PROCESS OF MACHINING OF PART FROM MAGNETICALLY SOFT MATERIAL Russian patent published in 2000 - IPC

FIELD: manufacture of armatures and cores from magnetically soft chromium steel. SUBSTANCE: process includes placement of part in locked reaction chamber of pulse plasma plant, annealing of part at 700-950 C without intermediate transportation and formation of wear-resistant layer at 500-800 C in same reaction chamber. Independent of sequence of operations annealing and formation of wear-resistant layer are conducted one after another. There are possible various sequences of operations: First annealing then formation of wear-resistant layer or annealing and formation of wear-resistant layer are conducted simultaneously. Annealing should be conducted in vacuum or in presence of inert, noble or reducing gas and wear-resistant layer is manufactured by plasma nitriding. Process is more efficient than processes used before as it requires no transportation of parts between individual stages of machining, it also includes decreased requirements for storage area and expenses and prevents contamination of surface of part after annealing. EFFECT: higher efficiency of process. 10 cl, 7 dwg, 1 tbl