公开(公告)号：US4416321A

公开(公告)日：1983-11-22

申请号：US280213

申请日：1981-07-06

Applicant: John Goddard ,  David Mills

Inventor： John Goddard ,  David Mills

IPC: B22C9/04 ,  B22D27/04 ,  B22D23/06

CPC classification number: B22C9/04 ,  B22D27/045

Abstract: In casting of hollow turbine blades problems arise with breakage or distortion of long thin cores for small diameter cooling passages, and also in maintaining cores accurately positioned for casting thin walled blades. The present invention provides a method of manufacture in which a pre-form of the blade, or other hollow article, is made in two parts and is accurately machined to define the required passage shapes or wall thicknesses in at least one of the parts, appropriate cores are made and the pre-form parts are assembled in a casting mould with the cores in position and heated to melt the preforms. Thus the cores are supported by solid material during the melting process. The melting can take place progressively in a uni-directional manner along the article so that only a narrow area of the article becomes melted at any time and the cores are supported in the melt from both ends. Thus columnar grained or single crystal articles can be made by this method. The method can also be used to produce blind-ended holes in a cast article.

Abstract translation: 在中空涡轮机叶片的铸造中，由于用于小直径冷却通道的长的细芯的断裂或变形以及用于铸造薄壁叶片的精确定位的芯子，存在问题。 本发明提供了一种制造方法，其中叶片或其它中空制品的预成型件制成两部分并且被精确加工以在至少一个部件中限定所需的通道形状或壁厚，适当的 制造芯部，并且将预成型部件组装在铸造模具中，使芯部在适当位置并被加热以熔化预制件。 因此，芯在熔化过程中由固体材料支撑。 熔化可以沿着制品以单向方式逐渐进行，使得只有制品的狭窄区域随时熔化并且芯部从两端支撑在熔体中。 因此，可以通过该方法制造柱状晶粒或单晶制品。 该方法也可用于在铸造制品中产生盲孔。