JPS6167557A - Method and device for controlling automatic pouring device for die casting machine - Google Patents

Abstract

PURPOSE:To improve product quality by controlling the conveying speed to maintain the specified time since ladling until pouring and lading the molten metal again if the speed exceeds a permissible speed to prevent overcooling in pouring in the automatic control of ladle operation for a die casting machine. CONSTITUTION:The level of the molten metal in a crucible 171 is detected 321 by a detector 160 and a ladle 50 is moved by a conveying motor 30 and a tilting motor 150 to ladle the molten metal and to stand by 333 above the furnace. A conveyance command thetac is emitted in synchronization with the completion of die clamping of the die casting machine 1 so that the ladle stands by in a pouring position 301. The high-speed pouring is executed by a pouring command thetaA. The time since ladling 327 of the molten metal by the ladle 50 until the high-speed pouring 303 is controlled by the conveyance speed V to maintain the specified pouring temp. The ladle 50 is descended 339 at a low speed from the standby 333 position above the furnace so as to ladle the molten metal again when the speed V exceeds a permissible speed Vmax. The overcooling in the pouring is prevented by such automatic control by which the molten metal is poured always at the correct molten metal temp. and the quality of the product is stabilized and improved.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention relates to a control method and control device for an automatic water supply device for a die-casting machine, and more specifically, the present invention relates to a method and a control device for controlling an automatic water supply device for a die-casting machine. The present invention relates to a control method and a control device for an automatic hot water supply device that pumps water (.) and pours it into an inlet of an injection sleeve of a die-casting machine.

[Conventional technology and problems]

- In a cold chamber type die-casting machine, hot water drawn in a ladle from a crucible in a heat-retaining furnace installed near the die-casting machine is automatically poured into the inlet of the injection sleeve of the die-casting machine. An automatic water heater is used. When performing hot water supply work using this type of automatic water heater, in order to improve the quality of die-cast products,
It is necessary to always draw a fixed amount of molten metal from the crucible with the ladle, and to transport and pour the ladle without causing hot water bathing, and to prevent the molten metal in the ladle from solidifying. , it is necessary to pour the hot water within a predetermined time.

Japanese Unexamined Patent Publication No. 58-181461 filed by the present applicant discloses an automatic hot water supply device for a die casting machine, a control method thereof, and a control device that can achieve the above-mentioned problems. This automatic hot water supply device includes a ladle and a ladle that transports the ladle along a predetermined transport path between a molten metal drawing position in a crucible in a heat-retaining furnace and a molten metal pouring position near an injection sleeve of a die-casting machine. The automatic hot water supply device is equipped with a conveying means and a ladle tilting means for tilting the ladle. Synchronously, after the mold clamping process of the die-casting machine is completed, the ladle is poured into the ladle at the pouring position near the injection sleeve of the die-casting TI, and then until the die-casting machine completes the injection process and product removal process. First, the ladle is made to scoop up a certain amount of molten metal in the crucible in the insulating furnace, and the ladle is made to wait at a predetermined standby position above the crucible, and then, in response to the start of the mold clamping process of the die casting machine, , a control device that starts transporting the ladle from a standby position to a pouring position.

According to this automatic hot water supply device, the ladle is raised at low speed from the /8 scooping position to the standby position above the crucible, and then the ladle is transported almost horizontally at high speed from the standby position to the pouring position. Because it can prevent intestinal wall rupture,
? G? It is possible to shorten the time from drawing up the L to pouring the molten metal.

On the other hand, this automatic hot water supply device is equipped with a means for making the molten metal drawing position follow the change in the scene inside the crucible, so that the amount of molten metal drawn can be kept accurately and constant in one pot. In this case, the I-broadcasting distance of the ladle changes as the molten metal pumping position changes, but in this automatic water heater, the ladle standby position changes in response to the change in the molten metal pumping position, and at low speed. Since the distance from the molten metal scooping position where the ladle moves to the ladle standby position is constant, the conveyance distance increases. However, since the ladle is transported at a high speed along this route, the increase in time required for transporting the ladle due to the increase in transport distance is kept to a minimum.

