JP4387780B2 - Cold start prevention control method, cold start prevention control program, and injection molding machine equipped with the program - Google Patents

Description

The present invention, during the operation of the injection molding machine, predicts by simulation that the residual resin in the heating cylinder surely melts when the molding is stopped halfway and starts molding again, until the predicted time is reached, The present invention relates to a cold start prevention control method, a cold start prevention control program configured to prevent a screw from rotating, and an injection molding machine equipped with the program .

  Conventionally, in an injection molding machine, when molding is stopped during injection molding, if a long time elapses before restarting, the resin temperature decreases and solidifies. If the screw is rotated without being heated in the solidified state, the screw head and the screw main body may be broken. For this purpose, cold start prevention control has been performed for the purpose of preventing this.

  For example, Patent Document 1 discloses a technique in which a screw is operated only when the temperature of the slowest zone among a plurality of zones reaches a set value when the temperature of a heating cylinder is raised.

  Further, in Patent Document 2, in claim 1, “It is determined whether or not the machine has been restarted within a certain time after the molding is stopped. According to the stop time, calculation control for selecting a start condition that enables screw rotation is performed, and when the selected start condition is satisfied, an operation enable signal that enables screw rotation is output.

Further, in Patent Document 3, in claim 1, “the drive of the rotational drive device is released and the intermittent timer is started to time, the rotational drive device is started again after the set time of the intermittent timer and the monitoring timer is started to time. Then, an alarm is issued when the screw rotates and purge of the heating cylinder starts. "
JP-A-11-53956 JP-A-11-170327 JP 11-320639 A

  However, with such conventional techniques, it is difficult to know how the melting characteristics of the resin change depending on the actual type of resin and the configuration of the molding machine. Therefore, in practice, it depends on the judgment and operation of a molding engineer who has performed various conditions.

  For this reason, it is necessary for an inexperienced molding engineer to know the mechanical characteristics through a lot of injection molding experiences and, as a result, a lot of failure experience, which is a heavy burden on the engineer.

  Therefore, a technique for reducing the burden on the initial operation of the molding engineer is required, and it has been a problem to provide such a technique.

Accordingly, the object of the present invention is to consider the resin characteristics and mechanical characteristics in order to solve the problems in the cold start prevention control, and further reduce the work load without requiring empirical knowledge by engineers. The present invention also provides a cold start prevention control method, a cold start prevention control program, and an injection molding machine equipped with the program, which reduce machine breakage and wasteful energy consumption.

In order to achieve the above object, a cold start prevention control method according to the present invention includes a signal from an injection molding sequence input means connected to an injection molding machine having a plasticizing screw and a barrel and inputs an injection molding sequence and molding. A sequence control unit that outputs a control signal according to a molding processing program that controls processing, a motor control unit that controls a motor according to a control signal generated by the sequence control unit, and a barrel heater according to a control signal generated by the sequence control unit A temperature sensor for controlling and detecting temperature at a plurality of points on the barrel, storage means for storing detected temperature data, and calculation of temperature simulation based on at least information on the shape of the barrel and the plasticizing screw and resin And a display system for displaying the calculation result. A cold start-up control device comprising: a timer unit that is electrically connected to the process control unit to control the operation time of the barrel heater; and a storage unit that is connected to the process control unit. In the start prevention control method, the process control unit simulates temperature data at one or a plurality of locations of the screw and the barrel from the control condition data including the plasticized screw position data input from the input unit, and the process control unit Stores the temperature data in the storage means, the process control unit calculates a screw start timing from the temperature data and a predetermined screw start temperature condition table, and the process control unit sets the screw start timing to the timer. The timer unit counts the screw start timing. Serial sending the motor drive start signal to the motor control unit, activates the plasticizing screw after melting if the barrel inside the resin is left when restarting after pausing the operation of the injection molding machine To control.

Furthermore, the cold start prevention control method according to the present invention is a molding process for controlling a signal from an injection molding sequence input means connected to an injection molding machine having a plasticizing screw and a barrel and inputting an injection molding sequence, and the molding process. A sequence control unit that outputs a control signal according to a program, a motor control unit that controls a motor according to a control signal generated by the sequence control unit, a barrel heater that is controlled according to a control signal generated by the sequence control unit, and on the barrel Process control comprising a temperature sensor for detecting temperatures at a plurality of points, and display means for performing temperature simulation calculations based on at least the shape of the barrel and the plasticizing screw and information on the resin and displaying the calculation results And a barrel electrically connected to the process control unit In the cold start prevention control method of operating a cold start prevention control device comprising a timer unit for controlling the operation time of the data and a storage means connected to the process control unit for storing detected temperature data, The process control unit simulates temperature data at one or a plurality of locations of the screw and the barrel from the control condition data including the plasticizing screw position data input from the input means , and the process control unit stores the temperature data of the temperature. The process control unit displays the temperature information on the display unit, the timer unit receives a set time from the input unit, and the timer unit counts the screw start timing to the motor. It sends a motor drive start signal to the control unit, before the time of restarting after pausing the operation of the injection molding machine The control so as to start the plasticizing screw after melting if the barrel inside the resin is left.

