Advanced Materials Research Vol. 426

Abstract: There are a large number of factors influencing the performance of hydraulic oils, and many of them can not be quantified. Currently, the evaluation indices of hydraulic oils are contamination, physical and chemical performance. In this paper, a new fuzzy comprehensive evaluation method is put forward, by which the oil can be synthetically evaluated from the aspects of physical and chemical indices, simulant indices and performance test indices.

Abstract: Grey Classification is a method which can judge and analyse the matters in the Grey System. It is more reasonable and practical than other Optimal Design. By study of Grey Classification and the traditional method of multi-objective optimal design of helical gear transmission, we found out the most satisfied results.

Abstract: Unexpected work-piece deformation during the course of milling will lead to part bending or distorting, which is critical to get its quality performance lower. In this paper, a novel process based deformation control method is proposed using High Definition Metrology (HDM). Main factors that affect machining deformation of work-piece are analyzed firstly. Then process based deformation control model is made, which divides one machining process into four stages. The surface flatness data of work-piece at each stage are obtained respectively. Finally, the practicality and effectiveness of this new approach is verified using the case of Aluminum alloy 6061 part milling.

Abstract: Bionic design is a new method in engineering design. The mouthparts especially for the chewing ones of the insects are discussed in this article. To improve the tool life and cutting properties are always the critical for the cutting tool design aim. The foreground of cutting tool design is discussed using the mouthpart of insect as bionic design object. The basic structure of the chewing mouthpart, type of mandibles, geometry, hardness, and element contained, moving mechanism and so on will be described. The research can also make direction at new tool material and tool geometry parameter design.

Abstract: In wireless sensor networks, congestion causes overall channel quality to degrade and loss rates to raise, leads to buffer drops and increased delays, and tends to be grossly unfair toward nodes whose data has to traverse a larger number of radio hops. Hybrid congestion control mechanisms relieve the congestion by creating the new path; when establishment of a new path is failed, fairness aggregate mechanisms limits forward rate, ensures that each source node sends data fairly. Based on energy-saving, algorithms for mild congestion have been improved.

Abstract: This paper presents the 3D molding simulation of the ellipsoid drill point based on the mathematical model, and the influence factors of the drill point’s key structure angles were searched. The quantificational relations between the key structure angles of the ellipsoid point and its molding configuration parameters were presented. Variation trend of the drill point’s structure parameters affected by it’s molding parameters are given for design and optimize the ellipsoid drill point.

Abstract: In this paper, TC4 (Ti6Al4V) alloy has been cut at high speed minutely .Chip roots is extracted by rapid knife device. The optical microscopic image of the root chip is analyzed. The reasons why it is difficult to cut for TC4 alloy are firstly due to the low ability for heat transfer, while the second one maybe the cutting path is mainly the trans-granular failure which will consume more energy due to the coarse grains of TC4 alloy.

Abstract: Taking the interface crack in the cermet cladding part as the study object, a new comparative propagation property parameter (CPPP) CP suitable to judge the interface crack propagation direction in the cladding part is proposed. The interface crack propagation criterion is established. Based on it, the theoretical research on the parameters (CP1, CP2 and CPi) for the crack parallel to and lying on the interface propagating to the clad, to the substrate, and along the interface is carried out. The interface crack propagation law is investigated with an example. The research results show that the crack will more easily deflect to the clad.

Abstract: Thermal error modeling. Neural network. Gear hobbing machine. Error compensation. Abstract. Four key thermal sources of YK3610 hobbing machine were selected in this paper, and a thermal error model based on the four temperature variables was proposed by using back propagation neural network. A thermal error compensation system was developed based on the proposed model, and which has been applied to the YK3610 hobbing machine in daily production. The result shows that the prediction accuracy of thermal deformation in the YK3610 hobbing machine has been improved.

Abstract: The research method of the inner friction and wear characteristics of plain bearing which is mainly conducted currently, is to analyze the all factors that affect the friction and wear of plain bearing from the perspective of wear, and to build friction and wear model, and then to conduct the research on the model. The article establishes the friction and wear dynamics model on base of the tribological systems approach, and on the base of analyzing the internal friction system and inner process of Tribology system of plain bearing. The article conducts the research on the friction and wear characteristics of plain bearings, and studies the relationship between the inner temperature rise and the heat on the base of simulation of the dynamics model. The consistency of the simulation results and academic calculation of the dynamic model proves that the dynamic model, which is established in the article, is correct.