WO2023223563A1

WO2023223563A1 - Calculation device and program

Info

Publication number: WO2023223563A1
Application number: PCT/JP2022/021021
Authority: WO
Inventors: 京祐中村
Original assignee: ファナック株式会社
Priority date: 2022-05-20
Filing date: 2022-05-20
Publication date: 2023-11-23
Also published as: JPWO2023223563A1; JP7189395B1

Abstract

The objective of the present invention is to provide a calculation device and a program that make it possible to easily obtain, as an index of a molding condition, the relationship between heat transfer and shearing heat generation.　This calculation device calculates a ratio of the amount of heat applied to a molding material in an injection molding machine provided with a cylinder, a heater disposed around the cylinder, and a screw disposed inside the cylinder. The calculation device is provided with: a temperature acquisition unit that acquires, as temperature information, a temperature of the molding material before heating and a temperature of the molding material being injected from the cylinder; an operation information acquisition unit that acquires, as operation information, operation states of a motor operating a screw and a heater; a characteristic information acquisition unit that acquires, as characteristic information, characteristics of the molding material and the injection molding machine; a calculation unit that calculates a shearing heat generation amount of the screw and a heater heat transfer amount from the heater, on the basis of the temperature information, the operation information, and the characteristic information that have been acquired; and an output unit that outputs a calculation result.

Description

Arithmetic device and program

The present disclosure relates to an arithmetic device and a program.

Conventionally, injection molding machines have been known that melt pellets placed in a hopper in a cylinder and inject them into a mold. A heater is arranged around the outer periphery of the cylinder of the injection molding machine. When the heater heats the cylinder, the pellets (molding material) are melted. Further, by rotating a screw disposed within the cylinder, the molding material is kneaded and plasticized. In this way, the molding material is plasticized by the heat transfer from the heater and the shear heat generated by the shear action when the screw rotates.

As a control method for such an injection molding machine, a method has been proposed in which the temperature difference between the heating cylinder temperature based on the heater heat amount and the cylinder temperature measured in advance is detected as temperature information due to shear heat generation (for example, Patent Document 1 reference).

Japanese Patent Application Publication No. 2001-225372

By the way, the ratio of heat transfer and shear heat generation in the heat applied to the molding material is closely related to the molten state (quality) of the plasticized molding material. Generally, it is said that a molding material of good quality can be obtained if plasticization is performed mainly through heat transfer. On the other hand, if shear is the main component, plasticization can be performed efficiently.

In Patent Document 1, the energy amount of heat transfer and shear heat generation is not specifically calculated. Therefore, it is difficult to use heat transfer and shear heat generation to help determine molding conditions. Since the relationship between heat transfer and shear heat generation is a trade-off between quality and efficiency, it is preferable if the relationship between heat transfer and shear heat generation can be easily obtained as an index of molding conditions.

(1) The present disclosure provides an arithmetic device that calculates the proportion of heat added to a molding material in an injection molding machine that includes a cylinder, a heater placed around the cylinder, and a screw placed inside the cylinder. a temperature acquisition unit that acquires the temperature of the molding material before heating and the temperature of the molding material injected from the cylinder as temperature information; and a motor that operates the screw and operating states of the heater. an operation information acquisition section that acquires the characteristics of the molding material and the injection molding machine as characteristic information; and a characteristic information acquisition section that acquires the characteristics of the molding material and the injection molding machine as characteristic information, based on the acquired temperature information, operation information, and characteristic information , relates to an arithmetic device comprising: an arithmetic unit that calculates a shear heat amount of the screw and an amount of heater heat transfer from the heater; and an output unit that outputs the arithmetic results.

(2) The present disclosure also provides an injection molding machine that includes a cylinder, a heater disposed around the cylinder, and a screw disposed inside the cylinder, in which the ratio of the amount of heat applied to the molding material is calculated. A program for operating a computer as an arithmetic device, the computer operating a temperature acquisition unit that acquires the temperature of the molding material before heating and the temperature of the molding material injected from the cylinder as temperature information, and operating the screw. an operation information acquisition unit that acquires the operating state of the motor and the heater as operation information, a characteristic information acquisition unit that acquires the characteristics of the molding material and the injection molding machine as characteristic information, the acquired temperature information, and the operation. The present invention relates to a program that functions as a calculation unit that calculates the shear heat generation amount of the screw and the heater heat transfer amount from the heater based on the information and the characteristic information, and an output unit that outputs the calculation results.

