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畢業(yè)設(shè)計(jì)-機(jī)床夾具的設(shè)計(jì)-閱讀頁(yè)

2025-06-26 16:17本頁(yè)面
  

【正文】 件安裝方便,加工質(zhì)量和效率 21 也大為提高。 定位方案選擇 如圖 所示,有三中定位方案可供選擇: 方案 I:工件已 E 面作為主要定位面,用支承板 1 和短銷(xiāo) 2(與工件Ф26H7 孔配 合)限制工件五個(gè)自由度,另設(shè)置一防轉(zhuǎn)擋銷(xiāo)實(shí)現(xiàn)六點(diǎn)定位。 方案 II:工件以Ф 26H7 孔作為主要定位基面,用長(zhǎng)銷(xiāo) 3和支承釘 4限制工件五個(gè)自由度,另設(shè)置一防轉(zhuǎn)擋銷(xiāo)實(shí)現(xiàn)六點(diǎn)定位。 方案 III:工件以Ф 26H7 孔為主要定位基面,用長(zhǎng)銷(xiāo) 3 和長(zhǎng)條支承板 5限制兩個(gè)自由度,限制工件六個(gè)自由度,其中繞 z 軸轉(zhuǎn)動(dòng)的自由度被重復(fù)限制了,另設(shè)置一防擋銷(xiāo)。 圖 銑床定位方案 1支撐板 2短銷(xiāo) 3長(zhǎng)銷(xiāo) 4支撐釘 5長(zhǎng)條支撐板 比較以上三種方案,方案 I 中工件繞 x 軸轉(zhuǎn)動(dòng)的自由度由 E 面限制,定位基準(zhǔn)與設(shè)計(jì)基準(zhǔn)不重合,不利于保證槽的中心平面與Ф 26H7 孔軸線的垂直度。由于輔助支承是在工件夾緊后才起作用,而是施加夾緊力 P 時(shí),支承釘 4 的面積太 22 小,工件極易歪斜變形,夾緊也不可靠。在對(duì)工件施加夾緊力 P時(shí),工件的變形也很小,且定位基準(zhǔn)與設(shè)計(jì)基準(zhǔn)重合。 對(duì)于防轉(zhuǎn)擋銷(xiāo)位置的設(shè)置,也是三種不同的方案。擋銷(xiāo)放在位置 2時(shí),雖然距Ф 26H7 孔軸線較遠(yuǎn),但由于工件定位是毛面,因而定位精度也較 低。因此,防轉(zhuǎn)擋銷(xiāo)應(yīng)放在位置 3較好 。 的定位誤差 采用 ( c)所示定位方案時(shí), E 面既是工序基準(zhǔn),又是定位基準(zhǔn),故基準(zhǔn)不重合誤差為零。因此,加工尺寸12177。 ( 2)槽的中心平面與Ф 26H7 孔軸線垂直度的定位誤差 長(zhǎng)銷(xiāo)與工件的配合去Ф 26H7 g6,則 Ф 26g6=Ф ( mm) Ф 26H7=Ф 25+ 0( mm) 由于定位基準(zhǔn)與設(shè)計(jì)基準(zhǔn)重合,故基準(zhǔn)不重合誤差為零。 夾緊方案 根據(jù)工件夾緊的原則,除施加夾緊力外,還應(yīng)在靠近加工面處增加一 23 夾緊力,用螺母與開(kāi)口墊圈夾壓在工件圓柱的左端面,而對(duì)著支撐板的夾緊機(jī)構(gòu)可采用鉤形壓板,使結(jié)構(gòu)緊湊,操作方便。 夾具體與定位鍵 為保證工件在工作臺(tái)上安裝穩(wěn)定,應(yīng)按照夾具體的高寬比不大于 的原則確定其寬度,并在兩端設(shè)置耳座,以便固定。 夾具總圖上的尺寸、公差和技術(shù)要求 下面以撥叉銑槽夾具為例給予說(shuō)明。 ( 2)影響工件定位精度的尺寸和公差為工件內(nèi)孔與長(zhǎng)銷(xiāo) 10 的配合尺寸為Ф 26H7g6 和擋銷(xiāo)的位置尺寸為 6177。 。 ( 4)影響夾具精度的尺寸個(gè)公差為定位 長(zhǎng)銷(xiāo) 10 的軸心線對(duì)定位鍵側(cè)面 B 的垂直度為 ;定位長(zhǎng)銷(xiāo) 10 的軸心線對(duì)夾具底面 A 的平行度為;對(duì)刀塊的位置尺寸為 9177。 。因此 a=10177。 24 ( 5)影響對(duì)刀精度的尺寸和公差;塞尺的厚度尺寸 2h8=22 。若工序某項(xiàng)精度不能被保證時(shí),還需要夾具的有關(guān)技術(shù)要求作適當(dāng)調(diào)整。 ;對(duì)此項(xiàng)要求有影響的是對(duì)刀塊側(cè)面到定位板 間的尺寸 10177。上述兩項(xiàng)誤差之和△ D+△ G+△ A+△ J+△ T=(vmm) 因此,尺寸 12177。因此有定位誤差,其中△ B=、△ y=(& d+& D) /2=( +) /2=(& d 為銷(xiāo)公差,& D 為工件公差)。 )也對(duì)槽深尺寸有影響,△ T=++,△ J、△ G、△ A 都對(duì)槽深無(wú)影響,因此 △ D+△ G+△ A+△ J+△ T=( mm) 尺寸 8的公差(按 IT14 級(jí))為 ,故尺寸 8mm 能保證; ( 4)槽的中心平面與Ф 26H7 孔軸線垂直度公差 ;影響該項(xiàng)要求的因素有: 1)定位誤差△ D= △ y=; 2)加工方法誤差△ G=; 3)夾具定位心軸 17的軸線與夾具底面 A 的平行度公差 ,即△A= 4)定位心軸 17 的軸線對(duì)定位側(cè)面 B 的垂直度公差 ,即△A=;而△ J△ T都對(duì)垂直度無(wú)影響。