EP3088172B1 - Presse de compression et son utilisation - Google Patents

Presse de compression et son utilisation Download PDF

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Publication number
EP3088172B1
EP3088172B1 EP16167361.1A EP16167361A EP3088172B1 EP 3088172 B1 EP3088172 B1 EP 3088172B1 EP 16167361 A EP16167361 A EP 16167361A EP 3088172 B1 EP3088172 B1 EP 3088172B1
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EP
European Patent Office
Prior art keywords
support
motor
towards
movement
electric motor
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EP16167361.1A
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German (de)
English (en)
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EP3088172A1 (fr
Inventor
Catello Sorrentino
Gabriele NEVA
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GF SpA
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GF SpA
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    • 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
    • B30B1/18—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 screw means
    • B30B1/181—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 screw means the screw being directly driven by an electric motor
    • 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
    • B30B1/18—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 screw means
    • B30B1/186—Control arrangements

Definitions

  • the object of the present invention is a compression press and a forming method that employs the press.
  • compression presses known in the prior art that comprise a fluid-dynamic piston that moves a first forming plate that supports a first half-mould.
  • the piston makes it possible to move the first plate towards or away from a second plate, which:
  • the technical task underlying the present invention is to offer a compression press and a forming method that make it possible to improve the quality of the product obtained by pressing.
  • the defined technical task and the specified aims are substantially achieved by a compression press and a method for forming an object, comprising the technical characteristics set forth in one or more of the appended claims.
  • the press 1 comprises:
  • the first and the second half-mould cooperate for moulding the product.
  • the first and the second half-mould can be removably constrained to the first and the second support 21, 22, respectively. They are replaceable according to the product one wishes to obtain. Therefore, the first and second half-mould are not part of the press claimed, but they are additional elements to be added according to the specific form of the product one wishes to obtain.
  • the pressing process is a hot-pressing process.
  • the second support 22 is opposite the first support 21. They face each other.
  • the first and the second support 21, 22 are found one above the other.
  • the first support 21 is found above the second support 22.
  • the first and the second support 21, 22 are capable of being brought towards and/or away from each other. Typically, they can be brought towards and/or away from each other along a first direction 5.
  • this first direction 5 is vertical.
  • the first support 21 can move in translational motion with respect to the second support 22.
  • the press 1 comprises at least a first, a second and a third electric motor 31, 32, 33 that control the movement of the first and the second support 21, 22 towards and/or away from each other.
  • the first, the second and the third electric motor 31, 32, 33 act in a first, a second and a third zone 211, 212, 213 of the first support 21, respectively.
  • one or more additional electric motors for activating the first support 21 may also be present.
  • the presence of at least three electric motors that can independently control the planarity of three points on the first support 21 is important. In fact, at least three points are needed to identify a plane in space and for this plane to remain substantially parallel to itself (within very limited tolerances) during movement.
  • the first, the second and the third motor 31, 32, 33 are brushless motors (it is also possible that only one of these motors is brushless). They afford greater control of the power and improved precision of the positioning of the first and the second support 21, 22 (so as to obtain maximum planarity of the first and the second support 21, 22).
  • the first, the second and the third motor 31, 32, 33 can be activated independently of each other.
  • the press 1 comprises a control device that controls the operation of at least the first, the second and the third electric motor 31, 32, 33.
  • the first, the second and the third motor 31, 32, 33 also act upon a first, a second and a third zone 221, 222, 223 of the second support 22, respectively (by means of the interposition of additional components).
  • the first motor 31 acts upon the first zone 211 of the first support 21 and upon the first zone 221 of the second support 22.
  • the second motor 32 acts upon the second zone 212 of the first support 21 and upon the second zone 222 of the second support 22.
  • the third motor 33 upon the third zone 213 of the first support 21 and upon the third zone 223 of the second support 22.