However, even with automatic hot water supply equipment for die casting machines that has taken such measures, when casting large die casting products or die casting products with complicated shapes, the die casting hta
The system may not be able to operate fully automatically. This is because dust occurs and the work to remove it occurs, and the operator's manual work is required to complete the spraying process. Since the time required for such manual firming and spraying operations varies, the interval between shots of the die-casting machine is not constant. For this reason, the waiting time of the ladle on the furnace after drawing up the molten metal varies. This means that the time from when the molten metal is drawn from the furnace to when it is poured varies. When such time fluctuations occur, the time for the ladle and the molten metal in the ladle to cool down changes, which changes the amount of molten metal that solidifies or becomes viscous and adheres to the ladle wall, resulting in fluctuations in the amount of poured metal. For this reason, even if the amount of hot water supplied, that is, the amount of molten metal drawn out, is controlled accurately, if the amount of poured hot water fluctuates, it becomes impossible to control the uniformity of the die-cast product.

According to experiments conducted by the present inventors, it has been confirmed that an 8 kg die-cast product has a variation of approximately 240 to 250 g (approximately 4% of the total weight).

Therefore, there is a need for a control method and a control device for an automatic hot water supply device for a die-casting machine that can improve and make the quality of die-cast products more uniform by making the amount of molten metal poured into the injection sleeve of the die-casting machine more uniform. has been done.

[One Means for Solving the Problems] As a means for solving the above problems, the present invention provides a ladle, and a position in which the ladle is connected to a molten metal drawing position in a crucible in a heat-retaining furnace and an injection injection point in a die-casting machine. The mold clamping process, In synchronization with the casting cycle of the die-casting machine, which repeats the injection process and the product removal process in sequence, after the mold-clamping process of the die-casting machine is completed, the process of pouring into the ladle is performed at a pouring position near the injection sleeve of the die-casting machine, and then, Until the die casting 17311 completes the injection process and the product removal process, the ladle is made to scoop up a certain amount of molten metal in the crucible in the heat-retaining furnace, and the ladle is placed on standby at a predetermined standby position above the crucible. and then, in a control method for an automatic hot water supply device for a die casting machine, the ladle starts transporting the ladle from a standby position to a pouring position in response to the start of a mold clamping process of the die casting machine, the ladle pumping up molten metal. The waiting time is adjusted according to the time required from when the ladle draws up the molten metal to when it starts the waiting position so that the time from when the ladle finishes pouring process is constant. A method for controlling an automatic hot water supply device for a die cast I-+2M is provided, the method comprising controlling an I shell feeding speed of the ladle from a position to a pouring position.

Further, as a means for solving the above-mentioned problems, the present invention provides a ladle and a position between the molten metal drawing position in the crucible in the insulating furnace and the molten metal pouring position near the injection sleeve of the die-casting machine. along a predetermined transport route (a ladle transport means for broadcasting;
The mold clamping process of the die casting machine is performed in synchronization with the casting cycle of the die casting machine, which sequentially repeats the mold clamping process, the injection process, and the product removal process, using an automatic hot water supply device equipped with a ladle tilting means for tilting the ladle. After completion, pour the metal into the ladle at the pouring position near the injection sleeve of the die-casting machine,
After that, until the die-casting machine completes the injection process and the product removal process, the ladle is made to scoop out a certain amount of molten metal from the crucible in the insulating furnace, and the ladle is placed in a predetermined waiting position above the crucible. In the control device for an automatic water heater for a die-casting machine, the control device causes the die-casting machine to standby at a die-casting machine, and then starts moving the ladle in one step from the standby position to the pouring position in response to the start of a mold-clamping process of the die-casting machine. The ladle is moved from the standby position to the deceleration position before the pouring position so that the time from the time when the ladle draws up the molten metal to the time when the ladle finishes the pouring process is constant. For a die-casting machine, comprising: a conveyance speed calculation section that calculates a conveyance speed; and a speed command section that sends a speed command signal to the ladle conveyance means according to the speed value calculated by the conveyance speed calculation section. Provides a control device for an automatic water heater.

[Effect]

According to the above means according to the present invention, the time from the time the ladle draws up the molten metal to the time when the ladle pours the molten metal so that the time from the time the ladle draws up the molten metal to the time when the ladle finishes the pouring process is constant. The I broadcasting speed of the ladle from the furnace standby position to the pouring position is controlled according to the time required to start the standby position, so that the amount of metal poured into the injection sleeve of the die-casting machine is made uniform. This makes it possible to improve and standardize the quality of die-cast products.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to the drawings.

