JP2011201098A - Method for treating abnormality of injection molding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To quickly restart an automatic operation capable of producing a conforming article, to avoid the trouble for largely degrading the production efficiency due to abnormality occurrence, and to optimize the treatment for abnormality with respect to a selected abnormality level.SOLUTION: When an abnormality related to a preselected abnormality level occurs, restart operation for an automatic operation can be allowed on condition that the abnormality is released before the first monitoring time Tc is up by counting the first monitoring time Tc from the time of the occurrence of the abnormality, and restart operation for the automatic operation can be allowed on condition that the abnormality is released after the first monitoring time Tc is up and purge processing is performed. The second monitoring time Tr is counted from the time up of at least the time of the occurrence of the abnormality or the first monitoring time Tc, and when the abnormality is not released before the second monitoring time Tr is up, the machine is shifted to a warming mode Hm after the second monitoring time Tr is up.

Description

  The present invention relates to an abnormality processing method for an injection molding machine that is performed when automatic operation is stopped due to an abnormality that has occurred during automatic operation of the injection molding machine.

  Generally, when any abnormality occurs during the automatic operation of the injection molding machine, the automatic operation (molding cycle) is promptly stopped in order to avoid secondary troubles. In this case, after stopping, the resin stays in the heating cylinder of the injection device, and if left as it is, problems such as resin burning occur, so automatic operation (molding cycle) is stopped due to the occurrence of an abnormality. At the same time, necessary abnormality processing is performed.

  Conventionally, as a method for such abnormal processing, a method for preventing resin burn of a resin molding apparatus disclosed in Patent Document 1 is known. In the Document 1, a resin is heated and melted to be melted. When molding with a resin, the temperature of the resin is decreased when the molding cycle is stopped, and the resin is forcibly moved when the set time has elapsed after the molding cycle is stopped. A resin burn prevention method for a resin molding apparatus that is set to be shorter than the maximum residence time that does not cause burn is disclosed.

JP-A-7-266394

  However, the above-described conventional abnormality processing method for an injection molding machine (resin burn prevention method for a resin molding apparatus) has the following problems.

  First, when the molding cycle is stopped, the temperature of the resin is lowered, and after the molding cycle is stopped, the resin is forced to move when the set time has elapsed, so the occurrence of resin burn is Although it is avoided, when the operation is restarted due to the temperature drop of the heating cylinder, a reheating process is required. Therefore, it takes time until the operation is resumed, in particular, the production of non-defective products becomes possible, leading to a decrease in production efficiency.

  Second, there are various types of abnormalities that occur in injection molding machines, especially abnormalities with different levels (importance), but the conventional method is performed uniformly regardless of the abnormal level. Therefore, it may not always be an appropriate abnormality process. For this reason, there is a room for further improvement from the viewpoint of optimizing the abnormality processing because defects such as damage to the mold or increased molding defects are likely to occur.

  The object of the present invention is to provide an abnormality processing method for an injection molding machine that solves the problems existing in the background art.

  An abnormality processing method for an injection molding machine according to the present invention is an abnormality processing method performed when automatic operation is stopped due to an abnormality that occurred during automatic operation of the injection molding machine M in order to solve the above-described problem. If an abnormality related to the selected one or two or more predetermined abnormality levels has occurred, by measuring the preset first monitoring time Tc from the time of occurrence of the abnormality, the abnormality occurs before the first monitoring time Tc is up. On the condition that the automatic operation restart operation is allowed, and the abnormality is released after the first monitoring time Tc is up, and the preset purge process is performed. The resuming operation is allowed, and the second monitoring time Tr is timed at least when an abnormality occurs or when the first monitoring time Tc is up, and the second monitoring time Tr is up. When not abnormality released, after timeout of the second monitoring time Tr, characterized in that shifting to insulation mode Hm previously set.

  In this case, according to a preferred aspect of the invention, it is desirable to apply an abnormal level that stops the molding cycle without shutting off the power source as the abnormal level. In addition, the third monitoring time Ts is timed simultaneously with the time of the first monitoring time Tc, and the restart operation of the automatic operation is allowed on condition that the purge process is performed after the third monitoring time Ts is up. can do. Further, if the abnormality is canceled before the first monitoring time Tc is timed up, the second monitoring time Tr is counted from the cancellation, and the automatic operation restart operation is performed before the second monitoring time Tr is timed up. When is not performed, the restart operation of the automatic operation can be allowed on the condition that the purge process is performed after the second monitoring time Tr is up. When performing the purge process, a predetermined purge process screen can be displayed on the display 3 attached to the molding machine controller 2. In the purge process, operation conditions corresponding to molding conditions during automatic operation are set, and a predetermined number of shots N in which the operation of discharging the resin in the heating cylinder 4 in the injection device Mi to the outside in accordance with the operation conditions is set in advance. Can only be done. Furthermore, after switching to the heat retention mode Hm, it is possible to allow the automatic operation resumption operation on condition that a predetermined resumption return process is performed.

