Research And Development Of Control System Of Numerical Control Machine Rolling Functional Components Test-bed

With the rapid development of mordern manufacturing industry, Vertical Machining Center(VMC) plays an increasingly critical role in the aerospace, energy, military and other basic industries. As key functional component of VMC, the accuracy of rolling components(including ball screw and linear rolling guide) directly influences the machining accurauy and efficiency. It is necessary to develop the test equipment of stability of accuracy which can obviously improve the accuracy of rolling components.At present,although the test datas of domestic test equipments of rolling components, mostly workingunder condition of the only workbench weight or adding external load by counterweight, have certain reference values, they still havea large gap compared with the real machining environments at present.Although test on the precision, displacement and temperature rise of ball screw and linear guide in real machining conditions ensures the accuracy of the test data, it also not only causes cutter wear and consumes a large amount of energy, but also wastes a lot of materials. Therefore, this topicmakes comprehensive analysis of rolling components in vertical milling conditions, and makes research of the controlsystemand key technologies of accuracy stable test-bed.In order to simulate the stresses of workbench in vertical milling process, this topicdesigns a set of force-applying mechanism and makes use of the the principle of the force and moment equal to deduce the functional relationships between the force of mechanism applying and the milling force.According to the working principle of force-applying mechanism, this topicmakes mathematical modeling for each simulation force formula,and finds that when the feed direction of milling cutter mutates,the simulated force will also mutate through analysis of the relationships.Force-applying mechanism can’t achieve the mutation until rounded corners can be added in the position where feed direction mutates.To solve the complex control problems of accuracy stable test-bed, this topic adopts the “PC+NC” control system architecture and completesthe design anddevelop of the testing stand open control system. In the process of the test of perfomace parameters by testing-bed, the force-applying mechanism apply milling force which could not only ensure test data accuracy but also save energy and raw materials.