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EP2727714B1 - Method for hot-forming a piece with a mechanical press - Google Patents

Method for hot-forming a piece with a mechanical press Download PDF

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Publication number
EP2727714B1
EP2727714B1 EP13382392.2A EP13382392A EP2727714B1 EP 2727714 B1 EP2727714 B1 EP 2727714B1 EP 13382392 A EP13382392 A EP 13382392A EP 2727714 B1 EP2727714 B1 EP 2727714B1
Authority
EP
European Patent Office
Prior art keywords
hydraulic chamber
mechanical press
dies
piece
forming
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP13382392.2A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2727714A2 (en
EP2727714A3 (en
Inventor
Andoitz Aranburu Irastorza
Unai Argarate Belategi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fagor Arrasate S Coop
Original Assignee
Fagor Arrasate S Coop
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fagor Arrasate S Coop filed Critical Fagor Arrasate S Coop
Publication of EP2727714A2 publication Critical patent/EP2727714A2/en
Publication of EP2727714A3 publication Critical patent/EP2727714A3/en
Application granted granted Critical
Publication of EP2727714B1 publication Critical patent/EP2727714B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/0029—Details of, or accessories for, presses; Auxiliary measures in connection with pressing means for adjusting the space between the press slide and the press table, i.e. the shut height
    • B30B15/0041—Control arrangements therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/28—Arrangements for preventing distortion of, or damage to, presses or parts thereof
    • B30B15/281—Arrangements for preventing distortion of, or damage to, presses or parts thereof overload limiting devices
    • B30B15/284—Arrangements for preventing distortion of, or damage to, presses or parts thereof overload limiting devices releasing fluid from a fluid chamber subjected to overload pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J9/00—Forging presses
    • B21J9/10—Drives for forging presses
    • B21J9/20—Control devices specially adapted to forging presses not restricted to one of the preceding subgroups
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B1/00—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen
    • B30B1/26—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen by cams, eccentrics, or cranks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/34—Heating or cooling presses or parts thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/02—Stamping using rigid devices or tools
    • B21D22/022—Stamping using rigid devices or tools by heating the blank or stamping associated with heat treatment

