Injection molding machine screen display

Abstract

This invention provides a screen display device for an injection molding machine that allows for consideration of reducing power consumption during the molding cycle. [Solution] The solution concerns the screen display device (4, 4a) of an injection molding machine (1). The screen display device (4, 4a) is equipped with a display screen (95') that displays power-related physical quantities. Power-related physical quantities are process-specific physical quantity summaries obtained by aggregating the physical quantities related to the power consumed in each process that constitutes the molding cycle after each process. Servo motor power consumption is one of the process-specific physical quantity summaries and consists of work and switching loss power. These are displayed on the display screen.

Description

Technical Field

[0001] The present invention relates to a screen display device configured to display various display screens on an injection molding machine.

Background Art

[0002] An injection molding machine is composed of various devices, which are driven by servo motors. The injection molding machine is provided with a converter and an inverter. The three-phase AC power supplied from the factory is converted into DC power by the converter. Then, the DC power is converted into three-phase AC current with a desired frequency and a desired current by the inverter and supplied to the servo motor. Thereby, various devices constituting the injection molding machine are driven. Thus, power is consumed in the servo motor of the injection molding machine. Further, a heater is provided in the injection device of the injection molding machine, and power is also consumed in the heater.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

[0004] Patent Document 1 proposes a power consumption display device that detects the power consumption in one cycle of repetition in a machine such as an injection molding machine that performs a repetitive operation and displays and prints this power consumption. According to this document, the power consumption is detected for each element that consumes power, such as a servo motor and a heater, that is, each power consumption element, and this is displayed.

Summary of the Invention

Problems to be Solved by the Invention

[0005] The method described in Patent Document 1 can detect and display power consumption for each power-consuming element, or display the total power consumption. However, even if this is applied to an injection molding machine, sufficient information that can lead to a reduction in power consumption in the injection molding machine cannot be obtained. This is because the molding cycle in an injection molding machine consists of multiple processes, and without knowing the power consumption in each of these processes, it is impossible to obtain hints for reducing power consumption.

[0006] This disclosure provides a screen display device for an injection molding machine that can be used to reduce power consumption during the molding cycle.

[0007] Other challenges and novel features will become apparent from the description and accompanying drawings in this specification. [Means for solving the problem]

[0008] This disclosure pertains to a screen display device for an injection molding machine. The screen display device includes a display screen that shows power-related physical quantities. Power-related physical quantities are physical quantities related to the power consumed in each process that constitutes the molding cycle. Process-specific physical quantity aggregate values ​​obtained by aggregating the data for each process. That is the case. The process-specific physical quantity summary includes process-specific power consumption, which is the amount of power consumed by the injection molding machine in each process, and the process-specific power consumption includes servo motor power consumption, which is the amount of power consumed by the servo motors operated in each process. The servo motor power consumption consists of the amount of work given to the material by the servo motor's drive and the amount of power due to switching losses in the servo motor, and the amount of work and the amount of power due to switching losses are displayed separately on the display screen for each servo motor. [Effects of the Invention]

[0009] This disclosure makes it easy to consider reducing power consumption in the molding cycle. [Brief explanation of the drawing]

[0010] [Figure 1] This is a front view showing an injection molding machine according to the first embodiment. [Figure 2] This is a power supply system diagram for a servo motor in an injection molding machine according to the first embodiment. [Figure 3] This is a block diagram showing various processes performed in the control device of an injection molding machine according to the first embodiment. [Figure 4]This is a power-related physical quantity display screen shown on the screen display device of an injection molding machine according to the first embodiment. [Figure 5] This is a sub-window of the power-related physical quantity display screen according to the first embodiment. [Figure 6A] This is an element screen displayed on the power-related physical quantity display screen according to the first embodiment, and is a screen that displays the power consumption by process in a graph. [Figure 6B] This is a modified example of the element screen displayed on the power-related physical quantity display screen according to the first embodiment, and is a screen that displays the power consumption amount for each process as numerical data. [Figure 6C] This is a modified example of the element screen displayed on the power-related physical quantity display screen according to the first embodiment, and is a screen that displays power consumption by process in graph form and as numerical data. [Figure 6D] This is a modified example of the element screen displayed on the power-related physical quantity display screen according to the first embodiment, and is an element screen that displays the execution time for each process in a graph. [Figure 6E] This is a modified example of the element screen displayed on the power-related physical quantity display screen according to the first embodiment, and is an element screen that shows the molding cycle power consumption as a bar graph. [Figure 6F] This is a modified example of the element screen displayed on the power-related physical quantity display screen according to the first embodiment, and is an element screen that numerically displays the servo motor power quantity. [Figure 6G] This is a modified example of the element screen displayed on the power-related physical quantity display screen according to the first embodiment, and is an element screen that numerically displays the servo motor power quantity. [Figure 6H] This is a modified example of the element screen displayed on the power-related physical quantity display screen according to the first embodiment, and is an element screen that displays the power consumption of a servo motor in a graph. [Figure 7] This graph shows the switching losses that occur in a servo amplifier. [Figure 8] This is a power-related physical quantity display screen shown on the screen display device of an injection molding machine according to the second embodiment. [Figure 9A]It is an element screen displayed on the power-related physical quantity display screen according to the second embodiment, and is a screen for graphically displaying the power consumption amount by process. [Figure 9B] It is a modified example of the element screen displayed on the power-related physical quantity display screen according to the second embodiment, and is an element screen for displaying numerical data of the power consumption amount by process. [Figure 9C] It is a modified example of the element screen displayed on the power-related physical quantity display screen according to the second embodiment, and is an element screen for graphically displaying the implementation time by process. [Figure 9D] It is a modified example of the element screen displayed on the power-related physical quantity display screen according to the second embodiment, and is an element screen for showing the power consumption amount of the molding cycle in a bar graph. [Figure 9E] It is a modified example of the element screen displayed on the power-related physical quantity display screen according to the second embodiment, and is an element screen for numerically displaying the servo motor power amount. [Figure 9F] It is a modified example of the element screen displayed on the power-related physical quantity display screen according to the second embodiment, and is an element screen for numerically displaying the servo motor power amount. [Figure 9G] [[ID=##]]It is a modified example of the element screen displayed on the power-related physical quantity display screen according to the second embodiment, and is an element screen for graphically displaying the servo motor power consumption. [Figure 10] It is a power-related physical quantity display screen displayed on the screen display device of the injection molding machine according to the third embodiment. [Figure 11A] It is a molding condition change support screen displayed on the power-related physical quantity display screen according to the third embodiment, and is a molding condition consideration support screen. [Figure 11B] It is a modified example of the molding condition change support screen displayed on the power-related physical quantity display screen according to the third embodiment, and is a molding condition change item display screen. [Figure 12] It is a power-related physical quantity display screen according to the modified example.

