FIELD: plastic working of metals, possibly manufacture of self-trimming bolts.
SUBSTANCE: method comprises steps of pressing out guiding collar and grooves with flat bases designed for making trimming recesses; pressing out grooves in last position of die having working cavity with flat faces and diameter of inscribed circle consisting 0.9 -1.0 of minimum diameter of thread of bolt stem; pressing out cylindrical guiding collar in previous position of die. It is possible to press out for making trimming recesses two or three grooves mutually inclined by angle 180° and 120° along distance equal respectively to 3-4 and 2 pitches of thread of bolt stem.
EFFECT: enhanced quality of parts, increased strength and simplified design of tool.
3 cl, 6 dwg
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|
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| 0 |
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SU464374A1 |
