A16B-1211-0970導(dǎo)光板在LCD中主要為引導(dǎo)光線前進(jìn)的方向,因此為LCD背光模塊中的重要零件,而導(dǎo)光板的品質(zhì)特性,主要在尺寸、外觀、光學(xué)特性等三方面須有高精度的等級。但在一般射出成型中,由于保壓是由入澆口進(jìn)行模穴保壓,致使產(chǎn)品易有殘留應(yīng)力產(chǎn)生。因此,結(jié)合射出與壓縮的成型方式為新興的制程技術(shù)。 然而不管是射出成型或者是射出壓縮成型制程,其制程參數(shù)相當(dāng)眾多。因此為射出成型法和射出壓縮成型來制造產(chǎn)品尺寸精密度、品質(zhì)要求甚高的導(dǎo)光板,須選擇適當(dāng)?shù)闹瞥虠l件須互相調(diào)整搭配,才能制造出收縮、翹曲及殘余應(yīng)力值小的導(dǎo)光板。再者,于射出成型與射出壓縮成型制程中,由于模穴壓力、鎖模力、模具溫異等因素,亦會影響到模具的精度。 因此本研究旨在探討導(dǎo)光板于射出成型與射出壓縮成型制程下,造成成品精度不佳的主要因素。研究過程分別以C-MOLD和A16B-1211-0970ANSYS工程軟件,模擬射出成型與射出壓縮成型模具的變形產(chǎn)品的收縮分析,并結(jié)合田口品質(zhì)工程法找出最佳制程參數(shù),來探討成品精度不良之因素。 1、前 言 現(xiàn)今的制程領(lǐng)域中,產(chǎn)品不僅朝輕、薄、短、小的目標(biāo)邁進(jìn),且其制造精度亦由以往的厘米,進(jìn)展成現(xiàn)今的次微米,甚至更欲往奈米的目標(biāo)邁進(jìn),如光電系統(tǒng)中關(guān)鍵零組件之一的導(dǎo)光板。由于導(dǎo)光板在LCD中主要為引導(dǎo)光線前進(jìn)的方向,因此為LCD背光模塊中的重要零件,應(yīng)用領(lǐng)域是十分廣泛,舉凡手機(jī)屏幕、筆記型計算機(jī)、影像電話、小型電視等,由于這些產(chǎn)品目前幾乎是人人所須具備的隨身工具,因此面對如此龐大市場,目前業(yè)界在制造導(dǎo)光板皆以具有低成本、高產(chǎn)量及可行自動化優(yōu)點的射出成型法滿足高精度產(chǎn)量之需求。 而導(dǎo)光板的品質(zhì)特性,主要在尺寸、外觀、光學(xué)特性等三方面須有高精度的等級,雖然目前業(yè)界大多采用射出成型來制造,A16B-1211-0970但是對于尺寸長厚比大的導(dǎo)光板而言,在尺寸、外觀、和學(xué)特性上即無法達(dá)到高精度的要求。此乃因為在傳統(tǒng)的射出成型中,在每次制程循環(huán)中,保壓是由油壓缸加壓,使入澆口的壓縮,但由于壓力源皆是由入澆口傳遞,致使產(chǎn)品易有流動殘留應(yīng)力產(chǎn)生、熔膠分子流向明顯,因此很難同時兼顧到讓成品收縮量減少、模穴內(nèi)壓力降低及熔膠分子定向減少,這些情形諸如:增加保壓壓力 或保壓時間,雖然可減少收縮,卻增加內(nèi)應(yīng)力與分子定向;再者,提高模具溫度與塑料溫度,雖然可減少壓力降及熔膠分子的定向,卻會增加成品的收縮,以及讓成形周期時間增加。所以,為了改善傳統(tǒng)保壓方式的缺失,使能制造出尺寸精確、性質(zhì)優(yōu)異的產(chǎn)品,逐發(fā)展一新興的制程技術(shù)一射出壓縮成型(Injection Compress Molding,ICM)。
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