Applied Mechanics and Materials Vols. 121-126

Abstract: The recycling of grinding swarf which is a typical industrial waste discharged from machining facilities for ball and/or roller bearings is studied. The grinding swarf is investigated whether it is possible to use as a raw material for commercial products such as a disposable body warmer. Since the major constituent of the disposable body warmer is fine iron powder, there is strong possibility that the grinding swarf can be used to make the disposable body warmer instead of the commercially available iron powder. The influence of the pretreatment conditions to the grinding swarf on various heat-generating characteristics of the disposable body warmer sample; such as average temperature and heating duration, is examined. It is shown that the heating behavior of the disposable body warmer made from the grinding swarf was comparable to that of commercial one.

Abstract: Balance development of urban and rural industries has become important foundation and momentum of forming a new pattern that integrates economic and social development in urban and rural areas, and the main way to optimize the urban and rural industrial structure in our country. Reasonable division and distribution of urban-rural industrial play an important part in promoting coordinated development of urban and rural industries. By setting indexes and using cluster analysis method, the factor intensity of thirty-eight industries was divided. According to the aggregation of urban space and dispersivity of rural space, this paper confirm that the knowledge intensive industries and capital intensive industries should be distributed in urban areas preferentially , and the labor intensive industries and land intensive industries should be distributed in rural areas preferentially.

Abstract: A new holding-lifting autosteer mechanism (HAM) is introduced which is fit for aircraft taxi-mover. The relation between the Multi-bar mechanism and tug operation of the aircraft on the taxiway is also discussed. With this understanding , a virtual parameterized model of holding-lifting autosteer mechanism is established by Pro/E . Based on Single-opened-chain , inverse dynamic analysis for planar parallel lifting unit is presented .

Abstract: In recent years, the style of 3C products demanded thin and small results due to gradual trends, though most of the industry is forming a continuous manner of stamping. However, the material thickness cannot be changed in products. This paper employs the rigid-plastic finite element (FE) DEFORMTM 3D software to investigate the plastic deformation behavior of titanium alloy (Ti-6Al-4V) workpiece for the forming processes of cellphone covers. In addition, this study utilizes the Solid Work 2010 3D graphics-rendering software for modeling, which is simulation software used to import various forming process conditions. The software analyzes the effective strain, the effective stress, critical damage value, and the die radius load distribution of the work-piece. Furthermore, this study used simulative software to analyze its forming processes for changes in grain size of the microstructure. The analytical results confirm the suitability of the current finite element software for forming processes of cellphone covers.

Abstract: Dynamics performance of the bearing and the reliability are largely depended on its clearance. The clearance of the bearing is determined by the assembly process, the initial setting clearance, the rotating speed, the thermo-expansion, etc. In this paper, the clearance of automotive hub bearing is modeled by analytical method. Then an illustrative example is given for demonstrating the effectiveness of the model. The fundamental study is the basic of dynamics performance of the bearing. Also, it can be used for analyzing the performance of bearing assemblies as well as optimization of the process.

Abstract: The mechanical properties of the nodular cast iron treated by troostite heat treatment were investigated, which technologies are control-cooling, adjustment at medium temperature and isothermal transformation. The fracture morphology and the microstructure were observed by scanning electronic microscope. The experimental results show that, the microstructure and mechanical properties in surface of the pieces were nearly same as that in the core after processing. Remarkable sudden change spot was not observed. The microstructure and performance with good uniformity and continuity have high stability.

Abstract: By reasonable assumption and considering the friction, contact, preload intensity, load eccentricity, bolt bending, and other nonlinear factors, we establish three-dimensional finite element model for the high duty bolted joint to reflect the bolt behavior and develop the finite element calculation method for static strength, fatigue strength and related stresses of bolt. By this method, we do numerous numerical simulation experiments to study the effects of preload intensity, support plate thickness on the bolt behavior. These results will guide designer to complete the slewing bearing design effectively and accurately, and these research ideas can be well applied to bolted joints study in other devices.

Abstract: This article analyses the lacking of bilingual teaching of Advanced Manufacturing Technology, and proposes solutions to these lacking.

Abstract: Typical challenges that manufacturing enterprises are facing now are compounded by lack of timely, accurate, and consistent information of manufacturing resources of shop floor. This paper presents a real-time Manufacturing Resources Tracking and Tracing Framework (MRTTF) based on Auto-ID devices such as RFID. Then, a configuration solution of equipping traditional manufacturing resources with Auto-ID devices is described. And the real-time information tracking flow of attached manufacturing resources (Men, Machines and Materials) is also illustrated. The presented framework and solution will provide real-time information of manufacturing resources for production mangers or supervisors to make accurate and optimal decisions.

Abstract: The rule set which is acquired based on rough set theory can be classified into two categories: deterministic rules and probabilistic rules. Traditional attribute reduction definitions in variable precision rough set model cannot guarantee the rule properties, namely deterministic or probabilistic. In this paper, a new criterion for attribute reduction is put forward based on variable precision rough set model. The rule properties can be preserved during the process of attribute reduction. The relationships between the new reduct definition and available definitions, including Ziarko’s reduct definition and β lower distribution reduct definition are also discussed.