JP5888817B2 - Plasticization simulation apparatus, plasticization simulation method thereof, and plasticization simulation program - Google Patents

Description

  Embodiments described herein relate generally to a plasticization simulation apparatus that calculates predetermined parameters in a screw type plasticizing apparatus, a plasticization simulation method thereof, and a plasticization simulation program.

  Conventionally, a simulation technique for simulating a plasticizing process by calculating physical quantities such as a resin temperature and a solid phase ratio of a resin material to be plasticized in a plasticizing apparatus having a mechanism for plasticizing a resin material such as a screw type extruder is known. It has been. As this type of simulation, steady analysis is widely performed in which continuous analysis is performed assuming that the screw continues to rotate (see Patent Document 1, Non-Patent Documents 1 and 2 below).

JP 2007-007951 A

Nippon Steel Works Technical Report No. 63 Engineering Principles of Plasticizing Extraction

  However, the actual screw type plasticizing apparatus is configured such that the screw continues to rotate when plasticizing the resin material, but the rotation of the screw is stopped in the process of mold closing and mold opening. That is, the screw type plasticizing apparatus performs an intermittent operation in which the screw rotates and waits repeatedly, and does not perform a continuous operation in which the screw continues to rotate. For this reason, the technique for performing the steady analysis as described above has a problem that the intermittent operation in which such rotation and standby are repeated cannot be analyzed.

  The present invention has been made to solve the above-described problems, and provides a plasticization simulation apparatus, a plasticization simulation method, and a plasticization simulation program capable of reproducing a cycle operation in which rotation and standby are repeated. With the goal.

  In order to solve the above-described problems, one embodiment of the present invention uses a resin physical property of a material used in a screw type plasticizing apparatus, operating conditions of the plasticizing apparatus, and configuration data of the plasticizing apparatus, and A plasticization simulation apparatus for performing physical quantity calculation processing for calculating at least one physical quantity among solid phase ratio, temperature, pressure, and plasticizing ability using a characteristic formula, a mass conservation formula, and an energy conservation formula, Using the first physical quantity calculation unit that calculates the physical quantity in the rotation state by the physical quantity calculation process, and the physical quantity calculated by the first physical quantity calculation unit, the screw characteristic formula, the mass conservation formula, and the energy conservation formula are used. And a second physical quantity calculating unit that calculates a physical quantity when the screw is stopped.

  Further, one embodiment of the present invention uses a resin physical property of a material used in a screw type plasticizing apparatus, operating conditions of the plasticizing apparatus, and configuration data of the plasticizing apparatus, and a screw characteristic formula, mass storage A plasticization simulation method executed by a plasticization simulation apparatus that performs a physical quantity calculation process for calculating at least one physical quantity among solid phase ratio, temperature, pressure, and plasticizing ability using an equation and an energy conservation equation, A first physical quantity calculating step for calculating a physical quantity in the rotation state of the first physical quantity by the physical quantity calculating process, and using the physical quantity calculated by the first physical quantity calculating unit, the screw characteristic formula, the mass conservation formula and the energy conservation formula are And a second physical quantity calculating step for calculating a physical quantity in a stopped state of the screw.

  Further, one embodiment of the present invention uses a resin physical property of a material used in a screw type plasticizing apparatus, operating conditions of the plasticizing apparatus, and configuration data of the plasticizing apparatus, and a screw characteristic formula, mass storage A plasticization simulation program for causing a computer to execute a physical quantity calculation process for calculating at least one physical quantity among a solid phase ratio, temperature, pressure, and plasticizing ability using an equation and an energy conservation equation, A first physical quantity calculation unit that calculates a physical quantity in a rotating state of the screw by the physical quantity calculation process, and a physical quantity calculated by the first physical quantity calculation unit, the screw characteristic formula, the mass conservation formula, and the energy conservation formula. Is used to function as a second physical quantity calculation unit that calculates a physical quantity in a stopped state of the screw.

  According to the present invention, it is possible to reproduce a cycle operation in which rotation and standby are repeated.

