油底壳铸件压铸工艺改进.pdf

Vol. 63 No 9
FOUNDRY
油底壳铸件压铸工艺改进
郭凌2,李建超,景风霞3
(1.内蒙古科技大学材治学院,内蒙古包头014030;2.包头职业技术学院材料成型技术系,内蒙古包头014030
3.内蒙古北方重エ业集团有限公司,内蒙古包头014030)
摘要:铝合金油底壳压铸件结构复杂,压铸成形和工艺难度较大。针对试生产的油底売铸件出现的冷隔和气孔缺
陷,进行了模流分析,进一步确定了缺陷特征和位置,并进行了工艺改进。通过改进浇注、溢流和排气系统解决了
冷隔问题,通过表面开槽技术消除了气孔缺陷,有效地解决了压铸缺陷,生产出了合格的油底壳压铸件。
关键词:油底壳;模流分析;压铸缺陷;工艺改进
中图分类号:TG249.9;TG146.2文献标识码:A文章编号:1001-4977(2014)09-0900-03
Improvement on the Die-casting Technology of Oil Pan
GUO Ling, LI Jian-chao JING Feng xia
(1. School of Material and Metallurgy, Inner Mongolia University of Science and Technology, Baotou 014010, inner
Mongolia, China 2. Material Formin Technology Depar men, Baotou Vocational and Technical College, Baotou 014030, Inner
Mongolia, China; 3. Inner Mongolia North Heavy Industries Group Co, Ltd, Baotou 014030, Inner Mongolia, China)
Abstract: Aluminum alloy oil pan was complex, the die-casting molding and processing of casting is difficult.
Cold insulation and porosity defects were found by trial production of the oil pan. So the mold flow analysis was
adopted to determine the defect characteristics and position further. Then the technology was improved. The
cold insulation problem was solved by perfecting pouring overflow and exhaust system. The porosities were
eliminated by notch on the surface. It showed that technology improvement scheme was reasonable, the
die-casting defects were effectively solved and qualified oil pan die casting was produced.
Key words: oil pan; mold flow analysis; die-casting defects; technology improvement
油底壳又称下曲轴箱,是汽车发动机上最主要的该侧设置内浇口。对面末端位置设置多处溢流集渣排
零部件之一,密封性要求高,其主要功能是存储机油气通道,右侧设置一处溢流集渣排气通道,因左边有
并封闭曲轴箱,一般采用薄钢板冲压而成。为了能够滑块,适当增大左上位置的溢流、集渣包尺寸。初步
让油底壳内的机油更好散热,目前许多发动机采用了设计方案如图1。
铝合金铸造材质的油底壳,并且底部铸有相应的散热
片。但是,由于结构复杂,壁厚变化大,油底壳铸件
的压铸成形工艺难度较大。本工艺改进试验,主要针
对原工艺生产中出现的冷隔和气孔缺陷,进行了分析
和改进,并应用改进的丁艺生产出了合格压铸件。
1油底売压铸技术条件及原工艺方案
本油底壳采用铝合金ADC12压铸工艺生产,轮廓
尺寸393mmx250mmx129mn,最小壁厚3.5mm,毛
坯质量3.8kg,要求内腔在0.1MPa的空气压力下无泄
露,油道在0.3MPa的空气压力下无泄露。铸件投影面
积870cm2,经锁模力核算选用DCC1250压铸机,10
mm冲头直径。浇注系统采用梳形设计,多个内浇口充
填。ADC12的流动性较好,浇注温度630~660℃。由
图1原工艺方案
于油道气密性要求高,滤油器端面不允许有气孔,在
Fig. I The original die casting processing plan
收稿日期:2014-03-10收到初稿,2014-05-07收到修订稿。
作者简介:郭凌(1973-),女,研究生,高工副教授,主要从事铸造工艺设计及模拟研究。E-mail:guozm(@163.com