Calculation device and program

Abstract

Provided are a calculation device and a program with which it is possible to easily obtain the relationship between heat transfer and shear heat as an index for molding conditions. A calculation device that calculates the proportion 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 being provided with: a temperature acquisition unit that acquires the amount of heat applied to the molding material; the temperature acquisition unit 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, operation states of a motor and a heater that operate the screw; 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 on the basis of the acquired temperature information, operation information, and characteristic information; and an output unit that outputs the calculation result.

Description

Technical Field

[0001] The present disclosure relates to a computing device and a program. Background Art

[0002] Conventionally, there is known an injection molding machine that melts pellets placed in a hopper in a barrel and then injects them into a mold. A heater is disposed on the periphery of the barrel of the injection molding machine. The heater heats the barrel, thereby melting the pellets (molding material). In addition, the molding material is kneaded and plasticized by rotating a screw disposed in the barrel. In this way, the molding material is plasticized by heat transfer from the heater and shear heat generated by the shearing action of the screw when it rotates.

[0003] As a control method of such an injection molding machine, a method of detecting the temperature difference between a heating cylinder temperature in heater heat and a cylinder temperature measured in advance as temperature information due to shear heat has been proposed (for example, see Patent Document 1).

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2001-225372 Summary of the invention

[0007] Problem that the invention aims to solve

[0008] In addition, the ratio of heat transfer and shear heat in the heat applied to the molding material is closely related to the molten state (quality) of the molding material after plasticization. Generally speaking, if heat transfer is used as the main method for plasticization, a molding material with good quality can be obtained. On the other hand, when shear heat is used as the main method, plasticization can be performed effectively.

[0009] In Patent Document 1, the energy of heat transfer and shear heat is not specifically calculated. Therefore, it is difficult to use heat transfer and shear heat to assist in determining molding conditions. The relationship between heat transfer and shear heat is a trade-off relationship between quality and efficiency. Therefore, it is preferable if the relationship between heat transfer and shear heat can be easily obtained as an indicator of molding conditions.

[0010] Solutions for solving problems

[0011] (1) The present disclosure relates to a computing device for computing the ratio of heat applied to a molding material in an injection molding machine, the injection molding machine comprising a barrel, a heater arranged around the barrel, and a screw arranged inside the barrel, the computing device comprising: a temperature acquisition unit for acquiring the temperature of the molding material before heating and the temperature of the molding material injected from the barrel as temperature information; an action information acquisition unit for acquiring the action states of a motor and the heater for moving the screw as action information; a characteristic information acquisition unit for acquiring characteristics of the molding material and the injection molding machine as characteristic information; a computing unit for computing the shear heat of the screw and the heater heat transfer from the heater based on the acquired temperature information, the action information, and the characteristic information; and an output unit for outputting the calculation result.

[0012] (2) In addition, the present disclosure relates to a program that causes a computer to operate as a computing device that calculates the ratio of heat applied to a molding material in an injection molding machine, wherein the injection molding machine includes a barrel, a heater arranged around the barrel, and a screw arranged inside the barrel, and the program causes the computer to function as the following parts: a temperature acquisition part that acquires the temperature of the molding material before heating and the temperature of the molding material injected from the barrel as temperature information; an action information acquisition part that acquires the action states of the motor that moves the screw and the heater as action information; a characteristic information acquisition part that acquires the characteristics of the molding material and the injection molding machine as characteristic information; a computing part that calculates the shear heat of the screw and the heater heat transfer from the heater based on the acquired temperature information, the action information, and the characteristic information; and an output part that outputs the calculation result.

[0013] Effects of the Invention

[0014] According to the present disclosure, it is possible to provide a computing device and a program that can easily obtain the relationship between heat transfer and shear heat as an index of molding conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram showing an injection molding machine including a control device according to an embodiment of the present disclosure.

[0016] Figure 2 This is a schematic diagram showing the relationship between the amount of heat generated and the amount of heat dissipated by a heater of a control device according to one embodiment.

[0017] Figure 3 This is a block diagram showing the structure of a control device according to one embodiment.

[0018] Figure 4 This is a graph showing the relationship between the passage of time, temperature, and calorific value of a control device according to one embodiment.

[0019] Figure 5 This is a screen diagram showing a screen output by an output unit of a control device according to one embodiment.

[0020] Figure 6 This is another example of a screen diagram showing a screen output by the output unit of the control device according to one embodiment.

