Design And Research On The System Of Gear-grinding Machining Errors And Compensation

In theory, gear-grinding is a kind of particular cutting method and can improve the dentiform precision of gear furthest regardless of the precision and hardness before the grinding. But, there exists some problems such as complicated kinds of machining errors and low efficiency influenced by many kinds of factors.The machining errors of gear that relate to the nature of involute are studied with gear engagement theory and combining grinding-machining in this paper and they are summarized as transmission errors, axle relative position errors and cutter errors. The essential theoretic-basis has been established by the above analyses in the face of theoretic-study of error-compensation caused in the gear-machining.On the basis of the theoretical study, combining the developing condition with regard to gear grinder at home and abroad, the necessity and possibility of transformation on gear grinder with numerical control technology are discussed as well as the whole transformating scheme is designed. In this scheme , the paper studies the compensation - system of gear-grinding errors mainly. In this system, the accumulative errors of tooth pitch of the left and right sides are taken for controlling and compensating object, the computer is used as control unit, step motor as the acting part and the primary generating and graduated chains of the machine tool are used. The designed compensation system in this paper not only provides an effective approach of mecha-electricalintegration for transformation of old and wide-large gear grinder but also has special meaning with regard to the machining of large-type gear , hard-dentisurface gear and all kinds of machining-gear cutters.With regard to software-design, VBA established on the plarform of AutoCAD and having strong drawing function are applied in this paper. The motion-analysis and dynamic-state-simulation of generating-transmitting train(Y7125~type gear-grinder) are developed and the model-building and compensation- arithmetic of compensation system of gear-grinding machining-error are studied in depth with VBA.