JP2016215541A - Injection molding machine and control method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an injection molding machine capable of performing purge of a hot runner well and a control method thereof.SOLUTION: An injection molding machine 11 comprises: a mold clamping device 14 to which a mold 24 with a hot runner 31 can be attached; and an injection device 13. The injection molding machine further comprises: a controller 35 comprising plural automatic purge modes, containing an automatic purge mode for performing purge of the hot runner 31, and selecting or starting the automatic purge mode for performing purge of the hot runner 31 out of the plural automatic purge modes, in linkage with nozzle touch detection of the injection device 13.SELECTED DRAWING: Figure 1

Description

The present invention relates to an injection molding machine including a mold clamping device and an injection device to which a mold having a hot runner can be attached.

Discharging the resin staying inside the injection molding machine to the outside of the injection molding machine is called purging. Purging uses the same resin when restarting after interruption of molding, in addition to changing the staying resin to a different resin. It is also carried out when the resin staying in the air is discharged to the outside. The purge performed using the same resin is positively performed in an injection molding machine for molding an optical molded product in which deterioration or yellowing of the resin is a problem. Further, purging is generally performed to discharge the resin staying in the heating cylinder including the inside of the nozzle hole to the outside. However, in a mold having a hot runner, the resin staying in the hot runner is discharged. Is also done.

On the other hand, when purging is classified from the work surface or the control surface, purging is performed by manual purging in which the operator operates all the screw rotation buttons and the execution buttons of the injection button in the manual mode, and the purge button in the manual mode. The automatic purge that operates until the purge is completed in accordance with the preset conditions, and the operation from the start of the purge to the completion of the purge without the operator's operation when the power of the molding machine is turned on or the heater is energized. It is broadly classified as an automatic purge that performs operation (fully automatic purge).

Conventionally, what was described in patent document 1 and patent document 2 is known as what performs an automatic purge. In Patent Document 1, when one of four types of purge operation modes of color change purge, material removal purge, dimension stop purge, and hot runner purge is selected and input from the touch panel, the stored purge conditions are read and the purge operation program is It is described to be executed. In Patent Document 1, in the purge operation mode of the hot runner purge, in order to quickly discharge the molten resin that does not easily flow from the thin resin flow path in the hot runner, the injection screw is operated at a high speed and a high pressure as a purge condition. It is described that a condition to be activated by an injection operation is set.

In Patent Document 2, the screw cold start prevention relay after the recovery from the power failure is turned on, the temperature rises to a predetermined heating cylinder temperature, and the residual resin is remelted. It is described to do.

However, Patent Document 1 has a problem that when an operator selects the hot runner purge operation mode, the hot runner purge starts regardless of the state of the injection molding machine. Therefore, particularly when the temperature of the hot runner is not sufficiently raised, the screw or the hot runner may be damaged. Moreover, in patent document 1, even if the temperature of the hot runner is sufficiently raised, since the injection is performed at a high injection speed, the screw or the hot runner may be damaged. Further, when the nozzle touch is not performed even when the hot runner purge is selected, there is a problem that the purge performed only in the normal heating cylinder is performed in the operation mode of the hot runner purge.

In Patent Document 2, automatic purge is performed after the cold start prevention relay of the screw is released. If the temperature of the hot runner is not sufficiently raised, the screw or hot runner is connected to the screw or hot runner as in Patent Document 1. In some cases, it would cause damage. Furthermore, although Patent Document 2 does not describe in detail the prevention of cold start, it takes a long time to raise the temperature of the heating cylinder to the release temperature after the interruption of molding, and automatic purge is performed after release. In some cases, the start of molding was delayed.

JP 2002-307510 A (Claims 1, 0002, 0019, 0026, FIG. 2) JP 2000-202886 A (0019)

In view of the above problems, an object of the present invention is to provide an injection molding machine and a method for controlling the injection molding machine that can perform hot runner purge well.