  According to the abnormality processing method of the injection molding machine M according to the present invention by such a method, the following remarkable effects can be obtained.

  (1) On the condition that the abnormality is canceled before the first monitoring time Tc is up, the restart operation of the automatic operation is allowed, and the abnormality is canceled after the first monitoring time Tc is up, and On the condition that the purge process is performed, the automatic operation restart operation is allowed, and when the abnormality is not canceled before the second monitoring time Tr is timed up, the heat retention mode is set after the second monitoring time Tr is timed up. Since it is made to shift to Hm, the re-heating process at the time of restarting the automatic operation becomes unnecessary until the second monitoring time Tr is up. Therefore, the automatic operation capable of producing good products can be resumed promptly, and it is possible to avoid the problem that the production efficiency is greatly reduced due to the occurrence of an abnormality.

  (2) If an abnormality related to a preselected abnormality level occurs, the first monitoring time Tc is counted from the time of occurrence, so that the abnormality is canceled before the first monitoring time Tc is up. Selected to allow the restart operation of the automatic operation to be acceptable and on the condition that the abnormality is canceled after the first monitoring time Tc is up and the purge process is performed. It is possible to optimize the abnormality processing for the abnormality level. Therefore, problems such as occurrence of damage to the mold and increase in molding defects can be avoided.

  (3) If an abnormal level (level 2 to 4) that stops the molding cycle without shutting off the power supply is applied to the abnormal level according to a preferred mode, it becomes possible to perform in the most desirable mode. Greater performance can be obtained from the viewpoint of optimization.

  (4) According to a preferred embodiment, the automatic monitoring is performed on the condition that the third monitoring time Ts is measured simultaneously with the time of the first monitoring time Tc, and purge processing is performed after the third monitoring time Ts is up. If the restart operation is allowed, the allowable time for the resin residence time from the time of occurrence of the abnormality can be set directly, and therefore the second monitoring time Tr that varies depending on when the abnormality is released is set. However, it is possible to allow the restart operation of the automatic operation without causing unnecessary delay.

  (5) According to a preferred embodiment, if the abnormality is canceled before the first monitoring time Tc is timed up, the second monitoring time Tr is counted from the cancellation, and before the second monitoring time Tr is timed up. When the automatic operation restart operation is not performed, if the automatic operation restart operation is allowed on the condition that the purge process is performed after the second monitoring time Tr is up, the operator can inject a plurality of injections. In the state in which the molding machines M are managed, for example, two of the injection molding machines M ... have an abnormality almost simultaneously, and the operator cancels the abnormality of one of the injection molding machines M automatically. Even if the next injection molding machine M is processed quickly without resuming the operation, the residence time of the resin in one injection molding machine M becomes longer, and the automatic operation is resumed. The operation is delayed A case can be avoided.

  (6) According to a preferred embodiment, when performing a purge process, if a predetermined purge process screen is displayed on the display 3 attached to the molding machine controller 2, the purge process screen is forcibly taught to execute the purge process. Therefore, the purge process can be executed reliably and related information such as the magnitude of the abnormality level and necessary messages can be displayed, so that a more accurate process for the abnormality can be performed.

  (7) According to a preferred aspect, as the purge process, an operation condition corresponding to the molding condition during automatic operation is set, and an operation for discharging the resin in the heating cylinder 4 in the injection device Mi to the outside in accordance with the operation condition is preset. If the predetermined number of shots N is performed, the automatic operation capable of producing non-defective products can be promptly restarted after the purge process.

The flowchart for demonstrating the process sequence of the abnormality processing method which concerns on suitable embodiment of this invention, Schematic configuration diagram of an injection molding machine that can implement the abnormality processing method, A flow chart for explaining the overall processing when an abnormality occurs, including the abnormality processing method; A timing chart showing a processing procedure of the abnormality processing method, A flowchart for explaining a processing procedure when a part of monitoring conditions in the abnormality processing method is changed; FIG. 5 is a timing chart showing a processing procedure of the abnormality processing method in FIG.

