JP2021194644A - Die cast machine - Google Patents

Abstract

To provide a die cast machine that can determine whether or not there is a possibility that a quality of a manufactured product may not satisfy a predetermined quality.SOLUTION: A die cast machine 1 includes: an ejection sleeve 3 in a cylindrical shape having an inlet port 3a into which molten metal is poured; a plunger 6, slidably fitted into the ejection sleeve 3, which is moved back and forth into the ejection sleeve 3 to eject the molten metal poured into the ejection sleeve 3; an ejection cylinder 7 that moves back and forth the plunger 6 into the ejection sleeve 3; and a control part 8 that obtains time elapsed until the plunger 6 is brought into a predetermined state and determines whether or not the time elapsed until the plunger is brought into the predetermined state is within a range of a reference value of preset time.SELECTED DRAWING: Figure 1

Description

The present invention relates to a die casting machine, and more particularly to a die casting machine provided with a plunger for injecting molten metal in a sleeve into a mold.

Conventionally, a die casting machine provided with a plunger for injecting molten metal in a sleeve into a mold has been known (see, for example, Patent Document 1).

The above-mentioned Patent Document 1 discloses a die casting machine that manufactures a cast product by molten metal. This die casting machine has an injection sleeve for supplying molten metal into the mold, an injection plunger provided in the injection sleeve for injecting the molten metal in the injection sleeve into the mold, and an injection for driving the injection plunger. It is equipped with a cylinder.

Here, although not specified in the above-mentioned patent document 1, in a general die-casting machine as described in the above-mentioned patent document 1, the injection speed and the like are set in advance. However, in the injection cylinder as described in Patent Document 1, when the injection plunger is driven due to deterioration over time, there is an error between the actual drive of the injection plunger and the drive of the preset injection plunger. May occur. If an error occurs in the drive of the injection plunger, the operation of the injection plunger will differ between the actual injection process and the preset injection process, and therefore the quality of the manufactured product will not meet the required predetermined quality. In some cases. Generally, in order to confirm the quality of manufactured products, quality inspection of some products randomly selected from multiple products is performed. If even one defective product is found in the quality inspection, all the products in the production lot containing the product are considered to be defective and may be discarded.

Japanese Unexamined Patent Publication No. 7-155926

However, the die casting machine described in Patent Document 1 is not configured to detect a difference in the operation of the injection plunger between the actual injection process and the preset injection process. Therefore, there is a problem that it is difficult to determine whether or not the quality of the manufactured product may not meet the predetermined quality.

The present invention has been made to solve the above-mentioned problems, and one object of the present invention is whether or not the quality of the manufactured product may not meet the predetermined quality. It is to provide a die casting machine capable of determination.

In order to achieve the above object, the die casting machine in one aspect of the present invention is slidably fitted in a tubular injection sleeve having a pouring port into which the molten metal is poured, and in the injection sleeve. A plunger that ejects the molten metal poured into the injection sleeve, a plunger drive mechanism that moves the plunger forward and backward into the injection sleeve, and a time until the plunger reaches a predetermined state are acquired. A control unit for determining whether or not the time until a predetermined state is reached is within the range of the reference value of the preset time is provided.

As described above, the die casting machine according to one aspect of the present invention includes a control unit for determining whether or not the time until the injection plunger reaches a predetermined state is within the range of the reference value of the preset time. .. As a result, if it is determined that the time until the injection plunger reaches a predetermined state is not within the range of the reference value of the preset time, the actual injection process and the preset injection process are performed. It can be determined that there is a difference in the operation of the plunger. As a result, it can be determined whether or not the quality of the manufactured product may not meet the predetermined quality.

In the die casting machine according to the above one aspect, preferably, the control unit acquires the time from when the signal for starting the injection of the plunger is output to the plunger drive mechanism until the plunger is in a predetermined state. It is configured to do. Here, the time from when the signal for starting the ejection of the plunger to the plunger drive mechanism is output to the actual state of the plunger is out of the preset reference value range. In this case, the operation of the plunger in the actual injection process is different from the operation of the plunger in the preset injection process. In such a case, the quality of the manufactured product may not meet the predetermined quality. Therefore, with the above configuration, the plunger is actually in the predetermined state by acquiring the time from when the signal for starting the ejection of the plunger is output until the plunger is in the predetermined state. It is possible to determine whether or not an abnormality has occurred by. As a result, it can be determined whether or not the quality of the manufactured product may not meet the predetermined quality.

In the die casting machine according to the above one aspect, preferably, the predetermined state is the state in which the plunger has started to move in response to the signal for starting the injection. Here, when the molten metal is supplied (poured) to the injection sleeve, the molten metal may undulate. Therefore, after a predetermined time has elapsed until the waviness of the molten metal subsides, the movement of the injection plunger is started by the plunger drive mechanism. However, the time from when the control unit outputs the signal for starting the ejection of the plunger to the plunger drive mechanism until the actual movement of the plunger is actually started is slower than the preset reference value. In that case, a part of the molten metal may harden in the injection sleeve. When a part of the molten metal is solidified in the injection sleeve, the molten metal containing the solidified molten metal is injected into the mold, so that the quality of the manufactured product is deteriorated. Therefore, with the above configuration, a signal for starting the ejection of the plunger is output to the plunger drive mechanism, and then a part of the molten metal in the injection sleeve based on the state where the plunger starts to move. Can be determined whether or not there is a possibility that the As a result, it can be easily determined whether or not the quality of the manufactured product may not meet the predetermined quality due to the solidification of a part of the molten metal in the injection sleeve. ..

In this case, preferably, the control unit acquires the time required for the plunger to move by a predetermined initial movement amount from the initial state in which the plunger is stopped as the time until the plunger starts to move. It is configured to do. With this configuration, it is easy to determine whether or not the state in which the plunger has started moving is normal by comparing the time until the plunger starts moving with the preset time. can do. As a result, by acquiring the time until the plunger starts moving, the quality of the manufactured product satisfies the predetermined quality due to the abnormal state in which the plunger starts moving. It can be easily determined whether or not there is a possibility.

In the die casting machine according to the above one aspect, preferably, the predetermined state is a state in which the plunger has moved to a predetermined position. With this configuration, the plunger is moved to the predetermined position by determining whether or not the time until the plunger is moved to the predetermined position is within the preset reference value range. It is possible to easily determine whether or not an abnormality has occurred in the control to be applied. As a result, the quality of the manufactured product is caused by an abnormality in the control for moving the plunger to the predetermined position by acquiring the time until the plunger is moved to the predetermined position. Can be easily determined whether or not the product may not meet the predetermined quality.

In this case, preferably, the control unit is configured to control the plunger drive mechanism so as to switch between a low-speed injection process for moving the plunger at a low speed and a high-speed injection process for moving the plunger at a high speed. The position of is the position where the low-speed injection process is switched to the high-speed injection process. Here, in the low-speed injection process, the filling rate of the molten metal in the injection sleeve is increased. Further, in the high-speed injection process, the molten metal is distributed to the mold. In the low-speed injection process, if the moving speed of the plunger is higher than the preset speed, the molten metal may undulate in the injection sleeve. Further, in the low-speed injection process, when the moving speed of the plunger is smaller than the preset speed, a part of the molten metal may solidify in the injection sleeve. If the low-speed injection process is switched to the high-speed forward process in such a state, the molten metal may be injected into the mold while entraining air or containing solidified molten metal, and thus the quality of the manufactured product. May decrease. Therefore, by setting the predetermined position to the position where the low-speed injection process is switched to the high-speed injection process, the time until the injection plunger reaches the position where the low-speed injection process is switched to the high-speed injection process is within a preset reference value range. By determining whether or not the injection process is within the range, it is possible to determine whether or not the low-speed injection process is normally performed. As a result, it can be easily determined whether or not the manufactured quality satisfies a predetermined quality depending on whether or not the low-speed injection process is normally performed.