According to a first aspect of the present invention, there is provided an injection molding machine having an automatic purge mode for purging a hot runner in an injection molding machine having a mold clamping device and an injection device to which a mold having a hot runner can be attached. And a control device that selects or starts an automatic purge mode that purges the hot runner in conjunction with nozzle touch detection of the injection device from the plurality of automatic purge modes. It is characterized by.

The injection molding machine according to claim 2 of the present invention is characterized in that, in claim 1, the position of the movable platen or the movable mold is a start condition of an automatic purge mode in which the hot runner is purged.

The injection molding machine according to claim 3 of the present invention is characterized in that, in claim 1 or claim 2, the detected temperature of the hot runner is a start condition of an automatic purge mode for purging the hot runner.

According to a fourth aspect of the present invention, there is provided a control method for an injection molding machine comprising: a mold clamping device capable of mounting a mold having a hot runner; and an injection molding machine control method having an injection device. The automatic purge mode has a plurality of automatic purge modes including an automatic purge mode for performing the hot runner, and the injection speed of the automatic purge mode for purging the hot runner is lower than the injection speed of the automatic purge mode for purging only the heating cylinder It is characterized by.

An injection molding machine according to the present invention includes a plurality of automatic purge modes including an automatic purge mode for purging a hot runner in an injection molding machine having a mold clamping device and an injection device to which a mold having a hot runner can be attached. And a control device for selecting or starting an automatic purge mode for purging the hot runner in conjunction with nozzle touch detection of the injection device from among the plurality of automatic purge modes. Can be performed satisfactorily.

1 is an overall view of an injection molding machine according to an embodiment of the present invention. It is a flowchart figure of hot runner automatic purge mode execution of the injection molding machine of embodiment of this invention. It is a figure which shows the relationship between the temperature increase of the heating cylinder and hot runner of the injection molding machine of embodiment of this invention, and hot runner automatic purge mode execution.

First, an outline of a configuration of an injection molding machine 11 according to an embodiment of the present invention will be described with reference to FIG. The injection molding machine 11 includes an injection device 13 and a mold clamping device 14 on a bed 12. The injection device 13 is provided with a heating cylinder 15 (including a cylinder head) in which an unillustrated screw is incorporated in an inner hole so as to be able to move forward and backward. A nozzle 16 is fixed to the tip of the heating cylinder 15. The nozzle 16 and the heating cylinder 15 are provided with a heater and a temperature sensor (not shown) for controlling the temperature of the nozzle 16 and the heating cylinder 15. A housing portion 18 having a supply hole for supplying material into the heating cylinder 15 is provided in the vicinity of the rear portion of the heating cylinder 15 of the injection device 13. The injection device 13 includes a metering servo motor 19 for a screw rotation mechanism for rotating the screw, and an injection servo motor for the injection mechanism for performing injection (including injection during purge) by moving the screw back and forth. 20 is provided. The rotational speed and rotational speed of the screw can be detected by the rotary encoder 19a of the measuring servo motor 19, and the screw position and the injection speed in the heating cylinder 15 can be detected by the rotary encoder 20a of the injection servo motor 20. ing. The injection device 13 includes a load cell (not shown) that detects a force acting in the axial direction of the screw, and detects the value of the load cell and performs back pressure control during measurement using the injection motor 20. Yes. Further, in a purge mode to be described later, the metering motor 19 and the injection motor 20 are driven to perform a purge for discharging the staying molten resin.

Further, the injection device 13 includes a nozzle touch device 17 for moving the entire injection device 13 back and forth with respect to the mold clamping device 14 and causing the nozzle 16 to touch the die (the nozzle touch surface 24a of the fixed die 24). A hydraulic cylinder 21 is provided. The hydraulic circuit for supplying hydraulic oil from the pump 22 to the hydraulic cylinder 21 is provided with a hydraulic sensor 23 for confirming the pressure increase of the cylinder, and it is possible to confirm whether or not the nozzle is touched. The actuator of the injection device 13 may be a part or all of the actuator using an electric motor or hydraulic pressure, and a sensor corresponding to the type of the actuator is attached.