  • the first support 21 is substantially quadrilateral (at least in a plan view).
  • the second support 22 is also substantially quadrilateral.
  • the first and/or the second support 21, 22 consist of a plate (they are therefore predominantly planar in extension).
  • the first and the second support 21, 22 are parallel to each other.
  • the first support 21 comprises a bed in which the first half-mould can be positioned.
  • the second support 22 comprises a bed to which said second half-mould is applied.
  • the bed of the first support 21 conveniently extends horizontally. This is repeatable for the second support 22.
  • the press 1 advantageously comprises a fourth electric motor, preferably a brushless motor.
  • This fourth motor can also be activated independently of the first, the second and the third motor 31, 32, 33.
  • the first, the second, the third and the fourth electric motor carry out their action for approaching and/or distancing movement in proximity to corresponding corners of the quadrilateral plate of the first support 21 and of the quadrilateral plate of the second support 22 or in proximity to points located along the perimeter of the first and the second support 21, 22. More specifically, they carry out their action in proximity to the vertices of the bed of the first and the second support 21, 22 or along the perimeter of the bed of the first and the second support 21, 22.
  • the press 1 comprises at least a first element 91 extending between the first and the second support 21, 22.
  • the element 91 comprises:
  • the first element 91 is activated by the first electric motor 31.
  • the first element 91 extends between and connects the first and the second support 21, 22.
  • the first element 91 enables the transmission of motion from the first electric motor 31 to the first and the second support 21, 22.
  • the first element 91 also enables conversion of rotational motion generated by the first electric motor 31 into substantially translational movement of the first and/or second support 21, 22.
  • the press 1 typically also comprises a second and a third element 92, 93 that extend between the first and the second support 21, 22 and that are activated by the second and the third motor 32, 33, respectively.
  • the press 1 advantageously also comprises a fourth element that is activated by the fourth electric motor.
  • the second element 92 (this can also be repeated for the third element 93 and possibly for the fourth element) comprises two threaded sections that mesh with the first and the second support 21, 22 and have an opposite handedness with respect to the first and the second support 21, 22 (in other words, rotation of the second element 92 in one case determines movement of the first support 21 towards the second support and movement of the second support 22 towards the first support 21 and in the other case, movement of the first and the second support 21, 22 away from each other.
  • the second element 92 comprises:
  • the approaching movement of the first and the second support 21, 22 implies that the first and the third element 91, 93 turn in one direction of rotation and that the second and the fourth element turn in an opposite direction of rotation.
  • the first, the second, the third and the fourth element extend in succession.
  • the first element 91 is a shaft connected to the first motor 31; moreover, it passes through the first support 21 in said first zone 211 of the first support 21 and is engaged in the first zone 221 of the second support 22.
  • the second element 92 is a shaft connected to the second motor 32; it passes through the first support 21 in said second zone 212 of the first support 21 and is engaged in the second zone 222 of the second support 22.
  • the third element 93 is a shaft connected to the third motor 33; it passes through the first support 21 in said third zone 213 of the first support 21 and is engaged in the third zone 223 of the second support 22.
  • the first, and the second and the third motor 31, 32, 33 are coaxial with the first, the second and the third element 91, 92, 93, respectively.
  • the first, the second and the third element 91, 92, 93 are predominantly longitudinal in extension. In particular, this predominantly longitudinal extension is vertically oriented.
  • first, the second and the third element 91, 92, 93 define a first, a second and a third column 41, 42, 43, which:
  • a fourth column 44 (coinciding with the fourth element indicated hereinabove) activated by the fourth electric motor and for which the remaining characteristics described previously for the first, the second and the third column 41, 42 and 43 also hold.
  • An object of the present invention is also a method in accordance with the features of claim 6.
  • the method comprises the step of moving a first and a second support 21, 22 towards each other, said supports 21, 22 being designed to support respective half-moulds.
  • the step of moving the first and the second support 21, 22 towards each other comprises the step of activating at least three electric motors 31, 32, 33 (which are advantageously brushless motors) acting at least upon three distinct zones of the first support 21 and that bring said three zones 211, 212, 213 of the first support 21 towards three corresponding zones 221, 222, 223 of the second support 22.
