Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
  • B29C45/17—Component parts, details or accessories; Auxiliary operations
  • B29C45/76—Measuring, controlling or regulating
  • B29C45/766—Measuring, controlling or regulating the setting or resetting of moulding conditions, e.g. before starting a cycle
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
  • B29C45/17—Component parts, details or accessories; Auxiliary operations
  • B29C45/76—Measuring, controlling or regulating
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
  • B29C45/17—Component parts, details or accessories; Auxiliary operations
  • B29C45/76—Measuring, controlling or regulating
  • B29C45/7646—Measuring, controlling or regulating viscosity
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
  • B29C2945/76—Measuring, controlling or regulating
  • B29C2945/76003—Measured parameter
  • B29C2945/7605—Viscosity
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
  • B29C2945/76—Measuring, controlling or regulating
  • B29C2945/76177—Location of measurement
  • B29C2945/7618—Injection unit
  • B29C2945/7621—Injection unit nozzle
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
  • B29C2945/76—Measuring, controlling or regulating
  • B29C2945/76344—Phase or stage of measurement
  • B29C2945/76381—Injection
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
  • B29C2945/76—Measuring, controlling or regulating
  • B29C2945/76494—Controlled parameter
  • B29C2945/76498—Pressure
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
  • B29C2945/76—Measuring, controlling or regulating
  • B29C2945/76655—Location of control
  • B29C2945/76658—Injection unit
  • B29C2945/76665—Injection unit screw

Definitions

• the invention relates to a setting method for the semi-automatic production of a processable basic setting for an injection molding machine for processing molding compositions of plastic, as specified in claim 1.
• the aim of this adjustment method is when using a new or changed combination of tool, material and injection molding as quickly as possible to find a process-ready initial setting or to achieve the most stable basic setting possible.
• the plastic injection molding process represents a direct and fully automatable way of producing a finished part from a raw material, generally requiring little or no post-processing of the molded part obtained and ensuring a high reproduction accuracy.
• An injection molding process enables cost-effective and rapid production from simple to extremely complex plastic parts in high and highest quantities.
• processable plastics such as thermoplastics, thermosetting plastics or elastomers, justifies the tremendous importance of the injection molding process in modern production technology, with injection molding processes frequently being regarded as the most highly developed processing processes in plastics processing.
• a preferably macromolecular work or plastic which is supplied by a raw material manufacturer usually as a powder or granules, transferred to a flowable state and pressed into a multi-part mold tool in which this molding material then solidifies and Molded part is removed or ejected after opening the mold tool.
• Numerous parameters and multi-layered dependencies of the various process variables of material, tool and machine result in a rather complex setting process, which is only of correspondingly high qualified personnel with sufficient reliability, safety and efficiency.
• the manufacturers of the injection molding machines often offer courses for the operators of the machine operators, in which different procedures for a successful initial setting are taught. The training of these operating personnel represents a not inconsiderable cost and time factor.
• the complete adjustment process of an injection molding machine is usually divided into a determination of a process-capable initial setting and a subsequent optimization of the initial setting during the ongoing injection molding process.
• the inventive method relates to the semi-automatic, guided and reliable as possible determination of a process or functional initial setting.
• the initial setting thus obtained is then the starting point for the subsequent optimization phase in the current process.
• the evaluations of the operator are used by the start-up assistant for the planned change of the operating parameters, so that the injection molding process gradually leads to molded parts with sufficiently good quality.
• the specifications and adjustments made by the start-up assistant are based on recommendations of the material manufacturer, the machine manufacturer as well as on underlying physical relationships and models for sub-processes of the injection molding process.
• the scope of the data to be provided by the operator, the effort required to assess and evaluate the parts produced on a trial basis as well as the required specialist knowledge about the parameterization of the injection molding process are thus reduced by the technical specifications or support of the startup assistant.
• An advantage resulting from the procedure according to the invention lies in the fact that a basic setting can already be found after a short period of time, which ensures a higher quality of the molded parts produced with relatively high reliability.
