A METHOD OF THERMAL DEFORMATION TREATMENT OF CHROMIC BRONZE ITEMS Russian patent published in 2004 - IPC

FIELD: production of items made out of low alloys based on copper.

SUBSTANCE: the invention presents a method thermal deformation treatment of items from chromic bronze and is dealt with the field of production items out of low alloys based on copper, in particular - made out of chromic bronze. The purpose of the invention is to ensure a stable level of the items mechanical characteristics, for example, solidity of items made out of chromic bronze, proper values of longitudinal curvature of sticks and a high level of appearance of the items. The method of thermal deformation treatment of the indicated items, provides for a hardening of a hot-deformed billet, no less than a twofold drawing of this billet up to the finishing sizes and ageing. The ageing operation is conducted after the billet drawing up to pre-finished sizes. After that they conduct a finishing drawing of the aged billet up to the finished sizes. The finishing drawing is conducted with the elongation ratio of 1.10...1.25. The treatment of items according to production procedure on the offered method allows with a guarantee to produce bars out of bronze БрХ1, completely meeting all requirements of the standard, including by solidity and longitudinal curvature. Besides the items have an attractive commercial look peculiar to the cold-drawn items with a flat, defectless, brilliant surface.

EFFECT: the offered method ensures guaranteed production of sticks out of bronze БрХ1 completely meeting all requirements of the standard.