[0021] Figure 7 This is a flowchart showing the operation flow of the control device according to one embodiment. DETAILED DESCRIPTION

[0022] Below, refer to Figures 1 to 7 A calculation device 1 and a program according to an embodiment of the present disclosure will be described.

[0023] First, the injection molding machine controlled by this embodiment will be described.

[0024] The injection molding machine 10 is a device that performs molding by melting pellets (hereinafter, also referred to as molding material) and injecting them into a mold (not shown). Figure 1 As shown, the injection molding machine 10 includes, for example, a cylinder 101 , a heater 102 , and a safety cover 103 .

[0025] The barrel 101 is, for example, a cylindrical body. The diameter of one end of the barrel 101 in the axial direction decreases toward the end. The barrel 101 has a screw (not shown) inside along the axial direction. The screw stirs the molten molding material while moving the molten molding material toward one end of the barrel 101.

[0026] The heater 102 is arranged around the barrel 101. For example, a plurality of heaters 102 are arranged along the axial direction of the barrel 101. Specifically, a plurality of heaters 102 are arranged from the nozzle portion at the axial front end to the base end of the barrel 101. In the present embodiment, four heaters 102 are arranged along the axial direction in a manner covering the outer circumference of the barrel 101. The heater 102 heats the barrel 101 to, for example, 200 degrees or more.

[0027] The safety cover 103 is a concave body disposed around the heater 102. The safety cover 103 is disposed to prevent the heater 102 having a high temperature from being touched.

[0028] According to the above injection molding machine 10, the molding material is melted inside the barrel 101 heated to more than 200 degrees by the heater 102. The screw injects the molten molding material into the mold from one end of the barrel 101. Thus, the injection molding machine 10 performs molding of a plastic product, for example. A safety cover 103 is arranged around the heater 102.

[0029] Here, if Figure 2 As shown, when the heat transfer from the heater 102 is set to E T , set the shear heat to E S The total heat E received by the molding material can be expressed by the following formula 1: M .

[0030] [Number 1]

[0031] E M =E T +E S

[0032] The calculation device 1 according to the following embodiment calculates the heat transfer value E using the temperature change of the molding material and the above correlation. T Thus, the ratio of the heat transfer amount to the shear heat amount is calculated. Thus, it is possible to easily obtain the relationship between the heat transfer amount and the shear heat amount as an indicator of the molding conditions.

[0033] Next, refer to Figures 1 to 7 A computing device 1 according to an embodiment of the present disclosure will be described.

[0034] The calculation device 1 is a device for calculating the ratio of heat applied to the molding material in the injection molding machine 10. Figure 3 As shown, the computing device 1 includes a temperature acquiring unit 11 , a molding condition acquiring unit 12 , an operation information acquiring unit 13 , a characteristic information storage unit 14 , a characteristic information acquiring unit 15 , a computing unit 16 , an output unit 17 , and a comparing unit 18 .

[0035] The temperature acquisition unit 11 is realized by, for example, operating 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 barrel 101 as temperature information. The temperature acquisition unit 11 acquires, for example, the temperature of the molding material put into the material inlet of the barrel 101. The temperature acquisition unit 11 acquires, for example, the measured temperature of a sensor (not shown) arranged at the material inlet of the barrel 101. In addition, the temperature acquisition unit 11 acquires, for example, the temperature of the molding material injected from the barrel 101. The temperature acquisition unit 11 acquires, for example, the measured temperature of a sensor (not shown) arranged at the front end of the barrel 101. The temperature acquisition unit 11 acquires, for example, the temperature obtained by averaging the measured values ​​of the molding material injected from the barrel 101 within a specified time as temperature information.

[0036] The molding condition acquisition unit 12 is realized by, for example, operating a CPU. The molding condition acquisition unit 12 acquires molding conditions set for the injection molding machine 10. The molding condition acquisition unit 12 acquires, for example, metering stroke, metering back pressure, cooling time, metering rotation speed, etc. as molding conditions.

[0037] The motion information acquisition unit 13 is implemented by, for example, a CPU operating. The motion information acquisition unit 13 acquires the operating states of the motor and the heater 102 that operate the screw as motion information. The motion information acquisition unit acquires the current load factor of the motor that drives the screw to rotate, the screw rotation angular velocity, and the operating rate of each heater 102 at each sampling period.

