Research On The Technologies Of Automatic Dynamic Balance In Turning And Broaching Process Of Crankshaft

The roughing and semi-finishing machining of the crankshaft spindle neck and crankpin is more time-consuming process. Over the years, the crankshaft manufacturers at home and abroad is in the search for the best processing methods. Has emerged turning, inside milling, outside milling, turning and broaching and other processing technologies. At present, the more popular one is turning and broaching processing technology .In the turning and broaching processing technology when we process crankpin cylindrical, we take crankpin cylindrical to center of rotation, but in theory, the quality central axis of the crankshaft is the central axis of the crankshaft spindle, Without the existence of dynamic balance to deal with a lot of centrifugal force of inertia, and the higher machine speed the greater the inertia force. In the paper, we mainly research automatic dynamic balancing issues in the turning and broaching process of the crankshaft.First of all, the thesis makes a research on the dynamic balance theory, including the dynamic balance of the rigid rotor, influence coefficient method and the automatic dynamic balance theory. Basing on these theories, we propose the total design of the automatic dynamic balance system about the spindle series.Secondly, we design the dynamic balance testing system, including initial dynamic balance of the spindle series, the composition of the testing system and the choice of components. Analysis of the characteristics of vibration signals, sampling and analysis of the signal. Using two-sided influence coefficient method to look for the relationship between imbalances and amplitude, and calculate the phase of testing location. Introduced the method of digital signal processing, we obtain the amplitude and phase signals by signals related conversion.Once again, we design the automatic balancing device, mainly design the structure of it and choose power supply. We design an automatic dynamic balance system based on LabVIEW platform. We design the functional modules in the computer to control data acquisition, signal processing and display the results, and then transmit the data to the controller to control the motors's movement to achieve the dynamic balance of the spindle series of machine tool.The automatic dynamic balance system the thesis studied is simply operated and has high precision, which can realize the crankshaft processing real-time automatic dynamic balancing. It can satisfy the requirements of production, and has good practical value and broad market prospects.