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The Preliminary Research of Q235 Sheet Metal Bending Properties That Fiber Orientation Distribution Along the Thickness Direction

Author: LiuHaiMing
Tutor: ZhangRuHua
School: Nanchang University
Course: Materials Processing Engineering
Keywords: Sheet Metal Bending Fiber direction Minimum relative bending radius Experimental study Numerical Simulation
CLC: TG386
Type: Master's thesis
Year: 2009
Downloads: 44
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Abstract

The presence of fibrous tissue, obviously anisotropic mechanical properties of the metal material, the use of the mechanical parts of the performance and processing will have to be reckoned with. Correct understanding and use of the fiber direction of the material is one of the important issues that need to study materials processing engineering. Sheet Metal Bending the most important limitation in the processing conditions - the minimum bending radius (r _min / t) is closely related with the direction of the fibers. The subject on the basis of analytical thinking, the main use of the direct test method, Q235 steel vertical, horizontal, or thick to carry out a bending test, in the authentication of the longitudinal, transverse steel literature data at the same time, the first fiber direction along the thickness the distribution r _min / t data, with information and data to conduct a comparative study and analysis, preliminary quantitative answer three different people rich fibrous tissue process a reference. The main work of the paper and the results obtained: (1) Q235 steel tensile test interception from a diameter of 200mm rolled Q235 steel bars of on chip sample after processing in accordance with the relevant standard tensile test, related data. Thickness to the maximum load elongation delta a _thick 30.9% the lateral extension the rate delta _cross 28.9%. The estimation formula the (r _min / t) the _thick 1.16, the (r _min / t) _cross was 1.43. (2) Q235 steel bending test design and manufacture of a combined bending test mold, reference standard, direct Built Q235 steel bending test, the measured r _min / t respectively. : bending angle of 90 °, the bend line and perpendicular to the direction of the fibers is 0.50 to 0.60, bend line parallel to the fiber direction acts 1.00 ~ 1.20, the thick curved 0.60 ~ 0.67; bending angle of 120 °, the bend line and perpendicular to the fiber direction. 0.70 ~ 0.80, the bend line parallel to the fiber direction acts, from 1.20 to 1.25 and a thickness of bending is 1.00 to 1.02. The thickness of the bending R the _min / t Data close to the bend line perpendicular to the fiber direction, representing a curved line with the fiber direction parallel to deviate significantly. (3) Numerical experiments based on Pro / E, DEFORM software, the bending deformation process numerical experiments. Bending force analysis provides a basis for theoretical research and supplement. Subject through a large number of direct experiment, and apply the preferred method to improve efficiency. 6 times the average tensile data with experiment data as results of tension tests as a bending test results using 0.618 draw a a reliable minimum bend radius results in the approximation results. This study provides data to enrich the content of sheet metal bending performance, and provide reference for sheet metal machining practices.

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