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具就可以了,所以采用游標(biāo)卡尺進(jìn)行測(cè)量,以保證加工質(zhì)量。s Day. More and more young Chinese people begin to celebrate this day in a very similar way as that in western countries. Fewer people than ever will gaze at the heavens on Saturday to pick out the two stars shining bright on either side of the Milky Way, that is, if people even know on which day Qixi falls. There are ready reminders dotted about, in the form of big ads saying Sales on Chinese Valentine39。 內(nèi)型腔粗加工時(shí)為 800,精加工時(shí)為 1000。 刀具的選擇 根據(jù)零件的形狀 結(jié)構(gòu),選擇刀具如下: 凸臺(tái)的輪廓粗加工用直徑為 30 mm 的銑刀 ,精加工選擇直徑為 20 mm 的銑刀,內(nèi)型腔粗加工選擇直徑為 10 mm 的銑刀,精加工選擇直徑為 5 mm 的銑刀。三爪卡盤安裝工件 三爪卡盤是車床上應(yīng)用最廣的通用夾具,適合于安裝短圓棒料或盤類(直徑較大的盤狀工件中,可用反三爪夾持)工件 。鉸孔是應(yīng)用較普遍的孔的精加工方法之一,其加工精度可達(dá) IT6~ IT7 級(jí),表面粗糙度Ra=~ 。 關(guān)鍵詞 : 復(fù)雜零件加工 工藝設(shè)計(jì) 程序編制 1 1 設(shè)計(jì)要求 設(shè)計(jì)計(jì)算說明書部分 加工路線方案的擬訂與選擇 加工工序的安排與說明 毛坯、工藝參數(shù)、刀夾具與機(jī)床的選擇與說明 加工表面的程序清單 其他 設(shè)計(jì)繪圖部分 數(shù)控加工工序卡片 數(shù)控加工走刀路線圖 圖名 圖幅 張數(shù) 折合零號(hào)圖數(shù) 數(shù)控加工工序卡片 A3 2 數(shù)控加工走刀路線圖 A3 2 合計(jì) 4 2 零件的分析與毛坯的選擇 生產(chǎn)類型的確定 確定生產(chǎn)類型的依據(jù) 生產(chǎn)綱領(lǐng) 生 產(chǎn)綱領(lǐng) N=Q n (1+α %+β %) 式中 N零件的生產(chǎn)綱領(lǐng) Q產(chǎn)品的年產(chǎn)量 n每臺(tái)產(chǎn)品中,該零件的數(shù)量(件 /臺(tái)) α %備品率 β %廢品率 根據(jù)該公式確定此零件的生產(chǎn)綱領(lǐng)為 100500 件 ,確定其生產(chǎn)類型為小批量生產(chǎn), 相對(duì)來說選取的毛坯精度稍低、加工的余量大。 方案Ⅰ 不進(jìn)行任何處理 方案Ⅱ銑床 精加工 —— 磨 根據(jù)零件的技術(shù)要求,其中六面已經(jīng)加工完成,只有加工完凸臺(tái)之后剩下的表面,因?yàn)樗募庸ぞ刃枰_(dá)到 78精度,所以需要進(jìn)行精加工以保證達(dá)到技術(shù)要求,所以選擇方案Ⅱ 。 而 方案 Ⅰ,總的來說可以實(shí)施,但由于裝夾次數(shù)過多導(dǎo)致零件精度過低,從而達(dá)不到零件的技術(shù)的要求,生產(chǎn)起來也復(fù)雜,所以從各方面來說 , 方案 Ⅰ 不符合零件的要求。 四爪卡盤由于四個(gè)卡爪均可獨(dú)立移動(dòng),因此可安裝截面為方形、長(zhǎng)方形、橢圓以及其它不規(guī)則形狀的工件。實(shí)際所切除的金屬厚度為直徑 上的加工余量的一半,計(jì)算公式如下: 對(duì)于外表面 Zi=Li1Li 對(duì)于內(nèi)表面 Zi=LiLi1 對(duì)于軸 2Zi=di1di 對(duì)于孔 2Zi=Di1Di 式中 Zi 本道工序的單邊余量; Li 本道工序的工序的尺寸 Li1 上道工序的工序 尺寸 Di 本道工序的孔直徑 Di1 上道工序的孔直徑 di 本道工序的外圓直徑 di1 上道工序 的外圓直徑; 各道工序的余量之和為加工總余量。 11 參考文獻(xiàn) [1] 艾興 ,肖詩綱 .切削用量簡(jiǎn)明手冊(cè)(第 3版) .北京 :機(jī)械工業(yè)出版社 ,1994 [2] 許曉旸 .專用機(jī)床設(shè)備設(shè)計(jì) .重慶 :重慶大學(xué)出版社, 2022 [3] 廖效果 .數(shù)字控制機(jī)床 .武漢 :華中理工大學(xué)出版社 ,1992 [4] 廖效果 ,劉又午 .數(shù)控技術(shù) .武漢 :湖北科學(xué)技術(shù)出版社 ,2022,5 12 指導(dǎo)教師意見 指導(dǎo)教師(簽名及時(shí)間): 答辯意見 答辯小組組長(zhǎng) (簽名及時(shí)間): 成績(jī)?cè)u(píng)定 畢業(yè)設(shè)計(jì)(論文) 成績(jī) 答辯成績(jī) 總評(píng) 成績(jī) 13 為你提供優(yōu)秀的畢業(yè)論文參考資料,請(qǐng)您刪除以下內(nèi)容, O(∩_∩)O 謝謝?。?! 2 Many people have the same mixed feelings when planning a trip during Golden Week. With heaps of time, the sevenday Chinese 為你提供優(yōu)秀的畢業(yè)論文設(shè)計(jì)參考資料,請(qǐng)您刪除一下內(nèi)容,O(∩_∩)O 