According to the present disclosure, it is possible to provide an arithmetic device and a program that can easily obtain the relationship between heat transfer and shear heat generation as an index of molding conditions.

1 is a schematic diagram showing an injection molding machine including a control device according to an embodiment of the present disclosure. FIG. 3 is a schematic diagram showing the relationship between the amount of heat generated and the amount of heat dissipated by the heater of the control device according to one embodiment. FIG. 1 is a block diagram showing the configuration of a control device according to an embodiment. It is a graph showing the relationship between the flow of time, temperature, and calorific value of the control device of one embodiment. FIG. 3 is a screen diagram showing a screen output by the output unit of the control device according to one embodiment. It is another example of the screen diagram which shows the screen output by the output part of the control device of one embodiment. It is a flowchart which shows the flow of operation of a control device of one embodiment.

Hereinafter, an arithmetic device 1 and a program according to an embodiment of the present disclosure will be described with reference to FIGS. 1 to 7.
First, an injection molding machine controlled by this embodiment will be explained.
The injection molding machine 10 is a device that molds pellets (hereinafter also referred to as molding material) by melting them and injecting them into a mold (not shown). The injection molding machine 10 includes, for example, a cylinder 101, a heater 102, and a safety cover 103, as shown in FIG.

The cylinder 101 is, for example, a cylindrical body. The diameter of one axial end of the cylinder 101 decreases toward the end. The cylinder 101 has a screw (not shown) inside along the axial direction. The screw moves the molten molding material to one end of the cylinder 101 while stirring it.

The heater 102 is arranged around the cylinder 101. For example, a plurality of heaters 102 are arranged along the axial direction of the cylinder 101. Specifically, a plurality of heaters 102 are arranged from the nozzle portion at the axial tip of the cylinder 101 to the base end. In this embodiment, four heaters 102 are arranged along the axial direction so as to cover the outer periphery of the cylinder 101. The heater 102 heats the cylinder 101 to 200 degrees or more, for example.

The safety cover 103 is a concave body placed around the heater 102. The safety cover 103 is arranged to avoid contact with the heater 102, which is relatively hot.

According to the injection molding machine 10 described above, the molding material is melted inside the cylinder 101 which is heated to 200 degrees or more by the heater 102. The screw injects the molten molding material from one end of the cylinder 101 into the mold. Thereby, the injection molding machine 10 molds, for example, a plastic product. A safety cover 103 is arranged around the heater 102.

Here, as shown in FIG. 2, the total amount of heat E _M received by the molding material can be expressed by the following equation 1, where E _T is the amount of heat transferred from the heater 102, and E _S is the amount of heat generated by shearing.

The calculation device 1 according to the embodiment below calculates the amount of heat transfer _ET using the temperature change of the molding material and the above correlation. This calculates the ratio between the amount of heat transfer and the amount of heat generated by shearing. This makes it possible to easily obtain the relationship between heat transfer and shear heat generation as an index of molding conditions.

Next, an arithmetic device 1 according to an embodiment of the present disclosure will be described with reference to FIGS. 1 to 7.
The calculation device 1 is a device that calculates the proportion of heat added to the molding material in the injection molding machine 10. As shown in FIG. 3, the calculation device 1 includes a temperature acquisition section 11, a molding condition acquisition section 12, an operation information acquisition section 13, a characteristic information storage section 14, a characteristic information acquisition section 15, and a calculation section 16. , an output section 17, and a comparison section 18.

