JP2013043336A - Display device and display method of molding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device and a display method of a molding machine in which changing history data of a molding condition become easy to be seen in relation to actually-measured molding data by comparing time of the actually-measured molding data with time of the changing history data of the molding condition.SOLUTION: In the display method of the molding machine 10 for displaying the actually-measured molding data 33, the actually-measured molding data 33 of each molding and a changing history 32 of the molding condition are respectively stored together with the times, the time of the actually-measured molding data 33 is compared with the time of the changing history data 32 of the molding condition to align the actually-measured molding data 33 and the changing history data 32 of the molding condition in chronological order, and the actually-measured molding data 33 aligned in chronological order and the changing history data 32 of the molding condition are displayed on the molding machine 10 or on a display part 18 outside the molding machine 10.

Description

The present invention relates to a display device and a display method for a molding machine.

In molding machines such as injection molding machines, die casting machines, press molding machines, hollow molding machines, and lamination molding machines, molding is performed based on the stored molding conditions, and the molding data measured in each molding is stored in the memory unit. Is remembered. From which molding to which molding, it is possible to determine later which molding conditions were used.

In particular, in Patent Document 1, as described in the paragraph number (0025), “in the setting change display area 11-2, whether or not the molding condition has been changed is indicated in the operation state / abnormality occurrence display area 11-1”. The band graphs are arranged adjacent to each other and along the common time axis, and in particular, the distinction between the molding condition changes is displayed in color, as shown in FIG. These colors are set in advance so as to correspond to the type of molding condition, so the operator can determine what type of molding by looking at the boundary between the color and the adjacent color. It is possible to know when the change of conditions has been made. " In addition, as shown in (0023) and (FIG. 3), “setting change according to time is displayed in the setting change display area 11-2 based on the setting change history data, and abnormality according to time is indicated based on the abnormality occurrence history data. The occurrence is displayed in the operation status / abnormality display area 11-1. The arithmetic processing unit 13 further displays the production achievement rate in the operation status / abnormality display area 11-1 based on the shot number data. It has become.

Therefore, in Patent Document 1, it is possible to know what state the operation status was when an abnormality occurred. However, in Patent Document 1, it is not possible to easily view the change history of only the changed items, which shot condition the item of which molding condition was changed between. Therefore, as to which item the molding condition is changed, it is necessary to print out both molding conditions or display them in parallel on the screen to find out which item is changed among many items. Such an operation has been a time loss and stress for an operator who wants to correct it by quickly returning the molding condition to the original condition.

JP-A-2004-230901 (0023), (0025), (FIG. 3)

Therefore, in the present invention, there is provided a display device and a display method for a molding machine that makes it easy to see the change history data of the molding conditions in relation to the actual measurement molding data by comparing the time of the actual molding data with the time of the change history data of the molding conditions. The purpose is to provide.

The display device of the molding machine according to claim 1 of the present invention is a display device of a molding machine that displays measured molding data, and an actual molding data storage unit that stores the measured molding data of each molding with time,
The molding condition change history data storage unit stores the molding condition change history with time, and the actual molding data and molding condition change history data are compared by comparing the actual molding data time with the molding condition change history data time. A data aligning unit for aligning along the series and a display unit for displaying the measured molding data and the molding condition change history data in association with each other are provided outside the molding machine or the molding machine.

The display device of the molding machine according to claim 2 of the present invention is the abnormality determination unit according to claim 1, wherein the abnormality determination unit determines that the measured value is abnormal when any measured molding data deviates more than a certain value. Compare the measured molding data time determined to the time of the molding condition change history data, and the measured molding data including the measured molding data determined to be an abnormal value and the molding condition change history data in time series And a data alignment unit aligned along the line.

The molding machine display method according to claim 3 of the present invention is the molding machine display method for displaying measured molding data, and stores the measured molding data of each molding with time and molding condition change history with time. Compare the measured molding data time and molding condition change history data time to align the measured molding data and molding condition change history data in chronological order. The information is displayed in association with a display unit outside the molding machine or the molding machine.

The display method of the molding machine according to claim 4 of the present invention is the display method of the molding machine according to claim 3, in which the actual molding data of each molding is displayed as a graph on the display unit, and the actual molding data and molding are displayed on the same display unit as the graph The condition change history data is associated and displayed as a list.