It is a schematic sectional drawing which shows the screw type injection molding machine simulated in this Embodiment. It is a block diagram which shows the hardware constitutions of the plasticization simulation apparatus which concerns on this Embodiment. It is a functional block diagram which shows the function structure of the plasticization simulation apparatus which concerns on this Embodiment. It is a flowchart which shows the plasticization analysis process which concerns on this Embodiment. It is a flowchart which shows an initial condition calculation process. It is a figure for demonstrating a 3 zone model. It is a flowchart which shows a non-stationary analysis process. It is a flowchart which shows a waiting | standby physical quantity calculation process. It is a figure for demonstrating measurement time and standby time. It is a figure which shows the cylinder temperature and melt pool over the whole calculation area | region of a screw in a certain time. It is a figure which shows the solid-phase rate and pressure over the whole calculation area | region of a screw in a certain time. It is a figure which shows the time change of the resin temperature and plasticization capability in case a cycle period in a certain calculation area | region is short. It is a figure which shows the time change of the solid-phase rate and plasticizing ability in case a cycle period in a certain calculation area | region is short. It is a figure which shows the time change of the resin temperature and plasticization capability in case a cycle period in a certain calculation area | region is long. It is a figure which shows the time change of the solid-phase rate and plasticization capability in case a cycle period in a certain calculation area | region is long. It is a figure which shows the case where a plasticization simulation program is applied to information processing apparatus.

  Embodiments of the present invention will be described below with reference to the drawings.

  In the present embodiment, as shown in FIG. 1, a hopper 1 into which a resin material is charged, a cylinder 2 for melting the resin material, a resin material is melted and kneaded, and the tip of the cylinder 2 (downstream side) A simulation apparatus that performs a plasticization analysis of a screw type injection molding machine 4 that includes a single-axis screw 3 that carries out unsteady operation that repeats rotation and standby will be described. The simulation apparatus according to the present embodiment calculates various physical quantities in the rotating state in which the screw 3 is rotating, and calculates each physical quantity in the stopped state in which the screw 3 is stopped based on the calculated physical quantity. Is. In this embodiment, an example of an injection molding machine will be described as an example of a plasticizing device. However, the present invention is not limited to this, and the present invention can be applied to a screw type extruder or a single screw type plasticizing device. The invention can be applied. Hereinafter, the details of the present embodiment will be described with reference to the drawings.

(Device configuration)
FIG. 2 is a block diagram showing a hardware configuration of the plasticization simulation apparatus according to the present embodiment. As shown in FIG. 2, the plasticization simulation apparatus 10 includes a CPU (Central Processing Unit) 11, a storage unit 12, an input unit 13, a display unit 14, and an HDD (Hard disk drive) 15.

  The CPU 11 executes various programs such as an OS (Operating System), a BIOS (Basic Input / Output System), and an application developed on the storage unit 12 to control the plasticization simulation apparatus 10. The storage unit 12 is a volatile memory such as a so-called RAM (Random Access Memory), and is used as a work area for a program to be executed.

  The input unit 13 receives an input from a user who uses the plasticizing simulation apparatus 10, and includes, for example, a mouse that is a pointing device for designating a specific position on the display, a character, a specific function, or the like. A keyboard in which a plurality of assigned keys are arranged. The display unit 14 is an output device such as an OS and a GUI (Graphical User Interface) of an application operating on the OS and a display for displaying an analysis result. With such an output device, for example, the physical quantity calculated as the analysis result is displayed in the form of a histogram. The HDD 15 is a so-called non-volatile storage area in which data such as various parameters used in plasticization analysis processing described later and various physical quantities calculated by the processing are stored.

(Functional configuration)
Next, the functional configuration of the plasticization simulation apparatus 10 will be described. FIG. 3 is a functional block diagram showing a functional configuration of the plasticization simulation apparatus according to the present embodiment. As illustrated in FIG. 3, the plasticization simulation apparatus 10 includes an acquisition unit 101, an analysis unit 102, a determination unit 103, and an output unit 104 as functions. These functions are realized by cooperation of the above-described hardware resources such as the CPU 11 and the storage unit 12.

  The acquisition unit 101 acquires various parameters necessary for calculating a predetermined physical quantity. Note that the parameter may be information manually input by the user, or may be acquired from the HDD 15 corresponding to the screw type injection molding machine 4 to be analyzed. The analysis unit 102 calculates various physical quantities as analysis values of the simulation based on the acquired various parameters. The determination unit 103 performs various determinations in the plasticization analysis processing, and the output unit 104 receives the calculation result of the analysis unit 102 and the determination result of the determination unit 103 and outputs the result to the display unit 14 and the HDD 15. is there.

