JPH0734984B2 - Method and apparatus for detecting proper hot water supply in die casting machine - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method and a device for detecting an appropriate hot water supply amount in a die casting machine.

[Prior Art] Conventionally, in the die casting machine, the casting conditions of the die casting product are always constant to obtain a stable and good quality product, and the thickness of the biscuit formed in the casting port of the product during casting is constant. When holding the biscuit part to remove the product from the mold or removing the biscuit part from the product after removal by cutting, keep the grip position of the biscuit part and the product installation position constant. From the molten metal holding furnace, to keep the thickness of the biscuit constant for easier work, or to minimize the amount of molten metal waste and supply the minimum required amount into the injection sleeve each time. Efforts have been made to ensure that the amount of molten metal pumped by the ladle and fed to the injection sleeve is the same each time.

However, in reality, due to the height of the molten metal in the holding furnace, the temperature of the molten metal pumped out, the operation accuracy of the automatic feeding device itself, which is a ladle carrier, etc., the amount of molten metal supplied to the injection sleeve is
It may come gradually or suddenly. Further, in the early stage of operation, it was not always possible to easily set the hot water supply amount to a desired amount.

Conventionally, as an attempt to keep the hot water supply amount constant every time, for example, as disclosed in Japanese Patent Publication No. 59-21261,
Some were based on the results of measuring the weight of the molten metal pumped out of the ladle, and some were based on the results of measuring the forward stroke of the plunger tip during filling and calculating the thickness of the biscuit part by calculation.

[Problems to be Solved by the Invention] In a conventional one in which the amount of hot water supplied is controlled by measuring the weight of the molten metal pumped out by a ladle, it is necessary to perform the process while pumping the molten metal from the furnace and transporting it to the injection sleeve. , It was relatively difficult and troublesome to accurately detect the subtle difference in weight during the movement.

On the other hand, in the case of controlling the hot water supply amount based on the result of calculating the forward stroke of the plunger tip at the time of filling and calculating the thickness of the biscuit portion by calculation, it is necessary to perform calculation and the like, which is troublesome. In addition, since the calculation is based on the forward stroke of the plunger tip, if the retract limit of the plunger tip is slightly different for each injection,
The thickness of the biscuit portion could not be detected accurately each time, and as a result, it was not possible to always control the amount of hot water to be supplied accurately.

[Means and Actions for Solving the Problems] In the present invention, in order to solve these problems, when a cast product molded by a die casting machine is grasped by a product take-out device and taken out from a mold, A bar of a specified length that protrudes from the chuck holding part in the axial direction of the machine is brought into contact with the separation surface of the mold, and the end surface position of the biscuit part of the cast product at this time is in the axial direction of the machine. Whether or not the position is within the predetermined range is detected by the biscuit end face position detection device provided in the chuck holding portion, and thereby whether or not the hot water supply amount is appropriate is detected.

Further, as a device therefor, a predetermined length that can be brought into contact with the separation surface of the mold by projecting in the axial direction of the machine from a part of the chuck holding portion of the product take-out device that is also movable in the axial direction of the machine Using a device with a bar, the chuck holding part has a biscuit end face position detection device that detects whether the end face position of the biscuit part of the cast product is within a predetermined range in the axial direction of the machine. .

[Example] FIG. 2 shows a main part of a die casting machine and a device similar to the product take-out device known from Japanese Utility Model Publication No. 60-19809, but the method of the present invention is carried out. The device for improving the chuck part of such a product take-out device is used. In FIG. 2, 1 is a fixed platen, 2 is a movable platen, 3 is a fixed mold, 4 is a movable mold, 4a is a separation surface of the movable mold 4, 5 is a cast product, 6 is a cast product 5. Biscuit part, 6a is end face of biscuit part 6, 7 is push pin
Product take-out device consisting of 7a, extrusion plate 7b, and extrusion cylinder 7c, 8
Is an injection sleeve attached to the fixed plate 1, 9 is a plunger tip, 10 is a plunger, 11 is an injection cylinder, and 12 is a product take-out device attached to the fixed plate 1.

