矯直模型和精密直線導軌矯直行程的預測外文文獻翻譯

1、附錄1外文文獻原文Straightening Model and Prediction of Straightening Stroke of Precision Linear Guide RailAbstractIn order to improve the straightening precision of flexible automatic straightening machine, a new way of establis

2、hing straightening model and predicting straightening stroke is proposed based on bending experiment. In this paper, aiming at the LG series linear guide rails, the mathematical load-stroke model of press straightening p

3、rocess is established based on elastic-plastic theory. The stroke-deflection model can be obtained by simulating the bending process of guide rails based on loading-unloading FEA analysis. And then the precision straight

4、ening model of predicting straightening stroke, which is describe as a simplicity formula, can be fit out based on establishing compensation knowledge base achieved from bending experiment and experimental data processin

5、g. The experimental results verify this method’s feasibility. It will be helpful to the development of automatic straightening machine’s control system.Keywords: Straightening; Load-stroke model; Linear guide rail2.1 Pre

6、ss Straightening Process of 3-Points Reverse BendingIn the process of press straightening, linear guide rail can be divided into a number of single-arcs to do multi-step straightening. Take single-arc for example, straig

7、htening process is comprised of reverse bending phase and elastic springback phase.Fig.1. shows the load-stroke (F-δ) curve model of straightening process[2]. In this figure, the loading process includes elastic deformat

8、ion stage AB and elastic-plastic deformation stage BC, according to the simple law of unloading , the stage CD is considered elastic springback stage, so the line of AB and CD have the same slope K, point B is the yield

9、point of elastic stage. If we have measured the initial deflection of guide δ0, the location of point D will be defined, and then the location of point C which determines the corresponding straightening stroke δc and str

10、aightening load Fc can be known.2.2 The Mathematical Model of Straightening ProcessWe do analysis of straightening process on the basis of plane assumption and ignoring the impact of Bauschinger effect due to the deforma

11、tion of bending is relatively so small for span. Fig.2 Shows the cross-section diagram of LG series linear guide rail. The material of rails is GCr15 bearing steel, so the stress-strain model was assumed to be an ideal m

12、odel for elastic-plastic materials. As this cross-section is similar to rectangle, we analysis it according to the theory of rectangular section while the actual sectional moment of inertia (I) should be calculated. Acco