[0038] 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 when melted, information related to the motor (torque constant, reduction ratio, mechanical efficiency), information related to the heater 102 (heater capacity), the shape of the heating barrel 101 and the screw, etc. as characteristic information.

[0039] The characteristic information acquisition unit 15 is realized by, for example, 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 characteristic information by, for example, reading the characteristic information from the characteristic information storage unit 14.

[0040] The calculation unit 16 is implemented by, for example, operating a CPU. The calculation unit 16 calculates the energy change of the molding material, the shear heat of the screw, and the heater heat transfer from the heater 102 based on the acquired temperature information, motion information, and characteristic information, and calculates the ratio of the shear heat to the heater heat transfer. In addition, the calculation unit 16 calculates the energy change of the molding material, the shear heat of the screw, the heater heat generated by the heater 102, and the heater heat transfer from the heater 102 based on the acquired temperature information, motion information, and characteristic information, and calculates the ratio of the sum of the heater heat and the shear heat to the energy change, and the ratio of the heater heat to the heater heat transfer. The calculation unit 16, for example, calculates the energy change of the molding material, the shear heat of the screw, and the heater heat transfer from the heater for each molding cycle. The calculation unit 16, for example, calculates the ratio using the temperature of the molding material before heating and the temperature of the molding material during injection, which are acquired at the following time difference as temperature information: the time difference from the moment when the molding material is put into the barrel 101 to the moment when the molding material moves to the injection port of the barrel 101. The calculation unit 16 considers the movement time of the molding material from the time of input to the time of injection, and uses the temperature of the molding material before the movement and the temperature of the molding material after the movement as temperature information to calculate the ratio. In addition, the calculation unit 16 uses, for example, the transmission time of the shear torque from the screw to the molding material to calculate the shear heat. In addition, the calculation unit 16 uses the heat transfer time from the heater to the molding material to calculate the heater heat. Figure 4 As shown in FIG. 1 , the calculation unit 16 calculates the calculation result for each predetermined interval (one molding cycle). Figure 4 For example, when the molding material introduced from the inlet is injected in three cycles, the calculation unit 16 calculates the energy change amount by taking into account the movement time of the molding material from the introduction to the injection. In addition, the shear heat amount and the heater heat amount are calculated using the motion information of the three cycles. The calculation unit 16 includes an energy change amount calculation unit 161, a shear heat amount calculation unit 162, a heater heat transfer calculation unit 163, a heater heat amount calculation unit 164, and a ratio calculation unit 165.

[0041] The energy change amount calculation unit 161 calculates the amount of heat used in plasticizing the molding material as the energy change amount of the molding material. The mass of the molding material is set to m, the specific heat of the molding material is set to c, and the temperature difference of the molding material between the material input port and the front end of the barrel 101 is set to ΔT. The energy change amount calculation unit 161 calculates the energy change amount E by, for example, the following equation 2: MHere, the mass m of the molding material can also be calculated based on the product of the measured volume V and the density ρ of the molding material when it is molten. In addition, the specific heat c is not fixed and changes with temperature. The energy change amount calculation unit 161 uses the specific heat c calculated based on the average value from the inlet temperature to the outlet temperature for calculation.

[0042] [Number 2]

[0043] E M =m·c·ΔT

[0044] The shear heat calculation unit 162 calculates the shear heat amount based on the operation information and the characteristic information. The shear heat calculation unit 162 calculates the shear heat amount E by, for example, integrating the screw torque T and the rotational angular velocity ω during metering over time. S In order to accurately calculate the torque applied to the molding material, the shear heat calculation unit 162 may use the torque of the screw when idling, which is measured in advance at each rotation speed, and calculate the shear heat E by subtracting the friction torque from the screw torque during metering. S Alternatively, the torque constant of the screw rotary motor may be set to K T , the current value of the motor during measurement is set to r M , the current value of the motor when idling is set to r F , the reduction ratio between the motor and the screw is set to R, the rotational angular velocity of the screw is set to ω, the mechanical efficiency is set to η, and the metering start time is set to T 0 , set the measurement end time as T 1 The shear heat calculation unit 162 calculates the shear heat E by the following formula 3 or formula 4: S In addition, the current value r of the motor when idling F It can be a value measured in advance based on the machine model, screw size, screw shape, and rotation speed. In addition, the shear heat E can be calculated by further subtracting the acceleration torque from the screw torque. S .

