科學(xué)化射出成型_-展示頁
2024-08-16 16:58本頁面
【正文】 to day and lot to lot variations ?保證相同部件生產(chǎn)的一致性 , 不受一般的不同機(jī)器 ,生產(chǎn)批號(hào) ,日期之變異所影響 ? Scientific approach to establish all molding variables ?以科學(xué)的方法來建立所有成型的變異數(shù) ? Provides ability to detect and document problems based on data not personal opinions ?能夠用數(shù)據(jù)化的方式來偵測(cè)和紀(jì)錄問題點(diǎn) ,而不是靠個(gè)人觀點(diǎn) ? Can increase profit margin by 20 to 50% ?能夠提高利潤 20%到 50% 4 1. Introduction Profit percentage(利潤百分比 ) 設(shè)備 O v e r h e a d26%人工費(fèi) Labor11%業(yè)務(wù) amp。 行政費(fèi)用S a l e s amp。 Time冷卻速率和時(shí)間 ? Plastic Temperature塑料溫度 7 2. Plastic Flow Rate Fundamentals基本性 ? Its flow pattern is like fountain flow塑料流動(dòng)模式類似于噴泉流動(dòng)模式 ? Chain ends sticks amp。 higher the shear, faster the flow與剪切率比例成正比 : 剪切率越高 ,流動(dòng)率越快 ? Inversely proportional to viscosity。 NonNewtonian fluids are those for which viscosity is not a constant, but varies based upon the rate of shear or the shear 頓流體 是那些黏度不是一個(gè)常數(shù) , 而是隨著剪切應(yīng)力或剪切率變化的流體 11 2. Plastic Flow Rate Momentum Effect 慣性作用 V is c o s ity C u r v e , D e te r m in e s O p tim u m F ill Tim e1 0 . 6 95 . 2 72 . 2 01 . 2 70 . 6 60 . 4 70 . 3 20 . 2 20 . 1 00 . 1 30 . 1 605,00010,00015,00020,00025,00030,00035,00040,00045,000 S h ear R ate 1/ s ec (1/ F ill Tim e)R elativ e V is c o s ityStiff Easy Slow Fast Electric電力 Hydraulic水力 12 2. Plastic Flow Rate MFR Effect MFR 效應(yīng) V is c o s ity C u r v e , D e te r m in e s O p tim u m F ill Tim e1 0 . 6 95 . 2 72 . 2 01 . 2 70 . 6 60 . 4 70 . 3 20 . 2 20 . 1 00 . 1 30 . 1 605,00010,00015,00020,00025,00030,00035,00040,00045,000 S h ear R ate 1/ s ec (1/ F ill Tim e)R elativ e V is c o s ityStiff Easy Slow Fast MFR 6 MFR MFR 10 gm/10 minutes. Shear Rate 1/10/60 = .007 Machine flow rate 30 gm in .5 sec =3/.05=60 13 2. Plastic Flow Rate Melt Temp Effect 融熔溫度效應(yīng) V is c o s ity C u r v e , D e te r m in e s O p tim u m F ill Tim e1 0 . 6 95 . 2 72 . 2 01 . 2 70 . 6 60 . 4 70 . 3 20 . 2 20 . 1 00 . 1 30 . 1 605,00010,00015,00020,00025,00030,00035,00040,00045,000 S h ear R ate 1/ s ec (1/ F ill Tim e)R elativ e V is c o s ityStiff Easy Slow Fast 525 deg F 425 deg F 14 2. Plastic Flow Rate Plastic Viscosity Varies塑料黏度的變化與以下有關(guān) ? With injection speed與射出速度 ? Lot changes, temperature生產(chǎn)批號(hào)變化 , 溫度 ? % regrind, colorants再生料 %,抽料制程 ? Screw rotate time螺桿旋轉(zhuǎn)速度 But these can be minimized by velocity control但這些可經(jīng)速度控制減到最小 What else changes the viscosity?其他改變黏度的因素 : In order to have cruise control
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