First, the configuration of the automatic hot water supply device in the illustrated embodiment will be explained.

Referring to FIGS. 1 to 7, the automatic water heater is equipped with a fixed frame 10 that is attached to a mounting stand or an injection frame 11 of a die-casting machine. Servomotor)
A conveyance drive shaft 20 that is rotationally driven by 30 is rotatably supported. Reference numeral 40 indicates a motion transmission mechanism for reciprocating the ladle 50 along a predetermined conveyance path P in accordance with the rotation of the conveyance drive shaft 20. Motion transmission mechanism 4
0 includes a first arm 60 and a second arm 70.

Referring to FIG. 3, the base end of the first arm 60 is keyed to the cylindrical conveyance drive shaft 20, and the first arm 60
A counterweight 61 is attached to the base end of the 0 so that its position can be adjusted. A shaft 62 is provided at the tip of the first arm 60.
is rotatably attached, and the base end of the second arm 70 is fixed to the shaft 62 via a connecting member 71. Therefore, the second arm 70 is rotatable about the shaft 62. The ladle 50 is fixed to a shaft 72 rotatably attached to the tip of the second arm 70.

Referring to FIG. 4, a cylindrical shaft 12 coaxial with the transport drive shaft 20 is provided on the fixed frame 1'0 so as to be rotatable with respect to the transport drive shaft 20 and the fixed frame 10. A cheno wheel 80 is fixed to the cylindrical shaft 12, and a third
As shown in the figure, a cheno wheel 90 is fixed to the shaft 62. Both chain wheels 80 and 90 are connected by a chain wheel 81 so as to rotate in the same direction.

As shown in FIG. 4, a gear 21 is fixed to the conveyance drive shaft 20, and the gear 21 is connected to the output shaft 31 of the conveyance motor 30.
It meshes with a gear 32 fixed to. On the other hand, as shown in FIGS. 4 and 6, a link 100 is attached to the cylindrical shaft 12.
One end is fixed. A shaft 13 is rotatably attached to the fixed frame 10 vertically below the cylindrical shaft 12, and one end of a link 120 is fixed to the shaft 13. One end of the link 110 is rotatably connected to the other end of the link 120 via a shaft 121, and the other end of the link 110 is connected to the link 1 via the shaft 101.
It is rotatably connected to the tip of 00.

As shown in FIGS. 4 and 6, the shaft 121 has a link 1.
One end of 30 is rotatably attached, and link 1
The other end of the gear 30 is rotatably attached to a shaft 131 fixed to the gear 21. Since the float 21 rotates together with the first arm 60, the link 130 is substantially connected to the middle of the first arm 60.

As shown in FIG. 6, the end of the link 130 on the shaft 131 side is formed into a substantially U-shape, so even if the shaft 131 moves to the position indicated by the dashed line in FIG.
does not interfere with the transport drive shaft 20.

As shown in FIG. 3, there is a
A rolling drive shaft 140 is a rotatable output shaft, and a cheno wheel 141 is fixed to the tilting drive shaft 140. The second arm 70 has a shaft 1 extending in the axial direction of the shaft 62.
42 is rotatably supported. A cheno wheel 143 fixed to this shaft 142 is connected to a cheno wheel 141 by a cheno wheel 144. A cheno wheel 145 fixed to the shaft 142 is connected to a cheno wheel 146 fixed to the shaft 72 by a cheno wheel 147.

As shown in FIG. 4, a cheno wheel 148 is fixed to the tilting drive shaft 140. As shown in FIG. 5, a gear 15 is attached to a 15° output shaft 151 of a tilting motor (here, a DC servo motor) attached to a fixed frame 10.
2 is fixed, and a gear 1 meshing with a gear 152 is attached to a shaft 153 rotatably attached to a fixed frame lO.
54 is fixed. Cheno wheel 1 is attached to the shaft 153.
55 is fixed, and as shown in FIG.
48. Fixed frame 10 has Cheno 1
An idler 157 is attached to prevent the slack of the shaft 56.