The mold clamping device 14 includes a fixed plate 25 to which a fixed mold 24 can be attached, a movable plate 27 to which a movable die 26 can be attached, and a hydraulic cylinder 28 attached to the back of the movable plate 27 and serving as a mold opening / closing mechanism. And a pressure receiving plate 29 to which the hydraulic cylinder 28 is attached, and four tie bars 30 provided between the fixed plate 25 and the pressure receiving plate 29 and inserted through the movable plate 27. The injection molding machine 11 includes a safety door and a safety cover (not shown). The mold clamping mechanism may be a mechanism in which a toggle mechanism is operated by an electric motor or a hydraulic cylinder, or a mold clamping mechanism and a mold opening / closing mechanism provided separately. Further, the pressure receiving plate 29 is not essential, and may be composed of two bases, a fixed base and a movable base, and one of the bases may be provided with a hydraulic cylinder of a mold clamping mechanism.

Various molds can be attached to the injection molding machine 11 of the present invention, but a mold provided with a hot runner 31 can be similarly attached. In the present embodiment, the hot die runner 31 is provided in the fixed mold 24, but the movable die 26 may be provided with a hot runner. As known in the art, the hot runner 31 can heat the resin flow path to the cavity, increasing the degree of freedom of the gate arrangement position, saving unnecessary resin required for the cold runner, The effect is to speed up the molding cycle. The hot runner 31 includes a plurality of heaters 32 and a temperature sensor 33 that detects a plurality of temperatures. The hot runner 31 may or may not have a valve gate for closing the nozzle 34 portion. In addition, the hot runner 31 is controlled by a control device 35 of the injection molding machine 11 as in the present embodiment, and is controlled by a control device dedicated to an external hot runner. However, the type of the hot runner 31 is not limited in the present invention.

The injection molding machine 11 includes a control device 35 and a setting device 37 connected to the control device 35 via a signal line 36. In the present embodiment, the setting device 37 is a setting display screen including a touch panel that can perform setting and display. If only the part related to the present invention is described as a functional block diagram with respect to the control device 35, the hydraulic sensor 23 for detecting the pressure of the hydraulic oil in the hydraulic cylinder 21 of the nozzle touch device 17 and the temperature sensor 33 for detecting the temperature of the hot runner 31. And an input / output unit 38 connected to each other. An arithmetic processing unit 39 is connected to the input / output unit 38. The arithmetic processing unit 39 includes a purge mode selection processing unit 40 for selecting or starting an automatic purge mode (hereinafter, abbreviated as “automatic purge mode for hot runner”) for purging the hot runner described later. A storage unit 41 is connected to the arithmetic processing unit 39. The storage unit 41 stores a plurality of automatic purge modes such as the hot runner automatic purge mode set in advance by the setting device and the automatic purge mode only for the heating cylinder 15 and the nozzle 16.

Next, a control method of the injection molding machine 11 according to the present embodiment, particularly an automatic purge of the hot runner will be described. This embodiment assumes molding of an optical molded product such as a light guide plate and does not involve replacement of resin materials (including molding problems other than at the start of molding on the 1st, interruption due to power failure, etc.) ) Is also automatically purged. The purpose of automatic purging of the hot runner is to retain the resin (melted a plurality of times) in the hot runner 31 (particularly, the connecting portion of the members constituting the flow path, the bent portion of the flow path, etc.). This is because the resin that deteriorates due to the deterioration of the optical characteristics is discharged and is not mixed into a molded product such as a light guide plate.

The operator completes the setting of the automatic purge mode for the hot runner from the setting device 37 in advance. The setting items of the automatic purge mode for the hot runner include the purgeable temperature ht1 of the interlocking hot runner 31 for preventing the screw and the hot runner 31 from being overloaded by the purge, and the purge of the heating cylinder 15 Possible temperature vt1 is raised. In this embodiment, the purgeable temperatures ht1 and vt1 are input as absolute temperatures, but relative temperatures (plus or minus values) may be input for one of the temperatures, and the injection molding machine 11 side is fixed in advance. It may have a value. FIG. 3 of the present embodiment shows an example in which the purgeable temperature ht1 of the hot runner 31 is set higher than the purgeable temperature vt1 of the heating cylinder 15, but it is possible to purge the heating cylinder 15 when setting to the same temperature. It is also assumed that the temperature vt1 is set higher.