• the large, generally possible value range of the flow behavior, in particular the viscosity, of the workable plastics or molding compositions was identified. Since these are so-called pseudoplastic materials, this viscosity is not merely dependent on the mass or the processing temperature of the materials or molding material, but is the flow behavior or the viscosity of the molding composition, especially of the respective present or chosen Discharge or flow rate, ie dependent on the injection rate of the molding material.
• the flow behavior in particular the viscosity of the plastic melt, which is as free as possible from external influences, is achieved.
• at least one injection process is carried out only through the nozzle into the open, ie without an attached mold tool, even before the start of the sample production cycles with the tool attached. From the occurring flow rate, the measured back pressure at the nozzle and from the geometry of the nozzle, a parameter for the viscosity of the material mass is then obtained or calculated. This viscosity parameter is then used to adjust the output values and / or the iteration step sizes for subsequent sample manufacturing cycles.
• the measures according to claim 3 and / or 4 a reliable detection of the melt viscosity and the respective flow behavior of the plastic melt can be achieved.
• the respectively required sensor systems or detection means for detecting the corresponding parameter values are extremely functionally reliable.
• no separate or no additional measuring means are to be implemented in order to be able to determine the respective present viscosity of the plastic melt at least approximately by calculation.
• a relatively short-term successful setting process or a setting procedure with relatively few iteration cycles can also be achieved by the measures according to claim 6.
• good initial values are found for the subsequent sample cycles and a process-ready basic setting is thus produced as quickly as possible or with only a few sample cycles.
• a suitable limit value for the injection pressure is found without a larger number of iterative tests, in which the mold tool is completely filled during the adjustment phase on the one hand, but is also not oversprayed, so that no or only negligible burrs occur on the molded parts. It also ensures that no overuse or even damage to the mold tool occurs.
• the measures according to claim 10 ensure that only authorized operators can make changes or adjustments to the settings of the injection molding machine. As a result, impairments of property or quality losses due to improper manipulation of the settings are avoided. In addition, it is ensured that only appropriately authorized or instructed operators can perform the respective operating or Einstellmaschineen. Furthermore, this ensures a corresponding traceability, which results in increased responsibility for various changes in the machine settings.
• the measures according to claim 11 on the one hand, the probability of errors during the adjustment process can be reduced. In addition, it is thereby made possible to accelerate the setting process on the injection molding machine again.
• the operator retains the full decision-making power with regard to the procedure or scope of support recommended by the start-up assistant.
• the operator can decide at any time freely whether support by interaction with the startup assistant is required for the respective adjustment phase or not.
• assistance can be claimed only for those process phases in which such a process appears necessary.
• the start assist can be deactivated and, as a result, a faster progress in the setting procedure may be achieved.
• a practicable "exit possibility” is created, by means of which an operator can carry out an orderly abortion of the method when special circumstances occur, for example when detecting a mistake or error in the setting or configuration of the injection molding machine.
• a disadvantageous, rigorous shutdown of the start-up assistant by an operator which can lead to damage in complex injection molding machines and processes, thereby at least largely avoided.
• the measures according to claim 15 ensure that already proven or optimal process parameters are maintained and can be used if they continue to be regarded as most suitable. In addition, in the event of an unsuccessful completion of the adjustment procedure assisted by the startup assistant, previously used values or process parameters can be used at any time. Finally, the measures according to claim 16 are advantageous since this makes it possible to reduce the knowledge required by the operator about the material used to a correspondingly identified identifier.
• process parameters which are advantageous or restrictive for the processing of the respective material do not have to be read and entered from data sheets or tables of the manufacturer in a laborious and potentially error-prone manner, but are set automatically on the basis of the material code. The comfort, but also the efficiency with regard to finding a process-capable basic setting are thereby significantly increased. In addition, this also significantly reduces the likelihood of incorrect settings or incorrect operation.
• Figure 1 shows the structure and the essential components of an injection molding machine.
