DEVICE FOR HEAT TREATMENT OF THIN WALL AXISYMMETRIC PRODUCTS Russian patent published in 2015 - IPC C21D9/06 C21D9/40 

FIELD: machine building.

SUBSTANCE: device for straightening of thin-wall axisymmetric products out of high strength, mainly martensite-ageing steels during their heat treatment is made as assembly of hollow mandrel and expanding mandrel, made out of steel with coefficient of thermal expansion close to coefficient of thermal expansion of the material of the heat treated product. The expanding mandrel is made out of bottom and top casings coaxially assembled by pipe branches with axisymmetric cone sections looking inside the expanding mandrel. On the cone surfaces of the bottom and top casings the segments are installed by counter cone surfaces, they are spring loaded to axis of the mandrel by springs installed in ring grooves of the segments. The bottom and top casings of the mandrel are made with possibility of limited axial movement by means of the wedge moving in plane of normal axis of the mandrel, and interacting with end of the pipe branch of top or bottom casing and slot in the pipe branch of the top or bottom casing.

EFFECT: stable assurance of set accuracy of thin wall axisymmetric products.

2 cl, 3 dwg