In the die casting machine according to the above one aspect, preferably, the control unit discharges the manufactured product as a defective product when the time until the predetermined state is reached is out of the range of the reference value of the preset time. It is configured to control the operation. With such a configuration, it is possible to prevent defective products from being included in the production lot, and thus it is possible to prevent deterioration of the quality of the entire product lot.

In the die casting machine according to the above one aspect, preferably, a position detection unit for detecting the position of the plunger is further provided, and the control unit acquires the position of the plunger based on the detection result of the position detection unit to obtain the position of the plunger. It is configured to detect a predetermined state. With this configuration, for example, unlike the configuration in which the predetermined state of the plunger is detected based on the moving speed of the plunger, the speed at which the movement of the plunger is started is extremely low, and the plunger is configured based on the moving speed of the plunger. Even when it is difficult to detect whether or not is in a predetermined state, the predetermined state of the plunger can be detected by acquiring the position of the plunger. As a result, it is possible to accurately acquire the time until the plunger reaches a predetermined state.

In the die casting machine according to the above one aspect, preferably, the plunger drive mechanism includes a hydraulic pressure supply unit that supplies hydraulic pressure and a hydraulic pressure adjustment valve that adjusts the hydraulic pressure supplied from the hydraulic pressure supply unit, and the control unit is a hydraulic pressure adjustment valve. It is configured to acquire the time from the output of the signal for starting the injection of the plunger to the predetermined state of the plunger. With this configuration, it is determined whether or not the time until the plunger reaches a predetermined state is within the range of the reference value of the preset time, so that the hydraulic pressure adjusting valve has an abnormality such as deterioration. Can be easily determined whether or not is occurring.

In this case, preferably, a notification unit is further provided, and the control unit has a predetermined time from when the signal for starting the injection of the plunger is output to the hydraulic pressure adjusting valve until the plunger is in a predetermined state. When it is out of the range of the reference value for the set time, the notification unit is configured to give a notification to prompt the confirmation of the hydraulic pressure adjustment valve. With this configuration, if there is a possibility that the hydraulic pressure adjustment valve has an abnormality, a notification is given to prompt the confirmation of the hydraulic pressure adjustment valve, so that the user has an abnormality in the hydraulic pressure adjustment valve. It is easy to understand that there is a possibility.

According to the present invention, as described above, it is possible to determine whether or not the quality of the manufactured product may not meet the predetermined quality.

It is a figure which showed schematically the whole structure of the die casting machine by 1st Embodiment. It is a schematic diagram for demonstrating the injection process of the die casting machine by 1st Embodiment. It is a schematic graph for explaining the time lag until the plunger starts moving. It is a schematic graph for explaining the time lag until the plunger reaches the high speed switching position. It is a schematic graph for demonstrating the structure which the control part by 1st Embodiment acquires the time until the plunger starts moving and the time until it reaches a high-speed switching position. It is a flowchart for demonstrating the quality determination process of a product by the control unit of 1st Embodiment. It is a figure which showed schematically the whole structure of the die casting machine by 2nd Embodiment. It is a schematic diagram for demonstrating the structure which performs the notification prompting the confirmation of the hydraulic pressure adjustment valve by the control part by 2nd Embodiment. It is a flowchart for demonstrating the notification process which urges the confirmation of the hydraulic pressure adjustment valve by the control part of 2nd Embodiment.

Hereinafter, embodiments embodying the present invention will be described with reference to the drawings.

[First Embodiment]
The configuration of the die casting machine 1 according to the first embodiment will be described with reference to FIGS. 1 to 5. In the drawing, the Z direction is the vertical direction, the Z1 direction in the Z direction is the upward direction, and the Z2 direction in the Z direction is the downward direction. Further, the X direction is the horizontal direction, the X1 direction in the X direction is the forward direction of the plunger 6, which will be described later, and the X2 direction in the X direction is the backward direction of the plunger 6.

(Die-cast machine configuration)
As shown in FIG. 1, the die casting machine 1 is a horizontal machine in which the moving die 21 is moved in the horizontal direction. Further, the die casting machine 1 is a cold chamber type machine, and a liquid metal material is contained in a mold 2 (cavity C formed by the moving mold 21 and the fixed mold 22) attached to the die casting machine 1. It is configured to manufacture a die-cast product (molded product) by injecting the molten metal.

The die casting machine 1 includes a mold 2, an injection sleeve 3, a pouring mechanism 4, a lid mechanism 5, a plunger 6, an injection cylinder 7, a control unit 8, a position sensor 9, a display unit 10, and the display unit 10. An indicator lamp 11 and a storage unit 12 are provided. The injection cylinder 7 is an example of the "plunger drive mechanism" in the claims. Further, the position sensor 9 is an example of the "position detection unit" in the claims. Further, each of the display unit 10 and the indicator lamp 11 is an example of the "notification unit" in the claims.

The mold 2 is configured to form a cavity C (cavity portion) for molding a die-cast product (molded product).

Specifically, the mold 2 includes a moving mold 21 and a fixed mold 22. The fixed mold 22 is fixed to the fixed die plate 23. The moving mold 21 is attached to the moving die plate 24 so as to be movable in the direction (X direction) of contacting or separating from the fixed mold 22. The cavity C is formed by bringing the moving mold 21 into contact with the fixed mold 22.

The injection sleeve 3 has a tubular shape. Further, the injection sleeve 3 extends in the X direction. Further, the injection sleeve 3 is provided to supply the molten metal into the mold 2. Further, the injection sleeve 3 is configured to accommodate the plunger 6 so as to be movable in the X direction and to be able to pour molten metal.

Specifically, the injection sleeve 3 includes a pouring port 3a and a molten metal passage 3b. The pouring port 3a is provided for pouring the molten metal into the molten metal passage 3b by the pouring mechanism 4. The pouring port 3a penetrates the upper portion (Z1 direction side) of the injection sleeve 3 in the Z direction. The molten metal passage 3b is a through hole that penetrates the injection sleeve 3 in the X direction. The molten metal passage 3b communicates with the cavity C in the X1 direction.

The pouring mechanism 4 is configured to draw molten metal, which is a liquid metal material, from a holding furnace (not shown) and supply it to the injection sleeve 3 (pouring).

Specifically, the pouring mechanism 4 includes a radle 4a and an arm 4b. The radle 4a is configured to draw the molten metal, which is a liquid metal material, from the holding furnace. The arm 4b is configured to move the radle 4a to the pouring port 3a of the injection sleeve 3 and tilt the ladle 4a to pour the molten metal into the injection sleeve 3.

The lid mechanism 5 is configured to close the pouring port 3a after the molten metal is poured into the injection sleeve 3 by the pouring mechanism 4.

Specifically, the lid mechanism 5 includes a lid portion 5a and an arm 5b. The lid portion 5a has a shape that follows the shape of the pouring port 3a when viewed from the Z1 direction. The lid portion 5a is arranged at the tip end portion of the arm 5b. The arm 5b is configured to move the lid portion 5a to the pouring port 3a.

