PRODUCTION METHOD OF HEADED BOLT ALLOWING INTERNAL POLYHEDRON AND FLANGE, ON COLD-UPSETTING AUTOMATION Russian patent published in 2009 - IPC B21K1/46 

FIELD: metallurgy.

SUBSTANCE: production method of headed bolt allowing internal plyhedron and flange on cold-upsetting automate includes blank cutoff, further preliminary upset of fillister head and rod spinning, length of which is equal to length of complete product rod. Then it is formed fillister head of bolt till receiving of the diameter, equal to 1.01-1.02 of bolt head diameter of complete product. Then at one position it is implemented fabrication of flange and internal polyhedral chamber in a head. At following positions it is implemented bolt body reducing and lead-in chamfering at the end of a rod on pointing installation of cold-upsetting automate, with keeping of received in advance sizes of bolt head and flange, and at the last position it is implemented thread rolling.

EFFECT: ensured by optimal assignment of manufacturing efforts by upset passes and simplification of forging equipment, improvement of complete products and increasing of form tool durability.

2 cl, 1 dwg