冷整形对大模数直齿轮精度的影响

来源期刊:中南大学学报(自然科学版)2017年第2期

论文作者:周杰 梁强 朱姗姗 曹金豆

文章页码:310 - 316

关键词:大模数直齿轮;冷整形;齿轮精度;数值模拟

Key words:spur gear with big modulus; cold precision sizing; gear accuracy; numerical simulation

摘    要:为提高大模数圆柱直齿轮冷整形后的精度,以实测齿轮预锻件形状尺寸为基础,建立基于误差模型的直齿轮冷整形过程的弹塑性有限元仿真模型,通过数值模拟得到精整量δ和精整凹模定径带长度L对齿轮齿廓总偏差和螺旋线总偏差的影响规律。对直齿轮冷整形工艺进行实际验证,并对整形后齿轮的检测数据进行方差分析。研究结果表明:精整量对齿轮精度影响显著;当精整量为0.15~0.20 mm时,通过冷整形可以获得齿形精度为8级、齿向精度为7~8级的齿轮;工艺实验得到的齿轮偏差与模拟结果变化趋势一致。

Abstract: In order to improve gear accuracy in cold precision after cold precision sizing, an elastic plastic FE model based on the measured gear shape of pre-forging was built to simulate the cold precision sizing process. The laws of sizing amount and die bearing length on the tooth profile total deviation and the tooth orientation total deviation were obtained by numerical simulation. The experiment of the spur gear cold precision sizing process was made and data were analyzed by analysis of variance (ANOVA). The results show that the sizing amount has significant effects on gear accuracy. When the sizing amount is 0.15-0.20 mm, the gear of the tooth profile accuracy with 8 magnitudes and the gear direction precision with 7-8 magnitudes are obtained through the cold precision sizing. The change tendency of the deviation of gear obtained by experiment is similar to the FEM result.

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