[0045] [Number 3]

[0046]

[0047] [Number 4]

[0048]

[0049] The heater heat transfer calculation unit 163 calculates the heat transfer amount of the heater 102. The heater heat transfer calculation unit 163 calculates the heat transfer amount of the heater 102 based on the calculated energy change amount E M Calculate the shear heat E S The difference between the heat transfer rate and the heat transfer E of the heater is calculated. T .

[0050] The heater heat generation calculation unit 164 calculates the total heat generation E of the heaters 102 by integrating the product of the operation rate of each heater 102 and the capacity of the heater 102 over time. Hi Alternatively, the capacity of the heater 102 may be set to W. i , the operating rate of each heater 102 is set to r i , set the calculation start time to t 2 , set the calculation end time to t 3 The heater heat generation calculation unit 164 calculates the total heat generation E by performing the following equation 5: Hi In addition, the heater heat generation calculation unit 164 may also calculate the total heat generation E of the heater 102 by correcting the power supply voltage during molding acquired as the operation information. Hi .

[0051] [Number 5]

[0052]

[0053] The ratio calculation unit 165 calculates the ratio of the heat transfer amount of the heater 102 to the shear heat amount in the energy change of the molding material. In addition, the ratio calculation unit 165 calculates the plasticization energy efficiency which indicates the efficiency of the energy transferred to the molding material during plasticization. The ratio calculation unit 165 calculates the heat generation E of the heater 102, for example. H and shear heat E S The sum of the energy change E M The ratio calculation unit 165 calculates the energy efficiency of the heater during the plasticization of the molding material. The ratio calculation unit 165 calculates the heat generation E of the heater 102, for example. H and the heat transfer E of the heater 102 r The ratio of the two is used to calculate the heater energy efficiency.

[0054] The output unit 17 is implemented, for example, by the operation of the 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 the calculation result of the calculation unit 16 in a scatter diagram for each specified interval. In addition, the output unit 17 arranges the calculation results of the calculation unit 16 in a time series and outputs a cursor that can select the arranged calculation results along the time series. The output unit 17 displays the calculation result in a numerical value, a pie chart, or a bar chart. In addition, as Figure 5As shown, the output unit 17 outputs the calculation result of each specified interval (cycle) in the form of a scatter diagram, for example. The output unit 17 displays each cycle in a manner that allows the cursor to be used to select each cycle, and outputs the heat transfer amount, shear heat amount, ratio of heat transfer amount to shear heat amount, plasticization energy efficiency, energy efficiency of the heater 102, and molding conditions in the selected cycle.

[0055] The comparison unit 18 is implemented by, for example, a CPU operating. The comparison unit 18 compares the molding conditions selected by the plurality of cursors. Figure 6 As shown, the comparison unit 18 compares the calculation results and molding conditions of the predetermined sections selected by the plurality of cursors, for example.

[0056] According to the above comparison unit 18 and output unit 17, the output unit 17 outputs different molding conditions between the plurality of cursors. Figure 6 As shown, the output unit 17 outputs, for example, molding conditions in which the metering rotation speed and the metering back pressure are different between two predetermined sections.

[0057] Next, refer to Figure 7 The flow of processing performed by the computing device 1 will be described.

[0058] 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).

[0059] Next, the energy change amount calculation unit 161 calculates the energy change amount (step S4). Next, the heater heat value calculation unit 164 calculates the heater heat value (step S5). Next, the shear heat value calculation unit 162 calculates the shear heat value (step S6). Next, the heater heat transfer calculation unit 163 calculates the heater heat transfer (step S7). Next, the ratio calculation unit 165 calculates the ratio of the shear heat value to the heater heat transfer value, the ratio of the sum of the heater heat value and the shear heat value to the energy change amount, and the ratio of the heater heat value to the heater heat transfer value (step S8). Next, the output unit 17 outputs the calculation results (step S9).

[0060] Next, it is determined whether the process is completed (step S10). If the process is completed (step S10: Yes), the process of this flow is completed. On the other hand, if the process is not completed (step S10: No), the process returns to step S2.

[0061] Next, the procedure of this embodiment will be described.

[0062] Each configuration included in the computing device 1 can be realized by hardware, software, or a combination thereof. Here, realization by software means realization by causing a computer to read and execute a program.

