| Gear is an important transmission element in mechanical manufacturing, it hasthe features of constant power output, heavy loadings, high transmission efficiency,long operating life, stable transmission ratio, and compact structure, etc. Due to itsimportant role in mechanical transmission and the complexity of its form, the designand manufacturing level of gears has become one of the symbol of modern industrylevel of a country, and become the research hotspot in academe too. Thus, it is ofgreat theoretic and realistic significance to research on correlative technology ofgears.In order to improve the machining precision, the cause occurred in the gearmachining process must be studied. The influence of transmission error by drivechain of machine tools is the most obvious in all the influence factors of the gearmachining precision. To gear machine tools , it must be hold that the stricttransmission ratio between the cutter and the workpiece. The transmission ratio iskept by the drive chain. It is very great of the influence by the transmission precisionto the gear machining quality. Taking drive chain of CNC gear shaper YK5120 asresearch object, some issues are studied in this paper.1 According to the specific movement of CNC gear shaper, each of thecomponents in the drive chain of CNC gear shaper has been analyzed , the formula ofthe working table's revolving error and the cutter's revolving error have been derived,from which, the synthesis error formula and the greatest synthesis error formula ofdrive chain of CNC gear shaper have been obtained. As an instance, CNC gear shaper hasbeen analyzed;2 Considering the influence of axial runout, radial runout and accumulatedpitch error of gear, the linearity error of drive chain has been derived and convertedinto the influence of the angle error, from which, the rotational error of the workingtable and the cutter can be obtained. As an instance, CNC gear shaper has beenanalyzed;3 A simple introduction of the transmission precision of CNC gear shaper hasbeen given, some methods and measures of improving transmission precision havebeen brought forward. Especially the method of the adjustment according to the phasehas been introduced. As an instance, CNC gear shaper has been analyzed;4 The measurement and compensation of principal axis rotating error of CNCgear shaper and the process experiment of gear has been done on CNC gear shaperYK5120. In this experiment, double frequency laser interference equipment ML 10,Renishaw/RX10 rotary table and other optical units are used. Gear machining testshave been done under the condition of compensation and uncompensation. Theexperiment result indicates that some test items, such as tooth profile error, circularpitch error and accumulated pitch error of gear are improved by one grade.
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