Advanced Materials Research Vol. 909

Abstract: Direct tensile testing machines are the necessary to study tensile property of rocks. However, a traditional testing machine has the weakness of absenting effective subjacent brace. So, the whole tensile experiment can not be done completely. By using elastic brace, the whole tensile experiment really can be finished, then we can get the stress-strain curve. But, the samples are destroyed around incorrect planes. Aiming at the disadvantage of the machines, the author brings forward a new method of improving the direct tensile testing machine by using two magnets as the subjacent brace with magnetic levitation function. In this article, the author analyses the reasons why magnetic levitation can offer support and explains the components of the brace, its installation and principles. At last, the authors analyze the design idea and the technical effect of the brace.

Abstract: Based on low-carbon and product life-cycle design concept, this paper classifies risk factors in different stages of automotive product life cycle design risk evaluation indicator system and analyzes the different risk categories weight adopting the rough set and analytical hierarchy process to determine the key risks of automotive product in different stages of life cycle. Additionally, real instances are cited to verify the conclusions.

Abstract: With the advent of recycling economy era, the automobile remanufacturing industry has aroused wide concern of the society. This paper first proposes a risk map in automobile remanufacturing, including technology risks, market risks, management risks, cost risks, parts supply risks and life cycle synchronization risks. Then, it designs an assessment indicator system of risks in automobile remanufacturing and uses AHP approach to establish a model to assess risks in automobile remanufacturing. Finally, the paper calculation example and proves its correctness and practicality in the empirical analysis section.

Abstract: Control valve is the central part of operator mechanism. The property of high voltage circuit breaker mostly depends on the opening time of the control valve. This paper proposes a new way of connecting the magnetic valve and hydraulic control valve in series to realize valve multiple reversing. A mathematical model has been made to analysis the proposal. The results demonstrate that the close time of the control valve is less than 35ms, and the opening time is less than 30ms. The property meets the operating requirement.

Abstract: This paper takes the tooth-slot zone with winding of stator and the stator yoke as two integrated circular cylindrical shells. Circumferential mode frequencies of the stator system are calculated. Compared with the result of FEM simulation and experimental mode analysis, the result of analytic formula is evaluated.

Abstract: Material is deformed upon the application of an external force. If the external force is removed, the material either returns to the original shape, or it is transformed forever. The ability of a material transform without destroying it is called plasticity, and the permanent transformation is called plastic deformation. Using the plastic properties, of a material in processing is called plastic process. Press processing is a kind of the plastic processing method. In today's automotive industry and electronics industry, press processing is an indispensable processing method to produce frames or panels. In this study, the best initial shape before forming of blank metal material is determined for bending processes to produce a refrigerator door panel.

Abstract: At present, the domestic most use the traditional machining methods of production, such as general milling, drill, ground, etc. But the traditional processing method is low material utilization ratio, time-consuming power consumption, and low production efficiency. as the same time the product quality is difficult to meet the requirement of high strength. In contrast, shifting fork forming die forging can improve labor productivity, and can obtain the ideal parts surface roughness and size accuracy. And with the forming of die forging the variable speed fork general rarely cutting processing, just in require special high points will has fine grinding. This design has completed the variable speed fork of die forging shape of mold design giving the design plan and design process. This topic is about the design of the numerical simulation, getting the expected of the press one.

Abstract: Due to the deflection of tool and workpiece induced by cutting force, there is a high complexity associated with the prediction of surface form errors in the peripheral milling process of thin-walled workpieces. And the prediction of surface form errors induced by cutting deflection is the precondition for process optimization and error compensation. This paper proposes a systematic simulation procedure suitable for surface form errors prediction in peripheral milling of low rigid thin-walled workpiece. Some key algorithms with the judgment of contacts between the cutter and the workpiece, the flexible iterative algorithm as well as the tool/workpieces deflection prediction using FE model are developed and presented in detail. Comparisons of the form errors and cutting forces obtained numerically and experimentally confirm the validity of the proposed algorithms and simulation procedure.

Abstract: The process of assembling is one of the most important steps of technological process of production, consisting in a logical succession of operations with the goal of grouping pieces in subassemblies, assemblies in aggregates and aggregates in product. This paper, presents a new method of analysis, planning and consequently obtaining a reliable tool for supervising technological process of assembling for an expandable slide valve.

Abstract: One of the causes of malfunction of commercial vehicle is corrosion or wear. In order to prevent corrosion and wear, lubricants have to be supplied periodically. However, the period of lubrication usually depends on operator's judgment. If the period is too short, excess lubricant will cause pollution and unnecessary expenses, whereas long periodic supply of lubricant might cause wear, damage and eventual breakdown. Therefore, an automatic lubrication system with predetermined interval will reduce the excessive supply of lubricating oil and prevent wear and damage. This thesis presents an automatic lubrication system which consists of a lubricant pump and an embedded controller. An automatic lubrication operating algorithm is used to operate the lubricant pump and feedback the pressure status of the system using pressure sensors. The developed system shows an efficient periodic supply of lubricant.