  • the step of moving the first and the second support 21, 22 towards each other provides that said at least three electric motors 31, 32, 33 act also at least upon said three distinct zones of the second support 22, determining a movement of the first support 21 towards the second support 22 and a movement of the second support 22 towards the first support 21.
  • Said at least three electric motors comprise at least a first, a second and a third motor 31, 32, 33.
  • at least a fourth motor preferably a brushless motor, is present.
  • the step of moving the first and the second support 21, 22 towards each other comprises the step of measuring the movement of the first and the second support 21, 22 towards each other, as brought about by the first, the second and the third motor 41, 42, 43.
  • This step advantageously takes place by means of respective encoders associated at least with the first, the second and the third electric motor 31, 32, 33.
  • an encoder is present and associated with (preferably incorporated in) each electric motor (which are advantageously brushless motors), enabling the movement of the first and the second support 21, 22 towards and/or away from each other.
  • the first motor 31 reverses its direction of rotation so as to correct at least partially a deviation between the approaching movement brought about by the first motor and the approaching movement brought about by the second or the third motor (therefore, there is a slight distancing movement of part of the first and the second support 21, 22).
  • the maximum allowable deviation (the pre-established threshold mentioned above) is very limited.
  • the maximum allowable deviation is set at a value of less than one tenth of a millimetre; advantageously, it is set at a value of less than 3 hundredths of a millimetre.
  • this deviation could be caused by greater resistance encountered by the first motor 31, this greater resistance being attributable to greater resistance of the material in the zone in which the first element 91 is acting.
  • the greater resistance of the material is typically caused by the shape of the first and the second half-moulds that can lead to a greater concentration of material closer to the zone of action of the first element 91, rather than the zone of action of the second or the third element 92, 93.
  • the step of moving the first and the second support 21, 22 towards each other after having corrected said deviation comprises activating at least the first, the second and the third motor 31, 32, 33 again, so that the first, the second and the third motor 31, 32, 33 perform a joint action of bringing the first and the second support 21, 22 towards each other. If a deviation greater than a pre-established value is found once again between the approaching movement brought about by one of the electric motors and the approaching movement brought about by one of the remaining electric motors, the electric motor responsible for said excess of approaching movement reverses its direction of rotation so as to correct said deviation (which is then brought back below said pre-established value).
  • the step of moving the first and the second support 21, 22 towards each other is thus repeated iteratively; advantageously the maximum allowable deviation remains unchanged for all the iterative cycles.
  • the pressing process for pressing a body present in the half-moulds is preferably a hot-pressing process.
  • the longer time at temperature of the material to be pressed facilitates its softening and therefore in the case in which a greater deviation from the predetermined threshold is detected, the material may be softer and thus more mouldable in the subsequent iteration.
  • the step of moving a first and a second support 21, 22 towards each other continues until a predetermined target point is reached (see Figures 3 and 4 , in which the press is closed, whereas Figures 1 and 2 show the press 1 in the open state).
  • the method subsequently comprises an adjustment, in which only part of said at least three motors 31, 32, 33 are activated for the purpose of changing the relative inclination of the first and the second support 21, 22.
  • the first and the second support 21, 22 are inclined with respect to the horizontal (in any case, the inclination is imperceptible).
  • This enables final adjustment of the pressing operation.
  • this operation makes it possible to execute a more substantial thrust at a zone in which the mould has a more "open" shape, while making it possible to push less where the mould is more "closed”.
  • planarity provides for maximum planarity to be maintained between the first and the second support of the half-moulds. This makes it possible to optimize machining accuracy, a requisite for a high quality product. Furthermore, the planarity also makes it possible to minimize possible mechanical problems that could arise in the case in which the first and the second support were to slide along their own guide means with an excessive deviation from the planarity.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Press Drives And Press Lines (AREA)

