JP2022159658A - Initialization method for casting apparatus - Google Patents

Abstract

To provide an initialization method for a die cast machine, which enables an injection filling operation to be performed at a high-accuracy injection speed and casting pressure from a first shot of cast forming, and which enables quality of a casting to be stabilized by a stable operation of the die cast machine.SOLUTION: An initialization method for a die cast machine of the present invention includes a normal operation mode and an initialization mode. In the initialization mode, correlation data on a detection signal of a position detection part and a travel speed of a forward/backward travel operation of a plunger is created; correction processing of control data preset in an injection control part is performed on the basis of the correlation data; and subsequently, the normal operation mode is enabled.SELECTED DRAWING: Figure 1

Description

The present invention relates to an initial setting method for a die casting machine that obtains a cast product by injection filling a mold cavity with molten metal.

In casting molding using a die casting machine using molten metal such as an aluminum alloy, the molten metal is supplied to the inside of the injection sleeve, and the molten metal is injected and filled into the mold cavity by forward movement of the plunger. Next, a holding pressure is applied to the molten metal in the mold cavity to compensate for solidification shrinkage of the molten metal due to cooling and solidification. After the molten metal is cooled and solidified in the mold cavity, it is removed from the mold cavity as a casting. At the same time, the plunger is retracted to supply the molten metal to the inside of the injection sleeve again and proceed to the preparation process for casting the next shot. This series of casting steps is repeated until the planned number of castings is obtained.

Injection filling of molten metal into the mold cavity and holding pressure are the most important molding processes that greatly affect the quality of castings. For example, if the forward movement of the plunger (referred to as injection speed) in the injection filling process is unstable, the molten metal in the injection sleeve undulates violently, causing air entrainment (void defects), molten metal wrinkles, and molten metal circulation problems. , Casting defects due to injection speed such as contamination of molten metal oxide (foreign matter) occur. In addition, if the pressure applied to the molten metal inside the injection sleeve and inside the mold cavity during the holding pressure process (both referred to as casting pressure) is unstable, casting burrs, poor circulation of molten metal, sink marks, poor transfer, blowholes, etc. Casting defects occur due to the casting pressure of

For that purpose, a die-casting machine that can control injection speed and casting pressure with high precision is required. For example, as shown in Patent Document 1, there has been proposed a die casting machine equipped with an injection device that controls the flow rate of hydraulic pressure to an injection cylinder using a spool-type control valve driven by a servomotor via a ball screw. . By using high-precision rotation control of the servo motor, high-precision hydraulic flow control is realized, which enables high-precision control of injection speed and casting pressure, and stabilizes casting quality.

In addition, in a die casting machine with a hydraulically driven injection device equipped with a servo valve as shown in Patent Document 2, based on the feedback of the injection position, initial command data including mold characteristics are created, and based on this An injection control method has been proposed that enables proper injection speed and its automatic adjustment. Set the target speed data for the injection filling operation in advance, record the command data and measured speed data during the actual injection filling operation, compare the target speed data and the measured speed data, calculate the correction value, and issue the command with this correction value. The data is corrected, and the injection and filling operation for the next shot is performed using the corrected command data. In this way, by performing the injection filling operation with the latest corrected command data, it is possible to stabilize the casting quality.

JP-A-10-58114 Japanese Patent Application Laid-Open No. 2001-314954

Here, the means disclosed in Patent Document 1 does not take into consideration changes and errors in the control accuracy of the injection speed and casting pressure due to changes in the operating environment. For example, a change in temperature changes the viscosity of the hydraulic pressure (working oil), and also changes the operating state of the hydraulic pressure, which affects the control accuracy of the injection speed and casting pressure. In addition, the oil pressure deteriorates with the period of use, and the operating state of the oil pressure changes in the same manner as the temperature changes. Furthermore, mechanical parts such as servo motors, ball screws, and spools inevitably change with age according to the period of use, and the operating conditions of the mechanical parts that greatly affect the control accuracy of injection speed and casting pressure also change.