Moreover, the cold start prevention control method according to the present invention is a molding that controls a signal from an injection molding sequence input means connected to an injection molding machine having a plasticizing screw and a barrel and inputs an injection molding sequence and molding processing. A sequence control unit that outputs a control signal according to a machining program, a motor control unit that controls a motor according to a control signal generated by the sequence control unit, and a barrel heater that is controlled according to the control signal generated by the sequence control unit and on the barrel A temperature sensor for detecting the temperature at a plurality of points, a storage means for storing the detected temperature data, and a temperature simulation calculation based on at least the shape of the barrel and the plasticizing screw and the resin, and the calculation result A process control unit including display means for displaying the process, and the process. A timer unit that is electrically connected to the control unit to control the operation time of the barrel heater, a connection interface unit that connects the process control unit and the connection medium, and an arithmetic terminal that is connected to the connection medium. In the cold start prevention control method for operating the cold start prevention control device, control condition data including plasticizing screw position data is input from the input means to the process control unit and stored in the storage unit, and the process control The control unit transmits the control condition data including the plasticized screw position data to the calculation terminal connected via the connection medium, and the calculation terminal receives the control condition data including the plasticized screw position data from the received screw. Simulate temperature data of temperature at one or more locations in each barrel, and the computing terminal is a connection medium The temperature data is stored in the storage means, the process control unit calculates a screw start timing from the temperature data and a predetermined screw start temperature condition table, and the process control unit determines the screw start timing The timer unit counts the screw start timing, transmits a motor drive start signal to the motor control unit, and pauses the operation of the injection molding machine to restart the barrel. When the resin remains, the plasticizing screw is controlled to start after melting.

Next, a cold start prevention control method according to the present invention is a molding that controls a signal from an injection molding sequence input means connected to an injection molding machine including a plasticizing screw and a barrel and inputs an injection molding sequence and molding processing. A sequence control unit that outputs a control signal according to a machining program, a motor control unit that controls a motor according to a control signal generated by the sequence control unit, and a barrel heater that is controlled according to the control signal generated by the sequence control unit and on the barrel A temperature sensor for detecting the temperature at a plurality of points, a storage means for storing the detected temperature data, and a temperature simulation calculation based on at least the shape of the barrel and the plasticizing screw and the resin, and the calculation result A process control unit including display means for displaying the process, and the process Cold starter comprising a timer unit that is electrically connected to the control unit to control the operation time of the barrel heater, a connection medium connected to the process control unit, and a computing terminal connected via the connection medium In the cold start prevention control method for operating the prevention control device, control condition data including plasticizing screw position data is input to the process control unit from the input means and stored in the first area of the storage unit, A process control unit transmits control condition data including the plasticized screw position data to a calculation terminal connected to the connection medium, and the calculation terminal transmits a screw from the received control condition data including the plasticized screw position data. And the first temperature data in one or a plurality of locations of the barrel, and the arithmetic terminal transmits the temperature via a connection medium. The first temperature data is stored in a second area of the storage unit, and the process control unit includes one or a plurality of screws and barrels based on control condition data including the plasticized screw position data input from an input unit. Second temperature data at a location is simulated, the process control unit stores the second temperature data in a third area of the storage unit, and the process control unit displays the first temperature data and the first temperature on the display unit. Two temperature data and
The process control unit calculates a screw start timing from the temporal change information selected from the first temperature data and the second temperature data and a predetermined screw start temperature condition table, and the process control unit Transmits the screw start timing to the timer unit, and the timer unit times the screw start timing and transmits a motor drive start signal to the motor control unit to temporarily stop the operation of the injection molding machine. When starting, if the resin inside the barrel remains, control is performed so that the plasticizing screw is started after melting.

  On the other hand, the control condition data including the plasticized screw position data includes screw density, thermal conductivity, specific heat, contact resistance, barrel density, thermal conductivity, specific heat, resin type, remaining amount, and density. And one or a combination of thermal conductivity, specific heat, and contact resistance.

  Further, the connection medium is a network card and a router connected to the network.

  Further, the connection medium is USB, RS-232C, SCSII, or IEEE1394.

