Qian Fa Deng

Kinematics Simulation of Eccentric Dual Rotated-Plates Lapping for Bearing Balls

Eccentric dual rotated-plates lapping is used for bearing balls finishing. The trajectory of ball in lapping is crucial for the ball’s geometric precision after finishing. The present work is to set up the model of eccentric dual rotated-plates lapping machine and simulate the ball processing in kinematics, and research the effect of carrier on the ball trajectory, through calculating the ball’s kinetic parameters of revolution speed, rotation speed and spin angle, and drawing the ball trajectory.

Experimental Study on the Ultra-Precision Polishing for the Quartz Substrates

The Quartz substrates are widely used in various fields, and the requirement for the surface quality of quartz substrate is higher than ever before. This paper focuses on the ultra-precision polishing technology for the quartz substrates, and the material removal mechanism in the process of ultra-precision polishing is discussed. The results showed that an extremely smooth surface of quartz substrate was obtained in the ultra-precision polishing process, and the best surface roughness reached Ra 0.82nm. Meanwhile, the thickness can be controlled very well.

Study on Polishing Technology of GaAs Wafer

GaAs are one of the most important semiconductor followed silicon, GaAs wafers are the mostly used substrates for fabricating integrated circuits (ICs). So the quality of ICs depends directly on the quality of GaAs wafers. A series of processes are required to manufacture high quality GaAs wafers. This paper reviews the literature on polishing technology of GaAs wafers, covering the history, summarizes the effects of slurry’s chemical and physical characters such as pH, oxidants, abrasive grit, velocity, and temperature in the polishing process. It also discusses some possible topics for future research.

Research on V-Groove Angle of Rotated Dual-Plates Lapping Machine

The V-groove angle of the machine is considered as one of important factors affecting the processing and the ball’s precision. To study its effect, the three-dimensional model of RDP lapping machine is built and a series of simulations at different V-groove angles are carried out, using the software ADAMS based on the RDP principle. The influence of three parameters including spin angle, spin angular velocity and revolution angular velocity are discussed by observing and analyzing the simulation results. It is concluded that some optimized V-groove angles can improve the sphericity of ball; some ones can induce the balls to move back and roll during some periods of the processing.

Simulation and Analysis for Spin Angle Track of the Ball Machined by Dual Rotation Plates Lapping Method

Spin angle is an important target of expressing ball rotation in the lapping process. Whether lapping track can uniformly cover the ball surface or not is directly determined by the variation of the angle. The simulation of spin angle track of the ball based on ADAMS (Automatic Dynamic Analysis of Mechanical Systems) with Dual Rotation Plates Lapping Method by applying virtual prototype technology and using ADAMS is given by the article. The track based on ADAMS is similar with the track of using mathematical theory on the whole. The simulation results show that DRP lapping method owns better lapping uniformity and it is easy to apply to science for the simplicity of structure and control. The spherical lapping uniformity will be further studied with ADAMS in a convenient way.

The Polishing Process of Cylindrical Rollers by Using a Double-Side Lapping Machine

The surface quality of cylindrical rollers has a great influence on the working life of rolling bearings. In the paper, double-side lapping machine and flannelette pads are applied to polish the cylindrical surface of rollers. After 20 min polishing, rollers with smooth surface are obtained and the roundness of the rollers have a improvement of about 0.3 μm, which means that the polishing process based on double-side lapping method can effectively improve the surface quality and geometric accuracy of cylindrical rollers.

Experimental Research on Double-Side Lapping of Cylindrical Roller by Taguchi Methods

The rolling element is the most important component of rolling bearings. Its geometric accuracy and consistency affect greatly the performance and working life of bearings. In this paper, a standard Taguchi L9(34) orthogonal array(oa) is designed to analyse how abrasive size, rotating speed of plates, deflection angle of carrier holes and other factors impacting on precision of cylindrical roller process and achieved the optimized parameters combination by adopting evaluation of Signal-to-Noise ratio and ANOVA analysis(analysis of variance). Under the optimized lapping condition, the roundness,pand s can reach , and respectively.

Analyze and Verify Cutting Depth Distribution of Different Grits Size SFAP

Semi-fixed abrasive plate (SFAP) lapping is an effective ultra-precision lapping method. It can efficiently obtain good surface quality in ductile regime machining. Probability density function of abrasive grains cutting depth is the key factor to control removing mode. This paper verified the function by analyzing and comparing simulation results and detection results. It showed the simulation results were consistent with the detection results. The more fine grits SFAP could result in the more consistent cutting depth on workpiece surface, and standard deviation of cutting depth distribution of 4000# SFAP was only 0.0754, compared with 1000# SFAP (0.1527).

Current Research Trends on Resin Bond Used for Abrasive Products

Resin bond is one of the most widely bond used for manufacturing abrasive product. This review paper discusses historical perspectives on resin bond, there are different abrasive products which can be produced by using various types of resin bond such as modification of Phonetic resin and a new water-soluble resin. It is intended to help readers to gain a more comprehensive view on resin bond used for abrasive products and to be instrumental for research and development in producing abrasive products.

Parameters Optimization on the Lapping Process with Porous Self-Generation Superabrasive Tool by Applying Taguchi Method

Porous self-generation superabrasive tool (PSST) is a newly developed metal bonded superabrasive tool. It is found that processing parameters have great influence on the machining quality when using PSST. This paper focuses on the application of Taguchi method for optimization of lapping process parameters when using PSST to obtain the best surface quality. An optimization experiment for lapping optical glass with PSST was designed by Taguchi method. Surface roughness Ra is considered as criteria for optimization. Influence of parameters involving filler concentration in binder, lapping load, lapping speed and concentration of solute are discussed, and the optimum lapping condition is figured out. The optimization result illustrates that the experiment design based on Taguchi method can successfully applied to determine the optimum processing conditions for lapping process using PSST.