Materials Science Forum Vols. 697-698

Abstract: The Standard and Explicit solver of ABAQUS were synthetically used to establish finite element model for reciprocating multi-pass rough rolling of large H-beam, in which the re-meshing technique was utilized to solve the problem of excessive deformation and rollers’ deformation were taken into simulation to increase the accuracy. Based on the simulation results, stress field, thermal field and deformation behavior of the workpiece were discussed. It clearly showed that the main deformation of profiled blank in rough rolling was web broadening. Compare the analytical rolling force results to the practical rolling process, and this method could provide some valuable references to the rolling practice.

Abstract: In the paper, a lightweight design method for tailor-welded blanks (TWBs), termed as Topology Tailoring Method (TTM), is proposed, which is based on topology optimization philosophy and in which the variable density method is employed so as to reach the goal of the smallest structure strain energy. By using this method, a TWB autodoor subjected to a specific working condition is topologically optimized in HyperWorks, thus obtaining the more lightweight autodoor. At last, a side impact simulation of the autodoor is demonstrated, thus showing the effectiveness of the method.

Abstract: A new type of steering system so called Ackerman active steering system is put forward through combining the active steering with Ackerman geometry theory. The application of axiomatic design concepts to the steering system design is presented. The fundamental function requirements and the relative design parameters of desirable steering systems are introduced according to the trend of steering system evolution. The uncoupling control system is proposed and the simulation is conducted to verify the concept. The result shows that the coupled system can be converted into an uncoupled one via further design on control system.

Abstract: In this paper, the universal nonlinear finite element software LS-DYNA is applied to the explicit dynamics simulation of shield’s soil cutting in tunneling, and using Non-reflective boundary of DYNA’s module, accurately conduct the dynamic analysis of shield’s tunneling. Finally Making visualization processing on the computed results with the post-processing soft LS-PREPOST. Compared with results of static’s simulation and small-sized shield experiment indoor, the explicit dynamics simulation used in the paper is in good agreement with them. Through the alleosis chat of internal energy, we can see that LS-DYNA can be commendably utilized to explicit dynamics simulation of soil cutting of shield’s cutter, simultaneously, we also concluded that moderately increasing the cutter opening rate will have a significant impact on improving the unearthed rate of soil residue, tunneling efficiency and lowering the total thrust force of the shield.

Abstract: The efficiency-reinforcement design framework for hydraulic reciprocating seal is proposed, and the function attributes analysis model for reciprocating seal system is built. Through analyzing the components, functions and attributes of elastomeric hydraulic reciprocating seal system, the attributes that influence seal efficiency-reinforcement are identified. By eliminating the function attributes that lead to seal leakage and seal failure, and/or by improving the function attributes that are insufficient in seal, the efficiency-reinforcement design concept can be obtained. A new seal efficiency-reinforcement design solution is also present using this method.

Abstract: The rational and effective partition of the module has been the vital significance to the product design and manufacture. In this paper, a deficiency about the existing module partition can’t satisfy customer personalized is pointed out. Therefore, a method is put forward based on the design method of axiomatic, by analyzing the correlation among the parts, combining the dynamical clustering and mathematical statistic calculation to achieve the rough-to-fine division according to the principles of module partition. Finally, the based modules and the personalized modules are determined through the choice of based parameters and personalized parameters. The basic module and personalized module are integrated on a personalized product platform base on Internet. Customer can directly involved the product design by personalized product platform. The model was explained with example of the gantry grinding machine tool.

Abstract: Large gantry machining center can be applied to large diameter and thickness of the flanges, tube sheets and other large sheet metal processing, the industrialization of this type of device for improving the development of modern processing and manufacturing of great strategic significance. The design and optimization of large-scales heavy gantry CNC Machining Center was mainly investigated in this paper. The finite element model of the beam structure was structured by using finite element analysis software-ANSYS. On the basis of analysis results, the optimal static and dynamic performance of square cross-section of the beam structure has been obtained. The maximal displacement is 0.531 mm. The maximum displacement of X=0.0329mm, and Y=0.531 mm occurred in the contact point of middle beam and spindle box. Z is 0.0948mm. The maximal displacement of Y-component is occurred in the contact points of guide and spindle box. This may have a certain impact on the machine processing accuracy. In the middle of the beam can consider to strengthen its internal structure, such as adding reinforcement measures to further improve its rigidity, and improve the machining precision of the whole machine.

Abstract: This research introduces a robust design approach using engineering models described by implicit mathematical functions. In this paper, the scheme to describe the engineering models using implicit functions is explained first. The relationships between product functional performance variations and design parameters are then derived from these implicit functions. An optimal robust design model is subsequently introduced to minimize functional performance variation. A case study is given to illustrate the effectiveness of the robust design approach with engineering models described by implicit mathematical functions.

Abstract: This paper describes a new steering actuator of static “point-the-bit” rotary steerable system (RSS). It works by controlling the bias unit to give the mandrel an offset to the original axis, so as to drive the drill bit deviation from the borehole axis. The bias force is provided by the hydraulic cylinder. The steering actuator introduces two universal joints, which effectively improved the conditions of bearing high alternating stress, and the build up rate of the system. Mandrel’s static and kinematic equations were established on the basis of simplifying the mechanical structure model of the mandrel and bearing. Bending angle and deflection curve equation were derived and the position of the hydraulic cylinder was optimized. At last, the paper gives the control model of the bias unit.

Abstract: This paper proposes a method of building the design tree with stratified constraints and modifications for the machine design with pre-defined technological process. The design method displays the design process in a tree structure with overall open yet local convergent characteristics. It is applied to develop an innovative, a comprehensive, and practical design through design detailing, integrative constraints and interventions, and real-time evaluations. As an example the design of the tire-building drum is given.