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          您當前的位置:首頁 > 技術服務 > 技術支持 技術支持

          橡膠注射機的規格

          發布日期:2016/8/19 10:46:51

          橡膠注射機的最大注射容積來表示,單位是立方厘米;一般設備制造廠表明的最大注射量,是理論最大注射量,實際的橡膠注射機制造和使用過程中產生的偏差,使得橡膠注射機實際最大注射量與最大理論注射量有一定偏差;
          理論橡膠注射機注射量是指橡膠注射機中的螺桿(柱塞)在一次最大行程中橡膠注射機注射裝置所能推出的最大塑化熔料量(cm3)。理論注射量是橡膠注射機的主要性能參數。從這個參數中可以知道橡膠注射機的加工能力,從而可確定一次注射成型塑料制品的最大質量。
          國家標準GB/T 12783—1991中規定,理論注射量的大小用物料熔融狀態時質量(g)或容積(cm3)表示。目前,國內和世界各國用容積(cm3)標注方式較多,因為物料容積與物料熔融狀態的密度無關,此種標注方法適應于任何塑料的計量。
          理論橡膠注射機注射量計算公式為
          式中 QL——理論注射量,cm3;
          D——螺桿(柱塞)直徑,cm;
          S——螺桿(柱塞)的最大行程,cm。
          由于螺桿(柱塞)外徑與機筒內徑之間有一個相互運動的裝配間隙,當螺桿(柱塞)推動熔料前移時,受噴嘴口直徑縮小和物料與機筒內壁摩擦等阻力影響,會有一部分料從間隙中回流。另外,熔料冷卻時會有一定收縮量需要補充。所以,注塑機的實際注射量要小于理論注射量,計算時需要用系數K值修正,K值的大小與螺桿(柱塞)的結構及參數、外徑和間隙、注射力的大小、熔料流速、背壓大小、模具結構、制品形狀和塑料的性質等因素有關。當螺桿頭部有逆止閥時,取K值為0.9;如只考慮熔料的回流時,取K值為0.97。
          即實際注射量
          如果知道塑料制品的質量,在選擇橡膠注射機時,則熔融狀態下塑料的容積換算為密度。即
          式中 Qs——注塑機實際注射量,g;
          ρr——塑料熔融狀態下的密度,g/cm3。

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