Study On Mechinsm And Roller Shape For Two-Roller Bar Straightener

It plays an important role for bar production in the development of national economy. Because of some kinds of reasons, in the process of the heating, rolling, cooling, heat treatment and transportation, bar may have some defaults such as bend of multi-directions. These defaults must be eliminated by straightened in the later process, so that the flat product can be obtained. The production of the two-rollers straightening has the advantage of the high precision and good quality, therefore, the two-rollers straightening take an important role in the straightening product. At present, the research about two-roller straightening is focused on designing of the roller profile in the world; however, the deeper research on the process of deformation is lacked of. Therefore, it has important practical significance and theoretical value to research on the modify rule of the field variable in the process of the straightening.In research, this text according to the deficiency of the tradition two-roller straightening, analysis process of two-roller straightening and principle, establish six-section roller shape. This type roller shape increase pre-straightening zone and end straightening zone, it makes inflection curve coincidence with the gradual change curvature of two-roller straightening, to increase the straightening precision of the two-roller straightening. For proof the rationality of six-section roller deforming and consider the cost of the experiment, this text use the finite element dynamics analysis software simulate two-roller straightening process, and analysis the curvature change in the two-roller straightening process. It proofs that the six-section roller shape was rational and superiority by simulation analysis.By two-roller straightening shape curve, straightening precision and straightening research, in bar straightening assumed foundation up, put forward two-roller straightening precision theoretical calculation formulae, and calculation six section inflexion curvature, syllogism inflexion curvature and monodrome inflexion curvature straightening roller shape and straightening precision, to straightening precision theoretical value with observational data proceed comparison. In this paper, using MATLAB establishment genetic algorithm procedure, understand genetic algorithm roller shape multi-objective optimization example of its application gave out by foundation straightening roller volume count model. Straightening roller bent and juxtaposition metamorphose computational model, straightening precision and straightening energy of deformation computational model, for each with straightening roller volume and distortion least for objective function, with straightening roller volume and straightening precision objective function, be dead against representative bar physical circumstances. Application station made up optimum programming thought out straightening roller diameter with operate incoming material diameter. At the same time map optimize solution and performance track grade bight, to station computational numerical value with real value precede comparison.This paper analyses the result of the simulation, mainly analyses the variation of the stress field, strain field and displace field; analyses the distribution of the residual stress in the bar after the straightening; studies the variation rule of the stress, strain, and displacement at the special point in the whole straightening process, and analyses the speed of straightening and reduction influence on the quality of the final product. By the simulating, the variation and distribution of the stress field, strain field are obtained. This simulation is helpful to the actual producing.Calculated the straightener force and power in given scheme, analyzed the value for straightener theory force, test measured and simulation, the using good effection Acquired in significance for practical application.