Modes for Carrying Out the Invention

[0011] The following describes specific embodiments in detail with reference to the drawings. However, the embodiments are not limited to those described below. For clarity, the following descriptions and drawings have been simplified as appropriate. In each drawing, the same elements are denoted by the same reference numerals, and redundant explanations have been omitted where necessary. Also, hatching has been omitted in some parts of the drawings to avoid clutter.

[0012] [First Embodiment] <Injection molding machine> The injection molding machine 1 according to the first embodiment, as shown in Figure 1, includes a mold clamping device 2, an injection device 3, an ejection device (EJ device) 5, etc. The injection molding machine 1 is equipped with a controller, or control device 4, and the mold clamping device 2, injection device 3, EJ device 5, etc. are controlled by the control device 4. The control device 4 is provided with a monitor 4a on which various screens are displayed. In other words, the control device 4 and the monitor 4a constitute a screen display device in the injection molding machine 1.

[0013] <Mold clamping device> The mold clamping device 2 comprises a fixed platen 7 fixed to the bed B, a movable platen 8 slidably mounted on the bed B, and a mold clamping housing 9. The fixed platen 7 and the mold clamping housing 9 are connected by a plurality of tie bars 11, 11, ..., and the movable platen 8 is slidably mounted between the fixed platen 7 and the mold clamping housing 9. A mold clamping mechanism, specifically a toggle mechanism 13 in this embodiment, is provided between the mold clamping housing 9 and the movable platen 8. The fixed platen 7 and the movable platen 8 are each provided with a fixed mold 15 and a movable mold 16. Therefore, when the toggle mechanism 13 is driven, the molds 15 and 16 are opened and closed. The EJ device 5 for ejecting the molded product is provided on the movable platen 8.

[0014] <Injection device> The injection device 3 comprises a heating cylinder 19, a screw 20 located inside the heating cylinder 19, and a screw drive device 22. The heating cylinder 19 is supported by the screw drive device 22, and the screw 20 is driven by the screw drive device 22 in both the rotational and axial directions. The heating cylinder 19 is provided with a hopper 23 and an injection nozzle 24. The heating cylinder 19 is provided with a plurality of heaters 25, 25, ...

[0015] The injection device 3 is advanced so that the injection nozzle 24 touches the fixed mold 15. Power is supplied to the heaters 25, 25, ... by command from the control device 4 to heat the heating cylinder 19, and the injection material is supplied from the hopper 23 to rotate the screw 20. As a result, the injection material melts and is sent to the tip of the screw 20, that is, it is metered. Once the injection material has been metered, the screw drive device 22 is controlled by command from the control device 4 to drive the screw 20 in the axial direction. As a result, the injection material is pushed forward as the screw 20 moves forward, that is, the injection material is injected into the molds 15 and 16.

[0016] <Power supply system> The injection molding machine 1 according to the first embodiment is driven by a servo motor. The power supply system will now be described. The injection molding machine 1 according to the first embodiment is provided with a converter 30, as shown in Figure 2. The converter 30 is connected to the factory's three-phase AC power supply 31 and also to a DC voltage line 33 provided inside the injection molding machine 1. Multiple inverters, i.e., servo amplifiers 35, 36, 37, 38, ... are connected to the DC voltage line 33. Each of the servo amplifiers 35, 36, 37, 38, ... is provided with a servo motor 41, 42, 43, 44, ... namely the injection shaft servo motor 41, the plasticizing shaft servo motor 42, the mold opening / closing shaft servo motor 43, the EJ shaft servo motor 44, ...