A cold start prevention control program according to the present invention is a molding processing program for controlling a signal from an injection molding sequence input means connected to an injection molding machine having a plasticizing screw and a barrel and inputting an injection molding sequence, and molding processing. According to the control signal generated by the sequence control unit, a motor control unit for controlling the motor according to the control signal generated by the sequence control unit, and the barrel heater according to the control signal generated by the sequence control unit and a plurality of points on the barrel A process control unit comprising: a temperature sensor for detecting the temperature of the gas; and a display means for performing a temperature simulation calculation based on at least the shape of the barrel and the plasticizing screw and information on the resin, and displaying the calculation result The barrel control unit is electrically connected to the process control unit. Cold start prevention for an injection molding machine for operating a cold start prevention control device comprising a timer unit for controlling the operation time of the heater and a storage means connected to the process control unit for storing detected temperature data In the control program,
The process control unit simulates temperature change information over time at one or a plurality of locations of the screw and the barrel from the control condition data including the plasticized screw position data input from the input means, and the process control unit Is stored in the storage means, the process control unit calculates a screw start timing from the time change information and a predetermined screw start temperature condition table, and the process control unit determines the screw start timing The timer unit counts the screw start timing, transmits a motor drive start signal to the motor control unit, and pauses the operation of the injection molding machine to restart the barrel. Control to start the plasticizing screw after melting when a small amount of resin remains

The cold start prevention control device according to the present invention is connected to an injection molding machine including a plasticizing screw and a barrel, and a signal from an injection molding sequence input means for inputting an injection molding sequence and a molding processing program for controlling the molding processing, According to the control signal generated by the sequence control unit, a motor control unit for controlling the motor according to the control signal generated by the sequence control unit, and the barrel heater according to the control signal generated by the sequence control unit and a plurality of points on the barrel A temperature sensor for detecting the temperature of the toner, a storage means for storing the detected temperature data, and at least a temperature simulation calculation based on the shape and resin information of the barrel and the plasticizing screw and displaying the calculation result A process control unit comprising display means, and the process control unit A timer unit for controlling the electrical connection has been barrel heaters operating time of the and a storage means connected to the process control unit, the barrel internal when restarting after pausing the operation of the injection molding machine When the resin remains, control is performed so that the plasticizing screw is started after melting.

The cold start prevention control device according to the present invention is connected to an injection molding machine including a plasticizing screw and a barrel, and a signal from an injection molding sequence input means for inputting an injection molding sequence and a molding processing program for controlling the molding processing, According to the control signal generated by the sequence control unit, a motor control unit for controlling the motor according to the control signal generated by the sequence control unit, and the barrel heater according to the control signal generated by the sequence control unit and a plurality of points on the barrel A temperature sensor for detecting the temperature of the toner, a storage means for storing the detected temperature data, and at least a temperature simulation calculation based on the shape and resin information of the barrel and the plasticizing screw and displaying the calculation result A process control unit comprising display means;
A timer unit that is electrically connected to the process control unit to control the operation time of the barrel heater; a connection interface unit that connects the process control unit and a connection medium; and an arithmetic terminal connected to the connection medium. Then, when the resin inside the barrel remains when restarting after temporarily stopping the operation of the injection molding machine, the plasticizing screw is controlled to start after melting.

Furthermore, any injection molding machine equipped with the cold start prevention control program according to the present invention is suitable.

  The cold start prevention control method, the cold start prevention control apparatus and the injection molding machine according to the present invention can cope with the difference in each characteristic by performing a simulation using the resin characteristic and the mechanical characteristic. Since the environment is accurately reproduced as a numerical value, control can be performed without the need for an empirical rule, so the burden on the operator can be greatly reduced.

  Moreover, since the accuracy of the simulation can be improved, unnecessary energy consumption can be reduced by preventing the case where the melting is not completed sufficiently or when the temperature is excessively high.

  Hereinafter, embodiments based on embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 shows a block diagram of an embodiment of a control apparatus for an injection molding machine according to the present invention. The control device 2 and the injection molding machine 4 are electrically connected to each other.

  The control device 2 includes a servo CPU 6 as a motor control unit, a sequence CPU 8 as a sequence control unit, and a process CPU 10 as a heater control unit. The servo CPU 6, the sequence CPU 8 and the process CPU 10 are electrically connected to the common memory 12 via the bus wiring 14.

  The servo CPU 6 is connected to a ROM 16 and a RAM 18 that are storage devices, and a motor driver MD-C 20 that is also connected is electrically connected to a mold clamping motor 26 of an injection molding machine and an encoder 28 that measures the rotation angle thereof. .

  Similarly, a motor driver MD-I22 connected to the servo CPU 6 is electrically connected to the injection motor 30 of the injection molding machine and the encoder 32 that measures the rotation angle thereof.

  A motor driver MD-E24 connected to the servo CPU 6 is electrically connected to a product take-out motor 34 of the injection molding machine and an encoder 36 for measuring the rotation angle thereof.

  Further, a motor driver MD-K25 connected to the servo CPU 6 is electrically connected to a measuring motor 35 of the injection molding machine and an encoder 37 for measuring the rotation angle thereof.

The ROM 16 stores a control program as a control device, and the RAM 18 is used for temporary storage for control. The servo CPU 6 performs control while temporarily storing it in the RAM 18 according to the control program in the ROM 16.

  The sequence CPU 8 is connected to a ROM 38 and a RAM 40 which are storage devices, and an input / output interface 42 which is also connected is electrically connected to a start switch 44 for temperature control of the injection molding machine, a changeover switch 46 and a lamp 48. The

  The process CPU 10 is connected to an LCD 50 that is a display means, an input means 52 such as a keyboard and a mouse, a timer 54 that counts a time limit, a ROM 56 that is a storage means, a RAM 58, and an interface 60. A heater 62 for temperature control, a temperature sensor 64, and a pressure sensor 66 for pressure control are connected.