The temperature acquisition unit 11 is realized, for example, by the operation of a CPU. The temperature acquisition unit 11 acquires the temperature of the molding material before heating and the temperature of the molding material injected from the cylinder 101 as temperature information. The temperature acquisition unit 11 acquires, for example, the temperature of the molding material introduced into the material input port of the cylinder 101. The temperature acquisition unit 11 acquires, for example, the actual temperature measured by a sensor (not shown) disposed at the material input port of the cylinder 101. Further, the temperature acquisition unit 11 acquires, for example, the temperature of the molding material injected from the cylinder 101. The temperature acquisition unit 11 acquires, for example, an actual temperature measured by a sensor (not shown) placed at the tip of the cylinder 101. For example, the temperature acquisition unit 11 acquires, as temperature information, the temperature obtained by averaging the measured values of the molding material injected from the cylinder 101 over a predetermined period of time.

The molding condition acquisition unit 12 is realized by, for example, operating a CPU. The molding condition acquisition unit 12 acquires molding conditions set in the injection molding machine 10. The molding condition acquisition unit 12 acquires, for example, a metering stroke, metering back pressure, cooling time, metering rotation speed, etc. as molding conditions.

The operation information acquisition unit 13 is realized, for example, by the operation of a CPU. The operation information acquisition unit 13 acquires the operation state of the motor that operates the screw and the heater 102 as operation information. The operation information acquisition unit acquires the current load factor of the motor that rotationally drives the screw, the screw rotational angular velocity, and the operating rate of each heater 102 at each sampling period.

The characteristic information storage unit 14 is, for example, a storage medium such as a hard disk. The characteristic information storage unit 14 stores the characteristics of the injection molding machine 10 as characteristic information. The characteristic information storage unit 14 stores, for example, the specific heat of the molding material, the density at the time of melting, information about the motor (torque constant, reduction ratio, mechanical efficiency), information about the heater 102 (heater capacity), the shape of the heating cylinder 101 and the screw, etc. are stored as characteristic information.

The characteristic information acquisition unit 15 is realized, for example, by the operation of a CPU. The characteristic information acquisition unit 15 acquires characteristic information of the injection molding machine 10. The characteristic information acquisition unit 15 acquires the characteristic information by reading the characteristic information from the characteristic information storage unit 14, for example.

The calculation unit 16 is realized by, for example, operating a CPU. The calculation unit 16 calculates the energy change amount of the molding material, the shear heat amount of the screw, and the heater heat transfer amount from the heater 102 based on the acquired temperature information, operation information, and characteristic information, and calculates the shear heat amount. Calculate the ratio between and the heater heat transfer amount. Further, the calculation unit 16 calculates the energy change amount of the molding material, the shear heat generation amount of the screw, the heater heat generation amount by the heater 102, and the heater transmission from the heater 102, based on the acquired temperature information, operation information, and characteristic information. In addition to calculating the amount of heat, the ratio between the sum of the heater heat amount and the shear heat amount and the energy change amount, and the ratio between the heater heat amount and the heater heat transfer amount are calculated. The calculation unit 16 calculates, for example, the amount of energy change of the molding material, the shear heat amount of the screw, and the amount of heat transfer from the heater for each molding cycle. The calculation unit 16 calculates, for example, the temperature of the molding material before heating and the temperature of the molding material at the time of injection, which are obtained with a time difference between the timing when the molding material is introduced into the cylinder 101 and the time when the molding material moves to the injection port of the cylinder 101. Calculate the ratio using the temperature of the material as temperature information. That is, the calculation unit 16 calculates the ratio by using the temperature of the molding material before movement and the temperature of the molding material after movement as temperature information, taking into account the travel time from the injection of the molding material to the injection. Further, the calculation unit 16 calculates the shear heat generation amount using, for example, the time during which the shear torque is transmitted to the molding material by the screw. Further, the calculation unit 16 calculates the amount of heat generated by the heater using the heat transfer time to the molding material by the heater. For example, as shown in FIG. 4, the calculation unit 16 calculates calculation results for each predetermined section (one molding cycle). In FIG. 4, the calculation unit 16 calculates the amount of energy change, taking into consideration the travel time from the injection of the molding material to the injection, when the molding material input from the input port is injected in three cycles. ing. Furthermore, the shear heat generation amount and heater heat generation amount are determined using the operation information for three cycles. The calculation section 16 includes an energy change amount calculation section 161 , a shear heat generation amount calculation section 162 , a heater heat transfer amount calculation section 163 , a heater heat generation amount calculation section 164 , and a ratio calculation section 165 .

