improving the shearing precision of the double-sided shears of the medium plates is characterized by comprising the following steps of: Setting the positioning allowance deviation of the frame width adjustment to be-1-1.5 mm, wherein the frame width set value is a system frame width set value minus a shearing edge clearance compensation value, the compensation value is related to the thickness of a steel plate, when the thickness of the steel plate is smaller than 30mm, the compensation value is 1/2 of the clearance sum of the shearing edges of a fixed side and a movable side, when the thickness is larger than 30mm, the compensation value is 1/4 of the clearance sum of the shearing edges of the two sides, and if oscillation or overshoot occurs in a debugging stage or a production running process, parameter optimization is carried out through a frequency converter PID regulator so as to achieve quick and accurate positioning; Setting the positioning allowance deviation of the width adjustment of the laser scribing device to be-2-3 mm, wherein the given value of the width of the laser scribing is the given value of the width of the system frame minus the clearance value of the fixed side shearing edge, and if oscillation or overshoot occurs in the debugging stage or the production running process, carrying out parameter optimization through a frequency converter PID regulator so as to achieve quick and accurate positioning; Respectively installing a laser range finder at the inlet side and the outlet side of a shearing machine frame at the fixed side of the double-sided shearing machine to measure the width of the shearing machine frame, averaging the detection values of the two range finders, comparing the detection values with the reading of a machine frame width displacement sensor, and giving an alarm prompt if the detection values exceed the allowable deviation by 1mm; According to the longitudinal and transverse center lines of the base of the double-sided shearing equipment, the positions of the fixed side lower shearing edges are adjusted, the lower shearing edges are guaranteed to be parallel to the shearing center lines, the movable side lower shearing edges are adjusted to be parallel to the fixed side lower shearing edges, the allowable deviation is within 1mm, the light rays emitted by the laser scribing device fixed side lasers are adjusted to be coincident with the double-sided shearing fixed side lower shearing edges, the fixed side laser lines are 16mm away from the roller table edge as a reference, namely, the fixed side laser lines are considered to be coincident with the fixed side lower shearing edges, the light rays emitted by the laser scribing device fixed side lasers are adjusted to be parallel to the light rays emitted by the laser scribing device movable side lasers, the physical measured distances of the frame width and the laser scribing width are compared with sensor values at regular intervals, and systematic errors are eliminated, so that the shearing precision is guaranteed.

Description

Control system and method for improving shearing precision of double-sided shears of medium plates Technical Field The invention belongs to the technical field of detection systems, and particularly relates to a control system and a control method for improving shearing precision of double-sided shears of medium plates. Background The double-sided shear is one of important equipment for shearing lines in medium plate factories, and has the main function of shearing longitudinal edges of steel plates so that the width of the steel plates reaches a target width value, and consists of two shearing frames on a fixed side and a movable side, wherein the shearing frames on the movable side can be adjusted through a transverse moving mechanism so as to be consistent with the target width of the steel plates to be sheared. In order to cut steel plates with different widths, the combination of a magnetic centering device and a laser scribing device is used for centering the steel plates to be cut before the double-sided shears cut, so that the steel plates to be cut are longitudinally parallel to the shearing blades, and redundant waste edges on two sides of the laser scribing can be cut. The pinch rolls of the bilateral shears clamp steel and synchronously convey the steel plate with the inlet and outlet roller ways to advance according to a specific step length, and the upper shearing blades on the fixed side and the moving side roll and shear the steel plate in the sinusoidal movement process. The width shearing precision of the double-sided shears is affected by factors such as a shearing edge datum line, a laser scribing device datum line, a shearing edge gap, a frame width control positioning control, a laser scribing device width control positioning control and the like, so that the width shearing precision of the double-sided shears in China is generally more than 10mm at present, and how to ensure the minimum steel plate width allowance and the width meeting requirements is an industrial problem to be solved urgently in medium plate factories. Disclosure of Invention Aiming at the defects existing in the prior art, the embodiment of the invention aims to provide a control system and a method for improving the shearing precision of double-sided shears of medium plates so as to solve the problems in the background art. In order to achieve the above purpose, the present invention provides the following technical solutions: a control system and a method for improving shearing precision of double-sided shears of medium plates, wherein the system comprises a PLC module, a remote IO cabinet and a frequency converter, data communication is carried out among the PLC module, the remote IO cabinet and a transmission cabinet through a Profibus-DP network, detection components comprise an absolute value encoder and/or a displacement sensor and/or a laser range finder, the detection components are connected to an ET210 station of the remote IO cabinet through the Profibus-DP network for data communication, and a laser scribing width adjusting motor, a rack width traversing motor and a shearing edge gap adjusting motor are subjected to vector control through the frequency converter. A control method for improving shearing precision of double-sided shears of medium plates, comprising the following steps: Setting the positioning allowable deviation of the frame width adjustment to be +/-1-1.5 mm, wherein the frame width set value is a secondary system frame width set value minus a shearing edge clearance compensation value, the compensation value is related to the thickness of a steel plate, and when the thickness of the steel plate is smaller than 30mm, the compensation value is 1/2 of the clearance sum of the shearing edges of a fixed side and a movable side, when the thickness is larger than 30mm, the compensation value is 1/4 of the clearance sum of the shearing edges of the two sides, and if oscillation or overshoot occurs in a debugging stage or a production running process, parameter optimization is carried out through a frequency converter PID regulator so as to achieve quick and accurate positioning; setting the positioning allowance deviation of the width adjustment of the laser scribing device to be +/-2-3 mm, wherein the given width value of the laser scribing is the given width value of the two-stage system double-sided shearing machine frame minus the clearance value of the fixed side shearing edge, and if oscillation or overshoot occurs in the debugging stage or the production operation process, carrying out parameter optimization through a frequency converter PID regulator so as to achieve quick and accurate positioning; Respectively installing a laser range finder at the inlet side and the outlet side of a shearing machine frame at the fixed side of the double-sided shearing machine to measure the width of the shearing machine frame, averaging the detection values of the two range finders, comparing the det