  Since the common memory 12 is connected to the servo CPU 6, the sequence CPU 8, and the process CPU 10 via the bus wiring 14, data can be shared among the three CPUs.

  The control of the injection molding machine in the above configuration will be described below. The control of the injection molding machine is mainly composed of three processes. The first process is an input of a molding program, the second process is a temperature control, and the third process is a molding operation process.

  The molding processing program is set by displaying an input form on the LCD 50 and input from an input means 52 such as a keyboard (not shown). The input content includes operation selection information such as whether molding is performed once, continuous molding, or step-by-step molding. The input molding process program is stored in the RAM 18 of the process CPU. The ROM 16 stores an input form and a molding program input reception and a control program for storing in the RAM 18.

  After completing the setting of the molding process program, the process CPU 10 starts temperature control by the cold start prevention control program after waiting for an input to the temperature control start switch 44 connected to the sequence CPU 8 via the input / output interface 42. .

  When the cold start prevention control program ends the temperature control simulation and the resin melting prediction time has elapsed, a molding operation start command is sent from the process CPU 10 to the servo CPU 6. At this time, the operation selection information stored in the RAM 18 is referred to.

Servo CPU 6 receives a molding operation start command, and motor drivers 20, 22, 24, and 25 detect position information by encoders 28, 32, 36, and 37, and perform clamping, injection molding, product removal , and measurement motors. 26, 30, 34, and 35 are driven and controlled in accordance with the molding program.

Next, FIGS. 2 and 3 show basic data collection for cold start prevention control simulation in the present invention. FIG. 2 is a diagram for collecting basic data for cold start prevention control simulation using an injection molding machine, and shows a barrel of an injection apparatus, which is fixed to a barrel main body 116 and a front end surface of the barrel main body 116. And the injection nozzle 102 mounted on the barrel head 114. A large number of band heaters 111, 112, 118, and 120 are attached to the outer peripheral surfaces of the barrel main body 116, the barrel head 114, and the injection nozzle 102, and the barrel is formed by the band heaters 111, 112, 118, 120. Heated. The temperature is measured by thermocouples 121 and 122 attached to the nozzle and barrel. A part of the barrel main body 116 is accommodated in the barrel cover 130. As shown in Fig. 2, an injection molding machine ISG650GT manufactured by Toshiba Machine Co., Ltd. is used as an example of data collection. Temperature sensors are placed in multiple locations in the barrel of the injection molding machine in advance, and the time elapsed from the start of heater heating The temperature rise with respect to was measured.

  FIG. 3 shows the temperature change when the resin in the barrel measured without various resins, resin A, resin B, resin C, resin D, and resin, (a) is a temperature measurement result by a sensor on the inner wall surface of the barrel. (B) shows the temperature measurement result by the sensor at a position 23 mm away from the barrel inner wall surface, and (c) shows the temperature measurement result by the sensor at a position 40 mm away from the barrel inner wall surface. The set temperature of the heater is 270 ° C., and the temperature at which the resin melts is 220 ° C. 3 (a), (b), and (c), the temperature rise rate is large when there is no resin in the barrel, and the temperature rise rate is slower toward the center of the barrel in comparison by position, and the temperature rise characteristics due to resin differences It shows that the variation is small.

Embodiment 1

  A cold start prevention control method according to the present invention will be described with reference to FIGS.

  In the cold start prevention control method, the molding program stored in the ROM 16 of the process CPU 10 causes the data input screen (FIG. 4) to be displayed on the LCD 50 and waits for the input of the initial value of the simulation function.

  The simulation function consists of (1) an approximate expression with an actual measurement value using only a linear function, (2) a combination of a quadratic function for the area immediately after the start of heater heating, a linear function for the time proportional area, and a logarithmic function for the saturation area. (3) A high-order function or S-curve three-system function is stored in the ROM in advance and is selected according to the CPU capability.

  The initial value input method is (1) a method of directly inputting the slope, intercept, derivative and constant, and (2) the plasticized screw position data, the plasticized screw physical property information, the barrel physical property information and the resin in advance. It means a method in which a correspondence table between physical property information and functions is created and stored, and an inclination, an intercept, a derivative, and a constant are calculated by inputting information. The function correspondence table is composed of a list of each physical property value and functions that can be approximated and constants of the function. By including the rate of change when the physical property value changes, it is possible to deal with a wide range of physical property values. Become.

  Simulation starts after initial value input and function selection. When the time-dependent temperature change information in the barrel is calculated by the simulation, it is stored in the common memory 12.

