• 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:
    Control for an injection molding machine, with: - at least one input for input signals of at least one sensor for measuring the course of at least one process parameter of an injection molding process of an injection molding machine - a computing unit to which the input signals supplied via the at least one input can be fed - an output via which the Arithmetic unit setpoint signals for a setpoint curve of a closing force can be output for at least one actuator of the injection molding machine, the arithmetic unit being configured to determine from the curve of the at least one process parameter supplied via the input signals a curve of a driving force counteracting the closing force of a melt injected into a mold of the injection molding machine , wherein the computing unit is configured to calculate a setpoint curve of the closing force and setpoint signals for the calculated setpoint curve for the closing to output force via the output.
    公开号:AT521442A1
    申请号:T50600/2018
    申请日:2018-07-12
    公开日:2020-01-15
    发明作者:Bramberger Robert；Dipl Ing Egger Peter；Helmut Steinparzer Ing
    申请人:Engel Austria Gmbh；
    IPC主号:
    专利说明:

    The invention relates to a control for an injection molding machine with the features of the preamble of claim 1, an injection molding machine which has such a control or is connected to such a control via a data connection, and a method for calculating and specifying a closing force curve for at least one actuator Injection molding machine with the features of the preamble of claim 12.
    AT 514 856 B1 describes a method for determining the course of at least one process parameter of an injection molding process of an injection molding machine in the form of mold breathing. An optimal clamping force setpoint for the injection process is determined based on the determined mold respiration process.
    A manual, dynamic adjustment of the closing force by an operator is usually not provided for in injection molding machines. H. a fixed (unchanging over time) setpoint for the closing force is specified. Even if it were possible to specify a desired time-variable setpoint curve, the operator would lack the necessary information and specialist knowledge to set it. Any changes to the injection settings and the clamping force setpoint have an impact on this process (too little clamping force at the wrong time will cause the tool to overmold).
    A generic control for an injection molding machine and a generic method, in which a minimum value for the peak value of a closing force is automatically determined, can be found in DE 10 2012 018 749 B4. This is done by determining a kink in the closing force increase during injection, plotted against a target closing force. The clamping force setpoint is automatically reduced to the minimum necessary for the specific injection process. The ventilation of a cavity of the tool and the wear of the tool are improved.
    The object of the invention is to provide a controller for an injection molding machine, an injection molding machine which has such a controller or is connected to such a controller via a data connection, and / 15
    84176 36 / mv of a method for calculating and specifying a closing force profile for at least one actuator of an injection molding machine, in which the mechanical load on the tool of the injection molding machine is lower than in the prior art.
    This object is achieved by an injection molding machine having the features of claim 1, an injection molding machine which has such a controller or is connected to such a controller via a data connection and a method having the features of claim 12. Advantageous embodiments of the invention are defined in the dependent claims.
    In a control according to the invention, it is provided that the computing unit is configured to calculate a setpoint curve for the closing force and to output setpoint signals for the calculated setpoint curve for the closing force via the output.
    In a method according to the invention, it is provided that a course of a closing force is calculated from a course of at least one process parameter of an injection molding process of an injection molding machine, it being particularly preferred that the course of the closing force falls so after a peak value of the closing force and / or from a minimum value like this increases to a peak value of the closing force that the target values of the target value curve of the closing force lie between the peak value of the closing force and the determined curve of the lifting force.
    The peak value of the closing force can be present for a predetermined period of time.
    In this way, an unnecessarily long mechanical load on the mold of the injection molding machine due to a constant, excessive clamping force can be avoided, but it is ensured that the clamping force is large enough at all times to prevent undesired opening of the mold by the driving force. The setpoint curve for the closing force can be optimized for the entire duration of the injection process (injection and cooling phase). Since the calculation of the required setpoint course is done by the computing unit (automatically, so to speak), it is not necessary for an operator of the injection molding machine to make a desired /
    84176 36 / mv
    Specifies the setpoint curve manually. The closing force is dynamically adapted to the injection molding process, which reduces the wear on the tool and allows the ventilation of a cavity of the tool to be optimized.
