• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Two-plate closing unit for a forming machine for applying at least two mold parts with a closing force comprising a first platen (2) and a second platen (3) which are movable relative to each other, at least one pull rod (4), which the first platen (2 ) and the second platen (3) passes through and is movable relative to the first platen (2) and relative to the second platen (3), and a locking device (5), by means of which the at least one tie rod (4) with the first platen (2 ) and / or with the at least one piston-cylinder unit (6,7) can be locked, wherein at least one piston-cylinder unit (6,7) is provided, which is designed as part of a closing force device at least a part of Apply closing force and / or as part of a tool height adjustment, the at least one pull rod (4) relative to the first Formaufspa 2) to move and / or relative to the second platen (3), wherein the closing force device comprises an active material (8,9), which is adapted to at least a part under the influence of an electromagnetic field and / or a temperature change apply the closing force, and / or the tool height adjustment comprises an active material (8,9), which is designed to set under the action of an electromagnetic field and / or a change in temperature, a tool height defining expansion of the active material.
    公开号:AT519607A1
    申请号:T50063/2017
    申请日:2017-01-30
    公开日:2018-08-15
    发明作者:Dipl Ing Günter Schott (Fh)
    申请人:Engel Austria Gmbh；
    IPC主号:
    专利说明:

    Summary
    Two-plate clamping unit for a molding machine for applying at least two mold parts with a clamping force, comprising a first mold clamping plate (2) and a second mold clamping plate (3), which can be moved relative to one another, at least one pull rod (4) which holds the first mold clamping plate (2 ) and the second mold mounting plate (3) and movable relative to the first mold mounting plate (2) and relative to the second mold mounting plate (3), as well as a locking device (5) by means of which the at least one pull rod (4) with the first mold mounting plate (2 ) and / or can be locked with the at least one piston-cylinder unit (6, 7), at least one piston-cylinder unit (6, 7) being provided, which is designed to be part of a closing force device, at least part of the Applying the closing force and / or as part of a tool height adjustment, the at least one pull rod (4) relative to the first mold mounting nnplatte (2) to move and / or to move relative to the second platen (3), wherein the clamping force device comprises an active material (8,9), which is designed, under the action of an electromagnetic field and / or a temperature change at least a part to apply the closing force and / or the tool height adjustment comprises an active material (8, 9) which is designed to define an extension of the active material defining a tool height under the action of an electromagnetic field and / or a change in temperature.
    (Fig. 1) / 18
    77792 32 / gb / fr
    The present invention relates to a two-platen clamping unit for a molding machine with the features of the preamble of claim 1.
    Molding machines are understood to mean injection molding machines, injection presses, presses and the like.
    Generic injection molding machines of the prior art have a first mold mounting plate (for example movable relative to a machine frame), to which a part of a mold - usually a mold half - can be mounted. There is also a second mold clamping plate (then fixed relative to the machine frame), on which a further part of a mold can be mounted. Both mold clamping plates are penetrated by at least one pull rod, the version with four pull rods penetrating the mold clamping plates being used most frequently in practice.
    The at least one tie rod can be locked relative to the first platen by means of a locking device. That end of the at least one tie rod which passes through the second platen can have a piston part. Together with a cylinder, this forms a piston-cylinder unit. In the locked state, the piston-cylinder unit can exert a pulling force on at least one pull rod. As a result, the mold clamping force required, for example, for an injection molding process can be exerted on the tool parts via the mold mounting plates.
    From JP 2013-031956 A, a clamping unit in a two-plate construction is known, a magnetostrictive material being used to apply the clamping force. A split nut is used for locking in this publication. The split nut has an inner profile which interacts with an outer profile of the at least one spar when the split nut is closed. The following disadvantage occurs: While magnetostrictive materials can achieve a high force density, the change in length per unit length is very limited. Since the split nuts for locking cannot be locked at any position on the tie rods (in practice, grooves of the outer profile can be on / 18
    77792 32 / gb / for the at least one tie rod a few centimeters wide) will be a very long one
    Body made of magnetostrictive material required, which increases the overall length of the
    Closing unit increased. This is a disadvantage in itself and is exacerbated by the fact that a large amount of the relatively expensive magnetostrictive material has to be used.
    The object of the present invention is to provide a clamping unit for a shaping machine which has a construction which is less complex in comparison with the prior art.
    This object is achieved by a two-plate clamping unit with the features of claim 1.
    This is done by providing at least one piston-cylinder unit, which is designed to apply at least part of the closing force as part of a closing force device and / or to move the at least one pull rod relative to the first platen and / or as part of a tool height adjustment to move to the second platen, where
    the closing force device comprises an active material which is designed to apply at least part of the closing force under the action of an electromagnetic field and / or a change in temperature, and / or
    - The tool height adjustment comprises an active material which is designed to define an extension of the active material defining a tool height under the influence of an electromagnetic field and / or a change in temperature.
