科學(xué)化射出成型_(文件)
【正文】 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。 Time Cooling Time is the profit killing giant 冷卻時(shí)間 是利潤(rùn)的最大殺手 Injection cycle ponents。 如通過冷卻管路 The most effective and the one we can control– 是最有效的和我們能控制的 It’s a science but often done poorly 是 科學(xué) 但經(jīng)常很少有效的去執(zhí)行 20 4. Cooling Rate amp。 Time Reynolds’ for 1/8” amp。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。 Thermal properties of the plastic塑料之硬度和熱力特性 ? Release Characteristics amp。 feed to metering section進(jìn)入深度比 。 change either in isolation and the Shear Rate : 剪切率與衝程是成正比與射入時(shí)間成反比 。 higher temp 高比率會(huì)使塑料工作更快 。 insulated 一致溫度 ,需作絕緣 ? Clean it with vacuum以真空清洗 Material Drying using dehumidifier at 40F. 物料使用除濕乾燥機(jī)在 40F干燥 。壓力 23 4. Cooling Rate amp。 Time Cooling Line Connection冷卻管路連接 Parallel Flow平行流動(dòng) Blockage in multicavity多洞穴之阻塞 Uneven flow thru Channels 通過管路時(shí)流量不均 Maximum Cooling 最大值冷卻 Largest GPM demand最大的 GPM需求 Least deltas: T amp。 Reynolds 亂流 。 Time Basics of Cooling冷卻的基本知識(shí) ? Radiation輻射 Mold radiates energy in all direction模具在所有方向放熱能量 Not usually visible 通常不可視 Infrared waves can be monitored 紅外線可被監(jiān)測(cè) ? Convection對(duì)流 Energy is emitted through air currents 能量通過氣流散發(fā) Hot air rises, less dense 熱空氣上升 , 較輕 Mold faces sees an updraft 模具正面有上升氣流 ? Conduction傳導(dǎo) Energy is transferred through contact。 unsealed)保壓壓
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