Applied Mechanics and Materials Vols. 37-38

Abstract: By a study on the theory of generation processing arc face-gears, a machining method was designed by generation characteristics on the arc face-gears pairs. Based on coordinate transformation principle and meshing equation, the arc tooth surface equations were derived and corresponding 3D model was build. It verifies the feasibility of generation processing the arc face-gears. Conjugate enveloping guarantees precise action on the arc face-gear pairs. Gear surface generated by machining angle, curvature features are improved which is helpful to obtain top-quality transmission. Independent cutting major movement achieves high-speed and high-precision process. It is convenient to generating arc face-gears by using the general multi-axle numerical control machine with the common Gleason Cutter. The manufacturing process is simple.

Abstract: Gear is a widely used common part of machinery, which is of good lubricate property and low materials consumption when it is made of sinter powder material. In this paper, the chemical composition, microstructure and property of sintered gear were investigated with optical microscope, scan electronic microscope, micro hardness meter and X-diffraction energy spectrometer. The results show that the microstructure of the gear includes of tempered martensite, carbide, residual austenite and a small quantity of cavity. The distribution of iron element is even. The copper and nickel distribute unevenly and cover around the surface of carbide in gear material which makes different property of covered layer itself between carbide and base material. The existing of covered layer and weak grain-boundary strength are main reason for gear brittle fracture. The gear’s toughness can be increased by optimizing sintering technology and heat treatment.

Abstract: The broadening stage is the main stage in Multi-wedge Synchrostep Rolling railway axle by Cross-wedge Rolling. Based on the rotated theory of Multi-wedge Rolling, through using Ansys/Ls-Dyna FEM software, This paper provides a systematic analysis of the stress-strain in the broadening stage of Multi-wedge Synchrostep Rolling railway axle by Cross-wedge Rolling. Through this study, it is obtained the stress-strain distribution and evolution on Multi-wedge Synchrostep Rolling railway axle by Cross-wedge Rolling. These research conclusions can provide scientific basis for Multi-wedge Synchrostep Rolling railway axle by Cross-wedge Rolling.

Abstract: The cold-rolled production line of double-line continuous electrolytic pickling is quite common in the manufacture of all kinds of small-diameter cold-rolled thread steel. This paper studies the main technology parameters, the main device with the structure characteristics and the principle of the cold-rolled production line of double-line continuous electrolytic pickling, and then analyzes on the experiments and on the technological economics for the small-diameter cold-rolled thread steel. The results show that its production line is convenient in operation, accurate in processing, efficient and adaptable in production. The small-diameter cold-rolled thread steel produced by this production line has high strength, large plasticity and good yield performance and bending characteristics. It can greatly improve the performance of reinforced concrete structure and prestress reinforced concrete structure, increases the quality of components, and saves steel about 15%. So it is a high efficiency, energy-saving steel. Small-diameter cold-rolled thread steel is widely used in the construction industry with very significant economic and social benefits, it plays an important role to accelerate the economic construction of China.

Abstract: The self-moving Silent Piler based on the pile reaction force is a new kind of construction equipment by static pressure hydraulic pressure, which utilizes reaction force derived from fully installed cement column to support the silent piler body. The construction characteristics and working principle of the silent piler have been discussed in this paper. The structure of the device has been designed. The FEA to the main stress components and force has been analyzed.

Abstract: LED die bonder is a high precision packaging machine and needs proper tolerance design to ensure its high performance requirements and low manufacturing costs. The related tolerance design methods, such as worst-case method and statistical method, mainly focus on two-dimensional cases in tolerance design. However, tolerance design for LED die bonder needs to deal with three-dimensional cases. To solve the problem, a new method for tolerance design based on Multi-body systems is presented. According to the motion characteristics of the related assembly component parts of LED die bonder, the motion equations in ideal and actual situation for die bonding are given respectively which use the principle of Multi-body systems and the homogeneous transform matrix. By solving the motion equation, we can obtain the tolerances of the related assembly component parts.

Abstract: By using the good time-frequency localized nature of the wavelet transformation and self-learning function of the traditional artificial neural network, this paper constructed a wavelet neural network model for the blemish signals in ultrasonic testing of the nickel-based superalloy GH4169, and it could recognize types of the blemish signals. The results show that the method is effective in fault diagnosis. Finally the article has confirmed its feasibility and superiority.

Abstract: Uniformity on mixing several types of granules is closely related to particle sizes, especially when microcomponents are involved. In this article, we report our theoretical analysis on the relationship between the uniformity and granule sizes using the principles of probability and statistics. New computational formulas that relate the coefficient of variation and granule sizes have been deduced. Classical formulas usually require the sizes of all granules to be the same. This restriction has been removed in the new formulas, which can be applied to any granule sizes. Using these formulas we have performed calculations on the normal distribution and logarithmic normal distribution using common granule sizes.

Abstract: In accordance with integral structure of woodworking machine tool (WMT), this paper uses the method based on topology optimization design to establish the objective function, constraints, and convergence Criteria. In the meantime, some related factors of woodworking machine tool (WMT), such as economical efficiency, stability, and dynamic properties are taken into consideration. Moreover, through analyzing an instance, the validity of design method has been demonstrated.

Abstract: Movable platen is key component of a plastic injection machine. In this paper the movable platen of HBT80X/1 plastic injection moulding machine is redesigned using topology optimization method. The SIMP method and OC method were applied as the optimization principle and Optimality Criteria. After given the topology structure, the refined structure is designed with experience. The results show that the weight and maximum placement of the new shape were 53Kg and 0.009mm less than the original design.