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公开(公告)号：US11541444B2
公开(公告)日：2023-01-03
申请号：US15798350
申请日：2017-10-30
Applicant: AIDA ENGINEERING, LTD.
Inventor： Yasuyuki Kohno
Abstract: A die cushion device of a press machine includes a hydraulic cylinder that supports a cushion pad and generates die cushion force when a slide of the press machine descends, an orifice and a hydraulic pump/motor that are connected to each other in in parallel between a lower chamber of the hydraulic cylinder and a tank, a servo motor connected to a rotating shaft of the hydraulic pump/motor, and a control unit that controls torque of the servo motor to control the die cushion force, wherein a rotation direction of the servo motor switches from a first rotation direction in which the hydraulic pump/motor serves as a hydraulic motor to a second rotation direction in which the hydraulic pump/motor serves as a hydraulic pump, during generation of the die cushion force.
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公开(公告)号：US11529664B2
公开(公告)日：2022-12-20
申请号：US16250334
申请日：2019-01-17
Applicant: AIDA ENGINEERING, LTD.
Inventor： Yasuyuki Kohno
Abstract: A press system providing excellent energy efficiency for a whole press system and capable of achieving low prices is provided. A die cushion apparatus constituting a press system supports a cushion pad, includes a hydraulic cylinder which generates a die cushion load on the cushion pad when a slide of a press machine descends, the press machine includes a hydraulic cylinder which generates part of a press load on the slide when the slide descends. The pressure generation chamber of the hydraulic cylinder for generating a die cushion load and the pressure generation chamber of the hydraulic cylinder for generating part of the press load can communicate with each other via pipes and a first logic valve for a period during which the die cushion load acts.
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公开(公告)号：US10603709B2
公开(公告)日：2020-03-31
申请号：US15727863
申请日：2017-10-09
Applicant: AIDA ENGINEERING, LTD.
Inventor： Yasuyuki Kohno , Tadahiro Kondo
Abstract: There is provided a die cushion device that includes a cushion pad, a hydraulic cylinder configured to lift the cushion pad, and a hydraulic closed circuit connected to a die cushion pressure creation chamber of the hydraulic cylinder. The hydraulic closed circuit includes a pilot drive type logic valve that is operable as a main relief valve at the time of the die cushion operation, and a pilot relief valve configured to create pilot pressure for controlling the logic valve. Hydraulic oil is filled in the hydraulic closed circuit, in a pressurized manner, and the hydraulic oil in the hydraulic closed circuit is pressurized by only die cushion force applied from the cushion pad through the hydraulic cylinder, in one cycle period of the cushion pad.
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公开(公告)号：US10124390B2
公开(公告)日：2018-11-13
申请号：US14855170
申请日：2015-09-15
Applicant: AIDA ENGINEERING, LTD.
Inventor： Yasuyuki Kohno
Abstract: There are provided position controllers each of which controls a position of a cushion pad by controlling a hydraulic machine that supplies pressure oil to a die cushion pressure generation chamber of a hydraulic cylinder, and pressure controllers each of which controls pressure in the die cushion pressure generation chamber of the hydraulic cylinder, and in particular, during a rising process of a slide of a press machine, position control by the position controller and pressure control by the pressure controller are switched to enable press forming also during the rising process.
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公开(公告)号：US09815251B2
公开(公告)日：2017-11-14
申请号：US13861894
申请日：2013-04-12
Applicant: AIDA ENGINEERING, LTD.
Inventor： Yasuyuki Kohno
CPC classification number: B30B15/148 , B30B1/181 , B30B1/24 , B30B1/265 , B30B15/0041 , B30B15/007 , B30B15/14 , B30B15/24
Abstract: A slide motion control apparatus for a mechanical press comprising: a slide which is disposed so as to be relatively vertically movable with respect to a driven body to which a drive force is transmitted through a con rod of the mechanical press; a relative position commander that outputs a relative position command indicating a relative position of the slide with respect to the driven body; a relative position detector that detects a relative position of the slide with respect to the driven body, and outputs a relative position detecting signal indicating the detected relative position; a servomotor; a drive mechanism that relatively moves the slide with respect to the driven body by a drive force of the servomotor; and a controller that controls the servomotor based on a relative position command signal output from the relative position commander, and the relative position detecting signal output from the relative position detector.
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Patent Agency Ranking
公开(公告)号：US09808849B2
公开(公告)日：2017-11-07
申请号：US15366237
申请日：2016-12-01
Applicant: AIDA ENGINEERING, LTD.
