问题 问答题 论述题

冷作装配的特点?

答案

参考答案:

①冷作件因其零件精度不高,互换性差,装配时常需修配或调整。

②冷作件的连接大多数采用焊接等不可拆连接,返修困难,易导致零部件的报废,所以对冷作件的装配程序应有严格的要求。

③装配过程中,常伴有大量的焊接工作,应掌握焊接的应力和变形规律。

④冷作件一般体积较大,局部剐性较差,易变形。装配时应考虑加固措施。

⑤对某些特别庞大的冷作件,为考虑运输、吊装的方便,常需要分组出厂至工地进行总装,必要时可将不可拆连接改为临时的可拆连接。

⑥冷作产品的生产,可根据其生产数量的多少,对一些结构相似的产品及一些批量生产的零部件,可装备适当的专用或通用工夹具。

阅读理解

 A friend of mine named Paul received an expensive car from his brother as a Christmas present.On Christmas Eve when Paul came out of his office,a street urchin(顽童) was walking around the shining car.“Is this your car,Paul?”he asked. 

Paul answered,“Yes,my brother gave it to me for Christmas.” The boy was surprised.“You mean your brother gave it to you and it didn't cost you nothing?Boy,I wish…” He hesitated(犹豫). 

Of course Paul knew what he was going to wish for.He was going to wish he had a brother like that. But what the boy said surprised Paul greatly. 

“I wish,” the boy went on,“that I could be a brother like that.” Paul looked at the boy in surprise, then he said again, “Would you like to take a ride in my car?” 

“Oh yes,I'd love that.” 

After a short ride,the boy turned and with his eyes shining,said,“Paul,would you mind driving in front of my house?” 

Paul smiled a little.He thought he knew what the boy wanted.He wanted to show his neighbours that he could ride home in a big car. But Paul was wrong again. “Will you stop where those two steps are?” the boy asked. 

He ran up to the steps. Then in a short while Paul heard him coming back, but he was not coming fast. He was carrying his little crippled(残疾) brother. He sat him down on the step and pointed to the car. 

“There she is, Buddy, just like I told you upstairs. His brother gave it to him for Christmas and it didn't cost him a cent. And some day I'm going to give you one just like it…then you can see for yourself all the nice things in the Christmas windows that I've been trying to tell you about.” 

Paul got out and lifted the boy to the front seat of his car. The shining-eyed older brother climbed in beside him and the three of them began an unforgettable holiday ride. 

小题1:The street urchin was very surprised when ________. 

A.Paul received an expensive car

B.Paul told him about the car

C.he saw the shining car

D.he was walking around the car小题2:From the story we can see the urchin ________. 

A.wished to give his brother a car

B.wanted Paul’s brother to give him a car

C.wished he could have a brother like Paul's

D.wished Paul could be a brother like that小题3:The urchin asked Paul to stop his car in front of his house ________. 

A.to show his neighbours the big car

B.to show he had a rich friend

C.to let his brother ride in the car

D.to tell his brother about his wish小题4:We can infer(推断)from the story that ________. 

A.Paul couldn't understand the urchin

B.the urchin had a deep love for his brother

C.the urchin wished to have a rich brother

D.the urchin's wish came true in the end小题5:The best name of the name story is _________.

A.A Christmas Present

B.A Street Urchin

C.A Brother Like That

D.An Unforgettable Holiday Ride

多选题