Advanced Materials Research Vol. 421

Abstract: Cutting part is a key part of machine for cutting mulberry branch. The cutting part structure could influence quality and efficiency of machine for cutting mulberry branch, directly. To obtain a suitable cutting part structure, research of cutting part of machine for cutting mulberry branch is implemented in this paper. Firstly, the stress situation of mulberry branch is analyzed through different cutter blade shape. A kind of cutter blade shape is got from the analysis result. Then this kind of cutter is used to build a cutting model. The cutting model is used to make dynamics simulation for the cutting process and analyze the cutting process through the ANSYS/LS-DYNA software. The curve figures got from the simulation result also provide certain reference for the design of cutting part.

Abstract: To lay the foundation of the automation for line heating forming, a method for heating path generation and simulation for ship plate steel base on STL mode was proposed in this paper. The line heating path was generated by slicing the STL model of the steel plate using a series of planes, and the models of the heating equipment of ship plate steel were build, and the heating process of ship plate steel can be simulated by inputting the models of the heating equipment into the simulation system that was built by using VC++ and OpenGL. The case study shows that the method can primely solve the inconvenient of manual heating and the whole heating process can be observed by the simulation so that the heating process can be made a reasonable monitoring, and the heating path generation and simulation software are runs stably and reliably.

Abstract: Pile foundation is commonly used in modern structure of deep foundation forms. It is characteristic of good bearing capacity and lower settlement, making convenient and suitable conditions widely, etc. The pile foundation of the design calculation process is complexity. And it is time-consuming difficult manual calculation. It is not achieved satisfactory effect. Because of this, it is imperative to using computer to engineering design. Based on the analysis of the pile foundation of the space and the matrix displacement method, it is taking object-oriented programming method and Visual C++6.0 as system developing platform, parameterized drawing method. It realized the pile foundation of automatic design, analysis, calculation and drawing process. And it is achieving all the functional in the same operation platform system that it can finish from the data input to the graphics output. It greatly improves the system automation level, and improves the pile foundation design work efficiency.

Abstract: In this paper, threaded joint dedicated for the solid expandable tubular is taken as the basic structure and specific parameters for the threaded joint is set. 16Mn improved material is selected as the material, and MSC/Marc software is adopted to conduct finite element analog study on technical performance of the threaded joint and to analyze the distribution and strain condition of microstress and macrostress for the thread after make-up as well as the tensile strength and sealing property for the joint after make-up. Multiple important data concerning the designed expandable tubular threaded joint have been obtained through the study. It is convinced that the solid expandable tubular threaded joint shall adopt be a flush one with both internal and external walls parallel and level with the tubular body, and the type of thread shall take a shape of reversed hook. Besides, the expandable tubular threaded joint shall adopt the sealing structure with the rubber seal as the main sealing type and metallic seal auxiliary.

Abstract: In the current market demand of rapid response manufacturing, the product variant design technology is one of the key technologies. Product variant design principles and methods are first described. Then, product dimension parameter is analyzed and product dimension parameter transferring structure is studied. Applying tree theory to product variant design, a dimension relation driving-tree of components and parts is constructed and the significance of driving-tree statistics and a dimension parameters transfer method are presented. The methods and processes which are applied to variant design and the sorting algorithm of relations are described in detail. A parameterized variant design module integrated with SolidWorks was developed with VC + +. All the above mentioned methods and processes are verified by taking a joint coupling product as an example.

Abstract: Tilting torque of mixed iron car is an important parameter in designing tilting mechanism. In the past, calculating tilting torque of the mixed iron car mostly depended on manual calculation with low calculating speed and calculating precision. This paper adopts Solidworks software to simulate and calculate tilting torque of the 300t mixed iron car, and overcome the above drawbacks. According to the calculating, the tilting torque’s curve can be obtained, which provides a theoretical reference for determining power of tilting motor, designing tilting mechanism and judging the tilting safety.

Abstract: The cartridge endures the load of very high pressure and heat generated from the fired-gas of powder when shooting. The intensity of the cartridge influences the performance of the weapon as well as the safety of user. One brass cartridge snaped in the test. Based on the theory of elastic-plastic mechanics, thermal-stress and contact mechanics, the high fidelity finite element model of the cartridge case and the gun wall is built, which is used to analyze the stress-strain field in the platform of the general FEA software ANSYS. The model is two-dimensional for the axial symmetrical characteristic, and we achieve the parameter model using the ANSYS Parameter Design Language. The resultant position of maximal stress is consistent with the test, and it oversteps the material yield limit, showing the model is high fidelity. The influence of initial gap is researched in detail, and the results indicate that the position of the maximal stress can be adjusted by controlling the initial gap. The data can be used in the modified design.

Abstract: To assess the roller coaster multi-body system security, it is need to extract the running process of kinematics, dynamics, load spectrum and other features, as basis dates of the roller coaster structural design. Based on Solidworks/motion software and in the 3D model, the calculation formula of the carrying car velocity and acceleration is derived, and the five risk points of the roller coaster track section are found by simulation in the running, and the simulation results of roller coaster axle mass center velocity are compared with theoretical calculation results, which error is less than 4.1%, indicating that the calculation and simulation have a good fit and providing the evidence for the roller coaster structure design analysis.

Abstract: Cooling water temperature is one of the key parameters for continuous casting, and it has great influence to the thermal state of the mould copper plate. The coupled visco-elasto-plastic FEM models have been presented for thermal process analysis of steel the mould copper plates. With the understanding to the mould thermal state for different heat transfer coefficient, the characters of mould copper plate thermal state is obtained. It is shown that, when the cooling water temperature increasing, the surface temperature of the mould plate would be higher, but the temperature distribution trend is steady, and at same time, the cooling water temperature has little influence to the equivalent strain distribution, especially for the nodes nearer to the meniscus. Lower cooling water temperature would cause bigger mould copper plate equivalent strain, and induce more surface crack of the strand. For breakout signal catching of this mould, the thermocouple is better to embedded lower than 350mm to the meniscus by vertical, and less than 30mm to the mould cold side by level.

Abstract: By using the traditional Assur Groups method analysis multi-bar linkage kinematics parameters with an advanced plane connecting rod, complex nonlinear equations should be solved. To solve this tedious and error-prone problem，The senior Assur Groups should be transformed into combination of second grade Assur Groups, virtual single component and constraints single component with the aid of the theory of senior Assur Groups transformation. The problem can be simplified. Based on the transformation theory of mechanisms, the eight-bar linkage working device of loader was analysised. The results showed the method could avoid the nonlinear equations, reduce the computation amounts and enhance the computing rate. It could be applied in various forms of senior Assur Groups