基于环向应变的多道次无芯模旋压变进给比成形方法

发布时间：2018-07-10 05:33

本文选题：环向应变 + 无芯模旋压　；参考：《浙江大学学报(工学版)》2017年09期

【摘要】：为提高无芯模旋压成形质量,引入变速成形技术,提出变进给比旋压成形方法.该方法的关键为获取与旋轮轨迹相适应的进给比设计方案,使成形时间与成形量相匹配,从而保证坯料充分成形.针对道次进给比设计,根据各道次平均环向应变量进行成形时间道次间分配,提出有利于提高形状精度的"匀速变形原则"和"终道次充分成形原则".针对道次内进给比设计,根据终道次局部环向应变分布情况进行成形时间道次内优化分配,并提出有利于抑制形状误差的"大环向应变充分成形原则".实验结果显示,在总成形时间不变的条件下,采用变进给比方法进行无芯模旋压成形可以将平均形状误差降低约47%,同时更好地保持坯料壁厚,防止坯料过度减薄.
[Abstract]:In order to improve the quality of non core mould spinning forming, a variable feed ratio spinning forming method is put forward by introducing variable speed forming technology. The key of this method is to obtain a feed ratio design scheme adapted to the track of the rotary wheel, to match the forming time with the forming quantity, so as to guarantee the full forming of the blank. In order to improve the shape accuracy, the "uniform deformation principle" and "the final shape full forming principle" are put forward to improve the shape precision. According to the design of the inner feed ratio in the channel, the optimum distribution of the forming time in the forming time is carried out according to the distribution of the local circumferential strain of the final channel, and the "large ring direction" is put forward to restrain the shape error. The experimental results show that, under the condition of constant forming time, the mean shape error can be reduced by about 47% by using the variable feed ratio method to reduce the average shape error, while the thickness of the blank is kept better and the blank thinning is prevented.
【作者单位】：浙江大学流体动力与机电系统国家重点实验室;
【基金】：浙江省自然科学基金资助项目(LY15E050003) 国家自然科学基金资助项目(51675470) 中央高校基本科研业务费专项资金资助(2015QNA4003)
【分类号】：TG306

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