(Processing operation)
Next, details of the operation of the plasticization simulation apparatus 10 will be described with reference to the drawings. FIG. 4 is a flowchart showing plasticization analysis processing according to the present embodiment. As shown in FIG. 4, in the plasticization analysis process according to the present embodiment, first, an initial condition calculation process for calculating a physical quantity as an initial condition used in the unsteady analysis process described later is executed ( S1). Thereafter, unsteady analysis processing for performing unsteady analysis is performed by calculating a physical quantity as an analysis result in the rotation and standby cycle using the calculated initial condition (S2), and this flow ends. .

  Next, details of the above-described initial condition calculation process will be described. FIG. 5 is a flowchart showing the initial condition calculation process. As illustrated in FIG. 5, first, the acquisition unit 101 acquires various parameters (S101, S102, S103). In step S101, data of resin physical properties, for example, model parameters of a viscosity fit function, resin physical properties such as density of solid and melt, specific heat, thermal conductivity, melting point, and heat of fusion are acquired. In step S102, operating condition data, for example, screw rotation speed, cylinder setting temperature, cylinder setting temperature boundary position, back pressure, screw position, calculation cycle number, mesh number, cycle time, purge time, metered resin amount, raw resin temperature (Initial value of resin temperature) and the like are acquired. In step S103, configuration data of the screw type injection molding machine 4, for example, cylinder diameter, screw diameter, screw groove depth, screw lead, flight width, flight clearance and the like are acquired. This configuration data is preferably each value in a plurality of calculation regions (each position of the screw 3) such as the tip portion of the screw 3 and the supply portion near the hopper 2.

  Based on the acquired parameters, the analysis unit 102 calculates the initial plasticizing ability, which is the initial plasticizing ability (weight plasticized in unit time: kg / h), and the measurement time (the screw 3 The time increment indicating the length of one step (one hour step) in which numerical analysis is performed during the continuous rotation time) (hereinafter referred to as a measurement time interval) and calculation of each physical quantity are performed (S104, S105). , S106). The specific calculation method of the plasticizing ability and each physical quantity described here will be described later.

  After the calculation of the physical quantity, the determination unit 103 satisfies the back pressure acquired as the operating condition by the acquisition unit 101 in which the tip pressure of the calculated physical quantity (the pressure in the region of the tip part of the screw 3 in the calculation region) is satisfied. It is determined whether or not to perform (S107). In this determination, when the tip pressure and the back pressure have an equal relationship, it may be determined that the tip pressure satisfies the back pressure, and the differential pressure between the tip pressure and the back pressure is equal to or less than a predetermined convergence value. In this case, it may be determined that the tip pressure satisfies the back pressure.

  When the tip pressure satisfies the back pressure (S107, YES), the output unit 104 stores each physical quantity calculated by the analysis unit 102 in the storage unit 12 or the HDD 15 as an initial condition used in the unsteady analysis process (S108). This flow ends. Examples of the physical quantity output here include resin temperature and solid phase ratio.

  On the other hand, when the tip pressure does not satisfy the back pressure (S107, NO), the analysis unit 102 performs the plasticizing ability increase / decrease process (S109), and again uses the changed value of the plasticizing ability to measure in step S105. Enter the time step. Here, the initial plasticizing ability is the object of the plasticizing ability increasing / decreasing process for the first time, and the plasticizing ability changed by the process is the object for the next and subsequent times. Therefore, the measurement time increment, calculation of each physical quantity, and increase / decrease in plasticizing ability are repeated until the tip pressure satisfies the back pressure. According to this initial condition calculation process, it is possible to shift to the unsteady analysis process in a state where the resin material has spread into the cylinder 2. The plasticizing ability increasing / decreasing process is a process of increasing / decreasing the plasticizing ability so that the tip pressure satisfies the back pressure, and the plasticizing ability is increased / decreased by different values based on the difference between the tip pressure and the back pressure. That is, a so-called convergence determination is performed in steps S107 and S109.

  Hereinafter, specific methods for calculating the plasticizing ability and the physical quantity will be described. First, a method for calculating the initial plasticizing ability will be described. The initial plasticizing capacity is indicated by the weight (kg / h) of the resin material per unit time, and is calculated using the screw characteristic formula expressed by the formula (1).

