【正文】
很形象,再加上對UG數(shù)字化建模的熟悉,所以選擇了UG這個軟件生成零件的立體圖。手動編程與自動編程應(yīng)用較多。s request. The bench vise satisfies the request which sufficiently the ponents attire clamps. The processing ponents choice reasonable stage prop, the rough milling semifinished materials quantity is big, carries on the processing with the face milling cutter, other uses φ6 end mill processing. The spherical surface processes with φ6 the spherical cutter. Figures out the cutting specifications according to the cutting tool and the ponents request, the formulation process chart. numerical control milling machine ponents add the project the foreword establishment. Manual piled the ponents the processing program, in the ponents procedure applies the round angle great procedure, the spherical surface great procedure, the conic section great procedure. Used G68 to revolve the fixed cycle. What ponents processing is the internal structure, therefore from, to all around carries on the processing from among. Carries on the thick precision work separatelysuccessively according to process chart39。根據(jù)工藝卡片的要求分先后分別進(jìn)行粗精加工。臺虎鉗足以滿足零件裝夾的要求。本次設(shè)計我使用手動編程。手動編寫出零件的加工程序,零件的程序中應(yīng)用到了倒圓角的宏程序,球面的宏程序,二次曲線的宏程序。s procedure. Completes this design to obtain from the following several steps: pair gives the detail drawing carries on the analysis. This ponents are the symmetric figure, the size request are not high, but has the fillet, the surface and the conic section plex structure, requests high to the processing procedure. According to the detail drawing, the reasonable idea processing sequence, and the digitized modelling, draws the ponents with the UG software the block diagram, and chooses the semifinished materials material and the size. ponents carry on the technological analysis. The processing ponents are the symmetrical graph, a ponents39。短時間內(nèi)制定零件的加工程序,可以有效的縮短數(shù)控加工時間。根據(jù)零件圖,用UG生成零件圖的同時定下零件的內(nèi)部腔體的加工順序。 零件的工藝分析零件形狀是對稱的,所以用零件的幾何中心為加工中心。[2]手動編制宏程序,不僅語言簡練而且嚴(yán)謹(jǐn)。并且在兩橢圓正交形成的四個拐角進(jìn)行倒圓角,第一階梯橢圓圓角半徑R=8mm,第二階梯橢圓半徑R=10mm。腹板厚度30mm,且面積大,加工時不易發(fā)生振動,對加工的不利影響較小。然后用橢圓一層層的往下銑削除,每次銑3mm的深度,最后一次銑4mm,然后旋轉(zhuǎn)90度,重復(fù)以上步驟。以上表面幾何中心原點(diǎn)為橢圓的中心點(diǎn),創(chuàng)建橢圓,長軸為80,短軸為30的橢圓。再對內(nèi)腔底部進(jìn)行R=4mm的邊倒圓。零件的毛坯是規(guī)則(100*100*30)長方體,零件也是規(guī)則的圖形,所以基準(zhǔn)無特殊要求。圖3 零件的裝夾 確定加工順序及走刀路線加工順序的擬定按照基面先行、先粗后精的原則確定。每一層的加工都是如此。 選擇零件銑削加工時的刀具 加工本零件刀具的基本要求(1) 銑刀的剛性要好要求銑刀剛行好的目的,因為在粗銑105*105*35的毛坯時為了提高生產(chǎn)效率而采用的大切削用量的需要。常用的銑刀有:高硬度銑刀、T型槽銑刀、球頭端銑刀、超長硬質(zhì)合金球頭銑刀、精加工鏡面球頭銑刀、半精加工球頭銑刀、球頭銑刀等。球頭立銑刀它的結(jié)構(gòu)特點(diǎn)是球頭或斷面上布滿了切削刃,圓周刃和球頭刃圓弧連接,可以作徑向和軸向進(jìn)給。進(jìn)給量與進(jìn)給速度是數(shù)控銑床加工切削用量中的重要參數(shù),根據(jù)零件表面的表面粗糙度、加工要求精度、刀具及材料等因素,參考表2選取。其計算公式為: () —切削速度,單位為 —主軸轉(zhuǎn)速,單位為 —刀具直徑,單位為。手工編程從工藝分析、數(shù)值計算、到數(shù)控程序的校驗、試切、修改均由人工完成。程序中用絕對編程G90指令,G54來選取設(shè)定的坐標(biāo)系,在XOY平面內(nèi)加工用G17來確定。M98P1001。G00Z5.。G01X31.。G00G41X0Y0D1。G69。Z5.。3=0。G00X40Y0。G01X[4]Y[5]F100。2=12.。M99。M98P9001。G00Z30.。6=ASIN[]。8=1*COS[7]。WHILE[7LT90]DO2。M99。M98P8001。G00Z30.。5=ACOS[]。WHILE[7LT5]DO1。7=6+1。G00G40X0Y0。22=20*COS[11]19。11=111.。G54G90G17G00X0Y0。M05。X[52]。G18G03X7Z8R12F40。通過這次的畢業(yè)設(shè)計,我對現(xiàn)在數(shù)控加工有了更深的了解,并且對整個加工過程有了全面的認(rèn)識。用它我加工出了曲面和圓角,這是我這次設(shè)計的最大收獲。當(dāng)然同學(xué)間的互相幫助和鼓勵也是我完成的動力。并且數(shù)控加工在模具制造行業(yè)中使用大概在百分之六十,對以后的工作是很好的鋪墊。對零件圖的分析更加熟練,根據(jù)它定出毛坯,在按照加工零件的內(nèi)部結(jié)構(gòu)選擇合適的刀具,并確定裝夾方案。END 1。G01X5F400。圖14 立體圖子程序主程序所需坐標(biāo)、角度圖15給出,AutoCAD出圖截取O7001。M03S1600。GOTO 5N99 G00Z30.。24=2022。 橢圓內(nèi)腔底部倒圓角本程序加工的零件見圖13