Process for preparing large super-thick nodular cast iron container sample

Abstract

The invention relates to a process for preparing a large super-thick nodular cast iron container sample, which comprises: taking out a TM sample by using a trepanning drill blind hole sample preparation process, removing excess materials by turning or milling, and sequentially preparing a casting body by using the following processes: preparing a TD sample by using a trepanning drill; drilling a circle of central row holes at the diameter distribution position of the TD sample, wherein every two central row holes are intersected; longitudinally drilling three rows of through holes in the positions of the side face row holes and are evenly distributed in the circumferential direction by 120 degrees, and evenly dividing the positions of three sets of H1000 samples of the nodular cast iron container shell into three fan-shaped parts; sawing the 120-degree fan-shaped part into a 90-degree part and a 30-degree part respectively; longitudinally sowing off the 90-degree part in a five-equal-part mode according to 17 degrees, longitudinally sowing the 90-degree part into two equal parts respectively from the middle, namely an H1000 sample, and then milling the H1000 sample according to the size to meet the requirement; sawing the core part from the middle, and equally dividing the core part into two semicircles; and marking position lines from the top surfaces of the segmented parts according to respective regions, and further segmenting by using a conventional small sawing machine.

Description

technical field [0001] The invention relates to a sample preparation process of a large super-thick ductile iron container. It belongs to the field of nuclear power technology. Background technique [0002] The common ductile iron casting sample preparation process is to use a nesting drill to directly obtain it. It is characterized by a small body structure, a thin wall thickness, a small number of samples, and the sampling position is usually near the surface. , the process is single, and the direction of the sample is perpendicular to the outer surface of the body. Large ultra-thick ductile iron container, with a side wall thickness and bottom wall thickness of more than 500mm, and a diameter greater than Φ1500, is a cylindrical container used to store spent fuel. Its designed service life exceeds a hundred or even a thousand years. A major nuclear leak accident, so in order to verify the rationality of the casting process, for large ultra-thick ductile iron containers,...

AI Technical Summary

Problems solved by technology

The first process of commonly used sample preparation is to use the flame cutting process to divide the large ultra-thick ductile iron container into multiple small parts. The disadvantage is that the thermal processing process will destroy the material properties of the cast iron container itself, which will cause deviations in the test results.

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