The molding machine display method of the present invention is a molding machine display method for displaying measured molding data. The molding molding measurement data is stored with the time and molding condition change history together with the time, and the molding data time is measured. Compare the molding data and molding condition change history data to align the measured molding data and molding condition change history data in chronological order, and arrange the measured molding data and molding condition change history data aligned in chronological order. Is displayed on the molding machine or a display unit outside the molding machine, so that the change history data of the molding conditions can be easily seen in relation to the measured molding data.

It is a block diagram of the control apparatus in the display apparatus of the injection molding machine of this embodiment. It is the list shown by the display apparatus of the injection molding machine of this embodiment. It is the graph shown by the display apparatus of the injection molding machine of this embodiment. In another embodiment, the control device of the injection molding machine is connected to the control device outside the molding machine.

A display device 11 that displays actual measurement data of an injection molding machine 10 according to an embodiment of the present invention will be described with reference to FIG. An injection molding machine 10 which is a type of molding machine has an injection device 14 and a mold clamping device 15 arranged on a bed 13. Each of the injection device 14 and the mold clamping device 15 includes a driving actuator 16 and a measurement sensor 17. The electric injection molding machine includes an actuator such as a servo motor and sensors such as a rotary encoder, a load cell, and a temperature sensor.In the hydraulic injection molding machine, an actuator including a hydraulic cylinder operated by various valves and a pump; A sensor including a hydraulic sensor, a position sensor, a temperature sensor, and the like is provided. A display unit 18 for setting and displaying is attached to the operation side of the fixed platen of the mold clamping device 15. In the present embodiment, the display unit 18 of the display device 11 includes a touch panel and also serves as the setting unit 19. However, the setting unit 19 may be a numeric keypad or the like provided separately from the display unit 18 or may have a part of the function overlapped with the display unit 18.

Next, the control device 12 and its block diagram in the display device 11 of the present embodiment shown in FIG. 1 will be described. A control device 12 that controls the injection molding machine 10 and controls the display of the display device 11 is disposed below the bed 13. The control device 12 includes a calculation unit 20 and a storage unit 21. In FIG. 1, the control device 12 functionally describes only the part related to the display device 11 of the present invention. However, the control device 12 has many other functions for performing sequence control of the injection molding machine 10 and the like. ing. The control device 12 is connected to the display unit 18 and the setting unit 19. The control device 12 is connected to the actuator 16 and the sensor 17 described above. In the injection molding machine 10, the actuator 16 is actuated by a command signal from the control device 12. Further, a recording medium such as an external memory is connected to either the panel provided with the display unit 18, the control device 12, or the side of the bed 13, or a personal computer 41 outside the molding machine shown in FIG. And a terminal connected to a signal line for communicating with a PLC which is a higher-level control device. In the present invention, communication may be performed wirelessly instead of the signal communication via the signal line via the terminal.

The input unit 22 of the control device 12 is connected to the sensor 17 and the setting unit 19 that measure actual values on the injection molding machine 10 side. The input unit 22 also includes an actual molding data storage unit 23 that stores the actual molding data 33 of each molding in the storage unit 21 with time, and a molding condition change history data that stores molding condition change history data 32 with time. It is connected to the storage unit 24. Therefore, the control device 12 also has a timer function and stores the data recording time (change time). In addition, the measured molding data storage unit 23 is connected to the abnormality determination unit 25 in the calculation unit 20. The abnormality determination unit 25 determines that the measured molding data 33 is an abnormal value when the measured molding data 33 deviates more than a certain value. The change history data storage unit 24 and the abnormality determination unit 25 are connected to the data alignment unit 26. The data alignment unit 26 compares the time of the actually measured molding data 33 and the time of the molding condition change history data 32 and aligns the actually measured molding data and the molding condition change history data in chronological order. The measured molding data storage unit 23, the change history data storage unit 24, and the data alignment unit 26 are also connected to the output unit 27, and are connected to the display unit 18 and the actuator 16 via the output unit 27. The display unit 18 displays the measured molding data 33 and the molding condition change history data 32 in association with each other.

Next, setting of molding conditions and change of molding conditions, storage of molding condition change history data 32, and storage of measured molding data 33 in the display device 11 of the present invention will be described. First, the molding conditions are input from the setting unit 19. The input molding conditions are stored in the storage unit 21 as molding conditions for operating the molding machine. The history in which the molding conditions are set is recorded in the change history data storage unit 24 together with the set time. The molding conditions may be input by connecting an external memory or the like directly or indirectly to the control device 12.

