Applied Mechanics and Materials Vol. 470

Abstract: This research focuses on the adoption of the six-sigma DMAIC methodology to acquire the optimal combination parameters of sulfur free-cutting steel processes, thus achieving a stable production and reducing costs. The key point to sulfur free-cutting steels production is managing critical variables among the process input and output. In this paper, based on the systematic steps of the six sigma, experimental designs, and quality-related control methods, the optimal variables for the sulfur free-cutting steels refining process are obtained. This success has achieved the average decline in consumption of ferromanganese up to 12% along with annual savings of more than NT$15 million in production costs for the China Steel Corporation in Taiwan.

Abstract: Based on analyzing the mechanism of forming exit burr in drilling, the paper researches the process of forming exit burr in low frequency vibration drilling. The calculate formula of exit burr is achieved after calculate the force of axial and other forces in low frequency vibration drilling, which is also proved the reliability by the experiment. The parameters optimization method is available in order to reduce or mitigate the low frequency axial vibration drilling. It is lay a solid foundation for selecting the reasonable parameters of vibrating drilling process in the theory.

Abstract: According to the rules of six typical spherical reticulated shell nodes, the modeling method and the design macro program is developed for the nodes and the bars of six typical semi-outdoor spherical reticulated shell structures by using the ANSYS parametric design language APDL, so as to achieve the parametric design of six typical semi-outdoor spherical reticulated shells. The modeling design examples indicate that it's convenient to achieve the parametric modeling and design of semi-outdoor shell with given span S, rise high F, number of hoop symmetry areas kn, radial node cycles of whole structure nx and the upper removed laps ns, which provides big convenience for the force analysis and the optimization scheme comparison of semi-outdoor spherical lattice shells with varied types and geometric parameters.

Abstract: As we all know, the thickness of the shield lining segments, reinforcement ratio and other parameters of the design have a direct impact on the economics of the project. We have taken a model of parametric analysis simulation and by the way of changing the parameter of lining segments to research their deformation and stress. Finally, we get the relationship between the characteristic parameters and the deformation and stress of the lining segments, and summed up the characteristic parameters which are more influential.

Abstract: The pump height (ΔH) of liquid A356 alloy by the plane induction electromagnetic pump supplying liquid aluminum alloys during casting was measured, and the experimental values agreed with 3D simulation results. It was found that the relationship between ΔH and frequency was relevant with structural design parameters, and the increase of ΔH versus frequency started to deviate from linearity when the width of the pump ditch (b) was higher than that of the iron core (W). ΔH was found to be always proportional to the square of the current and irrelevant with frequency and structural design parameters. It was also found that ΔH decreased significantly with the magnetic gap and increased with W and the thickness of the iron core, while ΔH was not affected by the polar distance. In addition, ΔH increased first rapidly and later slowly with b till the maximum was reached, after which ΔH started to decrease slowly with b.

Abstract: Metal Rubber made by the specific process has excellent mechanical properties. Spiral coil winding is one of the keys in the process of forming Metal Rubber. This paper introduces the forming principle of the metal rubber spiral coil and the control of resilience amount in the forming process. A Spiral roll forming machine is designed for Metal rubber and it can be controlled automatically.

Abstract: In order to make product maintainable, maintainability engineering encourages sufficient focus on product maintenance at early development stage, and systematic maintainability design throughout product development and design. Maintainability and other life cycle aspects should be concurrently design into product. Integrated maintainability information model is established. Based on product assembly information model, the components of integrated maintainability information model, and how to integrate this model with design process model are discussed respectively. With Pro/INTRALINK as product data management platform, an integrated environment which supports concurrent maintainability design and its establishment steps are explored, including configuring basic environment, establishing master information model, defining and managing design flow, which provide and effective methods for concurrent maintainability design.

Abstract: As a new flexible rope transmission solution the structure and principle of the flexible rope transmission device was introduced firstly. Then the rope-tube mechanical model about interaction between rope and flexible tube was established. On the basis of the model, the factor affecting rope-tube transmission performance was studied especially coefficient of kinetic friction and Elastic modulus of flexible tube. After that, the design calculation method of flexible rope transmission was developed through the design calculation on rope-tube mechanical model. Lastly, a design example that a 6-DOF light-load serial robot equipped with three wrist joints based on flexible rope transmission was invented, and it performed well in application test. So, flexible rope transmission is a feasible transmission solution indeed, and may have broad prospects as well.

Abstract: In order to satisfy the requirements of light weight and high stiffness for NC isothermal hydraulic press, a method of lightweight design for lower beam is proposed. Key geometric parameters of lower beam affecting mass and stiffness are extracted as design variables. Latin hypercube sampling is used to produce samples of design variables in order to explore relationship between stiffness, mass and design variables. Calculating data are processed with second order stepwise regression and regression equations for stiffness and mass are obtained. Mathematical model for lightweight design is established by regression equations. The goal of lightweight design is to decrease mass of lower beam while stiffness is set as constraint. When lightweight design is finished, the mass of lower beam is decreased by 11% and its stiffness remains unchanged.

Abstract: Mechanical rotary table ^[ has been widely used in many work applications, where rotating capacity and power of the table are necessary elements to ensure the operation safety. The paper provides a rotary table design operated by hand movements to lift and fall, rotate and turn over in the absence of electricity and other external powers. Therefore, table should have a simple structure and be easy to maintain, meanwhile working area should be wide enough for convenient operation. Simultaneously good safety performance is of great significant in this design, which requires a reasonable arrangement of each components position to minimize the number of dangerous sections. The rotary part applies commonly used clamping flange, which allows the table to clamp different types of components. Mechanical rotary table can be applied in many different occasions, making it a truly multi-functional workbench.