The automatic hot water supply device having the above configuration is controlled by a control device so as to perform a predetermined hot water supply operation in synchronization with the casting cycle of the die cast 421, which sequentially repeats a mold clamping process, an injection process, and a product removal process. To explain this control device, in this embodiment, as shown in FIG. 70 and an electrode rod 162 inserted into the molten metal in the crucible 171 in the heat-retaining furnace 170. When the electrode rod 161 comes into contact with the surface of the molten metal in the crucible 171 in the heat-retaining furnace, the electrode rod 161
The relay 163 becomes electrically connected to the electrode rod 162 inserted into the molten metal in the molten metal 1, and the relay 163 is connected to the operation control section 180 shown in FIG.
A molten metal pumping position detection signal, that is, a scene detection signal θL
send.

As shown by the dotted chain line in FIG. 1, when the electrode rod 161 contacts the scene inside the crucible 171, a portion of the ladle 50 enters the molten metal, but the second arm 70 does not contact the molten metal. Therefore, damage to the second arm 70 is prevented. The position of the ladle 50 at this time is the molten metal drawing position P3, and when the ladle 50 reaches this molten metal drawing position P3, the lI of the ladle 50
The Q-feeding is stopped, and the ladle 50 enters a tilting operation to move the crucible 1.
Pump up the molten metal in 71.

As shown in FIG. 4, the fixed frame 10 has a motor shaft 3.
A rotary encoder 190 is attached as a conveyance position detection device that works in conjunction with the rotary encoder 1 to detect the position of the ladle 50 on the conveyance path P almost continuously. Further, as shown in FIG. 5, a rotary encoder 200 is attached to the fixed frame 10 as a tilting angle detecting device that works in conjunction with the shaft 153 to almost continuously detect the tilting angle of the ladle 50. There is. As shown in FIG. 8, the detection signals (digital signals) θT,
θR is sent to the operation control unit 180 via the input sofa circuit 191201.

As shown in FIG. 1, the crucible 170 is equipped with a furnace M172 that opens when replenishing molten metal and a Mitswitch 173 that detects the opening/closing state of the furnace lid 172. A detection signal from limit switch 173 is sent to operation control section 180.

(Left below) Referring to FIG. 8, the operation control unit 180 includes a sequencer,
It is composed of a microcomputer, etc., and the reference value setting devices 220 to 223 related to the one rotation control of the ladle 50 and the reference value setting devices 230 to 238 related to the conveyance control of the ladle 50 are connected to the operation control section 180. ing.

Next, a method of controlling the automatic water heater using the control device shown in FIG. 8 will be explained together with the hot water supply operation of the automatic water heater.

First, referring to FIGS. 1, 8, and 9, the low-speed forward motion of the ladle 50 is stopped at a pouring position P1 near the inlet 3 of the injection sleeve of the die-casting machine 1 (as shown in FIG. 9). Step 301). The pouring level i2E P t is the setting device 23
Set by 0. At this position, the ladle 50 waits for a pouring command θΔ from the die casting machine 1. The pouring command θA is issued when the die casting machine 1 is ready for pouring, for example, a limit switch (
(not shown) detects the mold clamping state of the die-casting machine 1, the data is sent to the operation control unit 180.

When this pouring command θA is sent to the operation control unit 180, the operation control unit 180 sends a reverse rotation command R2 and a high-speed rotation command R5 to the servo controller 158 of the tilting motor 150, and the ladle 50 Make one work. here,
The rotational speed of the tilting motor 150 can be switched in two stages, and a high-speed rotation command R5 is sent to the servo controller 1-roller 158 when pouring into the ladle 50 starts.

The servo controller 158 performs speed control by manually inputting a detection signal from a tacho generator 202 that detects the rotational speed of the tilting motor 150. In response to these reverse rotation 1 command R2 and high speed rotation command R5, the ladle 50 starts the pouring operation at the pouring position P1 (step 303 in FIG. 9). The pouring operation is performed by tilting the ladle 50. The tilting angle signal θR of the ladle 50 is sent from the rotary encoder 200 to the reversible counter 20.
1 and is sent to the operation control unit 180. When the ladle 50 tilts to a predetermined angle, the speed command signal is a low speed rotation command R.
4 (step 305 in FIG. 9), and when the rotation is further tilted to the next predetermined angle, the command switches to P and high speed rotation command R5 (step 307 in FIG. 9). In this way, when the ladle 50 reaches the pouring limit angle, a stop command R3 is sent to the servo controller 158, and the ladle 50 is stopped (step 309 in FIG. 9). At this time, the draining timer (not shown) is activated (step 311 in FIG. 9), and the ladle 50 drains the hot water at the pouring limit position until the time set by the draining time setting device 220 has elapsed (step 311 in FIG. 9). Step 313 in Figure 9).

