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                        東莞市大班金屬制品有限公司
                        專注鋁合金重力鑄造
                        專業: 汽摩配件
                            泵體耐壓件
                            大型機械件
                            幕墻結構件
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                        鋁合金重力澆鑄與鋁合金重力鑄造的區別

                        信息來源于:互聯網 發布于:2022-04-13

                          鋁合金重力鑄造廣義上是指液態鋁合金在重力(地球引力)的作用下完全充型并凝固成形的方法,包括砂鑄,金屬型鑄造,熔模鑄造,石膏型鑄造等。狹義上是特指金屬型澆鑄,也就是將液態鋁合金澆入鋼制的模具中,冷卻成型后取出的鋁合金鑄造工藝方法,所以也叫重力澆鑄,或是鋼模鑄造,鋼模澆鑄。
                          這種工藝方法生產的產品尺寸精度高,外表美觀,致密性好,強度高,特別是可以作T6熱處理,使得鋁鑄件具有高的強度,硬度,延伸率,用在一些機械性能要求高的應用中,例如航空,汽車,鐵路,醫療等。汽車的鋁車輪轂就是一個典型的應用,好多朋友認為是用壓鑄作的,這個真不是,全世界的鋁車輪轂都是用重力鑄造或是低壓鑄造作的,不能用壓鑄作,壓鑄作的鋁鑄件內部充斥大量的氣體,形成大量的小氣泡,一方面降低了機械性能,另一方面因為氣泡的存在導致不能作T6熱處理,也無法進一步提高機械性能。并且鋁合金壓鑄工藝生產的鋁合金成分中需要含有高的鐵含量,而鐵的含量多少決定了鑄鋁件的延伸率,鐵含量高則鑄鋁件延伸率低,也就是我們常說的脆,耐沖擊性差,所以象鋁車輪轂這種需要高強度,高安全性,耐沖擊的鋁合金鑄件是不能用鋁合金壓鑄工藝生產的。
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