    It is particularly preferably provided that the setpoint curve falls after a peak value of the closing force and / or rises from a minimum value to a peak value of the closing force such that the setpoints of the setpoint curve of the closing force lie between the peak value of the closing force and the determined curve of the lifting force.
    For example, the calculated setpoint curve after the peak value of the closing force can be monotonous at least over a sub-range (ie, there can be a constant setpoint curve over at least a sub-range after the peak value), preferably strictly monotonous (ie for any two setpoints S1, S 2 after reaching the peak value applies: S1> S 2 ) fall off.
    It is particularly preferably provided that the computing unit is configured to calculate a setpoint curve of the closing force, which increases from a minimum value to a peak value of the closing force in such a way that the setpoints of the setpoint curve of the closing force between the peak value of the closing force and the determined curve of the lifting force lie. In this way, an unnecessary mechanical load on the tool can be avoided even before the peak value of the closing force is reached.
    For example, the calculated setpoint curve before the peak value of the closing force can be monotonous at least over a sub-range (ie there can be a constant setpoint curve over at least a sub-range before the peak value), preferably strictly monotonous (ie for any two setpoints S1, S 2 before the peak value is reached applies: S1 <S 2 ) increase.
    The computing unit is particularly preferably configured to optimally adapt a setpoint profile of the closing force before reaching and / or after leaving the peak value to the specific profile of the at least one process parameter. In this way, the mechanical stress on the tool can be minimized.
    / 15
    84176 36 / mv
    If several process parameters are determined, the peak value may result at different times depending on the process parameter. In this case, the greatest available value is used as the peak value for the calculation of the setpoint curve of the closing force for each time.
    Examples of the at least one process parameter of an injection molding process of the injection molding machine are injection pressure and / or mold breathing. The determination of these process parameters is known from the prior art and therefore need not be described in more detail here.
    In one embodiment of the invention, it is provided that the computing unit is configured to optimize the course of the setpoint value for the closing force by taking into account a maximum possible increase in closing force for the injection molding machine. This means that only setpoint curves are output that can actually be implemented by the concrete injection molding machine.
    In one embodiment of the invention, it is provided that the control has a storage device for storing a calculated setpoint profile of the closing force or is in a data-transmitting connection with it, and the setpoint signals for the setpoint profile for the closing force can be output via the output as a function of the stored calculated closing force profile is.
    In one embodiment of the invention, it is provided that the computing unit is configured to take delay times of the injection molding machine into account when executing the output setpoint signals by shifting the course of the closing force over time. Such delay times can e.g. B. arise because the at least one actuator of the injection molding machine can only implement a predetermined clamping force buildup with a time delay.
    In one embodiment of the invention it is provided that the computing unit is configured to output the calculated setpoint curve for the closing force in the form of visualization signals for an operator. Optionally, the operator can change the calculated setpoint curve.
    / 15
    84176 36 / mv
    An injection molding machine according to the invention can have a controller according to one of the embodiments described above (the controller can then preferably be implemented in a machine controller of the injection molding machine) or can be connected to such a controller via a data connection (for example via a cloud).
    The injection molding machine is preferably a plastic injection molding machine and the injection process is an injection process of plastic melt.
    Embodiment:
    The determination of the required closing force curve is based on the curve of process parameters, such as. B. the injection pressure or mold breathing. Based on this, a closing force curve is calculated and used in a spray cycle.
    The built-up clamping force and thus the load on the tool is as low as absolutely necessary.
    Procedure:
    - Adjustment of spray parameters and closing force using known methods
    - Measurement of a time course of one or more process parameters with a limited number of measuring points (a few 100) and storage in the control device. This can e.g. B. only after a few production cycles of the injection molding machine. The measuring points do not have to be determined equidistant in time.
    - Calculation of the necessary closing force curve according to the principle that a peak value of the closing force setpoint - which corresponds to the closing force determined in step 1 - is required for the peak value of the process parameter curve, but lower setpoints of the closing force curve are sufficient before / and or after the peak value of the process parameter. For example, the closing force curve before and / or after the peak value can be calculated as a percentage of the peak value.