  When the process CPU 10 calculates the time-dependent temperature change information, it is melted by comparing it with a correspondence table (screw start temperature condition table) of the time-dependent temperature change information determined in advance by actual measurement and the predicted melting completion time (screw start timing). Completion prediction time is calculated. For example, a condition table for determining that the resin has melted when the simulation calculation temperature at the center of the barrel is 220 ° C. is a correspondence table for calculating the melting completion time. Here, as shown in FIG. 8, the case of A8 when the screw position is at the forward limit and the case of A12 that stops before the forward limit will be described.

  In the case of A8, the amount of resin remaining between the barrel and the screw tip is small. Therefore, whether or not the resin at the groove bottom of the screw has melted affects the damage to the screw. On the other hand, in the case of A12, there is a large gap between the screw and the barrel, and the resin there is still hard. The screw cannot be rotated.

  The process CPU 10 transmits the estimated melting completion time to the timer 54, and the timer 54 starts measuring time.

  The timer 54 transmits a motor drive start signal to the sequence CPU 8 and the servo CPU 6 at the estimated melting completion time.

  By adopting the above cold start prevention control method, the resin in the barrel can be surely melted in the minimum necessary time, so that it is possible to prevent damage to the screw, etc. It is possible to prevent wasted time and energy consumption when heating the heater for preventing start-up.

Embodiment 2

  A second embodiment of the cold start prevention control method according to the present invention will be described with reference to FIG.

  In the cold start prevention control method, the molding program stored in the ROM 16 of the process CPU 10 causes the data input screen (FIG. 4) to be displayed on the LCD 50 and waits for the input of the initial value of the simulation function.

  The simulation function consists of (1) an approximate expression with an actual measurement value using only a linear function, (2) a combination of a quadratic function for the area immediately after the start of heater heating, a linear function for the time proportional area, and a logarithmic function for the saturation area. (3) A high-order function or S-curve three-system function is stored in the ROM in advance and is selected according to the CPU capability.

  The initial value input method is (1) a method of directly inputting the slope, intercept, derivative and constant, and (2) the plasticized screw position data, the plasticized screw physical property information, the barrel physical property information and the resin in advance. A correspondence table between the physical property information and the function may be created and stored in advance, and the slope, intercept, derivative, and constant may be calculated and input by inputting the information. The function correspondence table, that is, the screw start temperature condition table, is composed of a list of each physical property value and functions that can be approximated, and constants of the function, and changes in the physical property value by including the rate of change when the physical property value changes. A wide range can be supported.

  Simulation starts after initial value input and function selection. When the time-dependent temperature change information in the barrel is calculated by the simulation, it is stored in the common memory 12.

  The process CPU 10 causes the LCD 50 to display the calculated temperature change information with time.

  The process CPU 10 waits for the set time to be input to the timer 54 from a keyboard or the like, and after the input, the timer 54 starts measuring time.

  The timer 54 transmits a motor drive start signal to the sequence CPU 8 and the servo CPU 6 at the estimated melting completion time.

  By adopting the above cold start prevention control method, the resin in the barrel can be surely melted in the minimum necessary time, so that it is possible to prevent damage to the screw, etc. It is possible to prevent wasted time and energy consumption when heating the heater for preventing start-up.

Embodiment 3

  A third embodiment of the cold start prevention control method according to the present invention will be described with reference to FIGS.

  The configuration of the third embodiment of the cold start prevention control method according to the present invention is shown in FIG. 6, and the same components as those in FIG. In addition, the difference from FIG.

  The difference from FIG. 1 is that a network connection device 68 is added to the process CPU 10, and the network connection device 68 is connected to a computer 74 via a network 70 and another network connection device 72. is there.

  Specifically, the network connection devices 68 and 72 are network cards for connecting to a LAN. The network 70 is an intranet using the TCP / IP or the Internet.

  The computer 74 is preferably an engineering workstation which is a CPU 76 having a higher performance than the process CPU 10.

  The CPU 76 includes a ROM 82, a RAM 84, an LCD 78 as a display device, and input means such as a keyboard.

  A case where the simulation is performed by the CPU 76 with the above configuration will be described.

  In the cold start prevention control method, the molding program stored in the ROM 16 of the process CPU 10 causes the data input screen (FIG. 4) to be displayed on the LCD 50 and waits for the input of the initial value of the simulation function.

  Data input from the data input screen (FIG. 4) is the plasticized screw position data, the plasticized screw physical property information, the barrel physical property information, and the resin physical property information. Here, the plasticized screw physical property information is one or a combination of screw density, thermal conductivity, specific heat, and contact resistance, and the barrel physical property information is one or a combination of density, thermal conductivity, and specific heat. The resin physical property information includes one or a combination of resin type, remaining amount, density, thermal conductivity, specific heat, and contact resistance.

  When the data is input from an input device 52 such as a keyboard, the process CPU 10 stores the data in the common memory 12 and transmits it to the CPU 76 via the network 70.

  The ROM 82 connected to the CPU 76 stores simulation analysis software.

  FIG. 5 shows the preconditions and input parameters of the simulation by the simulation analysis software. The points to be simulated are the points including a, b, and c toward the center in order from the barrel inner wall shown in FIG.

