JPH0929807A - Method and apparatus for automatically heating up heating cylinder of molding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to start the operation in the state that the temperature of a heating cylinder is effectively maintained at a set temperature value at the time of starting the molding operation by starting the heating up of the cylinder before the time of starting the predetermined molding operation by the time required for heating up the cylinder to the temperatute necessary for molding. SOLUTION: In the injection molding machine which stops the operation in the state that the heater power source of a controller 3 is OFF, an arithmetic processor 5 inputs the actually measured temperature value of a heating cylinder 1 via a temperature regulator 4 by the processor 5 when it becomes 120 minutes before (first actual temperature measurement) the time of completing the heating up stored in the RAM memory of a setter 6. Then, the temperature difference between the actual temperature measured value and the set temperature value stored in the setter 6 is calculated. The heating up starting time is calculated based on the difference. At the time of starting the heating up, a heat-up start command is sent to the regulator 4. Thus, the heating up of the cylinder 1 is started.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for automatically heating a heating cylinder of an injection molding machine, an extrusion molding machine or the like.

[0002]

2. Description of the Related Art For example, a heating cylinder of an injection molding machine is provided with a band heater, and resin supplied from a hopper is heated and melted in the heating cylinder by the band heater and injected from a nozzle. At this time, the heating cylinder is required to always maintain a constant temperature. As an example thereof, a conventional heating method for a heating cylinder will be described with reference to FIG. FIG. 5 is a block diagram of a conventional heat-up control device for a heating cylinder.

As shown in FIG. 5, the heating cylinder 1 is provided with a band heater 2 and a temperature sensor 8, and the band heater 2 and the temperature sensor 8 are provided in a controller 3 '. Each is connected to the temperature control device 4. A setting device 6 ′ including a data input means (not shown), a display device, and a RAM memory (not shown) is connected to the temperature control device 4 via an arithmetic processing device 5. The above constitutes a heat-up control device for the heating cylinder.

Next, the operation will be described. The data of the cylinder temperature set value and the heat-up start time are input in advance by the data input means of the setting device 6 ′, and these data are stored in the RAM memory of the setting device 6 ′. Then, by giving a heat-up start command to the temperature control device 4 from the arithmetic processing device 5, the temperature control device 4 energizes the band heater 2 to start the heat-up of the heating cylinder 1, and the heating by the temperature sensor 8 is performed. The temperature of the heating cylinder 1 is controlled by performing a comparison calculation based on the actual temperature measurement value of the cylinder 1 with the cylinder temperature setting value input to the setting device 6 by the calculation processing device 5.

When the heat-up of the heating cylinder 1 is started at the designated time, when the heat-up start time input to the setting device 6 is reached, the arithmetic processing device 5 instructs the temperature control device 4 to operate. To send a heat-up start command, and thereafter, in the same manner as the above operation, the heating cylinder 1
Is heated up and the temperature is controlled.

[0006]

In the heat-up system of the heating cylinder of the injection molding machine according to the above-mentioned conventional technique, the band heater 2 is turned on at the heat-up start time input in advance.
The heating of the heating cylinder 1 is started by being N (energized), and several hours (several minutes) after that, the temperature of the heating cylinder 1 reaches the set temperature value, and the molding operation can be started.

However, the temperature of the heating cylinder 1 drops by natural heat release several hours after the molding work operation is stopped and the heater power supply is turned off. The temperature drops. Therefore, even if the heater power of the injection molding machine is turned on again to start the molding work operation after that, it takes a long time for the heating cylinder 1 to heat up and reach the temperature (set temperature value) required for molding. Requires. In addition, since there is a difference in temperature drop depending on the length of the stop time and the model / model of the injection molding machine, the region and the season, it takes a lot of preparation time and labor to set and heat up the heat-up time. The work efficiency is reduced and the cost is increased.

Therefore, in view of the above-mentioned prior art, the present invention provides a method and an apparatus for automatically heating a heating cylinder of a molding machine capable of heating the heating cylinder to a temperature required for molding by a predetermined molding operation start time. The challenge is to provide.

