Papers by Author: Chun Yan Zhang

Abstract: Grind-hardening machining is not only a complex process coupling mechanical, dynamical and thermal effects, but a process containing distinct changes of microstructure and properties of the workpiece grinded surface layer. Under the defined experimental conditions, an empirical formula was constituted to describe the relation between hardened layer depth and grinding parameter of grind-hardening layer, and the multi-parametric optimization was conducted. A commercial FEM software package was used to simulate the grind-hardening process. The distribution and variation characteristics of the temperature and microstructure in the grinded surface layer of workpiece were obtained and the forming mechanism of the grind-hardened layer is revealed.

Abstract: In order to prepare new functional macromolecule material, the coupling reaction of acenaphthene catalyzed by [Bmim]Cl/FeCl3 ionic liquid was investigated under mild reaction conditions and without any additional organic solvent. Pure 3,3’-biacenaphthene, which is used as intermediate of function aromatic polymer material, was obtained by recrystalling and column chromatography from the reaction mixture and was determined by GC/MS, 1HNMR and FTIR analysis. The influence of various reaction conditions on the coupling reaction of acenaphthene were studied by GC analysis and the optimum synthesis conditions of the reaction were obtain. Under optimun conditions, the yield of 3,3’-biacenaphthene will be 63.5 % and selectivity of that will be 85.6 %. Further more, [Bmim]Cl/FeCl3 is environmentally benign catalyst and solvent and can be reused.

Abstract: 1,2-aceanthrylenedione was synthesized through the acylation reaction of anthracene and oxalyl chloride catalyzed by anhydrous AlCl3. The effects of various reaction conditions on the yield and selectivity of 1, 2-aceanthrylenedione were studied by GC analysis. The results show that the optimum synthesis conditions of the acylation reaction are as follows : the molar ratio of oxalyl chloride to anthracene being 1:2, the molar ratio of anhydrous AlCl3 to anthracene being 4:1, the reaction time being 5 h, the reaction temperature being 303k and the solvent of the reaction system being CS2. Under those conditions, the yield and selectivity of 1, 2-aceanthrylenedione is 83.8 % and 92.3% respectively. Pure 1, 2-aceanthrylenedione was prepared by extraction and recrystallation. The structure of 1, 2-aceanthrylenedione was identified by measure of melting point, GC/MS, FTIR and 1HNMR analyses.

Abstract: Based on the metal cutting experiments, the forming model of feed direction burr is proposed in the paper, a physical parameter of determining the generating of typeⅠ feed direction burr — critical tool edge angle rI χ is given. And the main factors which influence rI χ are studied by the experiment, and related theory analysis is made. Furthermore, some new controlling methods and technology to restrain or decrease the feed direction burr in machining are developed.