| Gears are key mechanical components with large quantity and a wide range of applications,especially the involute gears,which are used in almost all fields of the national economy.In order to make China be a strong country in manufacturing in industry,it is necessary to comprehensively improve the manufacturing level of mechanical basic parts like gears.Measurement goes first for precision manufacture.The involute gear artifact,which is used to transmit the involute value of gears,is the key factor to evaluate the level of gear manufacturing.At present,China has mastered the processing and testing technology of the class-1 precision(highest class)gear artifact in the international standard ISO 1328-1:2013(E).However,research on the reference gear involute artifact is relatively backward.In order to solve the processing technical problem of the class-1 precision gear involute artifact,the dissertation established the mapping relationship between the installation eccentricity of the base disk and the rail crown of the guide on the tooth profile deviation of the gear involute artifact,and optimized the eccentric phase difference and effective spread angle of the phase range between the two base disks.It was concluded that the two base disks have the least influence on the profile deviation of the gear involute artifact when the eccentric phase difference of the two base disks is 180°,and the exhibition angle is between 160° and 200°.For the refinement of high-precision planes,a precision grinding device for planar local high point removal is proposed,which is used for refining the guide rail,the end face of the bushing and the base disk.Then,for the refinement of the inner hole of the base disk,a precision inner-hole grinding device of the liquid-expanding is proposed for refining the reference disk inner bore of the base disk and the reference inner bore of the gear involute artifact.Then,for the refinement of the outer cylindrical surface of the base disk,a precision machining device for the outer cylindrical surface of the disk part and its taper error adjustment method are proposed,which could be used for the refinement of the outer cylindrical surface of the base disk.Finally,the dissertation completed the structural optimization of the high-precision processing device of the gear involute artifact,the refinement of the guide rail,the refinement of the base disk,the refinement of the mandrel and the refinement of the bushing,and built a set of grinding device for gear involute artifacts with class-1 accuracy.After the refining,the straightness error of the guide rail is less than 0.15 ?m,the eccentricity of the base disk one is 0.13 ?m,and the eccentricity of the base disk 2 is 1.38 ?m.The base disk 1,the base disk 2 and the gear involute are all mounted on the mandrel,and the positional eccentricity of the them were 0.32 ?m,0.10 ?m,and 0.26 ?m respectively,and the flatness error of the end face of the sleeve is 0.1 ?m.A grinding experiment is carried out by using a refined involute artifact grinding device on the gear involute artifact specimen with the ase circle radius 100 mm.The test results showed that within the evaluation interval of 70 mm in length,the total profile deviation of the gear involute artifact specimen is 0.51 ?m,the profile form deviation is 0.45 ?m and the profile slope deviation of of the gear involute artifact specimen is 0.19 ?m of the gear involute artifact specimen,which all meet the processing requirements of the highest class(class 1)gear involute artifact in GB/T 6467-2010.The successful development of the class-1 processing device of gear involute artifact have important scientific significance and research value for establishing the system of the traceability and value transfer benchmark for gear involute in China. |
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