Definitions

  • the present invention is related to methods for hot-forming pieces with mechanical presses, in which the dies of said mechanical presses must remain closed for a certain time, particularly hot stamping processes in which the formed piece cools down inside the closed dies.
  • Mechanical presses comprising a bottom die arranged in a mount, a top portion including a top die movable with respect to the mount along guides, a motor driving said press, and a crankshaft, the motor being arranged coupled to the crankshaft by transmission means, are known.
  • the mechanical press further comprises a mechanism coupling the crankshaft to a carriage where the top die is secured, transmitting the movement of the crankshaft to the top die, said carriage being moved along the guides.
  • JPH03238200A discloses a mechanical press where improvement in operability is made, by controlling the oil pressure of a hydraulic cylinder interposed to the pressurizing point of the mechanical press, by a hydraulic control mechanism to apply relative motions to the pressurizing point, thereby controlling a pressurizing speed.
  • JPS63299900A discloses a mechanical press where, to improve dynamic accuracy of the press, the bottom dead center position of a slide is detected through a sensor, it is compared with a setting reference value, and the die height is adjusted based on the difference between the detected value and the setting value.
  • JPS59137133A discloses a mechanical press where, to enable forming with high accuracy with a relatively simple construction, the change in a die height is electrically detected and the pressure of a protector hydraulic chamber is controlled with the resulting signal.
  • An object of the invention is to provide a method for hot-forming a piece with a mechanical press.
  • the method according to the invention is defined by claim 1 and is configured for hot-forming a piece with a mechanical press comprising a top die and a bottom die adapted for forming a piece between both when they close on one another, and a mechanism that is adapted for displacing at least one die with its movement.
  • the method comprises a forming step in which the dies close on one another for forming a piece, a cooling step in which the dies remain closed at bottom dead center in which the piece is formed between the dies and a backward step in which the dies open up.
  • the method further comprises a discharging step, which occurs during the cooling step, in which at least part of a fluid present in a hydraulic chamber associated with the mechanism is discharged from the hydraulic chamber and a filling step, which occurs during the backward step, in which at least part of said discharged fluid fills the hydraulic chamber again. Therefore, by discharging the fluid from the hydraulic chamber the force that has to be exerted by the mechanism to start the machine up again decreased, preventing or greatly reducing the risk that the mechanism ends up breaking or excessively deteriorating when performing said operation.
  • the mechanical press 100 comprises a table 2 on which there is arranged a bottom die 2b and a carriage 3 to which there is fixed a top die 3b, said dies being adapted for forming a piece between both when they close, a motor not depicted in the drawings for causing the movement of at least one of the dies 2b or 3b with respect to the other die 2b or 3b so that they close on one another or open up, a crankshaft 6 coupled to the motor and a mechanism 8 with which at least one of the dies 2b and 3b is coupled to the crankshaft 6 and the rotary movement of the crankshaft 6 is transformed into linear movement of at least one die 2b or 3b.
  • the mechanism 8 can be of the crank-connecting rod type or of the link drive type, for example.
  • the top die 3b is the die that moves towards the bottom die 2b for forming the piece, but other options (either the bottom die 2b being the die that moves, or both dies 2b and 3b moving) are also possible.
  • the mechanical press 100 transforms rotary movement of the crankshaft 6 into linear movement of the top die 3b by means of the mechanism 8, varying the force generated by said mechanical press 100 along its travel according to the angle of force application, the greatest force being generated at bottom dead center of said mechanical press 100, where both dies 2b and 3b are in contact (or separated only by the piece being formed).
  • the mechanical press 100 is adapted for working in forming processes, such as hot-stamping or forging, where the piece to be formed cools down between the top die 3b and the bottom die 2b, i.e., the mechanical press 100 remains at bottom dead center for a specific time in order to cool the piece. Accordingly, the crankshaft 6 has to withstand high stress when it is operated for separating the top die 3b from the bottom die 2b.
  • the mechanical press 100 comprises a hydraulic chamber 4 arranged at the feet of the mechanism 8 for damping or absorbing possible overloads while forming the piece, and an actuator device adapted for causing at least part of the fluid present in the hydraulic chamber 4 to be discharged from the hydraulic chamber 4 when the mechanical press 100 is at bottom dead center in which the piece is formed between the dies 2b and 3b, and causing at least part of said fluid to return to the hydraulic chamber 4 once the mechanical press 100 leaves bottom dead center.
  • the hydraulic chamber 4 contains the fluid necessary for withstanding the forces that are generated and for withstanding a possible overload, and when the dies 2b and 3b open up as a result of there being less fluid present in the hydraulic chamber 4 since at least part of the fluid present has been discharged while closing the dies 2b and 3b, the force to be withstood is also less, and the mechanism 8 of the mechanical press 100 has to withstand less mechanical stress, which involves a decrease in the risk of breaking for this reason and/or an increase in the service life of the mechanism 8.
  • the fluid is preferably oil, although it could be any other fluid having analogous or similar features.
  • the mechanical press 100 remains at bottom dead center for a specific cooling time
  • the actuator device is preferably adapted for causing at least part of the fluid present in the hydraulic chamber 4 to be discharged from the hydraulic chamber 4 when, with the mechanical press 100 at bottom dead center, there is still a specific discharging time left to conclude the cooling time.
  • the discharging time is less than the cooling time.
  • the discharging time is preferably less than about 1 second.
  • the mechanical press 100 comprises a tank 10 that is communicated with the hydraulic chamber 4, and an accumulator 5 that is communicated with the tank 10 and with the hydraulic chamber 4.