    Active materials of this type are characterized by a high force density and a high number of almost wear-free deformation cycles. Force density is a measure of the strength of a force that a unit volume material can exert. Since, for example, high clamping forces have to be achieved in injection molding processes, materials with a high force density are of course advantageous in terms of minimizing the installation space, provided the active material is used correctly.
    / 18th
    77792 32 / gb / fr
    The locking device can be designed as an outer profile on the at least one tie rod, which interacts with an inner profile on a split nut. The locking is then brought about by closing the split nut. In this case, the tool height adjustment according to the invention serves to match the position of the outer profile to that of the inner profile in the closed state of the mold, so that locking is possible. The position to be coordinated does not necessarily have to be the closed position of the molding tool. For example, during embossing, a position that is not completely closed - or another position in which a closing force is to be applied - can be the position to which the tool height adjustment is coordinated.
    The invention can be used in both horizontal and vertical two-plate clamping units.
    Advantageous embodiments of the invention are defined in the dependent claims.
    It can be provided that the active material, which is part of the closing force device, is a piezoelectric material (can be crystals, polymers or ceramics, for example), a shape memory alloy (can be crystals or polymers, for example), a magnetostrictive material and / or a is electrostrictive material.
    Piezoelectric materials and electrostrictive materials are materials that change their length due to the action of an electric field. Magnetostrictive materials change their length under the influence of a magnetic field. Shape memory alloys have phase transitions, with different solid phases with different shapes. The deformation occurring during the phase transition can lead to a change in length. The phase transition is brought about by a change in temperature.
    / 18th
    77792 32 / gb / fr
    It can be provided that the active material, which is part of the
    Closing force device is between the first platen and the
    Locking device is arranged.
    A piston part can be provided, which is completed by a cylinder to form the at least one piston-cylinder unit and which is preferably attached or molded to the at least one tie rod.
    It can be provided that the active material, which is part of the closing force device, is arranged between the cylinder and the first mold clamping plate and / or is arranged between the cylinder and the second mold clamping plate.
    It can be provided that the piston part is at least partially made of the active material that is part of the closing force device. The build-up of pressure in the piston-cylinder unit for building the clamping force can thereby be brought about or supported.
    It should be noted that the piston part does not have to be attached or formed at the end of the at least one pull rod. It can also be provided that the cylinder is partially or completely embedded in the first or the second platen or is thus made in one piece. In this case, essentially only that part of the first or the second platen serves for power transmission to a tool part, which is arranged between the cylinder and the tool half to be assembled.
    It can be provided that the cylinder is arranged on a side of the second platen facing away from the first platen.
    It can be provided that the active material, which is part of the tool height adjustment, is arranged in the at least one piston-cylinder unit.
    / 18th
    77792 32 / gb / fr
    Provision can be made for the active material arranged in the piston-cylinder unit to be a magnetorheological liquid which essentially solidifies magnetorheological liquid by exposure to a magnetic field. This prevents movement of the piston in the cylinder because the magnetorheological fluid - in the solidified state - is no longer compressible. This ultimately enables the closing force to be built up (for example by means of a further active material or a further hydraulic piston-cylinder unit).
    A translator can be provided which is designed to increase / reinforce a force effect and / or a spatial displacement effect of the active material. When increasing the spatial displacement effect, such a translator, for example, achieves a larger travel path than would be possible with the active material without a translator. A combination of increasing the force effect and increasing the spatial displacement effect can also be achieved, in which case, however, energy must then be supplied, which can of course also be done with the help of an active material.
    Four tie rods can preferably be provided.
    As a rule, the first platen will be a movable platen (with respect to a machine frame) and the second platen will be a fixed platen, i.e. it will be immovably mounted with respect to a machine frame. This can have the advantage that the cylinder of the piston-cylinder unit does not move during operation. The peripherals necessary for the hydraulics, such as a pump and a tank, as well as the lines leading to the (hydraulic) piston-cylinder unit can therefore be planned with greater design freedom. Of course, the first platen can also be a fixed platen.
    Protection is also sought for a molding machine with a two-platen clamping unit according to the invention.
    Further details and advantages of the invention result from the figures and the associated description of the figures. Show:
    / 18th
    77792 32 / gb / fr
    1 shows a section through a molding machine according to the invention in the region of the two-plate clamping unit and
    Figures 2 to 4 further embodiments of the invention
    Forming machines.
    The molding machine according to the invention shown in FIGS. 1 (in this case an injection molding machine) in the area of the two-plate clamping unit 1 has a first, movable platen 2 and a second, fixed platen 3. Both platen 2 and 3 are of four tie rods 4 interspersed. The tie rods 4 are movably mounted both with respect to the first platen 2 and the second platen 3.