[0063] Various types of non-transitory computer readable media can be used to store the program and provide the program to the computer. Non-transitory computer readable media include various types of tangible recording media (tangible storage medium). Examples of non-transitory computer readable media include magnetic recording media (such as floppy disks, magnetic tapes, hard disk drives), magneto-optical recording media (such as magneto-optical disks), CD-ROM (Read Only Memory), CD-R, CD-R / W, semiconductor memory (such as mask ROM, PROM (Programmable ROM: Programmable Read Only Memory), EPROM (Erasable PROM: Erasable Programmable Read Only Memory), Flash ROM, RAM (random access memory)). In addition, the display program can also be provided to the computer by various types of transient computer readable media (transitory computer readable medium). Examples of transient computer readable media include electrical signals, optical signals, and electromagnetic waves. Transient computer readable media can provide the program to the computer via a wired communication path such as wires and optical fibers or a wireless communication path.

[0064] As described above, according to the computing device 1 and the program according to one embodiment, the following effects are achieved.

[0065] (1) A computing device 1 for computing a ratio of heat applied to a molding material in an injection molding machine 10, the injection molding machine 10 comprising a barrel 101, a heater 102 disposed around the barrel 101, and a screw disposed inside the barrel 101, the computing device 1 comprising: a temperature acquisition unit 11 for acquiring the temperature of the molding material before heating and the temperature of the molding material injected from the barrel 101 as temperature information; an operation information acquisition unit 13 for acquiring the operation states of a motor and the heater 102 for operating the screw as operation information; a characteristic information acquisition unit 15 for acquiring the characteristics of the molding material and the injection molding machine 10 as characteristic information; a computing unit 16 for computing the energy change amount of the molding material, the shear heat 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 computing the ratio of the shear heat to the heater heat transfer amount; and an output unit 17 for outputting the computation result. Thus, the relationship between heat transfer and shear heat can be easily obtained as an index of molding conditions.

[0066] (2) The calculation unit 16 calculates the energy change amount of the molding material based on the acquired temperature information, motion information, and characteristic information. This makes it possible to easily obtain the energy efficiency for the molding material.

[0067] (3) The calculation unit 16 calculates the ratio of the shear heat amount to the heater heat transfer amount, and the output unit 17 outputs the calculated ratio. This allows the relationship between heat transfer and shear heat to be obtained as an index of molding conditions in a more easily understandable value.

[0068] (4) The calculation unit 16 calculates at least one of the ratio of the sum of the heater calorific value and the shear heat amount to the energy change amount and the ratio of the heater calorific value to the heater heat transfer amount, and the output unit 17 outputs the calculated ratio. In this way, more detailed information on the index of the molding conditions can be easily obtained.

[0069] (5) The temperature acquisition unit 11 acquires, as temperature information, a temperature obtained by averaging the measured values ​​of the molding material injected from the cylinder 101 within a predetermined time. This makes it possible to obtain the temperature of the molding material with high accuracy.

[0070] (6) The calculation unit 16 calculates the ratio using the temperature of the molding material before heating and during injection, which is obtained at intervals of the time from when the molding material is put into the barrel 101 to when the molding material moves to the injection port of the barrel 101, as temperature information. Thus, focusing on the molding material put in from the injection port, the temperature change of the molding material injected after moving in the barrel 101 can be obtained as temperature information, so that the energy change amount can be calculated with high accuracy.

[0071] (7) The calculation unit 16 calculates the amount of shear heat using the time it takes for the shear torque to be transmitted from the screw to the molding material. This makes it possible to calculate the amount of shear heat with high accuracy.

[0072] (8) The calculation unit 16 calculates the heater heat amount using the heat transfer time from the heater 102 to the molding material. This makes it possible to calculate the heater heat amount with high accuracy.

[0073] (9) Metering and injection are considered as one cycle, and the calculation unit 16 calculates the energy change of the molding material, the shear heat of the screw, and the heater heat transfer from the heater for each cycle. In this way, the index of the molding condition can be calculated for each cycle, so the subsequent molding conditions can be verified more effectively.

[0074] (10) The output unit 17 outputs the calculation result of the calculation unit 16 in the form of a scatter diagram for each predetermined interval. In this way, the calculation result of the calculation unit 16 can be output in a more understandable form.