The injection molding machine 10 is molded under the molding conditions. When determining the molding conditions, it is generally performed in the order of manual, semi-automatic, and automatic. However, if the molding conditions are known in advance for a specific mold, the manual or semi-automatic process may be omitted. . During molding by the injection molding machine 10, the actual molding data 33 detected by each sensor 17 is input from the input unit 22 to the storage unit 21 of the control device 12 and stored in the actual molding data storage unit 23. The monitoring items of the molding conditions by the sensors 17 are the injection start position, injection speed, injection pressure, peak injection pressure, filling time, holding pressure switching position, injection completion position, weighing completion position, and heating cylinder on the injection device 14 side. Temperature. Monitored items in the mold clamping device 15 are a mold opening / closing speed, a mold closing position, a mold clamping completion position, a mold clamping force (clamping pressure), and the like. When performing compression molding, a plurality of monitoring items are further set on the mold clamping device side.

In this embodiment, the time of the actual molding data 33 is not the time directly measured by the sensor 17 but the time when the measured molding cycle is completed and the next molding cycle is started is stored in the actual molding data storage unit 23 as a sampling time. Is remembered as Therefore, in one molding cycle (one shot), even when the monitoring items such as the injection speed, the holding pressure switching position, the heating cylinder temperature, and the mold closing completion position are different, each molding cycle (each shot number) It is processed and stored as the time of the same actually measured molding data 33.

And about the case where molding conditions are changed in the middle, the change history is memorized by change history data storage part 24 with time via input part 22, and molding is performed on the molding conditions changed from that time. Therefore, in this embodiment, the molding condition change history data 32 is processed and stored as the molding condition change history time as it is as the modification time (time when the confirmation button is pressed) when the molding condition setting is changed.

The measured molding data 33 of the monitoring items and the molding condition change history data 32 are displayed as a list 31 on the display unit 18 of the display device 11 via the output unit 27 as shown in FIG. The actually measured molding data is also displayed as a graph 28 as shown in FIG. In the present embodiment, the graph 28 and the list 31 are displayed on the screen of the same display unit 18 so that the worker can easily see and work. The graph 28 is drawn with a waveform 29 for each individual item measured by the sensor 17. Then, it can be recognized that the portion of the waveform where the data protrudes is the abnormal value 30. As for the waveform 29 in the graph 28, the waveform 29 of one item (injection filling time in FIG. 3) is usually drawn on one screen, but two or more items may be drawn on the same graph 28. Good.

In the list 31, the actually measured molding data 33 is displayed together with the shot number 34 and the stored time data 35. In the present embodiment, the list 31 displays a plurality of measured molding data 33 of main items, but a single measured molding data 33 or measured molding data 33 selected by the operator may be displayed as a list. As the actual molding data 33, all the actual molding data 33 after the corresponding molding die is attached or the actual molding data 33 of the set shot section is displayed. When setting the shot section, within the time set by the worker (○ hour ○ minute ○ second to ○ hour ○ minute ○ second, or ○ month ○ day) or within the set shot (○ th shot to ○ The actual molding data 33 of the second shot) is displayed on the display unit 18. Further, in the present embodiment, the list 31 displays all the molding condition change history data 32 performed within the corresponding time or shot, together with the display of the measured molding data 33. At this time, the data alignment unit 26 compares the time of the actual molding data 33 (recorded time) with the time of the molding condition change history data 32 (recorded time). The time of the molding condition change history data 32 is aligned along a time series. Then, the molding condition change history data 32 is displayed in association with the measured molding data 33 arranged in chronological order on the list 31 of the display unit 18 via the output unit 27 in an associated manner. (Or, when Excel (registered trademark), which is a spreadsheet software, is used, the time of the latest actually measured molding data 33 and the time of the molding condition change history data 32 may be displayed in the same column.)

Therefore, the operator can easily grasp which setting item of the molding condition is changed and at what timing, not the entire molding condition. Conventionally, it is possible to omit the time during which the entire molding conditions before and after are checked to determine which part has been changed. In the present embodiment, as shown in FIG. 2, the molding condition change history data 32 is displayed outside (for example, the right side) of the part of the actual molding data 33 in the list 31. Specifically, in the molding condition change history data 32 in which the stored time data 36 is 9:54:58, the injection pressure 18.6 MPa which is the data 37 before the change and the data 38 after the change 12. 2 MPa is displayed as the change history. The molding condition change history data 32 may be changed in color from the actually measured molding data 33 or the character font may be changed to enhance the discrimination power.