[0017] Three-phase AC power from the three-phase AC power supply 31 is converted to DC power by the converter 30 and supplied to the DC voltage line 33. The DC power is then converted to three-phase AC power of the desired frequency and current by servo amplifiers 35, 36, 37, 38, ... and supplied to each of the servo motors 41, 42, ... This drives the servo motors 41, 42, 43, 44, ... In addition, regenerative power is recovered from the servo motors 41, 42, 43, 44, ... and converted to DC power by the servo amplifiers 35, 36, 37, 38, ... In this embodiment, the converter 30 is a PWM converter, so the regenerative power can be returned to the three-phase AC power supply 31.

[0018] Each of these servo amplifiers 35, 36, 37, 38, ... is equipped with a current sensor 46, 47, 48, 49, ... to measure the current supplied to the servo motors 41, 42, 43, 44, .... Each servo motor 41, 42, 43, 44, ... is also equipped with a rotary encoder 51, 52, 53, 54, ... to detect the rotational speed of the servo motors 41, 42, 43, 44, .... The current and rotational speed are sent to the control device 4 (see Figure 1).

[0019] <Control device> The control device 4, equipped with monitor 4a, is a screen display device as described above, and has a screen that displays various physical quantities related to power consumption, i.e., power-related physical quantities, as will be explained in detail later. The control device 4 is equipped with various programs, i.e., various processes, for measuring and aggregating power-related physical quantities, as shown in Figure 3. These include a power calculation unit 60, a process-specific power consumption calculation unit 61, and an implementation time measurement unit 62.

[0020] The power calculation unit 60 individually calculates the power consumed in the injection molding machine 1, such as the power consumed by each servo motor 41, 42, 43, 44, ... and the power consumed by the heaters 25, 25, ... Specifically, for the servo motors 41, 42, 43, 44, ..., the power consumed by each is calculated from the current measured by the current sensors 46, 47, 48, 49, ... and the rotational speed detected by the rotary encoders 51, 52, 53, 54, ... For example, power can be calculated as the work rate of the servo motors 41, 42, 43, 44, ... Power = 2 * π * Torque * Rotational Speed ​​ / 60 It is calculated by [method]. Torque can be calculated from the current.

[0021] Then, as will be explained later, the power of the switching losses generated by the switching in the servo amplifiers 35, 36, 37, 38, ... is calculated. For the heaters 25, 25, ..., the power consumption is calculated from the supplied current and voltage. These calculated individual power values ​​are sequentially saved in the power-related physical quantity history file 65 for each molding cycle.

[0022] The process-specific power consumption calculation unit 61 takes the power consumption of each servo motor 41, 42, 43, 44, ... and the power consumption of heaters 25, 25, ... calculated by the power calculation unit 60 as input and calculates the process-specific power consumption from these. The molding cycle consists of multiple processes such as the mold closing process, injection process, holding pressure process, and metering process, but the power consumption for each process is aggregated, i.e., integrated, to obtain the total power consumption. This is the process-specific power consumption. The process-specific power consumption calculation unit 61 calculates the process-specific power consumption for each servo motor 41, 42, 43, 44, ... and for each heater 25, 25, ... and saves it in the power-related physical quantity history file 65. Note that the process-specific power consumption is an aggregate value of power, which is a physical quantity related to power consumption, aggregated in each process that constitutes the molding cycle. In this specification, such aggregate values ​​will be called process-specific physical quantity aggregate values.

[0023] The execution time measurement unit 62 measures the execution time for each process that constitutes the molding cycle. That is, it measures the time from the start to the end of the mold closing process, the time from the start to the end of the injection process, etc. The execution time for each of these processes is stored in the power-related physical quantity history file 65. The execution time for each process is closely related to the power consumption for each process. For example, in the metering process, the longer the execution time of the metering process, the more power is consumed to drive the screw. Therefore, the execution time for each process can be said to be an aggregate value for each process regarding physical quantities related to power consumption. In other words, the execution time for each process is also an aggregate value of physical quantities for each process. Note that aggregate values ​​of physical quantities for each process, such as power consumption for each process and execution time for each process, as well as power consumption as an instantaneous value, are all included in power-related physical quantities.

[0024] The power-related physical quantity history file 65 stores various power values ​​calculated by the power calculation unit 60, process-specific power consumption calculated by the process-specific power consumption calculation unit 61, and process-specific execution times measured by the execution time measurement unit 62. However, the amount of data to be stored can be freely set. For example, since various power values ​​need to be stored as instantaneous values, they consume a relatively large amount of data area. Therefore, it is possible to store only the data for several molding cycles. On the other hand, process-specific power consumption and process-specific execution times are stored as aggregated or cumulative values, so they consume relatively little data area. Therefore, it is possible to store data for several months' worth of molding cycles. Alternatively, data can be stored for a certain number of molding cycles regardless of the type of data. In any case, the amount of data to be stored can be freely set.

