FIELD: plastic metal working, namely manufacture of railroad wood screws by cold forming and knurling. SUBSTANCE: method comprises steps of preliminarily cutting blank, subjecting it to cold forming for successively making preliminary head in the form of truncated cone, finished tetrahedral flanged head, smooth portion of rod, rod portion for thread knurling. Buttress wood screw thread is made by cold knurling. Smooth portion of rod is made by upsetting initial blank with diameter equal to 0.8-0.85 of diameter of smooth portion. Diameter of rod portion for knurling thread is formed equal to 0.75- 0.82 of outer diameter of thread; transition cone is made between smooth portion and rod portion with diameter for thread knurling. EFFECT: lowered labor consumption, enhanced quality of wood screws. 4 cl, 2 dwg
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Authors
Dates
1997-12-27—Published
1996-03-19—Filed