【正文】 故稱(chēng)其為角鐵式車(chē)床夾具。某些重型、畸形工件，常常將夾具安裝在托板上。 6. 2 車(chē)床夾具的設(shè)計(jì)要點(diǎn) （ 1）定位裝置的設(shè)計(jì)特點(diǎn)和夾緊裝置的設(shè)計(jì)要求 當(dāng)加工回轉(zhuǎn)表面時(shí)，要求工件加工面的軸線與機(jī)床主軸軸線重合，夾具上 15 定位裝置的結(jié)構(gòu)和布置必須保證這一點(diǎn)。因此，夾緊機(jī)構(gòu)必須具有足夠的夾緊力，自鎖性能好，以防止工件在加工過(guò)程中移動(dòng)或發(fā)生事故。 心軸類(lèi)車(chē)床夾具以莫氏錐柄與機(jī)床主軸錐孔配合連接，用螺桿拉緊。 2)對(duì)于徑向尺寸較大的夾具，一般用過(guò)渡盤(pán)與車(chē)床主軸軸頸連接。專(zhuān)用夾具則以其定位止口按 H7/h6 或 H7/js6 裝配在過(guò)渡盤(pán)的凸緣上，用螺釘緊固 。這種安裝方式的 16 定心精度較高，但端面要求緊貼，制造上較困難。過(guò)渡盤(pán)的材料通常為鑄鐵。平衡的方法有兩種：設(shè)置平衡塊或加工減重孔。 17 6. 4 閥體 零件的車(chē)床夾具的加工誤差分析 工件在車(chē)床夾具上加工時(shí)，加工誤差的大小受工件在夾具上的定位誤差 D? 、夾具誤差 J? 、夾具在主軸上的安裝誤差 A? 和加工方法誤差 G? 的影響。 （ 2）夾具誤差 J? 夾具誤差為限位基面與軸線間的距離誤差，即夾具總圖上尺寸 的公差為，以及限位基面相對(duì)安裝基面 C 的平行度誤差是 . （ 3）安裝誤差 A? 因?yàn)閵A具和主軸是莫氏錐度配合，夾具的安裝誤差幾乎可以忽略不計(jì)。 18 第 7 章 閥體零件的鉆床夾具設(shè)計(jì) 鉆床上用來(lái)鉆孔、擴(kuò)孔、鉸孔、锪孔及攻絲的機(jī)床夾具稱(chēng)為鉆床夾具，習(xí)慣稱(chēng)為鉆模。 鉆床夾具的主要類(lèi)型 鉆床夾具簡(jiǎn)稱(chēng)鉆模，主要用于加工孔及螺紋。 （ 2）回轉(zhuǎn)式鉆模 這類(lèi)鉆模上有分度裝置，因此可以在工件上加工出若干個(gè)繞軸線分布的軸向或徑向孔系。 （ 4）蓋板式鉆模 這種鉆模無(wú)夾具體， 其定位元件和夾緊裝置直接裝在鉆模板上。這種鉆 模有結(jié)構(gòu)簡(jiǎn)單、操作方便、動(dòng)作迅速、制造周期短的優(yōu)點(diǎn)浮動(dòng)接頭，生產(chǎn)中應(yīng)用較廣。 4M12 孔中心相對(duì)中心軸線的位置度是 . 20 （ 2）工序基準(zhǔn) 根據(jù)上面的要求，工序基準(zhǔn)是兩中心軸線。 為了方便的裝卸工件，采用鉸鏈?zhǔn)倾@模板。 （ 1）定位誤差 D? 由于兩 中心軸線 既是工序基準(zhǔn)，又是定位基準(zhǔn)，基準(zhǔn)不重合誤差 B? 為零。鉸套導(dǎo)向孔尺寸是 Ф ??、 mm，鉸刀的直徑是 Ф 。 不積跬步何以至千里，本設(shè)計(jì)能夠順利的完成，也歸功于各位任課老師的認(rèn)真負(fù)責(zé)，使我能夠很好的掌握和運(yùn)用專(zhuān)業(yè)知識(shí)，并在設(shè)計(jì)中得以體現(xiàn)。設(shè)計(jì)的順利完成，離不開(kāi)老師的悉心指導(dǎo)和嚴(yán)格要求，謝謝各位老師！ 三年來(lái)，在學(xué)校和各位老師孜孜不倦的教誨和無(wú)微不至的關(guān)懷下，我擁有了更加成熟的思想和更加豁達(dá)的心胸，也學(xué)到了可以獨(dú)立于社會(huì)的一技之長(zhǎng)和永不停息的終身學(xué)習(xí)理念。t charge you more than 35% of your pensation if you win the case. If you are thinking about signing up for a damagesbased agreement, you should make sure you39。s Premier League match at Chelsea on Sunday. I am going to be at the match tomorrow and I have asked to meet Yaya Toure, he told BBC Sport. For me it39。s actions. CSKA said they were surprised and disappointed by Toure39?？傆X(jué)得自己自己似乎應(yīng)該去做點(diǎn)什么，或 者寫(xiě)點(diǎn)什么。t really grow up, it seems is not so important。 Originally, this world, can produce a chemical reaction to an event, in addition to resolutely, have to do, and time. 原來(lái)，這個(gè)世界上，對(duì)某個(gè)事件能產(chǎn)生化學(xué)反應(yīng)的，除了非做不可的堅(jiān)決，還有，時(shí)間。也曾經(jīng)好像已經(jīng)下定了決心去做某件事，但更多的時(shí)候是最后又打起了退堂鼓。 Those were broken into various shapes of stationery。突然想到那件藍(lán)格子襯衫；那些被折成各種各樣形狀的信紙；那段從街角深巷伊始的友誼；還有那場(chǎng)還沒(méi)有開(kāi)始就宣告了終結(jié)的邂逅計(jì)劃 …… 那些年那些天的非做不可，終于和青春一樣，都將在我們的人生中謝幕。