JP2018164921A - Electric die casting machine and control method thereof - Google Patents

Abstract

The present invention provides an electric die casting machine and a control method thereof that can effectively suppress the generation of surge pressure. In the electric die casting machine 1, a control unit 30 performs a low-speed injection operation in which an injection plunger 20 is advanced at a low target speed V1, a high-speed injection operation in which the injection plunger 20 is advanced at a high target speed V2, and an injection plunger 20 The electric motors 11 and 12 are controlled to perform a pressure increasing operation to press forward. When the control unit 30 detects a decrease in the speed V of the injection plunger 20 during the high-speed injection operation, it controls the electric motor to advance the injection plunger 20 at a filling completion target speed V3 lower than the high-speed target speed V2. . [Selection diagram] Figure 2

Description

  The present invention relates to an electric die casting machine and a control method thereof.

  Patent Document 1 discloses a conventional electric die casting machine. The electric die casting machine rotates a screw shaft of a ball screw mechanism by a first injection electric motor that operates in a low speed injection process and a pressure increase process, and a second injection electric motor that operates in a high speed injection process. The injection plunger attached to the nut body screwed in is driven forward. In this electric die casting machine, two electric motors are controlled by separate control systems, and a clutch mechanism is provided to smoothly switch the driving force from one electric motor to the other electric motor.

  In addition to the electric die casting machine described above, one or a plurality of electric motors are controlled by one control system, and one screw shaft is driven by all the electric motors in a low speed injection process, a high speed injection process, a pressure increase process, and the like. Configuration is conceivable. In the electric die casting machine having this configuration, since the driving force is not switched between the electric motors, the configuration of the apparatus can be simplified by omitting the clutch mechanism.

JP 2012-187609 A

  In the electric die casting machine having the above-described configuration, when the injection plunger reaches a predetermined pressure increase switching position in the high-speed injection process, the electric motor switches to the pressure increase process for further pushing the injection plunger. In electric die-casting machines, the amount of molten metal to be scooped up with a ladle may vary, and if the amount of molten metal varies from cycle to cycle, the speed of the injection plunger can be switched depending on the position for variations in the amount of molten metal. In the case of switching control, the injection plunger is controlled so as to maintain the speed and the injection pressure rises, and in the subsequent pressure increase process, the rise of the pressure increase becomes steep, and surge pressure may be generated. It was.

  Then, an object of this invention is to provide the electric die-casting machine which can suppress generation | occurrence | production of surge pressure effectively, and its control method.

  In order to achieve the above object, an electric die casting machine according to an aspect of the present invention includes an injection plunger, a drive unit that moves the injection plunger in the front-rear direction, a control unit that controls the drive unit, and the injection plunger. An electric die casting machine having a speed detecting unit for detecting a speed, wherein the driving unit includes one electric motor controlled by the control unit or a plurality of electric motors controlled by the control unit. The control unit executes a low-speed injection operation for advancing the injection plunger at a low target speed, a high-speed injection operation for advancing the injection plunger at a high target speed, and a pressure increasing operation for pressing the injection plunger forward. And controlling the electric motor so that the control unit detects the speed of the injection plunger by the speed detection unit during the high-speed injection operation. When detecting the lower, and controls the electric motor so as to advance the injection plunger in the high-speed target speed lower than the filling completion target speed.

  In order to achieve the above object, an electric die casting machine according to another aspect of the present invention includes an injection plunger, a drive unit that moves the injection plunger in the front-rear direction, a control unit that controls the drive unit, and the injection An electric die casting machine having a pressure detecting unit for detecting an injection pressure of the plunger, wherein the driving unit is controlled by the control unit, or a plurality of electric motors controlled by the control unit. A low-speed injection operation for advancing the injection plunger at a low target speed, a high-speed injection operation for advancing the injection plunger at a high target speed, and a pressure-increasing operation for pressing the injection plunger forward The electric motor is controlled so that the injection plunger is further controlled by the pressure detection unit during the high-speed injection operation. Upon detection of a rise in injection pressure, and controls the electric motor so as to advance the injection plunger in the high-speed target speed lower than the filling completion target speed.

