是比较滚齿和插齿在加工质量和生产率方面各有何特点？_爱下问搜题

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问题问答题简答题

是比较滚齿和插齿在加工质量和生产率方面各有何特点？

答案

参考答案：1、在加工方面：从影响传递运动的准确性方面分析，滚齿后齿轮的齿距累积误差和公法线长度变动误差比插齿小。从影响传动平稳性方面分析，插齿后的齿形误差比滚齿小。滚齿后的齿面粗糙度值比插齿大。滚齿一般可以保证7~9精度的齿轮，齿面粗糙度达Ra2.5~10um：插齿可以保证6~9级精度的齿轮，齿面粗糙度达Ra0.5~1.25um但运动精度较低。

2、在生产率方面：插齿适合于切削小模数薄齿轮的加工。滚齿适合于切削中等及中等以上模数齿轮和多个叠加薄齿轮的加工生产。

选择题

新型师生关系建立在基础上

A.民主平等 B.人格平等 C.互相尊重

完形填空

I was in the kitchen making lunch when I saw my six-year-old son, Billy, walking toward the woods. I could only see his back. He 56  to be walking with a great effort, trying to be as 57 as possible.
A few minutes after he disappeared into the   58 , he came running toward the house again. I went back to making sandwiches,   59  that whatever task he had been doing was completed. Moments later, 60 , he was once again walking slowly toward the woods.
61 curiosity, I walked out and followed him on his journey. He was 62  both hands in front of him as he walked, being 63  not to spill the water he held in them. I secretly walked   64  behind him as he went into the woods and I saw the most amazing 65 .
Several large deer loomed in front of him. Billy walked right up to them. I almost 66   at him to get away. A huge male deer with elaborate（精美的）antlers was   67  close. But they didn’t even move as Billy   68 . And I saw a small deer lying on the ground, obviously suffering from   69 and extreme heat, lift its head 70  to drink the water cupped in my beautiful boy’s hands.
It was on this day that I learned the true lesson of 71 . You know, we hadn’t had any rain for three months and our crops were   72 . As the tears that rolled down my face began to hit the ground, they were suddenly   73  by other drops. I looked up at the sky. It was 74  God was moved to weep. The rain came that day and saved our farm, just like the 75 of one little boy who saved another.

D．In spite of

C．surrounding

B．dangerously

D．settled down

C．with appreciation

D．with difficulty

D．expectation