In this equation (1), Q: volume flow rate, A and B: coefficient, V _bz : movement speed in the resin flow direction, w: screw groove width, h: screw groove depth, φ: screw helix angle, η: resin viscosity, ∂P / ∂z: pressure change amount. The resin viscosity η in the formula (1) is obtained from the viscosity formula of the formula (2).

In the equation (2), η: resin viscosity, m, ε, _Tr and n: viscosity parameter, T: resin temperature, dγ / dt: shear rate. By introducing necessary parameters among the parameters acquired by the acquisition unit 101 into the equations (1) and (2), the initial plasticizing ability (kg / h) is calculated. The necessary parameters here are the screw rotation speed, cylinder diameter, screw diameter, screw groove depth, screw groove width, melt density, and the like shown in FIG.

  Next, a physical quantity calculation method will be described. In the present embodiment, the physical quantity calculated in step S106 includes a molten resin quantity, a resin temperature, a solid phase rate, a screw power, and a pressure. These physical quantities are calculated over the entire calculation area. These physical quantities are calculated using the plasticizing ability that has already been calculated, necessary parameters among the parameters acquired by the acquisition unit 101, the law of conservation of mass and the law of conservation of energy. In the present embodiment, this calculation is performed separately for each zone by introducing a three-zone model as shown in FIG. 6 following the Tadmor model. Specifically, the following formulas (3) and (4) are used for the solid bed 51 in which the resin material exists in the solid region in the region including the screw 3 and the flight 5 of the screw 3 shown in FIG.

In the equations (3) and (4), ρ: resin density, X: solid bed width, h: screw groove depth, δ _m : melt film thickness, H: enthalpy, v _sz : flow direction of the solid bed Moving speed, λ: heat of melting, m _f : melt flow rate on the melt film side of the solid bed, m _p : melt flow rate on the melt pool side of the solid bed, k _s : thermal conductivity of the solid resin, T _s : solid bed temperature Q _fs : heat flux from the melt film to the solid bed interface, q _ps : heat flux from the melt pool to the solid bed interface. The melt film thickness may be calculated, or a predetermined constant may be given.

  Moreover, the following (5) Formula and (6) Formula are used for the melt film 52 shown by FIG.

In the equations (5) and (6), ρ: resin density, X: solid bed width, δ _m : melt film thickness, H: enthalpy, v _fz : melt film flow direction velocity, v _fx : melt film scraping direction _{velocity, q fs:} heat flux from solid bed surface to the interior solid bed, _{k m:} melt thermal conductivity, _{T f:} melt film _{temperature, q Bf:} heat flux from the cylinder to melt the film, _{Q G:} melt Shear calorific value in the film, m _f : Melt mass flow rate on the melt film side of the solid bed.

  Moreover, the following (7) Formula and (8) Formula are used for the melt pool 53 where the molten resin shown by FIG. 6 accumulates.

In the equations (7) and (8), ρ: resin density, w: screw groove width, X: solid bed width, h: screw groove depth, H: enthalpy, v _pz : melt pool flow direction speed, [delta] _m: melt film _{thickness, q ps:} heat flux from the melt pool to the solid bed surface, _{k m:} melt thermal conductivity, _{T p:} melt pool _{temperature, v fx:} melt film scraping direction _{velocity, q Bp:} cylinder From the heat flux to the melt pool, Q ′ _G : Melt pool shear heating value, m _p : Melt pool side melt mass flow rate of the solid bed.

  The above-described equations (3), (5), and (7) indicate the energy conservation laws, and the equations (4), (6), and (8) indicate the mass conservation laws. Further, since the mass conservation law and the energy conservation law are divided into the solid bed 51, the melt film 52, and the melt pool 53, the melt mass flow rate is introduced so as to satisfy the mass conservation law and the energy conservation law. By introducing into these formulas the plasticizing ability that has already been calculated and the necessary parameters of the parameters acquired by the acquisition unit 101, the amount of molten resin, the resin temperature, the solid phase rate, the screw power The pressure can be calculated.

