薄壁件反重力铸造的充型特点和浇注系统设计

Filling Characteristics and Running System Design of Counter Cast Thin-Wall Castings

充型过程的控制是能否获得优质薄壁复杂铸件的技术关键之一［１－２］。加压速度和充型速度是反重力过程的重要工艺参数，必须根据铸件的复杂程度、壁厚、铸型冷却条件、合金类型、浇注温度等合理选择和控制充型速度和加压速度［３－４］。本文通过水力模拟实验，研究了板类薄壁铸件充型特点和铸件壁厚、内浇口形状、个数等对临界充型速度和临界加压速度的影响规律，深化了对薄壁件反重力充型特点的认识，有助于指导实际生产和开发可调压的反重力铸造方法。

Controlling of the filling process is of the key factors in successful production of high quality shapedthin-wall castings[1-2].Pressure increase rate and filling velocity are essential controll parameters in counter-gravityfilling casting process. These parameters are closed related to the following factors,shape and thickness of thecasting,heat capacity or cooling ability of the mold,alloy composition and casting temperature[3-5]. The criticalfilling rate and critical pressure increase rate have been studied by hydrolic simulation methed. The results obtainedcould be very useful in developing and utilization of adjustable pressure counter-gravity casting process.