In the product take-out device 12, for example, a slide arm 14 is provided so as to be able to move back and forth in the axial direction of the machine by the action of a cylinder 13 provided on the fixed platen 1. That is, the slide arm 14 was attached to the tip end portion of the piston rod 13a of the cylinder 13 via the arm 15 and the guide rod 17 supported by the plurality of rollers 16 provided in contact with the upper and lower surfaces. The slide arm 14 is provided so as to be movable in a direction perpendicular to the axis of the machine. Reference numeral 18 is a cylinder for moving the slide arm 14, and 19 is a chuck holding portion for gripping a product. The chuck holding portion 19 attached to the lower end of the slide arm 14 may be attached to the slide arm 14 so that the shaft 14a can be rotated 90 degrees with respect to the slide arm 14 if necessary.

The chuck holding portion 19 can move parallel to the axis of the machine when the biscuit portion 6 of the cast product 5 is grasped and taken out from the movable mold 4. In the chuck holding portion 19, a plurality of claws 20 are provided so that the biscuit portion 6 can be opened and closed freely, as is commonly used.

In FIG. 1 showing one embodiment of the chuck holding part 19, it is possible to abut on the separation surface 4a of the movable mold 4 which is projected from a part of the chuck holding part 19 in the axial direction of the machine and is open. A bar 21 having a predetermined length is provided. The length of the bar 21 is such that the tip of the bar 21 can be in slight contact with the separation surface 4a of the movable mold 4 when the predetermined portion of the biscuit portion 6 is gripped by the claw 20. Of course, after the tip of the bar 21 is brought into contact with the separation surface 4a of the movable mold 4, the claw 20 is closed and the biscuit portion 6
The bar 21 can be grasped, or the length of the bar 21 can be adjusted appropriately.

The bar 21 is provided with a first limit switch 22a and a second limit switch 22b, which are one type of a biscuit end face position detection device 22 that detects the tip position of the biscuit portion 6, so that the position can be adjusted. When the tip of the bar 21 is brought into contact with the separation surface 4a of the movable mold 4 when the biscuit portion 6 is gripped by the claw 20, for example, two limit switches 22a attached with a space of several mm, Biscuit part 6 of normal thickness between 22b
It is adjusted beforehand based on experience and test results so that the tip surface 6a of the can be located. That is, the first limit switch 22a is ON and the second limit switch 22b is
When is OFF, the biscuit part 6 has a thickness B within an appropriate range.
Or, it is determined that the length is longer, and naturally, it is determined that the amount of molten metal supplied to the injection sleeve 8 is within an appropriate range. On the other hand, if both limit switches 22a, 22b are turned on, it can be seen that the biscuit part 6 is too thick and the hot water supply amount is too large. If both limit switches 22a, 22b are off, the biscuit part is too thin. Since it can be seen that the hot water supply amount is too small, in these cases, the hot water supply amount and the injection operation are performed by appropriately adjusting the next hot water supply amount.

In the second embodiment shown in FIGS. 3 and 4, the thickness B of the biscuit portion 6, that is, the position of the end face 6a is changed to the limit switch.
In addition to being able to detect with 22a and 22b, it is possible to detect more accurately with a magnetic scale or the like.

In FIGS. 3 and 4, 19 is a chuck holding portion, 20 is a plurality of claws that can be opened and closed, 21 is a bar that is attached to the chuck holding portion 19, and has its tip end surface brought into contact with the separation surface 4a of the movable mold 4, 5 is a cast product. The chuck holding portion 19 is provided with a movable bar 23 whose front end surface can be brought into contact with the end surface 6a of the biscuit 6 so as to be movable in the axial direction of the machine. Reference numeral 24 denotes a compression spring provided between a collar portion 25 provided on a part of the movable bar 23 and a part of the chuck holding portion 19, and by the action of the compression spring 24, the movable bar 23
Can be reliably brought into contact with the end surface 6a of the biscuit portion 6. A flange portion 26 is provided in a part of the movable bar 23 inside the chuck holding portion 19, and a part of the flange portion 26 is used as a shaft.
1st limit switch 22 positionably mounted on 27
The a and the second limit switch 22b can be operated. The operation of the limit switches 22a and 22b is the same as the first
The limit switch 22a is ON
Then, when the limit switch 22b is OFF, the biscuit part 6
Is within the desired thickness range.