  Next, details of the above-described unsteady analysis process will be described. FIG. 7 is a flowchart showing the unsteady analysis process. As illustrated in FIG. 7, first, the acquisition unit 101 acquires initial conditions from the storage unit 12 or the HDD 15 (S201). After acquisition, the analysis unit 102 inputs a measurement time step (S202). The weighing time increment here is the same value as in step S105 because the plasticizing ability calculated in the initial condition calculation process is introduced for the first time (after step S201 but not after step S205). Entered. Therefore, this process may be omitted.

  After inputting the measurement time step, the analysis unit 102 calculates each physical quantity (S203). The physical quantity calculated here includes the molten resin amount, the resin temperature, the solid phase ratio, the screw power, and the pressure, as in step S106 described above, and is calculated over the entire calculation region. The calculation of each physical quantity is performed using the same mathematical formula as in step S106 described above, the necessary parameters among the parameters acquired by the acquisition unit 101 in step S101, and the already calculated plasticizing ability (immediately after the initial condition calculation process). And the plasticizing ability calculated as the initial condition) and the already calculated physical quantity are calculated. The already calculated physical quantity is immediately after the initial condition calculation process, and when the current cycle is 0 (when one cycle has not elapsed), the initial condition calculated by the initial condition calculation process is used. . On the other hand, when the current cycle is 1 or more, the physical quantity calculated in the previous cycle (physical quantity calculated at the end of the waiting time described later, in other words, the physical quantity calculated one step before) is used. The physical quantity used here is a resin temperature, a solid phase ratio, or the like.

  After the calculation of each physical quantity, the determination unit 103 determines whether or not the tip pressure satisfies the back pressure (S204). If the tip pressure does not satisfy the back pressure (S204, NO), the analysis unit 102 determines whether the plastic pressure is plastic. The increase / decrease process is performed (S205). Since the processes of step S204 and step S205 are the same as the processes of step S107 and step S109 described above, details thereof are omitted.

  When the tip pressure satisfies the back pressure (S204, YES), the determination unit 103 advances the time by one step, and determines whether or not the total plasticized resin amount has reached the metered resin amount (acquired in step S102). If it is determined (S206) and has not been reached (S206, NO), the process returns to step S203, and each physical quantity is calculated again. The time to be advanced here is an already inputted measurement time step. When one step time has advanced, the resin material moves at a speed calculated from the already calculated plasticizing ability and screw groove cross-sectional area shape. The resin material moves in the cylinder 2 by a distance obtained by multiplying the speed by the time for one metering time. Accordingly, the amount of resin moved (extruded amount) in the volume flow rate Q based on the plasticizing ability calculated in step S203 is the amount of plasticized resin in one step (the amount of sufficiently plasticized resin to be injected). ). Therefore, for each determination, the amount of plasticized resin in this one step is added, and the process returns to step S203 until the total amount of plasticized resin reaches the measured resin amount, and the calculation of each physical quantity is performed again. It is possible to grasp whether or not the measured resin amount is obtained.

  Note that the amount of plasticized resin is determined by adding to the current amount of plasticized resin before the determination is made, but if it is determined that the amount has not been reached (NO in S206), the amount of plasticized resin is added. You may be made to do. At this time, the resin material is sequentially supplemented by supplying the resin material from the hopper 1 on the base side (downstream side) of the screw 3.

  On the other hand, when the total plasticized resin amount reaches the measured resin amount (S206, YES), it is determined that the plasticization is completed, and the physical quantity at the end of the plasticization is stored in the HDD 15 and the standby is performed by calculating the standby time. A standby physical quantity calculation process for calculating a change in physical quantity during the time is performed (S207). Details of the standby physical quantity calculation processing will be described later. After the standby physical quantity calculation process, the determination unit 103 determines whether or not the current number of calculation cycles has reached a preset number of calculation cycles (acquired in step S102) (S208). YES), the output unit 104 outputs the calculated physical quantities to the storage unit 12, the HDD 15, the display unit 14, and the like, and this flow ends. For example, the output unit 104 outputs each physical quantity to an output file designated in advance for each calculation time interval or each calculation region (position) on the screw 3, and displays it on the display unit 14.

  On the other hand, if the number of calculation cycles has not reached the number of calculation cycles (S208, NO), 1 is added to the current number of cycles, and the process returns to step S203 to calculate each physical quantity based on the physical quantity at the end of the waiting time described later. Done.

