Machining process of axial-flow type turbine blade

Abstract

The invention discloses a machining process of an axial-flow type turbine blade. The machining process of the axial-flow type turbine blade comprises the following steps that two side faces are machined on a square blank stock through an end face end mill on an ordinary milling machine through two process of rough milling and finish milling, another two side faces are machined with the two machined side faces as base planes, and then the two end faces are machined through the end face end mill; a steam outlet side face is machined on one side face through two process of rough milling and finish milling, the position, close to the steam outlet side face, of the blade root end face is marked as C, a face which forms an acute angle with the steam outlet side face and is adjacent to the steam outlet side face is marked as N and is the inner radial surface, and the other three side faces are machined to be a parallelogram through rough milling and finish milling; central holes are drilled in the blade root end face and the blade crown end face; the blade type is roughly milled through the end face end mill, the blade root is roughly milled, and finally the blade crown is roughly milled; then the blade is installed on a five-axis numerical control machining center for alignment and is machined in a finish mode; a process head at the blade root end face is roughly sawn through a sawing machine; the turbine blade is detected according to the requirements of a drawing.

Description

technical field [0001] The invention relates to a steam turbine blade, in particular to a processing technology for an axial flow steam turbine blade. Background technique [0002] At present, the structure of the blade at home and abroad mainly includes three parts: the blade root, the blade shape and the blade crown. The blade shape is generally located between the blade root and the blade crown. For this kind of steam turbine blade, it belongs to the moving blade. In the steam turbine, it rotates with the rotor at high speed. The blade is the energy conversion between the air flow and the rotor through the high-speed rotation of the blade. It carries a large mass inertia force, a large aerodynamic force and vibration load, so the blade plays a vital role in the entire steam turbine. Therefore, there must be a corresponding accuracy guarantee for the size of the blade, but the current existing processing technology is relatively backward, the product quality is unstable, t...

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Problems solved by technology

[0002] At present, the structure of the blade at home and abroad mainly includes three parts: the blade root, the blade shape and the blade crown. The blade shape is generally located between the blade root and the blade crown. For this kind of steam turbine blade, it belongs to the moving blade. In the steam turbine, it rotates with the rotor at high speed. The blade is the energy conversion between the air flow and the rotor through the high-speed rotation of the blade. It carries a large mass inertia force, a large aerodynamic force and vibration load, so the blade plays a vital role in the entire steam turbine. Therefore, there must be a corresponding accuracy guarantee for the size of the blade, but the current existing processing technology is relatively backward, the product quality is unstable, the processing method is unreasonable, and the production efficiency is poor.

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