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IMV转向节属于“孔-盘-叉-臂”结构,共有5个长度不一的分叉和1个长臂,在实际生产中长叉末端易出现塌角,且材料利用率较低,针对该问题进行了IMV转向节的阻力墙模具结构优化设计。建立了正交试验方案,并以降低成形载荷、模具磨损和提高填充能力为目标,得到了较优的阻力墙结构参数,即两墙面拐角圆角r为25 mm,阻力墙高度h为20 mm,阻力墙斜度a为10°,阻力墙间隙n为3 mm。把阻力墙引入复杂转向节预锻成形中,并对4个主要参数进行优化。采用优化正交试验方案r3h1a2n2进行生产试验验证,试验结果表明,原材料直径由Ф100 mm降为Ф95 mm,使材料利用率提高了3.2%。
IMV steering knuckle belongs to the “hole-plate-fork-arm” structure. There are 5 bifurcations and 1 long arm with different length. In practice, the end of the long fork is prone to collapse, and the material utilization rate is low To solve this problem, the design of the resistance wall mold structure of IMV steering knuckle was optimized. An orthogonal experiment scheme was set up and aiming at reducing forming load, die wear and filling capacity, the optimal structural parameters of the resistance wall were obtained, ie the corner r of the two walls was 25 mm and the height h of the resistance wall was 20 mm, resistance wall slope a is 10 °, and resistance wall gap n is 3 mm. The resistance wall is introduced into the complex steering knuckle preforming, and the four main parameters are optimized. The optimized orthogonal test scheme r3h1a2n2 was used to verify the production test. The test results showed that the raw material diameter was reduced from Ф100 mm to Ф95 mm, which improved the material utilization rate by 3.2%.