光(guang)學零件加工(gong)(gong)(gong)的工(gong)(gong)(gong)藝(yi)(yi)(yi)流程隨加工(gong)(gong)(gong)方(fang)式(shi)不同而異。光(guang)學零件的加工(gong)(gong)(gong)方(fang)式(shi)主要(yao)(yao)有(you)兩類:傳(chuan)統(tong)(tong)(古典)加工(gong)(gong)(gong)工(gong)(gong)(gong)藝(yi)(yi)(yi)和機(ji)械化加工(gong)(gong)(gong)工(gong)(gong)(gong)藝(yi)(yi)(yi),中小批(pi)量主要(yao)(yao)以傳(chuan)統(tong)(tong)加工(gong)(gong)(gong)工(gong)(gong)(gong)藝(yi)(yi)(yi)為主。傳(chuan)統(tong)(tong)工(gong)(gong)(gong)藝(yi)(yi)(yi)的特點主要(yao)(yao)有(you):
1、使用(yong)散粒磨(mo)料及(ji)通(tong)用(yong)機(ji)床,以輪廓成(cheng)形(xing)法(fa)對(dui)(dui)光學玻璃進行(xing)研磨(mo)加工。操(cao)作中以松香柏(bo)油粘結膠為主進行(xing)粘結上盤(pan)。先(xian)用(yong)金剛砂對(dui)(dui)零件(jian)(jian)進行(xing)粗磨(mo)與精(jing)(jing)磨(mo),然后使用(yong)松香柏(bo)油拋光模與拋光粉(主要是氧(yang)化鈰)對(dui)(dui)零件(jian)(jian)進行(xing)拋光加工。影響(xiang)工藝(yi)的因素多而易變,加工精(jing)(jing)度(du)可(ke)變性也(ye)大(da),通(tong)常是幾個(ge)波(bo)長數(shu)量級(ji)。高精(jing)(jing)度(du)者(zhe)可(ke)達幾百(bai)分之一波(bo)長數(shu)量級(ji)。
2、手工(gong)操(cao)作量(liang)大(da),工(gong)序多,操(cao)作人員技術要求(qiu)高。對機(ji)床精度,工(gong)夾磨具要求(qiu)不那么苛刻,適于多品種,小批量(liang)、精度變化大(da)的加工(gong)工(gong)藝采用。
傳(chuan)統加工工藝(yi)過程,以(yi)一個(ge)透鏡為例(li),先后依次經(jing)過以(yi)下一些(xie)工序:
(1)毛(mao)坯加(jia)工。包括(kuo)按光(guang)學零(ling)件圖選擇合適的塊(kuai)料,切割(ge)整平、劃分、膠條、滾圓開球面。
(2)粗(cu)(cu)磨加(jia)工。使表面粗(cu)(cu)糙度(du)及球面半徑符(fu)合(he)細磨要求。傳(chuan)統工藝(yi)中(zhong)粗(cu)(cu)磨是(shi)單(dan)件進行(xing)的。一般(ban)采(cai)用傳(chuan)統工藝(yi)加(jia)工的工廠(chang)中(zhong),粗(cu)(cu)磨車間往(wang)往(wang)包括毛坯加(jia)工。
(3)上(shang)(shang)盤:粗磨(mo)之后,經清(qing)洗,將一(yi)個個透(tou)鏡(jing)毛坯按(an)同半徑組(zu)合(he)成盤。即依靠粘結(jie)膠把分散的(de)透(tou)鏡(jing)固定在球(qiu)形粘結(jie)膜上(shang)(shang),應注意的(de)是(shi)成盤時要使(shi)每一(yi)個透(tou)鏡(jing)毛坯的(de)被加工(gong)面都處(chu)于(yu)同一(yi)半徑的(de)球(qiu)面上(shang)(shang)。
(4)細磨(mo)拋(pao)(pao)光(guang)工(gong)序。在加(jia)工(gong)**表面(mian)(mian)(mian)時,細磨(mo)到拋(pao)(pao)光(guang)過程中一(yi)(yi)般是不需(xu)拆盤的(de),即一(yi)(yi)次一(yi)(yi)盤完成。操(cao)作中,先使(shi)用粒度(du)依次變細的(de)三至四道金鋼砂將被加(jia)工(gong)面(mian)(mian)(mian)研磨(mo)到拋(pao)(pao)光(guang)要求的(de)表面(mian)(mian)(mian)粗糙度(du),然后(hou)清(qing)洗,進(jin)行拋(pao)(pao)光(guang)。拋(pao)(pao)光(guang)是用一(yi)(yi)定(ding)半徑的(de)拋(pao)(pao)光(guang)模加(jia)拋(pao)(pao)光(guang)粉進(jin)行。一(yi)(yi)面(mian)(mian)(mian)加(jia)工(gong)完畢后(hou),涂(tu)上(shang)保護膜,翻面(mian)(mian)(mian)再進(jin)行上(shang)盤。細磨(mo)拋(pao)(pao)光(guang)加(jia)工(gong)第二表面(mian)(mian)(mian)。
(5)定心磨邊工(gong)序(xu)。透鏡加工(gong)過程(cheng)中會出現光軸(zhou)和定位軸(zhou)偏(pian)離(稱為偏(pian)心)。定心磨邊的任(ren)務是消除偏(pian)心,并使側圓柱面徑(jing)向尺寸達到裝配(pei)要(yao)求。傳(chuan)統工(gong)藝(yi)的磨邊常在光學定心磨邊機(ji)上進行(xing)。
(6)鍍(du)膜(mo)(mo)工序(xu),對(dui)表面(mian)有透光要(yao)求(qiu)的(de)透鏡,要(yao)加鍍(du)增透膜(mo)(mo)。球面(mian)反射鏡要(yao)鍍(du)反射膜(mo)(mo)。有的(de)還要(yao)鍍(du)其(qi)它性質(zhi)的(de)薄(bo)膜(mo)(mo),依使用(yong)要(yao)求(qiu)由設計(ji)決定。
(7)膠(jiao)合工(gong)序。對成象質量(liang)要求(qiu)較高的鏡頭(tou),往往采用幾塊透(tou)鏡膠(jiao)合而成。膠(jiao)合應在鍍(du)膜以后(hou)進行(xing)。