    / 15
    84176 36 / mv
    - Optimization of the closing force curve, e.g. B. by taking into account the maximum possible increase in clamping force (due to the injection molding machine) in the control device. This ensures the necessary closing force at all times.
    - Storage of the course in a storage device of the control device. Provision can be made to reduce this course to significantly fewer points (for example 20) than the ascertained.
    - Application of the course in the production cycle and representation for the operator. Optionally, the operator has the option to change the course.
    The prior art and an embodiment of the invention are discussed with reference to the figures. Show it:
    Fig. 1 shows a closing force curve according to the prior art
    Fig. 2 shows a closing force curve according to the invention
    3 shows a reduction in the data size of the closing force curve according to FIG. 2
    Fig. 4 shows the reduced mechanical stress on the tool by the
    invention
    5 shows the merging of the closing force curve with several process parameters
    1 shows a previously known closing force specification. A set clamping force setpoint (peak value that does not change over time) is built up before the start of injection and is reduced again after a cooling time during which the melt solidifies and, if necessary, aftercooling until it can be removed from the mold. Tool breathing is shown for illustration, but has not yet been associated with the closing force.
    In FIG. 2, the closing force requirement for each point in time is calculated based on a recorded process parameter (here: tool breathing). In addition, adjustments, e.g. B. due to the limited increase in clamping force made on the course. It can be seen that the course of the setpoint increases strictly monotonously until a peak value is reached, which is present over a certain period of time / 15
    84176 36 / mv and after exiting the peak value initially strictly monotonous, then monotonically falling.
    In Fig. 3, the required closing force requirement (setpoint curve) is stored and applied with a few points in the control device. The course is shown graphically to the operator.
    4 shows a representation of the reduced load on the tool. The tool is loaded less around the hatched area.
    5 shows the merging of the clamping force requirement based on several process parameters. The maximum of the individual closing force profiles is formed, the closing force setpoint applies between the peak values.
    权利要求:
    Claims (13)
    [1]
    claims:
    1. Control for an injection molding machine, with:
    - At least one input for input signals of at least one sensor for measuring the course of at least one process parameter of an injection molding process of an injection molding machine
    - A computing unit to which the input signals supplied via the at least one input can be fed
    - An output, via which setpoint signals for a setpoint profile of a closing force for at least one actuator of the injection molding machine can be output by the computing unit, the computing unit being configured to use the input signals of the at least one process parameter, a profile of a driving force counteracting the closing force of an in to determine a mold of the injection molding machine injected melt, characterized in that the computing unit is configured to calculate a setpoint curve of the closing force and to output setpoint signals for the calculated setpoint curve for the closing force via the output.
    [2]
    2. Control according to claim 1, wherein the computing unit is configured to
    to calculate a setpoint curve of the closing force, which drops after a peak value of the closing force such that the setpoints of the setpoint curve of the closing force lie between the peak value of the closing force and the determined curve of the lifting force and / or
    - To calculate a setpoint curve of the closing force, which increases from a minimum value to a peak value of the closing force such that the setpoints of the setpoint curve of the closing force lie between the peak value of the closing force and the determined curve of the lifting force
    [3]
    3. Control according to claim 2, wherein the arithmetic unit is configured to calculate a setpoint curve that decreases monotonically, preferably strictly monotonously, after leaving the peak value of the closing force at least over a partial range.
    9/15
    84176 36 / mv
    [4]
    4. Control according to claim 2 or 3, wherein the computing unit is configured to calculate a setpoint curve that rises monotonically, preferably strictly monotonically, at least over a partial area before the peak value of the closing force is reached.
    [5]
    5. Control according to at least one of the preceding claims, wherein the computing unit is configured to optimally adapt a setpoint curve of the closing force before reaching and / or after leaving the peak value to the determined curve of the at least one process parameter.
    [6]
    6. Control according to at least one of the preceding claims, wherein by means of the at least one sensor for measuring the course of at least one process parameter of an injection molding process of an injection molding machine, an injection pressure and / or mold respiration can be measured.
    [7]
    7. Control according to at least one of the preceding claims, wherein the computing unit is configured to optimize the course of the setpoint value of the closing force by taking into account a maximum possible increase in closing force for the injection molding machine.