The plunger 6 includes a plunger tip 6a and a plunger rod 6b. The plunger tip 6a is slidably fitted in the injection sleeve 3. Further, the plunger rod 6b has a pillar shape extending along the X direction. A plunger tip 6a is connected to an end portion on the X1 direction side, which is one end portion of the plunger rod 6b. The plunger rod 6b slides the plunger tip 6a by moving back and forth in the injection sleeve 3. The plunger 6 is configured to be able to move forward and backward linearly in the injection sleeve 3 along the X direction, and is configured to inject the molten metal in the injection sleeve 3 into the mold 2.

The injection cylinder 7 is configured to move the plunger 6 back and forth within the injection sleeve 3. The injection cylinder 7 is a hydraulic cylinder (hydraulic cylinder) that operates by hydraulic pressure (hydraulic pressure). The injection cylinder 7 is connected to the hydraulic circuit 7a and is configured to be operated by the hydraulic circuit 7a. The detailed configuration of the injection cylinder 7 will be described later.

The control unit 8 is configured to control the drive of each unit of the die casting machine 1. Further, the control unit 8 acquires the time until the plunger 6 reaches the predetermined state, and determines whether or not the time until the plunger 6 reaches the predetermined state is within the range of the reference value of the preset time. .. The control unit 8 is electrically connected to each unit of the die casting machine 1. The control unit 8 includes, for example, a processor such as a CPU (Central Processing Unit) and a memory such as a ROM (Read Only Memory) and a RAM (Random Access Memory). The details of the configuration for determining whether or not the time until the control unit 8 reaches a predetermined state is within the range of the reference value of the preset time will be described later. Further, the reference value of time is set in advance by the mold 2 used, the injection sleeve 3 and the like, and is stored in the storage unit 12.

The position sensor 9 is configured to detect the position of the plunger 6. The position sensor 9 includes, for example, a magnetic or optical linear encoder, a laser length measuring instrument, and the like.

The display unit 10 includes a display medium such as a liquid crystal monitor and is configured to display information.

The indicator lamp 11 includes a light emitting unit such as a lamp, and is configured to notify the user by lighting or blinking.

The storage unit 12 includes a recording medium such as a flash memory and is configured to store information.

(Composition of injection cylinder)
As shown in FIG. 2, the injection cylinder 7 includes a piston 7b, a coupling 7c, a cylinder portion 7d, a head side chamber 7e which is a rear chamber, and a rod side chamber 7f which is a front chamber.

Further, the plunger rod 6b is connected to the piston 7b via the coupling 7c at the end portion on the X2 direction side. The piston 7b is provided so as to be able to reciprocate (advance and retreat) linearly in the cylinder portion 7d along the X direction. That is, the plunger rod 6b is moved forward and backward by moving the piston 7b forward and backward. The cylinder portion 7d has a cylinder shape extending along the X direction, and is provided so as to hold the piston 7b inside.

The head side chamber 7e is a chamber on the rear side (X2 direction side) of the cylinder portion 7d separated by the piston 7b. The rod side chamber 7f is a chamber on the front side (X1 direction side) of the cylinder portion 7d separated by the piston 7b. The head side chamber 7e and the rod side chamber 7f are configured so that hydraulic pressure is supplied or released. The hydraulic pressure of the head side chamber 7e and the hydraulic pressure of the rod side chamber 7f are detected by the pressure sensor 13a and the pressure sensor 13b, respectively. The position sensor 9 is configured to transmit the pressure detection result of the head side chamber 7e to the control unit 8. Similarly, the pressure sensor 13b is configured to transmit the pressure detection result of the rod side chamber 7f to the control unit 8. The pressure sensor 13a and the pressure sensor 13b include, for example, a hydraulic pressure sensor.

Further, the position sensor 9 is provided on the coupling 7c, and is configured to acquire the position of the plunger 6 by acquiring the position of the coupling 7c.

The hydraulic circuit 7a includes a hydraulic pressure supply unit 70, a hydraulic fluid storage unit 71, a pump 72, a first hydraulic pressure adjusting valve 73, a second hydraulic pressure adjusting valve 74, and a third hydraulic pressure adjusting valve 75. The first hydraulic pressure adjusting valve 73 and the second hydraulic pressure adjusting valve 74 are examples of the "hydraulic pressure adjusting valve" in the claims.

The hydraulic pressure supply unit 70 is mechanically connected to the head side chamber 7e by the first flow path 76. The hydraulic pressure supply unit 70 is configured to supply pressure to the head side chamber 7e. The hydraulic pressure supply unit 70 includes, for example, an accumulator.

Further, the first hydraulic pressure adjusting valve 73 is provided in the first flow path 76. The first hydraulic pressure adjusting valve 73 is configured to adjust the pressure supplied from the hydraulic pressure supply unit 70. Specifically, the hydraulic pressure adjusting valve 73 flows into the head side chamber 7e from the hydraulic pressure supply unit 70 via the first flow path 76 by adjusting the opening degree by the control unit 8. The pressure supplied to the head side chamber 7e is adjusted by adjusting the flow rate of the head chamber 7e. The first hydraulic pressure adjusting valve 73 includes, for example, a servo valve.

The hydraulic fluid storage unit 71 is mechanically connected to the rod side chamber 7f by the second flow path 77. The hydraulic fluid storage unit 71 is configured to store the hydraulic fluid discharged from the rod side chamber 7f. Further, the hydraulic fluid storage unit 71 is mechanically connected to the hydraulic pressure supply unit 70 by the third flow path 78. The hydraulic fluid storage unit 71 includes, for example, an oil tank.

Further, the second hydraulic pressure adjusting valve 74 is provided in the second flow path 77. The second hydraulic pressure adjusting valve 74 is configured to adjust the pressure of the rod side chamber 7f. Specifically, the second hydraulic pressure adjusting valve 74 adjusts the pressure of the rod side chamber 7f by adjusting the flow rate of the hydraulic fluid flowing out from the rod side chamber 7f by adjusting the opening degree by the control unit 8. It is configured as follows. The second hydraulic pressure adjusting valve 74 includes, for example, a servo valve.

Further, the pump 72 and the third hydraulic pressure adjusting valve 75 are provided in the third flow path 78. The pump 72 is configured to allow the hydraulic fluid stored in the hydraulic fluid storage unit 71 to flow into the hydraulic pressure supply unit 70. Further, the third hydraulic pressure adjusting valve 75 is controlled by the control unit 8 so as to suppress the backflow of the hydraulic fluid from the hydraulic pressure supply unit 70 to the pump 72. The third hydraulic pressure adjusting valve includes, for example, a check valve.

When the pilot pressure is not introduced to the hydraulic pressure supply unit 70, the control unit 8 introduces the pilot pressure to the hydraulic pressure supply unit 70 by opening the third hydraulic pressure adjusting valve 75 and operating the pump 72. do. Further, when the pilot pressure is introduced to the hydraulic pressure supply unit 70, the control unit 8 closes the third hydraulic pressure adjusting valve 75 and controls to stop the pump 72.

The injection cylinder 7 drives the plunger 6 to perform the injection process. The injection process includes an injection advance step and an injection return step. Note that FIG. 2 shows the injection advance process. The injection advancing step is a step of advancing the plunger 6 in the injection sleeve 3 (that is, moving it toward the X1 direction) and injecting the molten metal into the mold 2. Further, in the injection return step, the plunger 6 advanced in the injection advance step is moved backward in the injection sleeve 3 (that is, moved toward the X2 direction), and the plunger 6 is placed in a standby position for injection of the next molten metal. It is a process to move to. In addition, one injection process is also referred to as "one shot".