[0025] <Power-related physical quantity display screen> The injection molding machine 1 according to the first embodiment is characterized by displaying power-related physical quantities on a screen for each process that constitutes the molding cycle. By checking the power-related physical quantities in each process of the molding cycle, the operator can consider reviewing the molding conditions to reduce the amount of electricity consumed. A power-related physical quantity display screen 70, which displays such power-related physical quantities, is shown in Figure 4.

[0026] The power-related physical quantity display screen 70 is provided with a comparison target molding cycle selection button 77 and an element screen display area 71. The element screen display area 71 displays the element screen 80 of process-specific power consumption, which will be explained later, as shown in Figure 6A. As will be explained later, the process-specific power consumption element screen 80 displays not only the process-specific power consumption in the latest molding cycle, but also the process-specific power consumption in a specific molding cycle for comparison. In this specification, the power-related physical quantity in the latest molding cycle is called the latest power-related physical quantity, and the power-related physical quantity in a specific molding cycle for comparison is called the comparison target power-related physical quantity. Therefore, the process-specific power consumption in the latest molding cycle is included in the latest power-related physical quantity, and the process-specific power consumption in a specific molding cycle for comparison is included in the comparison target power-related physical quantity.

[0027] Clicking the "Select Comparison Molding Cycle" button 77 on the power-related physical quantity display screen 70 displays the "Select Comparison Molding Cycle" sub-window 78 shown in Figure 5. Here, you select a specific molding cycle to be used for comparison. You can choose to use the previous molding cycle or specify a date and time to use the molding cycle at a specific time. Figure 5 shows the previous molding cycle selected as the specific cycle to be used for comparison.

[0028] <Element Screen - Power Consumption by Process (Graph)> In the first embodiment, the element screen display area 71 of the power-related physical quantity display screen 70 (see Figure 4) displays the element screen 80 of power consumption by process, as shown in Figure 6A. The element screen 80 of power consumption by process displays the power consumption by process for each process that constitutes the molding cycle as a bar graph. For each process, two bar graphs are displayed side by side, one above the other, as indicated by the symbols 81, 82, 81, 82, ... The upper graphs 81, 81, ... show the power consumption by process in the latest molding cycle, and the lower graphs 82, 82, ... show the power consumption by process in a comparison molding cycle. In other words, the latest power-related physical quantity and the power-related physical quantity for comparison are shown.

[0029] By comparing the latest power-related physical quantities with those from a specific past molding cycle for comparison, operators can gain insights into reducing power consumption. Note that the power consumption per process displayed graphically on this element screen could also be limited to the power consumption of servo motors 41, 42, 43, 44, ... (see Figure 2), i.e., only the servo motor power consumption. However, in this embodiment, the power consumption per process displayed is the sum of the servo motor power consumption and the power consumption of heaters 25, 25, ... (see Figure 1).

[0030] <Modification Example 1 of the First Embodiment: Element Screen - Power Consumption by Process (Numerical Value)> In the first embodiment, the element screen 80' for power consumption by process can be transformed into a numerical data display as shown in Figure 6B. Since the amount of power consumed in each process is displayed as numerical data, the power consumption can be accurately grasped. Note that the element screen 80' for power consumption by process according to Modification 1 is displayed in the injection molding machine 1 according to the first embodiment described in Figures 1 to 5, so the description of the injection molding machine 1 will be omitted.

[0031] <Modified Example 2 of the First Embodiment: Element Screen - Power Consumption by Process (Graph, Numerical Values)> In the first embodiment, the element screen 80 for power consumption by process can also be modified as shown in Figure 6C. In the element screen 80'' for power consumption by process according to Modification 2 shown in Figure 6C, the power consumption is displayed as numerical data, indicated by reference numerals 125, 125, behind the bar graphs 81, 82, 81, 82, ... In other words, both a graph and numerical data are displayed. The graph allows for an intuitive understanding of the power consumption, and the numerical data allows for accurate determination of the power consumption.

[0032] <Modified Example of the First Embodiment: Element Screen - Execution Time by Process> In the first embodiment, the element screen displayed in the element screen display area 71 of the power-related physical quantity display screen 70 (see Figure 4) can be modified. Figure 6D shows an element screen 85 of process execution time displayed as Modification 3. Since Modification 3 is also displayed on the power-related physical quantity display screen 70 of the injection molding machine 1 according to the first embodiment described in Figures 1 to 5, the explanation of the injection molding machine 1 will be omitted.

[0033] The element screen 85 for process execution time shows the execution time for each process that makes up the molding cycle as a bar graph. For each process, the bar graph is shown as two superimposed bars of different thicknesses, indicated by symbols 86, 87, 86, 87, ... The thin graphs 86, 86, ... represent the process execution time in the most recent molding cycle, while the thick graphs 87, 87, ... represent the process execution time in a comparison molding cycle. In other words, they represent the latest power-related physical quantity and the power-related physical quantity of the comparison.