    [8]
    8. Control according to at least one of the preceding claims, wherein the controller has a storage device for storing a calculated setpoint curve of the closing force or is in a data-transmitting connection with it and an output of the setpoint signals for the setpoint curve for the closing force via the output as a function of the stored calculated Closing force course is feasible.
    [9]
    9. Control according to at least one of the preceding claims, wherein the computing unit is configured to take into account delay times of the injection molding machine in the execution of the output setpoint signals by temporal displacement of the closing force curve.
    [10]
    10/15
    84176 36 / mv
    10. Control according to at least one of the preceding claims, wherein the computing unit is configured to output the calculated setpoint curve for the closing force in the form of visualization signals for an operator.
    [11]
    11. Injection molding machine which has a controller according to at least one of the preceding claims or is connected to such a controller via a data connection.
    [12]
    12. A method for automatically calculating and specifying a closing force profile for at least one actuator of an injection molding machine, characterized in that a profile of a closing force is calculated from at least one profile of at least one process parameter of an injection molding process of an injection molding machine.
    [13]
    13. The method according to the preceding claim, wherein a profile of a closing force is calculated, which drops after a peak value of the closing force and / or increases from a minimum value to a peak value of the closing force such that the setpoints of the setpoint profile of the closing force between the peak value of the Closing force and the specific course of the buoyancy.
    类似技术:
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    DE2836692A1|1979-03-08|METHOD AND DEVICE FOR REDUCING THE RISK OF DAMAGE CAUSED BY EXTRUSIONS AT THE PARTIAL JOINTS OF INJECTION MOLDS
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    AT394970B|1992-08-10|METHOD FOR INJECTION MOLDING THERMOPLASTIC PLASTICS
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    DE19808679C1|1999-07-08|Conversion of machine settings when transferring tools between incompletely compatible computer-controlled injection molding machines
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    同族专利:
    公开号 | 公开日
    CN110712345A|2020-01-21|
    DE102019118950A1|2020-01-16|
    AT521442B1|2021-07-15|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    DE2836692A1|1977-08-22|1979-03-08|Logic Devices|METHOD AND DEVICE FOR REDUCING THE RISK OF DAMAGE CAUSED BY EXTRUSIONS AT THE PARTIAL JOINTS OF INJECTION MOLDS|
    JPS6218234A|1985-07-17|1987-01-27|Mitsubishi Heavy Ind Ltd|Injection molding process|
    DE69026189T2|1989-11-01|1996-08-29|Sumitomo Heavy Industries|Injection molding process for CD disks or the like|
    DE102011013380A1|2010-03-09|2011-12-15|Sumitomo Heavy Industries, Ltd.|Injection molding machine and injection molding process|
    JP3918386B2|1999-11-29|2007-05-23|宇部興産株式会社|Method and apparatus for controlling mold clamping force of injection molding machine|
    JP5180357B1|2011-09-29|2013-04-10|ファナック株式会社|Mold clamping force setting method and mold clamping force setting device for injection molding machine|
    JP5661820B2|2013-01-15|2015-01-28|ファナック株式会社|Control device for injection molding machine having mold clamping force control function|
    AT514856B1|2013-09-30|2015-06-15|Engel Austria Gmbh|Method for monitoring tool breathing|
    AT514847B1|2013-09-30|2015-06-15|Engel Austria Gmbh|Method for determining a setpoint for a setting parameter|CN113001921A|2021-02-25|2021-06-22|北京化工大学|Method for setting optimal mold clamping force of toggle rod type mold clamping mechanism|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    ATA50600/2018A|AT521442B1|2018-07-12|2018-07-12|Dynamic adjustment of the clamping force|ATA50600/2018A| AT521442B1|2018-07-12|2018-07-12|Dynamic adjustment of the clamping force|
    CN201910622234.2A| CN110712345A|2018-07-12|2019-07-11|Dynamic adaptation of clamping forces|
    DE102019118950.0A| DE102019118950A1|2018-07-12|2019-07-12|Dynamic adjustment of the closing force|
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