Applied Mechanics and Materials Vols. 713-715

Abstract: The hollow Be rotor is a spherical rotor with high accuracy, it has been grinded by the four-shaft-ball lapping machine. The rotor is a hollow sphere with non-uniform wall structure and there are errors between geometric center and mass center. Analyze the affect of eccentric distance and harmonic coefficients to the working condition of the rotor, establish the kinematic balance equation of rotor that is solved by Matlab software, and draw the rotor motion law with the change of time. The results indicate that with the decrease of eccentric distance of the rotor, the influence of damped motion decrease significantly. The influence on the damped motion of the rotor can be negligible when the eccentric distance is less than or equal to 0.051μm. The larger the harmonic coefficients, the faster the rotor attenuate.

Abstract: In the area of grinding, ordering the abrasive gains is one of the key ways to improve the grinding wheel performance. In this article, the experimental investigations on the grinding temperature were carried out including using the superhard abrasive grinding wheel with phyllotactic, matrix, dislocation and disordered configuration, the temperature distribution of the grinding workpiece surface and the effects of grinding parameters on the temperature of workpiece surface have been obtained. The experimental results showed that the grinding temperature can be reduced efficiently by choicing the grinding wheel with abrasive phyllotactic pattern.

Abstract: Cold shearing machine is the machine equipment often used in metallurgical industry to shear head, tail and fixed length of rolled piece. The shearing movement of cold shearing machine can be realized by crankshaft driving link rod with relative up-and-down motion. Load on crankshaft is comparatively big. In this paper, cold shearing machine crankshaft was taken as an example. The three dimensional model of relative cold shearing machine crankshaft was constructed by SolidWorks software. Strength finite element analyses on relative model were made by static analysis module attached to SolidWorks software under maximum load working conditions. The overall displacement distribution pictures and overall Von Mises stress distribution pictures of cold shearing machine crankshaft under relative load working conditions were obtained. This research provides important reference base for the design and reform of cold shearing machine crankshaft.

Abstract: The study on dynamical model of wheel and rail of high-speed train has attracted many researchers nowadays. According to the damping force and the dry friction between wheel and rail, the dynamical model of wheel and rail of high-speed train is constructed and the Hamilton dynamical system of this model is analyzed to discuss its nonlinear dynamical behaviors, which will benefit the practical engineering of high-speed train.

Abstract: In order to improve the anti-vibration performance of the Ball Grid Array solder joints, its solid model is established in ANSYS. Analyzing the stress response under the shock and vibration environment by using the finite element method. Then discussing the stress response of solder joints with different diameters and different heights in the same shock and vibration environment of each location for providing the basis for anti-vibration design. The results show that the longer diameter and lower height solder joint is more favorable to improve its anti-vibration performance.

Abstract: The performance of lock-rope mechanism affects the safe and efficient operation of mine hoisting system directly. The lock-rope mechanism with wedge angle 5° was designed by the mechanical analysis of wedge lock rope. Its entity model was established and the dynamic process of working is simulated by using the ANSYS/LS-DYNA. The results show that the wedge lock rope mechanism has the ability of self-locking. The strengthening institutions can largely eliminate the relative slip momentum between the lock-rope wedge-block and wire rope, which make the movement trend gentle, reduce the wear between the lock-rope wedge-block and wire rope and improve the security of wedge lock-rope mechanism effectively. The local equivalent stress of lock-rope wedge-block and wire rope are both present in the increasing distribution gradually from the upper to the lower.

Abstract: Material properties and geometry of the safety coupling of the safety pin has a random uncertainty. Limit torque passed by coupling is a random variable. Limit torque variation within the interval Tmax and Tmin Reduced Mechanical Propertiematerial of material and the size dispersion characteristics in the design of the safety pin is a question that can be considered in the design principle of probability. It can make the technical requirements of safety and limit the scope of changes in the coupling strength of the material limits. Probabilistic design principles proposed design safety couplings used safety pin number

Abstract: This paper carries on the simulation and optimization of hydraulic system, which focuses on the high energy consumption problem of large-scale blow molding machines. According to the characteristics of long work period and great fluctuation of flow demand, the paper designs the oil supplying system that can match the actuators’ hydraulic energy demand, introduces the working process of each component in the system, and analyzes the key technology of hydraulic system as well. The design and research avoids the shortcomings such as more components, complex debugging, discontinuous control and unstable operation, substantially reduces the installed capacity of variable pump and driving motor, and in the meantime, solves the impact problem of actuators effectively, which can make hydraulic system high efficiency, energy saving and run steadily.

Abstract: Tire crushing body is divided for the purpose of separating the wire. Wheels of Steel Shares will be made by a single, Stripping the wire and colloidal by roll extrusion. The tread belt layer composed of steel wire rope is made. Peel method using a roll extrusion method can not. It is after stripping tread peeling rope belt layer to peel. Tread was cut into strips at first, then stripped from steel tread belt layer surface,.With a layered approach to rope belt layer stripped from the carcass . You can use sliced ​​or milling method to release the rope. Sliced ​​on the rope can form a sheet body peeling. Milling peeling green tape layer is formed on the wire cutting and tearing. Dividing the body on the fixed milling peeling easier.

Abstract: A fatigue life assessment method of steel structures was proposed in this study and applied in a metallurgy crane. Analytical method and experimental analysis were adopted to evaluate the static strength of steel structures, and then dynamic stress test was applied to get the stress history in a whole working cycle, which could determine the interest point and stress spectrum. Finally, rainflow method was applied to approach the stress spectrum, and then the fatigue life was predicted based on Miner rules. The results indicated that this method showed a potential application in practical engineering.