  The symmetrical injection molding machine shows the temperature change of the resin when the barrel is heated during the cold start prevention control from the state where the screw is retracted 200 mm from the forward limit and the resin is left in the barrel.

  The analysis model was an axially symmetric model because of its cylindrical shape, and the length of the screw itself excluding the screw tip was three times the screw diameter.

  Physical property values and boundary conditions for simulation are shown. The contact thermal resistance between the screw resin and the resin barrel, and the thermal conductivity of the resin are calculated by comparing the barrel screw measured temperature with the unsteady thermal conductivity analysis result. Table 1 shows the physical property values necessary for the simulation and the time variation of the barrel temperature, and FIG. 5 (2) shows a graph of time versus temperature.

  In this case, the cold start prevention control may be canceled after 4500 seconds when the observed temperature of most resins exceeds 150 ° C. The CPU 76 transmits the melting completion prediction time calculated here to the timer 54 via the network 70, and the timer 54 starts measuring time. The subsequent steps are the same as in the first embodiment.

By adopting the above cold start prevention control method, the resin in the barrel can be surely melted in the minimum necessary time, so that it is possible to prevent damage to the screw, etc. It is possible to prevent wasted time and energy consumption when heating the heater for preventing start-up. In particular, in the third embodiment, since the predicted melting completion time is predicted using a high performance computer such as a higher performance engineering workstation, it is possible to calculate the predicted melting completion time with higher accuracy.

  Although the simulation is performed only by the CPU 76 in the third embodiment, the accuracy of the process CPU 10 can be improved by performing the simulation and comparing and correcting the process CPU 10 at the same time. In this case, one of the predicted temperature data is stored in the first data area of the common memory, the other one of the predicted temperature data is stored in the second data area of the common memory, and the two data are compared and actually measured. The data selected against the temperature is used to determine the expected melt completion time and start the plasticizing screw after timing by a timer.

Embodiment 4

  The configuration of the fourth embodiment of the cold start prevention control method according to the present invention is shown in FIG. 7, and the same components as those in FIG. Further, the difference from FIG. 6 will be noted.

The difference between the fourth embodiment and the third embodiment is that the process CPU 6 and the CPU 76 are connected by a cable instead of a network.

As the cable, the RS-232C, the USB cable, the IEEE1394 cable, the SCSI cable, and the interface corresponding thereto are provided in the process CPU 6 and the CPU 76 , thereby enabling connection.

The distance between the process CPU 6 and the CPU 76 is short, and the data transfer speed can be increased.

As described above, the present invention provides a cold start prevention control method, a cold start prevention control program, and an injection molding machine equipped with the same program, which can perform the cold start prevention control of the injection molding machine more accurately and reliably. provide.

It is a block diagram of a 1st embodiment which realizes the cold starting prevention control method concerning the present invention. It is the side view (a) and enlarged view (b) of an injection molding machine which measure the actual value of the cold starting prevention control method concerning the present invention. The measured resin when the resin in the barrel is resin A, resin B, resin C, resin D, no resin, (a) shows a graph of temperature measurement results by a sensor on the inner wall of the barrel, (b) Shows a temperature measurement result graph by a sensor at a position 23 mm away from the barrel inner wall surface, and (c) shows a temperature measurement result graph by a sensor at a position 40 mm away from the barrel inner wall surface. It is an input screen of various data of a 1st embodiment which realizes the cold starting prevention control method concerning the present invention. The barrel sectional view (1) showing the position of the point simulated by the cold start prevention control method according to the present invention and the graph (2) of the simulation result of each point are shown. It is a block diagram of 3rd Embodiment which implement | achieves the cold start prevention control method which concerns on this invention, Comprising: What was connected with the other computer via the network is shown. It is a block diagram of 4th Embodiment which implement | achieves the cold starting prevention control method concerning this invention, Comprising: What was connected with the other computer with the cable is shown. The flowchart of 1st Embodiment which implement | achieves the cold starting prevention control method which concerns on this invention is shown.

Explanation of symbols

2 Controller 4 Injection molding machine 6 Servo CPU
8 Sequence CPU
10 Process CPU
14 Bus wiring 12 Common memory 16 ROM
18 RAM
20 Motor driver MD-C
22 Motor driver MD-I
24 Motor driver MD-E
25 Motor driver MD-K
26 Mold Clamping Motor 28 Encoder 30 Injection Motor 32 Encoder 34 Product Extraction Motor 35 Measuring Motor 36 Encoder 37 Encoder 38 ROM
40 RAM
42 I / O interface 44 Start switch 46 Changeover switch 48 Lamp 50 LCD
52 Input means 54 Timer 56 ROM
58 RAM
60 Interface 62 Heater 64 Temperature sensor 66 Pressure sensor 52 Input means 68 Network connection device 70 Network 72 Network connection device 74 Computer 76 CPU
82 ROM
84 RAM
78 LCD
80 input means
101 nozzle
111, 112, 118, 120 heater
114 barrel head
116 barrels
121, 122 thermocouple
130 barrel cover

