以下为句子列表：
英文: Adopting the precision cold forging to carrying out the tooth profile modification of spur bevel gear evidently lowered the cost, thus provided a kind of new researching method for the modification, vibration reduction, noise dropping and design of the ge
中文: 直齿锥齿轮采用冷精锻进行齿廓修形，显著地降低了成本，这为齿轮传动系统的修形、减振、降噪和设计提供了一种新的研究方法。
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英文: On the basis of relationship between meshing rigidity and noise and taking the modification, vibration deduction and noise dropping as the aims, the tooth profile modification was carried out on spur bevel gar by the use of revolving involute curve.
中文: 摘要根据啮合刚度和噪声之间的关系，以修形减振降噪为目的，用旋转渐开线曲线对直齿锥齿轮进行齿廓修形。
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