Re-constructable formed milling cutter for fine machining of circular-arc-shaped curved mortise of wheel disc

Abstract

The invention discloses a re-constructable formed milling cutter for fine machining of a circular-arc-shaped curved mortise of a wheel disc. The re-constructable formed milling cutter comprises a cutter handle part and a cutting part, wherein the cutting part is provided with four spiral-groove cutting edges; each spiral-groove cutting edge is orderly divided into four working sections from the tool nose of the cutting part to the cutter handle part, and six separated blades are detachably fixed to the four working sections; the outer edge of each separated blade is coincident with the outer contour profile of the spiral-groove cutting edge and matched with the spiral-groove cutting edge in shape; and differentiated coatings with gradually-improved performance are orderly applied from the tool nose to the cutter handle part; an internal cooling channel penetrating through the cutter handle part and the cutting part is formed inside the formed milling cutter; and a cutting fluid outlet communicated with the internal cooling channel is formed in the vicinity of each separated blade. The formed milling cutter disclosed by the invention is re-constructable and convenient for replacing the worn and disabled blade, therefore, the uniformity and consistency of the cutting performance of the cutter are realized, the abrasion of the cutter is slowed down, and the production cost is reduced. The re-constructable formed milling cutter is suitable for forming fine machining of the circular-arc-shaped curved mortise of the wheel disc of a low-pressure rotor in a 1200 MW steam turbine in a third-generation nuclear-power CI (conventional island) unit.

Description

technical field [0001] The invention relates to a cutting tool, in particular to a reconfigurable shaped milling cutter used for finishing arc-curve tenon and groove of a low-pressure rotor disk of a steam turbine unit, and belongs to the technical field of mechanical manufacturing. Background technique [0002] The third-generation nuclear power equipment is the mainstream trend of the current power industry development, and its 1200MW conventional island steam turbine unit is currently the largest configuration in the steam turbine industry. The tenon and groove of the low-pressure rotor disk of the steam turbine is an arc-shaped tenon and groove, and its manufacturing technology is not yet mature, and the forming tool used for processing has always been the bottleneck in production. At present, the widest part of the arc curve tongue and groove of the 1200MW steam turbine low-pressure rotor disk reaches 91mm. The cutting process is faced with the problems of difficult to ...

AI Technical Summary

Problems solved by technology

However, if the finishing tool still uses the traditional integral form milling cutter for tenon and groove milling, there will inevitably be a disadvantage of high cost caused by uneven wear and tear in the process of tool overall repair or replacement.

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