Special fixture for preparation of oxygen-nitrogen samples in metal and manufacturing method of special fixture

Abstract

The invention discloses a special fixture for the preparation of oxygen-nitrogen samples in metal. The special fixture comprises two oppositely-arranged cast iron plates, wherein the length, the width, the thickness and the surface roughness of each cast iron plate are 300 mm, 30 mm, 4.9 to 5 mm and 1.6 [mu]m correspondingly; each cast iron plate is made of ductile cast iron QT300; 11 to 16 semicircular holes are uniformly formed in one side of each cast iron plate; the distance between every two adjacent semicircular holes is 15 mm; and the semicircular holes in the two cast iron plates are oppositely arranged and jointly combined to form circular holes of which the hole diameter is phi 5 to 5.05 mm. By adoption of the special fixture, 10 or more samples can be simultaneously machined at a time, thereby improving the sample machining efficiency by 10 times or above and relatively well solving the problem about identity in the sample machining process; the good consistency in the dimensional tolerance, the precision and the surface roughness of the prepared samples can be achieved; and accordingly, the popularization prospect is extensive and the practical value is very great.

Description

Technical field [0001] The invention relates to the technical field of metallurgical analysis sample processing, in particular to a special clamp for preparing oxygen and nitrogen samples in metal and a manufacturing method thereof. Background technique [0002] The oxygen and nitrogen gas inclusions in the steel have a great influence on the performance of the steel. In many cases, when the gas impurity in the steel exceeds a certain concentration, it will reduce the tensile, yield, impact strength and elongation of the steel; when the nitrogen content exceeds a certain limit At this time, bubbles are easy to form in the steel, causing the internal structure of the steel to be loose, the toughness decreases, and the brittleness increases, which will have various effects on product performance and quality. In order to control product quality and improve performance, accurate and rapid determination of gas content in steel has long become an important task in metallurgical work, a...

AI Technical Summary

Problems solved by technology

The traditional sample processing technology usually adopts lathe turning, cylindrical grinder fine grinding, and after the lathe cuts to length, then grinds the end faces one by one with sandpaper. There are large differences in characteristics, and the time limit is difficult to meet the requirements of product development and smelting production

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