GENERAL DESCRIPTION

In order to manufacture high-precision hot-strained blanks of structural steels, aluminium and magnesium alloys, such processes as isothermal press-forming, hot hydrodynamic extrusion, etc. are used.

Press-forming of blanks of high-strength stainless and structural steels is carried out with the help of low-oxidation furnaces featuring adjustable airflow coefficient during gas burning (oxidation of heated metal not more than 0.3%). Blanks of non-ferrous alloys are heated using stackable chamber furnaces with forced air circulation.

ISOTHERMAL DIE FORGING OF NON-FERROUS PARTS

The press-forming is conducted in isothermal conditions due to preliminary heating of the die with an induction plant up to a certain temperature. This allows to form parts of complex configuration with thin webs and high ribs up to 2mm thick, the ribs being up to 100mm high and having minimum grades of 0 deg. 30 sec. Metal recovery is increased up to 0.4-0.6 while the labour-intensiveness of mechanic processing is 30-40% less. The existing complex of technological equipment provides for press-forming of blanks of 300x180x100 mm in dimensions or 180mm in diameter with deep wells, maintaining class 4 accuracy.

The process is introduced in serial production using 400 ton-force DO-436 and 630 ton-force PA2638 presses equipped with UVN-300;-350 -type die induction heating plants.