此兩項(xiàng)都小于垂直度公差,故該項(xiàng)要求能保證。 小 結(jié) 本文主要設(shè)計(jì) XK100 立式數(shù)控銑床主軸部件 , 對(duì)在本設(shè)計(jì)過(guò)程中的種種因素,方案均作了適當(dāng)?shù)目紤],同時(shí)采取了相應(yīng)的措施 ,XK100 數(shù)控銑床具有很多優(yōu)點(diǎn),解決了很多普通銑床不能加工的零件問(wèn)題,為公司節(jié)省了很多成本,但由于自己所學(xué)知識(shí) 不全面,本文所設(shè)計(jì)的銑床還存在缺點(diǎn),在以后的設(shè)計(jì)中需要改進(jìn),使得產(chǎn)品的性能夠得到進(jìn)一步的提高,主要缺點(diǎn)有以下幾方面: ,轉(zhuǎn)速一高,動(dòng)平衡就不好 ,在以后的設(shè)計(jì)中要注意。 伴隨這篇畢業(yè)論文的收筆,我的畢業(yè)設(shè)計(jì)也近尾聲了。收集材料、確定方案、設(shè)計(jì)、修改、綜合等等,時(shí)間過(guò)得簡(jiǎn)單而緊湊。獨(dú)立地分析和解決工藝問(wèn)題。 ,運(yùn)用夾具設(shè)計(jì)的基本原理和方法,并學(xué)會(huì)擬定夾具的設(shè)計(jì)方案。 。對(duì)于本課題而 26 言,我認(rèn)為自己已經(jīng)基本達(dá)到了設(shè)計(jì)目的,但是也存在著缺陷與不足。 在這二個(gè)月里,我經(jīng)歷了很多,得到了很多,但也失去了很多。我想我得到的并不僅僅是書(shū)本上的知識(shí),更是一個(gè)人工作研究的心境,態(tài)度和經(jīng)驗(yàn)。對(duì)于我來(lái)說(shuō),這些都是無(wú)價(jià)的。 畢業(yè)設(shè)計(jì)的完成,畢業(yè)論文的寫(xiě)作對(duì)于我來(lái)說(shuō)都是第一次,我從其中學(xué)到了很多,這個(gè)過(guò)程就是一個(gè)學(xué)習(xí)的過(guò)程。我將鼓足勇氣,在自己的專(zhuān)業(yè)這條道路上走得更遠(yuǎn)。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 dismissal and unfair dismissal, see Dismissal. You can make a claim to an employment tribunal, even if you haven39。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 antiracism taskforce, is in London for the Football Association39。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 21 win. Michel Platini, president of European football39。s actions. CSKA said they were surprised and disappointed by Toure39。 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。總覺(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。 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。t really grow up, it seems is not so important。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。 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。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。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。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。 Those were broken into various shapes of stationery。 Have declared the end of the encounter that haven39。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。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。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
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