共查询到20条相似文献,搜索用时 289 毫秒
1.
《铸造》1983,(6)
1.精密铸造模料显微组织初探陈冰 北京航空学院一系铸造组2.熔模精铸ZG3Crl3叶轮裂纹产生原因及其防止方法郑传耀 南京化学工业公司化工机械厂3.论提高熔模铸件的表面光洁度朱承兴等 北京航空学院一系铸造组4.一种简便的耐火粉料粒度分析法李海志等 北京航空学院一系铸造组5.高速生产优质精铸件的新工艺一电泳制壳工艺电泳制壳组 洛阳农机学院6.①硅酸乙酯40的工艺性能及其应用②熔模铸造用硅酸乙酯的研究(合并为一篇)张家骏等 清华大学7.精铸件表面裂纹的特征和消除熊才钰等 长春1017信箱15分箱8.双锋颗粒级配精铸石英粉的研究包彦堃等 浙江大学9.精铸用石英粉粒度分析方法的研究王慕荣 浙江大学 相似文献
2.
3.
研究粉料的粒度分布对TiAl合金熔模精密铸造用氧化锆陶瓷性能的影响。对粉料粒度分布、粉末形貌、浆料黏度、型壳抗弯强度和断裂形貌之间的关系进行研究;通过测量氧化锆粉末和粘结剂构成的浆料的黏度来考察粉末粒度分布对浆料黏的影响;对不同粒度分布氧化锆陶瓷型壳断口形貌进行观察。结果表明:粉料粒度分布对未焙烧和焙烧后氧化锆陶瓷型壳的强度影响行为相似;粉料粒度分布对氧化锆陶瓷型壳的质量能产生很大的影响并进而影响到熔模精密铸造制备TiAl合金构件的质量。 相似文献
4.
消失模精密铸造工艺研究 总被引:6,自引:3,他引:6
借助熔模铸造制壳工艺制成消失模铸造用的超薄空腔型壳,以减少消失模铸造在浇注过程中因聚苯乙烯气化而产生的铸件增碳、增氢等缺陷。聚苯乙烯模失模工艺为随炉升温至600℃,保温60min,型壳焙烧工艺为800℃焙烧1h。 相似文献
5.
6.
7.
用硅溶胶铝矾土涂料和莫来石、煤矸石砂等,在密度为0.05~0.08g/cm~3的气化模上制备型壳,干燥后,在不同温度下进行型壳的失模试验.结果表明,在300~1000℃范围内失模时,型壳大量开裂,在100~300℃范围内失模时,型壳不开裂.通过对气化模温度一尺寸特性及型壳失水收缩过程分析发现,高温下型壳的开裂是因其失水收缩严重受阻所致;最佳失模温度为160~200℃. 相似文献
8.
分析了蜡模工作室温度、壳型材料、涂料和金属的浇注温度等对熔模铸件完整性的影响,研究了壳型材料的膨胀特性,涂料的粘度、耐火粉料的粒度和搅拌时间与表面粗糙度的关系,探讨了控制高精度铸造叶片尺寸和表面粗糙度的方法. 相似文献
9.
精密金属加工公司(PMI)的总部在美国俄亥俄州的克利夫兰,发展了一种程序化的自动制壳系统,用于失蜡铸造。500型的 ABU 系统可以在 Shellvest 系统(PMI 专有的方法)中自动地涂敷陶瓷浆和耐火粉料。Shellvest 系统是先用一个份量轻的可重复使用的心棒——或简称为鼓简。在蜡模焊上之前鼓筒先已制 相似文献
10.
传统精密铸造生产工艺存在诸多问题,采用快速成型加精密铸造能有效解决部分问题并提升铸造技术。利用光固化快速成型制造出高精度模样,可以代替熔模铸造中的蜡模。在模样上涂挂耐火型壳,高温焙烧使树脂模样燃烧去除,最后造型浇注,可以实现缩短生产周期和降低成本的目的。以涡轮叶片为例,将快速成型与精密铸造相结合,形成快速精密铸造加工工艺:采用SPS600快速成型机制造出涡轮叶片的树脂模样;依靠模样形成耐火型壳中型腔的模型;最后采用熔模铸造法浇注出金属型叶片。 相似文献
11.
12.
13.
14.
15.
P. Dunne S. P. Soe G. Byrne A. Venus A. R. Wheatley 《Journal of Materials Processing Technology》2004,150(3):201-207
Injection moulded components are finding vigorously increasing applications in numerous sectors. The flexibility of the process allows complex components to be manufactured in high volumes in fully automated environments. Associated with such components are equally complex tools whose manufacture is both expensive and time consuming. It is therefore vital that the component design be evaluated thoroughly with regard to both performance and manufacturability before commitment is made to expensive production tooling. The use of a physical prototype often provides the best method of design evaluation. The major routes to prototype manufacture are; material removal, rapid prototyping and rapid tooling. Rapid tooling techniques provide the most representative route, with the ability to produce polymeric prototypes (often in final material) by an injection moulding process.
Research has been undertaken into two rapid tooling processes; enhanced silicone moulding and sand moulding. Both processes involve casting material against a rapid prototype (master pattern) to form a mould which is then used in the manufacture of product prototypes by injection moulding. The focus of this paper is on the demands of these tooling techniques placed on rapid prototypes when used as master patterns. The demands are discussed in terms of surface finish, surface porosity, dimensional accuracy, thermal resistance and thermal expansion. 相似文献
16.
A benchmark procedure has been designed to assess the dimensional as well as the geometric accuracy of currently one of the most widely used rapid prototyping processes - the Three Dimensional Printing. It tests not only linear accuracy but also precision, and repeatability of the process, as well as its ability to create manufacturing features such as fillets and draft angles. The presented research results reflect the necessity to adequately respond to engineering requirements for clearly meeting dimensional and geometric tolerances and root on several in-house case studies proving the comparison with established high-end RP processes. 相似文献
17.
18.
19.
本文首先介绍了本次实验所采用的选择性激光烧结方法的原理,在此基础上,详细介绍了覆膜金属粉末的制备,并对金属注塑模具快速成型工艺及后处理实验技术进行了研究。 相似文献