  • the tank 10 receives the fluid discharged from the hydraulic chamber 4, and the accumulator 5 receives at least part of the fluid present in the tank 10, which later returns to the hydraulic chamber 4 from the accumulator 5, once the mechanical press 100 leaves bottom dead center.
  • the mechanical press 100 comprises a pump 11 arranged between the tank 10 and the accumulator 5 to pump the fluid present in the tank 10 towards the accumulator 5.
  • the actuator device of the mechanical press 100 comprises a discharge valve 40 arranged between the hydraulic chamber 4 and the tank 10 and communicated with the hydraulic chamber 4 and the tank 10, to allow or prevent fluid discharge from the hydraulic chamber 4 towards the tank 10, and a filling valve 90 arranged between the accumulator 5 and the hydraulic chamber 4 and communicated with the accumulator 5 and the hydraulic chamber 4, to allow or prevent fluid fill from the accumulator 5 towards the hydraulic chamber 4.
  • the discharge valve 40 is preferably a servo-valve, such that the amount of fluid that is discharged from the hydraulic chamber 4 can be precisely controlled.
  • the mechanical press 100 further comprises a first common conduit 12 that is attached at one end to the hydraulic chamber 4 and at the other end to a branch 13 that is communicated with the inlet of the discharge valve 40 and with the outlet of the filling valve 90, and a second common conduit 15 that is attached at one end to the inlet of the filling valve 90 and at the other end to a branch 16 that is communicated with the accumulator 5 and with the tank 10.
  • the mechanical press 100 further comprises an overload valve associated with the hydraulic chamber 4, not depicted in the drawings. If an overload is detected in the hydraulic chamber 4, the overload valve is opened to release the die from the thrust of the mechanism 8 so that the different components present in the mechanical press 100 do not break due to the overload.
  • the mechanical press 100 can comprise a plurality of hydraulic chambers 4, and an actuator device associated with each hydraulic chamber 4. Each hydraulic chamber 4 likewise comprises the conduits and the pump 11 discussed above and necessary for carrying out the filling and discharging thereof.
  • the mechanical press 100 can comprise a single tank 10, a single accumulator 5 and a single pump 11 associated with all the hydraulic chambers 4.
  • the mechanical press 100 further comprises a movement sensor adapted for causing the movement in all the hydraulic chambers 4 to be the same, getting the corresponding die to maintain its orientation.
  • the movement sensor is associated with each of the hydraulic chambers 4 and can detect the movement of the mechanism 8 on each hydraulic chamber 4 at least when fluid is discharged from the hydraulic chambers 4, and it is also associated with each of the discharge valves 40, such that it can act on the discharge valve 40 according to the movement detected in the different hydraulic chambers 4 to maintain the orientation of the corresponding die.
  • the mechanical press 100 can comprise a movement sensor associated with each hydraulic chamber 4 and its corresponding discharge valve 40, and in any of the discussed configurations, the mechanical press 100 can even comprise control means (microcontroller, microprocessor or a similar device) communicated with the movement sensor (or movement sensors), the control means being the one which acts on the discharge valves 40.
  • the control means can in turn be control means specific for this function or they can be the main control means of the mechanical press 100 responsible for performing the functions characteristic of the mechanical press 100.
  • the mechanical press 100 can further comprise an overload valve such as that discussed above associated with each hydraulic chamber 4, or a single overload valve for all the hydraulic chambers 4.
  • the invention is related to a method for hot-forming a piece with a mechanical press.
  • the mechanical press is a mechanical press 100 like the one discussed before, in any of its examples and configurations.
  • the method comprises a forming step in which the dies 2b and 3b of the mechanical press 100 close on one another for forming a piece, a cooling step in which the dies 2b and 3b remain closed at bottom dead center in which the piece is formed between the dies 2b and 3b, and a backward step in which the dies 2b and 3b open up.
  • the method further comprises a discharging step, which occurs during the cooling step, in which at least part of a fluid present in a hydraulic chamber 4 of the mechanical press 100 is discharged from the hydraulic chamber 4, and a filling step, which occurs during the backward step, in which at least part of said discharged fluid fills the hydraulic chamber 4 again.
  • the hydraulic chamber maintains the fluid necessary for withstanding the forces that are generated, and when the dies 2b and 3b open up as a result of there being less fluid present in the hydraulic chamber, the force to be withstood is also less, and the mechanism 8 of the mechanical press 100 has to withstand less mechanical stress, which involves a decrease in the risk of breaking for this reason and an increase in the service life of the mechanism 8.
  • the dies 2b and 3b remain closed for a specific cooling time, at least part of the fluid present in the hydraulic chamber 4 being discharged from said hydraulic chamber 4 when there is still a specific discharging time left to conclude the cooling time, the discharging time being less than the cooling time.
  • the discharging time is preferably less than about 1 second.
  • the method to be implemented in the example of the mechanical press 100 comprising a plurality of hydraulic chambers 4 further comprises a verification step in which the movement of each of the mechanisms 8, in their respective hydraulic chambers 4, is verified.
  • the verification step occurs while the mechanical press 100 is at bottom dead center, and more specifically while the fluid present in the hydraulic chambers 4 is being discharged.
  • the method also comprises an alignment step that is performed when it is detected in the verification step that not all the mechanisms 8 move the same way. In the alignment step, action is taken on the movement of at least one of the mechanisms 8 so that the movement of all the mechanisms 8 is the same and to thus maintain the orientation of the corresponding die.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Press Drives And Press Lines (AREA)
  • Control Of Presses (AREA)
EP13382392.2A 2012-10-30 2013-10-04 Method for hot-forming a piece with a mechanical press Active EP2727714B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ES201231658A ES2458269B1 (es) 2012-10-30 2012-10-30 Prensa mecánica adaptada para procesos de conformado, y método

