A method for integral processing of the upper crown of the model runner and the curved surface of the discharge cone flow channel

Abstract

The purpose of the present invention is to provide a method for integrally processing the upper crown of the model runner and the curved surface of the discharge cone flow channel. The steps are as follows: except for the processing allowance reserved on the surface of the runner, the upper crown of the model runner and the water discharge cone parts are processed in place according to the requirements of the drawing. Install the upper crown, the coupling flange, the drain cone together with the expansion sleeve on the mandrel, and carry out the overall finishing machining on the surface of the runner. The new technology solves the problem that the shape accuracy and dimensional accuracy of the runner surface of the upper crown cannot be guaranteed due to the assembly error of the upper crown and the coupling flange and the machining deformation during the finishing of the upper crown. The connection of the water cone runner surface is not smooth and requires manual grinding, which not only ensures the accuracy requirements of the drawings, but also reduces the uncertainty caused by manual grinding, which has a huge advantage in improving product quality. The technical process of the invention is reasonable and rigorous, and has the characteristics of easy popularization, strong versatility and the like.

Description

technical field [0001] The invention relates to an integral processing method for the upper crown of a model runner and the curved surface of the discharge cone flow channel. Background technique [0002] During the research and development process of the turbine, the hydraulic model test of the turbine is an important means for the performance research, design, manufacture and operation of the turbine. In the past, the processing method of the model runner was that the upper crown, the coupling flange, and the discharge cone were all processed in one piece to meet the requirements of the drawing. , and then assembled by fitters, this processing method has three disadvantages: [0003] 1. The upper crown and the coupling flange are in a clearance fit. Due to the assembly error, there is a misalignment between the surface of the upper crown flow channel and the inner hole of the coupling flange. [0004] 2. A small amount of deformation will occur due to the influence of cla...

AI Technical Summary

Problems solved by technology

[0003] 1. The upper crown and the coupling flange are clearance fit. Due to the assembly error, there is a misalignment phenomenon between the surface of the upper crown flow channel and the inner hole of the coupling flange.

[0004] 2. When the crown is single-piece processed, it will produce a small amount of deformation due to the influence of the clamping force, which will affect the machining accuracy and shape tolerance of the crown runner surface

[0005] 3. The upper crown and the drain cone are affected by the dimensional tolerance zone, clamping deformation and the rounded corner of the tool tip during the single-piece processing. It is difficult to ensure the smooth connection of the flow channel surface after assembly. The shape and position accuracy and dimensional tolerance of the workpiece also reduce the work efficiency and product appearance quality

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