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Method for controlling bottom dead center of slider of oil press

A technology of hydraulic press and slider, which is applied in the field of hydraulic press control, can solve the problems of complex control structure, high maintenance cost and unsatisfactory effect of hydraulic press, and achieve the effects of easy maintenance, low equipment cost and simple operation

Active Publication Date: 2012-07-04
NANJING ESTUN AUTOMATION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The problem to be solved by the present invention is: the existing servo valve oil press control system is mainly imported equipment from abroad, which has high cost and high maintenance cost, which makes the control structure of the oil press complicated and the effect is not ideal

Method used

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  • Method for controlling bottom dead center of slider of oil press
  • Method for controlling bottom dead center of slider of oil press
  • Method for controlling bottom dead center of slider of oil press

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Experimental program
Comparison scheme
Effect test

specific Embodiment approach

[0030] 1) First set the reference deviation of the bottom dead center steady state position to 60pls, set the upper limit of the integral error to 2000, and the gain of the integral error to 1.5, both of which are used to control the output of the saturated integral; set the compensation interval time to 300ms, and set the position change of the slider The lower limit of the amount is 2pls, and this value matches the output compensation of the slider movement speed;

[0031] 2) Set the running track of the slider, including setting the distance, maximum speed, and holding time of fast down, work, unloading, return, etc.; details are shown in Table 1 and Table 2:

[0032] Table 1

[0033] slider upper limit

slider shift point

Slider lower limit

compress time

Unloading distance

10mm

320mm

360mm

1s

0.5mm

[0034] Table 2

[0035] get off

work into

unload

return journey

time

5s

3s ...

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Abstract

A method for controlling the bottom dead center of a slider of an oil press is applied to an oil press system in a servo valve control mode. The position of the slider of the servo valve oil press is controlled in a PID (proportion, integration and differentiation) manner, when the slider is switched from a work-feeding state into a pressure maintaining state, an integral error upper limit is additionally dynamically changed, the running speed and the stopping position of the slider are controlled, and repeat precision of the bottom dead center of the slider is within a range from minus 0.02mm to 0.02mm assuredly. The method solves various problems when control of the position of a slider of an oil press is actually used in the prior art, a numerical control system of the oil press does not need to be externally connected with any other auxiliary equipment, hardware configuration of the system of the servo valve oil press is greatly simplified, equipment cost is greatly lowered as compared with that of an overseas like product, operation is simple and convenient, maintenance is easy, and the control precision of the position of the bottom dead center of the slider reaches the range from minus 0.02mm to 0.02mm.

Description

technical field [0001] The invention belongs to the technical field of hydraulic press control, relates to the control of the position of a slide block of a hydraulic press, and relates to a method for controlling the bottom dead point of a slide block of a hydraulic press. Background technique [0002] The working principle of the hydraulic press is to use the slider installed on it to move repeatedly, so that the blank material is plastically deformed or separated to achieve no chips. Stopping the slider too early or too late when it runs to the bottom dead center will lead to unqualified processed products, and even lead to direct damage to the mold. Therefore, it is very necessary to accurately control the bottom dead center of the hydraulic press slider. [0003] At present, the control system of hydraulic press is mainly divided into two types: on-off valve control mode and servo valve control mode. Products that do not require high precision. The servo valve control...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B30B15/18
Inventor 郑飞徐林飞张圣韩邦海
Owner NANJING ESTUN AUTOMATION CO LTD
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