Applied Mechanics and Materials Vols. 395-396

Abstract: "N-2-1" principle is widely recognized in the fixture design for deformable sheet metal workpieces, where N, the locators on primary datum, is the key to sheet metal fixture design. However, little research is done on how to determine the positions of N locators when considering normal deviation. This paper, concerning the low efficiency of the locating point optimization method using the finite element model, proposes a GA-BP neural network to predict the sheet metal deformation under different locator layout, by which to calculate the clamp normal deviation. Finally, a case is used to illustrate the flowchart of GA-BP network. Results show that the method has good performance and prediction ability.

Abstract: Using physical and numerical simulation method，metal delivery system of twin-roll casting magnesium alloy process was researched. The Anycasting software was used to simulate different flow systems by VOF method. And based on similar principles, an acrylic experimental model with the ratio of 1:1 was designed. The dam’s size and position were optimized by simulations and experiments. The flow distribution is uniform along the horizontal of the casting roller. Numerical simulation and physical simulation are in good coincidence.

Abstract: Based on the principle that in the deformation zone the length of bore plain wire does not change, a mathematical model of the prefabricated hole for flange-forming of square hole tee pipe is established, for the difficult problem of the flange-forming prefabricated hole size design for square hole tee pipe. To solve the mathematical model, a numerical method and a software system for the mathematical model is established. In order to verify the reliability of the mathematical model and its solution, the method of finite element simulation is applied to verify the mathematical model and the solving system. The results show that the mathematical model constructed in this paper can relatively accurately make calculation of prefabricated hole size for flange-forming of square hole tee pipe.

Abstract: In addition to the consumption caused by wear,thermal cracking and flaking,the roller ring of universal mill often occurs the roll-off accident in the rolling production. In this paper,put universal mill’s horizontal roll ring as the study subject, analyze its fatigue life using fe-safe software and estimate the fatigue life of roller ring, which has a certain reference value for the Time selection of Roll change and roll grinding .

Abstract: The error modeling compensation method for improvement the machine tools accuracy has been extensively used in the past decades. To unify the multi-error model for four types CNC machining center, the comprehensive multi-error model of TXYZ type machining center was established based on the homogenous coordinate transformation. According to the analysis of the transmission chain, a unified multi-error model for four types machining center was established based on the Singular Function. Using the unified multi-error model, the mathematical model of four types machining center can be standardized. It is very important for unceasing development of error compensation technology.

Abstract: The dynamic property of carbon filled rubber materials is related to pre-load, excitation frequency and amplitude etc. A model by superimposing an elastic model, a viscoelastic model and an elastic-plastic model is presented to model the dynamic property of a rubber isolator. In this paper, this approach is adopted to calculate the dynamic property of a rubber isolator. It is shown that the presented model can predict the amplitude and frequency dependency of a rubber isolator with small relative errors. The validity of this model is verified by experiment. The approach described in this paper can be used in the design and calculation for rubber isolators.

Abstract: A mathematical model of evolution process is adopted to simulate orientation distribution of fibers suspensions in planar extensional flow, i.e., specific form of Fokker-Plank partial differential equation and Jeffery equation. The analytical solution of differential equation on forecast fiber orientation distribution is deduced.

Abstract: Some kinds of abnormal events occurred possibly during casting process have been taken into full consideration in the slab quality online diagnosis & analysis mathematic model, CISDI_SQDS ONLINE R2011, the effects of which on relevant crack formation index have been introduced into the model in terms of the event level. As for the capture modes of event status, there are two styles, one is manual set mode, the other one is automatic judgment mode. And also, the effect ranges of all the events in the casting strand have been discussed respectively. The mathematic model has been put into industrial application successfully in Xinjiang Bayi Steel, which shows obviously that, the capture method of event status is accurate and reliable, the influence factors of events to quality defects are reasonable and can reflect the effect degree normally.

Abstract: The finite element analysis software soft ANSYS is used for researching H-beam hot rolling finite element model, temperature field and stress strain field. Then find the changes law in different water cooling conditions of the temperature field temperature distribution and the stress strain field. Find the heat coefficient of H-beam by using the optimization analysis to reduce the differences of the temperature and the stress strain value, and also reduce the deformation in H-beam cooling process. The controlled cooling parameters of H-beam under optimal conditions are determined by the simulation experiment and comparative analysis. While exploring the changes of H-beam microstructure, stress and hardness can provide the reference for the making and designing of reasonable controlled cooling technology.

Abstract: The deformation process of stainless steel particle sputtering on copper substrate to make coat was simulated by ANSYS/LS-DYNA software in the paper. The results showed that: when the steel particles are sputtered on the copper substrate, the contacting place of copper substrate with stainless steel particle top generates maximum stress and strain firstly, and then stainless steel particle shrinks from the bottom to the center, while the top flattens to the both sides. Subsequently, the bottom of the particle gradually spreads along the substrate with the stress increasing gradually, while the strain distribution and top of the particles basically unchanged, then, the particle flattens and its stress gradually spreads to particle interior, at the same time, the bottom of particle gradually shrinks and its top gradually expands to the end. Through analyzing equivalent stress and strain distributions, the kinetic and internal energy distributions of sputtering particle unit and substrate unit contacting together, the variation rules of mechanics and energy parameters in the sputtering process are elaborated further. It laid an important theoretical basis about exploring the basic laws and mechanics parameters variation in magnetron sputtering coating process.