    One locking device 5 is used to lock the tie rods 4 with the first platen 2. The locking devices 5 are each designed as split nuts. Inner profiles of the split nuts interact with outer profiles on the bars 4 in the closed state of the nuts, as a result of which the bars 4 are locked with the first platen 2.
    Piston-cylinder units 6, 7 are arranged on the side of the second mold mounting plate 3 which points away from the first mold mounting plate 2. The cylinder 7 of the piston-cylinder units 6, 7 is fastened to the second platen 3. The piston part 6 is fixed to the end of the tie rods 4 and runs in the cylinder 7.
    In the case of two-plate clamping units 1 of the prior art, after the locking by the locking devices 5, a pressurized hydraulic medium is introduced into the pillar-side chambers of the piston-cylinder units 6, 7, whereby the force application to the mold mounting plates 2, 3 is achieved.
    The exemplary embodiment according to FIG. 1 is characterized in that an active material 8 is provided between the locking devices 5 and the first platen 2. In this case, the active material 8 can be a piezoelectric material, a shape memory alloy, a magnetostrictive / 18
    77792 32 / gb / fr
    Material or an electrostrictive material. Of course, a device for influencing the active material 8 is normally necessary to achieve the application of force, but this has not been shown for reasons of clarity. Such a device can, for example, generate a magnetic field (magnetostrictive material), an electric field (electrostrictive material or piezoelectric crystal) or generate a current or cause a temperature change (shape memory alloy).
    In this embodiment, the piston-cylinder unit 6, 7 on the right not only serves to apply the closing force, but also to move the corresponding pull rod 4 in such a way that the locking device 5 locks with the pull rod 4 in such a way that when the two-plate clamping unit is closed 1 the different parts of a mold to be assembled (not shown) touch or have an intended embossing gap. The hydraulics for controlling the piston-cylinder unit 6, 7 can be designed to be less efficient and therefore less complex, since the active material 8 also builds up at least part of the closing force. This can go so far that the closing force is generated almost completely by the active material 8.
    Then the pressure present in the spar-side chambers of the piston-cylinder units 6, 7 no longer has to be built up by a hydraulic pump, as in the prior art, but only has to be maintained, which can be easily achieved, for example, by means of a check valve is. Of course, it is then still possible to move parts of stamping strokes for which no great force is required by means of the piston-cylinder unit 6, 7.
    Of course, it can also be provided to build up part of the closing force through the active material 8 between the locking device 5 and the first platen 2 and another part through the piston-cylinder unit 6, 7.
    / 18th
    77792 32 / gb / fr
    In the embodiment according to FIG. 1, the piston-cylinder unit forms the tool height adjustment and the active material 8 (in the figure on the left), possibly together with the piston-cylinder unit 6, 7, the closing force device.
    The embodiment of Figure 2 is analogous to that of Figure 1, with additional active material 8 between the second platen 3 and the piston-cylinder units 6, 7 and is part of the closing force device.
    The active material 8 between the second platen 3 and the piston-cylinder units 6, 7 also serves to generate part of the closing force. For this purpose, the active material 8 is supported on the cylinder 7 between the second platen 3 and the piston-cylinder unit 6, 7. Due to the hydraulic pressure in the bar-side chamber of the piston-cylinder unit 6, 7, a force is exerted on the tie rods 4, which contributes to the closing force. Of course, it is also possible to use the active material 8 only between the second platen 3 and the piston-cylinder unit 6, 7.
    The exemplary embodiment according to FIG. 3 is likewise analogous to the exemplary embodiment according to FIG. 1, with part of the piston part 6 being designed as an active material 8. In this arrangement too, the active material 8 can make a contribution to the closing force.
    A magnetorheological fluid 9 is arranged in the pillar-side chambers of the piston-cylinder units 6, 7. If the magnetorheological fluid 9 is subjected to a magnetic field, it solidifies, so that an effect similar to that occurs when the spool-side chambers of the piston-cylinder units 6, 7 are filled with a hydraulic fluid and the hydraulic fluid is prevented from escaping (for example by means of a check valve). Because of the application of a magnetic field, the magnetorheological fluid 9 becomes an essentially solid body and can no longer escape in this way.
    Of course, the active material 8, which forms part of the piston part 6, can be used independently of the use of the magnetorheological fluid 9.
    / 18th
    77792 32 / gb / fr
    As an alternative or in addition to the magnetorheological fluid 9 in the spar-side chambers of the piston-cylinder units 6,7 of the embodiment according to FIG. 3, magnetorheological fluid 9 can also be arranged in the other chambers of the piston-cylinder units 6,7. This can be used, for example, to (fine) position the piston. In addition, this makes it possible, for example, to generate a counterpressure when the pressure is reduced after the closing force is applied, in order to prevent jerky movements in the closing unit. In this context it should be mentioned that magnetorheological liquids can also be subjected to a magnetic field in such a way that they do not solidify, but only have an increased viscosity.
