【正文】 suit the injection molding machine and mold structure reasonable and eject air well, pressure of this step should lower 80%.Molding speed setting within 5580% but it may setting 95% for especial ,其速度和壓力根據(jù)產(chǎn)品的需要,一般是小于第二段, inject remain 1/3 of to product molding speed and pressure lower than that of step2 To prevent flash speed and pressure should decrease but it can’t shot :一般有機臺還有第五,第六段,這段的成型速度和壓力相同前, section: Some injection machines have step5,step6 which are same as former molding speed and pressure this step should diminish and inject once :不論成型什么產(chǎn)品,正常情況下,較厚的部分都可能存在一個收縮凹陷的現(xiàn)象,為了解決這種現(xiàn)象,就應(yīng)應(yīng)用到保壓,保壓一般來講都應(yīng)用較慢的射速,而壓力的設(shè)置則應(yīng)看縮水的情況如何,小到25%,大到80% pressure step: No matter what product there is a holding pressure product can’t molding a same the deeper section may sink prevent this defect it should set holding pressure, The injection speed of holding pressure step is slow but holding pressure setting within 2580% depending on sink lastic Technique ,因為熔膠本身就是存在于把膠熔進料筒的過程,如果原料粘度大,熔膠壓力則大,但速度則應(yīng)取決于原料的分解溫度,熔膠速度越快,原料中的剪切力則會越大,料管溫度則越高,局部原料產(chǎn)生分解的可能性則會越大,故一般熔膠會采用中速為宜,如45%75%,熔膠同時會碰到一個比較重要的環(huán)節(jié),那就是背壓的使用,產(chǎn)品精度要求越大,背壓的使用則更大,背壓可使原料分子間結(jié)構(gòu)更緊密,成型出的產(chǎn)品則尺寸更穩(wěn)定,背壓太大,則會產(chǎn)生流涎, should lower 3 steps, because plastic is a step to add melt resin material to cyclinder , Higher stick of resin material ,higher screw back speed differs depending on deposing temperature of resin material ,Higher screw speed ,Highertrim force of resin, higher cyclinder resin material may deposes so it set screw speed in midspeed such as 4575%, In plastic step setting screw back pressure is very important, Higher screw back pressure ,higher quality of product screw back pressure make resin structure order, Molding product is beautiful and volume ,it maybe flow if screw back pressure too all factors should be considered when using screw back ,那就是松退,松退分前松退和后松退,其作用一般是為了防止流涎和抽絲,設(shè)定值速度和壓力都在20%50%間,設(shè)定的行程一般在25cm間,太長的行程可能會使料筒里面貯存空氣, plastic step sucking back is very important back include front sucking back and back sucking back It setting sucking back to prevent flow and sets sucking back speed and pressure within 2050% and distance within long distance make cyclinder reserve air and cause bubble at next knocking out technique setting 產(chǎn)品經(jīng)冷卻定型后則有一個開模的過程,開模完成后, is a mold opening step after product cooling taking opening is a reverse step of mold last step of mold opening speed set should be knocked out after mold : Knocking out 頂前最好分兩個階級,第一階可分為中壓慢速,即是把產(chǎn)品輕輕頂出一部分,然后是中壓中速頂,中壓中速一般指的是35%55%,而低速則有可能低到5%,這需視產(chǎn)品不同而言, out includes two steps, Step1 section setting midspeed, knocks product out partly step2 section setting midpressure and on different product, midpressure and midspeed sets within 3555% but lowspeed can set 5%.Distance of knocking out longer 12cm than the vertical thickness of Back 頂退包括兩個過程與頂落的過程基本一致,頂退的終點應(yīng)預(yù)留13cm的空間, same as knocking out, ejector back includes 2 protect the ejector oil jar, it should make a 13mm distance in the ending point of ejector ,單次頂及頂針停留的選擇,機械手取產(chǎn)品,脫模順利的情況都采取多項,為了頂針油缸 壽命的延長,多次頂就以不超過三次為宜,頂針停留一般用在頂針帶著產(chǎn)品退回有可能對增品產(chǎn)生損傷的模具,同時為配合機械手使用, way of knocking out includes knocking out once, Knocking out repeat and ejector product by manipulator or take product easy, it should select knocking out longer the work time of ejector oiljar, times of knocking out lower 3 delay used when product will be damaged if ejector back or suit Molding time setting 在保證產(chǎn)品質(zhì)量的前提下,周期時間是越短越好,周期時間又包括如下幾項:射膠時間,保壓時間,熔膠時間,冷卻時間,頂出時間,鎖模低壓時間,甚至乎關(guān)系到時間因素的還有還開模與鎖模, time should shorter on condition that product quality time includes: injection time , holding pressure time, plastic time, cure time, knocking out time and mold protect mold opening closing sopeed and knocking out speed affect ,一般看起來,射膠時間越長,產(chǎn)品越飽和,但我們在講求質(zhì)量時,同時也須考慮產(chǎn)能,更何況,射膠時間過長,有可能會造成產(chǎn)品過于飽滿而尋致粘模頂?shù)淖冃螀沾缙蟮纫幌盗袉栴},故我們在設(shè)置射膠時間時應(yīng)綜合考慮, time consists holding pressure injection time, fuller product, we should consider production quantity when we suit for injection time too long, it may cause a series of defects suck as flash all sorts of factors should be considered, injection time should be shout if quality suit for ,背壓設(shè)定的大小,但有一點, time depends on plastic speed and screw back pressure, but plastic time must shorter than cure :冷卻時間的長短直接影響到成型的周期,冷卻時間越長,成型時間就越長,造成產(chǎn)能就越低,故我們在設(shè)定高壓冷卻時間時,只要能保證到產(chǎn)品成型順利,不會直接影響到變形等問題, time: Cure time affects molding cure time, longer molding cycle, lower production it sets cure time short on condition that product molding succed and can’t deformation..,我們的頂出時間一般是與機械手配合為宜,半自動生產(chǎn),如因頂針退回會導(dǎo)致產(chǎn)品掉落或卡緊,而取不下產(chǎn)品, PCE pany, for using manipulator in abundence , knocking out time suitsmanipulator, Knocking out delay keeps second when using manipulator fullmanipulator, knocking out delay keeps about 5 second when using manipulator semimanipulator and product will fall or can’t be taken off if ejector ,模具安全起很大作用,配合好模具低壓位置和低壓壓力的調(diào)整,低壓保護的時間應(yīng)取13秒,保護時間越短, protect is very important for safety and protect mold, Mold protect time should adjust within 13 second suit low pressure and position of mold protect, shorter protect time, make Appearance 外觀 Glossiness/gloss finish 光潔度 Matt finish/matt surface 毛面Glass fiber rich surface/glass emergence on the surface 玻纖外露 Blooming/surface blooming 表面析出 White patches on surface 表面白斑 Silver marks/silver streak 銀紋 Splay mark 水紋 Flow mark 流紋 Weld line 溶結(jié)紋 Brittle/brittleness 脆 Bubbles/trapped gas 氣泡 Void 孔Burn marks 燒傷FR failed 阻燃不合格 Flame rating V2 阻燃V2 Poor dispersion 分散不好FR/PTFE …agglomerates etc 阻燃劑/PTFE…結(jié)塊 Pellet porous 粒子不密/蜜蜂窩 Low impact/tensile etc 物理性能低H