When the draining time has elapsed, an injection command θB is sent from the operation control unit 180 to the control device (not shown) of the die-casting machine 1, and the die-casting machine 1 starts the injection operation. After that, the die casting machine 1 enters a mold opening process after completing the injection process, then a product removal process, then a mold cooling process, and then a deburring process and a spraying process on the mold surface. After completing the first spraying process, the mold clamping process begins.

On the other hand, when the easy cutting time has elapsed, the operation control unit 180 issues a reverse rotation command F to the servo controller 33 of the transport motor 30.
2 and high-speed return speed command F5 are sent, and the ladle 50 is moved along the transport path P to the speed switching position P2 above the crucible 171.
(Step 3 in Figure 9)
15-317) This speed is set by the return speed setting device 231. The servo controller 33 of the 111 feed motor 30 controls the rotation speed of the feed motor 30 by inputting a detection signal from the tacho generator 192 that detects the rotation speed of the feed motor 30 .

During the rapid retraction of the ladle 50, the ladle 50 is returned to the neutral angular position. The neutral angle of the ladle 50 is set by a setting device 221.

The initial position of the speed switching position P2 is set by the speed switching position initial value setting device 233. In addition, the speed switching position P2 in the second and subsequent hot water supply operations is determined by the position adjustment amount setting device 2.
It is shifted toward the furnace side by the set amount set at 32. This set amount corresponds to the amount of reduction in the surface area due to the molten metal in the crucible 171 being pumped out. The position of the ladle 50 when the hot water level is detected is determined by the signal θT sent from the rotary encoder 190 to the operation control unit 180 via the reversible counter 191.

When the ladle 50 reaches the speed switching position P2, the operation control unit 1
A low speed rotation command F4 is sent from 80 to the servo controller 33 of the transport motor 30, and the transfer motor 50 rotates the crucible 1 at low speed.
71 (step 319 in FIG. 9).

This speed is set by a low speed setting device 234.

As the ladle 50 descends, the electrode rod 1 of the hot water level detection device 160
61 comes into contact with the scene inside the crucible 171, a hot water level detection signal θL is sent from the relay 163 to the operation control unit 180, and a stop command F3 is sent from the operation control unit 180 to the servo controller 33 of the transport motor 30, so that the transport motor 30 stops. At this time, the ladle 50 reaches the scene detection position, that is, the molten metal scooping position P3 (step 321 in FIG. 9).

At the same time as the conveyance motor 30 stops, a normal rotation command R1 and a low speed rotation command R4 are sent to the servo controller 158 of the tilting motor 150, and the ladle 50 is rotated around the shaft 72 to the measuring angle position set by the measuring angle setting device 222. Tilt in the direction of lowering the bottom.

When the ladle 50 is tilted to the measuring angle position, a stop command R3 is sent to the servo controller 158, and the ladle 50 is stopped at the measuring angle position (step 323 in FIG. 9).

The ladle 50 is held at the 4th scooping position P3 until the time set by the first furnace time setting device 235 has elapsed (9th
Step 325 in the figure). The first in-furnace time setting device 235 sets the time during which the ladle 50 remains in the molten metal in the crucible 171 from the time when the electrode J8161 contacts the molten metal surface.

When the time set by the setting device 235 has elapsed, the servo controller 33 of the I-broadcast motor 30 is
A forward rotation command F1 and a low speed rotation command F4 are sent to the ladle 5.
0 starts a low speed rise from the molten metal drawing position P3 at the speed set by the low speed setting device 234 (step 327 in FIG. 9). When the ladle 50 reaches the standby position P4 above the crucible 171, the operation control unit 180 controls the I broadcast motor 3.
A stop command F3 is sent to the servo controller 33 of No. 0, and the ladle 50 is stopped (step 329 in FIG. 9).

