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CN-122007306-A - Forging device

CN122007306ACN 122007306 ACN122007306 ACN 122007306ACN-122007306-A

Abstract

The invention provides a forging device capable of simplifying or miniaturizing the structure. The lower die is internally provided with a sliding member protruding in a direction orthogonal to the vertical movement direction of the punch in a region where the punch moves up and down, a cam surface for bringing the sliding member into contact with and moving to a position retracted from the region and a position protruding toward the region is provided on an outer peripheral surface of the punch, a coupling member operating together with the sliding member is provided in the lower die together with the sliding member, and the stripper is configured to be mounted on the coupling member and moved to a position engaged with the workpiece and a retracted position spaced apart from the workpiece by the coupling member.

Inventors

  • KOMODA TATSUYA
  • TODO TAKASHI

Assignees

  • 丰田自动车株式会社

Dates

Publication Date
20260512
Application Date
20251105
Priority Date
20241111

Claims (4)

  1. 1. A forging apparatus, comprising: An upper mold and a lower mold for applying pressure to the workpiece to generate plastic deformation, thereby forming the workpiece into a predetermined shape; a stripper for pulling down the work piece in opposition to the work piece attached to the upper die and raised, thereby separating the work piece from the upper die, and An ejector that ejects the work from the lower side to separate the work from the lower side, The forging apparatus is characterized in that, A sliding component protruding in a direction orthogonal to the up-down moving direction of the ejector and retreating in the up-down moving area of the ejector is arranged in the lower type, And a cam surface provided on the outer peripheral surface of the ejector for bringing the sliding member into contact with and moving the sliding member to a position retracted from the region and a position protruding toward the region, A connecting member that operates together with the sliding member is provided inside the lower form together with the sliding member, The stripper is configured to be attached to the coupling member and to be moved by the coupling member to a position to engage with the workpiece and to a retracted position spaced apart from the workpiece.
  2. 2. The forging apparatus as recited in claim 1, wherein, The plurality of stripper units are arranged at equal intervals on the circumference centering on the work piece on the outer circumferential side of the work piece.
  3. 3. A forging apparatus as recited in claim 1 or 2, wherein, The cam surface has a lowermost end portion, a portion upward from the lowermost end portion is an inclined surface which recedes from an outer peripheral surface of the ejector toward a center side, The lowermost end portion is formed on an outer peripheral surface of the ejector so as to be located at a position higher than the sliding member at a position where the work lifted by the ejector engages with the stripper.
  4. 4. A forging apparatus as recited in claim 1 or 2, wherein, The connecting member is composed of a rotating shaft member which is held in the lower portion in the vertical direction and rotates around a central axis along the vertical direction, The sliding member is attached to a lower end portion of the rotating shaft member, and rotates together with the rotating shaft member to cause a part of the tip side to protrude toward the region and retract, The stripper is attached to an upper end portion of the rotating shaft member, and rotates together with the rotating shaft member to cause a part of the tip side to protrude and retract to a position where the stripper engages with the workpiece.

Description

Forging device Technical Field The present invention relates to a device for forging a workpiece by upper and lower dies, and more particularly, to a forging device provided with a stripper for separating the workpiece from the upper die. Background Since forging is a process of applying a load to a workpiece to give the workpiece a predetermined shape, the workpiece is in a state of being attached to an upper or lower die, and therefore a stripper or ejector for releasing the workpiece from a die is required in a forging apparatus. Patent document 1 describes a forging die provided with a mechanism for such peeling and a mechanism for ejection. The forging die described in patent document 1 is a device for forming a workpiece into a predetermined shape and punching a center portion by a die provided in a lower die and a punch provided in an upper die, and a stripper for pressing a flange portion of the workpiece to a lower die side is provided in the upper die so as to be movable up and down. Specifically, the stripper is attached to a lower end portion of a lever held by an upper die so as to be movable up and down, and a spring is further provided to press the stripper so as to be pushed out downward from the upper die. On the other hand, an ejector pin that moves up and down by a predetermined driving mechanism is disposed below the mold in the lower mold. In the forging die described in patent document 1, after a predetermined process is performed on a workpiece by lowering an upper die to a bottom dead center, a stripper maintains a state of pressing the workpiece against a lower die by a spring force during an ascent of the upper die. That is, the work is peeled from the upper die by the stripper relatively descending with respect to the upper die. Then, the ejector pin is raised by a predetermined driving mechanism, and the workpiece is ejected from the lower die by the ejector pin. Patent document 1 Japanese patent laid-open No. 2006-326665 Disclosure of Invention The apparatus described in patent document 1 is configured as a forging die that performs straightening of a flange of a workpiece together with forging, and therefore a straightening holder that presses a stripper toward the flange is disposed on the back side (upper side) of the stripper. By providing the correction retainer, the stripper firmly presses the flange to perform the correction even during the ascent of the upper form. In this way, in the structure described in patent document 1, the stripper must be provided in the upper type. In contrast, since the ejection of the work is performed after the upper die rises to the top dead center and stops its operation, the ejector pin or the mechanism for driving the same has to be provided independently of the upper die or the stripper, respectively. That is, in the conventional apparatus such as the forging die described in patent document 1, since the stripper, ejector, and the like for separating the workpiece from the forging die are separately provided together with the driving mechanism thereof, the structure of the entire apparatus is complicated, and there is a possibility that the apparatus becomes large, and from this point, there is still room for improvement. Further, although the mechanism for the stripper and the mechanism for the ejector can be associated with each other, there is room for development of a new structure for simplifying the structure of the entire apparatus or for miniaturizing the apparatus. The present invention has been made in view of the above-described technical problems, and an object thereof is to provide a forging apparatus capable of simplifying or miniaturizing the structure. In order to achieve the above object, the forging apparatus of the present invention includes an upper die and a lower die for applying pressure to a workpiece to cause plastic deformation, thereby forming the workpiece into a predetermined shape, a stripper for pulling down the workpiece in opposition to the workpiece attached to the upper die and raised to separate the workpiece from the upper die, and an ejector for lifting up the workpiece from the lower die, wherein a slide member protruding in a direction orthogonal to a vertical movement direction of the ejector in a region in which the ejector moves up and down is provided inside the lower die, and a cam surface for bringing the slide member into contact with and moving to a position retracted from the region and a position protruding to the region is provided on an outer peripheral surface of the ejector, and a coupling member that operates together with the slide member is provided inside the lower die together with the slide member, and the stripper is configured to be attached to the coupling member and to separate from the workpiece by the contact with the slide member. In the present invention, the plurality of stripper units may be arranged at equal intervals on the outer peripheral side of the work on a circ