问题 问答题 简答题

压铸模由哪几部分组成?其结构单元有哪些部分?其作用是什么?

答案

参考答案:

压铸模由定模和动模两个主要部分组成。压铸模通常包括以下结构单元,

1》成型部分作用是构成成型零件的空腔。

2》模架作用将模具各部分按一定的规律和位置加以组合和固定,并使模具能够安装到压铸机上。

3》导向材料作用是准确地引导动模和定模合拢或分离。

4》顶出机构作用是将铸件从模具中脱出。

5》浇注系统作用是引导金属液按一定的方向进入铸型的成型部分。

6》排溢系统作用是排除压室、浇道和型腔中的气体的通道。

选择题
阅读理解

阅读理解。

     Grandpa Nybakken loved life-especially when he could play a trick on somebody. At those times,

his large Norwegian frame shook with laughter while he pretended innocent surprise, exclaiming, "Oh,

forevermore!" But on a cold Saturday in downtown Chicago, Grandpa felt that God played a trick on

him, and grandpa wasn't laughing.

     Grandpa worked as a carpenter. On this particular day, he was building some boxes for the clothes

his church was sending to an orphanage abroad. On his way home, he reached into his shirt pocket to

find his glasses, but they were gone. He remembered putting them there that morning, so he drove back

to the church.His search proved fruitless.

     Suddenly, he realized what had happened. The glasses had slipped out of his pocket unnoticed and

fallen into one of the boxes, which he had nailed shut. His brand new glasses were heading for China!

The Great Depression was at its height, and Grandpa had six children. He had spent twenty dollars for

those glasses that very morning.

     "It's not fair," he told God as he drove home in frustration. "I've been very faithful in giving of my time

and money to your work, and now this."

     Several months later, the director of the orphanage was on vacation in the United States.He wanted

to visit all the churches that supported him, so he came to speak on Sunday night at my grandfather's

small church in Chicago.Grandpa and his family sat in their usual seats among the small congregation

(教堂会众).

     "But most of all," he said, "I must thank you for the glasses you sent last year."

     "Even if I had the money, there was simply no way of replacing those glasses.Along with not being

able to see well, I experienced headaches every day, so my co-workers and I were much in prayer

about this.Then your boxes arrived.When my staff removed the covers, they found a pair of glasses

lying on the top." After a long pause, he continued, "Folks, when I tried on the glasses, it was as though

they had been custom-made just for me! I want to thank you for being a part of that!"

     The people listened, happy for the amazing glasses.But the director surely must have confused their

church with another, they thought, there were no glasses on their list of items to be sent overseas.

     But sitting quietly in the back, with tears streaming down his face, an ordinary carpenter realized the

Master Carpenter had used him in an extraordinary way.

1. Which of the following is NOT true about Grandpa Nybakken according to the passage?

A. He was an outgoing man and held an active attitude towards life.

B. He had a large family to support.

C. He was a carpenter working in the church.

D. He was a loyal Christian.

2. The people in the church but Grandpa felt confused at what the director said because ________.

A. Grandpa didn't tell the director that he was the owner of the glasses

B. the director wanted to return the glasses even though he liked it

C. the director could not get such glasses in their own country

D. the glasses were not included in the donation list

3. Who does "the Master Carpenter" in the last paragraph probably refer to?

A. Grandpa's master.    

B. One of Grandpa's friends.  

C. God.          

D. Grandpa's co-worker.

4. Which can be the best title of the passage?

A. Grandfather's life                  

B. The Helpful Donation

C. The Perfect Mistake                

D. An Impressive Speech