[0034] <Modification of the First Embodiment: Element Screen - Molding Cycle Power Consumption> Figure 6E shows a modified example 4, which is an element screen 89 of the molding cycle power consumption displayed on the power-related physical quantity display screen 70 (see Figure 4). Since the element screen 89 of the molding cycle power consumption is also displayed on the power-related physical quantity display screen 70 of the injection molding machine 1 according to the first embodiment described in Figures 1 to 5, the explanation of the injection molding machine 1 will be omitted. The element screen 89 of the molding cycle power consumption displays a bar graph showing the sum of the power consumption for each process constituting the molding cycle. This allows for a quick overview of the total power consumption for the entire molding cycle, providing hints for reviewing molding conditions to reduce power consumption. The graph on the left shows the molding cycle power consumption in a comparison molding cycle, and the graph on the right shows the molding cycle power consumption in the most recent molding cycle. In other words, it shows the power-related physical quantity for comparison and the power-related physical quantity for the most recent cycle.

[0035] These bar graphs of molding cycle power consumption include regenerated energy 91 and regenerated energy 92. Regenerated energy 91 is the amount of energy recovered from servo amplifiers 35, 36, 37, 38, ... (see Figure 2). The regenerated energy P is the d-axis current I obtained by dq-converting the current flowing through servo amplifiers 35, 36, 37, 38, ... d It can be calculated when it is a negative value. That is, the d-axis current I d The effective phase voltage V and the power factor in the converter 30 (see Figure 2) are used to calculate the following equation, for example, when the power factor is 1. P = √3 × V × I d

[0036] Renewable energy 92 is the amount of electricity supplied to the factory where the injection molding machine 1 (see Figure 1) is installed, and includes electricity from wind power, geothermal power, solar power, etc. Renewable energy 92 is manually entered by the operator in the control device 4 (see Figure 1) and is displayed as reference data. Alternatively, renewable energy 92 may be received via communication from a host computer or the like instead of being manually entered.

[0037] The element screen 89 of the molding cycle power consumption shown in Figure 6E is displayed as a bar graph, so the total power consumption for the entire molding cycle can be easily understood by the overall length of the bar. This can also be displayed using other types of graphs, such as a pie chart. When displayed as a pie chart, the size of the circle can represent the magnitude of the power consumption for the entire molding cycle.

[0038] <Modification of the First Embodiment: Element Screen - Servo Motor Power Consumption> Figure 6F shows a modified example 5, which is an element screen 95 of the servo motor power quantity displayed on the power-related physical quantity display screen 70 (see Figure 4). Since the modified example 5 is also displayed on the power-related physical quantity display screen 70 of the injection molding machine 1 according to the first embodiment described in Figures 1 to 5, a description of the injection molding machine 1 will be omitted. The element screen 95 of the servo motor power quantity displays the power consumption of the servo motors 41 (injection shaft), 42 (plasticizing shaft), 43 (mold opening / closing shaft), 44 (EJ shaft), ... in each process constituting the molding cycle, i.e., the servo motor power quantity, as numerical data. Reference numerals 96, 96, ... indicate the servo motor power quantity in the most recent molding cycle, and reference numerals 97, 97, ... indicate the servo motor power quantity in a comparison molding cycle. In other words, the latest power-related physical quantity and the power-related physical quantity for comparison are shown.

[0039] <Modification of the First Embodiment: Element Screen - Servo Motor Power Consumption> Figure 6G shows the element screen 95' of the servo motor power quantity, which is displayed on the power-related physical quantity display screen 70 (see Figure 4) as Modification 6, a variation of Modification 5. Since Modification 6 is also displayed on the power-related physical quantity display screen 70 of the injection molding machine 1 according to the first embodiment described in Figures 1 to 5, the explanation of the injection molding machine 1 will be omitted. The servo motor power quantity consists of the amount of work done on the components constituting the injection molding machine 1 (see Figure 1) by the rotation of the servo motors 41 (injection shaft), 42 (plasticizing shaft), 43 (mold opening / closing shaft), 44 (EJ shaft), ... (see Figure 2), and the amount of power of the switching loss (SW loss) caused by the switching of the servo amplifiers 35, 36, 37, 38, .... These are each displayed as numerical data.

[0040] If the operator determines that the switching loss is large by looking at the servo motor power consumption element screen 95', they can consider reviewing the molding conditions and shortening the molding cycle. However, if shortening the molding cycle does not reduce the switching loss, it is also possible to request the manufacturer of injection molding machine 1 (see Figure 1) to change the models of servo amplifiers 35, 36, 37, 38, ... This is because the magnitude of the switching loss differs depending on the model of servo amplifiers 35, 36, 37, 38, ... The operator may also determine that the workload is large for a specific servo motor 41 (injection axis), 42 (plasticizing axis), 43 (mold opening / closing axis), 44 (EJ axis), ... by looking at the servo motor power consumption element screen 95'. In that case, the operator can consider molding conditions that reduce the speed of the target servo motor 41, 42, 43, 44, ...

[0041] Furthermore, the power of the switching loss in the servo amplifiers 35, 36, 37, 38, ... can be given as a function of the effective value Im of the current flowing through the servo amplifiers 35, 36, 37, 38, ..., as shown in graph 98 of Figure 7. In modification 4 of the first embodiment, the power of the switching loss is calculated based on graph 98 of Figure 7, and this is integrated to obtain the power of the switching loss.

