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铸造铝硅合金真空密封造型工艺难点分析 总被引:1,自引:0,他引:1
林红旗 《特种铸造及有色合金》2009,29(2)
根据真空密封造型工艺和铸造铝硅合金性能特点,分析了真空密封造型用于铝硅合金铸造的难点,主要是铝硅合金容易吸气、氧化,氢在铝液、固态中溶解度差值大,真空密封造型散热慢,铝硅合金的凝固收缩大等.通过妥善保管原材料,做好熔炼前准备;快速熔炼,降低浇注温度,缩短浇注时间;提高冷却速度,增加型腔排气;充分精炼;采用倾转浇注工艺等,问题得到较好解决.经对大型高压开关铝硅合金铸件的生产验证,取得良好的效果. 相似文献
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一种钢壳铝芯铸件(见图1),其铝钢异种材料复合结构具有铝的良好导电、导热性能和钢的强度性能,能够在较高温度和导电工作条件下正常使用.通常的铸造方法是将铝液浇注进入钢壳体内冷却后获得钢壳铝芯结构的铸件,由于铝液凝固与冷却收缩,铝芯与钢壳之间必然产生缝隙,因而极大地影响该构件的导电性能.…… 相似文献
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宋遵奎 《中国铸造装备与技术》1992,(5)
位于日本静岗县滨松市的普拉斯电机制作所,近年研制成功了用电子计算机控制的能对多种金属进行浇注、操作简单的PR4C-B-1型浇注机器人,并已开始销售。该种机器人是1988年开发的PR4C型机器人的改进型,其主要改进如下: a.浇注勺内的铝液重量,由传感器自动计量,能对大小不同数个金属型正确地进行浇注。不仅能进行等量浇注,也可不等量浇注。 b.为了防止浇注时从浇注口溢出金属液 相似文献
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对铝合金缸盖的针孔和气密漏缺陷进行了分析.铝液吸氢是产生针孔的主要原因,可以通过对铝液进行精炼除气,并合理选择浇注参数和严格控制浇注过程来抑制针孔缺陷;发动机缸盖气密漏是由水套砂芯发气量过大造成的,提出了降低砂芯自身发气量和加强浇注模具排气能力的控制措施. 相似文献
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施鸿源 《中国铸造装备与技术》1981,(2)
近年来,电磁泵在国外日益发展而应用于铝铸件的各种浇注,如金属型或砂型的低压闭型底注以及准确定量重力浇注等。这种浇注具有如下特点: ①电磁泵从液面以下抽吸铝液进行浇注,这样可以防止浮渣和氧化物带进铝液,并且可以防止液面受到搅动,从而减少铝液的氧化损耗。 相似文献
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铝合金副车架前铸铝支座属于薄壁类铸件,为了更好地保证产品质量,确保铸件外观、性能均符合技术要求,本文从铸件结构特性、铸造热节、浇注方案、工艺参数等方面进行工艺研究分析。实践结果表明,通过对前铸铝支座的结构特性分析,利用砂芯成型铸件局部内凹结构,增设网格改善铝液充型能力、增强产品热节部位补缩效果,增加风冷进行局部冷却、优化浇注系统、优化顶杆排布等方法可以很好地提高铝液充型能力、改善铸件局部过热、实现顺序凝固、避免打料变形等问题,极大程度地解决了前铸铝支座铸造缺陷,提高了铸件成品率。 相似文献
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Gating system optimization of low pressure casting A356 aluminum alloy intake manifold based on numerical simulation 总被引:1,自引:0,他引:1
To eliminate the shrinkage porosity in low pressure casting of an A356 aluminum alloy intake manifold casting, numerical simulation on filling and solidification processes of the casting was carried out using the ProCAST software. The gating system of the casting is optimized according to the simulation results. Results show that when the gating system consists of only one sprue, the filling of the molten metal is not stable; and the casting does not follow the sequence solidification, and many shrinkage porosities are observed through the casting. After the gating system is improved by adding one runner and two in-gates, the filling time is prolonged from 4.0 s to 4.5 s, the filling of molten metal becomes stable, but this casting does not follow the sequence solidification either. Some shrinkage porosity is also observed in the hot spots of the casting. When the gating system was further improved by adding risers and chill to the hot spots of the casting, the shrinkage porosity defects were eliminated completely. Finally, by using the optimized gating system the A356 aluminum alloy intake manifold casting with integrated shape and smooth surface as well as dense microstructure was successfully produced. 相似文献
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对低压铸造铝合金车轮模具的水冷效果进行了测试,对比了风冷工艺与水冷工艺对铸件各部位材料性能和金相组织的影响。由水冷工艺的模具温度梯度变化,得到了提高铸件质量和生产效率的相关数据,为铝车轮低压铸造水冷却工艺的应用提供了基础技术积累。 相似文献
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简述了电解原铝液生产重熔用铝锭过程中铸造损失的构成,通过降低高温原铝液发生氧化反应的几率,并对铝灰渣采取有效的分离措施,以及对生产过程实施精细化管理以减少废品回炉,从而有效降低铸造损失率.经实际生产验证,采取控制措施后,企业的铸造损失率明显下降,降低成本效果显著. 相似文献
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Central region coarse grains and centerline segregation are common defects in aluminum ingots fabricated by direct chill(DC)casting.A double cooling field was introduced into the DC casting process to reduce these defects,whereby the external cooling was supplied by the mold and water jets,and intercooling was achieved by inserting a rod of the same alloy into the molten pool along the central axis of the ingot.Rather than forming a good metallurgical interface during solid-liquid compound casting,in the present work,the purpose of inserting the rod is to enforce internal cooling and consequently decrease the sump depth.Moreover,the insertion provides more nucleation sites with the unmoltenα-Al particles.The structure and the macrosegregation of 2024 Al alloy ingots prepared by DC casting with and without the inserts were investigated.Results show that when the inserting position is 50 mm above the upper edge of the graphite ring,significant grain refinement in the central region of the ingot and a reduced centerline segregation are achieved. 相似文献