基于ANSYS的液压油缸再制造技术方法可行性分析

Technical feasibility analysis for remanufacturing technology method in hydraulic cylinder based on ANSYS

为了探讨零件在结构上或技术上再制造的可行性，针对采用修理尺寸法在对进行再制造的零件作机械加工中要去除表面层厚度，以消除其表面缺陷及恢复其形状精度时，会在一定程度上削弱零件的强度或刚度的问题，本文选择了工程机械中的动臂油缸和转斗油缸作为研究对象，应用ANSYS有限元分析软件分别对其在缸壁厚度因机械加工减少0．5mm和1．0mm后的力学性能进行分析，通过计算缸体在原设计条件下的应力场和位移场，了解缸体结构加工后的应力应变情况，为采用修理尺寸法进行油缸再制造和确定缸体的再制造修理尺寸及其标准化提供理论依据。计算结果显示，缸体加工后零件最大应力处的安全系数分别为1．63、1．57和1．47、1．41，最小的数值仍然在1．2～1．5的设计安全系数推荐值范围内，表明再制造加工后的油缸缸体能满足强度、刚度要求，采用修理尺寸法进行油缸的再制造是可行的。

A study was conducted for remanufacturing feasibility of used parts at the levels of struc- ture and technology concerning the issue that the repaired part＇s strength and stiffness may somehow decline while the surface thickness of remanufacturing parts is modified during the process of machi- ning to eliminate the surface defects and to restore geometric accuracy by means of size repair meth- ods. A boom cylinder and a rotating bucket cylinder was selected as the objects for study. Their me- chanical properties were analyzed by ANSYS, while their wall thickness was cut by 0.5 mm and 1.0 mm. The stress field and the displacement field of cylinder block were also calculated in origi- nal geometry condition, with an assumption that the stress and strain of cylinder block modified geo- metrical size can provide theoretical basis for defining the scale and standardization of restoring geo- metrical size. The result shows that with an original safety factor of 1.66 for a boom cylinder at max- imum stress, the safety factors are 1.63 and 1.57 when the surface cutting were 0. 5 and 1.0 mm for the repaired cylinder blocks, and the minimum safety factors are still in the range of design limita-tion of 1.2 ~ 1.5. Thus the repaired cylinder block can meet the demands of the strength and rigid- ness, suggesting that size repair method is feasible for the cylinder block remanufaeturing.