On the other hand, the means shown in Patent Document 2 is said to be able to eliminate changes and errors in the control accuracy of the injection speed and casting pressure due to changes in the operating environment such as changes in oil temperature and aging. . However, since the measurement data used as the basis for calculating the correction amount was measured during the injection filling operation in an unadjusted state, there is a problem that the reliability of the calculated correction amount itself is low. left. Moreover, even if a highly accurate correction result is obtained by repeating the correction, there still remains the problem that casting defects may be mixed in the number of shots until the final result is obtained.

Therefore, the present invention is an initial setting of a die casting machine that can perform an injection filling operation with a highly accurate injection speed and casting pressure from the first shot of casting molding, and stabilize the quality of cast products by stable operation of the die casting machine. The purpose is to provide a method.

The initial setting method of the die casting machine of the present invention is a die casting machine in which molten metal is supplied to the inside of an injection sleeve, and the plunger moves forward and backward to inject and fill the mold cavity with the molten metal. , a servo valve for adjusting the amount of hydraulic pressure supplied to the injection cylinder, and an injection control section for controlling the forward and backward movement of the plunger by controlling the servo valve.
The servo valve consists of a servomotor, a ball screw mechanism that converts the rotational motion of the servomotor into linear motion, a spool that is connected to the ball screw mechanism and adjusts the flow rate of hydraulic pressure by moving forward and backward, and a position detector that detects the position of the spool. And prepare.
The injection control section has a normal operation mode and an initialization mode.
In the initial setting mode, the correlation data between the detection signal of the position detection unit and the moving speed of the forward and backward movement of the plunger is created, and based on the correlation data, the control data preset in the injection control unit is corrected. It is characterized by validating the normal operation mode.

In the die-casting machine initialization method of the present invention, it is preferable to substitute an encoder for detecting the rotational motion of the servomotor as the position detector.

In the die-casting machine initialization method of the present invention, the correlation data is preferably collected within the range from the measurement start point to the measurement end point set at the spool position.

In the die-casting machine initial setting method of the present invention, the correction process is performed when the difference between the correlation data and the control data is within a preset allowable range value, and the control data is set to the control command value for the normal operation mode. preferably.

Further, in the die-casting machine initial setting method of the present invention, when the difference between the correlation data and the control data exceeds a preset allowable range value, the correction process is performed so that the control data is adjusted to fall within the allowable range value. is corrected to newly create correction control data, and the correction control data is preferably used as the control command value for the normal operation mode.

Further, in the die casting machine initial setting method of the present invention, it is preferable that the correction process uses the correlation data as the control command value for the normal operation mode.

According to the present invention, from the first shot of casting molding, it is possible to perform an injection filling operation with a highly accurate injection speed and casting pressure, and the stable operation of the die casting machine stabilizes the quality of the cast product. I can provide a setting method.

1 is a conceptual diagram of an injection device of a die casting machine according to an embodiment; FIG. FIG. 2 is a detailed view of the hydraulic drive and servo valve of FIG. 1; FIG. 2 is a detailed view of the injection control section of FIG. 1; It is a flow diagram of an initial setting method according to the embodiment. FIG. 4 shows an embodiment of the initial setting method, (a) is a waveform showing the spool position and plunger movement speed from the measurement start point to the measurement end point, and (b) is overwritten with control data and allowable range values. (c) is a waveform overwritten with correction data

Preferred embodiments for carrying out the present invention will be described below with reference to the drawings. In addition, the following embodiments do not limit the invention according to each claim. In addition, not all combinations of features described in the embodiments are essential for the solutions of the inventions according to the respective claims. In addition, in this embodiment, the scale and dimensions of each component may be exaggerated, and some components may be omitted.

[Die casting machine]
First, a die casting machine according to this embodiment will be described with reference to FIG. In the following description, the die-casting machine according to the present embodiment is based on a horizontal die-casting machine, but the die-casting machine is not limited to this.