In the injection advance step, the injection cylinder 7 drives the plunger 6 to advance. Specifically, in the injection cylinder 7, under the control of the control unit 8, hydraulic pressure is supplied from the hydraulic pressure supply unit 70 to the head side chamber 7e, and the hydraulic pressure in the rod side chamber 7f is released, so that the piston 7b moves in the X1 direction. It is configured to be moved. As a result, the injection cylinder 7 is configured to transmit a driving force that moves in the X1 direction to the plunger 6 via the plunger rod 6b connected to the piston 7b. As a result, the injection cylinder 7 is configured to advance the plunger 6.

The injection forward step includes a low speed forward step and a high speed forward step. The control unit 8 is configured to control the injection cylinder 7 so as to switch between a low-speed injection process for moving the plunger 6 at a low speed and a high-speed injection process for moving the plunger 6 at a high speed. The low-speed injection step is a step of moving the plunger 6 with the first speed v1 (see FIG. 3) as the target speed. Further, the high-speed injection step is a step of moving the plunger 6 with the second speed v2 (see FIG. 3), which is a speed higher than the first speed v1, as the target speed. The position where the low-speed forward process is switched to the high-speed forward process (high-speed switching position Cp) is the position where the plunger tip 6a closes the pouring port 3a. Specifically, as shown in FIG. 2, the position where the surface 60 on the X1 direction side of the plunger tip 6a reaches the position of the wall surface 3c on the X1 direction side of the pouring port 3a is the position where the pouring port 3a is closed. .. The low-speed advance step is performed in order to increase the filling rate of the molten metal in the injection sleeve 3. Further, the high-speed forward step is performed to spread the molten metal in the mold 2 (cavity C).

The control unit 8 changes the moving speed of the plunger 6 by adjusting the opening degree of the first hydraulic pressure adjusting valve 73 and the opening degree of the second hydraulic pressure adjusting valve 74. Specifically, the opening degree of the first hydraulic pressure adjusting valve 73 and the opening degree of the second hydraulic pressure adjusting valve 74 when the movement of the plunger 6 is started and the low-speed injection process is performed, and the low-speed injection process is switched to the high-speed forward process. The opening degree of the first hydraulic pressure adjusting valve 73 and the opening degree of the second hydraulic pressure adjusting valve 74 are experimentally acquired in advance and stored in the storage unit 12.

When the signal 40 for starting the injection of the plunger 6 is output from the control unit 8 to the injection cylinder 7, the opening degree of the first hydraulic pressure adjusting valve 73 and the opening degree of the second hydraulic pressure adjusting valve 74 are stored in the storage unit. It is controlled so as to be the opening degree when the low-speed injection process stored in 12 is performed. When the plunger 6 reaches the high-speed switching position Cp, the control unit 8 sets the opening degree of the first hydraulic pressure adjusting valve 73 and the opening degree of the second hydraulic pressure adjusting valve 74 from the opening degree for the low-speed injection process at high speed. Controls to switch to the opening for the forward process.

If the first hydraulic pressure adjusting valve 73 and the second hydraulic pressure adjusting valve 74 are deteriorated or foreign matter is mixed in, the first hydraulic pressure adjusting valve 73 and the second hydraulic pressure adjusting valve 74 may not be normally controlled. Specifically, even if the control unit 8 controls the first hydraulic pressure adjusting valve 73 and the second hydraulic pressure adjusting valve 74 so that the opening degree is stored in the storage unit 12, the actual first hydraulic pressure adjusting valve The opening degree of 73 and the actual opening degree of the second hydraulic pressure adjusting valve 74 may be different from the opening degree stored in the storage unit 12. When the actual opening degree of the first hydraulic pressure adjusting valve 73 and the actual opening degree of the second hydraulic pressure adjusting valve 74 are different from the opening degree stored in the storage unit 12, the plunger 6 is in a predetermined state. The time until is different from the preset time. If the time until the plunger 6 reaches the predetermined state deviates from the preset time, the quality of the manufactured product may not meet the predetermined quality.

(Judgment of quality of manufactured products)
Therefore, in the first embodiment, the control unit 8 acquires the time until the plunger 6 reaches the predetermined state, and the time until the plunger 6 reaches the predetermined state is within the range of the reference value of the preset time. It is configured to determine whether or not. In the first embodiment, the control unit 8 acquires a time from when the signal 40 for starting the injection of the plunger 6 is output to the injection cylinder 7 until the plunger 6 is in a predetermined state. It is configured in.

(An example of the predetermined state of the plunger)
The predetermined state is a state in which the plunger 6 has started to move in response to the signal 40 for starting the ejection of the plunger 6. Manufactured when the time from when the control unit 8 outputs the signal 40 for starting the injection of the plunger 6 to the injection cylinder 7 until the plunger 6 starts moving occurs. The quality of the product may not meet the specified quality.

(Time lag until the plunger starts moving)
With reference to FIG. 3, an example in which the time until the plunger 6 starts moving is deviated due to deterioration of the first hydraulic pressure adjusting valve 73 or the like will be described. In the graph G1 shown in FIG. 3, the vertical axis is velocity and the horizontal axis is time.

In the graph G1 shown in FIG. 3, the speed change curve 30 shown by the solid line shows the change in the moving speed of the plunger 6 when the first hydraulic pressure adjusting valve 73 is not deteriorated. Further, in the graph G1, the speed change curve 31 shown by the broken line shows the change in the moving speed of the plunger 6 when multiplied by the time until the plunger 6 starts moving. The time lag until the plunger 6 starts moving occurs, for example, due to deterioration caused in the first hydraulic pressure adjusting valve 73 or the like.

If the first hydraulic pressure adjusting valve 73 has not deteriorated, as shown in the speed change curve 30, after the signal 40 for starting the injection of the plunger 6 is output and the plunger 6 starts moving. When the first hour t1 elapses, the low-speed injection process is switched to the high-speed forward process. That is, the plunger 6 reaches the first high-speed switching position Cp1 when the first time t1 elapses after the signal 40 for starting the ejection of the plunger 6 is output. The signal 40 for starting the injection of the plunger 6 is output after a predetermined time (delay time) has elapsed until the pouring of the molten metal is completed and the rippling of the molten metal in the injection sleeve 3 is settled. Further, the first high-speed switching position Cp1 is the high-speed switching position Cp when the first hydraulic pressure adjusting valve 73 is not deteriorated. Further, the graph G1 is shown so that the speed change curve 30 starts from the origin in order to make it easy to grasp the deviation of the start time of the movement of the plunger 6. Actually, it takes a predetermined time from the output of the signal 40 for starting the injection of the plunger 6 to the start of the movement of the plunger 6 due to the characteristics of the first hydraulic pressure adjusting valve 73.

