A rough milling method for fir tree leaf root

A processing method, a fir-tree-shaped technology, is applied in the field of blade processing and steam turbine blade processing, and can solve the problems of high cost and low processing efficiency

Active Publication Date: 2015-09-09
WUXI TURBINE BLADE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the above problems, the present invention provides a method for rough milling of fir tree-shaped blade roots, which can solve the problems of low processing efficiency and high cost in existing rough milling methods

Method used

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  • A rough milling method for fir tree leaf root
  • A rough milling method for fir tree leaf root
  • A rough milling method for fir tree leaf root

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Embodiment Construction

[0025] A rough milling method for a fir tree-shaped blade root. Firstly, the machining coordinate system of a four-axis horizontal CNC milling machine is established as the auxiliary driving surface for machining. direction of drive plane 4, see Figure 6 , when the process requires machining the entire blade root, the continuous driving curved surface 5 containing the blade root is made, see Figure 7 ;The tool path of the bullnose end mill is a spiral continuous machining path, without empty tool stroke; the driving auxiliary surface is to create a mesh driving point array on the driving surface, and the driving points are projected to the fir tree leaf along the specified projection vector On the root, generate the machining trajectory of the tool; the driving surface can control the direction and projection vector of the tool, reduce the stroke of empty knife and tool lifting, shorten the machining trajectory of each knife as much as possible, and reduce the processing tim...

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Abstract

The invention provides a rough mill processing method of a fir tree blade root, and solves the problem that the existing rough mill processing method has low processing efficiency and high cost. The rough mill processing method comprises the following steps of: (1) establishing a processing coordinate system of a four-axis horizontal type numerical control milling machine, and processing a driving auxiliary surface; (2) calculating a processing path along contour of the blade root fir tree and the contour of a midbody, and milling a blade root processing step surface by using a bull nose circular knife end mill; (3) calculating the processing path of a deep groove in milling the contour of the fir tree, and processing the deep groove of the fir tree blade root on the basis of the blade root processing step surface by adopting a circular knife disc milling cutter; and (4) calculating a layered processing track of a forming tooth-type knife, and processing the teeth patterns of the fir tree blade root by using the forming tooth-type knife.

Description

technical field [0001] The invention relates to the technical field of blade processing, in particular to the technical field of steam turbine blade processing, in particular to a rough milling method for a fir tree-shaped blade root. Background technique [0002] The role of the blade root is to be used as the positioning base of the workpiece to closely fit with the groove of the main shaft wheel of the steam turbine. Most of the last stage blades are fastened by the fir tree-shaped blade root. The fir tree-shaped blade root has a strong bearing capacity and is easy to assemble and disassemble. Its shape is designed to be formed by connecting several curved surfaces with circular arc transitions between the curved surfaces. Machining requires an extremely precise process to ensure a very uniform load distribution on the teeth of the blade root and the fit of the blades and grooves on all steam turbine rotors to achieve full interchangeability. [0003] The rough milling p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23C3/00
Inventor 杨敏杨兆军
Owner WUXI TURBINE BLADE
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