  In order to achieve the above object, an electric die casting machine according to another aspect of the present invention includes an injection plunger, a drive unit that moves the injection plunger in the front-rear direction, a control unit that controls the drive unit, and the injection An electric die casting machine having a speed detection unit for detecting the speed of the plunger and a pressure detection unit for detecting the injection pressure of the injection plunger, wherein the drive unit is controlled by the control unit. Alternatively, the control unit has a plurality of electric motors that are controlled in the same manner, and the control unit advances the injection plunger at a low target speed, and the injection unit advances the injection plunger at a high target speed. And the electric motor is controlled so as to execute a pressure increasing operation for pressing the injection plunger forward, and the control unit further includes the high-speed injection. When a decrease in the speed of the injection plunger is detected by the speed detection unit during operation, or when an increase in the injection pressure of the injection plunger is detected by the pressure detection unit during the high-speed injection operation, the injection plunger is The electric motor is controlled to advance at a filling completion target speed lower than the high speed target speed.

  In the present invention, when the speed of the injection plunger is smaller than a speed determination reference value, or when the inclination of the speed change of the injection plunger is smaller than a speed inclination determination reference value, It is preferable to detect a decrease in the speed of the injection plunger.

  In the present invention, when the injection pressure of the injection plunger becomes larger than the pressure determination reference value, or when the inclination of the injection pressure change of the injection plunger becomes larger than the pressure inclination determination reference value It is preferable to detect an increase in the injection pressure of the injection plunger.

  In order to achieve the above object, a method for controlling an electric die casting machine according to another aspect of the present invention includes an injection plunger, a drive unit that moves the injection plunger in the front-rear direction, and a control unit that controls the drive unit. A speed detecting unit that detects the speed of the injection plunger, and the driving unit includes one electric motor controlled by the control unit or a plurality of electric motors controlled by the control unit. A control method for a die casting machine, wherein the control unit controls the electric motor so as to execute a low-speed injection operation in which the injection plunger is advanced at a low target speed, and the injection plunger is advanced at a high target speed. A high-speed injection process in which the control unit controls the electric motor so as to execute a high-speed injection operation, and the injection plunger is pushed forward A pressure increasing step in which the control unit controls the electric motor so as to execute a pressure increasing operation, and when the speed detection unit detects a decrease in the speed of the injection plunger during the high speed injection operation, the injection The control unit controls the electric motor so that the plunger is advanced at a filling completion target speed lower than the high speed target speed.

  In order to achieve the above object, a method for controlling an electric die casting machine according to another aspect of the present invention includes an injection plunger, a drive unit that moves the injection plunger in the front-rear direction, and a control unit that controls the drive unit. A pressure detection unit that detects an injection pressure of the injection plunger, and the drive unit includes one electric motor controlled by the control unit or a plurality of electric motors controlled by the control unit. A method for controlling an electric die casting machine, wherein the control unit controls the electric motor so as to execute a low-speed injection operation in which the injection plunger is advanced at a low target speed, and the injection plunger is operated at a high target speed. A high-speed injection process in which the control unit controls the electric motor so as to execute a high-speed injection operation to move forward; and the injection plunger is pushed forward. A pressure-increasing step in which the control unit controls the electric motor so as to execute a pressure-increasing operation.When the pressure detecting unit detects a rise in the injection pressure of the injection plunger during the high-speed injection operation, The control unit controls the electric motor to advance the injection plunger at a filling completion target speed lower than the high speed target speed.

  In order to achieve the above object, a method for controlling an electric die casting machine according to another aspect of the present invention includes an injection plunger, a drive unit that moves the injection plunger in the front-rear direction, and a control unit that controls the drive unit. A speed detection unit that detects the speed of the injection plunger; and a pressure detection unit that detects an injection pressure of the injection plunger, wherein the drive unit is controlled by the control unit, A control method for an electric die casting machine having a plurality of electric motors controlled by the control unit, wherein the control unit controls the electric motor to execute a low-speed injection operation in which the injection plunger is advanced at a low target speed. A high-speed injection step in which the control unit controls the electric motor so as to execute a high-speed injection operation to advance the injection plunger at a high target speed. An injection step, and a pressure increasing step in which the control unit controls the electric motor so as to execute a pressure increasing operation for pressing the injection plunger forward, and the speed detection unit performs the pressure detection during the high speed injection operation. When a decrease in the speed of the injection plunger is detected, or when an increase in the injection pressure of the injection plunger is detected by the pressure detection unit during the high-speed injection operation, the injection plunger is set to a filling completion target lower than the high-speed target speed. The control unit controls the electric motor to advance at a speed.

