【正文】
he continuous transformation, the innovation provides a bigger space, but also must take the original product as the foundation, the increase automation, integrated or the systematized function. Must pletely change the present industry sewing machine basic organization type the possibility not to be big, even if likes the cyclical sewing machine such with the electronic control technology substitution cam gear, that also is only the control mode change, achieved the simplification organization the goal, certainly not radically changes likes the nail catcher machine, make eyes machine and the set of knot machine basic function structure type. The present paper mainly is mainly to one kind of sewing machine set of knot machine, carries on a series of designs to its nose structure and the processing craft. And processes the cutting tool to the sewing machine nose material choice the model, the material quality carries on the analysis confirmation, draws the type with AUTCAD the machined surface, and designs the jig the reliability, the feasibility, finally designs the good processing craft, according to processes the craft to choose the origin of coordinates, carries on the numerical control programming with the FUNIC system to its craft. Finally will process the nose, passing will examine, the assembly, after the quality testing, will determine the processing the feasibility..Keywords: Structural design; Processing craft FANUC system; Numerical control programming第1章 緒論 18世紀(jì)歐洲掀起工業(yè)革命的高潮,紡織業(yè)實(shí)現(xiàn)了機(jī)械化的大生產(chǎn),隨之也對縫制機(jī)械化提出了迫切的要求,各種縫制機(jī)械也應(yīng)運(yùn)而生。數(shù)控機(jī)床是綜合應(yīng)用了計算機(jī)技術(shù)、自動控制、精密測量和機(jī)床設(shè)計等技術(shù)而發(fā)展起來的,采用數(shù)字化信息對機(jī)床運(yùn)動及其加工過程進(jìn)行自動控制的自動化機(jī)床。這些豐富的信號和編程指令便于用戶編制機(jī)床側(cè)PMC控制程序,而且增加了編程的靈活性。而專用刀具一般根據(jù)加工工件的形狀、尺寸、技術(shù)要求進(jìn)行專門的設(shè)計與制造。按銑刀的齒背形式可將銑刀分為尖齒銑刀和鏟齒銑刀兩大類。刀具材料越硬,其耐磨性越好,但由于切削條件較復(fù)雜,材料的耐磨性還決定于它的化學(xué)成分和金相組織的穩(wěn)定性。其強(qiáng)度和韌性是現(xiàn)有刀具材料中最高的。與傳統(tǒng)的加工方法相比,數(shù)控加工對刀具的要求更高。 b) 二.切削用量的確定 切削用量包括主軸轉(zhuǎn)速(切削速度)、背吃刀量、進(jìn)給量。在數(shù)控加工前,要將機(jī)床的運(yùn)動過程、零件的工藝過程、刀具的形狀、切削用量和走刀路線等都編入程序,這就要求程序設(shè)計人員具有多方面的知識基礎(chǔ)。調(diào)整好機(jī)床并調(diào)用該程序后,就可以加工出符合圖紙要求的零件。在調(diào)機(jī)時,必須要注意下刀的速度,要慢慢下刀,時刻觀察刀具與零件的距離,以及對照程序的Z軸數(shù)字,來判斷是否下刀安全,并且在加工的同時,應(yīng)檢查刀具長度補(bǔ)償?shù)臄?shù)值是否測量準(zhǔn)確,這樣有利于保護(hù)刀具和保證零件的質(zhì)量。半年多來,李教授不僅在學(xué)業(yè)上給我以精心指導(dǎo),同時還在思想、生活上給我以無微不至的關(guān)懷,在此謹(jǐn)向李老師致以誠摯的謝意和崇高的敬意。在手動編程中,用到的主要指令是G43長度補(bǔ)償指令,這個在手動編程中,占很重要的作用,關(guān)系到刀具在加工面的安全問題和零件的尺寸精確度很大的關(guān)系。此外,在選擇和決定加工內(nèi)容時,也要考慮生產(chǎn)批量、生產(chǎn)周期、工序間周轉(zhuǎn)情況等等。 3)進(jìn)給量(進(jìn)給速度)f(mm/min或mm/r)進(jìn)給量是數(shù)控機(jī)床切削用量中的重要參數(shù),主要根據(jù)零件的加工精度和表面粗糙度要求以及刀具、工件的材料性質(zhì)選取。 P類相當(dāng)于我國原鎢鈦鉆類,主要成分為WC十TiC十Co,代號為YT。因此在選用時一定要綜合考慮。加工精度可達(dá)IT6~~。采用夾具裝夾工件,易于保證加工精度、縮短輔助時間、提高生產(chǎn)效率、減輕工人勞動強(qiáng)度。FANUC對自身的系統(tǒng)采用比較好的保護(hù)電路。在政府的資助下,日本開始生產(chǎn)廉價的家用縫紉機(jī),銷往世界各國,年產(chǎn)10萬臺左右。要徹底改變目前工業(yè)縫