Application Of Fuzzy Control To TR All Fiber Upsetting Machince

With the development of China's shipbuilding industry,the quality of marine crankshaft can directly affect the safety and reliability of the ship.Therefore,the ship crankshaft is called the "heart" of the ship engine.The marine crankshaft is made by upsetting and forging machince.Controlling the final stopping position of left and right half mould is the key to the problem.The upsetting and forging machince which used traditional manual controlling way can't reach performance indicators and accuracy requirements,the forging finished size precision in the process of actual production is not stable and not up to the requirements that will cause mould "clamping" or TR(Tadeusz Rut)all fiber upsetting and forging machince mold damaging and reduce the benefit of enterprises.To solve the above problem,the whole forging industry is developing towards automation and intelligent trend,this paper designs a fuzzy control system based on MITSUBISHI FX3U programmable controller,this control system can improve the degree of automation,safety and reliability of TR all fiber upsetting and forging machince,reduce the difficulty of debugging and improve the yield of crankshaft.This paper makes a prediction and research on the development of distance adjustment controlling technology of TR all fiber upsetting and forging device,and puts forward its own controlling plan,the key issues of upsetting machince:first we have to analyze the affect of finished forging size precision,we can get data by measuring the left and right distance between moulds when upsetting machince stopping and the left and right distance between moulds when upsetting machince eventually stopping under different forging temperature,and get fitting curve and the corresponding quadratic polynomial function by applicating least squares curve fitting.This paper analyzes the influence of forging temperature on the control of the upsetting and forging machince and then puts forward the calculation method of the distance between two moulds when the hydraulic press stops working for the first time.Second,fuzzy control theory is applied to the control system,the distance bias between moulds and the forging temperature are taken as fuzzy variables,fuzzy control rule table and fuzzy control inquiry table are set up which makes the control system more safe and stable.Then automatic control of the final stopping distance between left and right half mould turns into reality.Based on the design scheme,the design of hardware and software for controlling the distance between moulds of all fiber upsetting and forging machince is completed.On the one hand,the hardware system includes MITSUBISHI PLC,touch screen,sensors,tepping motor and other machinces,On the other hand,the design of the software system including calculating mould distance program,first time to run program,stepping motor running program with manual mode and upsetting and forging machince automatic controlling program is completed.Through laboratory and on-site debugging,in the case of the mould final stopping distance,the upsetting and forging machince control system can meet the precision requirement.After practical engineering application,the system has the benefit of excellent precision controlling,simple operation,and high safety performance,so it meets the requirements of the control engineering.