On the other hand, when the first hydraulic pressure adjusting valve 73 is deteriorated or the like, as shown in the speed change curve 31, the signal for starting the injection of the plunger 6 is caused by the deterioration or the like of the first hydraulic pressure adjusting valve 73. There is a time lag between the output of 40 and the actual start of movement of the plunger 6. In the example shown in the graph G1, the plunger 6 actually starts moving after the second time t2 has elapsed from the output of the signal 40 for starting the ejection of the plunger 6. Therefore, as shown in the speed change curve 31, the start timing of the low-speed injection process is delayed by the second time t2 minutes from the start timing of the low-speed injection process. Further, the time to reach the second high-speed switching position Cp2 is also delayed by the second time t2 minutes from the first high-speed switching position Cp1. Therefore, the start timing of the high-speed injection process is also delayed by the second time t2 minutes. That is, when the first hydraulic pressure adjusting valve 73 is deteriorated, it is a second time t2 minutes longer than the first time t1 after the signal 40 for starting the injection of the plunger 6 is output. When t3 has elapsed for 3 hours, the plunger 6 reaches the second high-speed switching position Cp2.

(Other examples of the predetermined state of the plunger)
The predetermined state is a state in which the plunger 6 has moved to a predetermined position. Specifically, the predetermined position is a position where the low-speed injection process is switched to the high-speed injection process (high-speed switching position Cp (see FIG. 2)). If there is a time lag in reaching the position where the low-speed injection process is switched to the high-speed injection process, the quality of the manufactured product may not meet the predetermined quality.

(Time lag until the plunger reaches the high-speed switching position)
With reference to FIG. 4, an example in which the time until the plunger 6 reaches the high-speed switching position Cp is deviated due to deterioration of the second hydraulic pressure adjusting valve 74 or the like will be described. In the graph G2 shown in FIG. 4, the vertical axis is speed and the horizontal axis is time.

In the graph G2 shown in FIG. 4, the speed change curve 30 shown by the solid line shows the change in the moving speed of the plunger 6 when the second hydraulic pressure adjusting valve 74 is not deteriorated. Further, in the graph G2, the speed change curve 32 shown by the broken line shows the change in the moving speed of the plunger 6 when the time until the plunger 6 reaches the high-speed switching position Cp is shortened. The reason why the time required for the plunger 6 to reach the high-speed switching position Cp is shortened is considered to be, for example, a case where the second hydraulic pressure adjusting valve 74 is deteriorated and the plunger 6 pops out. Further, in the graph G2, the speed change curve 33 shown by the alternate long and short dash line shows the change in the moving speed of the plunger 6 when the time until the plunger 6 reaches the high-speed switching position Cp is delayed. The cause of the delay in the time until the plunger 6 reaches the high-speed switching position Cp is considered to be, for example, a case where the second hydraulic pressure adjusting valve 74 is deteriorated and the acceleration of the plunger 6 becomes smaller than a predetermined acceleration. .. The protrusion of the plunger 6 means that the pressure of the head side chamber 7e suddenly rises or the pressure of the rod side chamber 7f suddenly drops at the start of movement of the plunger 6, so that the plunger 6 has a predetermined acceleration. It is a phenomenon that moves slightly with the above acceleration.

In the first embodiment, the control unit 8 acquires the moving distance of the plunger 6 based on the moving speed and the moving time of the plunger 6. The control unit 8 determines whether or not the plunger 6 has reached the high-speed switching position Cp based on the acquired movement distance of the plunger 6. The high-speed switching position Cp is preset for each injection according to the mold 2, the injection sleeve 3, and the amount of the molten metal poured. That is, the control unit 8 determines whether or not the plunger 6 has reached the high-speed switching position Cp based on the moving distance of the plunger 6 acquired based on the moving speed and the moving time of the plunger 6, and the plunger 6 determines whether or not the plunger 6 has reached the high-speed switching position Cp. When it is determined that the Cp has been reached, the low-speed injection process is switched to the high-speed injection process. When the second hydraulic pressure adjusting valve 74 is not deteriorated, the predetermined speed of the plunger 6 is the first speed v1. When the second hydraulic pressure adjusting valve 74 is not deteriorated, the predetermined time of the plunger 6 is the time from the start of injection to the first time t1. Further, when the second hydraulic pressure adjusting valve 74 is not deteriorated, the high-speed switching position Cp is the first high-speed switching position Cp1.

When the second hydraulic pressure adjusting valve 74 is deteriorated and the plunger 6 pops out, a section Se having a first speed v1 or more is generated as shown in the speed change curve 32. Therefore, the moving speed of the plunger 6 is higher than that in the case where the second hydraulic pressure adjusting valve 74 is not deteriorated, so that the time required for moving the plunger 6 by a predetermined distance is shortened. That is, as shown in the graph G2, when the second hydraulic pressure adjusting valve 74 is deteriorated and the plunger 6 pops out, the position where the fourth time t4 has elapsed from the start of injection becomes the third high-speed switching position Cp3. ..

Further, when the acceleration of the plunger 6 is smaller than the predetermined acceleration due to deterioration of the second hydraulic pressure adjusting valve 74 or the like, as shown in the speed change curve 33, until the moving speed of the plunger 6 reaches the first speed v1. The time will be longer. Therefore, the time required for the plunger 6 to move a predetermined distance is also long. That is, as shown in the speed change curve 33, when the second hydraulic pressure adjusting valve 74 is deteriorated and the acceleration of the plunger 6 is smaller than the predetermined acceleration, the position where the fifth time t5 has elapsed from the start of injection is the fourth. The high-speed switching position is Cp4.

As shown in the graphs G1 and G2, the first hydraulic pressure adjusting valve 73 and the second hydraulic pressure adjusting valve 74 are deteriorated, and the time until the plunger 6 starts to move is deviated or the plunger 6 is moved. If there is a time lag until the high-speed switching position Cp is reached, the quality of the manufactured product may not meet the predetermined quality.

Specifically, the time from when the control unit 8 outputs the signal 40 for starting the injection of the plunger 6 to the injection cylinder 7 until the movement of the plunger 6 is actually started is set in advance. If it is slower than the reference value, a part of the molten metal may harden in the injection sleeve 3. Further, even when the high-speed switching position Cp shifts to the fourth high-speed switching position Cp4, a part of the molten metal may solidify in the injection sleeve 3. A product manufactured with a part of the molten metal solidified may be mixed with the solidified molten metal, and the quality of the manufactured product may not meet the predetermined quality.

Further, when the high-speed switching position Cp shifts to the third high-speed switching position Cp3, the moving speed of the plunger 6 in the low-speed injection process may be too fast, and the molten metal may undulate in the injection sleeve 3. If the molten metal undulates, it will be in a state of entraining air. When the molten metal is injected into the mold 2 with air entrained, gaps (layers containing air) may be formed in the manufactured product, and the quality of the manufactured product satisfies the predetermined quality. It may not be.

Immediately after the plunger 6 starts moving, the moving speed of the plunger 6 is very low. Therefore, when the speed sensor determines whether or not the plunger 6 has reached a predetermined state, it may not be possible to accurately determine the state in which the plunger 6 has started moving. Therefore, in the first embodiment, the control unit 8 is configured to detect a predetermined state of the plunger 6 by acquiring the position of the plunger 6 based on the detection result of the position sensor 9. In the first embodiment, the control unit 8 moves the plunger 6 from the initial state in which the plunger 6 is stopped to the sixth time t6 (see FIG. 5) required to move by a predetermined initial movement amount. Is configured to be acquired as the time until the start state is reached. In the first embodiment, the predetermined initial movement is, for example, a few millimeters. Preferably, the predetermined initial movement amount is, for example, about 4 mm to about 5 mm.

In the graph G3 shown in FIG. 5, the vertical axis is the signal strength and the horizontal axis is the time. Graph G3 is a graph showing the timing at which the control unit 8 outputs a signal 40 for starting the injection of the plunger 6 to the injection cylinder 7.

