Design And Research Of The Hydraulic System For The Main Spindle Box Of Floor Type Boring And Milling Machine

As one kind of high efficiency and accuracy equipment, floor type boring and milling machine plays an extremely important role in modern industrial production. It’s mainly and widely used during the fabrication of large and complex workpieces such as the shells of water wheel generator and air compressor.This paper is written based on the designing of hydraulic system for HTM-F1-160floor type boring and milling machine of HaiTian Machine tool Corporation, making research on the application of electrohydraulic proportional technology in balancing and compensating of main spindle box of large floor type boring and milling machine, exploring the method of compensating the ram’s droop. All of these technologies ensure the machine tool working well duing boring and milling workpieces. This paper is organized as follows:Relevant background information is presented in Chapter1. This chapter includes a review on the present development situation and tendency of floor type boring and milling machine. A review on the development of electrohydraulic proportional technology is then presented.Chapter2compares some commonly used methods for the up-and-down moving component of machine tools. Then the design and calculation of the hydraulic system is presented base on the working demands of the main spindle box.The analysis and calculation of relevalant parameters for accumulator balancing system is also described.Chapter3analyses the reasons for the ram’s droop during moving out. Then measures for eliminating the ram’s droop is described. The design and calculation of hydraulic compensating system is presented base on the working demands. Besides these, the displacement transducer and proportional amplifier used in this system are also described.In chapter4, modeling and simulation using DSHplus is carried out to check the designs. The same model is also built inSimulink based on differential equations rather than traditional transfer function to compare the difference between the two softwares.Chapter5introduces the application of tuning PID parameters using relay feedback method based on amplitude and phase margin. Then co-simulation between Simulink and DSHplus testes the effectiveness of this algorithm.The final remarks and conclusions are included in Chapter6. In addition, the chapter ends up with a brief list of possible extensions of this research and future work.