Publications (3)

Publication Number Publication Date
EP2727714A2 EP2727714A2 (en) 2014-05-07
EP2727714A3 EP2727714A3 (en) 2018-01-10
EP2727714B1 true EP2727714B1 (en) 2019-05-15

Family

ID=49322310

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13382392.2A Active EP2727714B1 (en) 2012-10-30 2013-10-04 Method for hot-forming a piece with a mechanical press

Country Status (3)

Country Link
EP (1) EP2727714B1 (es)
CN (1) CN103786359B (es)
ES (2) ES2458269B1 (es)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES1267790Y (es) 2021-01-08 2021-09-10 Fagor Arrasate S Coop Prensa mecánica para conformar un material
CN112893587B (zh) * 2021-01-15 2023-01-10 重庆大江国立精密机械制造有限公司 一种自动化冲压设备

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01241345A (ja) * 1988-03-23 1989-09-26 Sumitomo Heavy Ind Ltd 熱間鍛造プレスにおける上金型高さ調整装置

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4030336A (en) * 1976-07-09 1977-06-21 Anatoly Sergeevich Grigorenko Hydraulic protection device for presses
US4166415A (en) * 1978-04-21 1979-09-04 Gulf & Western Manufacturing Company Press having overload responsive slide shut height adjusting mechanism
SU893569A1 (ru) * 1980-03-26 1981-12-30 Воронежское Производственное Объединение По Выпуску Тяжелых Механических Прессов"Воронежтяжмехпресс" Механический пресс с несколькими точками подвески ползуна
JPS59137133A (ja) * 1983-01-28 1984-08-07 Komatsu Ltd プレスのダイハイト自動補正装置
JPS62151300A (ja) * 1985-12-26 1987-07-06 Komatsu Ltd プレス機械の過荷重保護装置
JP2507740B2 (ja) * 1987-05-29 1996-06-19 株式会社 アマダ プレス機械におけるダイハイト調整装置
JPH03238200A (ja) * 1990-02-16 1991-10-23 Ishikawajima Harima Heavy Ind Co Ltd 加圧速度可変プレス
CN1077680A (zh) * 1992-04-17 1993-10-27 浙江大学 压机冲裁缓冲器
EP0596696B1 (en) * 1992-11-05 1997-09-03 Toyota Jidosha Kabushiki Kaisha Cushioning apparatus and method for optimising pressure of its cushion pin cylinders.
JP3345144B2 (ja) * 1993-12-27 2002-11-18 アイダエンジニアリング株式会社 プレス機械のスライド装置
ES2166241B1 (es) * 1999-01-15 2003-06-01 Fagor S Coop Prensa de embuticion de chapa con un dispositivo hidraulico para la deceleracion.
JP4094165B2 (ja) * 1999-03-26 2008-06-04 株式会社コスメック 機械プレスの過負荷防止装置
TW553063U (en) * 1999-08-03 2003-09-11 Kosmek Kk Device for obtaining calibration data of mechanical press, and load display device for mechanical press
JP5528984B2 (ja) * 2010-10-19 2014-06-25 アイダエンジニアリング株式会社 機械プレスのプレス荷重制御装置
ES2395350B1 (es) * 2011-02-02 2014-09-09 Fagor, S. Coop. Prensa mecánica adaptada a procesos de conformado, en particular procesos de conformado en caliente

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01241345A (ja) * 1988-03-23 1989-09-26 Sumitomo Heavy Ind Ltd 熱間鍛造プレスにおける上金型高さ調整装置

Also Published As

Publication number Publication date
ES2458269B1 (es) 2015-02-03
ES2458269A1 (es) 2014-04-30
CN103786359B (zh) 2017-03-15
CN103786359A (zh) 2014-05-14
EP2727714A2 (en) 2014-05-07
ES2728145T3 (es) 2019-10-22
EP2727714A3 (en) 2018-01-10

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