The die casting machine 100 shown in FIG. 1 includes a fixed mold 1 supported by a fixed platen (not shown), a movable mold 3 supported by a movable platen (not shown) and capable of advancing and retreating with respect to the fixed platen 1, and an injection mold for injecting molten metal. The device 10 and an injection control section 40 for controlling the operation of the injection device 10 are provided. A casting is formed by injecting and filling molten metal such as an aluminum alloy into a mold cavity 5 formed by a fixed mold 1 and a movable mold 3 by an injection device 10 .

The injection device 10 includes an injection sleeve 11 into which molten metal is supplied, a plunger 13 that can move forward and backward inside the injection sleeve 11, a plunger rod 15 connected to the plunger 13, and a front and rear portion of the plunger 13 connected to the plunger rod 15. Hydraulic drive unit 20 for advancing operation and servo valve 30 for controlling hydraulic drive unit 20 in accordance with a control command value from injection control unit 40 are provided. Here, regarding the movement of the plunger 13, the movement toward the mold cavity 5 is defined as forward movement, the movement away from the mold cavity 5 is defined as backward movement, and the position at which the plunger 13 completes the backward movement is called standby position GE. and the position at which the plunger 13 completes forward movement is defined as injection completion position ZE. That is, the plunger 13 moves forward and backward within the range between the standby position GE and the injection completion position ZE. A position sensor 21 for detecting the position of the plunger 13 is provided in the hydraulic drive section 20 .

The injection sleeve 11 is a cylindrical body that is horizontally supported in a state of protruding rearward from a stationary platen (not shown). The axial direction of the injection sleeve 11 coincides with the forward and backward movement of the plunger 13 . The front side of the injection sleeve 11 passes through the fixed platen and is fastened to a predetermined position of the fixed mold 1 so as to communicate with the mold cavity 5 . A pouring port 17 is provided on the rear side of the injection sleeve 11 . While the plunger 13 is on standby at the standby position GE, molten metal is supplied to the inside of the injection sleeve 11 through the pouring port 17 from a hot water supply device or the like (not shown).
Further, the injection sleeve 11 and the plunger 13 are provided with a cooling mechanism (not shown) including a flow path through which a cooling medium such as cooling water flows, if necessary. Moreover, it is preferable to apply a lubricant to the sliding surface between the injection sleeve 11 and the plunger 13 in order to prevent wear and damage of the plunger 13, stabilize the sliding state, and suppress adhesion of molten metal residue.

Next, the hydraulic drive unit 20 and the servo valve 30 will be described with reference to FIG. Note that FIG. 2 is simplified to the extent that the present embodiment can be explained.
The hydraulic drive section 20 is composed of an injection cylinder 22 and an accumulator 28 . A piston rod 27 of the injection cylinder 22 is connected to the plunger 13 via a plunger rod 15 . A head-side hydraulic chamber 23 on the side of the piston head 26 of the injection cylinder 22 is connected to an accumulator 28 by a hydraulic pipe. 13 move forward. Alternatively, the pressing force of the plunger 13 is adjusted. This forward movement of the piston rod 27 is called the forward movement of the injection cylinder 22 and the forward speed of the piston rod 27 is called the injection speed of the injection cylinder 22 . Also, the pressing force of the plunger 13 is called the casting pressure of the injection cylinder 22 . By aligning the forward and backward motion directions of the injection cylinder 22 and the plunger 13, initial setting of the die casting machine 100, which will be described later, can be facilitated. The gas bottle 29 is for supplying pressurized gas to the accumulator 28 .

The servo valve 30 is composed of a valve body 31 , a servo motor 33 and a ball screw mechanism 35 . A slidable spool 313 is incorporated inside the valve body 31 , and by changing the position of this spool 313 , the forward and backward movement of the injection cylinder 22 can be controlled. Specifically, the rod-side hydraulic chamber 25 of the injection cylinder 22 on the piston rod 27 side and the hydraulic port 315 of the valve body 31 are connected by a hydraulic pipe, and the position of the spool 313 controls the hydraulic pressure of the rod-side hydraulic chamber 25 . By controlling the discharge amount of the injection cylinder 22, the forward movement of the injection cylinder 22 is performed (referred to as a meter-out control method). As a result, the forward motion of the plunger 13 connected to the plunger rod 27 of the injection cylinder 22 is controlled. Here, by aligning the forward and backward motion directions of the spool 313 and the injection cylinder 22, the forward and backward motion motion directions of the plunger 13, the injection cylinder 22, and the spool 313 can be aligned. Accurate control makes it possible to control the injection speed and casting pressure with high accuracy. In describing this embodiment, the forward movement of the spool 313 is defined as the + direction, and the backward movement of the spool 313 is defined as the - direction.