Next, details of the standby physical quantity calculation processing will be described. FIG. 8 is a flowchart showing the standby physical quantity calculation process, and FIG. 9 is a diagram for explaining the measurement time and the standby time.
First, as illustrated in FIG. 8, the analysis unit 102 calculates a measurement time and a standby time (S301). As shown in FIG. 9, one cycle can be divided into weighing time and waiting time. When the measurement time is from the rotation start (plasticization start) having the plasticizing ability to the rotation stop (plasticization end) at which the plasticizing ability becomes 0, the time for one cycle has been acquired as the cycle time in step S102. Therefore, if the metering time is subtracted from the cycle time, it is possible to calculate a standby time in which the plasticizing ability is 0 (in a state where the screw 3 is stopped). Therefore, the analysis unit 102 calculates the standby time by subtracting the measurement time from the cycle time (obtained in step S102), with the total measurement time increment added until the total plasticized resin amount is reached as the measurement time. . This waiting time includes, for example, a time during which the screw 3 does not rotate, such as mold opening, mold closing, and injection holding pressure.

  After calculating the standby time, the analysis unit 102 inputs a time interval (hereinafter referred to as a standby time interval) indicating the length of one step for performing numerical analysis during the standby time (S302). Note that the standby time step input here may be a value different from the weighing time step input in step S105 or step S202.

  After inputting the standby time increment, the analysis unit 102 calculates each physical quantity (S303). The physical quantity calculated here is different from the above-described Step S106 and Step S203, and since the screw 3 is in a stopped state, the physical quantity other than the screw power and pressure is calculated. That is, the molten resin amount, the resin temperature, the solid phase rate, and the resin temperature are calculated over the entire calculation region. Each physical quantity is calculated by using the same mathematical formula as in step S106 and step S203 described above, the necessary parameters among the parameters acquired by the acquisition unit 101 in step S101, and the already calculated physical quantity (one hour before the step). It is calculated by introducing the calculated physical quantity or the physical quantity at the end of plasticization immediately after the end of plasticization. Here, the already calculated physical quantities are the resin temperature and the solid phase ratio. Since the screw 3 is in a stopped state, the resin does not move. Therefore, regarding the calculation of the physical quantity here, since the resin material is heated by the cylinder 2 even in the standby time, only the heat transfer is calculated. For example, using the physical quantities that have already been calculated, and calculating the parameters related to plasticizing capacity and resin movement speed to 0 using each formula, the changes in the resin temperature and solid phase ratio during the standby time are calculated. can do.

  After calculating each physical quantity, the determination unit 103 determines whether or not the current standby time has reached the cycle time (acquired in step S102) (S304), and if it has reached (S304, YES), the standby time ends. It is determined that each physical quantity at the end of the standby time is stored in the HDD 15 or the like, and this flow ends. It should be noted that a predetermined waiting time may be inserted after purging (immediately after the end of one cycle period) until the first plasticization start, and the change in physical quantity during that time may be calculated. On the other hand, if not reached (NO in S304), the analysis unit 102 adds the time for the standby time to the current standby time, returns the result of the addition as the current standby time to step S303, and calculates each physical quantity again. Done.

  Next, an example of the analysis result output by the plasticization analysis process according to the present embodiment will be described. FIG. 10 is a diagram showing the cylinder temperature and melt pool over the entire calculation region of the screw at a certain time, and FIG. 11 is a diagram showing the solid phase ratio and pressure over the entire calculation region of the screw at a certain time. FIG. 12 is a diagram showing temporal changes in resin temperature and plasticizing ability when the cycle period in a certain calculation region is short. FIG. 13 shows solid phase ratio and plasticizing ability when the cycle period in a certain calculation region is short. It is a figure which shows the time change of. FIG. 14 is a diagram showing temporal changes in the resin temperature and the plasticizing ability when the cycle period in a certain calculation region is long. FIG. 15 shows the solid phase ratio and the plasticizing ability when the cycle period in a certain calculation region is long. It is a figure which shows the time change of.

