Three-axis numerically-controlled milling machine milling method and device for semi-open type impeller of variable-cross-section twisted blades

Abstract

The invention discloses a three-axis numerically-controlled milling machine milling method and device for a semi-open type impeller of variable-cross-section twisted blades. The method comprises the following steps that 1, a three-dimensional model of the semi-open type impeller is made through software (Solidworks) and stored in the IGS format, and UG4.0 is introduced for programming; 2, machining before milling is conducted on a forge piece through a lathe; 3, the piece obtained through machining before milling is vertically placed on a milling machine workbench in the mode that the piece is axially parallel to the Z-axis direction of a milling machine and the shaft disc surface is upward and then unloaded after an equilateral polygon of which the edge number is equal to the number of the blades is milled, and a central spindle and a connecting disc are installed and then fixed after being leveled and aligned; 4, a first program and a second program are introduced for machining; 5, a blank obtained through the first program and the second program is fixed to an indexing disc through the connecting disc, leveling and aligning are conducted through an impeller chuck, the indexing disc and the equilateral polygon arranged on a shaft disc, and machining achieved through a third program is completed; 6, a reserved technological face of the shaft disc and the technological chuck are removed, and then impeller machining is completed. Compared with a method for machining the semi-open type impeller through a five-axis milling machine, the milling method has the advantages that the machining cost is greatly reduced while the machining precision is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of numerical control machining and manufacturing, and relates to a machining method and a machining device for mechanical parts, in particular to a method for machining a semi-open impeller with variable cross-section and twisted blades on an ordinary three-axis numerical control milling machine using special tooling and device. Background technique [0002] Semi-open ternary impeller, as a key power component in fluid machinery, is widely used in aviation, aerospace, energy, chemical and other fields. Its numerical control processing technology has always been an important topic in the machinery manufacturing industry. The semi-open three-way impeller is one of the main parts that work on the working medium in the turbo compressor. Most of them operate in high-temperature, high-pressure, and highly corrosive media. The material is mainly made of precipitation hardened stainless steel-FV520B (17 -4PH materi...

AI Technical Summary

Problems solved by technology

At present, semi-open impellers generally use the five-axis linkage layered milling flow channel processing method, but the five-axis linkage machining cost of the machine tool is large, the processing cycle is long, the efficiency is low, and the processing cost is high.

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