In this embodiment, not only the limit switches 22a and 22b, but instead of this, the thickness B of the biscuit portion 6 can be detected by a magnetic scale device.

The bar 21 in the chuck holding portion 19 is used as the magnetic scale portion 28, the magnetic head 29 is attached to a part of the flange portion 26, and the thickness of the biscuit portion 6 is increased by the action of the magnetic scale portion 28 and the magnetic head 29. It was made possible to detect B accurately. Then, when the detected thickness B of the biscuit is within the desired range, the hot water supply amount for the next time is kept unchanged, and when it is out of the range, the thickness of the biscuit portion 6 for the next injection is within the desired range. The hot water supply amount for the next time is adjusted according to the deviation amount so as to enter.

What is shown in FIG. 5 is, for example, an automatic water heater 31 known in Japanese Patent Publication No. Sho 59-21262, in which 31a is a main body, 32 is a first arm that is rotationally driven, 33 is a second arm, and 34 is a second arm. 2 Ladder rotatably provided at the tip of arm 33, and 35 is arm 32
A drive source such as a motor for moving a ladle for rotating the ladle 34 to move the ladle 34 between the holding furnace 36 and the injection sleeve 8 portion, 37
Is a drive source such as a motor for tilting the ladle 34. By the action of the drive source 37 for tilting the ladle, the ladle 34 is tilted by the hot water supply port 8a of the injection sleeve 8 and the injection sleeve 8 is rotated.
The molten metal can be supplied to the inside, and the amount of hot water to be supplied can be changed by appropriately adjusting the angle θ of the ladle 34 when the ladle 34 is put into the molten metal 38 when the molten metal is pumped out in the furnace 36. After the molten metal 38 is pumped out of the furnace 36, the ladle 34 is returned to the horizontal state and conveyed.

Therefore, when the injection molding is performed by the injection device and the biscuit portion 6 is formed at the end of injection when the molten metal is filled in the cavity of the mold, and the thickness B of the biscuit portion 6 falls within the set range, then Since the amount of hot water supplied is satisfactory, the next step is to use the ladle when pumping the molten metal 38 from the furnace 36.
Leave the tilt angle θ of 34 unchanged. However, when the thickness B of the biscuit portion 6 is out of the set range, the tilt angle θ of the ladle 34 when pumping the molten metal 38 out of the furnace 36 is appropriately changed to a predetermined amount of hot water supply. Adjust so that

That is, the setting device for setting the biscuit thickness B to a desired value, the biscuit thickness detecting device as described above,
The output signal from the setter is compared with the output signal from the biscuit thickness detecting device, and a comparator that outputs an output signal according to the deviation and a ladle 34 at the time of subsequent molten metal pumping according to the output signal from this comparator A hot water supply amount control device for adjusting the tilt angle θ is provided, and the hot water supply amount is controlled by these actions.

When controlling the hot water supply amount based on the biscuit thickness B, for example, as shown in FIG. 6, a constant automatic correction allowable width d is provided above and below the set value C, and the automatic correction allowable upper limit D is set. provided a _U and automatic correction tolerance lower limit D _D, a large constant alarm tolerance e than the automatic correction allowable width d is provided vertically with respect to the set value C, alarm tolerance limit E _U and alarm tolerance The lower limit E _D is provided, and the measured value C is between the automatic correction allowable upper limit D _U and the automatic correction allowable lower limit D _D
When the measured value C is not corrected, the measured value C is automatically adjusted between the automatic correction allowable upper limit D _U and the alarm allowable upper limit E _U and between the automatic correction allowable lower limit D _D and the alarm allowable lower limit E _D. correction when in practice area G to correct subsequent hot water supply amount, measured value alarm tolerance limit E _U greater than, or if the alarm tolerance limit E _D smaller than, with issuing an alarm, automatic water heater 31 Is stopped to check and repair a bad place, or the hot water supply amount of the next time is largely corrected so that the set value C is reached.

