Analysis of the machining technology of the fir tree blade root milling cutter of the steam turbine

doi:10.16731/j.cnki.1671-3133.2024.11.001

Abstract

Abstract: Fir tree blade root milling cutter is an important tool for processing blade roots and hubs in the steam turbine industry.Due to its complex cross-sectional shape,the traditional machining technology has the shortcomings of complex process,low efficiency and difficult to guarantee accuracy. In order to solve the process problems above,a process strategy for roughing of five-axis turning and milling compound machining center and finishing of five-axis tool grinder was proposed. Firstly,taking a fir tree-shaped blade root milling cutter as an example,the structural characteristics of the five-axis turning and milling compound machining center were determined,and the process route of the five-axis turning and milling compound machining center roughing and the finishing of the five-axis tool grinder was determined,and the process technical documents were compiled respectively. Secondly,ESPRIT TNG turning and milling composite programming software was used to compile the roughing toolpath trajectory,and NUMROTO software was used to compile the finishing toolpath trajectory. Finally,the toolpath trajectory was converted into numerical control code for simulation processing,and the simulated numerical control code and grinding code were imported into the five-axis turning and milling compound machining center and the five-axis tool grinder to complete the practical processing. By testing the tool profile,angle and appearance of the finished machined tool,all technical indicators meet the design requirements,and the processing efficiency increased about 24.4 %,which verified the effectiveness of the process scheme.

Key words: fir tree type, five-axis tool grinder, grinding, blade root cutter

CLC Number:

TG723

ZHANG Jian, TANG Qingchun, CHEN Hanyang, ZHOU Lean. Analysis of the machining technology of the fir tree blade root milling cutter of the steam turbine[J]. Modern Manufacturing Engineering, 2024, 530(11): 1-9.

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