MAKING OF DEEP DIFFUSION PROTECTIVE PLIES ON PROCEEDED ARTICLES AND DEVICE TO THIS END Russian patent published in 2015 - IPC C23C26/00 

FIELD: process engineering.

SUBSTANCE: invention relates to machine building, particularly, to surface hardening of steel parts. Straining force is applied from working tool to spinning article. Said working tool is fed along surface sections that make the part profile. Simultaneously, in rolling tool shift over article surface, said strained surface sections are subjected to effects of variable rotary magnetic field of intensity within 2.5×10⁴-1×10⁵ A/m and frequency of 20-70 Hz. Rolling tool represents steel shots, 0.3-3.0 mm in diameter, placed in aqueous suspension containing 29-31% of said shots as a solid component, lead compounds PbO in amount of 13.9-14.1% and PbO₂ in amount of 13.9-14.1%, chromium compounds Cr₂O₃ in amount of 6.8-7.2%, titanium compounds TiO₂ in amount of 9.9-10.2%, black-lead lubrication in amount of 17.8-20.2% and water H₂O making the rest. Said aqueous suspension is placed into round circular case to dip the article therein unless all surface sections are completely submerged. Then, article is turned in said suspension relative to its lengthwise mirror axis at the rate of 15-30 rpm for 12-15 minutes. Effects of variable spinning magnetic field are brought about by Φ-like magnetic generators inducing the magnetic field features the clusters of magnetic lines composed by bundles revolving around lengthwise axis extending radially from periphery to the centre of circular round case. Said Φ-like magnetic generators are arranged on round circular case outer side surface in three locating cylindrical helices. Note here that the number of said Φ-like magnetic generators equals three or whatever other quantity multiple thereof. The number of said generators arranged regularly on every said helix makes 9 to 18.

EFFECT: notably longer life, higher resistance to outer aggressive effects.

2 cl, 4 dwg