• 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:
    A method of controlling or controlling an injection molding machine, wherein plastic melt is filled into a cavity and, upon complete filling of the cavity by a pressure medium, pressure is applied to the melt in the cavity in a controlled or controlled manner, wherein the controlled or regulated application of the pressure by the pressure means a desired profile, wherein the first derivative and the second derivative of the pressure exerted by the pressure medium are limited by the specification of upper and lower limits.
    公开号:AT514232A1
    申请号:T3212013
    申请日:2013-04-18
    公开日:2014-11-15
    发明作者:Hannes Dipl Ing Bernhard
    申请人:Engel Austria Gmbh；
    IPC主号:
    专利说明:

    · ≫ ···· ·· ···· ···· ··· »• · · · 72038 36 / fr
    The invention relates to a method for controlling or regulating an injection molding machine having the features of the preamble of claim t,
    The patent DE 10 2004 051 109 B4 from Siemens describes a method for the improved switching to the reprinting by extrapolation. It also gives a setpoint specification at the beginning of the reprint.
    The patent (paragraph [14]) mentions that there is no abrupt changeover of the setpoint, but instead a nominal value transfer takes place with a defined pressure gradient normal to one profile step. Starting from the starting setpoint value, a setpoint value is determined by means of a gradient curve. linearly approximate to the pressure level. (Para. [17])
    In claim 5, it is very generally stated that the setpoint values are determined by means of a function between the starting setpoint and the final setpoint. In the description, for example, a gradient curve or pressure-time profiles with defined pressure gradients dp / dt are given, see Abs [51], [55], FIGS. 3, 4, and 7.
    In order to enable highly dynamic injection movements, which also meet the highest demands in terms of running smoothness and service life, an optimized planning of the trajectory for the injection phase, the
    Repressurization phase and specially required for the transition. In addition to the part of the speed-controlled injection movement, a dynamic and smooth course of the machine is essential, even in the pressure-controlled sewing pressure phase.
    In order to control or regulate the emphasis, one sets a certain theoretical nominal profile available from the one hand, which ideally would be traversed very precisely. This theoretical profile usually consists of consecutive constant pressure values or linear ramps. In practice, therefore, the transitions of this specification can only be followed with deviations.
    In order to achieve high dynamics with short acceleration times and steep pressure increases, there are ideally sudden changes in the 2/17 .. *. ..μ .. 72038 36 / fr • · · · «« · · · · · # # # # 2 # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # ·· M ······· · maximum torW forces required by the drive system. However, these requirements sometimes call inadmissible stresses on the i. A. elastic and / or play driven drive train out. These impermissible stresses are manifested by vibrations of the drive train, audible impacts and noise. The behavior leads in consequence to shorter life due to the resulting load peaks in individual machine elements such. B. bearings or spindles.
    In order to achieve a gentle and low-wear movement in the prior art gentler courses of the resulting trajectories are necessary. In the injection and the hold-pressure phase, this can be achieved when using a control, for example by reducing the controller gain of the controller or a subordinate control loop such as torque controller or speed controller. This has the disadvantage that thereby the controller behavior is deteriorated and the control deviations increase.
    In practice, the change of the setpoint is limited by the specification of maximum ramps. In order to obtain a smooth resulting movement, the necessary limitation leads to a noticeable reduction of the possible pressure change, clearly below the dynamics possible by the drive.
    Another option is to smooth the setpoints with a low pass filter. However, the filter will spill the webs, resulting in deviations from the original specifications.
    A further disadvantage of the variant is that the maximum value of the resulting derivatives depends on the original desired values and therefore can not be determined in advance in advance.
    The prior art mentions the use of sample times of less than 100 microseconds. Precisely here, it makes sense to define pressure specifications as smoothly as possible in order to generate meaningful and realizable nominal values and to be able to realize precise and dynamic control in rigid drive systems such as electrically operated injection molding machines with spindle drives (as opposed to hydraulic drive). 3/17 • · · · · · · · · · · · · · · · · · ·
    • «· · ··· ft, t ··· 72038 36 / fr
    The object of the invention is to avoid excessive loads on the injection molding machine with optimum use of the available driving forces or moments and the maximum speed to achieve short filling times of the cavity.
    This object is achieved by a method according to claim 1. Advantageous embodiments are defined in the dependent claims.
    The invention provides a way to equalize the deviations discussed above as fast as possible, but within the limits of the system, to the ideal set point bias.
    According to the invention, this takes place in such a way that the first and second discharges of the pressure (eg plasticizing screw or separate injection piston) are restricted in the form of upper and lower limits, which of course will be tried so close to the limits to stay as possible in order to be able to achieve the fastest possible adjustment to the ideal trajectory of the print.
    With the invention, taking into account the system limits, a realizable specification of a pressure can be generated, so that the drive system can follow the specification, without being within a limitation such as the speed limit or the torque limit. As soon as it is in a limit, the error and thus occurring fluctuations can no longer be compensated. This has a detrimental effect on the quality of the parts produced.