Claims (9)

A sequence control unit that outputs a control signal in accordance with a signal from an injection molding sequence input unit that is connected to an injection molding machine including a plasticizing screw and a barrel and inputs an injection molding sequence, and a molding processing program that controls the molding process;
A motor control unit for controlling the motor in accordance with a control signal generated by the sequence control unit;
A temperature sensor that controls the barrel heater according to the control signal generated by the sequence control unit and detects the temperature of a plurality of points on the barrel, and at least a temperature simulation based on the shape and resin information of the barrel and the plasticizing screw. A process control unit including a display means for performing calculation and displaying the calculation result;
A timer unit that is electrically connected to the process control unit to control the operation time of the barrel heater;
In the cold start prevention control method for operating the cold start prevention control device including the storage means connected to the process control unit and storing the detected temperature data,
The process control unit calculates and calculates temperature data at one or a plurality of locations of the screw and the barrel from the control condition data including the plasticized screw position data input from the input means,
The process control unit stores the temperature data in the storage means,
The process control unit calculates a screw start timing from the temperature data and a predetermined screw start temperature condition table,
The process control unit transmits the screw start timing to the timer unit,
The timer unit times the screw start timing and transmits a motor drive start signal to the motor control unit,
Cold start prevention for an injection molding machine that controls to start the plasticizing screw after melting if the resin inside the barrel remains when restarting after temporarily stopping the operation of the injection molding machine Control method. A sequence control unit that outputs a control signal in accordance with a signal from an injection molding sequence input unit that is connected to an injection molding machine including a plasticizing screw and a barrel and inputs an injection molding sequence, and a molding processing program that controls the molding process;
A motor control unit for controlling the motor in accordance with a control signal generated by the sequence control unit;
A temperature sensor that controls the barrel heater according to the control signal generated by the sequence control unit and detects the temperature of a plurality of points on the barrel, and at least a temperature simulation based on the shape and resin information of the barrel and the plasticizing screw. A process control unit including a display means for performing calculation and displaying the calculation result;
A timer unit that is electrically connected to the process control unit to control the operation time of the barrel heater;
In the cold start prevention control method for operating the cold start prevention control device including the storage means connected to the process control unit and storing the detected temperature data,
The process control unit calculates and calculates temperature data at one or a plurality of locations of the screw and the barrel from the control condition data including the plasticized screw position data input from the input means,
The process control unit stores the temperature data in the storage means,
The process control unit displays the temperature data on the display means,
A set time is input from the input means to the timer unit,
The timer unit times the screw start timing and transmits a motor drive start signal to the motor control unit,
Cold start prevention for an injection molding machine that controls to start the plasticizing screw after melting if the resin inside the barrel remains when restarting after temporarily stopping the operation of the injection molding machine Control method. A sequence control unit that outputs a control signal in accordance with a signal from an injection molding sequence input unit that is connected to an injection molding machine including a plasticizing screw and a barrel and inputs an injection molding sequence, and a molding processing program that controls the molding process;
A motor control unit for controlling the motor in accordance with a control signal generated by the sequence control unit;
A temperature sensor for controlling the barrel heater in accordance with a control signal generated by the sequence control unit and detecting temperatures at a plurality of points on the barrel; storage means for storing detected temperature data; and at least the shape and resin of the barrel and the plasticizing screw A process control unit comprising a display means for performing a temperature simulation calculation based on the information and displaying the calculation result;
A timer unit that is electrically connected to the process control unit to control the operation time of the barrel heater;
A connection interface unit for connecting the process control unit and a connection medium;
A computing terminal connected to the connection medium;
In a cold start prevention control method for operating a cold start prevention control device comprising:
Control condition data including the plasticizing screw position data to the process control unit is input from the input means and stored in the storage means,
The process control unit is transmitted control condition data including plasticized screw position data to a computing terminal connected via the connection medium,
The calculation terminal calculates and calculates temperature data at one or a plurality of locations of the screw and barrel from the received control condition data including the plasticized screw position data,
The computing terminal stores the temperature data in the storage means via a connection medium,
The process control unit calculates a screw start timing from the temperature data and a predetermined screw start temperature condition table,
The process control unit transmits the screw start timing to the timer unit,
The timer unit times the screw start timing and transmits a motor drive start signal to the motor control unit,
Cold start prevention for an injection molding machine that controls to start the plasticizing screw after melting if the resin inside the barrel remains when restarting after temporarily stopping the operation of the injection molding machine Control method. A sequence control unit that outputs a control signal in accordance with a signal from an injection molding sequence input unit that is connected to an injection molding machine including a plasticizing screw and a barrel and inputs an injection molding sequence, and a molding processing program that controls the molding process;
A motor control unit for controlling the motor in accordance with a control signal generated by the sequence control unit;
A temperature sensor for controlling the barrel heater in accordance with a control signal generated by the sequence control unit and detecting temperatures at a plurality of points on the barrel; storage means for storing detected temperature data; and at least the shape and resin of the barrel and the plasticizing screw A process control unit comprising a display means for performing a temperature simulation calculation based on the information and displaying the calculation result;