Setting items during automatic purge for the hot runner include screw rotation speed, screw retracted position (injection stroke), back pressure, injection speed, injection pressure, and number of injections (number of purges). In the hot runner automatic purge mode, the purge in the heating cylinder also proceeds at the same time. However, in most cases, the optimum purge method differs between the purge in the hot runner and the purge in the heating cylinder. In the automatic purge for the hot runner, the injection speed, injection pressure, and number of injections (the number of purges) are important factors, and the screw rotation speed and back pressure are not important factors because it is desirable that the resin can be metered at an early stage.

In this embodiment, the setting value of the injection speed in the automatic purge mode for the hot runner is set to 50% of the setting value of the injection speed in the purge mode only in the heating cylinder. Note that the setting value of the injection speed in the automatic purge mode for the hot runner is preferably lower than the setting value of the injection speed in the purge mode only in the heating cylinder. More preferably, it is 20 to 80% of the set value. In addition, the injection speed in the automatic purge mode for the hot runner is desirably 20 mm / sec to 200 mm / sec as an example. In addition to the automatic purge mode for the hot runner, the operator also sets a preset value for the purge mode only in the heating cylinder. The automatic purge mode for the hot runner and the purge mode only in the heating cylinder are preferably set to different automatic modes when the use of the same resin is interrupted and when the resin is changed, respectively. Depending on the shape) and the type of resin, the automatic mode may be set and stored individually.

At the start of molding, when the temperature raising start is input to the injection molding machine 11, the temperature raising control of the heaters of the heating cylinder 15 and the nozzle 16 is started. Further, the temperature rise control of the heater 32 of the hot runner 31 is started simultaneously with the start of the temperature rise control of the heating cylinder 15 and the nozzle 16 or at an appropriately different timing. Although not limited to this, in the molding of an optical molded product such as a light guide plate using polycarbonate or the like, heat insulation control is performed at a constant temperature even when the molding is interrupted, and the heating cylinder 15, nozzle 16, Both the hot runner 31 and the hot runner 31 start to heat up from the heat retention temperatures ht0 and vt0. As shown in FIG. 3, in general, the heating cylinder 15 having a large heat capacity has a slower temperature rise time until the molding temperature vt2 is reached, and the temperature rise time until the hot runner 31 reaches the molding temperature ht2 is faster. In the present embodiment, the sensors used for determining whether to start the automatic purge mode are all the temperature sensors 33 in the hot runner 31 (conditions for checking the temperature rise of all the temperature sensors 33), and the heating cylinder 15 is in the front zone. A temperature sensor is used. However, the temperature sensor 33 used to start the determination of the automatic purge for the hot runner may be a single sensor, and their pattern is not limited.

When it is desired to execute the automatic purge mode for the hot runner, the operator first inputs the injection device advance button in the setting device 37 with the mode selection as the manual mode. Then, the hydraulic cylinder 21 of the nozzle touch device 17 is activated, the nozzle 16 of the injection device 13 moves forward toward the nozzle touch surface 24a of the fixed mold 24, and the nozzle 16 eventually comes into contact with the nozzle touch surface 24a. At that time, whether or not the molten resin can be injected toward the hot runner 31 of the mold by including a nozzle touch with an appropriate force is detected by detecting the pressure of the hydraulic sensor 23. The nozzle touch confirmation method is performed by another detection method such as the torque of the electric motor or the load cell value depending on the injection molding machine. The operator operates the hydraulic cylinder 28 in the manual mode and moves the movable platen 27 to the mold opening completion position.