[0042] <Modified example of the first embodiment: Element screen - Power consumption graph> Figure 6H shows a modified example 7, which is a power consumption element screen 100 displayed on the power-related physical quantity display screen 70 (see Figure 4). Since modified example 7 is also displayed on the power-related physical quantity display screen 70 of the injection molding machine 1 according to the first embodiment described in Figures 1 to 5, the explanation of the injection molding machine 1 will be omitted.

[0043] The power consumption element screen 100 displays the power consumption of each servo motor 41 (injection axis), 42 (plasticizing axis), 43 (mold opening / closing axis), 44 (EJ axis), ... (see Figure 2) in a line graph during the molding cycle. Power consumption is not an aggregate value for the entire process, and therefore not an aggregate value of physical quantities for each process. However, it is a power-related physical quantity and is useful as reference information for the operator. The power consumption of each servo motor 41, 42, 43, 44, ... is shown in the upper row for the comparison molding cycle and in the lower row for the most recent molding cycle. In other words, both the power-related physical quantities for comparison and the power-related physical quantities for the most recent cycle are shown.

[0044] [Second Embodiment] The second embodiment is configured similarly to the injection molding machine 1 of the first embodiment, as described in Figures 1 to 5. The only differences between the second embodiment and the first embodiment are the power-related physical quantity display screen 70A shown in Figure 8 and the element screen displayed on this screen. Therefore, the description of the injection molding machine for the second embodiment will be omitted. Hereafter, the injection molding machine according to the second embodiment will also be described as injection molding machine 1.

[0045] <Power-related physical quantity display screen> The injection molding machine 1 according to the second embodiment is equipped with a power-related physical quantity display screen 70A, shown in Figure 8, which displays power-related physical quantities on the screen. As will be explained below, the power-related physical quantity display screen 70A according to the second embodiment does not display the power-related physical quantity to be compared, and only the latest power-related physical quantity is displayed. Therefore, the comparison target molding cycle selection button 77, which was provided on the power-related physical quantity display screen 70 according to the first embodiment as described in Figure 4, is not provided. The power-related physical quantity display screen 70A according to the second embodiment shown in Figure 8 is allocated only to the element screen display area 71.

[0046] <Element Screen - Power Consumption by Process (Graph)> In the second embodiment, the element screen display area 71 of the power-related physical quantity display screen 70A displays the element screen 80A for process-specific power consumption shown in Figure 9A. The element screen 80A for process-specific power consumption displays the process-specific power consumption for each process constituting the molding cycle as a bar graph. The process-specific power consumption is shown only for the most recent molding cycle, i.e., the most recent power-related physical quantity. As explained in Figure 6C as a modified example 1 of the first embodiment, the element screen 80A for process-specific power consumption according to the second embodiment shown in Figure 9A may also display the process-specific power consumption as numerical data in parallel with the graph display.

[0047] <Modification Example 1 of the Second Embodiment: Element Screen - Power Consumption by Process (Numerical Value)> In the second embodiment, the element screens displayed in the element screen display area 71 of the power-related physical quantity display screen 70A (see Figure 8) can be modified. Figure 9B shows the element screen 80A' of process-specific power consumption displayed as Modification 1. Element screen 85A' of process-specific execution time Since the amount of electricity consumed in each process is displayed as numerical data, the amount of electricity consumed can be accurately grasped. Furthermore, similar to the element screen 80'' (see Figure 6C) of the power consumption by process described in Modification 2 of the first embodiment, it is also possible to modify the display to show both a graph and numerical data.

[0048] <Modified Example 2 of the Second Embodiment: Element Screen - Execution Time by Process> In the second embodiment, the element screen displayed in the element screen display area 71 of the power-related physical quantity display screen 70A (see Figure 8) can be modified. Figure 9C shows the element screen 85A of process execution time displayed as Modification 2. The process execution time element screen 85A shows the execution time of each process that constitutes the molding cycle as a bar graph. However, the bar graphs indicated by reference numerals 86, 86, ... are the process execution times in the latest molding cycle. In other words, the latest power-related physical quantity is displayed, and the power-related physical quantity to be compared is not displayed.

[0049] <Modification of the second embodiment: Element screen - Power consumption during the molding cycle> Figure 9D shows, as Modification 3, the element screen 89A of the molding cycle power consumption displayed on the power-related physical quantity display screen 70A (see Figure 8). The element screen 89A of the molding cycle power consumption displays a bar graph that sums up the power consumption for each process that constitutes the molding cycle. This allows the power consumption for the entire molding cycle to be checked at a glance. However, the molding cycle power consumption for the most recent molding cycle, i.e., the latest power-related physical quantity, is displayed. This screen also includes regenerative energy 91 and renewable energy 92. These are the same as those described in the element screen 89 of the molding cycle power consumption (see Figure 6E) as Modification 4 of the first embodiment. The explanation is omitted.

[0050] <Modification of the second embodiment: Element screen - Servo motor power consumption> Figure 9E shows, as Modification 4, the element screen 95A of the servo motor power quantity displayed on the power-related physical quantity display screen 70A (see Figure 8). The element screen 95A of the servo motor power quantity displays the power consumption of the servo motors 41 (injection axis), 42 (plasticizing axis), 43 (mold opening / closing axis), 44 (EJ axis), ... (see Figure 2) for each process in the latest molding cycle, i.e., the servo motor power quantity, as numerical data. In other words, the latest power-related physical quantities are shown.