• FIG. 2 shows the plasticizing unit of an injection molding machine
• FIG. 3 shows an embodiment of a nozzle of an injection molding machine
• FIG. 4 shows a diagram comprising the parameters viscosity, injection pressure and average wall thickness of the molded part to be produced.
• FIGs. 1 and 2 the most essential components of a standard injection molding machine 1 for processing plastics are shown greatly simplified.
• Such an injection molding machine 1 for carrying out a plastic injection molding method has inter alia a machine bed 2, a closing unit 3 for opening and closing a clamped, multi-part mold tool 4 and a plasticizing unit 5, with which the raw material is taken from a storage container 6, is transferred to the flowable state and pressed through a nozzle 7 in the closed mold tool 4.
• the mold tool 4 is frequently heatable or coolable by means of a tempering or cooling device in order to enable the crosslinking process in the processing of elastomeric plastics or to effect an optimal or rapid solidification of the molding composition by cooling in the case of thermoplastics.
• the plasticizing unit 5 comprises a hollow cylinder 8 which can be heated in several zones.
• a worm shaft 9 which is rotatable and also displaceable in the longitudinal direction transports the plastic granules falling from the storage container 6 into the front section of the plasticizing unit 5.
• the material becomes to a certain, part by a heater 10, but above all melted by the friction heat occurring during transport, ie plasticized.
• the granules are not only conveyed by the worm shaft 9 but also sheared, as a result of which the plastic melts and gradually plasticises or homogenizes.
• the plasticized material accumulates in the front section, in particular in a nozzle prechamber 11 of the plasticizing unit 5, wherein at the same time the worm shaft 9 recedes towards the rear or opposite the nozzle 7 the plasticizing 5 increasingly distanced.
• the nozzle prechamber 11 or the nozzle 12 in this case represents a preferred detection section 12 for the temperature of the plastic melt and / or for the respectively occurring injection pressure of the plastic melt, ie the molding compound.
• the plasticized material is ejected through the nozzle 7 in the front portion of the plasticizing unit 5 and pressed into the mold tool 4 abutting the nozzle 7 until it is completely filled.
• the injection of the molding material is carried out by an initially speed-controlled, axial forward sliding of the worm shaft 9, wherein a non-return valve 13 at the front end of the worm shaft 9 prevents retraction of the molding material through the worm gear.
• the worm shaft 9 thus acts in the injection phase as a piston.
• the mold tool 4 is completely filled and it is switched by the speed-controlled, axial forward movement of the worm shaft 9 to a pressure-controlled movement, with only a relatively small way is covered, until the worm shaft 9 finally stops.
• This phase is referred to as a post-pressure phase, in which the shrinkage associated with the cooling or crosslinking of the molding compound in the mold tool 4 is compensated by further low Nachellen molding compound or by the solidification under pressure.
• This post-press phase is particularly important for the quality of the finished molded parts.
• the holding pressure phase is terminated as soon as the molding compound is solidified at least in the sprue of the mold tool 4.
• the axial pressure is switched off on the worm shaft 9, the nozzle 7 of the plasticizing unit 5 is closed and the forming tool 4 is separated from the nozzle 7 in order to prevent unwanted heat transfer from the nozzle 7 to the forming tool 4 during the remaining cooling phase to avoid.
• the cooling or crosslinking phase begins in which the molding in the mold tool 4 at least partially solidifies. After sufficient or complete solidification, the mold tool 4 is opened and the molded part removed or ejected. During the cooling phase, material is usually already melted again in the plasticizing unit 5 for the next production cycle. After closing the mold Tool 4 and the reapplication to the nozzle 7 of the plasticizing 5, the injection molding machine 1 is ready for the injection process of plasticized molding compound for the next molding or the next part series.
• the closing side of the injection molding machine 1 is to be considered, for example, the opening and closing of the mold tool 4, the ejector movement and the mold temperature control.
• the injection side of the injection molding machine 1, in particular the plasticizing unit 5 has a significant influence on the course of the injection molding process.
• the cylinder wall temperature, the movement of the injection unit and the times or parameter parameters during the injection and holding pressure phase are decisive.
