关键词: 榫槽, 成型刀具, 型线, 磨削, 五轴磨床

Abstract: The position of the turbine disc connecting blade of the steam turbine is usually a mortise groove structure. For small dovetail type mortise groove,a molding tool is often used for one-time processing,which leads to low precision of machined parts,poor surface roughness and high tool cost. In order to solve the limitation of the present manufacturing process,a design idea of combined cutting tools was proposed. Firstly,according to the structural characteristics of dovetail type mortise groove,the tool shape line and size parameters of four knives were designed.The model was built by UG modeling software,and the finite element analysis was carried out by ANSYS software. Then the manufacturing process of the combination tool was developed,and the path planning and programming were carried out by NUMROTO tool programming software.Finally,the qualified combined tool was grinded on the SAACKE five-axis tool grinder. Through simulation and practical verification,this scheme is feasible.Compared with traditional machining methods,it has the advantages of high machining accuracy, low surface roughness,low cutting heat and low cost.

Key words: mortise groove, molding tool, shape line, grinding, five-axis grinding machine