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壓力鑄造的優點
點擊:2399    發布單位:www.bytespress.net    發布時間: 2019/3/1

壓力鑄造是指將熔融或半熔融的金屬以高速壓射入金屬鑄型內,并在壓力下結晶的鑄造方法,簡稱壓鑄。常用壓射壓力為30~70MPa,充填速度約為0.5~50 m/s,充填時間為0.01~0.2 s

1、壓力鑄造的優點
1)生產率高,易于實現機械化和自動化,可以生產形狀復雜的薄壁鑄件。壓鑄鋅合金最小壁厚僅為0.3mm,壓鑄鋁合金最小壁厚約為0.5mm,最小鑄出孔徑為0.7mm。
2)鑄件尺寸精度高,表面粗糙度值小。壓鑄件尺寸公差等級可達CT3~CT6,表面粗糙度一般為Ra0.8~3.2μm。
3)壓鑄件中可嵌鑄零件,既節省貴重材料和機加工工時,也替代了部件的裝配過程,可以省去裝配工序,簡化制造工藝。
2、壓力鑄造的缺點
1)壓鑄時液體金屬充填速度高,型腔內氣體難以完全排除,鑄件易出現氣孔和裂紋及氧化災雜物等缺陷,壓鑄件通常不能進行熱處理。

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