The energy change amount calculation unit 161 calculates the amount of heat used for plasticizing the molding material as the energy change amount of the molding material. For example, the energy change amount calculation unit 161 calculates the following number as the energy change amount E _M , the mass m of the molding material, the specific heat c of the molding material, and the temperature difference ΔT of the molding material between the material input port and the tip of the cylinder 101. Calculate 2. Here, the mass m of the molding material may be calculated by the product of the measured volume V and the melted density ρ of the molding material. Note that the specific heat c is not constant and changes depending on the temperature. The energy change calculation unit 161 performs calculation using, for example, the specific heat c determined from the average value of the inlet temperature and the outlet temperature.

The shear calorific value calculation unit 162 calculates the shear calorific value based on the operation information and the characteristic information. The shear calorific value calculation unit 162 calculates the shear calorific value E _S by, for example, time-integrating the screw torque T and the rotational angular velocity ω during metering. In order to accurately calculate the torque applied to the molding material, the shear calorific value calculation unit 162 calculates the friction torque from the screw torque at the time of measurement by using the torque at the time of screw idling measured in advance at each rotation speed. The shear heat generation amount _ES may be calculated by subtracting it. The shear calorific value calculation unit 162 calculates the shear calorific value E _S by the torque constant K _T of the screw rotating motor, the motor current value r _M at the time of measurement, the motor current value r _F at the time of idling, and the deceleration between the motor and the screw. The ratio R, the rotational angular velocity ω of the screw, the mechanical efficiency η, the measurement start time T ₀ , and the measurement end time T ₁ may be calculated using Equation 3 or Equation 4 below. Note that the current value _rF of the motor during idling may be a value measured in advance according to the model, screw size, screw shape, and rotation speed. Further, the shear heat generation amount _ES may be determined by further subtracting the acceleration torque from the screw torque.

The heater heat transfer amount calculating section 163 calculates the heat transfer amount of the heater 102. The heater heat transfer amount calculation unit 163 calculates the heater heat transfer amount _{E T} _by finding the difference between the shear heat generation amount E S from the calculated energy change amount E _M.

The heater calorific value calculation unit 164 calculates the total calorific value E _Hi of the heater 102 by integrating the product of the operating rate of each heater 102 and the capacity of the heater 102 over time. The heater calorific value calculation unit 164 calculates the following Equation 5 using the capacity W _i of the heater 102, the operating rate r _i of each heater 102, the calculation start time t ₂ , and the calculation end time t ₃ . good. Furthermore, the heater heat generation amount calculation unit 164 may calculate the total heat generation amount E _Hi of the heater 102 by correcting the power supply voltage during molding acquired as the operation information.

The ratio calculation unit 165 calculates the ratio between the heat transfer amount of the heater 102 and the shear heat generation amount in the energy change amount of the molding material. Further, the ratio calculation unit 165 calculates the plasticization energy efficiency, which indicates the efficiency of energy transmitted to the molding material during plasticization. The ratio calculation unit 165 calculates the plasticizing energy efficiency, for example, by calculating the ratio of the sum of the heat generation amount E _H of the heater 102 and the shear heat generation amount E _S and the energy change amount E _M. Further, the ratio calculation unit 165 calculates the energy efficiency of the heater during plasticization that is transmitted to the molding material. The ratio calculation unit 165 calculates the heater energy efficiency, for example, by calculating the ratio between the heat generation amount _EH of the heater 102 and the heat transfer amount _Er of the heater 102.

