The present disclosure provides a method for forging a gear capable of preventing burrs from being formed at an edge of the surface opposite to a direction in which a material in external teeth of the material is pushed. A first exemplary aspect is a method for moving the second punch along a tooth profile groove of the guide die to stack the material and the second punch in this order; and pushing the material and the second punch into a tooth profile groove of the tooth profile die in a stacked state to pass them therethrough, in which a tooth pressing part of the second punch covers at least an edge of a region where external teeth are formed on a surface of the material on the first punch side.

The present disclosure provides a method for forging a gear capable of preventing burrs from being formed at an edge of the surface opposite to a direction in which a material in external teeth of the material is pushed. A first exemplary aspect is a method for moving the second punch along a tooth profile groove of the guide die to stack the material and the second punch in this order; and pushing the material and the second punch into a tooth profile groove of the tooth profile die in a stacked state to pass them therethrough, in which a tooth pressing part of the second punch covers at least an edge of a region where external teeth are formed on a surface of the material on the first punch side.

A die (1) for mounting in an associated die holder (20) for the production of heads on elongate bodies such as nails or screws. The die has a body (2) with a top surface (3) provided with a through-going groove (4) for receiving and holding an elongate body longitudinally in said groove. Furthermore, the die has a recess (5) on one side merging into the groove (4) at one end of the groove (4) suitable for forming the head of a nail or screw. The die has a side surface portion, e.g. conical, shaped for press fit by contact with a corresponding inner surface portion of a bore or hole (30) in the associated die holder. Further, a second side surface portion (9), e.g. a plane portion, of the die serves to engage with a corresponding inner surface portion of the bore or hole of the die holder. Hereby, it is ensured, that angular orientation of the groove (4) is fixed relative to the die holder (20), and it has been proven that the two different side surface portions of the die, e.g. with a conical portion and a plane portion, provides an efficient press fit which ensures a long lifetime of the die. Further, the die is very simple to mount in the die holder, e.g. by hand, and it is simple to eject by a tool. Thus, altogether a highly efficient nail production can be obtained with such die and die holder system.

Some embodiments disclosed herein are directed to a tubular member including a central axis, a first end, a second end opposite the first end, an upset region between and axially spaced from the first end and the second end, and a first outer diameter axially spaced midway between the first end and the upset region. The upset region includes a second diameter which is larger than the first diameter, does not include a weld joint, and includes redistributed material from the tubular member.

A die holder mounts a die to form heads on nails or screws. A top surface of the die includes a groove for longitudinally receiving and holding an elongate body. The die has a recess merging into the groove at one end of the groove to form a nail or screw head. The die is conical for press fit by contact with an inner surface of a bore or hole in the die holder. A top surface of the die is planar to a top surface of the die holder with a bottom surface engaging bottom part of the die holder. The bottom portion of the die has a recess or engaging with a corresponding protrusion die holder fixing an angular orientation of the groove relative to the die holder. Two opposite dies are brought together by two opposite die holders forming the head.

A die holder mounts a die to form heads on nails or screws. A top surface of the die includes a groove for longitudinally receiving and holding an elongate body. The die has a recess merging into the groove at one end of the groove to form a nail or screw head. The die is conical for press fit by contact with an inner surface of a bore or hole in the die holder. A top surface of the die is planar to a top surface of the die holder with a bottom surface engaging bottom part of the die holder. The bottom portion of the die has a recess or engaging with a corresponding protrusion die holder fixing an angular orientation of the groove relative to the die holder. Two opposite dies are brought together by two opposite die holders forming the head.

A forging press apparatus includes: a die with a die hole into which a material is to be contained and a relief hole smaller in diameter than the die hole; a molding punch configured to press an inner portion inside a peripheral portion of the material contained in the die hole; and a pressing member provided around an outer periphery of the molding punch to press the peripheral portion. A method includes: loading the material into the die; and forging the cup structure shaped by pressing the inner portion inside the peripheral portion of the material with the molding punch to cause the peripheral portion of the material to be brought into contact with the pressing member, and a part of the material to be pushed out into the relief hole by the molding punch to form a projection while a space is secured below the projection.

A forging press apparatus includes: a die with a die hole into which a material is to be contained and a relief hole smaller in diameter than the die hole; a molding punch configured to press an inner portion inside a peripheral portion of the material contained in the die hole; and a pressing member provided around an outer periphery of the molding punch to press the peripheral portion. A method includes: loading the material into the die; and forging the cup structure shaped by pressing the inner portion inside the peripheral portion of the material with the molding punch to cause the peripheral portion of the material to be brought into contact with the pressing member, and a part of the material to be pushed out into the relief hole by the molding punch to form a projection while a space is secured below the projection.

A forging assembly may comprise a first die and a second die configured to translate toward the second die. A first sensor may be coupled to at least one of the first die or the second die. The first sensor may be configured to output a first signal correlating to a first distance between the first die and the second die. Additional sensors may be applied to track die alignment during the forging process.

A method for material forming, by means of a movable impact head and tool combination and a drive unit includes moving the drive unit to provide kinetic energy to the impact head and tool combination, for the impact head and tool combination to strike a work material, so as to form the work material. A return movement of the movable impact head and tool combination, away from the work material, after the strike of the work material by the impact head and tool combination, is dampened.