The rotation state of the servo valve 33 is detected by the encoder 37 and sent to the injection control section 40 . The injection control unit 40 receives the detection signal of the encoder 37 and performs feedback control of the rotation operation of the servomotor 33 so that there is no error with preset control data. The rotary motion of the feedback-controlled servomotor 33 is converted into linear motion by the ball screw mechanism 35 , and controls forward and backward movement of the spool 313 via the connecting rod 312 .

Here, using general mechanical specifications of the servomotor 33 and the encoder 37, a mechanism that can perform highly accurate feedback control will be described. The rotational motion of the servo motor 33 is the forward and backward motion of the spool 313 connected to the connecting rod 312 via the ball screw mechanism 35 . Here, it is assumed that the moving distance of the spool 313 changes by 25 mm with one rotation of the servomotor 33, for example. It is also assumed that the encoder 37 that transmits 20000 pulses per one rotation of the servomotor 33 is used. As a result, 10 pulses of the detection signal from the encoder 37 are detected as a movement amount of the spool 313 of 0.0125 mm. In practice, the rotation of the servo motor 33 is controlled by the single-digit detection pulse number of the encoder 37 . Based on this principle, the servomotor 33 can be controlled to rotate with extremely high accuracy, and as a result, the position of the spool 313 can be controlled with high accuracy on the order of 0.01 mm. control.

[Initial setting mode]
Next, an initialization mode for initializing the die casting machine according to this embodiment will be described with reference to FIG. The injection control section 40 shown in FIG. 3 has a normal operation mode 41 and an initial setting mode 43 . When the die casting machine 100 is started, the initial setting mode 43 is enabled and the normal operation mode 41 is disabled. Therefore, the initial setting mode 43 is first started to initialize the die casting machine 100, and the normal operation mode 41 is enabled only after the initial setting. That is, by initializing the die-casting machine 100 in the initial setting mode 43 before starting casting, changes in the injection speed and casting pressure of the die-casting machine 100 due to changes in the operating environment and other factors can be corrected. can. As a result, it is possible to reliably prevent the occurrence of casting failure due to malfunction during casting and mechanical damage due to runaway injection. Before starting the initial setting mode 43, it is preferable to determine the quality of the control device for controlling the injection speed and the casting pressure, the machine parts, and the like.

The initial setting mode 43 includes an input/output unit 431 for transmitting/receiving a detection signal from the encoder 37 and control data for the servo motor 33, a condition setting unit 433 for setting the conditions for rotating the servo motor 33, and a condition setting unit 433. A control unit 435 that controls the rotation operation of the servomotor 33 based on the set value, a processing unit 437 that performs processing such as correction and conversion of control data based on the detection signal of the encoder 37, and a processing result of the processing unit 437. A storage unit 438 for storing data and an alarm issuing unit 439 for issuing an alarm when an abnormality is confirmed based on the processing result of the processing unit 437 are provided. When the processing result of the processing unit 437 is normally performed, the initial setting mode 43 is terminated, the normal operation mode 41 is enabled, and casting is started. Also, the storage unit 438 is connected to the normal operation mode 41 .

Here, the condition setting unit 433 includes a rotation direction setting value that determines the rotation direction of the servomotor 33, a rotation speed setting value that determines the rotation speed, a rotation torque setting value that determines the rotation torque, and a rotation torque setting value that determines the rotation torque. A measurement start point S and a measurement end point E, which determine the range, are set. These set values are used to initialize the die casting machine.

[Initial setting method]
Next, a method for initializing the die casting machine using the initial setting mode according to this embodiment will be described with reference to FIGS. 4 and 5. FIG. When the die casting machine 100 is started, the initial setting mode 43 is enabled and the normal operation mode 41 is disabled. Therefore, the initial setting of the die casting machine 100 is always performed using the initial setting mode 43 first.