The method of displaying the molding condition change history data 32 is not limited to the above, and the molding condition change history data 32 may be displayed in association with the part of the actually measured molding data 33 in the vertical direction in association with each other in time series. Alternatively, the actually measured molding data 33 and the change history data 32 may be arranged in separate tables in parallel. In that case, it is displayed in association with which part of the table of the measured molding data 33 the change history data 32 is inserted or corresponds. Accordingly, in the processing along the time series, in addition to the processes arranged in time series, the operator can understand the relationship between the time of the change history data 32 and the time of the actually measured molding data 33 on the same screen. Including those displayed in association. Needless to say, the time axis of the list may be provided in the horizontal direction instead of the vertical direction. Furthermore, only the actually measured molding data 33 of the injection filling time may be displayed in association with the change history data 32 of a specific item (for example, change history data of the injection filling time). Furthermore, the change history data 32 of a specific item may be shown in association with the average values of the measured molding data 33 before and after the change. Accordingly, in the present invention, the measured molding data 33 includes not only single measured data but also data such as an average value processed based on the measured molding data 33.

As described above, only the changed item portion of the molding condition change history data 32 with respect to the measured molding data 33 is arranged in time series and displayed in the list 31, and the graph 28 shows the measured molding data. In this method, only 33 is displayed as a waveform. However, according to the present invention, the molding condition change history data 32 may be displayed in association with the column 39 in which the shot number is written in the graph 28. In the present invention, either the graph 28 or the list 31 may be displayed on the display unit 18 of the display device 11.

Next, a case where the abnormal value 30 is displayed in the list 31 in association with the molding condition change history data 32 when the abnormal value 30 is detected in the detection value by the sensor 17 of the injection molding machine 10 will be described. In the present embodiment, the abnormality determination method is to send a plurality of actually measured molding data 33 stored in the abnormality determination unit 25 from the actual measurement molding data storage unit 23, and perform calculation processing in the abnormality determination unit 25 to obtain a standard deviation. The actually measured molding data 33 having the deviation is determined as abnormal. However, another calculation method may be used, or an operator may set and input an abnormal range in advance.

The measured molding data 33 determined to be the abnormal value 30 is arranged in time series in the same manner as the other measured molding data 33 and is compared with the change time of the molding condition change history data 32 in the data alignment unit 26. The molding condition change history data 32 is inserted or displayed in parallel in the form as shown in FIG. In the list 31, the actual molding data 33 of the shot number including the abnormal value 30 may be underlined to be distinguishable from the other actual molding data 33. In addition, the actual measurement data 33 displayed as the abnormal value 30 may be displayed by changing the background color, the character color, the line thickness, the font, or the like. It may be.

Then, the molding condition change history data 32 (time data 36 = 9: 54: 58, injection pressure 18.8 MPa → 12.2 MPa) changed immediately before the actual measurement molding data 33 displayed as the abnormal value 30, or immediately after that. The molding condition change history data 32 (time data 36 = 9: 57: 22, injection pressure 12.2 MPa → 16.6 MPa) is also displayed on the right side of the list 31 at the same level or one level below. . By performing such a display, the operator can easily grasp what item the molding condition has been changed before or after the actual measurement molding data 33 in which the abnormal value 30 is output. As a method of use by the operator, for example, when the abnormal value 30 increases (as a result, the number of defective products increases), the molding condition change history data immediately before the abnormal value 30 first appears. It is easy to look at the pre-change data 37 of 32 and quickly return to the molding conditions before the change. Also, even if the molding condition is changed from a certain abnormal value 30 and the abnormality no longer occurs, the abnormality no longer appears by looking at the data 38 after the change in the molding condition change history data 32 immediately after the abnormal value 30 is generated. The cause can be explored. Alternatively, the correlation with other molding conditions can be grasped. And about a molded article, shape changes, such as curvature, may appear within several hours to several days after completion | finish of shaping | molding. In addition, problems such as insufficient strength may occur after being used as a part. Furthermore, a difference may occur in the molded product due to temperature fluctuations. In the present invention, after such molding is completed, the molding condition change history at the time of molding is known for molding defects and molding tendency that do not appear immediately, and changes in molding defects and molding tendency that occur even if the same molding conditions are continued. It is effective for quality management from the viewpoint of traceability and can be used to formulate countermeasures.

