Method for on-line drafting elastic curve of rolling mill

A technology of elastic curves and rolling mills, which is applied to the program control and electrical program control of sequence/logic controllers, and can solve problems such as difficult to meet precision work efficiency and reduce control precision

Inactive Publication Date: 2009-07-01
上海欧达电气成套设备工程有限公司 +1
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0006] Obviously, although the above method is simple, it needs to calculate the rolling mill rigidity coefficient off-line and idealize it as a constant, which undoubtedly reduces the control accuracy; And guarantee the requirements of work efficiency

Method used

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Examples

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Embodiment Construction

[0011] When the rolling mill is rotating under no load, press the zero calibration button on the main console, and the hydraulic cylinder will automatically depress. When the actual pressure in the cylinder on the drive side and operating side of the roll reaches the set pressure value , Record the actual roll gap value on both sides at this time, and use this as the roll gap zero position, the pressure value at this time is the minimum pressing setting value; after finishing the above work, increase gradually according to the set pressure step. Large pressing pressure value, and automatically record the average value of the actual roll gap on both sides of each pressure step during the stable stage, until the pressing pressure reaches the set maximum value, and then automatically return to the set minimum value to complete the entire automatic pressing Then, the elasticity curve of the rolling mill is simulated in the digital control system PLC through the point method; according...

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PUM

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Abstract

The invention discloses a method of on-line drawing an elastic curve for rolling mills. Based on the principle of the known pressing process, the method utilizes the pressing process to measure relative data of roll-gap spring rate and rolling force, collects the data measured on-line in real time to store in a digital control system PLC, utilizes the tracing point method to analog an elastic curve of a rolling mill in the digital control system PLC, and then operates stiffness coefficient and spring rate of the rolling mill under any roll-force through a piecewise linear method by aid of the elastic curve of the rolling mill. The method of on-line drawing an elastic curve for rolling mills not only finish the conventional pressing return-to-zero work, but can fast on-line analog the elastic curve of the rolling mill and precisely compensate the spring rate of the rolling mill in real time, thereby overcoming the defects of poor precision and low efficiency of the known pressing process.

Description

Technical field: [0001] The invention relates to an automatic control technology for the thickness of a steel plate in the metallurgical industry, in particular to a method for drawing an elastic curve of a rolling mill online. Background technique: [0002] In the production process of cold rolled strip in the metallurgical industry, the thickness of the rolled strip can be controlled by changing the gap between the rolls. Assuming that the rolling mill stand and roll system have infinite rigidity, the thickness of the strip exit will be equal to the roll gap set at no-load. But in fact, the stand and the roll system not only have limited rigidity, but there are also gaps between the roll systems, so the elastic deformation of the rolling mill is a variable amount under the action of different rolling forces. In order to obtain a high-precision strip, it is necessary to accurately calculate the elastic deformation of the rolling mill to eliminate the influence of the frame bounc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B19/05
Inventor 陈广达许幸福
Owner 上海欧达电气成套设备工程有限公司
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