    FIG. 4 is an analogous embodiment to FIG. 3, wherein not only a part of the piston part 6, but the entire piston part 6 is designed as an active material 8.
    In the exemplary embodiments according to FIGS. 3 and 4, the active material 8 forms the closing force device between the locking device 5 and the first platen 2 together with the active material 8 of the piston part 6. The tool height adjustment is formed by the piston-cylinder unit 6, 7.
    Innsbruck, on January 30, 2017/18
    77792 32 / eh
    权利要求:
    Claims (13)
    [1]
    claims
    1. Two-plate clamping unit for a molding machine for applying at least two mold parts with a clamping force
    a first platen (2) and a second platen (3) which are movable relative to each other,
    - At least one tie rod (4) which passes through the first platen (2) and the second platen (3) and is movable relative to the first platen (2) and the second platen (3), and
    - A locking device (5), by means of which the at least one pull rod (4) can be locked with the first platen (2) and / or with the at least one piston-cylinder unit (6, 7), characterized in that at least one piston Cylinder unit (6, 7) is provided, which is designed to apply at least part of the closing force as part of a closing force device and / or to move the at least one pull rod (4) relative to the first platen (2) as part of a tool height adjustment and / or to move relative to the second platen (3), wherein
    - The closing force device comprises an active material (8, 9) which is designed to apply at least part of the closing force under the influence of an electromagnetic field and / or a change in temperature, and / or
    - The tool height adjustment comprises an active material (8, 9) which is designed to define an extension of the active material defining a tool height under the action of an electromagnetic field and / or a change in temperature.
    [2]
    2. Two-plate clamping unit according to claim 1, characterized in that the active material (8,9), which is part of the clamping force device, is a piezoelectric material, a shape memory alloy, a magnetostrictive material and / or an electrostrictive material.
    11/18
    77792 32 / eh
    [3]
    3. Two-plate clamping unit according to one of the preceding claims, characterized in that the active material (8,9), which is part of the clamping force device, is arranged between the first platen (2) and the locking device (5).
    [4]
    4. Two-plate clamping unit according to one of the preceding claims, characterized in that a piston part (6) is provided which is completed by a cylinder (7) for at least one piston-cylinder unit (6, 7) and which is preferably is attached to or molded onto the at least one tie rod (4).
    [5]
    5. Two-plate clamping unit according to claim 4, characterized in that the active material (8,9), which is part of the clamping force device, is arranged between the cylinder (7) and the first platen (2) and / or between the Cylinder (7) and the second platen (3) is arranged.
    [6]
    6. Two-plate clamping unit according to claim 4 or 5, characterized in that the piston part is at least partially made of the active material (8,9), which is part of the clamping force device.
    [7]
    7. Two-plate clamping unit according to one of claims 4 to 6, characterized in that the cylinder (7) on one of the first platen (2) facing away from the second platen (3) is arranged.
    [8]
    8. Two-plate clamping unit according to one of the preceding claims, characterized in that the active material (8,9), which is part of the tool height adjustment, is arranged in the at least one piston-cylinder unit (6,7).
    [9]
    9. Two-plate clamping unit according to claim 8, characterized in that the active material (8, 9) arranged in the piston-cylinder unit (6, 7) is a magnetorheological fluid (9), which magnetorheological fluid (9) essentially solidified by exposure to a magnetic field.
    [10]
    10. Two-plate clamping unit according to one of the preceding claims, characterized in that a translator is provided to increase a
    12/18
    77792 32 / eh
    Force effect and / or a spatial displacement effect of the active material (8,9) is formed.
    [11]
    11. Two-plate clamping unit according to one of the preceding claims, characterized in that four tie rods (4) are provided.
    [12]
    12. Molding machine with a two-platen clamping unit according to one of claims 1 to 11.
    Innsbruck, on January 30, 2017
    [13]
    13/18
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    Engel Austria GmbH 15/18 77792
    类似技术:
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    DE69125719T2|1990-11-30|1997-07-24|Toshiba Machine Co Ltd|MOLDING LOCKING DEVICE IN INJECTION MOLDING MACHINE|
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    JP5450523B2|2011-08-02|2014-03-26|株式会社日本製鋼所|Clamping device|
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    ATA50063/2017A|AT519607B1|2017-01-30|2017-01-30|Two-platen clamping unit|ATA50063/2017A| AT519607B1|2017-01-30|2017-01-30|Two-platen clamping unit|
    DE102018101930.0A| DE102018101930A1|2017-01-30|2018-01-29|Two-platen clamping unit|
    CN201810086097.0A| CN108372640B|2017-01-30|2018-01-30|Double-plate mold closing unit for molding machine and molding machine|
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