• the focus of the adjustment method according to the invention is therefore in the determination and adjustment of those operating parameters, which significantly determine the process flow and thus the quality of the molded parts obtained.
• the settings are based on empirical values and guidelines of the raw material manufacturers as well as simple physical relationships for the description of individual sub-processes.
• the actually suitable setting values can not simply be predetermined, but are usually to be determined in an iterative process.
• An object of the adjustment method according to the invention Among other things, this involves the determination of these setting values with the least possible number of required iterations and thus the lowest possible number of test production cycles.
• the influencing variables melt temperature, mold temperature, metering stroke or metering volume, dynamic pressure, injection speed, switching point or switchover criterion to holding pressure, holding pressure, holding pressure time and cooling time must be investigated.
• a start assist 15 is implemented as a program module in its control device 14.
• This software engineering start-up assistant 15 is implemented in the manner of a so-called wizard, as it is known from many conventional computer-based application programs.
• the operator via a user interface, in particular via various input and output means 16 of the control device 14, for example via a screen with touch screen, gradually and systematically passed through the different phases of the initial setting.
• the control device 14 and / or the start assist 15 can be embodied as an integral part of the injection molding machine 1 and / or as structurally independent, possibly also as a central unit for a plurality of injection molding machines 1.
• the approach assistant 15 collects and determines essential data and characteristics about the injection molding tool used, in particular about the molding tool 4, the injection molding material used, in particular the plastic molding compound and possibly the basic operating data or modes of operation of the injection molding machine 1. These data or characteristics are partially entered by the operator and / or automatically determined by test operations.
• the corresponding setting method can be divided into several phases or sections:
• the name of the plastic material used and / or its trade name are entered by the operator, whereupon the adjustment ranges of the most important processing parameters or the resulting process limits recommended by the respective manufacturer are automatically imported into the startup assistant 15 from a stored material database become.
• the most important processing parameters include the demolding temperature, the mold temperature, the melt temperature, i. the temperature of the plastic melt, and the plasticizing rate, i. The speed or peripheral speed of the worm shaft 9.
• the amount of dynamic pressure to achieve sufficient melt homogeneity in plasticizing is also based on recommendations of the material manufacturer and is also dependent on the design of the worm shaft 9. If available, the normally valid for optimal values for the processing parameters preset or otherwise proposed by the startup assistant 15.
• the possible adjustment ranges can also be limited by the start-up assistant 15 as a function of the properties of the respective injection molding machine 1.
• Such restricting machine properties may be, for example, the maximum injection pressure or the maximum injection speed.
• Such tool-specific inputs are, for example, the average and the maximum wall thickness of the molded part to be produced and / or the mold tool 4 and optionally further geometric data of the molded part, and certain configurations and embodiments of the mold tool 4, such as whether it is a Execution with a so-called rod gate or with a hot runner acts.
• the approach assistant 15 checks for the presence of some key constraints and configurations. If an automatic check of individual criteria is technically not possible or not implemented, the operator must check the existence of these conditions and enter the result of this check in an input mask of the start-up assistant 15, for example in the form of a checklist. This ensures that important and possibly safety-relevant criteria are not overlooked or fulfilled.
• Such criteria are, for example, a correctly mounted mold tool 4, a correctly set mold protection to protect the mold tool 4 from closing when damaged, the
• the next phase of the adjustment process will be after any additional, conscious confirmation by the operator initiated.
• a series of machine operations or trial manufacturing cycles or part production cycles are carried out and the process variables determined and the identified quality features of the resulting moldings are used to determine suitable setting values or to determine adjustment parameters to be optimized for a process-capable initial setting.
• a so-called empty shot is first carried out by the plasticizing unit 5, i.
• a discharge of material takes place only through the nozzle 7 of the injection molding machine 1 into the free space instead of into the molding tool 4.
• the plasticizing speed i. the volume flow V and the pressure or pressure drop occurring at the nozzle are determined and, via the known geometry of the nozzle 7, the viscosity of the melt is calculated at least approximately.
