Method and an apparatus for making an elongate object
AssigneeEnkotec A/S
InventorOve Nielsen
Life of this patent
Estimating the term…
Abstract
In a method of making an elongate object (49) with a head at one end and a point at the other end, a blank (49) is placed in a die (50) having a through-going channel, following which the head end is subjected to axial pressure by a tool (52), while a stop member (55) is kept engaged with the die (50) at its other end. A pre-formed head is initially provided on the blank (49) so that the head has an excess of material with respect to the size of the final head. A cavity (56) is formed in the stop member and is in extension of the through channel. When blank (49) is subjected to axial pressure the tool (52) causes flow of material in the shank of the blank (49) so that blank material flows into the cavity (56) of the stop member.
Claims14
A method of making an elongate object having a head at one end and a point at the other end, comprising the steps of:
- providing a preformed head on a shank of a blank so that said head has an excess of material with respect to a final head to be formed on the object,
- placing the shank of the blank in a through hole of a die such that said head of the blank is at one end of the die and an end of the shank is at an opposite end of the die,
- engaging a stop member at said opposite end of the die, said stop member being formed with a cavity in extension of said through hole and facing said end of the shank, said stop member bearing against said die outside said through hole and not extending into said through hole, and
- applying axial pressure to said head of the blank to produce flow of material in said shank of the blank so that said material flows at said end of the shank into the cavity in the stop member.
Apparatus for making an elongated object having a head at one end and a point at the other end, said apparatus comprising:
- a die having opposite surfaces and a through hole extending through said die from one of said surfaces to the other, said through hole being adjusted for receiving a shank of a blank having a preformed head at one end of the shank, said preformed head being located at said one surface of the die.
- a stop member engageable with said die at said other surface of the die outside said through hole and not extending into said through hole, said stop member having a cavity in extension of said through hole to face an end at said shank of the blank, and
- means for applying axial pressure to said head of the blank to produce flow of material in said shank of the blank so that said material flows at said end of the shank into the cavity in said stop member.
Dependencies are inferred from the claim text.