Sampling method of partial circular arc cambers for nuclear grade stainless steel forgings

Abstract

The invention discloses a sampling method of partial circular arc cambers for nuclear grade stainless steel forgings, which uses a numerical control planer type milling machine to carry out circular arc camber sampling on a nuclear grade stainless steel forging through a numerical control programming method. The method comprises the steps of: firstly, ruling, respectively ruling sampling area lines on both end faces of a workpiece subjected to heat treatment; secondly, carrying out numerical control planer milling to ensure the bottom end face of the workpiece faces upwards, first milling theallowance on the tops of a plurality of samples on a third test ring, then respectively milling the allowance inside the samples on the third test ring through a maize milling cutter, and respectively milling the allowances at the bottoms of the samples on the test ring through a three-edge milling cutter; thirdly, turning the workpiece, and milling the sampling circular arcs of the samples on the first test ring; and fourthly, drilling the workpiece, and drilling sampling materials through a method of drilling close packing holes. The sampling method is reasonable, and can effectively reducethe amounts of the sampling test rings, thereby reducing the size and the weight of forgings, more saving the materials, and lowering the manufacture cost fundamentally.

Description

technical field [0001] The invention relates to a mechanical processing method, in particular to a method for sampling a local curved surface arc of a nuclear-grade stainless steel forging. Background technique [0002] The reactor internals are the core equipment of the nuclear power plant reactor. The main parts include the upper support flange, the upper support plate, the core support plate, the compression spring, the hanging blue flange, the outlet nozzle, the compression spring, etc. All these parts are made of nuclear Grade stainless steel forgings or nickel-based alloys. For nuclear-grade stainless steel parts, the quality of the forgings used is directly related to the safe operation and service life of nuclear power plants. The verification of the quality of forgings is based on the working status and use of the parts, intercepting representative sample blanks from different parts of the body, processing them into various samples according to the inspection requi...

AI Technical Summary

Problems solved by technology

As the nuclear power industry stipulates that a large number of various sampling tests need to be carried out on various parts, the test ring on the vertical lathe can only be removed by the whole ring, that is, the entire ring of the sample ring must be cut for each test, which is not only time-consuming and material-consuming , and greatly increased the forging size

In addition, taking into account the need to retest the material during reheat treatment, as well as the archival materials and base metal witnesses provided to users also require a large number of test materials, it is necessary to further increase the size and weight of the forging

Moreover, the retest ring is not the same test ring as the previous sampling test ring, and the material properties of the two samples cannot be guaranteed to be similar.

[0010] In addition, this sampling method needs to enlarge the size of the forging, and the enlargement of the sample will also affect the performance of the body

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