Then, a reverse rotation command R2 and a low speed rotation command R4 are sent from the operation control unit 180 to the servo controller 158 of the tilting motor 150, and the ladle 50 is tilted to the neutral plane set by the setting device 221. It stops at the position (step 331 in FIG. 9).

In this way, the ladle 50 enters the standby operation at the standby position P4 (
Step 333 in FIG. 9).

When the mold clamping operation of the die-casting machine 1 is started, a transport command signal θC is sent from the control device (not shown) of the die-casting machine 1 to the operation control section 180.

When the transport command signal θC is input to the operation control unit 180 and the conditions described later are satisfied, the operation control unit 180 sends a forward rotation command signal F1 and a control speed command signal Fc to the servo controller 33 of the transport motor 30. As a result, the ladle 50 is transported at an appropriate controlled speed V toward the deceleration position P5 set by the deceleration position setting device 238 (step 335 in FIG. 9). Ladle 50 is at deceleration position P1
When the ladle 50 reaches the position P1, the output signals Fl and F4 are sent from the operation control unit 180 to the servo controller 33, and the ladle 50 is moved at a low speed 11 times toward the pouring position P1 (9th
Step 337 in the figure).

On the other hand, if the conditions described below are not satisfied before the transport ti age signal C is sent to the operation control unit 180, the ladle 50 descends at low speed from the furnace standby position P4 to the molten metal drawing position P3. (Step 339 in FIG. 9). Then, at the molten metal drawing position P3, the ladle 50 is tilted to the measuring angle position by the operation of the tilting motor 150 (step 323 in FIG. 9). The hot water level detection device 1 is detected by lowering the ladle 50.
The ladle 50 is held at the molten metal drawing position P3 until the time set by the second furnace time setting device 236 has elapsed from the time when the electrode rod 161 of 60 contacts the scene inside the crucible 171, and the ladle 50 is held at the molten metal drawing position P3, and the ladle 50 is partially solidified or The viscous or oxidized molten metal in the ladle 50 is replaced with new /S molten metal (step 341 in FIG. 9).

1).

When the time set by the setting device 236 has elapsed, the speed increases slowly.
One glue operation progresses, such as stopping the rise, neutralizing the ladle, and waiting on the furnace (9th
Steps 327 to 333 in the figure).

In conventional control devices, the low-speed and high-speed +a feed speeds of the conveyance 'JE' position were determined as -τ within the operation cycle, so the time required for pouring (predetermined tilting operation of the ladle) was constant. If this is the case, as shown in FIG. 10, the time required for transportation from the molten metal drawing position P3 to the pouring position P1 will vary by te' to teII. More specifically, in FIG. 10, case I is a case in which the molten metal drawing position P3 is the upper limit, and when the spraying work, etc. is completed within the standard time, t! The relationship between the transport distance and the transport time is shown, and case 2 is the case where the molten metal pumping position P3 is at the lower limit and the spraying operation takes more time than the standard time. W
It shows the relationship between the one-step transport distance to Pt and the transport time, and case ■ shows the relationship between the transport distance and transport time to the pouring position P1 when there is no waiting time on the furnace. The elapsed time from the pumping position P3 to the pouring position P1 is t.
There are variations in e' to teI+.

On the other hand, according to the control method and apparatus of the above-described embodiments of the present invention, according to the elapsed time from the time when the ladle 50 starts moving upward along the conveyance path P from the molten metal drawing position P3, /8 1. The transport time from the scooping position P3 to the pouring position P1 is constant. A broadcast speed control signal is provided to the servo controller 33 of the transport motor 30. Therefore, as shown in Fig. 11, there is no variation in the time required to transport the molten metal from the molten metal drawing position P3 to the pouring position P1, regardless of the fluctuations in the molten metal drawing position P3 and the fluctuations in the furnace standby time. . In Fig. 11, case I is the case where the molten metal drawing position P3 is the upper limit and the spraying work etc. is completed within the standard time, and the transport distance to the pouring position P1 and the ship speed time are the same. It shows the relationship, and the case ■
shows the relationship between the transport distance to the pouring level KP+ and the time per ship speed when the lower limit is the molten metal pumping position 1p3 and the spraying work etc. takes longer than the standard time. Case ■ shows the relationship between the transport distance and transport time to the pouring position P1 when there is no waiting time above the furnace. It remains constant. As shown in FIG. 11, in this embodiment, only the high-speed conveyance speed within the conveyance section from the furnace standby position P4 to the deceleration position P5 is variably controlled, and the time required for pouring, the deceleration position P5, The deceleration speed, the above-furnace standby position P4, the low speed of rise to the above-furnace standby position WP4, etc. are constant.