[0051] <Modification of the second embodiment: 5-element screen - servo motor power consumption> Figure 9F shows the element screen 95A' of the servo motor power quantity, which is displayed on the power-related physical quantity display screen 70A (see Figure 8), as Modification 5, which is a variation of Modification 4. The servo motor power quantity consists of the amount of work done on the components constituting the injection molding machine 1 (see Figure 1) by the rotation of the servo motors 41 (injection shaft), 42 (plasticizing shaft), 43 (mold opening / closing shaft), 44 (EJ shaft), ... (see Figure 2), and the amount of power of the switching loss (SW loss) caused by the switching of the servo amplifiers 35, 36, 37, 38, .... These are each displayed as numerical data. These are the power quantities in the latest molding cycle, and the latest power-related physical quantities are shown.

[0052] <Modified example of the second embodiment: Element screen - Power consumption graph> Figure 9G shows a modified example, the power consumption element screen 100A, which is displayed on the power-related physical quantity display screen 70A (see Figure 8). The power consumption element screen 100A displays the power consumption of each servo motor 41 (injection axis), 42 (plasticizing axis), 43 (mold opening / closing axis), 44 (EJ axis), ... (see Figure 2) in the latest molding cycle as a line graph. In other words, the latest power-related physical quantities are shown.

[0053] [Third Embodiment] The third embodiment is configured similarly to the injection molding machine 1 according to the first embodiment, as described in Figures 1 to 5. The only differences between the third embodiment and the first embodiment are the power-related physical quantity display screen 70B shown in Figure 10 and the element screen displayed on this screen. Therefore, the description of the injection molding machine for the third embodiment will be omitted. Hereafter, the injection molding machine according to the third embodiment will also be described as injection molding machine 1.

[0054] <Power-related physical quantity display screen> The injection molding machine 1 according to the third embodiment is equipped with a power-related physical quantity display screen 70B, shown in Figure 10, which displays power-related physical quantities on the screen. The power-related physical quantity display screen 70B is equipped with a comparison target molding cycle selection button 77 and an element screen display area 71, similar to the power-related physical quantity display screen 70 in the first embodiment (see Figure 4). Similar to the first embodiment, the comparison target molding cycle selection button 77 calls up the comparison target molding cycle selection subwindow 78 shown in Figure 5 to select the molding cycle to be compared. In addition, the element screen display area 71 of the power-related physical quantity display screen 70B is equipped with either the element screen 80 of the power consumption per process, as explained in Figure 6A, or the element screens 85, 89, 95, ... relating to the modified examples 1 to 6, as explained in Figures 6C to 6H.

[0055] The power-related physical quantity display screen 70B according to the third embodiment has a different area from that of the first embodiment. Specifically, it is a molding condition change support screen display area 72. This area displays a screen that provides hints for considering molding conditions.

[0056] <Molding Condition Analysis Support Screen> In the third embodiment, the molding condition change support screen display area 72 of the power-related physical quantity display screen 70B displays the molding condition review support screen 107 shown in Figure 11A. The molding condition review support screen 107 displays the setting items for the molding conditions and the process-specific physical quantity aggregate values ​​related to those setting items. The molding condition review support screen 107 is provided with a pull-down menu 108, which is used to select the molding conditions. For example, if "Metering process Screw rotation speed" is selected, the current setting value of the screw rotation speed is shown in reference numeral 118. The process-specific power consumption of the related plasticizing shaft servo motor 42 (see Figure 2) in the metering process is shown in reference numeral 119. The setting value that was set in the comparison molding cycle is shown in reference numeral 121, and the process-specific power consumption at that time is shown in reference numeral 122.

[0057] The operator refers to the element screen 80 (see Figure 6A) of process-specific power consumption displayed in the element screen display area 71 in the power-related physical quantity display screen 70B (see Figure 10) according to the third embodiment. Then, the operator can examine the molding conditions using the molding condition review support screen 107 (see Figure 11A) displayed in the molding condition change support screen display area 72.

[0058] <Modification 1 of the third embodiment: Display screen for changing molding conditions> In the third embodiment, the screen displayed in the molding condition change support screen display area 72 of the power-related physical quantity display screen 70B (see Figure 10) can be modified. Figure 11B shows the molding condition change item display screen 105, which is displayed as Modified Example 1. When the operator changes the molding conditions, the changed molding conditions are displayed in a list. For each molding condition, both the molding conditions before the change and the molding conditions after the change are displayed.

[0059] <Modified versions of the first to third embodiments> The first to third embodiments can be modified in various ways. For example, in the first embodiment, the display of bar graphs 81, 82, 81, 82, ... on the element screen 80 of power consumption by process (see Figure 6A) can be modified. These are arranged vertically, but they may also be displayed overlapping, as shown in graphs 86, 87, ... in Figure 6D. Conversely, in the element screen 85 of the process execution time according to the modified example 2 of the first embodiment described in Figure 6D, graphs 86, 87, 86, 87, ... were described as being displayed overlapping, but they may also be displayed vertically, as shown in graphs 81, 82, 81, 82, ... in Figure 6A.