In the above embodiment, the description has been given of the example in which the list 31 and the graph 28 are displayed by a plurality of data stored in the measured molding data storage unit 23 and the like in a state where the number of moldings has progressed over a certain level. In that case, it is easier to grasp the abnormal value 30 using the standard deviation. However, the display of the list 31 and the graph 28 may be performed in parallel with the molding. In that case, the range of the abnormal value 30 may be determined from the beginning, and the abnormal value 30 can be obtained later by calculation. Alternatively, the past measured molding data 33 may be deleted every time new measured molding data 33 is stored without storing only a fixed shot. Further, in the present embodiment, the molding condition change history data 32 and the abnormal value 30 are displayed in the list 31, but the molding condition change history data 32 is adjacent to or associated with the abnormal value 30 portion of the waveform 29 of the graph 28. May be displayed. The portion of the abnormal value 30 in the graph 28 can also be discriminated from the waveform 29, but the portion of the abnormal value 30 can be clearly seen in the column 39 indicating the shot number on the horizontal axis or the column indicating the time. The discriminating power of the abnormal value 30 may be increased by inserting a vertical line or the like.

In the above-described embodiment, both the normal measured molding data 33 and the measured molding data 33 in which the abnormal value 30 is output are displayed on the display unit 18 as the list 31, but the actual molding in which the abnormal value 30 is output. Only the data 33 and only the molding condition change history data 32 may be used as the list 31. Alternatively, only the actual measurement molding data 33 in which the abnormal value 30 appears, the normal actual measurement molding data 33 in a predetermined range before and after that, and the molding condition change history data 32 may be displayed on the list 31 and / or the graph 28.

Next, another embodiment of the storage processing of the time of the actually measured molding data 33 and the time of the molding condition change history data 32 will be described. In the present embodiment described above, the actual molding data 33 for a certain molding cycle (one shot) is sampled as the molding progresses, and the start time of the next molding cycle is collectively stored as that time (memory time). Is done. However, all the times of the actually measured molding data 33 for a certain molding cycle may be processed and stored as the time at the start of the molding cycle. Moreover, as the time of each actually measured molding data 33, the actual measurement time by the sensor 17 may be stored in the actual measurement data storage unit 23 as it is. Therefore, the time of the actually measured molding data 33 is not limited to the time derived from one method.

As for the time of the molding condition change history data 32, in the above-described embodiment, the changed time is stored as it is. However, if the change in the molding conditions is not reflected in the molding of the molding cycle (for one shot) and is reflected in the molding of the next molding cycle, the time entered by the operator for the change is the time of the change history. Rather, the time after the time when the next actually measured molding data 33 is stored at the start of the next shot is stored in the molding condition change history data storage unit 24 as the change time of the molding condition change history data 32. Is done. Specifically, when the molding conditions related to injection filling are changed in the middle of the molding cycle A1, the molding conditions related to injection filling change from the next molding cycle A2 without changing the molding conditions related to injection filling in the molding cycle A1. When set, the start time of the next cycle A2 is stored as the change time of the molding condition change history data 32. Therefore, the time of the molding condition change history data 32 is not limited to the time derived from one method.

Further, as in the above-described embodiment, the change of the molding condition is immediately stored as the time of the change history and immediately reflected in the molding of the molding cycle, but the actual measurement for the molding cycle (one shot). When processing for storing the molding data 33 as a start time for the next shot is performed, the following special processing may be performed. That is, when the molding condition most relevant to the item a is changed after the molding process of the item a is completed in one molding cycle, in the present embodiment, the molding condition change history data 32 → measured molding is performed. The data 33 are arranged in order. Therefore, in the list 31, the actually measured molding data 33 that does not reflect the change of the molding conditions is arranged behind the molding condition change history data 32. Therefore, the molding condition change history item is associated with the molding item that is most affected, and if the molding condition of the same item is changed after the molding item is completed within one molding cycle, the change is made. You may make it process so that the storage time of the historical data 32 may be arranged after the storage time of the actual measurement molding data 33 of the molding cycle. Such processing is not essential. The basis of the present invention is to compare the time of the actually measured molding data 33 and the time of the molding condition change history data 32 and align the actually measured molding data 33 and the molding condition change history data 32 in time series. As a matter of course, it is naturally included that the measured molding data 33 and the molding condition change history data 32 are aligned in time series with the same purpose and technical idea.