Next, the operator inputs an automatic purge button of the setting device 37 at an appropriate timing of the injection molding machine 11 (s1). At this time, even if the operator inputs the automatic purge button without checking the state of each part of the injection molding machine 11, an overload state is not generated in the screw or the hot runner 31. When the automatic purge button is input, the arithmetic processing unit 39 of the control device 35 checks and determines whether the temperature vt of the temperature sensor of the heating cylinder 15 (heating cylinder temperature vt) is equal to or higher than the set purgeable temperature vt1. (S2). In this embodiment, the purgeable temperature vt1 at this time is set lower than the molding temperature vt2 of the heating cylinder 15 used at the time of molding and the cold start prevention release temperature vt3 that enables the operation of the screw. More specifically, although it differs depending on the resin, the temperature is set about 10 to 40 ° C. lower than the cold start prevention release temperature vt3. Accordingly, when the automatic purge button is input while the temperature of the heating cylinder 15 is rising and the heating cylinder temperature vt has not reached the purgeable temperature vt1 (s2 = N), an alarm is issued and the input of the automatic purge button is cancelled. (S3). When the heating cylinder temperature vt is equal to or higher than the purgeable temperature vt1 (s2 = Y), it is determined whether the nozzle touch is performed next by detecting the pressure of the hydraulic sensor 23 (s4). When the nozzle touch is not detected (s4 = N), the purge mode selection processing unit 40 of the arithmetic processing unit 39 selects the purge mode of the normal heating cylinder only, and the purge is performed in the automatic purge mode of the heating cylinder only. Be started. At this time, purging may be started when it is detected by a timer that a predetermined time has passed since the purgeable temperature vt1 or higher.

If a nozzle touch is detected (s4 = Y), it is next confirmed by a limit switch (not shown) or a sensor that detects the position of the movable plate 27 whether the position of the movable plate 27 is at the mold opening completion position ( s6). Alternatively, the position of the movable mold 26 may be confirmed at this time. When the position of the movable plate 27 or the movable mold 26 is not the mold opening completion position (s6 = N), the input of the automatic purge button is canceled (s3). Then, when the position of the movable platen 27 or the movable mold 26 is the mold opening completion position (s6 = Y), the arithmetic processing unit 39 determines that one of the start conditions of the hot runner automatic purge mode is satisfied. Is done. Next, it is confirmed whether or not the temperature ht (hot runner temperature ht) of the temperature sensor 33 of the hot runner 31 is equal to or higher than the purgeable temperature ht1 set in advance below the molding temperature ht2 (s7). When the hot runner temperature ht during temperature rise is lower than the purgeable temperature ht1 (s7 = N), the input of the automatic purge button is canceled (s3). When the hot runner temperature ht is equal to or higher than the purgeable temperature ht1 (s7 = Y), the arithmetic processing unit 39 determines that another one of the start conditions of the hot runner automatic purge mode is satisfied. In this case as well, purging may be started when the timer detects that a predetermined time has elapsed since the hot runner temperature ht became equal to or higher than the purgeable temperature ht1. Then, the hot runner automatic purge mode is enabled in a state where the purgeable temperature vt1 of the heating cylinder 15 and the purge heating temperature vt1 of the hot runner 31 are both satisfied under the AND condition (the time on the right side of A in FIG. 3). Since this time is a short time before reaching the normal cold prevention start cancellation temperature vt3, the setup work time can be shortened. Then, the control device 35 sends the set value of the hot runner automatic purge mode stored in the storage unit 41 as a command to each actuator of the injection device 13, and each actuator is activated to start the hot runner automatic purge (s8). . Then, the hot runner automatic purge mode is executed and terminated in accordance with preset conditions. In that case, it goes without saying that the valve gate is opened in the hot runner 31 having the valve gate. In the flowchart of FIG. 2, either the confirmation of the step s6 or the confirmation of the step s7 may be first.