When the initial setting mode 43 is started, the servomotor 33 rotates from the measurement start point S to the measurement end point E based on the setting values set by the condition setting section 433, as shown in FIG. Here, the measurement start point S and measurement end point E are set at the position of the spool 313 of the servo valve 30 . This setting is set within the mechanical advance limit and retraction limit of the spool 313 . That is, in the casting molding performed after the initial setting mode 43, the injection speed and the casting pressure used as molding conditions are set within ranges. By doing so, it is possible to intensively improve the control accuracy of the injection speed and the casting pressure in accordance with the molding conditions of the casting molding, and it is possible to reliably realize the stabilization of the casting quality. For example, when the spool 313 is advanced in the + direction from the measurement start point S to the measurement end point E, the operation of injection filling is reproduced.

Here, the position of the spool 313 is measured using the position detector 39 provided on the valve body 31 . For the position detection unit 39, for example, a commercially available contact type displacement sensor such as an overcurrent loss type displacement sensor or a contact type displacement sensor or a non-contact type displacement sensor such as a laser displacement sensor may be used.
A detection signal from an encoder 37 that detects the rotation of the servomotor 33 that is connected to the spool 313 via the ball screw mechanism 35 may be used as a substitute for the position detector 39 of the spool 313 . In this case, as described above, the resolution of the servo motor 33 and the encoder 37 is very high, and the conversion accuracy of the ball screw mechanism 35 is also high. It is suitable as a substitute for It is preferable to organize the relationship between the movement distance of the spool 313 and the numerical value detected by the encoder 37 for one rotation of the servomotor 33 in advance. As a result, rotation control of the servomotor 33 and position detection of the spool 313 are simultaneously performed based on the detection signal of the encoder 37, and both position control of the spool 313 and measurement accuracy can be improved.

Returning to the description of FIG. When the position of the spool 313 detected by the encoder 37 reaches the measurement end point E, the rotational operation of the servo motor 33 is stopped, the measurement data collected by the input/output unit 431 is edited by the processing unit 437, and the storage unit 438 Save the result of the editing process to .
Here, the measurement data are measured values of the position of the spool 313 and the moving speed of the plunger 13 in the range from the measurement start point S to the measurement end point E. The editing process is to create correlation data DS of the moving speed of the plunger 13 corresponding to the position of the spool 313, as shown in FIG. FIG. 5 shows correlation data DS when the spool 313 moves forward from the measurement start point S to the measurement end point E in the + direction, and the moving speed of the plunger 13 moving forward indicates the injection speed. Although illustration is omitted, the correlation data DS when the spool 313 is retracted from the measurement start point S to the measurement end point E in the - direction indicates the retraction speed of the plunger 13 that is retracting. Also, FIG. 5 is simulated to the extent that the present embodiment can be understood.

The moving speed of the plunger 13 is calculated from the amount of movement of the plunger 13 and the elapsed time. As shown in FIG. 1 or 2, the movement amount of the plunger 13 is measured by a position sensor 21 attached to the hydraulic drive unit 20, for example, the movement amount of the piston head 26 or the piston rod 27 of the injection cylinder 22. In FIG. 1 or 2, the position sensor 21 is attached to the hydraulic drive unit 20, but the present invention is not limited to this. You can Since the temperature of the plunger tip 13 rises due to the high-temperature molten metal and it slides within the injection sleeve 11, there are restrictions on attaching the position sensor. Further, the position sensor 21 may be a commercially available contact type displacement sensor such as an overcurrent loss type displacement sensor or a contact type displacement sensor, or a non-contact type displacement sensor such as a laser displacement sensor.