Claims (10)

  1. Presse de compression comprenant :
    - un premier support (21) adapté pour supporter un premier demi-moule ;
    - un second support (22) adapté pour supporter un second demi-moule, ledit second support (22) étant opposé au premier support (21) ; le premier et le second support (21, 22) pouvant être rapprochés et/ou éloignés l'un de l'autre ;
    - au moins un premier, un second et un troisième moteur électrique (31, 32, 33) qui commandent le mouvement du premier et du second support (21, 22) en rapprochement et en éloignement l'un de l'autre ; ledit premier, ledit second et ledit troisième moteur électrique (31, 32, 33) agissant dans une première, une seconde et une troisième zone (211, 212, 213) du premier support (21), respectivement ; le premier, le second et le troisième moteur (31, 32, 33) agissant également sur une première, une seconde et une troisième zone (221, 222, 223) du second support (22), respectivement ;
    - au moins une première, une seconde et une troisième colonne (41, 42, 43), qui :
    *connectent le premier et le second support (21, 22) ;
    *sont activées par le premier, le second et le troisième moteur (31, 32, 33), respectivement ;
    - des moyens de mesure du mouvement mutuel de ladite première, seconde et troisième zone (211, 212, 213) du premier support (21) respectivement vers la première, la seconde et la troisième zone (221, 222, 223) du second support (22) ;
    caractérisée en ce qu'au moins la première, la seconde et la troisième colonne (41, 42, 43) :
    i) transmettent le mouvement du premier, du second et du troisième moteur (31, 32, 33) à la fois au premier support (21) et au deuxième support (22) ;
    ii) fonctionnent comme des guides pour le premier et le second support (21, 22) pendant une course du premier et du second support (21, 22) en rapprochement et / ou en éloignement l'un de l'autre ;
    le premier, le second et le troisième moteur (31, 32, 33) sont configurés pour être activés indépendamment les uns des autres de telle sorte que si le mouvement d'approche provoqué par le premier moteur électrique (31) est supérieur à un seuil prédéterminé par rapport au mouvement d'approche provoqué par le second moteur (32), le premier moteur (31) inverse sa direction de rotation de manière à corriger au moins partiellement un écart entre le mouvement d'approche provoqué par le premier moteur (31) et le mouvement d'approche provoqué par le second moteur (32).
  2. Presse selon la revendication 1, caractérisée en ce que :
    - ledit premier support (21) consiste en une plaque sensiblement quadrilatérale ;
    - ledit second support (22) consiste en une plaque sensiblement quadrilatérale ; ladite presse (1) comprenant un quatrième moteur électrique ; le premier, le second, le troisième et le quatrième moteur électrique effectuant leur action pour un mouvement d'approche et/ou d'éloignement à proximité des coins correspondants de la plaque quadrilatérale du premier support (21) et de la plaque quadrilatérale du second support (22).
  3. Presse selon l'une quelconque des revendications précédentes, caractérisée en ce qu'elle comprend au moins un premier élément (91) s'étendant entre le premier et le second support (21, 22) et comprenant :
    - une première section (401) qui s'engrène avec le premier support (21) au moyen d'un premier filetage ; le sens de rotation du premier filetage étant tel qu'une première direction de rotation du premier élément (91) détermine un mouvement du premier support (21) vers le second support (22) ;
    - une seconde section (402) qui s'engrène avec le second support (22) au moyen d'un second filetage ; le sens de rotation du second filetage étant tel que le première direction de rotation du premier élément (91) détermine un mouvement du second support (22) vers le premier support (21).
  4. Presse selon la revendication 3, caractérisée en ce qu'elle comprend également un second et un troisième élément (92, 93) qui s'étendent entre le premier et le second support (21, 22) et qui sont activés par le second et le troisième moteur (32, 33), respectivement ; le premier, le second et le troisième élément (91, 92, 93) définissent la première, la seconde et la troisième colonne (41, 42, 43).
  5. Presse selon l'une quelconque des revendications précédentes, caractérisée en ce que le premier, le second et le troisième moteur électrique (31, 32, 33) sont sans balais.