    With the invention, the requirements of high dynamics and a smooth running of the machine are met, which also have positive effects on the control and thus on the quality of the parts.
    In order to obtain a harmonic motion, it may be desirable to comply with further restrictions, in particular the third derivative of the pressure exerted by the pressure medium. As a physical meaning, the third derivative of the pressure corresponds to a change in torque / force change of the drive, 4/17 .. ........ ........ 72038 36 / fr mm · · λ mmmmmmmm «· ·· · · · · · · · · ·: · * ···········································
    These too are limited in real systems.
    In the invention, in addition to the transition from the switching point to the emphasis and the transitions between individual Nachdruckstufen or profile sections are taken into account. The pressure profile is determined so that this predetermined limits of the first, second and possibly third derivative of the pressure exerted by the pressure medium pressure.
    As a special embodiment, the second derivative of the pressure could be limited depending on the pressure, background of this idea is that at a higher pressure already more moment is needed in the static state and for the acceleration of the drive of the pressure medium for a pressure build-up less torque is available. In contrast, more pressure is available to allow for more momentum, and the system (the available powers and moments) can be better utilized. Similar relationships can also be used for the other restrictions.
    One way to preserve the Soil Profile is to assemble it from a variety of contiguous, piecewise-defined functions.
    By specifying or calculating the parameters of the functions based on the boundaries in the individual sections and the joining together, the entire profile can be determined.
    The limitations of the derivatives of the pressure can also be realized, for example, by means of suitable filters. It is generally known that (preferably based on a stepped specification) n derivatives can be delimited by means of n filters carried out in succession. Other possibilities are conceivable and known to the person skilled in the art.
    Further advantages and details of the invention will become apparent from the figures and the associated description of the figures. 5/17 ··························································································································· 4. : ·: T • • · ·· '·· ·· »· ·» · • · · · l 72038 36 / fr
    Figure 1 shows a transfer of two sections in reprint with different pressure level, where according to an embodiment of the invention, the first three derivatives of the setpoint are limited. The pressure curve (p) in the uppermost diagram, as well as the first dp / dt and the second derivative d2p / dt2 of the nominal pressure are shown in the lower sketches.
    Until the beginning of the transfer, a first stage of reprint 2 is effective. The time range of the transfer of the target pressure is indicated by the vertical line. At the first marking begins the setpoint transfer 1, which is shown with the corresponding leads 1a and 1b. The permissible limits of the derivatives of the setpoint transfer 2a, 2b are also shown. These are exactly reached here during the transition. In areas where the second derivative has a constant slope, the third derivative is within the given upper or lower limit. The transfer of the setpoint ends in a second stage of reprinting. 3
    For the Nachdruckstufen each of the derivatives are shown 2a and 2b
    In the selected representation, the amount of the upper and lower limits has the same value. In a preferred embodiment, the amounts of the upper and lower limits may have different values, or may be predetermined by, for example, a pressure-dependent function.
    In this figure, the pressures in the individual sections, between which the desired value is transferred, are each constant. In a further embodiment, the pressures in the two sections can also boil up constant slopes.
    The following figures show several different transfers from the injection pressure to the emphasis. In the figures, the pressure profile, as well as the first and the second derivative of the target pressure are shown.
    FIG. 2 shows the transition from the injection pressure to a constant pressure profile. In the switching point, the current curve of the injection pressure can be represented by a straight line 6/17 72038 36 / fr ··· «· # ·« ··: · '··· ··· ♦ •' ·: · ·. · »· · ♦»;. ·································································································································································. As a result, the slope of the pressure coincides with the linear approximation at the switchover point. The transfer reference value in this embodiment is based on the current actual pressure value. Furthermore, the first derivative of the transfer setpoint starts with the current slope of the pressure. At the beginning of the transfer, the second derivative of the pressure is in the limit. Then the limit of the first derivative is reached. Again, before the transfer setpoint reaches the preset profile, the second derivative limit becomes effective. The time of switching is indicated by the vertical line TU. At this point, the transfer target value 1 starts from the reprinting shown with the corresponding derivatives 1a and 1b. The permissible limits of the derivatives of the transfer target value 2a, 2b are also shown. The predetermined reprinting profile 3 begins with the switching point.
    Furthermore, time derivatives of the reprinting profile 3a and 3b are shown. The first part of the curve shows the pressure curve before reaching the switching point 5. Furthermore, a linear approximation of the pressure curve 6 and the associated first derivative 6a and second derivative 6b are shown in the switching point.
    FIG. 3 shows a transfer from the injection pressure to the holding pressure. In contrast to the previous figure, the limit of the first derivative is not reached here.
    FIG. 4 shows a transfer from the injection pressure to a falling setpoint pressure value.
