【正文】 件在加工中的定位、夾緊以及工藝尺寸確定等問(wèn)題，保證零件的加工質(zhì)量，初步具備設(shè)計(jì)一個(gè)中等復(fù)雜程度零件的工藝規(guī)程的能力。通過(guò)設(shè)計(jì)能獲得綜合運(yùn)用過(guò)去所學(xué)過(guò)的全部課程進(jìn)行機(jī)械制造工藝及結(jié)構(gòu)設(shè)計(jì)的基本能力，為以后走上工作崗位進(jìn)行一次綜合性的訓(xùn)練和準(zhǔn)備。 （ 2）能提高勞動(dòng)生產(chǎn)率 使用夾具裝夾工件方便、快速，工件不需要?jiǎng)澗€找正，可顯著地減少輔助工時(shí)，提高勞動(dòng)生產(chǎn)率；工件在夾具中裝夾后提高了工件的剛性，因此可加大切削用量，提高勞動(dòng)生產(chǎn)率；可使用多件、多工位裝夾工件的夾具，并可采用高效夾緊機(jī)構(gòu)，進(jìn)一步提高勞動(dòng)生產(chǎn)率。為此，在進(jìn)行機(jī) 械加工前，先要將工件裝夾好。 position tolerance parts 目 錄 摘 要 ................................................................................................................................... … Ⅰ ABSTRACT............................................................................................................................. Ⅱ 第一章 緒論 ............................................................................................................................ 1 課題研究的目的及內(nèi)容 ................................................................................................... 1 第二章 零件的工藝分析 ........................................................................................................ 2 零件的作用 ..................................................................................................................... 2 零件生產(chǎn)類(lèi)型的確定 ....................................................................................................... 3 第三章 零件的 工藝規(guī)程設(shè)計(jì) ................................................................................................ 4 確定毛坯的制造形式 ....................................................................................................... 4 確定機(jī)械加工余量及毛坯尺寸 ......................................................................................... 4 定位基準(zhǔn)的選擇 .............................................................................................................. 6 零件表面加工方法的選擇 ................................................................................................ 7 制訂工藝路線 ................................................................................................................. 9 工序設(shè)計(jì) ...................................................................................................................... 12 確定切削用量及基本工時(shí) .............................................................................................. 14 第四章 專(zhuān)用夾具設(shè)計(jì) .......................................................................................................... 23 問(wèn)題的提出 ................................................................................................................... 23 定 位方案及定位元件的選擇 .......................................................................................... 23 夾緊方案及夾緊元件的選擇 .......................................................................................... 25 夾具體的選擇 ............................................................................................................... 27 自鎖條件的計(jì)算 ............................................................................................................ 27 夾緊力的計(jì)算 ............................................................................................................... 27 定位誤差 D? 的計(jì)算 ...................................................................................................... 29 夾具的使用 .................................................................................................................... 30 第五章 結(jié)論 .......................................................................................................................... 31 參考文獻(xiàn) .................................................................................................................................. 32 致 謝 ........................................................................................................................................ 33 四川理工學(xué)院 畢業(yè)設(shè)計(jì)（論文） 1 第一章 緒論 夾具是機(jī)械制造廠里使用的一種工藝裝備，分為機(jī)床夾具、焊接夾具、裝配夾具及檢驗(yàn)夾具等。 fixture。 關(guān)鍵詞： 工藝；夾具；定位；位置公差 Ⅱ ABSTRACT The preparation of parts of the process is reasonable, directly related to the machining quality requirements can be met。為了降低成本、減少裝夾時(shí)間，采用凸輪聯(lián)動(dòng)夾緊裝置。在編制加工工藝時(shí)，要考慮 到孔的各項(xiàng)精度以及形狀與位置公差等?？梢?jiàn)這兩者在機(jī)械制造行業(yè)中是至關(guān)重要的環(huán)節(jié)。 Ⅰ 摘 要 零件的工藝編制是否合理，直接關(guān)系到零件的加工能否達(dá)到質(zhì)量要求；合理的工藝編制就能使各工序科學(xué)地銜接，實(shí)現(xiàn)優(yōu)質(zhì)、高產(chǎn)低消耗，使生產(chǎn)均衡、順利地進(jìn)行。同時(shí)，機(jī)床夾具在機(jī)械制造中也占有重要的地位，合理的夾具設(shè)計(jì)能可靠地保證工件的加工質(zhì)量，提高加工效率，減輕勞動(dòng)強(qiáng)度，充分發(fā)揮和擴(kuò)大機(jī)床的工藝性能。本次設(shè)計(jì)的是減速箱箱體上 ? 100 孔的加工工藝及夾具設(shè)計(jì)，該孔精度要求較高，采有用鏜床加工。 在設(shè)計(jì)加工 ?100 孔的專(zhuān)用夾具時(shí)，以箱座底面為基準(zhǔn)，采用一面兩銷(xiāo)定位，通過(guò)連接螺栓將箱蓋和箱座聯(lián)結(jié)，并以定位銷(xiāo)將其定位。逆時(shí)針轉(zhuǎn)動(dòng)手柄時(shí)，在拉伸彈簧的作用下，壓板松開(kāi)，放入工件，順時(shí)針轉(zhuǎn)動(dòng)手柄帶動(dòng)凸輪推動(dòng)推桿，從而壓緊工件。 reasonable preparation process will enable the convergence of scientific processes to achieve highquality, highyield low, so that the production of a balanced, smoothly. At the same time, in the machinery manufacturing fixture also occupy an important position, reasonable and reliable fixture design can guarantee the quality of the workpiece processing, improve processing efficiency, reduce labor intensity and give full play to the technology and the expansion of machine tool performance. Can be seen both in the machinery manufacturing industry is vital link. The design of the deceleration box box holes 100 and fixture design process, the holes require a higher precision, boring process mining useful. In the preparation process, it is necessary to take into account the pore shape and location accuracy, as well as tolerance and so on. Hole in the design of special processing fixture 100 when the seat bottom to me based on the use of a twopin position, through the bolt cover and the box seat to join, and its positioning pins. In order to reduce costs, reduce the clamping time, linked the use of cam clamps. Handle counterclockwise rotation, in the role of the tensile spring, the platen release into the workpiece, the processing has been pleted, turning the handle clockwise to promote putt cam driven, thus pacting the workpiece. Keywords: Technology。 positioning。對(duì)工件進(jìn)行機(jī)械加工時(shí)，為了保證加工要求，首先要使工件相對(duì)于刀具及機(jī)床有正確的位置，并使這個(gè)位置在加工過(guò)程中不因外力的影響而變動(dòng)。用夾具裝夾工件有下列優(yōu)點(diǎn)： （ 1）能穩(wěn)定地保證工件的加工精度 用夾具裝夾工件時(shí)，工件相對(duì)于刀具及機(jī)床的位置精度由夾具保證，不受工