As shown in the graph G3, the control unit 8 outputs the signal 40 to the sixth time t6 until the timing tg1 when the plunger 6 starts moving, and the time until the plunger 6 starts moving. It is configured to get as.

Further, as shown in the graph G3, the control unit 8 sets the 7th time t7 from the output of the signal 40 to the timing tg2 when the plunger 6 reaches the high-speed switching position Cp to the high-speed switching position Cp. It is designed to be acquired as the time required to reach it. In FIG. 5, for convenience, the time length P between the timing tg1 when the plunger 6 starts moving and the timing tg2 when the plunger 6 reaches the high-speed switching position Cp is shown shorter than the actual time length. There is.

(Discharge of defective products)
In the first embodiment, the control unit 8 is manufactured when the time until a predetermined state is reached (sixth hour t6 and seventh hour t7) is outside the range of the reference value of the preset time. It is configured to control the discharge of the product as a defective product. In addition, every time a product is manufactured, the control unit 8 determines whether or not the time until a predetermined state is reached (sixth hour t6 and seventh hour t7) is within the range of the reference value of the preset time. judge.

With reference to FIG. 6, the process in which the control unit 8 determines the quality of the product will be described.

In step S1, the control unit 8 acquires the sixth time t6 until the plunger 6 starts moving.

In step S2, the control unit 8 determines whether or not the acquired sixth time t6 (see FIG. 5) is within the range of the preset reference value. When the acquired sixth time t6 is within the range of the reference value of the preset time, the process proceeds to step S3. If the acquired sixth time t6 is outside the range of the preset reference value, the process proceeds to step S6.

In step S3, the control unit 8 acquires the seventh time t7 (see FIG. 5) when the plunger 6 reaches the high-speed switching position Cp (see FIG. 2).

In step S4, if the acquired seventh time t7 is within the range of the reference value of the preset time, the process proceeds to step S5. If the acquired seventh time t7 is outside the range of the preset reference value, the process proceeds to step S6.

In step S5, the control unit 8 determines that the quality of the manufactured product is likely to satisfy a predetermined quality. Products for which it is determined that the quality of the manufactured product is likely to meet the predetermined quality is stored as a manufacturing lot. After that, the process ends.

Further, when the process proceeds from step S2 or step S4 to step S6, in step S6, the control unit 8 discharges the manufactured product as a defective product. That is, since it is highly possible that the quality of the manufactured product does not meet the predetermined quality, the product is discharged so as not to be stored as a production lot. After that, the process ends.

(Effect of the first embodiment)
The effect of the first embodiment will be described.

In the first embodiment, as described above, the die casting machine 1 is slidably fitted into the cylindrical injection sleeve 3 having the injection port 3a into which the molten metal is poured, and the injection sleeve 3 and is fitted into the injection sleeve 3. Until the plunger 6 that ejects the molten metal poured into the injection sleeve 3 and the injection cylinder 7 that moves the plunger 6 forward and backward into the injection sleeve 3 and the plunger 6 are in a predetermined state by being moved back and forth inward. The control unit 8 is provided with a control unit 8 for acquiring the time of the above and determining whether or not the time until the predetermined state is within the range of the reference value of the preset time. As a result, when it is determined that the time until the plunger 6 reaches a predetermined state is not within the range of the reference value of the preset time, the actual injection process and the preset injection process are performed. It can be determined that there is a difference in the operation of the plunger 6. As a result, it can be determined whether or not the quality of the manufactured product may not meet the predetermined quality.

Further, in the first embodiment, as described above, the control unit 8 outputs the signal 40 for starting the injection of the plunger 6 to the injection cylinder 7, and then the plunger 6 is in a predetermined state. It is configured to get the time up to. Here, the time from when the signal 40 for starting the ejection of the plunger 6 to the ejection cylinder 7 is output to the actual state of the plunger 6 is out of the preset reference value range. In the case of, the operation of the plunger 6 in the actual injection process is different from the operation of the plunger 6 in the preset injection process. In such a case, the quality of the manufactured product may not meet the predetermined quality. Therefore, by configuring as described above, the plunger 6 actually obtains the time from the output of the signal 40 for starting the ejection of the plunger 6 to the predetermined state of the plunger 6. It is possible to determine whether or not an abnormality has occurred by the time a predetermined state is reached. As a result, it can be determined whether or not the quality of the manufactured product may not meet the predetermined quality.

Further, in the first embodiment, as described above, the predetermined state is the state in which the plunger 6 has started to move in response to the signal 40 for starting the injection of the plunger 6. Here, when the molten metal is supplied (poured) to the injection sleeve 3, the molten metal may undulate. Therefore, after a predetermined time has elapsed until the waviness of the molten metal subsides, the injection cylinder 7 starts the movement of the plunger 6. However, the time from when the control unit 8 outputs the signal 40 for starting the injection of the plunger 6 to the injection cylinder 7 until the movement of the plunger 6 is actually started is a preset reference value. If it is slower than that, a part of the molten metal may harden in the injection sleeve 3. When a part of the molten metal is solidified in the injection sleeve 3, the molten metal containing the solidified molten metal is injected into the mold 2, so that the quality of the manufactured product is deteriorated. Therefore, with the above configuration, the signal 40 for starting the injection of the plunger 6 is output to the injection cylinder 7, and then the inside of the injection sleeve 3 is based on the state in which the plunger 6 has started to move. It is possible to determine whether or not a part of the molten metal may have solidified in. As a result, it can be easily determined that the quality of the manufactured product may not meet the predetermined quality due to the solidification of a part of the molten metal in the injection sleeve 3.

Further, in the first embodiment, as described above, the plunger 6 moves the plunger 6 from the initial state in which the plunger 6 is stopped to the time required for the plunger 6 to move by a predetermined initial movement amount. It is configured to be acquired as the time until the start state is reached. This makes it easy to determine whether or not the state in which the plunger 6 has started moving is normal by comparing the sixth time t6 until the plunger 6 starts moving with the preset time. It can be determined. As a result, by acquiring the sixth time t6 until the plunger 6 starts moving, the quality of the manufactured product is predetermined due to the abnormal state in which the plunger 6 starts moving. It can be easily determined that the quality of the above may not be satisfied.

Further, in the first embodiment, as described above, the predetermined state is the state in which the plunger 6 has moved to the predetermined position. As a result, the plunger 6 is moved to the predetermined position by determining whether or not the seventh time t7 until the plunger 6 is moved to the predetermined position is within the preset reference value range. It can be easily determined whether or not an abnormality has occurred in the movement control. As a result, by acquiring the 7th time t7 until the plunger 6 is moved to the predetermined position, the control for moving the plunger 6 to the predetermined position is abnormal. It can be easily determined that the quality of the product to be manufactured may not meet the predetermined quality.

