Applied Mechanics and Materials Vols. 26-28

Abstract: Nano-calcium titanate-based coated silica gel G (GCTO) was prepared by the citric acid sol–gel method and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and Fourier transform infrared spectrophotometry (FTIR). Its lead, cadmium and nickel ions adsorption properties from water were studied. Adsorption and elution were investigated under different conditions. The results showed that the nanometer calcium titanate was immobilized on the silica gel G firmly, becoming a new composite adsorbent. The lead, cadmium and nickel ions were quantitatively retained at pH 5-9; their adsorption capacities of GCTO were 114 mg•g－1, 11.2 mg•g－1 and 20.1 mg•g－1, respectively. The adsorbent can be regenerated completely by elution with 1 mol•L－1 HNO3. The adsorbent has a promising prospect in removal or enriching and separation of heavy metals in water.

Abstract: Information modeling design is the key of product development. An information modeling is discussed in this paper. It determines product function, form and basic structure. Major cost is spent in early product development. The model presented in this paper includes activity model for the process design. The activity model sets the context in which the objects are defined and used. The main purpose of the model development is to initiate standard interface specifications that are necessary for design and process development. The design information that is necessary for conceptual process planning has been collected and modeled using UML.

Abstract: The Ni-P-nanodiamond electroless composite plating adopting nanodiamond made dispersed acid liquid and the technology for Nanodiamond Electroless composite plating on steel plate was studied. The effect of plating factors on the properties of the coating was studied with orthogonal tests. The optimum formula of nanodiamond electroless composite plating was as follow: nanodiamond 3.0g/L, temperature 85°C，pH 4.5.Microstructure, corrosion resistance and wear resistance of coating were studied. The result show that The nanodiamond content of the composite coating can get weight 15.44%, and the cystiform microstructure is fine and the cohension between coating and base is good. The coefficient of friction of coating is about 0.8 time compared with that of pure Ni-P coating and its corrosion resistance was improved greatly due to the fine nanodiamond particle occupying in the little pit.

Abstract: A bran-new lattice based cross-domain model is proposed to solve the shortcomings of the existing authentication model. Firstly, using the lattice theory, this model builds credit-domain alliance and user alliance on the two dimensional coordinates to avoid the abuse of centralized plans. Secondly, it uses the superiority thought of the existing authentication system to strengthen the integrity of the model. Finally, the detailed work flow, formula, domain disposal, extended algorithm, and identity-based Stealth transport protocols of the new model are drafted. It ensures the user’s identity information and privacy. After the certification and analysis, this model proved to have a good Practical character and an extremely large extension space.

Abstract: Work-piece elastic deformation caused by clamping force from fixture will lead to part bending or distorting, which is critical to lower its quality performance. In this paper, a novel zonal compensation method is proposed to compensate the work-piece elastic deformation through fixture layout optimization based on High Definition Metrology (HDM). The zonal surface flatness data of work-piece in fixture is obtained with densely optical measurement firstly. Then, they are reorganized according to the accuracy requirement based on the zonal distribution. Finally, the surface flatness compensation model based on fixture layout is made. The practicality and effectiveness of this new approach was verified using the case of Aluminum alloy 6061 part milling.

Abstract: The rapid development of digital enterprises changes the whole traditional structure of production and business patterns. But by now, there is no generally accepted theoretical model that can be applied in both traditional manufacturers and modern companies. In this paper, we construct a three-layer customer-oriented architecture of the digital enterprises, and elaborate the mechanism it works. For the pattern of digital enterprise will be applied in wide range of areas in the future, we put forwards three problems that must be concerned for the development of digital enterprises.

Abstract: Through analyzing the process of brake, a dynamic model of automobile and a model of the relationship between braking distance and adhesion coefficient were formed; also a simulation calculating model of braking distance was established with the use of Matlab. Finally, a research was done toward the braking distance of a type of a car running on a road after using snow-melting agent. On one hand, with the application of the simulation model which has been established, calculations have been done to the braking distance of Bora vehicles running on roads after using deicing salt; on the other hand, by experiments, Bora vehicles’ braking distance and maximum braking deceleration under the same road condition were measured, meanwhile, the established simulation model was verified.

Abstract: Combining with production features of the machining shop in small and medium manufacturing enterprises and difficulties in their information construction, we studied deeply on the scheduling model suitable for complex information environment of the machining shop, and established the job planning and scheduling system model. The hybrid modeling method of UML and IDEF was adopted to describe the architecture of the job planning and scheduling system in machining shop. IDEF, which has good flexibility and logic, is used to describe the system's functions and needs, and then express an implementation scheme that can meet the needs and realize the functions. At the same time, UML is utilized to reflect the chronological relationship of the interaction between functional objects. From the perspectives of structure, function, information and control, both of the above advantages are combined to establish the flexible and reusable model for job planning and scheduling system in machining shop.

Abstract: The chip morphology and the formation and development of the adiabatic shear band within the serrated chips formed in high speed cutting of 30CrNi3MoV steel with two tempering hardness were observed and analyzed using optical microscope and SEM. The investigation shows that as the adiabatic shear phenomenon occurs and develops, the chip morphology changes as follows: ribbon chip→serrated chip with deformed band→serrated chip with transformed band→fractured chip. The cutting speed and tempering hardness is the two main factors affecting adiabatic shear, in the case of lower cutting speed the formation and development of adiabatic shear band are more sensitive to tempered hardness increase. The deformed shear bands are constituted by large deformed microstructure, while the formation of the transformed shear bands has experienced the large plastic deformation and grain refinement.

Abstract: It makes a brief description of the walking robot used in the forestry. The paper makes a deep analysis and founds a scheme on the walking mechanism of forestry walking robot, illustrates the relationship among the mechanism structure, component size, tracks and kinematic parameters of the foot. It makes an experimental prototype design which through the analysis before, embeds the scheme into the design parameters, and conducts an actual verification about the results of theoretical derivation. The results proved the feasibility of the design, and reflected the impact factors of the motion. It will lay the theoretical foundation for the walking mechanism’s design and research of the forestry walking robot, and will be in favor of the development and utilization of the forestry walking robot in the new period.