  Next, preferred embodiments according to the present invention will be given and described in detail with reference to the drawings.

  First, the configuration of an injection molding machine M that can implement the abnormality processing method according to the present embodiment will be described with reference to FIG.

  FIG. 2 shows the overall configuration of the injection molding machine M. The illustrated injection molding machine M is hydraulic, and includes an injection device Mi and a mold clamping device Mc on the upper surface of the machine base Mb. The injection device Mi is supported on the machine base Mb via the injection device advance / retreat mechanism 11 using a hydraulic cylinder. The injection device Mi includes a heating cylinder 4, which has an injection nozzle 12 at the tip of the heating cylinder 4 and a hopper 13 attached to the rear portion of the heating cylinder 4. A heater 14 such as an electrothermal band heater is attached to the outer periphery of the heating cylinder 4 and the injection nozzle 12, and a temperature sensor such as a thermocouple is attached to the heated portion of the heating cylinder 4 and the injection nozzle 12. The The temperature sensor and heater 14 are connected to the temperature adjustment unit 35. Furthermore, a screw 15 is loaded inside the heating cylinder 4, and a screw driving unit 16 that drives the screw 15 is provided at the rear end of the heating cylinder 4. The screw drive unit 16 includes an injection cylinder 17 that drives the screw 15 forward and backward, and a metering motor (oil motor) 18 that rotationally drives the screw 15.

  The mold clamping device Mc includes a fixed plate 22 and a movable plate 23 that support the mold 21, and includes a mold clamping cylinder 24 that opens and closes the mold 21 and drives the mold 21 by driving the movable plate 23 forward and backward. A movable platen drive unit 25 is provided, and the fixed platen 22 and the movable platen drive unit 25 are fixedly installed on the upper surface of the machine base Mb. In addition, the movable plate 23 incorporates a protruding cylinder for ejecting a molded product (ejector) from the opened mold 21. The hydraulic cylinder, injection cylinder 17, metering motor 18, mold clamping cylinder 24, and protruding cylinder of the above-described injection device advance / retreat movement mechanism 11 are connected to a hydraulic drive unit 26 including a hydraulic pump and a valve circuit.

  On the other hand, the injection molding machine M includes a molding machine controller 2. The molding machine controller 2 includes a controller body 31 having a computer function for controlling the entire injection molding machine M, and executes various arithmetic processes and control processes. Therefore, the controller main body 31 is attached with a memory unit 32 having a control program storage function and various data storage functions. Further, the molding machine controller 2 (controller main body 31) includes a timer unit 33 for time measurement and an abnormality monitoring function unit 34 as functional parts used in the abnormality processing method according to the present embodiment. Includes an abnormality detection unit 34d and an abnormality level determination unit 34c.

  In this case, the timer unit 33 includes three timers: an abnormality release monitoring timer, a stay monitoring timer, and a stop monitoring timer. The abnormality release monitoring timer is a timer that measures a preset first monitoring time Tc when an abnormality occurs, and monitors whether or not the abnormality is released within the first monitoring time Tc. The monitoring time Tc can be arbitrarily set in the range of 1 to 99 [seconds], for example. The residence monitoring timer is a timer for measuring a preset second monitoring time Tr and monitoring an allowable limit at which the resin staying in the heating cylinder 4 is not burned by the second monitoring time Tr. The monitoring time Tr can be arbitrarily set in the range of 1 to 20 [minutes], for example. Further, the stop monitoring timer is a timer that counts a preset third monitoring time Ts and monitors a limit time when the abnormality is not canceled due to, for example, the absence of the operator, based on the third monitoring time Ts. The third monitoring time Ts can be arbitrarily set in the range of 1 to 999 [seconds], for example.

  When any abnormality occurs during automatic operation, the abnormality monitoring function unit 34 detects the abnormality by the abnormality detection unit 34d and determines the level of the abnormality detected by the abnormality level determination unit 34c, that is, the content of the abnormality ( It has a function of determining (ranking) six abnormal levels (levels 0 to 5) according to importance. It does not matter whether the detection is active or passive. In the abnormal level, level 0 or 1 is a minor abnormal level such as forgetting to turn off the switch whose abnormality is not directly related to the molding operation by automatic operation, and level 2 is error detection by the sensor or molding machine body or product quality determination An abnormal level that occurs based on a monitor or the like, level 3 is an abnormal level that includes a cycle error such as not reaching the target position within the cycle time during automatic operation, and level 4 is a mold clamping abnormality (mold Level 5 is a serious abnormality that is directly related to the molding operation by automatic operation and requires urgentness, for example, such as protection abnormality, abnormality that does not reach the set clamping position and clamping pressure) , Abnormalities related to safety such as opening the safety door on the non-operation side, or abnormalities such as when the controller body 31 or temperature board etc. It is a serious abnormal levels, including.