  According to the present invention, when a decrease in the speed of the injection plunger is detected during a high-speed injection operation, or when an increase in the injection pressure of the injection plunger is detected, the injection plunger is advanced at a filling completion target speed lower than the high-speed target speed. Let As a result, even if the plunger position at which the mold cavity is filled differs due to variations in the amount of hot water supply, the injection plunger detects the decrease in the speed of the injection plunger due to the filling of the cavity or the increase in the injection pressure. The target speed of the plunger can be lowered. For this reason, it is possible to effectively suppress the generation of surge pressure by suppressing the rise of the pressure increase pressure in the pressure increase process.

It is a figure showing the schematic structure of the electric die-casting machine concerning one embodiment of the present invention. It is a graph explaining an example of operation | movement of the electric die-casting machine of FIG. 1 (speed monitoring switching operation). It is a graph explaining another example of operation | movement of the electric die-casting machine of FIG. 1 (pressure monitoring switching operation).

  Hereinafter, an electric die casting machine according to an embodiment of the present invention will be described with reference to FIGS.

  FIG. 1 is a diagram showing a schematic configuration of an electric die casting machine according to an embodiment of the present invention. As shown in FIG. 1, the electric die casting machine 1 of this embodiment includes a first electric motor 11, a second electric motor 12, a ball screw mechanism 13, a first power transmission mechanism 14, and a second power transmission mechanism. 15, an impact buffer mechanism 18, a linear motion body 19, an injection plunger 20, a load cell 21, a position sensor 22, and a control unit 30.

  The first electric motor 11 and the second electric motor 12 are constituted by electric servo motors having the same configuration, for example, and are controlled by a control signal transmitted from the control unit 30 described later. The first electric motor 11 and the second electric motor 12 have one as a master motor and the other as a slave motor, and the slave motor follows the master motor and rotates at the same speed in the same direction. That is, the 1st electric motor 11 and the 2nd electric motor 12 perform the same operation | movement mutually by being controlled by the same control system. In addition, in this embodiment, although it was the structure provided with two electric motors, it is not limited to this, One electric motor or three or more some controlled by one control system are the same It is good also as a structure provided with the electric motor.

  The ball screw mechanism 13 has a screw shaft 13a and a nut body 13b that is screwed to the screw shaft 13a via a ball (not shown). In the ball screw mechanism 13, the nut body 13b linearly moves in the axial direction of the screw shaft 13a when the screw shaft 13a is rotated about the shaft.

  The first power transmission mechanism 14 includes a first pulley 14a provided coaxially with the screw shaft 13a, and an endless belt-like timing belt 14b spanned between the first pulley 14a and the output pulley 11a of the first electric motor 11. And have. The first power transmission mechanism 14 transmits the rotation output of the first electric motor 11 to the screw shaft 13a, and rotates the screw shaft 13a around the shaft.

  Similarly to the first power transmission mechanism, the second power transmission mechanism 15 is also hung on the second pulley 15a provided coaxially with the screw shaft 13a, and the second pulley 15a and the output pulley 12a of the second electric motor 12. And an endless belt-like timing belt 15b. The second power transmission mechanism 15 transmits the rotational output of the second electric motor 12 to the screw shaft 13a, and rotates the screw shaft 13a around the shaft.

  The first power transmission mechanism 14 and the second power transmission mechanism 15 directly transmit the rotational outputs of the first electric motor 11 and the second electric motor 12 to the screw shaft 13a.

  The first electric motor 11, the second electric motor 12, the ball screw mechanism 13, the first power transmission mechanism 14, and the second power transmission mechanism 15 constitute a drive unit that moves the injection plunger 20 in the forward direction.