t. Baumgartner still will free fall at a speed that would cause you and me to pass out, and no parachute is guaranteed to work higher than 25,000 feet (7,620 meters). cause there 27 。ll be traveling fast, so despite the distance, it will not be like diving into the deep end of a pool. It will be like he is diving into the shallow end. Skydiver preps for the big jump When he jumps, he is expected to reach the speed of sound 690 mph (1,110 kph) in less than 40 seconds. Like hitting the top of the water, he will begin to slow as he approaches the more dense air closer to Earth. But this will not be enough to stop him pletely. If he goes too fast or spins out of control, he has a stabilization parachute that can be deployed to slow him down. His team hopes it39。 Have declared the end of the encounter that haven39。那些曾經(jīng)所謂的非做不可，只是青蔥年華里自己給自己注射的一支強(qiáng)心劑，或者說(shuō)，是自以為是的精神寄托罷了。s time, your ideas are always special to clear. Want, want, line is clear, as if nothing could shake his. Also once seemed to be determined to do something, but more often is he backed out at last. Dislike his cowardice, finally found that there are a lot of love, there are a lot of miss, like shadow really have been doomed. Those who do, just green years oneself give oneself an arm injection, or is a selfrighteous spiritual. 一個(gè)人的時(shí)候，自己的想法總是特別地清晰。t want to give vent to out your inner voice can be in the high school children of the feelings in a period, but was eventually infarction when graduation party in the throat, later again stood on the pitch he has sweat profusely, looked at his thrown a basketball hoops, suddenly found himself has already can39。 The end of our life, and can meet many things really do? 而窮盡我們的一生，又能遇到多少事情是真正地非做不可？ During my childhood, think lucky money and new clothes are necessary for New Year, but as the advance of the age, will be more and more found that those things are optional。 May be back in the past, to oneself the paranoid weird belief disillusionment, these days, my mind has been very messy, in my mind constantly. Always feel oneself should go to do something, or write something. Twenty years of life trajectory deeply shallow, suddenly feel something, do it. 一字開(kāi)頭的年齡已經(jīng)到了尾聲。s 21 win. Michel Platini, president of European football39。s antiracism taskforce, is in London for the Football Association39。t agree with the disciplinary action your employer has taken against you ? your employer dismisses you and you think that you have been dismissed unfairly. For more information about dis