Improvement on straightness of metal bar based on straightening stroke-deflection model

Abstract

The straightening technics is one of important means to improve the straightness of metal bar. A novel way of predicting the straightening stroke is proposed based on mathematical methods and bending experimental and numerical simulation. The experimental and numerical simulation is conducted by following the mathematical load-stroke model of press straightening process under the elastic-plastic theory. For the linear guide rails, as an example, the stroke-deflection model focusing on the straightening stroke prediction can be achieved by contrasting and integrating the bending experimental results and finite element methods (FEM) simulation data. And then the formula for predicting the straightening stroke is presented based on the precise straightening stroke-deflection model. The stroke prediction formula with high precision can be applied to the straightening stroke prediction in the high straightness metal bar manufacturing process and automatic straightening machine conveniently

Research on the Straightening Stroke Prediction Precision of Guide

“…If δ b =δ r , output the guide. Otherwise, repeat the above steps until the guide straightness is up to the standard [5]. Bending theoretical model based on load and deflection; (3) Elastic-plastic analysis model of the straightening process deflection.…”

“…In addition, there are other two models. One is the above theoretical prediction model, the other one is the FEA prediction model [5]. As shown on Fig.4.…”

A General Stroke-Based Model for the Straightening Process of D-Type Shaft

“…The elastic-plastic analysis and mathematical modeling were explored for different parts, and several straightening algorithms were developed based on the curvature and load control. [7][8][9]. Zhang et al [10] established a straightening stress model based on elastic-plastic deformation theory and material loading characteristics.…”

“…Ma et al [6] analyzed the phenomenon of neutral layer shift during the elastic-plastic deformation, which is helpful for the curvature research of the special section shaft straightening process. The elastic-plastic analysis and mathematical modeling were explored for different parts, and several straightening algorithms were developed based on the curvature and load control [7][8][9]. Zhang et al [10] established a straightening stress model based on elastic-plastic deformation theory and material loading characteristics.…”

A novel control strategy for the multi-step straightening process of long/extra-long linear guideways

“…Lu et al. 8 proposed an improved stroke–deflection straightening model based on the load–deflection bending model generated by the elasto-plastic bending theory and three-point bending experiments. Kosel et al.…”