Research On The Design Of Mutual Grinding Device And Experiment Of Mutual Grinding For High Precision Gear

High precision involute gear has high tooth accuracy and low tooth surface roughness.It plays an important role in precision equipment and instruments,precision radar,aerospace and robotics.With the progress of science and technology,the accuracy requirements of gear are gradually improved,and the higher the gear accuracy,the greater the manufacturing difficulty.At present,gear with grade 5 and above accuracy in the international standard ISO 1328-1:2013 is usually processed by gear grinding process.Grinding burns in grinding process.Maximum surface roughness Ra 0.2.Grinding is used for ultra-precision machining of parts.The accuracy and surface roughness of the parts after grinding can be greatly improved.To avoid grinding burn and further reduce tooth surface roughness.It is of research significance to complete high-precision gear machining.This paper mainly studies the application of lapping method in the machining of high-precision involute gears,and proposes the gear lapping method.Based on the principle of error equalization,the two gears are lapping each other.Reducing tooth surface roughness,and the gear tooth accuracy is improved at the same time.Combined with the mutual grinding,a high-precision gear mutual grinding device is developed,and the motion model of the device is proposed.The material removal mechanism a in the lapping process is analyzed.Aiming at the problem of inconsistent relative sliding velocity of gear tooth meshing along the involute direction in the gear lapping process,a wave generator-link swing mechanism is designed,and two motion schemes of gear lapping along the radial vibration are proposed.Dynamic force and vibration assisted grinding with tooth surface deviation in meshing.Analysis of the influence of the motion scheme on grinding efficiency and accuracy.Design of a compound friction drive mechanism to drive two pairs of research gears at the same time,Asynchronous rotation deviation of two friction wheels caused by radial runout is less than 0.1%after precision grinding.The backing plate is an important gear positioning part on the lapping device.The spiral accuracy after gear mutual grinding is affected.The experiment is carried out by using high precision gear mutual grinding device.The results show that there are obvious grinding marks on the tooth surface before the experiment.After the mutual grinding,the tooth surface texture is refined,Average roughness along tooth width and involute decreases by 52.3%and60.9%.Modification of involute profile of gear.Average reduction of tooth profile deviation of#4008B gear by 5.1%.The accuracy of the helix reaches F_β=3.04μm,F_β=3.21μm respectively,and average accuracy improvement 17.35%;The cumulative total deviation of gear tooth pitch is reduced by 21.9%on average,and the deviation of single tooth pitch is reduced by 10.7%on average.The method and device of mutual grinding proposed in this paper can be used for high-precision gear machining,which solves the problem of inconsistent relative sliding velocity between teeth in the process of gear mutual grinding,and can refine the tooth surface texture,reduce surface roughness,improve the accuracy of gear teeth at the same time.The gear mutual grinding device can process two gears at the same time.The grinding method provides a new idea for manufacturing precision gear.