Here, the description of the initial setting method of the die casting machine 100 using the initial setting mode 34 will focus on the injection speed and casting pressure in the injection filling process, which have the greatest effect on the casting quality. That is, as shown in FIG. 5, based on measurement data obtained by advancing the spool 313 from the measurement start point S to the measurement end point E in the positive direction, the movement speed (injection speed) of the plunger 13 in the forward direction edited and processed An initial setting method using the correlation data DS will be described. Regarding the initial setting method using other correlation data, the procedure is the same except that the selection conditions such as changing the moving direction of the spool 313, changing the moving range, using the casting pressure instead of the injection speed, etc. are different. Therefore, the explanation is omitted.

As shown in FIG. 5A, correlation data DS between the position of the spool 313 and the moving speed (injection speed) of the forward movement of the plunger 13 is obtained within the range of the spool 313 from the measurement start point S to the measurement end point E. , the processing unit 437 performs editing processing. After the editing process, as shown in FIG. 4, the processing unit 437 compares and determines the correlation data DS and the control data DC registered in advance in the injection control unit 40 . Here, the control data DC is control data initially set as machine specification values when the die casting machine 100 is designed and manufactured. By comparing and judging the control data DC and the correlation data DS, it is possible to quantify changes in the control accuracy of the injection speed and casting pressure due to changes in the usage environment and the extent of errors.

In the comparison determination of the processing unit 437, when the correlation data DS and the control data DC match (DS=DC), there is no change in control accuracy or error, and the control data DC registered in the injection control unit 40 is used. It is determined that the stable production of high-quality castings can be ensured even if casting is performed by After this determination, the initialization mode 43 ends and the normal operation mode 41 is enabled. In normal operation mode 41, casting is started using control data DC.

If the correlation data DS and the control data DC do not match (DS≠DC) in the comparison determination of the processing unit 437, the processing unit At 437 an acceptance decision is made. Here, the allowable range value K is calculated based on the actual measurement values of changes and errors in the control accuracy of the injection speed and casting pressure obtained from past casting results, etc., and the allowable range of the casting quality at that time. do. Note that a numerical value obtained by multiplying the calculation result by a safety factor may be set. Alternatively, a design reference value at the time of designing the die casting machine 100 or an actual value such as machining accuracy of machine parts at the time of manufacturing may be set. Further, the allowable determination is made by adding the allowable range value K to the correlation data DS to obtain the allowable range DS±K of the correlation data DS, and determining whether or not the control data DC falls within this allowable range.

Here, as shown in FIG. 5B, when it is determined that the control data DC is within the allowable range DS±K (indicated by the dashed line in the figure) (DC≦DS±K), for example, the past It is possible to obtain casting quality equivalent to casting molding, and it is judged as normal. After this normality determination, the initial setting mode 43 is terminated and the normal operation mode 41 is enabled. Also in this case, casting is started using the control data DC in the normal operation mode 41 .

As shown in FIG. 5(c), when it is determined that the control data DC is outside the permissible range DS±K (indicated by the dashed line in the figure) (DC>DS±K), the control data shown in FIG. As such, proceed to step 1 or step 2.

First, step 1 will be described. In step 1, the control data DC registered in the injection control unit 40 is corrected so as to be within the allowable range DS±K. Specifically, the control gain or the like of the injection control unit 40 is adjusted to create corrected control data DCH. take back. Next, the comparative determination and acceptance determination are performed as described above. This correction, comparison determination, and tolerance determination are repeated so as to be within the tolerance range DS±K. Finally, the corrected control data DCH, which is within the allowable range DS±K (DCH≦DS±K), is stored in the storage unit 438 as the corrected control data DH as shown in FIG. 5(c). Let After that, the initialization mode 43 is terminated, the normal operation mode 41 is enabled, and casting is started.
Here, the storage unit 438 is connected to the normal operation mode 41, and the normal operation mode 41 performs casting using the correction control data DH stored in the storage unit 438. FIG. In other words, by the initial setting method shown in step 1, even if there is a change or an error in the control accuracy of the injection speed or casting pressure due to changes in the usage environment, etc., the control data can be corrected to the latest state, and the casting and molding can be performed. Stable production of high-quality castings can be ensured from the first shot.