  The shock absorbing mechanism 18 includes a first member 18a, a second member 18b, and an elastic member 18c. The first member 18a is formed in an annular shape, and is fixedly attached to the nut body 13b with the nut body 13b inserted therethrough. The second member 18b is formed in an annular shape, and the nut body 13b is inserted therethrough, and is connected to the first member 18a with a connecting member such as a bolt (not shown) with the elastic member 18c interposed therebetween. The second member 18b is not fixed to the nut body 13b.

  The elastic member 18c is in a state where a compressive force equal to or slightly larger (for example, 1.05 to 1.1 times) than the molten metal pressure when switching from the high-speed injection process to the pressure increasing process is applied. It arrange | positions between the member 18a and the 2nd member 18b. Thereby, the elastic member 18c does not contract during the high-speed injection process, and a required injection pressure can be applied to the molten metal. When a large pressure is applied instantaneously, the elastic member 18c contracts and a large pressure is applied. It is possible to suppress the damage of the device due to.

  The linear motion body 19 is provided at a cylindrical main body portion 19a through which the screw shaft 13a is inserted, a wall portion 19b that closes a front end side end portion of the main body portion 19a, and a rear end side end portion of the main body portion 19a. And a flange portion 19c. The flange portion 19 c is fixedly attached to the second member 18 b of the shock absorbing mechanism 18.

  The injection plunger 20 is formed in a cylindrical shape, and one end is fixedly attached to the tip of the linear motion body 19. The injection plunger 20 is attached to the nut body 13b via the linear motion body 19 and the impact buffer mechanism 18, and is linearly moved along with the nut body 13b.

  The load cell 21 detects the pressure applied to the screw shaft 13 a and transmits a signal indicating this pressure to the control unit 30.

  The position sensor 22 is composed of, for example, a linear encoder, detects the position of the linear motion body 19 in the front-rear direction, and transmits a signal indicating the position of the linear motion body 19 to the control unit 30.

  The control unit 30 includes, for example, a microcomputer for an embedded device having a CPU, ROM, RAM, EEPROM, various I / O interfaces, and the like. The control unit 30 controls the entire electric die casting machine 1. In each process such as a mold clamping process, a low speed injection process, a high speed injection process, a pressure increasing process, a mold opening process, and a product taking process, the first electric motor 11 is controlled. And the operation of each drive device such as a mold opening / closing actuator and a product take-out actuator (not shown).

  The control unit 30 is connected to the first electric motor 11 and the second electric motor 12, and transmits control signals related to start / stop and rotational speed to these electric motors.

  The control unit 30 is connected to the load cell 21 and detects a pressure P (injection pressure) applied to the injection plunger 20 based on a signal from the load cell 21. The load cell 21 and the control unit 30 constitute a pressure detection unit. The control unit 30 is connected to the position sensor 22 and detects the forward / reverse position L and the speed V of the injection plunger 20 based on a signal from the position sensor 22. The position sensor 22 and the control unit 30 constitute a position detection unit and a speed detection unit.

  The control unit 30 performs feedback control (PID control) on the first electric motor 11 and the second electric motor 12 using the detected pressure P of the injection plunger 20, the forward / reverse position L, and the speed V. The control unit 30 detects the torques of the first electric motor 11 and the second electric motor 12 based on control signals transmitted to the first electric motor 11 and the second electric motor 12.

  Next, an example of a control method for the electric die casting machine 1 of the present embodiment described above will be described with reference to FIGS.

  FIG. 2 is a graph schematically showing a speed monitoring switching operation as an example of the operation of the electric die casting machine of FIG. 1, and FIG. 3 is a graph schematically showing a pressure monitoring switching operation as another example. . 2 and 3, the upper diagram shows the measured value of the velocity V of the injection plunger 20 and the pressure P (injection pressure) applied to the injection plunger 20, and the lower diagram shows the target velocity Vm of the injection plunger 20.

  The electric die casting machine 1 moves the injection plunger 20 forward to inject and fill the molten metal into the mold cavity with a low-speed injection operation and a high-speed injection operation. The injection plunger 20 is pushed forward with a higher thrust to fill the molten metal. The pressure increasing operation for increasing the pressure is sequentially executed. The electric die casting machine 1 monitors the speed V of the injection plunger 20 and the pressure P (injection pressure) applied to the injection plunger 20 by the control unit 30, and sets the target speed Vm of the injection plunger 20 based on these speed V and pressure P. Switch.

