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您的位置: 首頁 ->  常見問題 -> 鑄鋁廠常見的5種鑄鋁砂芯類型
  為了保證鑄件的質量,砂型鑄造中所用的型芯一般為干態型芯。根據型芯所用的粘結劑不同,型芯分為粘土砂芯、油砂芯和樹脂砂芯幾種。粘土砂芯用粘土砂制造的簡單的型芯。
  砂型鑄造
  為了保證鑄件的質量,砂型鑄造中所用的型芯一般為干態型芯。根據型芯所用的粘結劑不同,型芯分為粘土砂芯、油砂芯和樹脂砂芯幾種。
  粘土砂芯
  用粘土砂制造的簡單的型芯。
  油砂芯
  用干性油或半干性油作粘結劑的芯砂所制作的型芯,應用較廣。油類的粘度低,混好的芯砂流動性好,制芯時很易緊實。但剛制成的型芯強度很低,一般都要用仿形的托芯板承接,然后在200~300℃的烘爐內烘數小時,借空氣將油氧化而使其硬化。這種造芯方法的缺點是:型芯在脫模、搬運及烘烤過程中容易變形,導致鑄件尺寸精度降低;烘烤時間長,耗能多。
  樹脂砂芯
  用樹脂砂制造的各種型芯。型芯在芯盒內硬化后再將其取出,能保證型芯的形狀和尺寸的公差。根據硬化方法不同,樹脂砂芯的制造一般分為熱芯盒制芯、殼芯和冷芯盒制芯三種方法。
  ①熱芯盒法制芯:50年代末期出現。通常以呋喃樹脂為芯砂粘結劑,其中還加入潛硬化劑(如氯化銨)。制芯時,使芯盒保持在200~300℃,芯砂射入芯盒中后,氯化銨在較高的溫度下與樹脂中的游離甲醛反應生成酸,從而使型芯很快硬化。建立脫模強度約需10~100秒鐘。用熱芯盒法制芯,型芯的尺寸精度比較高,但工藝裝置復雜而昂貴,能耗多,排出有刺激性的氣體,工人的勞動條件也很差。
  ②殼芯采用復模砂熱法制芯,砂芯強度高,質量好;
  ③冷芯盒法制芯:60年代末出現。用尿烷樹脂作為芯砂粘結劑。用此法制芯時,芯盒不加熱,向其中吹入胺蒸汽幾秒鐘就可使型芯硬化。這種方法在能源、環境、生產效率等方面均優于熱芯盒法。
  70年代中期又出現吹二氧化硫硬化的呋喃樹脂冷芯盒法。其硬化機理完全不同于尿烷冷芯盒法,但工藝方面的特點,如硬化快、型芯強度高等,則與尿烷冷芯盒法大致相同。
  水玻璃砂芯
  用水玻璃做黏結劑 做的砂芯可分成以下幾種:水玻璃CO2法、酯硬化水玻璃自硬法、水玻璃甲酸甲酯冷芯盒法。
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