  Further, the temperature control unit 35 and the hydraulic drive unit 26 are connected to the control output unit of the controller main body 31. Further, the molding machine controller 2 is provided with a setting unit 36 and a display (display unit) 3 that can perform various settings. In this case, the display 3 displays a purge processing screen used for carrying out the abnormality processing method according to the present embodiment, and a touch panel capable of touch input is attached to the display 3, and the display 3 is a setting unit together with the touch panel. 36 is also used. Therefore, the setting unit 36 can set the monitoring times Tc, Tr, and Ts described above.

  Next, an abnormality processing method according to this embodiment using the injection molding machine M configured as described above will be described with reference to FIGS.

  First, the outline of the entire abnormality process in the injection molding machine M will be described with reference to the flowchart shown in FIG.

  Now, let us assume a case where some abnormality has occurred in a state where automatic operation is normally performed (steps S21 and S22). Thus, the abnormality that has occurred is detected by the abnormality detection unit 34d, and the rank of the abnormality level of the detected abnormality is determined by the abnormality level determination unit 34c. At this time, when the abnormal level is determined to be the level 0 or 1, the error is minor and only an error message such as a warning / status display is displayed on the display 3 (steps S23, S24, S25). On the other hand, when the abnormal level is determined to be level 5 as described above, since it is a serious abnormality, control for forcibly shutting off the power is performed (steps S23, S24, S26, S27). Therefore, in this case, since the power supply including the power supply to the heater 14 is cut off, after the abnormality is released, it is possible to resume the automatic operation by performing at least the necessary recovery process including the temperature raising process and the purge process. (Steps S28 and S29).

  On the other hand, when it is determined that the abnormality level is the above-described level 2 to 4, abnormality processing is performed by the abnormality processing method according to the present embodiment (the present invention) (steps S23 and S30). When an abnormality of level 2 to 4 occurs, the power supply is not shut off unlike level 5, but the molding cycle is stopped. In this way, if the abnormal level (level 2 to 4) that stops the molding cycle without shutting off the power supply is applied to the abnormal level, the implementation in the most desirable mode is possible, so the abnormality processing is optimized. Greater performance can be obtained from the viewpoint of aiming.

  Next, the abnormality processing method according to the present embodiment will be described with reference to the flowchart shown in FIG. 1 and the timing chart shown in FIG.

  When it is determined that the abnormality that occurred during the automatic operation is level 2 to 4, in the molding machine controller 2, the abnormality cancellation monitoring timer in the timer unit 33 starts counting the preset first monitoring time Tc (step) S1). At the same time, the stop monitoring timer in the timer unit 33 starts measuring the preset third monitoring time Ts (step S2).

  At this time, if the operator notices an abnormality and immediately cancels the abnormality, the automatic operation resumption operation is allowed. Therefore, the operator can resume the automatic operation as it is by performing the automatic operation resumption operation. (Steps S3, S5, S6). When the abnormality is released, the stay monitoring timer in the timer unit 33 starts measuring the second monitoring time Tr (steps S3 and S4). Such a simple resumption operation is effective until the first monitoring time Tc is up. Thus, the automatic operation can be resumed as it is within the first monitoring time Tc (1 to 99 [seconds]) in which the time has not passed since the occurrence of the abnormality.

  On the other hand, if an operator is absent when an abnormality occurs, the first monitoring time Tc, which is set as a relatively short time, is up without canceling the abnormality. When the first monitoring time Tc is up, the stay monitoring timer in the timer unit 33 starts measuring the second monitoring time Tr (steps S7 and S8). Note that the second monitoring time Tr may be the same as the second monitoring time Tr that starts timing when the above-described abnormality is canceled, or a different length of time may be set. The second monitoring time Tr in the embodiment is the same. If the operator cancels the abnormality before the second monitoring time Tr expires, a purge process screen is displayed on the display 3 attached to the molding machine controller 2 (steps S9 and S10). By displaying this purge process screen, execution of the purge process is taught and automatic operation resumption operation is not allowed unless the purge process is executed. By forcibly displaying such a purge process screen, in addition to prompting the execution of the purge process, it is possible to display related information such as a rank of an abnormal level and a necessary message. Therefore, the operator can surely execute the purge process and can perform a more accurate process for the abnormality.

