Forging method and forging device
AssigneeShowa Denko K.K.
InventorIchitami Miyashita
Life of this patent
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Abstract
Provided is a forging method capable of preventing a vibration state from being disturbed during forming. The present invention relates to a forging method in which, when a forging material W1 in a forming hole 12 of a die body 11 is plastically worked by driving a punch 2 into a forming hole 12 of the die body, ultrasonic vibrations are applied to the die body 11. The contact state of the forging material W1 with respect to a forming hole inner peripheral surface during the plastic working of the forging material W1 is classified into an insufficient contact state, a sufficient contact state, and a full contact state in order from the forming start time. An application of ultrasonic vibrations is started after shifting from the insufficient contact state to the sufficient contact state.
Claims9
A forging method in which ultrasonic vibrations are applied to a die body when a forging material in a forming hole of the die body is subjected to plastic working by driving a punch into the forming hole,
- wherein a contact state of the forging material with respect to a forming hole inner peripheral surface in a process of subjecting the forging material to the plastic working is classified into an insufficient contact state, a sufficient contact state, and a full contact state in order from a forming start time, and
- wherein application of ultrasonic vibrations is started after shifting from the insufficient contact state to the sufficient contact state.
A forging device comprising:
- a die body including a forming hole;
- a punch that performs plastic working of a forging material in the forming hole by being driven into the forming hole;
- vibration applying means that applies ultrasonic vibrations to the die body;
- and
- vibration start means that starts application of ultrasonic vibrations by driving the vibration applying means when a predetermined time has elapsed after start of forming the forging material by the punch.
A forging device comprising:
- a die body including a forming hole;
- a punch that performs plastic working of a forging material in the forming hole by being driven into the forming hole;
- vibration applying means that applies ultrasonic vibrations to the die body;
- and
- load detecting means that detects a load of the punch against the forging material;
- and
- vibration start means that starts application of ultrasonic vibrations by driving the vibration applying means at a timing at which the load of the punch has reached a preset vibration start load value based on information from the load detecting means.
A forging device comprising:
- a die body including a forming hole;
- a punch that performs plastic working of a forging material in the forming hole by being driven into the forming hole;
- and
- vibration applying means that applies ultrasonic vibrations to the die body,
- wherein it is configured such that, at a timing at which a load of the punch against the forging material has reached a vibration start load value, application of the ultrasonic vibrations is started by the vibration applying means, and
- wherein it is configured such that following relationships are satisfied;
- “Lc1”=“Lpa”דRσ”דα=0.69 to 1.87”;
- “Lpa”=0.3404דAp”(0.782−┌Ap┘/190000)דAid”0.218;
- “Rσ”=0.007דcm”−0.016;
- “σm”>10 MPa;
- and
- “Did”−“Dm”<10 mm,
- wherein “Lc1” is a vibration start load value, “Ap” is an area of a pressure surface of the punch, “Aid” is a cross-sectional area of the forming hole, “Did” is an inner diameter of the forming hole, “Dm” is an outer diameter of the forging material, and “σm” is a deformation resistance of the forging material.
Dependencies are inferred from the claim text.