Next, step 2 will be described. For example, in situations where casting must be started as early as possible due to production planning, etc., or in situations where it is difficult to repeat correction and rework as in Step 1, we propose an initial setting method for Step 2.
In step 2, as shown in FIG. 5C, the control data DC registered in the injection control unit and the correlation data DS stored in the storage unit 438 are exchanged and converted. After conversion, the initialization mode 43 is terminated, the normal molding mode 41 is enabled, and casting molding is started. The normal molding mode 41 performs casting molding using the correlation data DS stored in the storage unit 438 .
As with the initial setting method of step 1, this initial setting method of step 2 keeps the control data up-to-date even if there is a change or error in the control accuracy of the injection speed or casting pressure due to changes in the usage environment. By correcting, it is possible to ensure stable production of high-quality castings from the first shot of casting. Furthermore, the man-hours for initial setting can be simplified, and the effect of improving productivity by shortening the time from starting the die casting machine 100 to starting casting can be obtained.

In this way, the initial setting mode 43 is used before the actual casting operation to perform injection filling of the servo motor 33, the encoder 37, the ball screw mechanism 35, the spool 313 of the servo valve 30, the hydraulic drive unit 20, and the plunger 13. Initial setting of the control circuit is performed. As a result, it is possible to quantify changes in the control accuracy of the injection filling operation and the extent of errors due to changes in the usage environment and the like. In addition, by adding control data correction and conversion processing, changes in control accuracy and errors can be corrected, and changes in the state of the die casting machine due to changes in the usage environment and aging can be reset, resulting in stable casting of the die casting machine. A molding operation can be ensured.

Although the preferred embodiments of the present invention have been described above, the technical scope of the present invention is not limited to the ranges described in the above-described embodiments. Various modifications or improvements can be added to the above embodiments.

1 Fixed Mold 3 Movable Mold 5 Mold Cavity 10 Injection Device 11 Injection Sleeve 13 Plunger 15 Plunger Rod 17 Spout 20 Hydraulic Actuator 21 Position Sensor 22 Injection Cylinder 30 Servo Valve 313 Spool 312 Connecting Rod 33 Servo Motor 35 Ball Screw Mechanism 37 Encoder 40 Injection control unit 41 Normal operation mode 43 Initial setting mode 100 Die casting machine S Measurement start point E Measurement end point DS Correlation data DC Control data DH Correction control data

Claims (6)

In a die casting machine in which molten metal is supplied to the inside of an injection sleeve, and the molten metal is injected and filled into a mold cavity by forward and backward movement of a plunger,
an injection cylinder that moves the plunger back and forth; a servo valve that adjusts the amount of hydraulic pressure supplied to the injection cylinder; and an injection control unit that controls the back and forth motion of the plunger by controlling the servo valve. prepared,
The servo valve includes a servomotor, a ball screw mechanism that converts the rotary motion of the servomotor into linear motion, a spool that is connected to the ball screw mechanism and adjusts the flow rate of hydraulic pressure by moving forward and backward, and detects the position of the spool. and a position detection unit for
The injection control unit has a normal operation mode and an initial setting mode,
In the initial setting mode, correlation data between the detection signal of the position detection section and the moving speed of the forward and backward movement of the plunger is created, and based on the correlation data, the control data preset in the injection control section is corrected. and then enabling the normal operation mode. 2. The initial setting method for a die casting machine according to claim 1, wherein said position detection unit is replaced by an encoder for detecting rotational movement of said servomotor. 3. The die casting machine initial setting method according to claim 1, wherein said correlation data is collected within a range from a measurement start point to a measurement end point set at said spool position. 2. From claim 1, wherein the correction process sets the control data to the control command value for the normal operation mode when the difference between the correlation data and the control data is within a preset allowable range. 4. A method for initializing a die casting machine according to any one of 3. In the correction process, when the difference between the correlation data and the control data exceeds a preset allowable range value, the control data is corrected so as to fall within the allowable range value to generate corrected control data. 4. The die casting machine initial setting method according to any one of claims 1 to 3, wherein the correction control data is newly created and used as the control command value for the normal operation mode. 4. The initial setting method for a die casting machine according to claim 1, wherein said correction processing uses said correlation data as a control command value for said normal operation mode.

Images