(Speed monitoring switching operation)
With reference to FIG. 2, the operation | movement which switches the target speed Vm based on the speed V of the injection plunger 20 is demonstrated.

  As shown in FIG. 2, in the low speed injection process, the control unit 30 starts the rotation operation of the first electric motor 11 and the second electric motor 12 as the low speed injection operation, and gradually increases the speed of the injection plunger 20. After that, it is moved forward at a constant low target speed V1 (for example, 0.2 m / sec). When the forward movement position of the injection plunger 20 reaches a predetermined high-speed switching position L1, the high-speed injection process is started.

  In the high-speed injection process, the control unit 30 increases the rotational speed of the first electric motor 11 and the second electric motor 12 to rapidly increase the speed of the injection plunger 20 as a high-speed injection operation, and then a constant high-speed target speed V2. It moves forward (for example, 2.0 m / sec).

  When the speed V of the injection plunger 20 becomes smaller than the speed determination reference value Vf (for example, 1.8 m / sec) before reaching the predetermined pressure increase switching position L2 in the high-speed injection process, the control unit 30 causes the injection plunger 20 is detected, the rotational speeds of the first electric motor 11 and the second electric motor 12 are decreased, and the injection plunger 20 is moved forward at the filling completion target speed V3 (for example, 0.5 m / sec). . When the slope of the change in the speed V of the injection plunger 20 (the amount of change per unit time) becomes smaller than a predetermined speed slope determination reference value, the control unit 30 detects a decrease in the speed V of the injection plunger 20. Also good.

  When the injection plunger 20 reaches the predetermined pressure increase switching position L2, the control unit 30 proceeds to the pressure increase process. The arrival at the pressure increase switching position L2 is detected by the position of the injection plunger 20, but besides this, the speed V of the injection plunger 20 at which the speed V of the injection plunger 20 is lower than the filling completion target speed V3. May be detected to reach the pressure increase switching position L2.

  In the pressure increasing process, the control unit 30 controls the first electric motor 11 and the second electric motor 12 as the pressure increasing operation so that the pressure P applied to the injection plunger becomes a pressure increase target pressure value Pm (for example, 60 MPa). . As a result, the control unit 30 increases the torque of the first electric motor 11 and the second electric motor 12, and accordingly, the pressure P applied to the injection plunger 20 increases to the pressure increase target pressure value Pm. The target pressure value Pm is held for a certain period. Then, the control part 30 cancels | releases pushing by the injection plunger 20, opens a metal mold | die, and takes out a molded article.

(Pressure monitoring switching operation)
With reference to FIG. 3, the operation | movement which switches the target speed Vm based on the pressure P (injection pressure) added to the injection plunger 20 is demonstrated. The low-speed injection process and the pressure-increasing process are the same as the above-described speed monitoring switching operation, and therefore only the high-speed injection process will be described here.

  As shown in FIG. 3, in the high-speed injection process, the control unit 30 increases the rotation speed of the first electric motor 11 and the second electric motor 12 and rapidly increases the speed of the injection plunger 20 as a high-speed injection operation. After that, it is moved forward at a constant high speed target speed V2 (for example, 2.0 m / sec).

  If the pressure P of the injection plunger 20 becomes greater than the pressure determination reference value Pf (for example, 10 MPa) before reaching the predetermined pressure increase switching position L2 in the high-speed injection process, the control unit 30 causes the pressure P of the injection plunger 20 to increase. Is detected, the rotational speeds of the first electric motor 11 and the second electric motor 12 are decreased, and the injection plunger 20 is moved forward at the filling completion target speed V3 (for example, 0.5 m / sec). When the slope of the change in pressure P of the injection plunger 20 (the amount of change per unit time) becomes larger than a predetermined pressure slope determination reference value, the control unit 30 detects an increase in the pressure P of the injection plunger 20. Also good. When the injection plunger 20 reaches the predetermined pressure increase switching position L2, the control unit 30 proceeds to the pressure increase process.

  As described above, the electric die casting machine 1 of the present embodiment switches the target speed Vm by detecting a decrease in the speed V of the injection plunger 20 or an increase in the pressure P during the high-speed injection operation.

