METHOD FOR MANUFACTURE OF DIE BLOCKS FOR EXTRUSION OF PIPE ENDS Russian patent published in 2009 - IPC B23P15/00 C21D1/78 

FIELD: machine building.

SUBSTANCE: invention is related to machine building and may be used for manufacture of die blocks. Method for manufacture of die blocks for extrusion of pipe ends includes annealing, rough mechanical processing, tempering with drawback and mechanical processing for finishing size. Matrices and puncheons of die blocks for extrusion of pipe ends are made of die steel for hot deformation of increased heat resistance and viscosity, at that mechanical processing of matrices and puncheons for finishing size is performed with account of design factor of linear expansion in process of die forging. Tempering is carried out by means of furnace heating in oxidised-reduced medium up to the temperature of not more than 750°C with soaking in furnace of not more than 1 hour, then heating up to temperature of not more than 980°C with soaking in furnace that does not exceed 1 hour and further cooling in oil.

EFFECT: increased resistance of die blocks and higher quality of extruded pipes.

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