【正文】 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 jumpWhen 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心劑，或者說，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.　　一個人的時候，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.　　一字開頭的年齡已經(jīng)到了尾聲。s 21 win.Michel Platini, president of European football39。s about how he felt and I would like to speak to him first to find out what his experience was.Uefa hasEmployment tribunals.The (lack of) air up there Watch mCayman Islandsbased Webb, the head of Fifa39。a damagesbased agreement, you should make sure you39。Further help.If you are being represented by a solicitor at the tribunal, they may ask you to sign an agreement where you pay their fee out of your pensation if you win the case. This is known as at you don39。感謝他們?nèi)陙淼男燎谠耘唷Ｔ诖讼蜿惱蠋煴硎旧钌畹母兄x和崇高的敬意。（2）對刀誤差不考慮鉆頭的偏斜。3. 工件的加工精度分析工件在鉆床夾具上加工時，加工誤差的大小受工件在夾具上的定位誤差、對刀誤差、夾具誤差、夾具在主軸上的安裝誤差和加工方法誤差的影響。（2）導(dǎo)向方案由于加工四個螺紋孔，要先鉆孔，然后攻絲，又是批量生產(chǎn)，故適宜選用可換式鉆套。（1）固定鉆套（2）可換鉆套（3）快換鉆套（4）特殊鉆套2．鉆模板鉆模板用于安裝鉆套， 確保鉆套在鉆模上的正確位置，鉆模板多裝在夾具體或支架上， 常見的鉆模板有：（1）固定式鉆模板（2）鉸鏈?zhǔn)姐@模板（3）可卸（分離）式鉆模板 （4）懸掛式鉆模板 閥體零件的鉆床專用夾具的總體設(shè)計1．工藝分析（1）工件的加工要求4M12孔軸線與中心軸線的夾角是45度。 （5）滑柱式鉆模 滑柱式鉆模是帶有升降鉆模板的通用可調(diào)夾具。其結(jié)構(gòu)較簡單，加工鉆模一般手工進行翻轉(zhuǎn)，所以夾具及工件應(yīng)小于10kg為宜。（1）固定式鉆模 在使用中，這類鉆模在機床上的位置固定不動浮動接頭，而且加工精度較高，主要用于立式鉆床上加工直徑較大的單孔或搖臂鉆床加工平行孔系。使用鉆?？梢蕴岣呖准翱紫甸g的位置精度，又有利于提高孔的形狀和尺寸精度，同時還可節(jié)省劃線找正的輔助時間，其結(jié)構(gòu)簡單、制造方便，因此鉆模在批量生產(chǎn)中得到廣泛的應(yīng)用。一般取=/3=閥體零件的車床夾具總加工誤差是： 精度儲備：故此方案可行。因此，尺寸的定位誤差等于零。因此，還應(yīng)該注意防止切削和冷卻液的飛濺問題，必要時應(yīng)該加防護罩。因此，對于重量不對稱的夾具，要有平衡要求。圖1 車床夾具與機床主軸的連接過渡盤常作為車床附件備用，設(shè)計夾具時應(yīng)按過渡盤凸緣確定專用夾具體的止口尺寸。對于車床主軸前端為圓錐體并有凸緣的結(jié)構(gòu)，如圖1c所示，過渡盤在其長錐面上配合定心，用活套在主軸上的螺母鎖緊，由鍵傳遞扭矩。為防止停車和倒車時因慣性作用使兩者松開，可用壓板將過渡盤壓在主軸上。這種連接方式定心精度較高。因此，要求夾具的回轉(zhuǎn)軸線與臥式車床主軸軸線應(yīng)具有盡可能小的同軸度誤差。由于加工時工件和夾具一起隨主軸高速回轉(zhuǎn)，故在加工過程中工件除受切削力矩的作用外，整個夾具還要受到重力和離心力的作用，轉(zhuǎn)速越高離心力越大，這些力不僅降低夾緊力，同時會使主軸振動。而生產(chǎn)中需自行設(shè)計的較多是安裝在車床主軸上的專用夾具，所以閥體零件在車床上加工用專用夾具。（2） 安裝在托板上的夾具。角鐵式車床夾具 在車床上加工殼體、支座、杠桿、接頭等零件的回轉(zhuǎn)端面時，由于零件形狀較復(fù)雜，難以裝夾在通用卡盤上，因而須設(shè)計專用夾具。因而車床夾具的主要特點是工件加工表面的中心線與機床主軸的回轉(zhuǎn)軸線同軸。 安排加工工藝路線在擬定工藝路線時，工序集中或分散的程度，主要取決于生產(chǎn)規(guī)模、零件的結(jié)構(gòu)特點和技術(shù)要求，有時，還要考慮各工序生產(chǎn)節(jié)拍的一致性。就閥體零件來說：（1）該工件是以左端面和軸線為基準(zhǔn)，根據(jù)基面先行的原則，第一道工序應(yīng)以右端面外圓定位加工左端面及內(nèi)孔。四個螺紋孔對Φ35的軸線的位置度也應(yīng)達(dá)到設(shè)計要求。 技術(shù)要求分析尺寸精度：閥體的尺寸精度中Φ50，Φ35的精度為IT7。以閥體前后對稱面為寬度方向尺寸基準(zhǔn)，注出閥體的圓柱體外形尺寸φ5左端面方形凸緣外形尺寸7575，以及四個螺孔的定位尺寸φ70。以閥體水平軸線為徑向（高度方向）尺寸基準(zhǔn)，注出水平方向的徑向直徑尺寸φ50、 φ3φ20和M362等。第四，缺口敏感性低。閥體的材料是灰鑄鐵HT350，其抗拉強度大于350MPa。e. 鎖緊機構(gòu) 鎖緊機構(gòu)是分度對定后將轉(zhuǎn)動部分和固定部分緊固在一起，減小加工時的