  As described above, according to the electric die casting machine 1 of the present embodiment, when the decrease in the velocity V of the injection plunger 20 is detected during the high-speed injection operation or when the increase in the pressure P of the injection plunger 20 is detected. The injection plunger 20 is advanced at a filling completion target speed V3 lower than the high speed target speed V2. Thus, even if the mold cavity is filled before the injection plunger 20 reaches the pressure increase switching position L2, the speed V of the injection plunger 20 decreases due to the filling of the cavity, or the pressure P Can be detected and the target speed Vm of the injection plunger 20 can be lowered. For this reason, it is possible to effectively suppress the generation of surge pressure by suppressing the rise of the pressure increase pressure in the pressure increase process.

  In the embodiment described above, the control unit 30 is configured to perform both the speed monitoring switching operation and the pressure monitoring switching operation. However, the present invention is not limited to this, and the speed monitoring switching operation and the pressure monitoring switching operation are not limited thereto. A configuration in which only one of the operations is performed may be employed.

  Although the embodiments of the present invention have been described above, the present invention is not limited to these examples. Those in which those skilled in the art appropriately added, deleted, and changed the design of the above-described embodiments, and combinations of the features of the embodiments as appropriate, also include the present invention as long as they include the gist of the present invention. It is included in the scope of the invention.

  DESCRIPTION OF SYMBOLS 1 ... Electric die-casting machine, 11 ... 1st electric motor, 11a ... Output pulley, 12 ... 2nd electric motor, 12a ... Output pulley, 13 ... Ball screw mechanism, 13a ... Screw shaft, 13b ... Nut body, 14 ... 1st Power transmission mechanism, 14a ... first pulley, 14b ... timing belt, 15 ... second power transmission mechanism, 15a ... second pulley, 15b ... timing belt, 18 ... impact buffering mechanism, 18a ... first member, 18b ... second Member, 18c ... Elastic member, 19 ... Linear motion body, 19a ... Main body part, 19b ... Wall part, 19c ... Flange part, 20 ... Injection plunger, 21 ... Load cell, 22 ... Position sensor, 30 ... Control part, L ... Forward / backward movement Position, L1 ... high speed switching position, L2 ... pressure increase switching position, P ... pressure (injection pressure), V ... speed, V1 ... low speed target speed, V2 ... high speed target speed, V3 ... filling completion target speed Vf ... speed determination reference value, Pf ... pressure determination reference value, Pm ... pressure increase target pressure value

Claims (8)

