利用负压消失模工艺生产机架铸件

介绍了机架铸件的铸件结构及技术要求,详细阐述了其工艺设计:采用底注、开放式浇注系统,浇口比为ΣF直:ΣF横:ΣF内=1:1.32:2,其中,直浇道截面尺寸为φ90 mm,横浇道截面尺寸为60 mm×70 mm,共2道,内浇道截面尺寸为25 mm×25 mm,共20道,在铸件关键部位设计一定数量尺寸为70 mm×70 mm的集渣包,浇注温度1 420±10℃,负压度0.4 MPa,保压时间15 min。为防止模样变形,采用竹木条拉筋粘接固定模样簇及消失模易变形的部位,通过设计使用一种中空芯铁填充物,有效降低该缺陷的发生几率。最终生产的铸件各项指标均符合技术要求,废品率由原来的80%降到20%以内,已达到批量生产状态。

Produce The Rack Casts by Using Negative Pressure Lost Foam Process

The casting structure and technical requirements of racks castings was introduced. Its process design was elaborated as follows：bottom gating open system was used. Gating ratios is ∑Fpouring：∑Frunner：∑Fflow=1：1.32：2. The dimensions of pouring gate, runner gate and flow gate is φ90 mm,60 mm×70 mm and 25 mm×25 mm,respectively. There are 2 pouring gates and runner gates and 20 flow gates. Slag straps in a size of 70 mm×70 mm were used on key position of casting. The pouring temperature was 1 420±10 ℃. The negative pressure is 0.4 MPa and holding for 15 rain. Bamboo Wooden bar reinforcement was adhesively fixed on clusters and easily deformable parts to prevent deformation. A kind of hollow iron fillings was designed to reduce the probability of this defect. As a resuh,the indicators of casting meet the technical requirements and rejection rate drops to less than 20% from 80%. It achieved to a mass production status.