• the melt discharge preferably the same temperature of the melt and the same injection speed control technology specified, which are also provided as output values for the subsequent trial manufacturing cycles with a correspondingly applied mold 4.
• the determination of the initial value for the injection speed is preferably in dependence on the average wall thickness of the molded part or the ratio of flow length to wall thickness of the molded part, if this is known.
• the pressure drop at the nozzle 7 can be determined as follows:
• the nozzle conductance k which is further required for calculating the viscosity ⁇ , is in relation to the exemplary nozzle geometry with a round cross section corresponding to FIG Representation in FIG. 3 as follows:
• the volume flow V can be determined via the plasticizing speed v s as follows:
• a suitable initial value will now be obtained from a diagram 17, as exemplified in FIG. 4, in particular from a corresponding data or parameter matrix, ie a table determined for the injection pressure, which is used for the subsequent phase for determining the molding volume.
• a table determined for the injection pressure which is used for the subsequent phase for determining the molding volume.
• the injection pressure or the pressure limitation to be set can be indicated as absolute pressure or as a percentage based on the maximum permissible pressure of the injection molding machine 1.
• the diagram 17 according to FIG. 4 qualitatively illustrates the content of such a table.
• the initial values for the injection pressure and for the pressure limitation, respectively, to be set for different average wall thicknesses d of the molded part are in percent of the maximum permissible or the maximum possible Injection pressure of the injection molding machine 1 as a function of the determined viscosity ⁇ registered the plastic melt.
• These values for the injection pressure are based on empirical worlds or these dependencies are preferably determined experimentally.
• the values in the diagram 17 or from the corresponding data-technical table thus flow into the start-up assistant 15 or into the mode of operation of the control device 14 in order to determine a suitable operating point, in particular injection pressure.
• This diagram 17 is to be regarded as absolutely exemplary and partially distorted.
• the plasticizing unit 5 or its worm shaft 9 is dosed to approximately 95% of the maximum possible metering path.
• plastic granules from the reservoir 6 is plasticized by the heated screw shaft 9 and transported into the section between the screw shaft 9 and nozzle 7, ie in the Düsenvor hamper 1 1, wherein the screw shaft 9 is simultaneously pushed backwards by the material transported to the front.
• the axial drive, in particular the sliding hydraulic of the worm shaft 9 counteracts the retraction of the worm shaft 9 a certain resistance and thus ensures a certain back pressure in the Düsenvorcomb 1 1.
• the position of the worm shaft 9 is monitored during the metering by the control device 14.
• the rotational movement of the worm shaft 9 is stopped.
• the rotational speed of the worm shaft 9 is usually based on information from the material manufacturer.
• the height of the injection pressure used is determined by control technology as a function of the previously determined viscosity ⁇ the mass and the minimum wall thickness of the molded part.
• the exclusive pressure control during the trial injection process ensures that the molding tool 4 is not "over-injected” despite unknown volume, ie that no burrs occur or that the mold tool 4 is not damaged by pressure peaks from the previously determined viscosity ⁇ of the plasticized plastic mass also ensures that the mold tool 4 is filled as completely as possible and the recording volume of the mold 4 to be determined is determined as accurately as possible, but without the mold 4 in this Determination of the intake volume to overspray.
• the end of the forward movement of the worm shaft 9 is detected. This can e.g. via a velocity gradient method. At the end of the forward movement, an at least extensive filling of the mold tool 4 is achieved and the approach assistant 15 determines the preliminary dosing path from the path of the worm shaft 9 that has been traveled in the axial direction. Furthermore, the approach assistant 15 sets the provisional switchover point for the emphasis phase as the starting point for the subsequent trial manufacturing cycles. Further details and variants of this step can be found in the introductory study paper.
• the approach assistant 15 attempts a gradual adaptation of the below-mentioned process parameters within the process limits specified by the injection molding machine 1, the molding tool 4 and the material:
• the increment of the changes made is preferably determined by a certain percentage of the margin between the possible and the recommended process limits.