[0060] Other variations are also possible. For example, in the comparison molding cycle selection subwindow 78, when specifying a particular molding cycle, not only the date but also the time and minute are specified. Alternatively, the time and minute can be omitted, and only the date can be specified. In this case, the molding cycle that was first performed on the specified date can be treated as the comparison molding cycle, and so on.

[0061] The power-related physical quantity display screen 70 according to the first embodiment, as described in Figure 4, can also be modified. Figure 12 shows the modified power-related physical quantity display screen 70'. The power-related physical quantity display screen 70' has two element screen display areas 71a and 71b. Corresponding to these element screen display areas 71a and 71b, element screen selection pull-down menus 74a and 74b are provided. The element screen selection pull-down menus 74a and 74b allow the user to select the element screen to be displayed in the element screen display areas 71a and 71b, respectively. Specifically, the user can select from the element screen 80 for power consumption by process, the element screen 85 for execution time by process, etc., as described in Figures 6A to 6H.

[0062] Since there are two element screen display areas 71a and 71b, different element screens can be displayed simultaneously. However, this power-related physical quantity display screen 70' only has two element screen display areas 71a and 71b, and two element screen selection pull-down menus 74a and 74b. However, it is also possible to provide three or more element screen display areas 71a, 71b, ... and three or more element screen selection pull-down menus 74a, 74b, ...

[0063] The present invention has been described in detail above based on embodiments, but it goes without saying that the present invention is not limited to the embodiments already described, and various modifications are possible without departing from the spirit of the invention. The multiple examples described above can also be implemented in combination as appropriate. [Explanation of symbols]

[0064] 1 Injection molding machine 2 Mold clamping device 3. Injection device 4. Control device 5 EJ device 7 Fixed plate 8 Movable plate 9-type clamping housing 11 tie bars 13 Toggle mechanism 15 Fixed side mold 16 Movable mold 19 Heating cylinder 20 Screw 22 Screw drive mechanism 23 Hopper 24 Injection nozzle 25 Heater 30 Converter 31 Three-phase AC power supply 33 DC voltage lines 35, 36, 37, 38 Servo amplifier 41, 42, 43, 44 Servo motors 46, 47, 48, 49 Current sensors 51, 52, 53, 54 Rotary encoders 60 Power calculation section 61 Process-specific power consumption calculation section 62 Implementation Time Measurement Unit 65 Power-related physical quantity history file 70 Power-related physical quantity display screen 71 Element screen display area 74 Element Screen Selection Dropdown Menu 77. Select comparison molding cycle button 78. Subwindow for selecting the molding cycle to compare 80. Element screen showing power consumption by process. 85. Element screen showing execution time by process. 89. Elements screen of power consumption during the molding cycle 95 Element screen of servo motor power consumption 100 Power Consumption Element Screen 105 Display screen for changing molding conditions 107 Molding Condition Analysis Support Screen B Bed

Claims

1. It is equipped with a display screen that shows power-related physical quantities, The aforementioned power-related physical quantities are aggregated physical quantities for each process, obtained by summing the physical quantities related to the power consumed in each process that constitutes the molding cycle. The aforementioned process-specific physical quantity aggregate includes process-specific power consumption, which is the amount of electricity consumed by the injection molding machine in each process. The aforementioned process-specific power consumption includes the servo motor power consumption, which is the power consumption of the servo motors operated in each process. The servo motor power is composed of the amount of work performed on the member by the drive of the servo motor and the amount of power due to switching losses in the servo motor. A screen display device for an injection molding machine, wherein the amount of work and the amount of power consumption due to switching losses are displayed separately on the display screen for each of the servo motors.

2. The screen display device for an injection molding machine according to claim 1, wherein the display screen shows the latest power-related physical quantity, which is the power-related physical quantity in the most recent molding cycle, and the comparison power-related physical quantity, which is the power-related physical quantity in a specific past molding cycle.

3. The screen display device for an injection molding machine according to claim 1 or 2, wherein the display screen is configured to display the power-related physical quantities in a graph.

4. The screen display device for an injection molding machine according to claim 2, wherein the display screen is configured to show the latest power-related physical quantity and the power-related physical quantity to be compared together for each process and displayed in a graph.

5. The screen display device for an injection molding machine according to claim 1, wherein the display screen displays a bar graph showing the cumulative total of the physical quantity values ​​for each process.

6. The screen display device for an injection molding machine according to claim 5, wherein the bar graph displays the amount of regenerative power recovered in the injection molding machine.

7. The screen display device for an injection molding machine according to claim 6, wherein the bar graph displays the regenerative energy supplied to the injection molding machine.

8. The screen display device for an injection molding machine according to claim 1, wherein the sum of physical quantities for each process includes the execution time of each process.

9. The screen display device for an injection molding machine according to claim 1, wherein the display screen displays the total physical quantity values ​​for each process as numerical data.

10. The screen display device for an injection molding machine according to claim 1, wherein the display screen displays setting data for molding conditions related to the power-related physical quantities.

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