[0075] (11) The computing device 1 further includes a molding condition acquisition unit 12, which acquires molding conditions set for the injection molding machine 10, and an output unit 17 which arranges and outputs the calculation results of the computing unit 16 in a time series, and outputs a cursor that can select the arranged calculation results along the time series and a molding condition corresponding to the calculation result selected by the cursor. In this way, the calculation results of the computing unit 16 can be output in a more understandable manner.

[0076] (12) The calculation device 1 further includes a comparison unit 18 that compares the molding conditions selected by the plurality of cursors, and the output unit 17 outputs the molding conditions that differ between the plurality of cursors. Thus, the calculation result of the calculation unit 16 can be output in a more understandable form.

[0077] As mentioned above, although each preferred embodiment of the computing device and the program of this disclosure was described, this disclosure is not limited to the above-mentioned embodiment, and appropriate changes can be made.

[0078] For example, in the above embodiment, the calculation unit 16 may calculate at least one of the ratio of the sum of the heater calorific value and the shear heat amount to the energy change amount and the ratio of the heater calorific value to the heater heat transfer amount.

[0079] In addition, in the above embodiment, the temperature acquisition unit 11 may also acquire the measured temperature of the control temperature sensor used to control the temperature of the material inlet of the molding machine. In addition, the temperature acquisition unit 11 may also acquire the temperature (constant) input to the molding machine as the set temperature of the material inlet. In addition, the temperature acquisition unit 11 may also acquire any temperature (constant) input by the user. Thus, there is no need to add a sensor for measuring the temperature of the resin, so that low cost can be achieved.

[0080] In addition, in the above embodiment, the temperature acquisition unit 11 may also acquire the measured temperature of the control temperature sensor used by the molding machine to control the temperature of the front end of the heating barrel 101. In addition, the temperature acquisition unit 11 may also acquire the temperature (constant) input to the molding machine as the set temperature of the front end of the heating barrel 101. In addition, the temperature acquisition unit 11 may also acquire any temperature (constant) input by the user. Thus, there is no need to add a sensor for measuring the temperature of the resin, so that it is possible to achieve low cost, remove the limitation of the sensor strength on the molding conditions, and avoid the reduction of the barrel strength.

[0081] In addition, in the above embodiment, the mass m of the molding material may be the mass of the molded product measured by the user. Thus, although the time and effort of the measurement increase, the mass of the measured resin can be accurately measured. The mass of the molded product in injection molding varies very little, so it may be set to a fixed value.

[0082] In addition, in the above-mentioned embodiment, the calculation unit 16 may calculate the energy change amount of the molding material, the shear heat amount of the screw, the heater heat transfer amount from the heater 102, the ratio of the shear heat amount to the heater heat transfer amount, the ratio of the sum of the heater heat amount and the shear heat amount to the energy change amount, and the ratio of the heater heat amount to the heater heat transfer amount for a plurality of cycles of the injection molding machine 10 at once, without being limited to one cycle of the injection molding machine 10. Thus, by calculating the amount of a plurality of cycles at once, the calculation result can be stabilized. For example, when comparing the ratios under different molding conditions, it is desirable to compare the values ​​of the amount of a plurality of cycles.

[0083] In addition, in the above-mentioned embodiment, the temperature acquisition unit 11 may acquire the temperature of any one of the injection nozzle (not shown), the nozzle adapter (not shown) and the front end of the barrel 101 of the injection molding machine 10. In which of the nozzle, the nozzle adapter and the barrel there is the most resin to be injected changes according to the barrel volume and the injection volume. Therefore, by using the temperature of the appropriate component accordingly, the calculation accuracy can be improved.

[0084] In addition, in the above embodiment, the temperature acquisition unit 11 may also use a plurality of sensors to acquire the temperature of the injected molding material and the temperature of the inlet. The temperature acquisition unit 11 may also use only the value of a specific sensor among the plurality of sensors. In addition, the temperature acquisition unit 11 may also use the average value of the plurality of sensors. By acquiring data from a plurality of sensors, the energy change amount can be calculated with higher accuracy.

[0085] In addition, the temperature acquisition unit 11 may directly measure the temperature of the material. By directly measuring the temperature of the material, the accuracy can be improved. In addition, the temperature acquisition unit 11 may also acquire the temperature inside the wall. Thus, the temperature can be measured without considering the strength of the sensor.