  10 to 15, 61 indicates a cylinder temperature, 62 indicates a melt pool temperature, 63 indicates a pressure, and 64 indicates a solid phase ratio. 65 indicates the resin temperature, and 66 indicates the plasticizing ability. As shown in each figure, according to the present embodiment, it is possible to easily grasp the relationship between the cylinder temperature and the melt pool and the relationship between the solid fraction and the pressure over the entire calculation region of the screw at a certain time. it can. Also, as shown in FIGS. 12 to 15, it is possible to easily grasp the time change of the resin temperature and the plasticizing ability and the time change of the solid phase ratio and the plasticizing ability in a certain calculation region.

  As shown in FIGS. 10 and 11, since the pellet-shaped resin material is supplied to the hopper 1 at the base portion of the screw 3, the cylinder temperature, the melt pool temperature, and the pressure are low, and the solid phase ratio is high. . On the other hand, the closer to the tip of the cylinder 3, the higher the cylinder temperature and the melt pool temperature, the lower the solid phase ratio, and the pressure increases from the root of the cylinder 3 to the tip. The position is lower. These indicate that the resin material is gradually melt plasticized, and appropriate analysis can be performed.

  Further, as shown in FIGS. 12 and 13, the resin temperature and the solid phase ratio increase and decrease with the increase and decrease of the plasticizing ability. This is reproduced even when the cycle period is extended as shown in FIGS. Thus, the time change of the resin temperature, the solid phase ratio, and the plasticizing ability in the calculation region when the intermittent operation is performed can be analyzed.

  According to the present embodiment, since the physical quantity can be calculated even in the standby time when the screw 3 is in the stopped state, the cycle operation in which the rotation and the standby are repeated can be reproduced. Specifically, the time until a predetermined amount of resin to accumulate is measured time, and the time obtained by subtracting the measured time from one cycle time is set as the standby time. Therefore, the cycle operation in which rotation and standby are repeated is reproduced. Can do. In addition, since physical quantities can be calculated for each time change, analysis results can be obtained for each time, and changes in output under certain input conditions can be easily observed in plasticization analysis involving screw rotation and standby. There is an effect.

  The present invention can be implemented in various other forms without departing from the gist or main features thereof. Therefore, the above-described embodiment is merely an example in all respects and should not be interpreted in a limited manner. The scope of the present invention is shown by the scope of claims, and is not restricted by the text of the specification. Moreover, all modifications, various improvements, substitutions and modifications belonging to the equivalent scope of the claims are all within the scope of the present invention.

  Further, the various steps in the plasticization simulation apparatus 10 described in the embodiment are stored in a computer-readable portable recording medium 8 as shown in FIG. 16 as a plasticization simulation program, and the recording is performed. By causing the information processing apparatus 9 to read the medium 8, the information processing apparatus 9 can realize the above-described functions. As the recording medium 8, for example, an optical disk (CD-ROM, DVD disk, etc.), a magnetic disk (hard disk drive, etc.), a flash memory, an IC card, and a medium that can be transmitted via a network are read and executed by a computer. All possible media are included.

  DESCRIPTION OF SYMBOLS 1 screw type injection molding machine, 3 screw, 10 plasticization simulation apparatus, 101 acquisition part, 102 analysis part, 103 determination part.

Claims (5)