• the change in the value of the respective parameter can be a defined, maximum percentage. Accordingly, a change in value with, for example, 20% of the span between the manufacturer-specified limits of minimum and maximum melt temperature can be defined.
• differently sized step sizes may also be provided.
• the step size of the adaptation can also be selected depending on the distance of the parameter value to a predetermined limit value. If, after a certain number of trial-and-error production cycles, a sufficient degree of filling is not achieved or no improvement is achieved, the setting procedure is aborted with an error message from the start-up assistant 15. Further details and variants of this phase can be found in the aforementioned study.
• At least one complete manufacturing cycle is performed with the previously determined process parameters including pressurization. That is, at the end of the injection process and during the cooling process in which a material shrinkage takes place, the viscous material is further pressed with a certain pressure in the mold tool 4 or nachge redesignt until the material in the sprue of the mold tool 4 finally freezes.
• the height of the initially selected reprint and the technically possible and recommended limits are based on information from the manufacturer of the injection molding machine 1 and / or the material.
• the required hold-up time is determined by the time to which the material in the runner is sufficiently solidified and closes with it. This time can be determined approximately from the so-called "cooling time equation":
• the approach assistant 15 changes to the next and final phase.
• the approach assistant 15 aborts the process with an error message.
• the inputs and operator actions of the operator, the parameters used to carry out the trial production cycles and the process variables determined thereby are stored in a log. Regardless of this, it may be expedient to detect an identity and / or authorization of the operator prior to the start of the setting process and to carry out the setting procedure by means of the start-up assistant 15 only if the authorization has been determined accordingly.
• the input of the information by the user concerning plastic material, mold tool 4 and / or injection molding machine 1 may include the electronic detection or read-out of machine-readable data carriers, in particular barcodes or transponders. It is also expedient if the adjustment method at least one point aborted by a command of the operator and the setting or Anfahrassistent 15 can be terminated prematurely.
• start assist 15 can be terminated prematurely by a command of an operator, with the start assist 15 being the one
• Sub-processes are still completed or executed, or by start-up assistant 15 those states are still made by which a damage-free shutdown and trouble-free recommissioning of the injection molding machine 1 is ensured.
• An effective measure is furthermore to continuously record the number of production cycles carried out in the test phase and to automatically abort the setting process when a predetermined maximum number of trial phases is exceeded without achieving a satisfactory production quality and to output an error message via the startup assistant 15. Furthermore, it is expedient to store existing or previously set process parameters via the start-up assistant 15 and to restore the stored process parameters in the event of premature termination of the setting process.
• a practicable measure also lies in the approach assistant 15 accessing a material database when determining suitable setting parameters and process limits and reading out one or more of the following variables as a function of a material designation or data record identification entered by the operator: the minimum and maximum melt temperature; the minimum and maximum tool temperature; the maximum demolding temperature; and the thermal conductivity of the plastic material.
• the exemplary embodiments show possible embodiments of the adjustment method or of the start-up assistant 15, wherein it should be noted that the invention is not limited to the specifically illustrated embodiments thereof, but rather various combinations of the individual embodiments are possible with each other and this variation possibility due to the teaching to technical action by objective invention in the skill of those working in this technical field expert. So there are also all conceivable variants which can be combined by combinations. individual details of the illustrated and described embodiments are possible, includes the scope of protection.

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• Engineering & Computer Science (AREA)
• Manufacturing & Machinery (AREA)
• Mechanical Engineering (AREA)
• Injection Moulding Of Plastics Or The Like (AREA)

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• 2008
  • 2008-11-21 AT AT18182008A patent/AT507593B1/de not_active IP Right Cessation
• 2009
  • 2009-11-12 EP EP09771652.6A patent/EP2358514B1/de active Active
  • 2009-11-12 WO PCT/AT2009/000429 patent/WO2010057231A1/de active Application Filing
  • 2009-11-12 KR KR1020117014334A patent/KR101645378B1/ko active IP Right Grant
  • 2009-11-12 CN CN200980152112.6A patent/CN102264526B/zh active Active

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