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                                                                                                                                【擴大鈦應用】時尚美觀的鈦眼鏡

                                                                                                                                20世紀80年代初,鈦眼鏡架首先出現在美國和日本,距今已有40余年,中國出現鈦眼鏡架比日本約晚20年,但現在已相當普及了。2021年,60歲以上需要戴眼鏡的老年人約有2.5億,其他年齡段需要戴眼鏡的人約0.5億,因此,中國目前保有的眼鏡數約在3億副以上,據估算鈦眼鏡達1億副。

                                                                                                                                為什么會有這么多的鈦眼鏡呢?主要是因為鈦及鈦合金具有無可替代的優秀性能。其主要的優點是:比強度高、質輕、堅韌,鈦的密度為4.51g/cm3,是鋼的57%,不到鋁的2倍,而抗拉強度卻為鋁的3倍,在常用的金屬材料中,鈦合金擁有最大的比強度,為29MPa/cm3/g,是不銹鋼的3.5倍、鋁合金的1.3倍、鎂合金的1.7倍;抗腐蝕性強,鈦及鈦合金有一層薄而堅實的氧化膜,該氧化膜抗蝕性很強,對化學物質以及各種生活污物有很強的抗蝕性,對人體汗液也是如此。

                                                                                                                                眼鏡架結構由眼鏡框、眼鏡腿、夾鼻架、鉸鏈、折彎角片、夾鼻板6個零件組成。

                                                                                                                                鈦眼鏡

                                                                                                                                眼鏡框

                                                                                                                                鈦眼鏡框是用冷拔或冷軋線材加工制備的,眼鏡框有很強的觀賞性,所以,眼鏡框樣式多種多樣,其加工制造是一種較為精細的技藝。

                                                                                                                                鏡片輪廓為矩橢圓形,確保其原型是眼鏡框的首要任務,每副鏡框的輪廓應高度一致,每批產品間的誤差都應在標準規定范圍內,對鏡框材料的彎曲性能特別是均質性有嚴格要求。一般多采用三維數控彎曲機床自動加工鏡框。

                                                                                                                                鏡片的折彎角片也是一個關鍵零件,裝入鏡片時,要緩松小螺釘,固定鏡片后,再擰緊小螺釘。采用點焊機進行釬焊,電極位于焊件的上下方,以氬弧保護,嚴防氧化。

                                                                                                                                眼鏡腿

                                                                                                                                眼鏡腿是吊掛于耳上的零件,有彈性,配戴時不得變形,應十分貼合面部、不松不緊,要能微調,表面美觀優雅。制備工藝為模鍛、沖壓、拋光、彎曲、焊接鉸鏈(折頁)、切開。

                                                                                                                                模鍛就是在線材長度方向上改變其斷面使其符合所設計的樣塊斷面的一種工藝,使用多頭模鍛機或計算機數字控制(CNC)連續模鍛加工;沖壓是使用上、下模具將模鍛的半成品在沖床上將設計的圖案沖制于鏡腿上;拋光是在自動拋光機上對鏡腿進行表面光亮加工;彎曲加工是在小沖床上將折彎角片釬焊于鏡框接合部位,將鏡框與鏡腿連接起來;切割分離工序是為了讓鏡腿與鉸鏈(折頁)自如地折疊,就先要將其分離,這種分開工作在專用銑床上進行。

                                                                                                                                夾鼻架是連接兩個鏡框的零件,是用線材在凹模上沖壓與切削加工的,兩端應與鏡框彎曲度吻合,再點焊而成,要求材料有足夠的強度,佩戴時不易變形;鉸鏈(折頁)是確保鏡腿折疊的關鍵零件,點焊于鏡腿或鏡框上,要求材料有高的可切削性能和耐磨性能;折彎角片是一個小小的零件,精密切削加工的,使用與鉸鏈相同的材料;卡鼻板是支撐鏡框卡于鼻上的零件,可用拉伸加工性能和彎曲性能好的鈦材制造。

                                                                                                                                鈦合金是制造鏡架的最佳材料,鏡架用的鈦絲有純鈦、鈦-鎳合金及β鈦合金。日本福井縣是日本鈦鏡架及全球鈦鏡架制造中心之一,日本制造的鈦鏡架90%出自該縣。日本1981年開始研發鈦-鎳合金鏡架,1986年上市銷售,該鏡架具有優雅的柔和感,深受用戶喜愛,即便予以很大的力使其變形,只要去掉外力又會恢復原狀,有一種舒適的體貼感,戴上不會有壓抑感,得到人們(特別是青少年)的喜愛,即使被碰撞變形了,也不會破損。

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