Travel shell of blind-hole rod of control rod drive mechanism in pressurized water reactor and method of machining travel shell

Abstract

The invention relates to the technical field of methods of machining parts of pressurized water reactor equipment and discloses a method of machining a travel shell of a blind-hole rod of a control rod drive mechanism in a pressurized water reactor; the outer diameter of the blind-hole rod is less than 100 mm and length-diameter ratio of the blind-hole rod is greater than 54; the method comprises the steps of (1) roughly machining rough outside of a small end of a slender rod; (2) roughly drilling a blind hole; (3) correcting segment by segment, roughly machining the outside of the small end of the slender rod to ensure the coaxiality and positionality of the blind hole and outside; (4) machining the blind hole to preset size; (5) finely turning the outside segment by segment to arrive at a positioning reference; (6) machining the outside of the small end of the slender rod segment by segment for forming purpose in order to ensure the coaxiality or positionality of the blind hole and outside; (7) machining the outside, screw thread and weld groove of the large end of the slender rod. By using the method, the problems in the technique of machining the travel shell of the blind-hole rod of a slender rod in the control rod drive mechanism in the pressurized water reactor are solved; product precision is ensured, the dimensions meet the requirements of drawings.

Description

technical field [0001] The invention relates to the technical field of processing methods for pressurized water reactor nuclear power equipment parts, in particular to a blind-hole rod travel casing of a pressurized water reactor control rod drive mechanism and a processing method. Background technique [0002] Under normal circumstances, the processing of slender rods adopts methods such as "turning method with tool holder" and "reverse turning method". Turning with the turret can significantly improve the machining accuracy of the slender rod and increase the rigidity of the process system. When using the slender rod for forward and reverse cutting, it is found that the deformation and machining error of the slender rod during reverse turning are much smaller than those of the positive rod under the same conditions. Deformation and error towards turning. [0003] The stroke casing of the blind-hole rod of the PWR control rod drive mechanism has a blind hole and a length o...

AI Technical Summary

Problems solved by technology

When it is processed by the above method, although the machining accuracy of this process can be guaranteed, it cannot correct the deviation of the inner and outer circle positions and coaxiality of the existing blind holes, so that the machined inner and outer circle positions cannot meet the accuracy required by the drawings and processes

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