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针对某档位齿轮坯在闭式精锻成形过程中径向筋部出现的充填不饱满和折叠的缺陷,为了优化金属的流动性,改善筋部的填充情况,获得性能优良的合格锻件,运用正交实验和有限元结合的方法,分析了模具筋部拔模斜度α、圆角半径R对成形过程的影响,得出了极限模具结构参数图。分析了不同区域模具结构参数对成形质量的影响,确定在区域D中的参数条件下,锻件无明显的充不满和折叠缺陷,并优选拔模斜度为1.3°、圆角半径为3 mm进行了实际生产验证。研究结果表明:锻件质量良好,筋部端面平整,底部无折叠缺陷,实际锻件与数值模拟结果相吻合。
In order to optimize the fluidity of the metal, improve the filling of the tendons and obtain the qualified forgings with good performance, aiming at the defects of filling and folding of the radial ribs appearing in the closed precision forging process, Orthogonal experiment and the combination of finite element method, the impact of the mold draft taper α, fillet radius R on the forming process was analyzed, and the ultimate mold structure parameter diagram was obtained. The influence of structural parameters of different molds on the forming quality was analyzed. It was confirmed that there was no obvious dissatisfaction and folding defects in the forging under the condition of the parameters in the area D, and the drawing draft was 1.3 ° and the fillet radius was 3 mm The actual production verification. The results show that the quality of forgings is good, the ends of tendons are smooth and the bottom has no folding defects. The actual forgings are consistent with the numerical simulation results.