The output unit 17 is realized by, for example, operating a CPU. The output unit 17 outputs the calculation result. The output unit 17 outputs the calculation result to a display device such as a display. The output unit 17 outputs, for example, the calculation results of the calculation unit 16 in the form of a scatter diagram for each predetermined section. Further, the output unit 17 arranges the calculation results by the calculation unit 16 in chronological order, and outputs a cursor that can select the arranged calculation results in chronological order. The output unit 17 shows the calculation result using, for example, a numerical value, a pie chart, or a bar graph. Further, the output unit 17 outputs the calculation results for each predetermined section (cycle) as a scatter diagram, as shown in FIG. 5, for example. The output unit 17 selectably displays each cycle using a cursor, and also displays the amount of heat transfer, the amount of heat generated by shearing, the ratio of the amount of heat transferred and the amount of heat generated by shearing, the plasticization energy efficiency, the energy efficiency of the heater 102, and outputs the molding conditions.

The comparison unit 18 is realized by, for example, operating a CPU. The comparison unit 18 compares molding conditions selected by a plurality of cursors. For example, as shown in FIG. 6, the comparison unit 18 compares the calculation results and molding conditions of a predetermined section selected by a plurality of cursors.

According to the above comparison unit 18 and output unit 17, the output unit 17 outputs different molding conditions among the plurality of cursors. For example, as shown in FIG. 6, the output unit 17 outputs different molding conditions regarding the metering rotation speed and metering back pressure in two predetermined sections.

Next, the flow of processing by the arithmetic device 1 will be explained with reference to FIG.
First, the characteristic information acquisition unit 15 acquires characteristic information (step S1). Next, the temperature acquisition unit 11 acquires temperature information (step S2). Next, the molding condition acquisition unit 12 acquires molding conditions (step S3).

Next, the energy change amount calculation unit 161 calculates the energy change amount (step S4). Next, the heater calorific value calculation unit 164 calculates the heater calorific value (step S5). Next, the shear calorific value calculation unit 162 calculates the shear calorific value (step S6). Next, the heater heat transfer amount calculation unit 163 calculates the heater heat transfer amount (step S7). Next, the ratio calculation unit 165 calculates the ratio between the shear heat generation amount and the heater heat transfer amount, the ratio between the sum of the heater heat generation amount and the shear heat generation amount and the energy change amount, and the ratio between the heater heat generation amount and the heater heat transfer amount ( Step S8). Next, the output unit 17 outputs the calculation result (step S9).

Next, it is determined whether or not to end (step S10). If it ends (step S10: YES), the process according to this flow ends. On the other hand, if the process does not end (step S10: NO), the process returns to step S2.

Next, the program of this embodiment will be explained.
Each configuration included in the arithmetic device 1 can be realized by hardware, software, or a combination thereof. Here, being realized by software means being realized by a computer reading and executing a program.

The program can be stored and provided to a computer using various types of non-transitory computer readable media. Non-transitory computer-readable media include various types of tangible storage media. Examples of non-transitory computer-readable media are magnetic recording media (e.g., flexible disks, magnetic tapes, hard disk drives), magneto-optical recording media (e.g., magneto-optical disks), CD-ROMs (Read Only Memory), CD-ROMs, R, CD-R/W, semiconductor memory (for example, mask ROM, PROM (programmable ROM), EPROM (erasable PROM), flash ROM, RAM (random access memory)). The display program may also be provided to the computer via various types of transitory computer readable media. Examples of transitory computer-readable media include electrical signals, optical signals, and electromagnetic waves. The temporary computer-readable medium can provide the program to the computer via wired communication channels, such as electrical wires and fiber optics, or wireless communication channels.

As described above, according to the arithmetic device 1 and the program according to the embodiment, the following effects are achieved.
(1) In an injection molding machine 10 that includes a cylinder 101, a heater 102 arranged around the cylinder 101, and a screw arranged inside the cylinder 101, a calculation device 1 that calculates the ratio of the amount of heat added to the molding material A temperature acquisition unit 11 that acquires the temperature of the molding material before heating and the temperature of the molding material injected from the cylinder 101 as temperature information, and the operating state of the motor and heater 102 that operate the screw as the operation information. An operation information acquisition unit 13 acquires the characteristics of the molding material and the injection molding machine 10, and a characteristic information acquisition unit 15 acquires the characteristics of the molding material and the injection molding machine 10 as characteristic information. A calculation unit 16 that calculates the amount of energy change, the shear heat generation amount of the screw, and the heater heat transfer amount from the heater 102, and also calculates the ratio of the shear heat generation amount and the heater heat transfer amount, and an output unit 17 that outputs the calculation results. , is provided. Thereby, the relationship between heat transfer and shear heat generation can be easily obtained as an index of molding conditions.