Next, another embodiment in which the display of the list 31 and the graph 28 is performed by the display unit 18 of the display device 11 such as the personal computer 41 outside the molding machine will be described with reference to FIG. In the embodiment shown in FIG. 1, an example is described in which these calculations and displays are performed in the display device 11 of the injection molding machine 10, the control device 12 of the unit, and the display unit 18 attached to the injection molding machine 10. However, the present invention is implemented using the personal computer 41 or PLC provided outside the molding machine that is connected to the control device 12 of the injection molding machine 10 by the communication line 42 or wirelessly or connected to an external memory to transfer data. It may be a thing. When the personal computer 41 is used, needless to say, the personal computer 41 itself includes the display unit 18, the setting unit 19, and the control device 43. Further, it is connected to a printer (not shown) as necessary.

By using a personal computer 41 and using spreadsheet software such as a commercially available Excel (registered trademark) and performing macro processing, the time of the actual molding data 33 and the modification time of the molding condition change history data 32 are displayed on the same sheet. The time axis can be rearranged to align the main. When Excel (registered trademark) is used, the display of the graph 28 having the waveform 29 as shown in FIG. 3 from the measured molding data 33 can be created without using special software. This is preferable because 30 portions can be easily discriminated. Also, the list 31 in which the times as shown in FIG. 2 are arranged in time series can be created without using special software. The graph 28 and the list 31 are displayed in parallel on the display unit 18 of the personal computer 41.

When the personal computer 41 is used, the measured molding data 33 and the molding condition change history data 32 may be on any side of the control device 12 of the injection molding machine 10, the control device 43 of the personal computer 41, and the external memory. Good. Further, the calculation process may be appropriately shared by the control measure 12 and the control device 43. Further, regarding the display of data, for example, the actual molding data 33 and the current molding conditions are displayed on the display unit 18 of the injection molding machine 10, and the molding condition change history data 32 is displayed on the display unit 18 side of the personal computer. Only the display processing is performed in association with the measured molding data 33, and the display unit 18 may be displayed in association with the measured molding data 33 so that the operator can easily compare both the display units 18. (Thus, the function of the block diagram of the control device 12 in FIG. 1 is included in the personal computer 41.) When using the personal computer 41, the injection molding machine while viewing the display unit 18 of the personal computer 41. The molding conditions may be corrected on the 10 display units 18 (setting unit 19) side. Therefore, the personal computer is preferably a portable notebook type.

  The molding machine used in the present invention can be applied to various molding machines such as an injection molding machine, a die casting machine, a press molding machine, a hollow molding machine, and a lamination molding machine. Further, the molding material is not limited.

DESCRIPTION OF SYMBOLS 10 Injection molding machine 11 Display apparatus 12 Control apparatus 14 Injection apparatus 15 Clamping apparatus 16 Actuator 17 Sensor 18 Display part 19 Setting part 20 Calculation part 21 Storage part 23 Actual molding data storage part 24 Change history data storage part 25 Abnormality judgment part 26 Data alignment unit 28 Graph 30 Abnormal value 31 List 32 Change history data 33 Actual molding data

Claims (4)

In the display device of a molding machine that displays measured molding data,
An actual molding data storage unit that stores actual molding data of each molding with time;
A molding condition change history data storage unit for storing a molding condition change history with time,
A data alignment unit that compares the measured molding data and the molding condition change history data in time series by comparing the measured molding data time and the molding condition change history data time,
A display device for a molding machine, characterized in that a display unit for displaying measured molding data and molding condition change history data in association with each other is provided outside the molding machine or the molding machine. An abnormality determination unit that determines that the measured value is abnormal when any measured molding data deviates more than a certain value
Compare the actual molding data time determined to be an abnormal value with the molding condition change history data time and compare the actual molding data including the actual molding data determined to be an abnormal value and the molding condition change history data. The display device for a molding machine according to claim 1, further comprising a data alignment unit that aligns the data in time series. In the display method of the molding machine that displays the measured molding data,
Stores actual molding data of molding with time and molding condition change history with time,
Compare the measured molding data time and molding condition change history data time to align the measured molding data and molding condition change history data in chronological order,
A display method for a molding machine, characterized in that measured molding data and molding condition change history data are displayed in association with each other on a molding machine or a display unit outside the molding machine. While displaying the actual molding data of each molding as a graph on the display,
4. The molding machine display method according to claim 3, wherein the actual molding data and the molding condition change history data are displayed in a list in association with the same display unit as the graph.