Die punch for manufacturing fasteners

Abstract

The invention discloses a die punch for manufacturing fasteners. The fasteners are screwdrivers, and the die punch is a stamping die for manufacturing the screwdrivers. The punch of the die comprisesa tapered outer edge, a plurality of ribs disposed around the outer edge and a beveled surface, and the beveled surface is arranged to remove burrs. The die punch can be used for forming various slotsincluding star-shaped or plum-shaped slots. The screwdrivers are more closely inserted into slots of screws to further enable the screws to be more firmly and smoothly screwed into a workpiece, and the occurrence of shaking, vibration and tilting is reduced.

Description

technical field [0001] The present invention relates to a die punch for manufacturing fasteners, in particular to a die punch for manufacturing fasteners with quincunx or star-shaped slots. Background technique [0002] Generally, to manufacture screws or screwdrivers, the metal wire will be drawn first, usually the metal wire will be stretched to a certain thickness, and then a punch will be used to make it into a screw or screwdriver with a screw head and a rod, and then a Rolling and rubbing dies form threads on the rod, and the screw head is usually formed by a stamping process, and the screw head will be stamped with a slot at the same time. The first stamping provides a slot positioning point to facilitate the second stamping, and the second stamping is the second stamping to form a slot in the head of the fastener , if the slot is well designed, a screwdriver bit can be safely and stably inserted and fitted into the slot so that the screwdriver bit can turn the faste...

AI Technical Summary

Problems solved by technology

[0009] Still referring to U.S. Patent No. US8955417, the male die is used to stamp a metal blank, so that the metal blank is deformed in a predetermined direction under pressure control conditions, in order to reduce scratches caused by metal overflow in the slot, An overflow groove is set on the punch, however, this overflow groove reduces the precision of the slot formed by punching, because the mold cavity is not filled, in the male mold of this patent, the protrusion is in a vertical direction, The conical surface is used to guide the metal flow. The slope of the conical surface is quite large. When stamping, the vertical protrusions do not leave space for the metal to overflow, but the conical surface provides too much space for the overflow metal due to its slope. space, so burrs will be formed on the edge of the protrusion, which is caused by the uneven distribution of space in the cavity, and in order to remove the burrs, a secondary processing procedure is required, and in the part of the conical surface, the cavity cannot is filled, so not only will the precision be reduced, but the tool and workpiece may not fit smoothly

Images