Forging device and forging method

A forging method for shaping a raw material by a forging device, the forging device including:

• a first mold and a second mold that compress the raw material;
• a first punch that is pierceable through a first hole provided in the first mold;
• a second punch that is pierceable through a second hole provided in the second mold;
• and a drive controller that controls driving of the first mold and the second mold and controls driving of the first punch and/or the second punch, the second hole in the second mold being provided at a position corresponding to the first punch and having an inner dimension larger than an outer dimension of an end part of the first punch, and the first punch has an outer dimension almost the same as an inner dimension of the first hole to slidably pierce through the first hole and has a same outer dimension, from a portion in sliding contact with the first hole to an end part on a side of the second punch, and the second hole has an inner dimension larger than the inner dimension of the first hole, the forging method comprising:
• compressing, by the drive controller, the raw material with the first mold and the second mold;
• and
• controlling, by said drive controller, driving of said the punch and/or the second punch to decrease a thickness of a raw material portion compressed by the first punch and the second punch, in accordance with a decreased thickness of the raw material portion compressed by the first punch and the second punch, while the thickness of the raw material portion compressed by the first mold and the second mold is substantially maintained, controlling, by the drive controller, movement of the first mold, the second mold and the raw material portion compressed by the first mold and the second mold to a side of the first mold and enlarging a formed cylindrical part by causing a material to flow into a gap between the first punch and the second hole, wherein
• the controlling by the drive controller includes, after the first mold and the second mold move by a fixed amount to the side of the second punch while the raw material is held between the first mold and the second mold, simultaneously moving the first punch to the side of the second punch and moving the first mold and the second mold in opposite directions, until the thickness of the raw material portion compressed by the first punch and the second punch reaches a predetermined value and, thereafter, stopping the movement of the first mold and the second mold and moving the first punch to the side of the first mold.

A forging device that shapes a raw material, the forging device comprising:

• a first mold and a second mold that compress the raw material;
• a first punch that is pierceable through a first hole provided in said first mold;
• a second punch that is pierceable through a second hole provided in said second mold;
• and
• a drive controller that controls driving of said first mold, said second mold, and said first punch, wherein
• said second hole in said second mold is provided at a position corresponding to said first punch and has an inner dimension larger than an outer dimension of an end part of said first punch,
• when said drive controller moves said first punch to a side of said second punch without moving said second punch to decrease a thickness of a raw material portion compressed by said first punch and said second punch, in accordance with a decreased thickness of the raw material portion compressed by said first punch and said second punch, while the thickness of the raw material portion compressed by said first mold and said second mold is substantially maintained, said drive controller controls movement of said first mold, said second mold and the raw material portion compressed by said first mold and said second mold to a side of said first mold and enlarges a cylindrical part formed by causing material to flow into a gap between said first punch and said second hole, and
• after said first mold and said second mold move by a fixed amount to the side of said second punch while the raw material is held between said first mold and said second mold, said drive controller simultaneously moves said first punch to the side of said second punch and moves said first mold and said second mold in opposite directions until the thickness of the raw material portion compressed by said first punch and said second punch reaches a predetermined value and, thereafter, stops the movement of said first mold and said second mold and moves said first punch to the side of said first mold.

A forging device that shapes a raw material of forging, the forging device comprising:

• a first mold and a second mold that compress the raw material;
• a first punch that is pierceable through a first hole provided in said first mold;
• a second punch that is pierceable through a second hole provided in said second mold;
• and
• a drive controller that controls driving of said first mold, said second mold, and said first punch, wherein
• said second hole in said second mold is provided at a position corresponding to said first punch and has an inner dimension larger than an outer dimension of an end part of said first punch,
• when said drive controller moves said first punch to a side of said second punch without moving said second punch to decrease a thickness of a raw material portion compressed by said first punch and said second punch, in accordance with a decreased thickness of the raw material portion compressed by said first punch and said second punch, while the thickness of the raw material portion compressed by said first mold and said second mold is substantially maintained, said drive controller controls movement of said first mold, said second mold and the raw material portion compressed by said first mold and said second mold to a side of said first mold and englarges a cylindrical part formed by causing material to flow into a gap between said first punch and said second hole,
• said first punch and said first mold are provided on a side higher than said second punch and said second mold,
• a slide member, movable in an up-down direction, is provided on an upper side of said first punch and said first mold,
• said first punch is fixed to said slide member,
• said first mold is connected to said slide member via a driver that enables adjustment of a distance between said first mold and said slide member, and
• a crankshaft that is driven to rotate, said slide member is connected to an eccentric portion of the crankshaft via a connecting rod to move in the up-down direction as a result of rotation of said crankshaft.

A forging method for shaping a raw material by a forging device, the forging device including a first mold and a second mold that compress the raw material, a first punch that is pierceable through a first hole provided in the first mold, a second punch that is pierceable through a second hole provided in the second mold, and a drive controller that controls driving the first mold, the second mold, and the first punch, the second hole in the second mold being provided at a position corresponding to the first punch and having an inner dimension larger than an outer dimension of an end part of the first punch, the forging method comprising:

• compressing, by the drive controller, the raw material with the first mold and the second mold;
• controlling, by the drive controller, movement of the first punch to a side of the second punch without moving the second punch to decrease a thickness of a raw material portion compressed by the first punch and the second punch, in accordance with a decreased thickness of the raw material portion compressed by the first punch and the second punch, while the thickness of the raw material portion compressed by the first mold and the second mold is substantially maintained;
• controlling, by the drive controller, movement of the first mold, the second mold and the raw material portion compressed by the first mold and the second mold to a side of the first mold and enlarging a cylindrical part formed by causing a material to flow into a gap between the first punch and the second hole, wherein
• the controlling, by the drive controller includes, after the first mold and the second mold move by a fixed amount to the side of the second punch while the raw material is held between the first mold and the second mold, simultaneously moving the first punch to the side of the second punch and moving, the first mold and the second mold in opposite directions, until the thickness of the raw material portion compressed by the first punch and the second punch reaches a predetermined value and, thereafter, stopping the movement of the first mold and the second mold and moving the first punch to the side of the first mold.