Using the resin physical properties of the material used in the screw type plasticizing device, the operating conditions of the plasticizing device and the configuration data of the plasticizing device, using the screw characteristic formula, mass conservation formula and energy conservation formula solid fraction, temperature, pressure, a plasticizing simulation apparatus performs a physical quantity calculating process for calculating at least one physical quantity of the plasticizing capacity,
A first physical quantity calculation unit for calculating a physical quantity in a rotating state of the screw by the physical quantity calculation process;
A second physical quantity calculation unit that uses the physical quantity calculated by the first physical quantity calculation unit, and calculates a physical quantity in a stopped state of the screw using the screw characteristic formula, the mass conservation formula and the energy conservation formula ;
An extrusion amount calculation unit that calculates an extrusion amount indicating a resin amount that moves a predetermined distance inside the plasticizing apparatus, based on the physical amount calculated by the first physical amount calculation unit ;
The first physical quantity calculation unit repeats the calculation of the physical quantity at predetermined time intervals until the total amount of the calculated extrusion amount reaches a predetermined measurement resin amount,
The extrusion amount calculation unit repeats the calculation of the extrusion amount every time the physical amount is calculated for each time step by the first physical amount calculation unit,
The second physical quantity calculation unit uses the physical quantity calculated by the first physical quantity calculation unit when the total amount of the extrusion amount reaches the measured resin amount, and uses the screw characteristic formula, mass conservation formula, and energy conservation. using the formula, plasticizing simulator you calculating a physical quantity in a stopped state of the screw. When the total amount of the extrusion amount reaches the metered resin amount, the total value of the time increment until the total amount of the extrusion amount reaches the metered resin amount is subtracted from a predetermined cycle time, and the screw is stopped. A standby time calculation unit for calculating a standby time indicating a time to be maintained;
The second physical quantity calculation unit uses the physical quantity calculated by the first physical quantity calculation unit, and calculates a change in the physical quantity during the waiting time using the screw characteristic formula, the mass conservation formula, and the energy conservation formula. The plasticization simulation apparatus according to claim 1 . The second physical quantity calculation unit uses the physical quantity calculated by the first physical quantity calculation unit, and calculates heat transfer during the standby time using the screw characteristic formula, the mass conservation formula, and the energy conservation formula. The plasticization simulation apparatus according to claim 2, wherein the physical quantity is calculated by performing the calculation. Using the resin physical properties of the material used in the screw type plasticizing device, the operating conditions of the plasticizing device and the configuration data of the plasticizing device, using the screw characteristic formula, mass conservation formula and energy conservation formula solid fraction, temperature, pressure, a plasticizing simulation method plasticizing simulation device executes to perform a physical quantity calculating process for calculating at least one physical quantity of the plasticizing capacity,
A first physical quantity calculating step of calculating a physical quantity in a rotating state of the screw by the physical quantity calculating process;
A second physical quantity calculating step using the physical quantity calculated in the first physical quantity calculating step , and calculating a physical quantity in a stopped state of the screw using the screw characteristic formula, a mass conservation formula and an energy conservation formula ;
A simulation apparatus executes an extrusion amount calculation step of calculating an extrusion amount indicating a resin amount that moves a predetermined distance inside the plasticizing device based on the physical amount calculated in the first physical amount calculation step ,
In the first physical quantity calculating step, the calculation of the physical quantity is repeated at predetermined time intervals until the total amount of the calculated extrusion amount reaches a predetermined measurement resin amount,
In the extrusion amount calculation step, the calculation of the extrusion amount is repeated each time the physical amount is calculated for each time step by the first physical amount calculation step,
In the second physical quantity calculation step, when the total amount of the extrusion amount reaches the measured resin amount, the physical quantity calculated in the first physical quantity calculation step is used, and the screw characteristic formula, the mass conservation formula, and the energy conservation formula are used. The plasticization simulation method which calculates the physical quantity in the stop state of a screw using the formula . Using the resin physical properties of the material used in the screw type plasticizing device, the operating conditions of the plasticizing device and the configuration data of the plasticizing device, using the screw characteristic formula, mass conservation formula and energy conservation formula solid fraction, temperature, pressure, a plasticizing simulation program for executing a physical quantity calculating process for calculating at least one physical quantity of the plasticizing capacity in the computer,
Computer
A first physical quantity calculation unit for calculating a physical quantity in a rotating state of the screw by the physical quantity calculation process;
A second physical quantity calculation unit that uses the physical quantity calculated by the first physical quantity calculation unit, and calculates a physical quantity in a stopped state of the screw using the screw characteristic formula, the mass conservation formula and the energy conservation formula ;
Based on the physical quantity calculated by the first physical quantity calculation unit , function as an extrusion amount calculation unit that calculates an extrusion amount indicating a resin amount that moves a predetermined distance inside the plasticizing apparatus ,
The first physical quantity calculation unit repeats the calculation of the physical quantity at predetermined time intervals until the total amount of the calculated extrusion amount reaches a predetermined measurement resin amount,
The extrusion amount calculation unit repeats the calculation of the extrusion amount every time the physical amount is calculated for each time step by the first physical amount calculation unit,
The second physical quantity calculation unit uses the physical quantity calculated by the first physical quantity calculation unit when the total amount of the extrusion amount reaches the measured resin amount, and uses the screw characteristic formula, mass conservation formula, and energy conservation. The plasticization simulation program which calculates the physical quantity in the stop state of a screw using the formula of .

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