A machining method for the guide vane hole of the guide vane outer ring of a tubular water turbine

Abstract

The invention discloses a method for processing the guide vane hole of the outer ring of the guide vane of a tubular water turbine. The center cross line and the guide vane hole processing line are drawn after the pin hole is divided into half surface technology and the rough turning is processed, and the method is performed on a double-column numerical control vertical lathe. Install the pressure tool to connect the outer ring of the guide vane, and install the universal milling head. Through the lathe faceplate indexing, the guide vane holes are roughly and obliquely bored in sequence, and then the flanges at the guide vane holes of the guide vane outer ring are welded, and finally the eccentric pin hole structure is positioned. , redraw the guide vane hole lines after finishing, use tooling tools for positioning and leveling, and use the universal milling head of the CNC floor boring machine to control the indexing rotation of the center of the boring machine table through the numerical control program to process the guide vane holes in sequence . The invention has the advantages of simple process, convenient operation and low cost. It can not only improve the processing efficiency, but also have accurate graduation and high positioning accuracy, so that the processing size, shape and position tolerance accuracy and roughness of the guide vane hole of the guide vane outer ring can be improved. The degree can meet the design requirements and improve the quality of the product.

Description

technical field [0001] The invention relates to a method for processing guide vane holes, in particular to a method for processing guide vane holes on the outer ring of guide vanes of a tubular water turbine. Background technique [0002] At present, the guide vane outer ring of the tubular turbine is the core component of the turbine, and the conventional processing method for the guide vane holes at the inner arc flow channel on the guide vane outer ring is to fix and connect the guide vane outer ring into one body through a tooling turntable tool , and form the 30° included angle required by the design drawings, so that the processing of the guide vane hole can be adjusted to the horizontal direction, and then the boring bar can be processed along the horizontal direction through the ordinary floor type boring machine, and then through the rotation on the tooling turntable The rotation of the indexing plate realizes the processing of all the guide vane holes one by one. T...

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Problems solved by technology

[0002] At present, the guide vane outer ring of the tubular turbine is the core component of the turbine, and the conventional processing method for the guide vane holes at the inner arc flow channel on the guide vane outer ring is to fix and connect the guide vane outer ring into one body through a tooling turntable tool , and form the 30° included angle required by the design drawings, so that the processing of the guide vane hole can be adjusted to the horizontal direction, and then the boring bar can be processed along the horizontal direction through the ordinary floor type boring machine, and then through the rotation on the tooling turntable The rotation of the indexing plate realizes the processing of all the guide vane holes one by one. This processing method is not only inefficient, but also the tooling is quite cumbersome, and each guide vane hole needs to be rotated and indexed. It takes several people to work together to turn and process each guide vane hole in turn. The indexing of the blade hole is not accurate. At the same time, the positioning reference of the tool itself will cause the positioning accuracy error of the tooling with the long-term use of the product. Therefore, the machining size, shape tolerance accuracy and roughness of the guide vane outer ring guide vane hole cannot meet the design requirements.

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