高精度数控液压折弯机应力测试与变形分析

Stress measurement and deformation analysis of high-precision CNC hydraulic bending machine

运用应变测试法对某型号数控液压折弯机机身在满载压底折弯工况下的静态应力和变形进行测试。应力测试结果表明,机床侧板喉口区域应力超过200 MPa,最大应力达227.9 MPa,滑块两侧油缸区域应力达300 MPa以上,滑块底面和工作台顶面测点整体应力较小,但在长度方向存在应力不均匀性。变形测试结果表明,滑块变形形状整体趋于水平,工作台变形下凹,滑块最大变形达到1.92 mm,工作台达到1.65 mm,整体刚性较差;工作台液压补偿时,工作台和滑块变形均大幅减小,变形明显改善,折弯精度显著提高。应力和变形试验分析为后续该机型的有限元分析和结构优化设计提供了可靠的参考依据。

The static stress and deformation of the body of a numerical control hydraulic bending machine under full load bottom bending were tested by modern strain test method.The stress of the throat area of the side panels exceeded 200 MPa with the maximum stress 227.9 MPa,and the stress in the cylinder area on both sides of the slide block is more than 300 MPa.The stress on the bottom of the slide block and the top of the worktable was small,but the stress in the length direction was not uniform.The deformation test results showed that the deformation shape of the slide block tended to level,the deformation of the worktable was concave,the maximum deformation of the slide block reached 1.92 mm,that of the worktable reache 1.65 mm,the whole rigidity was poor;when the worktable was compensated by hydraulic pressure,the deformation of worktable and slide block was greatly reduced,the deformation was obviously improved,and the bending precision was obviously improved.The stress and deformation test analysis provides a reliable reference for the subsequent finite element analysis and structural optimization design of the machine.