Inventor： Yasuyuki Kohno
Abstract: A slide cushion device includes: a hydraulic cylinder group integrally formed in a board provided immediately below a slide; a pressing member that is disposed in a recessed portion of an upper die that vertically moves together with the slide, in a vertically movable manner; a plurality of slide cushion pins that is provided in the pressing member and penetrates the upper die to be brought into contact with a piston member of the hydraulic cylinder group, wherein a number of the cushion pins is less than a number of hydraulic cylinders disposed in a plane of projection of the recessed portion; and a slide cushion hydraulic device that controls hydraulic pressure to be supplied to a compression chamber of the hydraulic cylinder with which a slide cushion pin is to be brought into contact.
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公开(公告)号：US11110505B2
公开(公告)日：2021-09-07
申请号：US16291363
申请日：2019-03-04
Applicant: AIDA ENGINEERING, LTD.
Inventor： Yasuyuki Kohno
Abstract: A cushion pin pressure equalizing device that can absorb a variation in height of a plurality of cushion pins and control a die cushion load highly accurately, a die cushion device, and a cushion pin pressure equalizing method are provided. An initial pressure in ascending-side pressurizing chambers of a pressure equalizing hydraulic cylinder group for absorbing a variation in height of cushion pins is controlled so as to be an appropriate pressure. The variation in height of the plurality of cushion pins can be absorbed within a shortest stroke of a slide after the slide comes into collision with a cushion pad so as to equalize die cushion loads that are applied individually to the cushion pins and a target die cushion load can be generated within the shortest stroke of the slide, whereby a response to application of the die cushion load can be stabilized without excessive delay.
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公开(公告)号：US20210060887A1
公开(公告)日：2021-03-04
申请号：US16931250
申请日：2020-07-16
Applicant: AIDA ENGINEERING, LTD.
Inventor： Yasuyuki Kohno , Ryosho Iwamura
Abstract: The press machine includes: a hydraulic cylinder configured to drive a slide; a plurality of hydraulic pumps/motors; a first port of each of which is connected to a first pressurizing chamber of the hydraulic cylinder; a plurality of servomotors axially connected to rotating shafts of the respective hydraulic pumps/motors respectively; a low-pressure accumulator to which second ports of the hydraulic pumps/motors are each connected; a high-pressure accumulator connected to a second pressurizing chamber of the hydraulic cylinder; and a slide position controller configured to control the servomotors so that a position of the slide matches a position corresponding to a slide position command signal based on the slide position command signal from a slide position commander and a slide position signal from a slide position detector.
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公开(公告)号：US10160175B2
公开(公告)日：2018-12-25
申请号：US14166441
申请日：2014-01-28
Applicant: AIDA ENGINEERING, LTD.
Inventor： Yasuyuki Kohno , Ryosho Iwamura , Tadahiro Kondo
Abstract: There is provided a press machine which can apply a large compression force to a mold as well as impart smooth vibration only in a rectilinear advancing direction to the mold, and thereby can improve the press-formability. A main slide and a sub-slide constitute a slide and at the same time a cylinder-piston mechanism. During press-forming, a compression force is transmitted to the sub-slide (an upper mold) through hydraulic pressure applied interlockingly with driving of the main slide, and the sub-slide is vibrated with the hydraulic pressure being periodically changed. Favorable press-forming can be performed even under relatively difficult press-forming conditions, by controlling the vibration such that a vibration frequency of the sub-slide (the upper mold) becomes 9 Hz or higher but 33.3 Hz or lower and a vibration amplitude of the sub-slide becomes 0.05 mm or larger but 0.5 mm or smaller.
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公开(公告)号：US11826810B2
公开(公告)日：2023-11-28
申请号：US17076497
申请日：2020-10-21
Applicant: AIDA ENGINEERING, LTD.
Inventor： Yasuyuki Kohno , Kazufumi Tsuchida
IPC: B21D24/02
CPC classification number: B21D24/02
Abstract: A die cushion device includes four hydraulic cylinders that support a cushion pad, a die cushion load controller that controls each of the hydraulic cylinders and generates a die cushion load on the cushion pad, and a die cushion position controller that controls each of the hydraulic cylinders to control a position of the cushion pad. In a case where only a left part is produced with a left die by a press machine, the die cushion load controller performs die cushion load control on two hydraulic cylinders on the left side, and the die cushion position controller performs die cushion position control on two hydraulic cylinders on the right side.
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