毕业论文支座铸造工艺设计.doc

毕业论文
毕业论文题目:支座铸造工艺设计
系部:材料工程系
专业: 材料成形于控制技术
班级:材料成形于控制技术
学生姓名:
指导教师:

支座铸造工艺设计
摘要: 本支座为一小型铸件,铸件材质 HT200,结构简单,无复杂的型腔和阻碍起模的凸起。铸件的外形尺寸为 200mm× 110mm× 120mm,主要壁厚为 15mm,壁厚均匀。支座采用 HT200 是一种较高强度铸铁,基体为珠光体,强度、耐磨性、耐热性均较好, 减振性也良好,铸造性能较好。从支座的整体结构特点出发,进行铸造工艺设计分析, 确定铸造方案,并进行铸造工艺参数和砂芯的设计,在此基础上再根据铸件的材质重量和浇注系统性能设计补缩系统。采用粘土砂手工造型、制芯、金属摸样和半封闭加注系统,设计时应综合考虑各方面因素,浇注系统不是简单地金属液流动通道,用 proe 三维造型后,采用华铸 CAE 软件对设计方案进行浇注、凝固模拟计算。结果显示,浇注系统设计合理,但凝固时铸件上表面有明显的缩孔缩松,经仔细观察此缩孔在铸件刚开始凝固时都已经产生,分析原因是因为铸件为湿型,开始凝固时吸收较多的热量,使上表面先凝固下沉,产生凹坑阻碍金属液补缩,为了避免此缺陷的产生减少热量散失浇筑前铸件进行预热,改进工艺后再次运用华铸 CAE 模拟铸件无明显缺陷。由于铸件模数较小 M=,HT200 凝固时伴随着石墨的析出与膨胀,铸件以层状-糊状方式凝固,其共晶膨胀压力小,加之石墨片尖端伸向铁液的生长方式,使其有很好的“自补”能力,需要的补缩金属液较少,件工艺出品率为 75%。
关键词:支座;工艺设计;华铸 CAE
Support casting process design
Abstract: This bearing is a small-sized castings, casting material HT200, structure is simple, plicated cavity and hinder the draw. The shape of the casting size for 200 mmx110mmx120mm, main wall thickness is 15 mm, wall thickness uniformity. Bearing adopts HT200 is a kind of high strength cast iron, for pearlite matrix, and the strength, abrasion resistance and heat resistance are good, vibration is also good; Casting performance is good. Starting from the overall structure of the bearing characteristics, analysis of casting process design, casting solution is determined, and the casting process parameters and the design of sand core, on this basis, according to the material weight of casting and pouring system and feeding system design performance. Using clay sand handmade molding and core making, metal touch kind and semi-closed charging system, gating system design should be considered when factors not simply metal fluid flow channels, after using proe 3 d modelling, the China casting CAE software is adopted to design plans for pouring and solidification simulation. , according to the results of gating system design is reasonable, but the casting surface has obvious shrinkage on the shrinkage, carefully observe the shrinkage in casting solid