Study On Machining Error-Driven Design Method Of CNC Gear Shaper

Gear machine is critical manufacturing equipment in many industries, such as national defense industry, aerospace industry, chemical industry, metallurgical industry and mining industry etc.. Having characteristics of complex function and structure, gear machine is a typical complex mechanical multi-body system. Satisfying machine is hard to be designed using design method lacking system-level design optimization and method based on traditional experiences. Therefore, it is urgent to do the work of finding advanced design theory and methods to guide and improve machine design.Based on analyzing performance of gear machining system and mechanism of machining error, the description method of machining error was presented for gear machine. According to the performance-driven design concept and generalized multi-body certainty theory, driven by gear machining error, machining error fine model and system integrated design method of CNC gear shaper was studied.In this dissertation, research work and results are as follows:1. Performance of CNC gear machine and gear error was analyzed. Causes inducing gear machining error and mechanism forming tooth surface geometrical error was studied. Consistency evaluation criteria of gear geometrical machining error calculated on the gear meshing line was identified.2. Combining the generalized certainty multi-body system theory with gear meshing theory, considering the behavior characteristics of CNC machine tools and gear-processing requirements, the multi-body system model describing double-strand configuration of gear machine was established according to concept movement configuration and typical errors of gear shaper.3. The multi-body model based on tool-workpiece subsystem was established by analyzing the geometric characteristics and mating characteristics of involute spiral surface during slotting. Shaper processing error model was thus obtained. Combining the generalized multi-body system kinematics theory with the discrete analytic principle of conjugate surface, the solution of machining error was completed.4. According to transmission chain characteristics of CNC machine system, the accuracy of transmission chain and its influence on gear machining error was analyzed. The meshing line incremental error model reflecting machining error was established by combining the transmission chain error model with the differential geometry principle of plane gear meshing.5. Based on the above theoretical results and iSIGHT software integration platform, design method and system integration software framework was put forward. The product design example of YK51200 CNC gear shaper was used to illustrate the effectiveness and practicality.