[0009]

Means for Solving the Problems A first method for solving the above problems is described below.
The method is an automatic heat-up method for a heating cylinder of a molding machine that heats up the heating cylinder by controlling energization to a heater provided in the heating cylinder based on an actual temperature measurement value of the heating cylinder of the molding machine. Therefore, the molding work operation start time, the set temperature value of the heating cylinder required at the start of the molding work operation, the actual temperature measurement time of the heating cylinder, and the temperature difference between the set temperature value and the actual temperature measurement value of the heating cylinder. Based on the data of the time required to heat up the heating cylinder corresponding to this and the set temperature value, the actual temperature of the heating cylinder is measured before the actual temperature measurement time of the molding work operation start time, The time required to calculate the temperature difference between the actual temperature measurement value and the set temperature value and heat up the heating cylinder to the set temperature value based on this temperature difference. The heating of the heating cylinder is started before the molding work operation start time by the calculated time, and the heating of the heating cylinder is automatically completed by the molding work operation start time. It is characterized by

In the second method, the heat capacity and the heater capacity of the heating cylinder, which differ according to the model and model of the molding machine in the first method, and the temperature drop rate of the heating cylinder, which varies depending on the region and season, are used. The heat-up of the heating cylinder is automatically completed based on a plurality of data that can be dealt with.

A first device for solving the above-mentioned problems has a temperature measuring means for measuring an actual temperature of a heating cylinder of a molding machine,
An automatic heat-up device for a heating cylinder of a molding machine, which heats up the heating cylinder by controlling energization to a heater provided in the heating cylinder based on an actual temperature measurement value of the temperature measuring means. Operation start time, set temperature value of the heating cylinder required at the start of molding work operation,
Actual temperature measurement time of the heating cylinder, temperature difference between the set temperature value and the actual temperature measurement value of the heating cylinder, and data of time required to heat up the corresponding heating cylinder to the set temperature value Based on the data set by this setting means and the setting means for previously inputting, the actual temperature measurement value of the heating cylinder is input from the temperature measuring means before the actual temperature measurement time of the molding work operation start time. In addition, the temperature difference between the actual temperature measurement value and the set temperature value is calculated, and the time required to heat up the heating cylinder to the set temperature value is calculated based on this temperature difference, and this calculation is performed. And an arithmetic processing means for outputting a heat-up start command for the heating cylinder before the molding operation operation start time by the above-mentioned time, and storing the arithmetic program. And means, based on the heat-up start command, and having a temperature control means for initiating the energization of the heater.

The second device is the same as the first device, except that the heat capacity and the heater capacity of the heating cylinder differ depending on the model and model of the molding machine, and the temperature drop rate of the heating cylinder that varies depending on the region and season. It is characterized in that a plurality of data that can be dealt with are set, and arithmetic processing is performed based on the plurality of data.

Therefore, according to the above first method and apparatus,
The time required to heat up the heating cylinder to the set temperature value is calculated based on the temperature difference between the actual measured temperature of the heating cylinder and the set temperature value of the heating cylinder required at the start of molding operation, and only this time is calculated. By turning on the heater power source to heat up the heating cylinder before the molding operation operation start time, the temperature of the heating cylinder rises to the set temperature value by the time the molding operation operation starts and is stabilized.

Further, according to the second method and apparatus, the heat capacity of the heating cylinder and the capacity of the heater, which differ depending on the model and model of the molding machine, and the temperature drop rate of the heating cylinder, which fluctuates depending on the region and season, are dealt with. Even if the heat capacity of the heating cylinder is different or the temperature drop rate of the heating cylinder fluctuates as described above, the temperature of the heating cylinder can be reliably maintained until the molding operation start time by using multiple possible data. Then, the temperature rises to the set temperature value and stabilizes.

[0015]

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

FIG. 1 is a block diagram of a heat-up control device for a heating cylinder of a molding machine according to an embodiment of the present invention, and FIG. 2 is FIG.
3 is an explanatory view showing a relative table of input data input to the setting device shown in FIG. 3, FIG. 3 is a flow chart showing the operation of the control device shown in FIG. 1, and FIG. 4 is a heat-up transition of the heating cylinder by the control device shown in FIG. It is a graph shown.

As shown in FIG. 1, the heating cylinder 1 is provided with a band heater 2 and a temperature sensor 8, and the band heater 2 and the temperature sensor 8 are provided in a controller 3 for temperature control. Each is connected to the device 4.

In the control unit 3, the arithmetic processing unit 5,
A setting device 6 including a data input means (not shown), a display and a RAM memory, and a ROM memory 7 for storing a heat-up automatic calculation program are provided. The calculation processing device 5 includes a temperature control device 4 and a setting device. It is connected to the device 6 and the ROM memory 7. The above constitutes a heat-up control device for the heating cylinder.