    5 shows a further preferred embodiment of the transfer to the reprint is shown, wherein in addition to the limitation of the first two derivatives of the setpoint and the third derivative is limited. This is visible in the limited slope of the second derivative. By this measure, the transfer is even more harmonious. Analogous to this representation, a desired pressure transfer of two sections in the reprint with different slopes can be achieved. 7/17 44 4 4 4 44 4 4 4 444: 4:: 4 4 4 4: • «4 4 4 4 '4 4 4 4 4 4 4 * 7 4 4 44. , 4 4 '4 4 4 m 4 4 4 4 4 4 4 4 4 4 4. 4 4 4- 4 4 44 444 4 44 4: «72038 36 / fr
    As a special embodiment, the second derivative of the pressure could be limited depending on the pressure. FIG. 6 shows a pressure-dependent 7 and a pressure-independent 8 limit value for the second derivative. Background of the idea is that more torque is already required in the static state at a higher pressure and less torque is available for the acceleration of the drive for pressure build-up. In contrast, more pressure is available to allow for more momentum, and the system (the available powers and moments) can be better utilized. Similar relationships can also be used for the other boundaries.
    Innsbruck, on April 17, 2013 8/17
    权利要求:
    Claims (9)
    [1]
    72038 36 / fr • · · · · · · · · · · · · · · · · · · · ··············································································· 1. A method for controlling or regulating an injection molding machine, wherein plastic melt is filled into a cavity and after complete filling of the cavity by a pressure medium in a controlled or controlled manner pressure is exerted on the melt located in the cavity , wherein the controlled or controlled exertion of the pressure by the pressure medium according to a desired profile, characterized in that the first derivative and the second derivative of the pressure exerted by the pressure medium by the specification of upper and lower limits are limited.
    [2]
    2. The method according to claim 1, characterized in that the third derivative of the pressure exerted by the pressure medium is limited by the specification of upper and lower limits.
    [3]
    3. The method according to any one of claims 1 or 2, characterized in that the upper and / or lower limit (s) for the second derivative of the pressure depending on the pressure is / are selected.
    [4]
    4. The method according to any one of claims 1 to 3, characterized in that the upper and / or lower limits of the second derivatives of the available driving forces or torque are calculated.
    [5]
    5. The method according to any one of claims 1 to 4, characterized in that the upper and / or lower limits of the first derivatives are calculated from the available maximum speeds.
    [6]
    6. The method according to any one of claims 1 to 5, characterized in that the Soliprofil is transferred when transferring injections to reprint, starting from the current pressure and its derivatives in the switching to the specification of the pressure in the reprint with the limitation of the derivatives.
    [7]
    7. The method according to any one of claims 1 to 6, characterized in that the desired profile is composed of a plurality of juxtaposed, piecewise defined functions. 9/17 • * • • • • • • • • * 72038 36 / fr ······ tM
    [8]
    8. The method according to any one of claims 1 to 7, characterized in that the desired profile at each time of the reprinting either the pressure specification of the operator corresponds, or is one of the derivatives of the desired profile in the upper or lower limit.
    [9]
    9. The method according to any one of claims 1 to 8, characterized in that the desired value and one or more derivatives of the desired value for a regulation of the pressure in the reprinting be used. Innsbruck, on April 17, 2013 10/17
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    同族专利:
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    DE4140392A1|1991-12-07|1993-06-09|Robert Bosch Gmbh, 7000 Stuttgart, De|Control of thermoplastic injection moulding process - uses sudden rise in pressure signalled by sensor in mould space to indicate end of filling phase, improving prod. quality|
    DE102004051109B4|2004-10-19|2007-01-18|Siemens Ag|Method for operating an injection molding machine|
    US8878479B2|2010-05-18|2014-11-04|Mitsubishi Electric Corporation|Motor control device|
    AT510879B1|2010-12-27|2012-10-15|Engel Austria Gmbh|CONTROL AND / OR CONTROL DEVICE FOR CONTROLLING AND / OR REGULATING AN INJECTION PUNCH OF AN INJECTION MOLDING MACHINE|DE102017207586A1|2017-05-05|2018-11-08|Arburg Gmbh + Co Kg|CONTROL AND REGULATING THE PRESSURE OF A CYCLICALLY WORKING INJECTION MOLDING MACHINE|
    DE102019215841A1|2019-10-15|2021-04-15|Joyson Safety Systems Germany Gmbh|Airbag cover with partially foamed areas and method for producing such airbag covers|
    法律状态:
    2020-12-15| MM01| Lapse because of not paying annual fees|Effective date: 20200418 |
    优先权:
    申请号 | 申请日 | 专利标题
    ATA321/2013A|AT514232B1|2013-04-18|2013-04-18|Method for controlling or regulating an injection molding machine|ATA321/2013A| AT514232B1|2013-04-18|2013-04-18|Method for controlling or regulating an injection molding machine|
    DE102014005500.0A| DE102014005500B4|2013-04-18|2014-04-14|Method for controlling or regulating an injection molding machine|
    CN201410387375.8A| CN104275784B|2013-04-18|2014-04-17|Method for controlling or adjusting injection lding) machine|
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