The control method of the above embodiment according to the present invention will be explained in more detail with reference to FIG. 11. In FIG. 11, the distance from the above-furnace standby position P4 to the deceleration value fP5 is assumed to be Dl (DI is constant). Further, the distance from the deceleration position P5 to the pouring position P1 is assumed to be D2 (D2 is constant). Further, the time required to transport the ladle 50 from the molten metal drawing position P3 to the pouring position P1 is assumed to be Tc (Tc is constant). Also,
It is assumed that the transport time of the ladle 5o from the deceleration value RPs to the pouring level WPt is t2 (t2 is constant). In addition, the maximum speed in the conveyance section from the furnace standby position P4 to the deceleration position P5 is set to Vmax (the value of Vmax is determined by the maximum speed setting device 23
Set at 8. ). Also, let tl be the elapsed time from when the ladle 5° starts rising from the i'8 hot water drawing position P3 until the conveyance command signal θC is input to the operation control unit 180 (t is variable). .

When the central processing unit (CPU)' of the operation control unit 180 receives the transfer command signal θC, the central processing unit (CPU)' performs 1. The remaining time t left for solicitation is calculated. The remaining time t is determined by the following formula.

t=Tc - (tl +t2) Next, the CPU sets the furnace standby position P4 based on this calculated value.
The speed V required for conveyance from to deceleration position P5 is determined by the following equation.

V=D1/, the CPU then determines whether the calculated speed value ■ is less than or equal to the maximum speed value Vmax set by the setting device 238, and if it is less than or equal to the maximum speed value Vmax, the calculated speed value ■ is A control speed command signal FcwojPj corresponding to the control speed command signal FcwojPj is sent to the servo controller 33 of the feed motor 30. This results in
As shown in cases 1 to 2 in FIG. 11, the conveyance speed in the conveyance section from the furnace standby position P4 to the deceleration position P5 is automatically adjusted by δ. Therefore, /8 Yang drawing position P3
Regardless of the change in J or the furnace standby time, the time required to transport the molten metal from the molten metal drawing position P3 to the pouring position P1 is kept constant.

On the other hand, if it is determined that the calculated speed value ■ exceeds the maximum speed value Vmax, as described above, the ladle 50 is returned to the crucible 171 and held in the furnace, and then returned to the standby position on the furnace. It rises to P4 (step 339 in Figure 9).
,321,323,341.327,329,331,
333). When the above-furnace standby position P4 is reached again in this manner, the operation control unit 180 again calculates the speed V value based on the manual force of the regular feed command signal θC, and determines whether it is equal to or less than the maximum speed value VmaX. If the speed value is less than or equal to the maximum speed value Vmax, a control speed command signal Fc corresponding to the calculated speed value ■ is sent to the servo controller 33 of the transport motor 30.

Although one embodiment of the device and the method of the present invention has been described above, the present invention is not limited to the aspects of the above-mentioned embodiment, and all patents apply! Desired Scope C22 Various changes can be made to each component within the scope of the described invention.

For example, in the above embodiment, the speed calculation is performed assuming that the pouring time of the ladle 50 at the pouring position P1 (the time for tilting the ladle 50) is constant even if the amount of hot water to be supplied changes. The tilting speed of the ladle 50 may be kept constant, the pouring time may be changed depending on the amount of hot water supplied, and the amount of change in the pouring time may be added as a correction amount when calculating the remaining time t described above.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, it is possible to equalize the amount of molten metal injected into the injection sleeve of a die-casting machine, thereby improving and making uniform the quality of die-cast products. Therefore, it is possible to provide a control method and a control device for an automatic hot water supply device for a die-casting machine.

