A SINGLE LAYOUT HOLDING METHOD FOR 5-AXIS MULTI-PATCH SCOOP MILLING OF STEAM TURBINE STATIONARY BLADED RINGS FROM A SINGLE FORGING

摘要

The invention relates to the special job holding fixture and methodology used for the multi-patch 5-Axis scoop milling of the Stationary Bladed Rings of the Super Critical Steam Turbines from a single forged blank on the suitable 5-Axis machine tool with rotary indexing table with both sides tilting head configuration. The bladed ring (5) consisting of 32 nos. of blades (6) integrally is machined from a single forged blank (7). In a single layout the forged blank (7) is held with the help of holding plate (8) with two locating pins (14). A fixture plate (4) is mounted on to a face plate (3) of a rotary table (2) with the help of two locating pins (15). Bladed ring blank (7) is mounted on the fixture plate (4) for machining. A CNC program is generated with different cutting tools heads (12) covering rough semifinish and finish machining of bladed ring (5) in a single layout on the 5-Axis machine with rotary indexing table (2) and both sides tilting head (9).