(2) The calculation unit 16 calculates the amount of energy change of the molding material based on the acquired temperature information, operation information, and characteristic information. Thereby, energy efficiency for the molding material can be easily obtained.

(3) The calculation unit 16 calculates the ratio between the shear heat generation amount and the heater heat transfer amount, and the output unit 17 outputs the calculated ratio. Thereby, the relationship between heat transfer and shear heat generation can be obtained as a value that is easier to understand as an index of molding conditions.

(4) The calculation unit 16 calculates the ratio between the sum of the heater heat generation amount and the shear heat generation amount and the energy change amount, and the ratio of at least one of the heater heat generation amount and the heater heat transfer amount, and the output unit 17 Output the calculated ratio. This makes it possible to easily obtain more detailed information regarding the indicators of molding conditions.

(5) The temperature acquisition unit 11 acquires the temperature obtained by averaging the actual measured values of the molding material injected from the cylinder 101 over a predetermined period of time as temperature information. Thereby, the temperature of the molding material can be obtained with high accuracy.

(6) The calculation unit 16 uses the temperature of the molding material before heating and at the time of injection, which is obtained by taking a time interval between the timing at which the molding material is introduced into the cylinder 101 and the timing at which it moves to the injection port of the cylinder 101, as temperature information. Calculate percentages. As a result, it is possible to focus on the molding material input from the input port and obtain the temperature change of the molding material injected after moving inside the cylinder 101 as temperature information, so the amount of energy change can be calculated with high accuracy. Can be done.

(7) The calculation unit 16 calculates the shear heat generation amount using the transmission time of the shear torque to the molding material by the screw. Thereby, the shear heat generation amount can be calculated with high accuracy.

(8) The calculation unit 16 calculates the amount of heat generated by the heater using the heat transfer time to the molding material by the heater 102. Thereby, the amount of heat generated by the heater can be calculated with high accuracy.

(9) The calculation unit 16 calculates the amount of energy change of the molding material, the shear heat amount of the screw, and the amount of heat transfer from the heater for each cycle, with metering and injection as one cycle. Thereby, the index of the molding conditions can be calculated for each cycle, so that later verification of the molding conditions can be made more efficient.

(10) The output unit 17 outputs the calculation results of the calculation unit 16 in the form of a scatter diagram for each predetermined section. Thereby, the calculation result of the calculation unit 16 can be outputted more clearly.

(11) The calculation device 1 further includes a molding condition acquisition unit 12 that acquires molding conditions set in the injection molding machine 10, and the output unit 17 arranges and outputs the calculation results by the calculation unit 16 in chronological order. At the same time, it outputs a cursor that allows the placed calculation results to be selected in chronological order and molding conditions corresponding to the calculation results selected by the cursor. Thereby, the calculation result of the calculation unit 16 can be outputted more clearly.

(12) The arithmetic device 1 further includes a comparison unit 18 that compares molding conditions selected by a plurality of cursors, and an output unit 17 outputs molding conditions that differ between the plurality of cursors. Thereby, the calculation result of the calculation unit 16 can be outputted more clearly.

Although preferred embodiments of the arithmetic device and program of the present disclosure have been described above, the present disclosure is not limited to the above-described embodiments and can be modified as appropriate.
For example, in the above embodiment, the calculation unit 16 calculates the ratio between the sum of the heater heat generation amount and the shear heat generation amount and the energy change amount, and the ratio of at least one of the heater heat generation amount and the heater heat transfer amount. It's okay.