Further, in the first embodiment, as described above, the control unit 8 sets the injection cylinder 7 so as to switch between the low-speed injection process of moving the plunger 6 at a low speed and the high-speed injection process of moving the plunger 6 at a high speed. It is configured to be controlled, and the predetermined position is a position where the low-speed injection process is switched to the high-speed injection process. Here, in the low-speed injection process, the filling rate of the molten metal in the injection sleeve 3 is increased. Further, in the high-speed injection process, the molten metal is distributed to the mold 2. In the low-speed injection process, if the moving speed of the plunger 6 is higher than a preset speed, the molten metal may undulate in the injection sleeve 3. Further, in the low-speed injection process, when the moving speed of the plunger 6 is smaller than the preset speed, a part of the molten metal may be solidified in the injection sleeve 3. If the low-speed injection process is switched to the high-speed forward process in such a state, the molten metal may be injected into the mold 2 in a state of entraining air or containing solidified molten metal. Quality may deteriorate. Therefore, by setting the predetermined position to the position where the low-speed injection process is switched to the high-speed injection process, the time until the plunger 6 reaches the position where the low-speed injection process is switched to the high-speed injection process (high-speed switching position Cp) is set in advance. By determining whether or not it is within the range of the set reference value, it is possible to determine whether or not the low-speed injection process is normally performed. As a result, it can be easily determined whether or not the manufactured quality satisfies a predetermined quality depending on whether or not the low-speed injection process is normally performed.

Further, in the first embodiment, as described above, when the time until the predetermined state is reached is out of the range of the reference value of the preset time, the manufactured product is defective. It is configured to control the discharge as. As a result, it is possible to prevent defective products from being included in the production lot, and thus it is possible to prevent deterioration of the quality of the entire product lot.

Further, in the first embodiment, as described above, the position sensor 9 for detecting the position of the plunger 6 is further provided, and the control unit 8 acquires the position of the plunger 6 based on the detection result of the position sensor 9. Is configured to detect a predetermined state of the plunger 6. As a result, for example, unlike the configuration in which a predetermined state of the plunger 6 is detected based on the moving speed of the plunger 6, the speed at which the movement of the plunger 6 is started is extremely small, and the plunger is based on the moving speed of the plunger 6. Even when it is difficult to detect whether or not 6 is in a predetermined state, the predetermined state of the plunger 6 can be detected by acquiring the position of the plunger 6. As a result, the time until the plunger 6 reaches a predetermined state can be accurately acquired.

Further, in the first embodiment, as described above, the injection cylinder 7 has a hydraulic pressure supply unit 70 for supplying hydraulic pressure, a first hydraulic pressure adjusting valve 73 for adjusting the hydraulic pressure supplied from the hydraulic pressure supply unit 70, and a second hydraulic pressure. Including the adjustment valve 74, the control unit 8 outputs a signal 40 for starting injection of the plunger 6 to the first hydraulic pressure adjustment valve 73 and the second hydraulic pressure adjustment valve 74, and then the plunger 6 determines. It is configured to get the time to state. As a result, the first hydraulic pressure adjusting valve 73 and the second hydraulic pressure adjusting valve 73 are determined by determining whether or not the time until the plunger 6 reaches a predetermined state is within the range of the reference value of the preset time. In 74, it can be easily determined whether or not an abnormality such as deterioration has occurred.

[Second Embodiment]
Next, the configuration of the die casting machine 101 in the second embodiment will be described with reference to FIGS. 7 and 8. Unlike the first embodiment in which the product is only discharged as a defective product when the quality of the manufactured product may not meet the predetermined quality, the die casting machine 101 in the second embodiment is manufactured. When there is a possibility that the quality of the product does not meet the specified quality, the product is discharged as a defective product and a notification prompting the confirmation of the first hydraulic control valve 73 and the second hydraulic control valve 74 is performed. It is configured. In the second embodiment, the same components as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

As shown in FIG. 7, the die casting machine 101 according to the second embodiment is different from the die casting machine 1 according to the first embodiment in that the control unit 18 is provided instead of the control unit 8.

The control unit 18 according to the second embodiment outputs a signal 40 for starting injection of the plunger 6 to the first hydraulic pressure adjusting valve 73 and the second hydraulic pressure adjusting valve 74, and then the plunger 6 is in a predetermined state. When the time until it becomes out of the range of the reference value of the preset time, the display unit 10 is notified to prompt the confirmation of the first hydraulic pressure adjusting valve 73 and the second hydraulic pressure adjusting valve 74. It is configured in.

Specifically, the control unit 18 outputs a signal 40 for starting injection of the plunger 6 to the first hydraulic pressure adjusting valve 73 and the second hydraulic pressure adjusting valve 74, and then the plunger 6 is in a predetermined state. When the time until it becomes (6th time t6 and 7th time t7) is out of the range of the reference value of the preset time, as shown in FIG. 8, the first hydraulic pressure adjustment is performed on the display unit 10. Notification is performed by displaying a message prompting confirmation of the valve 73 and the second hydraulic pressure adjusting valve 74. The range of the preset time reference value is the same as the range of the preset time reference value in the first embodiment.

Next, the notification process by the control unit 18 will be described with reference to FIG. 9. The same processing as that of the control unit 8 according to the first embodiment is designated by the same reference numerals, and detailed description thereof will be omitted.

In steps S1 and S2, the control unit 18 determines that the sixth time t6 is within the preset reference value range, and in steps S3 and S4, the seventh time t7 is within the preset reference value range. If it is determined, the notification process is not performed.

When the sixth time t6 is determined to be out of the preset reference value range in step S2, or when the seventh time t7 is determined to be out of the preset reference value range in step S4. The process proceeds to step S7.

In step S7, the control unit 18 gives a notification prompting confirmation of the first hydraulic pressure adjusting valve 73 and the second hydraulic pressure adjusting valve 74. After that, the process ends.

The other configurations of the second embodiment are the same as the configurations of the first embodiment.

(Effect of the second embodiment)
The effect of the second embodiment will be described.

Further, in the second embodiment, as described above, the display unit 10 is further provided, and the control unit 18 is for starting the injection of the plunger 6 to the first hydraulic pressure adjusting valve 73 and the second hydraulic pressure adjusting valve 74. When the time from the output of the signal 40 to the predetermined state of the plunger 6 is out of the range of the reference value of the preset time, the display unit 10 displays the first hydraulic pressure adjusting valve 73 and the first hydraulic pressure adjusting valve 73. 2 It is configured to give a notification for prompting confirmation of the hydraulic pressure adjusting valve 74. As a result, when there is a possibility that an abnormality has occurred in the first hydraulic pressure adjusting valve 73 and the second hydraulic pressure adjusting valve 74, a notification for prompting confirmation of the first hydraulic pressure adjusting valve 73 and the second hydraulic pressure adjusting valve 74 is provided. Therefore, the user can easily grasp that the first hydraulic pressure adjusting valve 73 and the second hydraulic pressure adjusting valve 74 may have an abnormality.

The other effects of the second embodiment are the same as the effects of the first embodiment.

[Modification example]
It should be noted that the embodiments disclosed this time are exemplary in all respects and are not considered to be restrictive. The scope of the present invention is shown by the scope of claims rather than the description of the above-described embodiment, and further includes all modifications (modifications) within the meaning and scope equivalent to the scope of claims.

For example, in the first and second embodiments, an example in which the die casting machine 1 (101) is configured horizontally is shown, but the present invention is not limited to this. In the present invention, the die casting machine may be configured vertically.

Further, in the first and second embodiments, the control unit 8 (18) outputs a signal 40 for starting the injection of the plunger 6 to the injection cylinder 7 until the plunger 6 is in a predetermined state. Although an example of the configuration for acquiring the time (sixth time t6 and seventh time t7) of is shown, the present invention is not limited to this. For example, the control unit may acquire the time from the completion of pouring of the molten metal to the time when the plunger is in a predetermined state. Further, the control unit may acquire the time from the time when the pouring of the molten metal is completed and the predetermined time (delay time) until the ripples of the molten metal are settled to the time when the plunger is in the predetermined state.