In the purge control in the hot runner automatic purge mode, the screw is rotated in a state where the metering servo motor 19 is driven and a back pressure is applied or in a state of no back pressure. Then, the screw moves backward while rotating in the heating cylinder 15 and the molten resin is stored in front of the inner hole of the heating cylinder 15. Next, after the metering servo motor 19 is stopped, the injection servo motor 20 is driven, the screw is rapidly advanced, and the molten resin in front of the inner hole of the heating cylinder 15 is heated via the nozzle 16 to the hot of the fixed mold 24. Inject into the runner 31. As a result, the molten resin staying in the flow path of the hot runner 31 is discharged through the nozzle 34 of the hot runner 31 onto the bed (or on a dedicated receiving part) from the opened mold. In the present embodiment, the position of the movable platen 27 when the automatic purge button is input is at the mold opening completion position as one of the starting conditions of the hot purger automatic purge mode. It is not necessary to be in the mold opening completion position. That is, even if it is not at the mold opening completion position, it may be a distance that prevents the purged molten resin from adhering to the cavity surface of the movable mold 26. Furthermore, the purged molten resin is prevented from adhering to the cavity surface of the movable mold 26 by placing paper or a sheet between the cavity surface of the movable mold 26 or between the fixed mold 24 and the movable mold 26. You can also. Further, only during the screw rotation in the hot purger automatic purge mode, the valve gate of the hot runner 31 is closed and the fixed mold 24 and the movable mold 26 are closed so that the mold temperature does not decrease. May be.

Further, the set temperature of the purgeable temperature ht1 of the hot runner 31 is set to a predetermined temperature lower than the molding temperature ht2 in the present embodiment, but may be the molding temperature ht2. Alternatively, the automatic purge mode for the hot runner may be performed after raising the temperature further than the molding temperature ht2. In the case where the automatic purge for the hot runner is performed at a high temperature, the resin in the hot runner 31 is further melted, and replacement of the resin can be further expected. Further, when the hot runner automatic purge is performed at a temperature lower than the molding temperature ht2, the hot runner 31 can be purged at an early stage from the start of the temperature rise, and the setup work time can be shortened. Alternatively, the temperature of the hot runner 31 may be raised or lowered during the hot runner automatic purge mode.

When a controller dedicated to the hot runner is used, an interlock circuit is configured to determine whether the automatic purge mode for the hot runner can be started by transmitting the controller signal to the control device 35 of the injection molding machine. In addition, when the controller dedicated to the hot runner is independent of the control device 35 of the injection molding machine 11 and communication is not possible, the control device 35 cannot make the above determination. In this case, the operator can reliably raise the temperature of the hot runner 31. It is necessary to input the automatic purge button after monitoring, but this case is also included in the present invention.

In the above description, the control of the automatic purge mode for the hot runner at the start of molding is described. However, the automatic purge mode for the hot runner is controlled in the same procedure when the resin is changed. However, in many cases, the screw operation value and the number of times are set to be different. In addition, the resin change includes a case where the resin is changed to a replacement resin at the end of molding.

In the present invention, the order of the automatic purge mode only for the heating cylinder and the automatic purge mode for the hot runner may be performed first. That is, the operator inputs the automatic purge button with the injection device 13 retracted to perform the automatic purge mode only for the heating cylinder, and then advances the injection device 13 to touch the nozzle and then inputs the automatic purge button to enter the hot purge mode. The runner automatic purge mode may be performed, and conversely, after the hot runner automatic purge mode is performed, the injection device 13 may be retracted to perform the automatic purge mode only for the heating cylinder. Alternatively, only the automatic purge mode for the hot runner may be executed and the purge mode only in the heating cylinder may not be executed.

