Papers by Keyword: Deformation Resistance

Abstract: This article presents the results of the effect of drawing speed on the strain rate and resistance to plastic deformation. The wire drawing on modern high speed wire drawing machines significantly increases the required amount of drawing dies. The influence of the technological parameters: speed drawing, half-angle of the die, wire diameter and a single strain on the rate of deformation of the metal. The influence of the technological parameters: speed drawing, half-angle of the die, wire diameter and a single strain on the rate of deformation of the metal. It is found that increasing the resistance to drawing dies and achieve passport velocities drawing, when selecting process parameters drawing guided by the principle of uniform strain over the cross section of the wire by matching the single strain with half-angle dies and friction coefficient on the formula given in the article.

Abstract: In this paper the authors present the results of a study of plasticity and deformation resistance of the number of structural steels at temperatures of hot rolling. The patterns of changes in the studied characteristics of steels in the range of rolling temperatures are determined. In order to improve the quality of rolled products, we developed and substantiated recommendations for optimizing temperature of rolling ingot of the studied steels. The proposed recommendations have been verified by computer simulation of rolling high billets in flat rolls after heating up to 1100 and 1200 °C. For example, we showed the distribution of strains and stresses throughout the volume of the rolled product from steel grade 38KhS (State Standard GOST 4543-71).

Abstract: With the rapid development of automobile industry, automobile panel material has also gained great attention, the IF steel has got more and more applications in automobile panel production for its excellent deep drawing propertie s, such as, high strain ratio, high extensibility, high yield ratio, etc. In this paper, through the analysis of thermal simulation results and microstructure of IF steel, we studied the influences of microstructure changes on IF steel with different deformation parameters, obtained the influence laws of the deformation parameters on deformation resistanc e of IF steel. So there is a certain directive significance to control the rolling process of IF steel in the actual production of IF steel.

Abstract: The hot-rolling deformation resistances of a TRIP Steel were studied by using a Gleeble-3500 thermal simulator. The true stress-true strain curves of the TRIP steel is determined under different hot-rolling deformation conditions, and the effect of deformation temperature, strain rate and deformation amount on the deformation resistance was evaluated. Based on experimental results, the mathematic model for the calculation of the deformation resistance of the TRIP Steel has been set up by the regression analysis by means of the origin software. It is found that the simulated stress-strain curves have good curve-fitting performance.

Abstract: Plastic deformation resistance is a basic parameter of mechanics parameters in press work theory and technology. In this paper, the influencing factors of deformation resistance are analyzed and the model of deformation resistance is established. The deformation resistance can be calculated by program with Lagrange interpolation method. This result provides evidence for calculating mechanics parameters and designing metalworking equipment.

Abstract: To quantitatively analyze the structural topology and control the elastic deformation of die structure in stamping, a new die structure design method was proposed. The forming analysis was conducted based on the die surface mesh generated in the third-party software. Structural analysis models were established according to the die surface mesh and deformation resistance obtained from forming analysis results. And then, the structure analysis and optimization were carried out. This new method for structure design of stamping die has two advantages. First one is the combination of forming analysis and structure analysis makes the structural optimization procedure more practical. Secondly, the coupling of topology optimization and shape optimization makes it possible to fundamentally change the structural topology and it is a new attempt to mold design.

Abstract: Considering the insufficient recrystallization of austenite has an effect on deformation resistance, meanwhile, referring to the plate of controlling parameters in the hot rolling process, analysis and forecast of load parameters of rolling mill and motor per pass of its rolling process. The result shows that: The production of modern steel rolling, involved in the process, equipment problems associated with rolling load, must be taken into account in its internal organization of metal in the deformation process. The less recrystallization is, the greater the deviation of the calculated results. This should be distinguished from the traditional concept of rolling.

Abstract: Most of the industry oriented research and development is based on conventional casting alloys Al-Si. This paper presents the results of deformation the hypoeutectic AlSi7Mg alloy used to manufacturing pistons for combustion engines. This is the material about high plasticity and corrosion resistance. For the research it was produced by semi-continuous casting process with magnetohydrodynamic stirring in crystalliser (MHD) and in conventional casting way. The results of deformation resistance of both materials have been described.

Abstract: By multi-axis active load deformation method, the equivalence diameter tee joint was formed on multi-axis numerical control hydraulic press machine. The loading route was determined by numerical simulation. The experiment results showed that two loading method can complete form the parts. The different directions metal flow was observed under multi-axis loading conditions. To simplify analysis, the flow field was divided into several regions. In every region, the metal flow direction was only one. In multi-axis loading, the way of deformation follows priority deformation principle: The metal flows only choose one direction even if the work piece were under the complicated coupling field condition. The mathematical model of the deformation force and metal flow rate was established. The theoretical calculation had been provided.

Abstract: A test study of deformation resistance of S50C medium carbon steel in hot rolling process was conducted by using Gleeble 3500 Thermal-mechanical testing machine. The relationship of deformation resistance with different deformation temperature and deformation rate and deformation degree was analyzed through the stress-strain curve of S50C medium carbon steel which measured in the test. The results show that the deformation resistance increase with decrease of deformation temperature and increase of deformation rate and deformation degree. The math model of plastic deformation for metal of tested steel is established by using 1stopt software with multi-component non-regression. The model is proved has good curve fitting characteristics though a regression analysis of the model, it can be used provide theory basis for the formulation of rolling process and calculation of the mechanical parameters.