【正文】 與黏度比例成反比 :黏度越低 ,流動(dòng)率越快 ? Big misunderstanding about MFR, it doesNOT correlate to processability 對(duì) MFR的誤解 , 它與加工能力無(wú)關(guān) ? Whatdoes it affect?它的影響 8 2. Plastic Flow Rate Typical Plastic Flow 典型的塑膠流動(dòng)率 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 e 黏度曲線 ,決定最佳注入時(shí)間1 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 9 2. Plastic Flow Rate Typical Plastic Flow 典型的塑膠流動(dòng) 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 e 黏度曲線 ,決定最佳注入時(shí)間1 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 T im e)R elat iv e V is c o s ityStiff Easy Slow Fast Non Newtonian Mixed Newtonian 10 2. Plastic Flow Rate Newtonian fluids can be defined as those for which viscosity is a constant regardless of shear stress or rate of shear. 牛頓流體 可被定義為黏度是一個(gè)常數(shù) ,不隨著剪切應(yīng)力或剪切率變化的流體。壓力 ? Series Flow串聯(lián)流動(dòng) Blockage found quickly阻塞可迅速找到 Even flow thru Channels 通過(guò)流道流量均勻 Average Cooling? Delta T 平均冷卻值 Minimum GPM demand –最小值 GPM需求 Maximum deltas: T amp。 higher temp 高比率會(huì)使塑料工作更快 。 Reynolds 亂流 。Symbol Technologies Scientific Injection Molding 科學(xué)化射出成型 (Process Optimization) (過(guò)程最優(yōu)化 ) Johnny Singh 2 CONTENTS內(nèi)容 1. Introduction簡(jiǎn)介 2. Plastic Flow Rate塑料的流動(dòng)率 3. Plastic Pressurel 塑料的壓力 4. Cooling Rate and Time冷卻的速率和時(shí)間 5. Plastic Temperature塑料的溫度 6. Characteristics to Monitor塑料 特性之監(jiān)控 7. Molding Window optimizationl 成型窗口最優(yōu)化 8. Appendix附注 3 1. Introduction Scientific Injection Molding ? Ensures that identical parts are produced consistently independent of the normal machine to machine, day 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(lái)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(lái)偵測(cè)和紀(jì)錄問(wèn)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(rùn) 20%到 50% 4 1. Introduction Profit percentage(利潤(rùn)百分比 ) 設(shè)備 O v e r h e a d26%人工費(fèi) Labor11%業(yè)務(wù) amp。 Time Conduction Cooling傳導(dǎo)冷卻 : ? Depends on:依靠 Turbulent flow。進(jìn)料到測(cè)量部分 Range: :1