  As a result, when the operator turns on the execution of the purge process from the purge process screen, the purge process is performed according to a preset sequence program (step S11). In this case, the purge process sets an operation condition corresponding to the molding condition during the automatic operation, and the operation of discharging the resin in the heating cylinder 4 in the injection device Mi to the outside by the operation condition is a predetermined shot set in advance. This is performed N times (N is an arbitrary number). By performing such a purging process, the automatic operation capable of producing a good product can be promptly restarted after the purging process.

  On the other hand, if the abnormality is not canceled before the second monitoring time Tr is timed up, the second monitoring time Tr is timed up to shift to the heat retention mode Hm in which the temperature is lowered to a preset heat retention temperature (step). S12, S13). After the transition to the heat retention mode Hm, the automatic operation resumption operation is allowed on condition that a predetermined resumption return process is performed. Therefore, when resuming the automatic operation, the operator can perform a predetermined resumption return process including a re-temperature raising process and a purge process, and then can resume the automatic operation (step S14).

  On the other hand, since the third monitoring time Ts is timed by the stop monitoring timer, for example, even when the operator is absent and the mode is shifted to the heat retention mode Hm, the purge processing is performed by the time-up of the third monitoring time Ts. The screen is forcibly displayed to teach execution of the purge process (step S15). Therefore, the restart operation of the automatic operation is allowed on the condition that the purge process is performed after the third monitoring time Ts is up. If such a third monitoring time Ts is used, the allowable time for the resin residence time from the time of occurrence of the abnormality can be directly set, and therefore the second monitoring time Tr that varies depending on the timing at which the abnormality is released is set. Even so, the restart operation of the automatic driving can be allowed without causing unnecessary delay.

  In addition, there may be a case where the operation restart operation is not performed even though the abnormality is canceled before the above-described first monitoring time Tc is up. For example, in a state where the operator manages a plurality of injection molding machines M, an abnormality occurs in the two injection molding machines M almost simultaneously, and the operator cancels the abnormality of one injection molding machine M. Nevertheless, it is possible to assume a case where the abnormality of the next injection molding machine M is processed quickly without performing the restart operation of the automatic operation. In this case as well, the purge process screen is forcibly displayed when the second monitoring time Tr, which starts timing when the abnormality is canceled, is instructed to execute the purge process. Accordingly, it is possible to avoid the problem that the residence time of the resin in one injection molding machine M becomes long and the restart operation of the automatic operation is delayed.

  As shown in FIG. 4, when the third monitoring time Ts is timed up, when the second monitoring time Tr is started when the abnormality is canceled, the first monitoring time Tc is the time. Since the conditions for displaying the purge process screen are satisfied at the time when the abnormality is canceled after the upgrade, the purge process screen is displayed when the condition is satisfied first among them.

  In this way, even when an abnormality occurs and the molding cycle is stopped, a uniform abnormality process is not performed, but simple resumption is possible as shown in FIG. The automatic operation is performed based on the zone Z1, the post-purge resumable zone Z2 that can be resumed by the execution of the purge process, and the warming mode zone Z3 that can be resumed after performing the predetermined restart recovery process after the transition to the thermal insulation mode Hm. It can be resumed.

  Therefore, according to the abnormality processing method according to this embodiment, the restart operation of the automatic operation can be permitted on the condition that the abnormality is canceled before the first monitoring time Tc is up, and the first On the condition that the abnormality is canceled after the one monitoring time Tc is timed up and purge processing is performed, the restart operation of the automatic operation is allowed and the abnormality is not canceled before the second monitoring time Tr is timed up. When the second monitoring time Tr is up, the temperature is shifted to the heat retention mode Hm. Therefore, until the second monitoring time Tr is up, the re-heating process at the time of restarting the automatic operation becomes unnecessary. Therefore, the automatic operation capable of producing good products can be resumed promptly, and it is possible to avoid the problem that the production efficiency is greatly reduced due to the occurrence of an abnormality. In addition, if an abnormality related to the selected abnormality level occurs, the first monitoring time Tc is counted from the time of occurrence, so that the abnormality is canceled before the first monitoring time Tc is up. The selected abnormality level is set to allow the restart operation of the operation and to allow the restart operation of the automatic operation on condition that the abnormality is canceled after the first monitoring time Tc is up and purge processing is performed. Can be optimized. Therefore, it is possible to avoid problems such as occurrence of damage to the mold and increase in molding defects.

