| Twin-spindle CNC turning center have two spindles，the work-piece can achievethe docking transfer autonomously in the non-stop state, so that all or most ofmachining contents are completed, these are fully reflect high-precision，high-speed andcomposite machining of the CNC machine. In recent years, Twin-spindle CNC turningcenter has been widely used in the automobiles，machine tools，aerospace，textile，electrical connectors and other industries.Twin-spindle CNC turning center is a typical mechatronic product. Its research hasbeen covered multiple disciplines. In this paper， firstly, we elaborate on thedevelopment history and current status of the twin-spindle CNC turning center，andpoint out the direction of development and technical difficulties. Secondly, the reasonsthat vice-spindle is easily produced flexible impact are analyzed，and the harms tomachine tools caused by the shock and vibration are described, thus, an optimizationmethod of segmented acceleration-deceleration is proposed, to be used for vice-spindlemotion law. Through study the acceleration and deceleration control algorithm for CNCsystem, then used the S-shape acceleration and deceleration control the movement ofthe vice-spindle, and using Matlab for simulation. Based on analytical result’s problem,the method of taking use of trigonometric function to construct segmentedacceleration-deceleration function of principle spindle is proposed, and the modelconcerning acceleration-deceleration algorithm of trigonometric function is deduced.Through the simulation, proving that the vice-spindle’s acceleration, jerk is smooth andcontinuous by adopting the acceleration-deceleration algorithm of trigonometricfunction, driving force is not mutation, so the flexible impact resulted form the vicespindle to the transmission system can be avoided.Simultaneously, research on the multi-axis synchronous control of machine tools isstudied, and the problem of synchronous compensator algorithm is analyzed. Becausethe error of the synchronous speed control will affect the quality of the work-piece’smachining in the process of gripping, in order to avoid the vice-spindle’s chuck scratchwork-piece’s machined surface, the technical program of the vice-spindle’s slave-drivensynchronization is proposed. Finally, analyzed the characteristics of wear-resistant materials, and established the basis of it’s selected for the vice-spindle slave-drivenprogram requirements, and provides a theoretical reference for further research. |
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