Further, in the first and second embodiments, the plunger 6 determines the time required for the control unit 8 (18) to move from the initial state in which the plunger 6 is stopped by a predetermined initial movement amount. Although an example is shown in which the time until the movement is started (sixth time t6) is shown, the present invention is not limited to this. For example, if it is possible to obtain the speed at which the plunger starts to move, the control unit should acquire the time until the plunger starts moving based on the movement speed of the plunger. It may be configured.

Further, in the first and second embodiments, the predetermined state is a state in which the plunger 6 moves to the high-speed switching position Cp (the position where the low-speed injection process is switched to the high-speed forward process), and the control unit 8 (18) is used. , Although an example of the configuration for acquiring the time (7th time t7) until the plunger 6 reaches the high-speed switching position Cp is shown, the present invention is not limited to this. For example, the predetermined state may be a state in which the plunger moves to a predetermined position set by the user. When the predetermined state is a state in which the plunger moves to a predetermined position set by the user, the control unit may be configured to acquire the time until the plunger reaches the predetermined position set by the user. ..

Further, in the first and second embodiments, the time until the control unit 8 (18) reaches a predetermined state (sixth time t6 and seventh time t7) is out of the preset reference value range. In this case, an example of a configuration in which the manufactured product is discharged as a defective product is shown, but the present invention is not limited to this. For example, the control unit does not have to discharge the manufactured product as a defective product when the time until the predetermined state is reached is out of the preset reference value range. However, if a defective product is included in the production lot, the quality of the product in the production lot as a whole deteriorates, and if a defective product is found in the quality inspection, all the products contained in the production lot must be discarded. There is. Therefore, it is preferable that the control unit is configured to discharge the manufactured product as a defective product when the time until the predetermined state is reached is out of the preset reference value range.

Further, in the first and second embodiments, an example of the configuration in which the die casting machine 1 (101) is provided with the position sensor 9 is shown, but the present invention is not limited to this. For example, if the die casting machine is equipped with a speed sensor and is configured to detect the position of the plunger based on the moving speed and time of the plunger, the die casting machine may not be provided with the position sensor. However, the speed immediately after the plunger starts moving may be very small, and it may be difficult to obtain the speed by the speed sensor. Therefore, it is preferable that the die casting machine is provided with a position sensor.

Further, in the first and second embodiments, the time until the plunger 6 starts moving (sixth time t6) and the time until the plunger 6 reaches the high-speed switching position Cp by the control unit 8 (18). An example of a configuration for acquiring (7th time t7) and determining whether or not the 6th time t6 and the 7th time t7 are within the preset reference values is shown. Not limited to. For example, the control unit acquires at least one of the time until the plunger starts moving (6th time t6) and the time until the plunger reaches the high-speed switching position (7th time t7). It may be configured to determine whether or not it is within the range of the preset reference value. That is, the control unit does not have to acquire both the time until the plunger 6 starts moving (6th time t6) and the time until the plunger 6 reaches the high-speed switching position Cp (7th time t7). good.

Further, in the second embodiment, the control unit 18 is configured to display a message on the display unit 10 to notify the user to confirm the first hydraulic pressure adjustment valve 73 and the second hydraulic pressure adjustment valve 74. However, the present invention is not limited to this. For example, the control unit may be configured to give a notification prompting confirmation of the hydraulic pressure adjusting valve by turning on or blinking the indicator lamp 11.

Further, in the first embodiment, the control unit 8 only controls to discharge defective products, and in the second embodiment, the control unit 18 is a first hydraulic pressure adjusting valve 73 and a second hydraulic pressure adjusting valve 74. Although an example of a configuration in which only a notification prompting confirmation is performed is shown, the present invention is not limited to this. For example, the control unit may be configured to discharge defective products and give a notification prompting confirmation of the hydraulic pressure adjusting valve. That is, the control unit may be configured by combining the configuration of the control unit 8 according to the first embodiment and the configuration of the control unit 18 according to the second embodiment.

Further, in the first and second embodiments, for convenience of explanation, the processing operations of the control unit 8 (18) have been described using a flow-driven flowchart in which the processing operations are sequentially performed along the processing flow. Is not limited to this. In the present invention, the processing operation of the control unit may be performed by event-driven type (event-driven type) processing in which processing is executed in event units. In this case, it may be completely event-driven, or it may be a combination of event-driven and flow-driven.

1,101 Die casting machine 3 Injection sleeve 6 Injection plunger 8, 18 Control unit 9 Position sensor (position detection unit)
10 Display unit (notification unit)
11 Indicator light (notification unit)
40 Signal to start injection of plunger 73 1st hydraulic pressure adjustment valve (hydraulic pressure adjustment valve)
74 Second hydraulic pressure adjustment valve (hydraulic pressure adjustment valve)
Cp high-speed switching position (position to switch from low-speed injection process to high-speed forward process)

Claims (10)

A tubular injection sleeve with a pouring port into which the molten metal is poured,
A plunger that is slidably fitted in the injection sleeve and is moved back and forth into the injection sleeve to inject the molten metal poured into the injection sleeve.
A plunger drive mechanism that moves the plunger forward and backward into the injection sleeve,
It is provided with a control unit that acquires the time until the plunger reaches a predetermined state and determines whether or not the time until the plunger reaches a predetermined state is within the range of the reference value of the preset time. , Die casting machine. The control unit is configured to acquire a time from when a signal for starting the ejection of the plunger is output to the plunger drive mechanism until the plunger is in a predetermined state. The die casting machine according to claim 1. The die casting machine according to claim 1 or 2, wherein the predetermined state is a state in which the plunger has started to move in response to a signal for starting the ejection of the plunger. The control unit acquires the time required for the plunger to move by a predetermined initial movement amount from the initial state in which the plunger is stopped as the time until the plunger starts to move. The die casting machine according to claim 3, which is configured. The die casting machine according to claim 1 or 2, wherein the predetermined state is a state in which the plunger has moved to a predetermined position. The control unit is configured to control the plunger drive mechanism so as to switch between a low-speed injection process for moving the plunger at a low speed and a high-speed injection process for moving the plunger at a high speed.
The die casting machine according to claim 5, wherein the predetermined position is a position where the low-speed injection process is switched to the high-speed injection process. The control unit is configured to control the manufactured product to be discharged as a defective product when the time until the predetermined state is reached is out of the range of the reference value of the preset time. , The die casting machine according to any one of claims 1 to 6. Further equipped with a position detection unit that detects the position of the plunger,
Any of claims 1 to 7, wherein the control unit is configured to detect the predetermined state of the plunger by acquiring the position of the plunger based on the detection result of the position detection unit. The die casting machine described in item 1. The plunger drive mechanism includes a hydraulic pressure supply unit that supplies hydraulic pressure and a hydraulic pressure adjusting valve that adjusts the hydraulic pressure supplied from the hydraulic pressure supply unit.
The control unit is configured to acquire the time from when the signal for starting the injection of the plunger to the hydraulic pressure adjusting valve is output until the plunger is in the predetermined state. The die casting machine according to any one of claims 1 to 8. Equipped with a notification unit
The control unit outputs a signal for starting injection of the plunger to the hydraulic pressure adjusting valve, and the time until the plunger reaches the predetermined state is a reference value of a preset time. The die casting machine according to claim 9, wherein when the range is out of the range of the above, the notification unit is configured to give a notification for prompting confirmation of the hydraulic pressure adjusting valve.

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