Furthermore, in the embodiment described above, the temperature acquisition unit 11 may acquire the actual temperature measured by a control temperature sensor for the molding machine to control the temperature of the material input port. Further, the temperature acquisition unit 11 may acquire the temperature (constant) input to the molding machine as the set temperature of the material input port. Furthermore, the temperature acquisition unit 11 may acquire any temperature (constant) input by the user. As a result, an additional sensor for measuring the temperature of the resin is not required, so that costs can be reduced.

Furthermore, in the embodiment described above, the temperature acquisition unit 11 may acquire the actual temperature measured by a control temperature sensor for the molding machine to control the temperature at the tip of the heating cylinder 101. Further, the temperature acquisition unit 11 may acquire the temperature (constant) input to the molding machine as the set temperature of the tip of the heating cylinder 101. Furthermore, the temperature acquisition unit 11 may acquire any temperature (constant) input by the user. This eliminates the need for an additional sensor to measure the temperature of the resin, thereby reducing costs, freeing molding conditions from restrictions due to sensor strength, and avoiding reduction in cylinder strength.

Furthermore, in the above embodiment, the mass of the molded product measured by the user may be used as the mass m of the molding material. Although this increases the time and effort required for measurement, it is possible to accurately measure the mass of the weighed resin. Since the mass of the molded product during injection molding varies very little, it may be set to a constant value.

Further, in the above embodiment, the calculation unit 16 is not limited to one cycle of the injection molding machine 10, but calculates the energy change amount of the molding material, the shear heat amount of the screw, the heater heat transfer amount from the heater 102, and calculates several cycles at once. , the ratio between the shear heat generation amount and the heater heat transfer amount, the ratio between the sum of the heater heat generation amount and the shear heat generation amount and the energy change amount, and the ratio between the heater heat generation amount and the heater heat transfer amount may be calculated. Thereby, calculation results can be stabilized by performing calculations for multiple cycles at once. For example, when comparing ratios under different molding conditions, it is desirable to compare values for multiple cycles.

Furthermore, in the above embodiment, the temperature acquisition unit 11 acquires the temperature of any one of the injection nozzle (not shown), the nozzle adapter (not shown), and the tip of the cylinder 101 of the injection molding machine 10. You can do it. Depending on the size of the cylinder volume and injection volume, which part of the nozzle, nozzle adapter, or cylinder the resin is present in the most immediately before injection changes. Therefore, calculation accuracy can be improved by using appropriate component temperatures accordingly.

Furthermore, in the embodiment described above, the temperature acquisition unit 11 may acquire the temperature of the molding material to be injected and the temperature of the input port using a plurality of sensors. The temperature acquisition unit 11 may use only the value of a specific sensor among the plurality of sensors. Further, the temperature acquisition unit 11 may use an average value of a plurality of sensors. By acquiring data from multiple sensors, it is possible to calculate the amount of energy change with higher accuracy.

Additionally, the temperature acquisition unit 11 may directly measure the temperature of the material. Accuracy can be improved by directly measuring the temperature of the material. Moreover, the temperature acquisition unit 11 may acquire the temperature inside the wall. Thereby, temperature can be measured without considering the strength of the sensor.

Furthermore, when multiple control point temperatures can be used for the nozzle, nozzle adapter, heating cylinder 101, etc., the temperature acquisition unit 11 may acquire only the temperature of a specific control point, or may acquire the average value or the like. good. Further, when a plurality of temperature settings can be used, the temperature acquisition unit 11 may acquire only a specific temperature setting, or may acquire an average value or the like. In cases where the measured resin is evenly distributed in each part, accuracy can be improved by using the average value of each control point temperature or set temperature.

Furthermore, in the above embodiment, the ratio calculation unit 165 may convert the calculation result into a score. The output unit 17 may output the scored results. The ratio calculation unit 165 may score the ratio between heat transfer and shearing, or energy efficiency, for example. For example, the ratio calculation unit 165 may score the appropriateness of the ratio of heat transfer and shearing with respect to a preset target value emphasizing quality or molding efficiency. Further, the ratio calculation unit 165 may score the suitability of energy efficiency in actual operation with respect to energy efficiency set in advance as a target value.