When the measured value exceeds the automatic correction execution area G, when started to operate the die-casting machines and automatic hot water supply apparatus 31, because not yet operated stable, in this case, the area P ₁ convergence previous parameters Judge and fix relatively quickly. For example, if the measured value enters the automatic correction execution area G even once, it is corrected immediately, or when the measured value enters twice consecutively, for example, M ₁ and M ₂ , And set value C will be corrected next time by the difference d ₁ .

Further, if the operation becomes relatively stable after a short time from the start of the operation, in this case, it is determined to be the area P _{2 of the} post-convergence parameter, and correction is performed while observing the state of a larger number of times. For example, the measured value is stored in the computer every time, and if the measured value enters the automatic correction execution area G even once, the measured value is traced back from the final measured value M ₉ several times, for example, 5 times to the highest value. Of the remaining number of measurements excluding the value M ₉ and the lowest value M ₅ . Ask for that Is corrected next time by the difference of the set value C.

[Effects of the Invention] In the present invention, as described in the claims,
When a cast product formed by a die-casting machine is grasped by a product take-out device and taken out from the mold, a bar of a specified length is projected from a part of the chuck holding part of the product take-out device in the axial direction of the machine. The position of the end face of the biscuit on the chuck holding part is detected by contacting the separation surface of the mold and checking whether the end face position of the biscuit part of the cast product at this time is within a predetermined range in the axial direction of the machine. Since it is detected by the device and whether or not the amount of hot water supply is appropriate is detected by this, it is possible to detect whether or not the biscuit thickness is within the appropriate range very easily and quickly. Then, by detecting the biscuit thickness for each injection, it is possible to automatically adjust the amount of hot water to be supplied thereafter, so that die casting can always be performed under almost the same injection conditions, and automatic continuous operation is possible. A good quality die cast product can be easily obtained by operation.

[Brief description of drawings]

FIG. 1 is a view for explaining an apparatus or the like for carrying out the method of the present invention. FIG. 1 is a front view of a chuck holding portion showing a first embodiment of the present invention, and FIG. 2 is a main view of a die casting machine. Section and a product take-out device section (first section front view), FIG. 3 is a longitudinal section view of a chuck holding section showing a second embodiment of the present invention, and FIG. 4 is a section view of FIG. FIG. 5 is a sectional view taken along line IV-IV, FIG. 5 is a front view of the automatic hot water supply unit, and FIG. 6 is a diagram showing an example of a controlled state of the amount of hot water supply. 1 ... Fixed plate, 2 ... Movable plate, 3 ... Fixed mold, 4 ... Movable mold, 4a ... Separation surface, 5 ... Cast product, 6 ... Biscuit part, 6a ... End surface, 8 ... Injection sleeve, 11 ... Injection cylinder, 12 ... Product take-out device, 19 ... Chuck holding part, 20 ... Claw, 21 ... Bar, 22 ... Biscuit end face position detection device, 22a, 22b ... Limit switch, 23 …… Movable bar, 28 …… Magnetic scale, 29 …… Magnetic head, 31 …… Automatic water heater.

Claims (2)

[Claims] 1. When a cast product formed by a die casting machine is grasped by a product take-out device and taken out from a mold, a predetermined length is projected from a part of a chuck holding portion of the product take-out device in the axial direction of the machine. The chuck holding part determines whether the end surface position of the biscuit part of the cast product at this time is in contact with the separation surface of the mold and is within a predetermined range in the axial direction of the machine. A proper hot water supply detection method in a die casting machine, which detects by a biscuit end face position detection device, and thereby detects whether or not the hot water supply amount is appropriate. 2. A bar having a predetermined length, which is projected from a part of a chuck holding portion of a product take-out device movable in the axial direction of the machine in the axial direction of the machine and can come into contact with a separation surface of a mold. The appropriate hot water supply amount in the die casting machine with the chuck holding part equipped with a biscuit end face position detection device that detects whether the end face position of the biscuit part of the cast product is within a predetermined range in the axial direction of the machine. Detection device.