Method of forming through-hole and through-hole forming machine
OwnerEizou Uenoinventor
Life of this patent
Estimating the term…
Abstract
The method of forming a through-hole is capable of preventing formation of burrs, improving machining efficiency and reducing machining cost. The method of forming a through-hole in a circular wall of a cylindrical part of a work piece comprises the steps of: setting the work piece in a die; inserting a punch, which is provided to a rod-shaped metal core and whose length projected from the metal core is shorter than thickness of the circular wall, into the cylindrical part; relatively pressing and moving the punch toward the die so as to drive the punch into an inner face of the circular wall and bore the through-hole; sucking a scrap, which is formed by boring the through-hole, via a discharge hole of the die.
Claims14
A method of forming a through-hole in a circular wall of a cylindrical part of a work piece,
- comprising the steps of:
- setting the work piece in a die;
- inserting a punch, which is provided to a rod-shaped metal core and whose length projected from the metal core is shorter than thickness of the circular wall, into the cylindrical part;
- relatively pressing and moving the punch toward the die so as to drive the punch into an inner face of the circular wall and bore the through-hole;
- sucking a scrap, which is formed by boring the through-hole, via a discharge hole of the die.
A through-hole forming machine for forming a through-hole in a circular wall of a cylindrical part of a work piece,
- comprising:
- a die for holding the work piece;
- a punch for boring the through-hole with the die, the punch being provided to a front end of a rod-shaped metal core, having a length, which is projected from the metal core, shorter than thickness of the circular wall, and being inserted into the cylindrical part;
- and
- a mechanism for relatively pressing and moving the punch toward the die so as to drive the punch into an inner face of the circular wall and bore the through-hole,
- wherein a rear end of the metal core is detachably attached to a block for holding the metal core.
A through-hole forming machine for forming a through-hole in a circular wall of a cylindrical part of a work piece,
- comprising:
- a die for holding the work piece;
- a punch for boring the through-hole with the die, the punch being provided to a rod-shaped metal core, having a length, which is projected from the metal core, shorter than thickness of the circular wall, and being inserted into the cylindrical part;
- and
- a mechanism for relatively pressing and moving the punch toward the die so as to drive the punch into an inner face of the circular wall and bore the through-hole,
- wherein a front end face of the punch is chamfered along the inner face of the cylindrical part.
Dependencies are inferred from the claim text.