[Brief explanation of the drawing]

Fig. 1 is a partially sectional front view of an automatic hot water supply device for a die-casting machine and its related equipment in one embodiment of the present invention, Fig. 2 is a plan view of the device shown in Fig. 1, and Fig. 3 is shown in Fig. 1. Figure 4 is an enlarged cross-sectional side view of the ladle conveyance control system of the apparatus shown in Figure 1. Figure 5 is an enlarged view of the ladle tilting control system of the apparatus shown in Figure 1. 6 is a half-sectional front view of the device shown in FIG. 1 taken along the line Vl-VI in FIG. 4; FIG. 7 is a half-sectional front view of the device shown in FIG. 1 in FIG. ■ Rear view seen along the line, Figure 8 is a block diagram schematically showing the ladle control device applied to the automatic water heater shown in Figure 1, Figure 9 is based on the control device shown in Figure 8. A flowchart showing a method for controlling an automatic water heater together with the operating status of a ladle, FIG. 10 is a conveyance characteristic diagram showing the relationship between ladle time and regular feeding distance in a conventional control method, and FIG. It is a conveyance characteristic diagram which shows the relationship between 1Yj of the ladle, the completion time, and the distance in the control method of the self-J hot water supply apparatus by the control device shown in the figure. 1-Die-casting machine, 30...tM feed motor, 50-Ladle, 150-1~I* motor, 180--Operation control unit, 190--Rotary encoder (position detection device).

Claims (1)

[Claims] 1. A ladle and transporting the ladle along a predetermined transport path between a molten metal drawing position in a crucible in a heat-retaining furnace and a molten metal pouring position near an injection sleeve of a die-casting machine. An automatic hot water supply device equipped with a ladle conveying means and a ladle tilting means for tilting the ladle synchronizes with the casting cycle of the die casting machine, repeating the mold clamping process, the injection process, and the product removal process in sequence,
After the mold clamping process of the die-casting machine is completed, the ladle is poured into the ladle at a pouring position near the injection sleeve of the die-casting machine. A certain amount of molten metal in the crucible in the insulated furnace is pumped out, and the ladle is placed on standby at a predetermined standby position above the crucible.Then, when the mold clamping process of the die-casting machine starts, the ladle is moved from the standby position. In a method of controlling an automatic hot water supply device for a die casting machine that starts transporting a ladle toward a pouring position, the time from when the ladle draws up molten metal to when the ladle finishes the pouring process is constant. Controlling the conveyance speed of the ladle from the standby position to the pouring position according to the time required from when the ladle draws up molten metal to when it starts from the standby position. A method for controlling an automatic water heater for a die-casting machine, characterized by: 2. In the method for controlling an automatic hot water supply device for a die casting machine according to claim 1, when the conveyance speed of the ladle from the standby position to the pouring position exceeds a predetermined allowable speed, 1. A method for controlling an automatic hot water supply device for a die-casting machine, characterized in that the device performs a molten metal pumping process again. 3. A ladle, and a ladle transport means for transporting the ladle along a predetermined transport route between a molten metal drawing position in a crucible in a heat-retaining furnace and a molten metal pouring position near an injection sleeve of a die-casting machine; An automatic hot water supply device equipped with a ladle tilting means for tilting the ladle is used to synchronize with the casting cycle of the die casting machine, which sequentially repeats the mold clamping process, the injection process, and the product removal process,
After the mold clamping process of the die-casting machine is completed, the ladle is poured into the ladle at a pouring position near the injection sleeve of the die-casting machine. A certain amount of molten metal in the crucible in the insulated furnace is pumped out, and the ladle is placed on standby at a predetermined standby position above the crucible.Then, when the mold clamping process of the die-casting machine starts, the ladle is moved from the standby position. In a control device for an automatic hot water supply device for a die-casting machine that starts transporting a ladle toward a pouring position, the control device causes the ladle to finish the pouring process from the time the ladle draws up molten metal. a conveyance speed calculation unit that calculates the conveyance speed of the ladle from the standby position to the deceleration position before the pouring position so that the time taken to reach the point is constant; A control device for an automatic hot water supply device for a die-casting machine, comprising a speed command section that sends a speed command signal to the ladle conveying means. 4. In the control device for an automatic hot water supply device for a die-casting machine as set forth in claim 3, the control device is configured such that the calculated speed value calculated by the conveyance speed calculating section exceeds a preset maximum speed value. A control device for an automatic hot water supply device for a die-casting machine, characterized in that the control device is provided with a re-spill-up control section for causing the ladle to perform a molten metal scooping process again and return to the standby position when the ladle is in the standby position.