  6. Procédé pour former un objet au moyen d'une presse de compression selon la revendication 1, comprenant l'étape de déplacer un premier et un second support (21, 22) l'un vers l'autre, lesdits supports (21, 22) étant conçus pour supporter des demi-moules respectifs ;
    ladite étape de déplacer le premier et le second support (21, 22) l'un vers l'autre comprenant l'étape d'activer au moins trois moteurs électriques (31, 32, 33) agissant au moins sur trois zones distinctes du premier support (21) et qui amènent lesdites trois zones (211, 212, 213) du premier support (21) vers des zones correspondantes (221, 222, 223) du second support (22), lesdits au moins trois moteurs électriques comprenant au moins un premier, un second et un troisième moteur électrique (31, 32, 33) qui peuvent être activés indépendamment les uns des autres ;
    dans lequel l'étape de déplacer le premier et le second support (21, 22) l'un vers l'autre prévoit que lesdits au moins trois moteurs électriques (31, 32, 33) agissent également au moins sur lesdites trois zones distinctes du second support (22), déterminant un mouvement du premier support (21) vers le second support (22) et un mouvement du second support (22) vers le premier support (21) ;
    l'étape de déplacer le premier et le second support (21, 22) l'un vers l'autre comprenant l'étape de mesurer le mouvement mutuel desdites trois zones (211, 212, 213) du premier support (21) vers les zones correspondantes (221, 222, 223) du second support (22) ; et dans lequel si le mouvement d'approche provoqué par le premier moteur électrique (31) est supérieur à un seuil prédéterminé par rapport au mouvement d'approche provoqué par le second moteur (32), le premier moteur (31) inverse sa direction de rotation de manière à corriger au moins partiellement un écart entre le mouvement d'approche provoqué par le premier moteur (31) et le mouvement d'approche provoqué par le second moteur (32).
  7. Procédé selon la revendication 6, caractérisé en ce que l'étape de déplacer le premier et le second support (21, 22) l'un vers l'autre après avoir corrigé au moins partiellement ladite déviation comprend l'activation d'au moins le premier, le second et le troisième moteur (31, 32, 33) à nouveau de sorte que le premier, le second et le troisième moteur (31, 32, 33) effectuent une action conjointe consistant à amener le premier et le second support (21, 22) l'un vers l'autre.
  8. Procédé selon la revendication 6 ou 7, caractérisé en ce que le procédé de pressage d'un corps présent dans les demi-moules est un procédé de pressage à chaud.
  9. Procédé selon l'une quelconque des revendications 6 à 8, caractérisé en ce que l'étape de déplacer un premier et un second support (21, 22) l'un vers l'autre se poursuit jusqu'à ce qu'un point cible prédéterminé soit atteint en termes de mouvement d'approche ; le procédé comprend ensuite un ajustement, dans lequel une partie seulement desdits au moins trois moteurs (31, 32, 33) est activée dans le but de modifier l'inclinaison relative du premier et du second support (21, 22).
  10. Procédé selon l'une quelconque des revendications 6 à 9, caractérisé en ce que le premier, le second et le troisième moteur électrique (31, 32, 33) sont sans balais.
EP16167361.1A 2015-04-30 2016-04-27 Presse de compression et son utilisation Active EP3088172B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITPR20150032 2015-04-30

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EP3088172B1 true EP3088172B1 (fr) 2021-11-03

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008260041A (ja) * 2007-04-12 2008-10-30 Hoden Seimitsu Kako Kenkyusho Ltd プレス装置

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1574266A (fr) * 1968-07-04 1969-07-11
CH488557A (de) * 1968-08-29 1970-04-15 Hiller & Lutz Fa Spindelpresse
SE434925B (sv) * 1980-05-06 1984-08-27 Inst Verkstadstek Forsk Ivf Pelarburen bearbetningsenhet
JP3689010B2 (ja) * 2001-03-15 2005-08-31 株式会社放電精密加工研究所 プレス機
JP4402863B2 (ja) * 2002-02-14 2010-01-20 株式会社放電精密加工研究所 プレス機
JP4551144B2 (ja) * 2004-07-12 2010-09-22 新日本製鐵株式会社 ホットプレス方法
JP4995415B2 (ja) * 2004-09-09 2012-08-08 株式会社放電精密加工研究所 プレス装置
JP4833695B2 (ja) * 2005-03-15 2011-12-07 新日本製鐵株式会社 プレス機械

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008260041A (ja) * 2007-04-12 2008-10-30 Hoden Seimitsu Kako Kenkyusho Ltd プレス装置

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