  On the other hand, in FIG.5 and FIG.6, the process sequence at the time of changing some monitoring conditions in the abnormality processing method which concerns on this embodiment is shown with a flowchart. FIG. 5 is an example in which the timing of counting the stay monitoring timer is different from that in FIG. 1, and the stay monitoring timer is counted from the time when an abnormality occurs. Accordingly, as shown in FIG. 6, the second monitoring time Tr set in the stay monitoring timer is timed from the time of occurrence of an abnormality and is timed up as the second monitoring time Tr elapses. In contrast, the first monitoring time Tc and whether or not the abnormality has been canceled are not affected. Also in this case, the first monitoring time Tc, the second monitoring time Tr, and the third monitoring time Ts are used, and basically the same effect as in the case of FIG. 1 can be obtained. Therefore, in FIG. 5, the same steps (same processes) as in FIG. 1 are denoted by the same reference numerals, and the detailed description thereof is omitted by clarifying the configuration. In FIG. 6, the same functional parts as those in FIG. 4 are denoted by the same reference numerals and characters, and the detailed description thereof is omitted by clarifying the configuration.

  The preferred embodiment has been described in detail above, but the present invention is not limited to such an embodiment, and the detailed configuration, method, quantity, numerical value, and the like are within the scope not departing from the gist of the present invention. , Can be changed, added and deleted arbitrarily. For example, although the case where the abnormal level selected in advance is applied to levels 2 to 4 in six stages, it can be arbitrarily set (selected) such as levels 3 to 7 in ten stages. Further, the case where the purge process screen is displayed on the display 3 when performing the purge process is illustrated, but in this case, it is not always necessary to display the purge process screen, and a simple message or alarm sound may be used. . Therefore, the operator may display the purge process screen based on the message or alarm sound and execute the purge process. Furthermore, the cancellation of the abnormality may be based on an action that the operator has canceled the abnormality, or may be based on an operation of another abnormality cancellation end key or the like after the abnormality is canceled.

  The abnormality processing method according to the present invention can be used when automatic operation is stopped due to an abnormality that occurs during automatic operation of various injection molding machines.

  2: molding machine controller, 3: display, 4: heating cylinder, M: injection molding machine, Mi: injection device, Tc: first monitoring time, Tr: second monitoring time, Ts: third monitoring time, Hm: heat retention mode

Claims (7)

  In the abnormality processing method of the injection molding machine that is performed when the automatic operation is stopped due to an abnormality that occurred during the automatic operation of the injection molding machine, if an abnormality related to one or more predetermined abnormal levels selected in advance occurs, By allowing the first monitoring time set in advance from the time of occurrence of the above, allowing the restart operation of the automatic operation to be permitted on condition that the abnormality is canceled before the first monitoring time is up, and On the condition that the abnormality is canceled after the first monitoring time is up and the preset purge process is performed, the automatic operation restart operation is allowed and at least when the abnormality occurs or the first monitoring When the second monitoring time is counted from the time up, and the abnormality is not cleared before the second monitoring time is up, after the second monitoring time up , Abnormality processing method of an injection molding machine, characterized in that shifting to insulation mode set in advance.   The abnormality processing method for an injection molding machine according to claim 1, wherein an abnormality level for stopping a molding cycle without shutting off a power source is applied as the abnormality level.   Simultaneously with the timing of the first monitoring time, the third monitoring time is counted, and the purge operation is performed after the third monitoring time is up, allowing the restart operation of the automatic operation to be allowed. The abnormality processing method for an injection molding machine according to claim 1 or 2.   If the abnormality is canceled before the first monitoring time expires, the second monitoring time is counted from the cancellation, and the automatic operation restart operation is not performed before the second monitoring time expires. 4. The injection molding machine according to claim 1, wherein resuming operation of automatic operation is allowed on condition that the purge process is performed after the second monitoring time is up. 5. Abnormality handling method.   The abnormality processing method for an injection molding machine according to any one of claims 1 to 4, wherein when performing the purge processing, a predetermined purge processing screen is displayed on a display attached to the molding machine controller.   The purge process sets an operation condition corresponding to the molding condition during the automatic operation, and performs an operation of discharging the resin in the heating cylinder in the injection device to the outside by the operation condition for a predetermined number of shots set in advance. An abnormality processing method for an injection molding machine according to any one of claims 1 to 5.   The automatic operation resuming operation is allowed after the switching to the heat retention mode, on condition that a predetermined resuming return process is performed in advance. Method for abnormal processing of injection molding machines.

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