Rough milling cutter for rotor and wheel groove of steam turbine and manufacturing technology of rough milling cutter

Abstract

The invention provides a rough milling cutter for the rotor and the wheel groove of a steam turbine and a manufacturing technology of the rough milling cutter. The milling cutter comprises blade parts adopting an integral structure and a shank part, wherein a plurality of cutting edges arranged along spiral lines are uniformly distributed on the blade parts in the circumferential direction; the blade parts are axially and hierarchically arranged at three stages along the milling cutter; cutting edges comprise main blades and auxiliary blades, which are distributed in a staggered manner; the main blades are whole blades penetrating through a first-stage part and a second-stage part, and adopt the structure of a postwave blade with sharp teeth, which are used for opening chip-separation grooves; the first-stage part of the auxiliary blades is a boss, the height of which is lower than that of the first-stage part of the main blades; the second-stage part of the auxiliary blades adopts the structure of a clearance angle with sharp teeth, which are not used for opening chip-separation grooves; the third-stage part of the blade parts is a coping part. The rough milling cutter has the advantages that the defects that the removing amount of metal is large, the cutting stroke is long, and the tipping is easy to occur in positions with major diameters are overcome, the security and reliability of the cutter are enhanced, so that the milling cutter has a stable machining process, high efficiency and excellent anti-tipping performance, and is suitable for roughly opening various V-shaped grooves, the repeated utilization rate of the cutter is high, the cutter can be reused through coping for 3 to 5 times, and the cost of cutter is reduced.

Description

technical field [0001] The invention relates to the technical field of metal cutting tools, in particular to a steam turbine rotor wheel groove rough milling cutter with excellent chipping resistance and a manufacturing process thereof. Background technique [0002] Traditional steam turbine rotor groove machining is generally divided into three steps: rough machining (V-shaped rough milling cutter, also known as wave-edged taper milling cutter), semi-finishing (Christmas tree semi-finishing milling cutter) and finishing (Christmas tree finishing milling cutter). Among them, rough machining has the largest cutting allowance, accounting for more than 80% of the machining allowance of the wheel groove, and is a key step to determine the processing efficiency. The back wave edge taper milling cutter is widely used in machinery, aviation and shipbuilding and other equipment industries. Manufacturing the There are two main types of tool materials for milling cutters: high-speed s...

AI Technical Summary

Problems solved by technology

However, due to the geometric parameters, structure and processing technology of the cemented carbide milling cutter manufactured by the existing technology, the cutter is prone to chipping during use, resulting in low tool durability, and its safety and reliability are obviously inferior to high-speed steel milling cutters.

These problems seriously restrict the machining efficiency of the rotor groove, affect the safety of the machining process, and also limit the wide application of this type of milling cutter

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