In the above embodiment, the setting device 37 of the injection molding machine 11 is provided with one automatic purge button, and when the automatic purge button is input, an appropriate purge mode is automatically selected and started. However, as another embodiment, the injection molding machine 11 has a plurality of automatic purge modes including an automatic purge mode for purging the hot runner 31, and the setting device 37 has a dedicated input for each automatic purge mode. A plurality of buttons may be provided. In that case, when the operator inputs an automatic purge button (dedicated button) for purging the hot runner, after performing steps s2 and s3 in the flowchart of FIG. 2, the nozzle touch is not performed in s4 ( In s4 = N), an error message is displayed without starting the automatic purge of only the heating cylinder of s5. For the steps after s5 when the automatic purge mode (dedicated button) for purging the hot runner is provided to perform the hot purge mode for the hot runner, a diagram of the case where the common automatic purge button of this embodiment is input. 2 is substantially the same as the step after s5 in the flowchart of FIG. 2, and the hot runner automatic purge mode is started when the conditions of steps 5 and s6 are satisfied. In another embodiment, when an automatic purge button (dedicated button) for purging only the heating cylinder is input and a nozzle touch is detected, an error message is displayed without starting automatic purge. To do. Thus, in another embodiment, the automatic purge mode of the hot runner 31 is started in conjunction with the nozzle touch detection of the injection device 13, so that even if the operator makes an input mistake, the automatic purge in the wrong mode is performed. Is prevented. In another embodiment, since an operator recognizes an automatic purge button (dedicated button) for purging the hot runner, even if the position of the movable platen 27 is in the mold-closed state, the mold is opened after the button is input. The hot runner automatic purge mode may be executed.

Furthermore, in the flowchart of the present embodiment, when the operator inputs an automatic purge button, the control device 35 side of the injection molding machine 11 selects the purge type and determines whether or not purge is possible. In the embodiment, the control device 35 may automatically perform all of the operations without inputting the automatic purge button by the operator. That is, in yet another embodiment, after the temperature rising start input (the operator starts the temperature rising start or the temperature rising start is started by the timer), the nozzle touch and the confirmation thereof are sequentially performed, and the position of the movable platen 27 or the movable mold 26 is changed. Confirmation, confirmation of the temperature of the heating cylinder 15 or nozzle 16 and confirmation of the temperature of the hot runner 31 are performed, and automatic purge of the hot runner (complete automatic purge) is performed in a state where all of these conditions are confirmed. This reduces the burden on the operator.

The present invention is not enumerated one by one, but is not limited to that of the above-described embodiment, and it goes without saying that those skilled in the art also apply modifications made in accordance with the spirit of the present invention. is there. The mold clamping device of the injection molding machine of the present invention may be a vertical mold clamping device that performs mold clamping in the vertical direction, and the injection device may also be provided in the vertical direction. Further, the injection device of the injection molding machine of the present invention may be a so-called Prepla (registered trademark) type injection device in which a plasticizing device incorporating a screw and a plunger device incorporating a plunger are separately provided and connected. Furthermore, the molding material used for the injection molding machine of the present invention is not limited, and may include a metal material, an inorganic material, or a fiber.

DESCRIPTION OF SYMBOLS 11 Injection molding machine 13 Injection apparatus 14 Clamping apparatus 15 Heating cylinder 16 Nozzle 23 Hydraulic sensor 24 Fixed mold 26 Movable mold 27 Movable board 31 Hot runner 33 Temperature sensor 35 Control apparatus 39 Arithmetic processing part 40 Purge mode selection processing part

Claims (4)

In an injection molding machine having a mold clamping device and an injection device capable of mounting a mold having a hot runner,
It has multiple automatic purge modes including an automatic purge mode for purging hot runners,
An injection molding machine comprising: a control device that selects or starts an automatic purge mode for purging the hot runner in conjunction with nozzle touch detection of the injection device from among the plurality of automatic purge modes. 2. The injection molding machine according to claim 1, wherein the position of the movable platen or the movable mold is a start condition of an automatic purge mode for purging the hot runner. The injection molding machine according to claim 1 or 2, wherein the detected temperature of the hot runner is a start condition of an automatic purge mode for purging the hot runner. In a control method of an injection molding machine provided with a mold clamping device and an injection device capable of mounting a mold having a hot runner,
It has multiple automatic purge modes including an automatic purge mode for purging hot runners,
An injection molding machine control method, wherein an injection speed in an automatic purge mode for purging the hot runner is lower than an injection speed in an automatic purge mode for purging only a heating cylinder.