METH0D OF HEAT AND-POWER-TREATMENT OF LONG-CUT ARTICLES Russian patent published in 2005 - IPC

FIELD: heat-and-power treatment of long-cut low-rigid axisymmetrical parts, such as shafts.

SUBSTANCE: proposed method includes power action on blank in the course of complete cycle of heat treatment; heat treatment cycle is divided into three sub-cycles; each sub-cycle includes action on blank within selected area by successive deformation in various directions; boundaries of selected area are controlled by control of temperature action on blank; length of section is selected taking into account harmonics of vibrations of part. In the course of complete cycle of heat treatment, sections at insufficient deformation are heated and those at excessive deformation are cooled. Device proposed for realization of this method includes jig with blank retainer and heating element which is provided with hole for placing the blank; each retainer is provided with wedges engageable with rods fitted with hydraulic cylinders at their ends, guide ring mounted for free rotation in retainer hole and pneumatic system; ring-shaped heating element is arranged coaxially relative to blank. Each section has four prods and is insulated by means of heat-insulating inserts located inside heat-insulating rings in form of corrugated bushes. Heating element is of induction type. This device includes control system equipped with linear motion and angular position sensors fitted in retainers and connected with control circuit; control system has three control circuits: one circuit is used for control of level and rate of longitudinal deformation; second circuit is used for control of level and rate of torsional deformation and third circuit is used for control of temperature action; each control circuit includes sensor, amplifier, adder, parameter setter and control unit.

EFFECT: enhanced stability of sizes and shape of long-cut articles due to elimination of directivity of axial residual deformation and directed texture of material lengthwise.

9 cl, 9 dwg