An electric die casting machine having an injection plunger, a drive unit that moves the injection plunger in the front-rear direction, a control unit that controls the drive unit, and a speed detection unit that detects the speed of the injection plunger,
The drive unit has one electric motor controlled by the control unit or a plurality of electric motors controlled by the control unit,
The control unit performs a low-speed injection operation for advancing the injection plunger at a low target speed, a high-speed injection operation for advancing the injection plunger at a high target speed, and a pressure increasing operation for pressing the injection plunger forward. To control the electric motor,
Further, when the control unit detects a decrease in the speed of the injection plunger by the speed detection unit during the high-speed injection operation, the electric motor is driven to advance the injection plunger at a filling completion target speed lower than the high-speed target speed. An electric die casting machine characterized by controlling a motor. An electric die casting machine having an injection plunger, a drive unit that moves the injection plunger in the front-rear direction, a control unit that controls the drive unit, and a pressure detection unit that detects an injection pressure of the injection plunger,
The drive unit has one electric motor controlled by the control unit or a plurality of electric motors controlled by the control unit,
The control unit performs a low-speed injection operation for advancing the injection plunger at a low target speed, a high-speed injection operation for advancing the injection plunger at a high target speed, and a pressure increasing operation for pressing the injection plunger forward. To control the electric motor,
Further, when the control unit detects an increase in the injection pressure of the injection plunger by the pressure detection unit during the high-speed injection operation, the control unit advances the injection plunger at a filling completion target speed lower than the high-speed target speed. An electric die-casting machine that controls an electric motor. An injection plunger, a drive unit that moves the injection plunger in the front-rear direction, a control unit that controls the drive unit, a speed detection unit that detects the speed of the injection plunger, and a pressure that detects the injection pressure of the injection plunger An electric die casting machine having a detection unit,
The drive unit has one electric motor controlled by the control unit or a plurality of electric motors controlled by the control unit,
The control unit performs a low-speed injection operation for advancing the injection plunger at a low target speed, a high-speed injection operation for advancing the injection plunger at a high target speed, and a pressure increasing operation for pressing the injection plunger forward. To control the electric motor,
Further, when the control unit detects a decrease in the speed of the injection plunger by the speed detection unit during the high-speed injection operation, or when the pressure detection unit increases the injection pressure of the injection plunger during the high-speed injection operation When the motor is detected, the electric motor is controlled so that the injection plunger is advanced at a filling completion target speed lower than the high speed target speed.   When the speed of the injection plunger is smaller than a speed determination reference value, or when the inclination of the speed change of the injection plunger is smaller than a speed inclination determination reference value, the speed detection unit detects the speed of the injection plunger. The electric die-casting machine according to claim 1 or 3, wherein a drop is detected.   When the injection pressure of the injection plunger becomes greater than the pressure determination reference value, or when the inclination of the injection pressure change of the injection plunger becomes greater than the pressure inclination determination reference value, the pressure detection unit The electric die casting machine according to claim 2 or 3, wherein an increase in injection pressure is detected. An injection plunger; a drive unit that moves the injection plunger in the front-rear direction; a control unit that controls the drive unit; and a speed detection unit that detects a speed of the injection plunger, wherein the drive unit includes A control method of an electric die casting machine having one electric motor controlled by a control unit or a plurality of electric motors controlled by the control unit,
A low-speed injection step in which the control unit controls the electric motor so as to execute a low-speed injection operation of moving the injection plunger forward at a low target speed;
A high-speed injection step in which the control unit controls the electric motor so as to execute a high-speed injection operation of moving the injection plunger forward at a high target speed; and
A pressure increasing step in which the control unit controls the electric motor so as to perform a pressure increasing operation to press the injection plunger forward;
When the speed detection unit detects a decrease in the speed of the injection plunger during the high-speed injection operation, the control unit causes the electric motor to advance the injection plunger at a filling completion target speed lower than the high-speed target speed. A method for controlling an electric die casting machine, characterized by controlling. An injection plunger, a drive unit that moves the injection plunger in the front-rear direction, a control unit that controls the drive unit, and a pressure detection unit that detects an injection pressure of the injection plunger, and the drive unit includes: A method of controlling an electric die casting machine having one electric motor controlled by the control unit or a plurality of electric motors controlled by the control unit,
A low-speed injection step in which the control unit controls the electric motor so as to execute a low-speed injection operation of moving the injection plunger forward at a low target speed;
A high-speed injection step in which the control unit controls the electric motor so as to execute a high-speed injection operation of moving the injection plunger forward at a high target speed; and
A pressure increasing step in which the control unit controls the electric motor so as to perform a pressure increasing operation to press the injection plunger forward;
When the pressure detection unit detects an increase in the injection pressure of the injection plunger during the high-speed injection operation, the control unit causes the electric motor to advance the injection plunger at a filling completion target speed lower than the high-speed target speed. A method for controlling an electric die casting machine, characterized by controlling An injection plunger, a drive unit that moves the injection plunger in the front-rear direction, a control unit that controls the drive unit, a speed detection unit that detects the speed of the injection plunger, and a pressure that detects the injection pressure of the injection plunger And a control unit for an electric die casting machine having one electric motor controlled by the control unit or a plurality of electric motors controlled by the control unit.
A low-speed injection step in which the control unit controls the electric motor so as to execute a low-speed injection operation of moving the injection plunger forward at a low target speed;
A high-speed injection step in which the control unit controls the electric motor so as to execute a high-speed injection operation of moving the injection plunger forward at a high target speed; and
A pressure increasing step in which the control unit controls the electric motor so as to perform a pressure increasing operation to press the injection plunger forward;
When the speed detection unit detects a decrease in the speed of the injection plunger during the high-speed injection operation, or when the pressure detection unit detects a rise in the injection pressure of the injection plunger during the high-speed injection operation, The method of controlling an electric die casting machine, wherein the control unit controls the electric motor so that an injection plunger is advanced at a filling completion target speed lower than the high speed target speed.

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