Fluid Dynamic and Mechanical & Electrical Control Engineering

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Authors: Xue Feng Li, Hong Bin Liu
Abstract: In this paper, circulating box cover is taken as the main object of the study with the application of Taguchi design of experiment and Moldflow software. The warpage deformation was obtained under different molding conditions including melt temperature, mold temperature, filling time and packing time. The influencing degree and trend of these parameters was studied by using the rang analysis, and the optimization set of factors was obtained. Experimental results show that the optimization design is effective and the warpage of the product reduce.
335
Authors: Ming Ping Zou, Wu Jiao Xu, Peng Cheng Wang
Abstract: To investigate the hot deformation behaviors of AISI 4120 steel, isothermal compression tests were conducted using Gleeble-1500 thermal-mechanical simulator in the temperature range of 1073-1373K with the strain rate of 0.01-10s-1. The hyperbolic sine law in Arrhenius type is used in the constitutive modeling for AISI 4120. The influence of strain is incorporated in constitutive analysis by considering the effect of strain on material constants α, n, Q and ln A. The flow stress values predicted by the developed constitutive equations show a good agreement with experimental results, which reveals that the developed constitutive equations could give an accurate and precise prediction for the high temperature flow behaviors of AISI 4120 steel. The predictability of developed constitutive equation was further quantified in terms of correlation coefficient (R) and average absolute relative error (AARE). The R and AARE were found to be 0.9847 and 8.0372% respectively, which reflects the good prediction capabilities of the developed constitutive equation.
339
Authors: Wen Hui Cao, Hong Bin Liu, Shen Song Wang, Ting Yang
Abstract: The optimization of the parameters in high-speed milling was analyzed based on the principal component analysis and the Taguchi method. The cutting speed, feed per tooth and cutting depth were selected as the cutting parameters while the cutting force, cutting power and surface roughness parameters were selected as quality characteristics. The optimum cutting parameters were obtained and the comprehensive quality of high - speed hard machining has been guaranteed.
343
Authors: Xue Jun Wang, Yi Lin Chi, Fu Yu Li, Li Gao, Yong Xin Peng
Abstract: Industrial robots are widely applied in all kinds of automatic production line. It is the most important members in the family of robots. To improve the product quality and the precision of the robots, in addition to control strictly the production techniques and monitor its manufacturing process, the most important is to improve the design level and the design efficiency. In this paper, a new type of automatic four degrees of freedom industrial robots will be studied by using Solid Edge ST4 3 d synchronous modeling technology. In the process of design, synchronous modeling, parallel design, cooperative modeling technique and Top-down Assembly Modeling technology are combined with during the design. The whole product modeling design has included module and subsystem, has accomplished chassis module, and turn arm module and grab module design. The key point in this paper is that synchronous modeling technology is used in the three dimensional modeling the design application, and shows that the technology in different modules and the union between different designers. The results show that all the technical application above can improve the design efficiency, reduce design error and design iterative process, thus greatly improve the product quality and production efficiency
347
Authors: Xue Jun Wang, Yi Lin Chi, Li Gao
Abstract: Corner conveyor is widely applied in all kinds of automatic transmission line, and it is the most important members in the family of conveyors. To improve the product quality and the precision of the corner conveyors, in addition to control strictly the production techniques and monitor its manufacturing process, the most important is to improve the design level and the design efficiency. In this paper, a new type of the side of the V belt drive friction with friction type of new structure will be studied by using Solid Edge ST4 3 d synchronous modeling technology. In the process of design, synchronous modeling, parallel design, modular design technology and top-down assembly modeling technology are combined with in the design of corner conveyor. With modular ideas for design of thought to consider the overall structure of design scheme, design will turn into different parts of conveying design module to consider, and promote the standardization of product design. The key point in this paper is that synchronous modeling technology is used in the three dimensional modeling of corner conveyor, and shows that the technology in different modules and the cooperation between different designers. The results show that the application of the technology can reduce iterative design process and design error, thus the design efficiency of engineer is greatly improved.
351
Authors: Jin Hu, Gen Bao Zhang
Abstract: Static rigidity of workpeice spindle component is a very important index of the rigidity of derict-drive gear hobbing spindle unit. In this study, the static rigidity of workpiece spindle system were analyzed through a finite element method (EFM) by building geometric models and studying the deformation when radial cutting force was imposed. Experiments on workpiece were carried out with and without the assistance of tailstock center separately to measure the changes of the static rigidity of spindle. The results prove a less change of the static rigidity of spindle when with the assistance of tailstock center, which helps to ensure the accuracy and surface roughness of a workpiece.
355
Authors: Xue Jun Wang, Yi Lin Chi, Fu Yu Li, Li Gao, Ping Xu
Abstract: To improve the quality and precision of the conveying equipment, in addition to strictly control the production craft, more important is to improve the design quality and the design efficiency. In this study, Solid Edge ST4 3 d modeling technology will be proposed to be used in synchronous roller conveyor design. A double chain transmission roller conveyor will be designed. In the process of design, synchronous modeling, parallel design, cooperative modeling technique and Top-down Assembly Modeling technology are combined with during the design. Modular design train of thought is used to consider the overall structure of design scheme. Design of roller conveyor will be divided into different design module to consider, the aim is to promote the standardization of product design. The key point in this paper is focused on the parametric design, top-down assembly modeling technology, synchronous modeling technology [1] in roller conveyor design. Meanwhile exploring roller conveyor and other general transportation equipment design process of standardization implementation is another main work. The results show that the application of the technology can reduce design error and design iterative process, thus greatly improve the design efficiency and engineer the design of the product quality.
361
Authors: Zhen Yu Han, Po Hu, De Dong Han, Hong Ya Fu
Abstract: This paper outlines a conceptual framework of STEP-NC manufacturing system, which integrates the entire manufacturing process including CAD, CAPP, CAM and CNC, to make full use of the advantages of the new generation of data model. The STEP-NC manufacturing system consists of five parts and the STEP-NC standard is used to transport the complete product information. The intelligent CNC in this system can parse STEP-NC program directly so that no translation is needed and the part programs are reusable. Networked manufacturing can be realized by implementing this new framework of STEP-NC manufacturing system.
365
Authors: Zhen Zhen Lei, Hong Tae Kang, Jiu Hua Wang, Lian Cheng Ren, Yong Gang Liu
Abstract: This project is focused on the finite element (FE) analysis for mechanical characteristics of resistance spot welding (RSW) process with three sheets stack up instead of conventional two sheets assemblies because of its wide application in automobile industry. It is proved that the protuberances region localized in the nugget area induced in the welding process are more inclined to have fatigue failure such as cracks and fracture. Local stress and strain distributions for three sheets stack up under quasi-static tension load are investigated by both experiments and FE analysis with commercial software code ANSYS and NASTRAN. The high stress/strain value is concentrated at the edges of nugget instead of nugget center from cross section view and stress/strain distribution at the center region of the weld nugget is relatively low. The FE analysis has effectively verification with the experiments results.
369
Authors: Zong Xiang Yao, De Ping Jiang, Chao Pan, Xiao Ming Wang
Abstract: The research status of welding process between magnesium with steel have been surveyed.This article detailed the laser welding, Laser-TIG hybrid welding, pressure welding,diffusion brazing. The paper pointed out that it is a prominent problem of magnesium to be oxidated easily and existing intermetallic compound in the joint, which will produce adverse effect to property of welded joint. So how to control morphology and existence state of intermetallic compound (IMC) is the key for quality connectors in joining of magnesium with steel.
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