A precision milling process for zero-position cutting of air passage profile line of compressor motor blade

Abstract

The invention discloses a zero-position cutting and finish-milling process for an air channel molded line of an air compressor moving blade and belongs to the technical field of blade machining. According to the finish-milling process, the air compressor moving blade, of which the air channel molded line is roughly machined, is clamped on a numerical control milling machine with a front-back double-drive structure through a double-drive frame clamp; the root end of the blade is positioned through a blade root end surface, a blade root air inlet side and a blade root intermediate internal plane and is pressed and clamped through a blade root intermediate back plane; the crown end of the blade is positioned through a process head air inlet side and a process head internal plane and is pressed and clamped through a process head back plane; in a spiral machining mode, the semi-finish-machining and finish-machining of a blade root longitudinal platform circular arc surface, a blade root fillet R surface and the air channel molded line are completed. According to the zero-position cutting and finish-milling process for the air channel molded line of the air compressor moving blade, the size of the product is machined to be in a tolerance range of a finished product during finish-milling machining, the extremely-small margin approximate to 0 is left for a polishing process, the machining accuracy of the air channel molded line of the blade is effectively improved, the requirement on high accuracy of the product is met, and meanwhile, the machining efficiency is ensured.

Description

technical field [0001] The invention relates to a blade processing technology, in particular to a zero-position cutting and fine milling technology for the air passage profile line of a compressor motor blade, and belongs to the technical field of blade processing technology. Background technique [0002] The air passage of the compressor motor blade is a variable cross-section profile. There are as many as 23 cross-sections within the air passage length range of about 50-350mm. The air inlet and outlet edges R range from R0.18mm to R0.3mm, and the air passage contour accuracy is ±0.1 mm, which is much higher than the accuracy of the airway profile of other blades. At the same time, the center of gravity of the airway relative to the center of the blade root is required to be ±0.1mm, and the bending of the airway allows the middle section to be less than 0.08mm per 25.4mm relative to the reference section at both ends. , the arc surface of the longitudinal platform of the ai...

AI Technical Summary

Problems solved by technology

[0003] In the milling process of the air channel profile of the blade, according to the traditional process route, on the basis of the theoretical design value plus the product air channel position degree and contour degree range in the process of fine milling process, the following polishing process is reserved. 0.1mm-0.2mm margin, so although the control of the milling process of fine milling has been greatly improved, it directly brings various difficulties to the subsequent polishing. During the polishing process, most of the dimensions need to be polished by hand Grinding, so the dimensional stability and accuracy of the compressor motor blades processed by traditional processing technology are not easy to guarantee

[0004] According to the principle of unification of benchmarks, the assembly and inspection benchmarks of compressor motor blades should be on the working surface of the blade root, and before the fine milling of the airway profile, the blade has completed the finishing of the blade root, including the end surface of the blade root, the blade root The finishing of the assembly surface, the intermediate body of the blade root, and the positioning surface of the blade root, so the first datum of the airway profile processing should also choose the assembly surface of the blade root, but since the assembly surface of the blade root is two and the center of the blade root When the workpiece is clamped, there must be a relatively large thrust acting on the end surface of the blade root to make the workpiece clamped firmly. However, the crown end chooses the method of top-tightening pinhole to realize the positioning and clamping of the blade crown. However, the thickness of the air passage of the compressor motor blade is very thin, and too much tightening force will cause the blade to be in the process of processing. The airway is processed to the finished product (thinning) and deformed, and the clamping force is too small, which will cause the workpiece to tremble during milling and dig the knife, resulting in the scrapping of the workpiece

[0005] To sum up, it is very difficult to process the airway profile of the compressor motor blade with the traditional clamping method and processing technology, and the processing accuracy, processing efficiency and yield cannot well meet the production requirements.

Images