Bing Hai Lv

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.

Application and Prospect of the Non-Newtonian Fluid in Industrial Field

Non-Newtonian fluid is a kind of fluid that its shear stress is not always keeps a linear relationship with the shear strain rate. An overview of its applications was made here. Based on the special rheological properties, non-Newtonian fluids are divided into different types and used as additives, mediums and protective materials in many fields. The paper focuses on its applications in fluid rheological properties improving, damping devices, individual protection equipments and mechanical processing. The main achievements in application of the non-Newtonian fluid were introduced and a further prospect was also summarized.

Ultraprecision Lapping for the Zirconia Ceramic Plane

Zirconia ceramic widely applied in the fields of electronics, instrumentations and mechanical manufacture for its good physical and chemical properties. The ultraprecision lapping technology for the Zirconia ceramic is studied in this paper, and the influence of the different lapping parameters such as slurry, load and lapping velocity on the surface roughness of Zirconia ceramic is discussed. The evolution of surface construction is observed with the microscope to analysis the material removal mechanism. An extremely smooth surface with roughness 6.55nm Ra is obtained in the ultraprecision process. It is also found that the gap in the material will limit improvement of surface roughness and a better surface roughness of 4.72nm Ra was observed when using more compactly material lapped by same method.

Study on Dual-Plane Ball Polishing Method for Finishing Ceramics Ball

This paper represents a dual-plane polishing method for ceramics ball. Compared with traditional ball polishing method, its upper and lower plate are all flat and easy to use soft pad to polish, so it can largely reduce the surface mechanical damage and obtain high quality processing surface. This paper analyzes surface polishing trajectory by calculation and simulation to test the polishing trajectory uniformity. A mathematics model of polishing process is established to disintegrate the process of a balls movement. Experiment is operated in dual-plane planetary polishing machine. The result shows that perfect polishing surface and spherical error can be obtained under the proper process parameters, the surface roughness achieves 4nm and the spherical error can reach 0.217μm.

Research on Wear Mechanism of Self-Sharpening Fine Super-Hard Abrasive Tool

To achieve the components of the highest quality in terms of shape, dimension, surface integrity and high efficiency in the course of processing difficult-to-cut material, the concept of self-sharpening fine super-hard abrasive tool as machining tool is put forward, this method not only improves the dressing performance of the abrasive tool, but also ensures the accuracy and durability of the abrasive tool, self-sharpening fine super-hard abrasive tool lapping technology is developed by using Zn as abrasive fillers and using FeCl3 solution as lapping liquid, the wear form of the self-sharpening fine super-hard abrasive tool and the influence of abrasive wear on the material removal form is studied, research shows that the wear of the self-sharpening fine super-hard abrasive tool is mainly in breakage wear, which has a good self-sharpening performance, and the material removal form is mainly in two-body material removal mode., which means this method has good holding force of abrasives.

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.

Analysis on Wear of Self-Sharpening Fine Super-Hard Abrasive Tool

In order to improve the efficiency of ultra-precision processing, the self-sharpening fine super-hard abrasive tool is presented to reduce or eliminate the surface and subsurface defects and improve the process efficiency. In the study of efficient experimental research of self-sharpening fine super-hard abrasive tool, base on single factor experiments such as additives composition, grinding speed, grinding pressure and processing liquid. The results showed that the wear rate of the self-sharpening fine super-hard abrasive tool can reach appropriate rate when the additive concentration 30wt%, grinding pressure 45N, grinding speed 60rpm and processing liquid 1wt%.

Influence of Soluble Filler on the Mechanical Properties of Porous Self-Generation Superabrasive Tool

The soluble filler in the newly developed metal bonded superabrasive tool named porous self-generation superabrasive tool (PSST) plays the most important role. To investigate the influence of filler material and its content on the mechanical properties, Zn, CaO, SiO2 are employed as the soluble filler.Shear experiments and lapping experiments are carried out. It is found that the shear force of PSST with Zn is the highest, and declines little from 3.2 kN to 2.9kN with increase of filler content from 10wt% to 30wt%. On the contrary, the shear force of PSSTs with CaO and SiO2 decline obviously from 2.1kN to 1.2kN, and 1.7kN to 0.6kN respectively. The wear rate of PSST depends on not only its own mechanical strength but also the dissolution rate of the filler. It comes out that the wear rate of PSST with Zn is similar to that of PSST with SiO2, ranges from 0.04mm/h to 0.13mm/h. The wear rate of PSST with CaO is much lower, ranges from 0.02 mm/h to 0.08 mm/h.

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.