Next, the operation and the like will be described. As data for automatically heating up the heating cylinder 1, FIG.
Heat-up completion time shown at (molding work operation start time)
And the set temperature value "S" required for starting the molding operation (temperature of the heating cylinder 1 required for molding) and the actual temperature of the heating cylinder 1 shown in FIG. 2 (4 in the illustrated example).
Times and time (120 minutes, 90 minutes, 60 minutes, 3 in the illustrated example)
0 minutes) and the data of ΔT and Δt are input by the input means of the setting device 6, and these data are stored in the RAM of the setting device 6.
Store in memory. It should be noted that ΔT is the temperature difference between the set temperature value and the actual temperature measurement value of the heating cylinder 1, and Δt is the heat-up start setting time (how many minutes before the heat-up completion time), that is, heating for each ΔT. This is the time required to heat up the cylinder 1 to the set temperature value.
A program for heat-up automatic calculation of the heating cylinder 1 is input and stored in the ROM memory 7 by another input means.

The above input data is for the molding machine model
A plurality of heating cylinders are provided so as to cope with the heat capacity of the heating cylinder and the capacity of the heater, which differ depending on the model, and the temperature drop rate of the heating cylinder, which varies depending on the region and season.

Then, the heater power of the control device 3 is turned off.
In the injection molding machine that is stopped in the
The arithmetic processing unit 5 performs arithmetic processing as shown in FIG. 3 based on the above data set in the setting unit 6. That is, at 120 minutes before the heat-up completion time stored in the RAM memory of the setting device 6 (first actual temperature measurement), the arithmetic processing device 5 causes the temperature of the heating cylinder 1 of the heating cylinder 1 via the temperature adjusting device 4. The actual temperature measurement value is input, the temperature difference ΔT between this actual temperature measurement value and the set temperature value “S” stored in the setting device 6 is calculated, and Δt is calculated based on this temperature difference ΔT, At that time (that is, before the heat-up completion time by Δt), a heat-up start command is transmitted to the temperature controller 4. As a result, the power of the band heater 2 is turned on (the band heater 2 is energized from the temperature controller 4), and the heating of the heating cylinder 1 is started.

When the temperature difference ΔT is 130 ° C. or less, the actual temperature of the heating cylinder 1 (the second actual temperature measurement) is measured again after 30 minutes (90 minutes before the heat-up completion time). Then, the temperature difference ΔT is calculated in the same manner as above. When the temperature difference ΔT is 70 ° C. or less, the actual temperature of the heating cylinder 1 (third actual temperature measurement) is measured again after 30 minutes (60 minutes before the heat-up completion time), and the temperature is the same as above. Calculate the difference ΔT. When this temperature difference ΔT is 30 ° C or less, after 30 minutes (30 minutes before the heat-up completion time)
Then, the actual temperature of the heating cylinder 1 is measured again (the fourth actual temperature measurement), and the temperature difference ΔT is calculated in the same manner as above. Also during the second, third, and fourth actual temperature measurements, Δt is calculated based on the calculated temperature difference ΔT, and the heat-up start command is transmitted to the temperature controller 4 at that time. That is, the heat-up start command is transmitted based on Δt calculated at the actual temperature measurement of the first time, the second time, the third time, or the fourth time, whereby the power supply of the band heater 2 is turned on.
Then, heating up of the heating cylinder 1 is started. As a result, the temperature of the heating cylinder 1 reaches the set temperature value "S" at the molding operation operation start time and becomes stable, and the molding operation can be started at this molding operation operation start time.

That is, as shown in the graph of FIG. 4, the heating cylinder 1 calculates in the calculating device 4 on the basis of the actual temperature of the heating cylinder 1 measured at each set time and the set temperature value "S". By turning on the power source of the band heater 2 according to the value of Δt, the heat is automatically heated so that the set temperature value “S” is certainly reached by the molding operation operation start time and becomes stable.

Further, since a plurality of input data are provided as described above, when the heat capacity of the heating cylinder 1 and the capacity of the hand heater 2 differ depending on the model and model of the molding machine, or the heating cylinder 1 of the heating cylinder 1 varies depending on the region and season. Even when the temperature drop rate fluctuates, the temperature of the heating cylinder 1 can be reliably raised to the set temperature value “S” and stabilized by the molding operation operation start time.

