Applied Mechanics and Materials Vols. 427-429

Abstract: This paper introduces a new type vacuum vulcanizing machine structure characteristics, the machine can realize the automatic mold, mold release, flip, ejector, has a high degree of automation, high precision products, high production efficiency; and to study the model of vacuumizing plate vulcanizing machine and physical and mechanical properties of ordinary vulcanization machine the influence of the vulcanizate by experiment.

Abstract: Polycarbonate/poly (lactic acid)/(PC/PLA) blends were modified by two kinds of POSS, glycidyl POSS (G-POSS) and Octa-ammonium POSS (O-POSS), respectively. The morphologies and mechanical properties of blends were investigated systematically. The results showed that the adding of O-POSS has a better effect on the compatibility of blend than adding G-POSS, the separate phase is invisible in the morphology of blends, and the mechanical properties of blends are improved significantly with the increase of added O-POSS.

Abstract: A newly designed injector is presented high pressure common rail system. The whole injector system was seen as a single degree of freedom linear system and the dynamic equation of the system was established. And the equation was solved for the expression of throttle valve opening without bounce between needle valve and valve body. The analysis on the impact of the bounce to the valve opening effect is gained through initial velocity, and a large bounce with small damping will get stronger which cannot curb anymore.

Abstract: Clamping mechanism was important for the working performance of die-casting machine. There were many factors such as various design variables and complex parameters during the design of the double-toggle clamping mechanism for which the high performance of die-casting machine could not be realized and the expansion force coefficient was small. In this paper, aimed to the design of the large clamping machansim for 25000KN die-casting machine, based on the analysis of the motion feature, the multi-body dynamics equation was construct, and the different design parameters in the optimal design math model were optimized and analyzed with the help of the MSC.ADAMS software. From result, after optimized, it was found that the expansion force coefficient was 23.59, the distance of stroke for the moving platen was decreased 20.3%; the clamping force was added to 3.25+e⁷N and the course of clamping mould was more stable which mean that the impact exerted on clamping mechanism was reduced. According to the optimized design proposal, the strength check for clamping mechanism was computed by numerical simulation, from the result, the design requirements were realized. And it supplied the technological reference for assurance of quality and performance of die-casting machine, based on which the prototype of 25000KN die-casting machine was manufactured.

Abstract: Both rotary ultrasonic machining (RUM) and conventional grinding (CG) experiments were performed on the glass BK7 specimen to investigate the effects of high frequency vibration on the surface quality. The surface morphologies produced in the two machining processes were assessed and the associated material removal mechanisms were explored. Also, the influence of the spindle speed on the surface roughness was discussed. It was found that the mechanisms of the material removal involved in the RUM process were material pulverization and brittle fracture, while ductile flow and brittle fracture prevailed on the material removal in CG process. The increased spindle speed would reduce the lateral cutting depth of each abrasive, and promote the shielding effects of the lateral cracks generated by the previous abrasive, leading to the reduction of the surface roughness in both RUM and CG processes.

Abstract: The concept and connotation of the non-pneumatic tires were defined based on safety problems caused by punched and bursted tire. The types of the non-pneumatic tires were classified and the representative products were introduced and the developing trends were predicted. The necessity and feasibility of developing non-pneumatic tires with safety, versatility and efficiency were put forward and discussed.

Abstract: This paper consider the collision of hammer to pile driven into two layers foundation base, piles bearing side friction q₁ ≠ q_2, applies the theoretical basis of longitudinal collision of elastic bars and method of wave propaganda DAlember, determine the velocity of pile heads in the time interval, compress work of elastic buffering on pile head, from the calculation of coefficient of energy transfer from hammer to pile, choosing pile head buffering and hammer heads according to the coefficient of energy transfer calculated.

Abstract: Post-welding annealing and aging treatment are commonly used to reduce welding residual stress and post-welding deformation. However, both show their limited effect in the application of large workpieces. Present study attempts to explore the residual stress state and post-welding deformation law of large workpieces by improving the production technology of the important workpieces of certain engineering equipment a large cylinder assembly. It is proposed that the deformation induced by post-welding residual stress can be effectively compensated by increasing the dimensional accuracy in cutting processing. In this way, aging process is replaced and qualified products can be obtained in a much shorter production cycle.

Abstract: Basing on the theory shock longitudinal of solid body into elastic bar, authors define speed of the piles weighting canter in shocking time, they also define kinetic energy of weighting canter and define vibration energy of the pile driven in two layers foundation base, pile bearing side friction q₁#q₂ pile bottom encounters constant resistance.

Abstract: To evaluate the safety of a steel box bridge during the construction of a metro station, the process of excavation which was based on the metro station and its overpass bridge in Chengdu was analyzed. A detailed FE model was established which include the soil, the station and the bridge using general finite element software ALGOR. According to the procedure of the constructing station and completed station, investigating the absolute settlements and differential settlements of the earths surface and foundation in metro station incidence, the effect on the steel box girder overall stress and local stress was analyzed extensively. The results demonstrated that the excavation has a insignificant influence on the deformations and stresses of the steel girder. Thus it provides an important understanding of the interactions of bridge structures and underground constructions.