Dynamics analysis and timecontrol on 40 tm liquidair hammer
FANG Guihua1, LU Jinnan1, CHEN Liangwu1, WANG Zhuo2,HU Yanli3
(1.Department of Mechanical Engineering, Inner Mongolia Technical University, Baotou 014010, China;2. Liaoning Administration College of Police and Justice, Shenyang 110161, China;3.Northern Heavy Industries Group Co. ,Ltd., Shenyang 110141 ,China)
Abstract:   In order to solve the problem that it is  unable to fulfill shortdistance strike of 40 tm liquid air hammer, the programmable logic controller (PLC) technology was applied to the control system of liquidair hammer. Analysis of beating process dynamics in liquidair hammer was done, the relationship of hammerhead falling time and hammer bouncing time was established at different beating heights, the split time logic control method of beating process was presented. To ensure that on the basis of unchanged of technology requirements, the set time value of different beating phases was evaluated, it was gotten that set from the beginning to the end of forging process in total of more than 5 000 times experiments .The experimental results show that forging process does not appear owe beating and continuous beating phenomenon, and the set time value is similar with the theoretical value.

Key words:  liquidair hammer；programmable logic controller(PLC)；dynamics analysis; simulation；timer module