[0025]

As described above in detail with the embodiments of the present invention, according to the present invention, a predetermined amount of time is required to heat up the heating cylinder to the temperature (set temperature value) required for molding. By starting the heat-up of the heating cylinder before the molding operation start time of
Since the heating cylinder temperature can be automatically raised to the set temperature value and stabilized by the molding operation operation start time, the heating cylinder temperature must be maintained at the set temperature value at the molding operation operation start time. You can start working with. Therefore, labor and time are reduced, and work efficiency and
Productivity is improved.

Further, the heat capacity of the heating cylinder and the capacity of the heater, which differ depending on the model and model of the molding machine, and a plurality of data which can correspond to the temperature drop rate of the heating cylinder, which fluctuates depending on the region and season, are used. In this way, even if the heat capacity of the heating cylinder is different or the temperature drop rate of the heating cylinder fluctuates, the temperature of the heating cylinder is surely raised to the set temperature value by the molding operation start time and stabilized. Can be made.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a heat-up control device for a heating cylinder according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a relative table of input data input to the setting device shown in FIG.

FIG. 3 is a flowchart showing an operation of the control device shown in FIG.

FIG. 4 is a graph showing a heat-up transition of a heating cylinder by the control device shown in FIG.

FIG. 5 is a configuration diagram of a heat-up control device for a heating cylinder according to a conventional technique.

[Explanation of symbols]

 1 Heating Cylinder 2 Band Heater 3 Control Device 4 Temperature Control Device 5 Arithmetic Processing Device 6 Setting Device 7 ROM Memory 8 Temperature Sensor

Claims (4)

[Claims] 1. An automatic heat-up method for a heating cylinder of a molding machine, which heats up the heating cylinder by controlling energization to a heater provided in the heating cylinder based on an actual temperature measurement value of the heating cylinder of the molding machine. The molding work operation start time, the set temperature value of the heating cylinder required at the start of the molding work operation, the actual temperature measurement time of the heating cylinder, and the temperature of the set temperature value and the actual temperature measurement value of the heating cylinder. Based on the difference and the data of the time required to heat up the heating cylinder corresponding to this to the set temperature value, the actual temperature of the heating cylinder is measured before the actual temperature measurement time of the molding work operation start time. , It is necessary to calculate the temperature difference between the actual temperature measurement value and the set temperature value, and to heat up the heating cylinder to the set temperature value based on this temperature difference. The heating time of the heating cylinder is started before the molding work operation start time by the calculated time, and the heating of the heating cylinder is automatically performed by the molding work operation start time. An automatic heat-up method for a heating cylinder of a molding machine, characterized by being completed. 2. The method for automatically heating a heating cylinder of a molding machine according to claim 1, wherein the heating cylinder heat capacity and heater capacity differ depending on the model and model of the molding machine, and the heating fluctuates depending on the region and season. An automatic heat-up method for a heating cylinder of a molding machine, characterized in that heat-up of the heating cylinder is automatically completed based on a plurality of data that can correspond to the temperature drop rate of the cylinder. 3. A temperature measuring means for measuring an actual temperature of a heating cylinder of a molding machine is provided, and energization to a heater provided in the heating cylinder is controlled based on an actual temperature measurement value of the temperature measuring means. An automatic heat-up device for a heating cylinder of a molding machine that heats up the heating cylinder, wherein a molding work operation start time, a set temperature value of the heating cylinder required at the start of the molding work operation, an actual temperature measurement time of the heating cylinder, And a setting means for inputting and setting in advance data of a temperature difference between the set temperature value and an actual temperature measured value of the heating cylinder and the time required to heat up the corresponding heating cylinder to the set temperature value. Based on the data set by the setting means, the actual temperature of the heating cylinder is measured from the temperature measuring means before the actual temperature measuring time of the molding work operation start time. While inputting a constant value, calculate the temperature difference between this actual temperature measurement value and the set temperature value, and calculate the time required to heat up the heating cylinder to the set temperature value based on this temperature difference. An arithmetic processing unit that outputs a heat-up start command for the heating cylinder before the molding work operation start time by the calculated time, a storage unit that stores the calculation program, and a heat-up start command based on the heat-up start command. And a temperature control means for starting energization of the heater. 4. An automatic heat-up device for a heating cylinder of a molding machine according to claim 3, wherein the heating cylinder heat capacity and heater capacity differ depending on the model and model of the molding machine, and the heating fluctuates depending on the region and season. An automatic heat-up device for a heating cylinder of a molding machine, characterized in that a plurality of data that can correspond to a temperature drop rate of a cylinder are set, and an arithmetic processing is performed based on the plurality of data.