謝謝?。?! National Day holiday could be the best occasion to enjoy a destination. However, it can also be the easiest way to ruin how you feel about a place and you may bee more fatigued after the holiday, due to battling the large crowds. During peak season, a dream about a place can turn to nightmare without careful planning, especially if you travel with children and older people. As most Chinese people will take the holiday to visit domestic tourist destinations, crowds and busy traffic are inevitable at most places. Also to be expected are increasing transport and acmodation prices, with the possibility that there will be no rooms available. It is also mon that you39。s largest virgin forest, and known for its spring and ecological environment, Arxan is marveled at by many tourists as the purest land on earth. You cannot miss out the Autumn of Arxan. It is definitely the best with brightlycolored scenery full of emotions. Autumn in the northern part of the country es earlier than the South. A September rain followed by the footprints of Autumn brings more colors to the once emerald green mountain and blooming grassland. Shutterbugs flock to see for themselves the marvel of splendid colors around the mountains and waters, many of whom have travel a long distance and even camp here only to capture a moment of the nature wonder. The silver birch turns golden, while the larch is still proudly green. You will find yourself drowned in the intoxicating red of the wild fruits as well as the glamour of flowers in full blown. And your heart will be lingering on the woods as it39。 根據(jù)零件的精度要求,精加工已經(jīng)能夠達(dá)到要求,所以精加工時(shí)為最后的一步,不留加工余量 內(nèi)型腔分 進(jìn)行 幾次加工 , 粗 加工余量為 2 mm, 半精加工余量為 mm 對(duì)于平面 半精加工余量為 1 mm。 由于四爪卡盤的四個(gè)卡爪是獨(dú)立移動(dòng)的,在安裝工件時(shí)須進(jìn)行仔細(xì)的找正工件,一般用劃針盤按工件內(nèi)外圓表面或預(yù)先劃出的加工線找正,其定位精度較低,為 ~ 。 本機(jī)床的鑄件均采用樹脂砂鑄件,且經(jīng)過兩次人工時(shí)效處理,穩(wěn)定性好,強(qiáng)度高,各項(xiàng)精度穩(wěn)定可靠。所以選擇 方案 Ⅱ, 方案 Ⅰ只能達(dá)到 8級(jí)以上精度,所以它達(dá)不到零件的技術(shù)要求。根據(jù)設(shè)計(jì)要求制定多種方案,完成對(duì) 復(fù)雜零件加 工工藝設(shè)計(jì)及數(shù)控程序編制確定裝夾方案,定位及相關(guān)的工序內(nèi)容。擴(kuò)孔的加工余量一般為 ~ 4mm。超高 頻淬火處理的硬軌,采用周邊磨削工藝精磨,與其配合的粘貼 TurciteB 耐磨片并精細(xì)研刮,耐磨性好,精度保持長(zhǎng)久。 ( 4)不要在活動(dòng)鉗身的光滑表面進(jìn)行敲擊作業(yè),以免降低配合性能; ( 5)加工時(shí)用力方向最好是朝向固定鉗身。鉸孔為最后一步,不留加工余量。 Festival. In this day, girls will throw a sewing needle into a bowl full of water on the night of Qixi as a test of embroidery skills. If the needle floats on top of the water instead of sinking, it proves the girl is a skilled embroiders. Single women also pray for finding a good husband in the future. And the newly married women pray to bee pregnant quickly.