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The Study of CNC Technique for Bending Machine

Author: GaoHongTao
Tutor: WuZuoMing
School: Hefei University of Technology
Course: Mechanical and Electronic Engineering
Keywords: Bending machine Barrel distortion Deformation compensation Neural Networks Hydraulic servo control
CLC: TG385
Type: Master's thesis
Year: 2009
Downloads: 263
Quote: 8
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Abstract


With the continuous development of numerical control technology , the continuous improvement of the level of production technology , the traditional CNC bending machines become increasingly unable to meet the requirements of customers . In response to this situation , this paper proposed new method of bending machine CNC technology . In order to reduce the the barrel deformation amount generated by the bending machine at the bending processing is carried out on the plate , can be installed on the lower crossbar matrix a certain number of compensation cylinders to produce upwardly flexural deformation , which barrel distortion compensation . Compensation is directly dependent on the size of the compensation force . So first using ANSYS finite element modeling in the case of off-line in the process of bending machine on the lower beam deformation and the compensation effect of the lower beam simulation , based on access to large amounts of data , to establish a bending force and loading the length of the cylinder between the compensation force BP neural network model . After the actual processing can be online using the BP neural network has been trained , to input alternative processing parameters , can rapidly predict cylinder compensation force . Prediction results show that the prediction error in the acceptable range . Bending improve product quality must put forward higher requirements on the accuracy of the bending machine loading system responsiveness . To this end, the establishment of a mathematical model of the electro-hydraulic servo control system for the prevalence of non-linear aspects of the electro-hydraulic system and time-varying characteristics , at the same time in order to eliminate the steady-state error of the system and improve control accuracy , PID control , BP- PID control two strategies , and its simulation respectively . The test results show that the BP-PID control technology to overcome the shortcomings of the control parameters are difficult to easily encountered when using PID control tuning , so that the overall performance of the system has been significantly improved to meet the requirements of the control system . Finally , based on these new technologies , the preliminary design of the bending machine CNC system , hardware and software structure .

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metal pressure processing > Cold stamping ( sheet metal processing) > Cold punching machinery and equipment
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