機械制造畢業(yè)論文-制定ca6140車床撥叉的加工工藝，設(shè)計鉆φ25孔的鉆床夾具(參考版)
2025-06-07 17:54本頁面
【正文】 m fortunate to have been given many opportunities throughout my career and now I feel it39。m starting a new adventure and I39。m grateful for my parents39。m fortunate to have realised those this day, one of my proudest achievements is captaining my country. I knew every time I wore the Three Lions shirt, I was not only following in a long line of great players, I was also representing every fan that cared passionately about their country. I am honoured to represent England both on and off the wouldn39。 ” I39。s OK. He and we have just adapted.39。It would be the best if he had four legs, of course, but his body wasn39。主人們用 “騎兵 ”一詞來形容 Duncan，他們在組織的 Facebook 中寫道： “他很快樂，也很健康；而且在他自己看來，他是條正常的狗。He39。, adding on charity39。s owners have described him as a 39。 The thrill of running through the surf was clear to see, as Duncan raced people and dogs across the sand, with his tail wagging excitedly. Duncan踏著浪花，在沙灘上同其他人及狗賽跑，還興奮地搖著尾巴，他的喜悅之情顯而易見。視頻中有些特意制作的慢鏡頭，但是沒有任何一處做過加速處理，你們可以通過視頻感受到 Duncan 跑得有多快。We let him be free and just walk on his two legs. There is some slow motion in this video, but none of the video has been sped up, this gives you an idea of how fast Duncan really it,39。t like to use it.主人們將視頻傳到了 YouTube 上，他們說有一把供 Duncan 使用的輪椅，但是他并不愛用。 He was born with deformed back legs, which were later removed to make the dog more fortable. Duncan 出生時，它的后肢就是畸形的，此后為了讓他舒服些 ,只能進行截肢。 His exciting day trip was filmed by Panda Paws Rescue, a Washington statebased charity that cares for Duncan and other dogs with special Panda Paws Rescue 拍攝，該組織專門照料 Duncan 以及其他有特殊需求的狗。切削用量手冊 北京：機械工業(yè)出版社 [4] 金屬切削手冊 上海：上海科學(xué)文化技術(shù)出版社 A boxer that only has front legs refuses to let his disability hold him back as he charges across a beach with his fourlegged ，他同其他四條腿的伙伴們一同在海灘上盡情狂奔。北京：機械工業(yè)出版社 [2]東北重型機械學(xué)院，洛陽農(nóng)業(yè)機械學(xué)院編。 本夾具的最大優(yōu)點就是結(jié)構(gòu)緊湊 ,承受較大的夾緊力。本道工序為鉆床夾具選擇了壓板和壓緊螺釘夾緊方式。應(yīng)使夾具結(jié)構(gòu)簡單，便于操作，降低成本。但是，由于加工是自由公差，故應(yīng)當(dāng)能滿足定位要求。 (1) 夾具的主要定位元件為一平面和一 v 形塊和一矩形塊，面與面配合。 壓板用螺母擰緊，由《機床夾具設(shè)計手冊》表 1223得螺母擰緊力 NN 4200＝擰 根據(jù)杠桿原理壓板實際加緊力為 NN 1260034200 ＝＝壓 ? 此時 壓N 已大于所需的 1460N 的夾緊力，故本夾具可安全工作。 1l —— 絲錐切削錐長度； 三、夾具設(shè)計 （一） 定位基準(zhǔn)的選擇 由零件圖可知，用 60? 圓弧一端面定位并用壓板夾緊，再用兩可調(diào)螺釘組成的 v 形上定 位限制五個自由度。 Z535 允許最大為 15690N。 進給量 rmmf /? 由此可以看出受限制的進給量是工藝要求，從中取 rmmf /? 由表 16 可 以 查 出 鉆 孔 時 的 軸 向 力 在 rmmf /? mmd ? 時為： NFt 12360? 軸向力修正系數(shù)為 故 NNFc 1 5 6 9 01 2 3 6 0 ?? 故 rmmf /? 可用 2）確定鉆頭磨鈍標(biāo)準(zhǔn)及耐用度， 由表 9 mmd ? 時 鉆頭后刀面最大磨損量取為 耐用度 sT 4500? 3） 確定切削速度 由表 10 加工性為第三類 rmmf /? 雙橫刃磨的鉆頭 mmd ? 時 smvt /? 切 削 修 正 系 數(shù) ?tvk ?cvk ?lvk ?tvk 故 smkvv vt / ??????? srd vn / 0 ????? ? 8 4） 加工工時 nfLtm? 其中 ???? ylL mml 80? 由表 22 mmy 10??? 所以 stm 1080 ???? 擴孔： ?? rmmf /? sT 2400?
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