1 Arithmetic device 10 Injection molding machine 11 Temperature acquisition section 12 Molding condition acquisition section 13 Operation information acquisition section 14 Characteristic information acquisition section 16 Arithmetic section 17 Output section 101 Cylinder 102 Heater

Claims

In an injection molding machine including a cylinder, a heater disposed around the cylinder, and a screw disposed inside the cylinder, an arithmetic device that computes the proportion of heat added to a molding material,
a temperature acquisition unit that acquires the temperature of the molding material before heating and the temperature of the molding material injected from the cylinder as temperature information;
an operation information acquisition unit that acquires, as operation information, a motor that operates the screw and an operation state of the heater;
a characteristic information acquisition unit that acquires characteristics of the molding material and the injection molding machine as characteristic information;
a calculation unit that calculates a shear heat amount of the screw and a heater heat transfer amount from the heater based on the acquired temperature information, the operation information, and the characteristic information;
an output section that outputs the calculation results;
A calculation device comprising:
The arithmetic device according to claim 1, wherein the arithmetic unit calculates the amount of energy change of the molding material based on the acquired temperature information, operation information, and characteristic information.
The calculation unit calculates a ratio between the shear heat amount and the heater heat transfer amount,
The arithmetic device according to claim 1, wherein the output section outputs the calculated ratio.
The calculation unit calculates a ratio between the sum of the heater heat generation amount and the shear heat generation amount by the heater and the energy change amount, and a ratio of at least one of the heater heat generation amount and the heater heat transfer amount,
The arithmetic device according to claim 2, wherein the output section outputs the calculated ratio.
The arithmetic device according to claim 1, wherein the temperature acquisition unit acquires, as temperature information, a temperature obtained by averaging actual measured values of the molding material injected from the cylinder over a predetermined period of time.
The calculation unit calculates the temperature of the molding material before heating and the temperature of the molding material at the time of injection, which are obtained after a time interval between the timing at which the molding material is introduced into the cylinder and the timing at which the molding material moves to the injection port of the cylinder. The calculation device according to claim 1, which calculates a ratio using temperature as temperature information.
The computing device according to claim 1, wherein the computing unit computes the shear heat generation amount using the transmission time of shear torque to the molding material by the screw.
The arithmetic device according to claim 4, wherein the arithmetic unit calculates the amount of heat generated by the heater using the heat transfer time to the molding material by the heater.
The arithmetic device according to claim 2, wherein the arithmetic unit calculates an energy change amount of the molding material, a shear heat amount of the screw, and a heater heat transfer amount from the heater for each molding cycle.
The arithmetic device according to claim 1, wherein the output section outputs the arithmetic results of the arithmetic section in the form of a scatter diagram for each predetermined section.
further comprising a molding condition acquisition unit that acquires molding conditions set in the injection molding machine,
The output unit arranges and outputs the calculation results by the calculation unit in chronological order, and also corresponds to a cursor that can select the arranged calculation results in chronological order and the calculation result selected by the cursor. The arithmetic device according to claim 1, which outputs molding conditions.
further comprising a comparison unit that compares the molding conditions selected by a plurality of cursors,
The arithmetic device according to claim 11, wherein the output unit outputs different molding conditions among a plurality of cursors.
A program that causes a computer to operate as a calculation device that calculates the proportion of heat added to molding material in an injection molding machine that includes a cylinder, a heater placed around the cylinder, and a screw placed inside the cylinder. There it is,
The computer,
a temperature acquisition unit that acquires the temperature of the molding material before heating and the temperature of the molding material injected from the cylinder as temperature information;
an operation information acquisition unit that acquires, as operation information, a motor that operates the screw and an operation state of the heater;
a characteristic information acquisition unit that acquires characteristics of the molding material and the injection molding machine as characteristic information;
a calculation unit that calculates a shear heat amount of the screw and a heater heat transfer amount from the heater based on the acquired temperature information, the operation information, and the characteristic information;
an output section that outputs the calculation results;
A program that functions as