A timer unit that is electrically connected to the process control unit to control the operation time of the barrel heater;
A connection medium connected to the process control unit;
A computing terminal connected via the connection medium;
In a cold start prevention control method for operating a cold start prevention control device comprising:
Control condition data including plasticizing screw position data to the process control unit is input from the input means and stored in the first area of the storage unit,
The process control unit is transmitted to the computing terminal connected to the connection medium and control condition data including the plasticized screw position data,
The computing terminal calculates and calculates the first temperature data at one or a plurality of locations of the screw and barrel from the received control condition data including the plasticized screw position data,
The computing terminal stores the first temperature data in a second area of the storage unit via a connection medium,
The process control unit simulates second temperature data at one or a plurality of locations of the screw and the barrel from the control condition data including the plasticized screw position data input from the input means,
The process control unit stores the second temperature data in a third area of the storage unit,
The process control unit displays the first temperature data and the second temperature data on the display unit,
The process control unit calculates a screw start timing from the temperature data selected from the first temperature data and the second temperature data and a predetermined screw start temperature condition table,
The process control unit transmits the screw start timing to the timer unit,
The timer unit times the screw start timing and transmits a motor drive start signal to the motor control unit,
Cold start prevention for an injection molding machine that controls to start the plasticizing screw after melting if the resin inside the barrel remains when restarting after temporarily stopping the operation of the injection molding machine Control method.   The control condition data including the plasticized screw position data includes screw density, thermal conductivity, specific heat, contact resistance, barrel density, thermal conductivity, specific heat, resin type, remaining amount, density, and heat. 5. The cold start prevention control method for an injection molding machine according to claim 1, comprising one or a combination of conductivity, specific heat and contact resistance.   5. The cold start prevention control method for an injection molding machine according to claim 3, wherein the connection medium is a network and a network card and a router connected to the network.   5. The cold start prevention control method for an injection molding machine according to claim 3, wherein the connection medium is USB, RS-232C, SCSII, or IEEE1394. A sequence control unit that outputs a control signal in accordance with a signal from an injection molding sequence input unit that is connected to an injection molding machine including a plasticizing screw and a barrel and inputs an injection molding sequence, and a molding processing program that controls the molding process;
A motor control unit for controlling the motor in accordance with a control signal generated by the sequence control unit;
A temperature sensor for controlling the barrel heater in accordance with a control signal generated by the sequence control unit and detecting temperatures at a plurality of points on the barrel; storage means for storing detected temperature data; and at least the shape and resin of the barrel and the plasticizing screw A process control unit comprising a display means for performing a temperature simulation calculation based on the information and displaying the calculation result;
A timer unit that is electrically connected to the process control unit to control the operation time of the barrel heater;
In the cold start prevention control program for the injection molding machine for operating the cold start prevention control device provided with the storage means connected to the process control unit,
The process control unit simulates temperature data at one or a plurality of locations of the screw and the barrel from the control condition data including the plasticized screw position data input from the input means,
The process control unit stores the temperature data in the storage means,
The process control unit calculates a screw start timing from the temperature data and a predetermined screw start temperature condition table,
The process control unit transmits the screw start timing to the timer unit,
The timer unit times the screw start timing and transmits a motor drive start signal to the motor control unit,
Cold start prevention for an injection molding machine that controls to start the plasticizing screw after melting if the resin inside the barrel remains when restarting after temporarily stopping the operation of the injection molding machine Control program. A sequence control unit that outputs a control signal in accordance with a signal from an injection molding sequence input unit that is connected to an injection molding machine including a plasticizing screw and a barrel and inputs an injection molding sequence, and a molding processing program that controls the molding process;
A motor control unit for controlling the motor in accordance with a control signal generated by the sequence control unit;
A temperature sensor for controlling the barrel heater in accordance with a control signal generated by the sequence control unit and detecting temperatures at a plurality of points on the barrel; storage means for storing detected temperature data; and at least the shape and resin of the barrel and the plasticizing screw A process control unit comprising a display means for performing a temperature simulation calculation based on the information and displaying the calculation result;
A timer unit that is electrically connected to the process control unit to control the operation time of the barrel heater;
In an injection molding machine comprising storage means connected to the process control unit,
The process control unit simulates temperature data at one or a plurality of locations of the screw and the barrel from the control condition data including the plasticized screw position data input from the input means,
The process control unit stores the temperature data in the storage means,
The process control unit calculates a screw start timing from the temperature data and a predetermined screw start temperature condition table,
The process control unit transmits the screw start timing to the timer unit,
The timer unit measures the screw start timing and transmits a motor drive start signal to the motor control unit, and when the operation of the injection molding machine is temporarily stopped and then restarted, the resin inside the barrel remains. An injection molding machine in which a cold start prevention control program for controlling the plasticizing screw to start after melting is installed in the process control unit.

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