[0086] In addition, when a plurality of control point temperatures such as the nozzle, the nozzle adapter, and the heating cylinder 101 can be used, the temperature acquisition unit 11 may acquire only the temperature of a specific control point or an average value. In addition, when a plurality of set temperatures can be used, the temperature acquisition unit 11 may acquire only a specific set temperature or an average value. In the case where the measured resin is uniformly present in each component, the accuracy can be improved by using the average value of the control point temperature and the set temperature.

[0087] In addition, in the above-mentioned embodiment, the proportional operation unit 165 may also fractionalize the operation result. The output unit 17 may output the fractionalized result. The proportional operation unit 165 may, for example, fractionalize the ratio of heat transfer to shear or the energy efficiency. The proportional operation unit 165 may, for example, fractionalize the appropriateness of the ratio of heat transfer to shear for a pre-set target value of quality emphasis or molding efficiency emphasis. In addition, the proportional operation unit 165 may also fractionalize the appropriateness of the energy efficiency in the actual operation for the energy efficiency pre-set as the target value.

[0088] Description of Reference Numerals

[0089] 1: computing device; 10: injection molding machine; 11: temperature acquisition unit; 12: molding condition acquisition unit; 13: action information acquisition unit; 14: characteristic information acquisition unit; 16: computing unit; 17: output unit; 101: barrel; 102: heater.

Claims

1. A computing device for computing a ratio of heat applied to a molding material in an injection molding machine, the injection molding machine comprising a barrel, a heater disposed around the barrel, and a screw disposed inside the barrel, the computing device comprising: a temperature acquisition unit that acquires the temperature of the molding material before heating and the temperature of the molding material injected from the barrel as temperature information; an operation information acquisition unit that acquires operation states of the motor for operating the screw and the heater as operation information; 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 amount from the heater based on the acquired temperature information, the motion information, and the characteristic information; and The output unit outputs the calculation result.

2. The computing device according to claim 1, wherein: The calculation unit calculates an amount of energy change of the molding material based on the acquired temperature information, the motion information, and the characteristic information.

3. The computing device according to claim 1, wherein: The calculation unit calculates the ratio of the shear heat to the heat transfer of the heater. The output unit outputs the calculated ratio.

4. The computing device according to claim 2, wherein: The calculation unit calculates at least one of a ratio of a sum of a heater heat amount generated by the heater and the shear heat amount to the energy change amount and a ratio of the heater heat amount to the heater heat transfer amount. The output unit outputs the calculated ratio.

5. The computing 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 within a predetermined time.

6. The computing device according to claim 1, wherein: The calculation unit calculates a ratio using the temperature of the molding material before heating and the temperature of the molding material during injection, which are acquired at the following intervals, as temperature information: the time from the moment the molding material is put into the barrel to the moment the molding material moves to the injection port of the barrel.

7. The computing device according to claim 1, wherein: The calculation unit calculates the shear heat amount using a transmission time of the shear torque from the screw to the molding material.

8. The computing device according to claim 4, wherein: The calculation unit calculates the amount of heat generated by the heater using a heat transfer time from the heater to the molding material.

9. The computing device according to claim 2, wherein: The calculation unit calculates the energy change amount of the molding material, the shear heat amount of the screw, and the heater heat amount from the heater for each molding cycle.

10. The computing device according to claim 1, wherein: The output unit outputs the calculation result of the calculation unit in the form of a scatter diagram for each predetermined interval.

11. The computing device according to claim 1, wherein: The method further comprises a molding condition acquisition unit for acquiring molding conditions set for the injection molding machine. The output unit arranges and outputs the calculation results of the calculation unit in time series, and outputs a cursor that can select the arranged calculation results along the time series and a molding condition corresponding to the calculation result selected by the cursor.

12. The computing device according to claim 11, wherein: A comparing unit is further provided, the comparing unit comparing the molding conditions selected by the plurality of cursors, The output section outputs molding conditions that differ between the plurality of cursors.

13. A program for causing a computer to operate as a computing device for computing the ratio of heat applied to a molding material in an injection molding machine, wherein: The injection molding machine includes a barrel, a heater disposed around the barrel, and a screw disposed inside the barrel. The program causes the computer to function as: a temperature acquisition unit that acquires the temperature of the molding material before heating and the temperature of the molding material injected from the barrel as temperature information; an operation information acquisition unit that acquires operation states of the motor for operating the screw and the heater as operation information; 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 amount from the heater based on the acquired temperature information, the motion information, and the characteristic information; as well as The output unit outputs the calculation result.

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