Processing and correcting tool of large-size stator odd-flap engine base joint close surface and processing method

Abstract

The invention relates to a processing and correcting tool of a large-size stator odd-flap engine base joint close surface and a processing method. The tool comprises a base (1) with an adjustment screw (7), a rotating flange (2) arranged on the base, an upright post (3) arranged in the rotating flange, a rectangular slide seat (5) and an angle ruler (6), wherein the rectangular slide seat (5) is arranged on the upright post, can vertically slide along the upright post and is provided with a leveling ruler (4) on the side face; and both right-angle sides of the angle ruler (6) are respectivelybutted against the leveling ruler and the slide seat. The processing method comprises the following steps of: placing an engine base flap (8) on an adjustable supporting device (9) on a rotary working-table; by using a joint close end face and an annular plane of the engine base flap as a reference, boring a joint close end face (8a) firstly; then correcting the engine base flap by using the correcting tool; and then boring another joint close end face (8b). In the invention, the correcting tool is skillfully applied, and the processing of the joint close surface of the odd-flap large-size stator engine base can be successfully finished once. The invention has the advantages of simple method and easy operation.

Description

technical field [0001] The invention belongs to the technical field of processing the seam surface of a large stator base. Background technique [0002] The stator frame is the key component of the hydro-generator. The diameter of the stator frame of the large and medium-sized hydro-generator is often greater than 5m, and some even exceed 20m. It is made by splitting the petals, and after arriving at the scene, they will be synthesized into a full circle through joint debate. Since the reluctance at the parting part of the machine base will increase, which will have a certain impact on the electromagnetic performance of the generator, the purchaser often requires that the machine base should be divided into the least number of lobes as far as possible under the premise of meeting the transportation conditions, so often There will be stator frames with an odd number of lobes. The processing of the seam surface of odd-numbered lobe bases is much more difficult than that of e...

AI Technical Summary

Problems solved by technology

Due to the fact that the joint surfaces at both ends of the odd-numbered lobe base will form a certain angle, just take a three-lobe base with a diameter of 7m as an example. Theoretically, the angle error must be less than 0°0'3" to meet the standard requirements. Considering the tightening force It will cause slight elastic deformation on the seam surface. In the process practice, the angle error is less than ±0°0'10" and the seam can meet the standard requirements. It is the angle error of this ten seconds, which is very important for machining super large diameter workpieces. very difficult

Second, the processing of the joint surface is generally carried out on a large floor boring machine, and the current large floor boring machine with a rotary table size larger than 3x3m generally has a low rotation angle accuracy and is far from the seam requirements of the machine base.

[0003] In actual production and processing, when it is necessary to use an odd number of petal bases, the method adopted is to pre-join the joint surface after boring and milling, and there will always be gaps on the joint surface, such as figure 1 Shown, or there is an outer gap δ at the outer circle of the seat lobe 1 , or an inner gap δ appears at the inner circle 2 , and then according to the size and position of the gap, re-boring and milling the base flap to correct the joint surface, and then check the joint, and repeat the boring and milling and joint process continuously until the requirements are met, which is time-consuming and laborious

In addition, the direction of the workpiece may be wrong if you do not pay attention during the re-boring and milling correction process, and it is difficult to achieve the same benchmark after re-calibration

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