Method and apparatus for producing forked roots of turbine blades
AssigneeWalter AG
InventorMarkus Wetli
Life of this patent
Estimating the term…
Abstract
For producing forked roots of turbine blades, the turbine blades are, in a first step, roughed-in and smoothed (finished) on their outer faces in a single operation with two rigidly coupled disk milling cutters that are provided hard metal cutter inserts. In a second step, the forked root is formed with fingers by a set of rigidly coupled disk milling cutters that are provided with hard metal cutter inserts. The disk milling cutters form slots in the forked root. All of the slots are simultaneously opened (roughed-in) and smoothed (finished), the slots having parallel walls.
Claims21
A method of milling a plurality of parallel walls in a workpiece, the method utilizing a milling tool having a plurality of disk milling cutters disposed on a common shaft, each disk milling cutter including a plurality of circumferentially spaced hard-metal cutter inserts that form cutter edges, the method comprising the steps of:
- A) rotating the tool about an axis of rotation;
- B) producing, during step A, relative movement between the workpiece and the tool in a feed direction to bring the disk milling cutters simultaneously into contact with the workpiece;
- and
- C) continuing the relative movement of step B wherein the disk milling cutters simultaneously cut respective slots in the workpiece, with first cutter edge portions thereof performing a roughing cut, and second cutter edge portions thereof simultaneously performing a finishing cut, to form each slot with parallel walls.
A method of milling a plurality of parallel walls in a forked root of a turbine blade, the method utilizing a milling tool having a plurality of disk milling cutters disposed on a common shaft, each disk milling cutter including a plurality of circumferentially spaced hard-metal cutter inserts that form cutter edges, the method comprising the steps of:
- A) rotating the tool about an axis of rotation;
- B) producing, during step A, relative movement between the forked root and the tool in a feed direction to bring the disk milling cutters simultaneously into contact with the forked root;
- and
- C) continuing the relative movement of step B wherein the disk milling cutters simultaneously cut respective slots in the forked root, with first cutter edge portions thereof performing a roughing cut, and second cutter edge portions thereof simultaneously performing a finishing cut, to form each slot with parallel walls.
A milling tool for milling a plurality of parallel walls in a workpiece comprising a plurality of disk milling cutters rotatable about a common axis;
- each disk milling cutter including a plurality of hard metal cutter inserts arranged in circumferentially spaced relationship, each insert defining a rough-cutting circumferential cutter edge portion and a finish-cutting cutter axial edge portion, wherein the disk milling cutters simultaneously perform roughing and finishing cuts.
Dependencies are inferred from the claim text.