JPS6092060A - Method for correcting pouring rate in die-casting machine - Google Patents

Abstract

PURPOSE:To obtain an optimum pouring rate without being affected by a flash, fin, etc. by determining the position where filling of a molten metal is completed from at least one point of the time of the point when an injection speed decreases and the point when the increase of an injection pressure starts and correcting the pouring rate of the next time so as to attain the prescribed position thereof. CONSTITUTION:The displacement X and injection speed of an injection plunger 13 and the injection pressure P in a cavity 5 are monitored on a monitor device 17 when the plunger 13 is advanced at a low speed up to the mid-way then at a high speed after a molten metal is supplied into an injection cylinder 3 by a pouring device 12. The displacement X of the plunger 13 at least one point of the time of the point of the time when the injection speed decreases and the point of the time when the increase in the pressure P starts is thus determined and the difference of the displacement X from the optimum value is determined. The pouring rate obtd. by said difference is fed back as the corrected pouring rate to the device 12.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for correcting the amount of hot water supplied to a die-casting machine to an appropriate value.

Conventionally, methods for correcting the amount of hot water supplied to a die-casting machine include visually checking the biscuit thickness and manually correcting the amount of hot water, or measuring the biscuit thickness at the completion of injection filling by measuring the injection stroke amount. ...from a device that does...
A method is known in which the amount of hot water supplied is corrected so that the biscuit thickness is constant.

However, since the former method is a manual operation, it has to rely on the intuition of one worker (as a result, there are difficulties in maintaining and managing the appropriate amount of hot water supply. Although there are no disadvantages associated with the above method, there is a disadvantage that if flash or cracking occurs, it will affect the biscuit thickness and the correction value for the amount of hot water supply will vary.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for correcting the amount of hot water supplied in a tie-casting machine, which is not affected by the occurrence of flashes, flashes, etc., and allows an optimum amount of hot water to be supplied.

Therefore, in the present invention, at least one of the injection speed and injection pressure of the die-casting machine is monitored, and the molten metal filling completion position is determined from at least one of the time when the injection speed decreases and the time when the injection pressure starts increasing, and the molten metal filling is completed. By correcting the next hot water supply amount so that the position is at the predetermined position.

” aims to achieve the purpose stated in item 1.

In short, by calculating the stroke amount of the injection plunger at at least one of the point at which the injection speed decreases and the point at which the injection pressure starts to increase, the next amount of hot water to be supplied is corrected so that this stroke end becomes a predetermined amount. This system is designed to provide the optimum amount of hot water without being affected by the occurrence of flashes, flashes, etc.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIG. 1 shows an outline of a die casting machine to which the method of the present invention is applied. In the figure, the fixed mold 1 has an injection port 2.
A molten metal such as aluminum is injected by an injection cylinder 3 through this injection port 2 and is injected and filled into a cavity 5 formed by a fixed mold l and a movable mold 4. Here, the pressure of the molten metal injected into the cavity 5 is detected by a pressure detector 6.

Further, the injection cylinder 3 is faced with a water heater 12 that supplies a predetermined amount of molten metal to the molten metal supply port 11 for each cycle, and a position detector 14 is connected to the injection plunger 13. When the detection head 16 moves in conjunction with the injection plunger 13, the detection head 16 moves the scale 15, that is, the injection plunger 13 is moved back. The amount of displacement X from the limit is detected. The displacement amount X of the injection plunger 13 detected here is input to the monitor device w17.

The monitor device 17 displays the displacement from the position detector 14! A register 18 that sequentially stores #X, and the pressure detector 6
In addition to a register 19 that sequentially stores the injection pressure P from 1 and a register 20 that stores a preset value of 40 r, a control section 21 is provided. The control unit 21 stores the displacement amount X from the position detector 14 and the injection pressure P from the pressure detector 6 in registers 18 and 19 at fixed time intervals, and calculates the displacement amount X from the displacement amount X stored in the register 18. Take the injection speed V, and the injection speed ■ is 0 or 0
When the injection pressure P decreases to a certain level or the injection pressure P starts to increase, the displacement amount
After calculating the difference between X and the value r preset in the register 20, a corrected hot water supply amount ΔW corresponding to the difference ΔX is calculated. Incidentally, since ΔX is the stroke amount of the injection plunger 13, the corrected hot water supply amount ΔW can be calculated by calculating the product of the cross-sectional area of the injection cylinder 3 and ΔX. The supplementary water supply amount ΔW determined by this is the above-mentioned hot water supply amount M12.
is given as a correction amount. This increases the amount of hot water! t1
2 is the correction hot water supply part ΔW given from the monitor device 12
Change the amount of hot water supplied by the amount.

In such a configuration, after the molten metal is supplied into the injection cylinder 3 by the hot water supply device 12, when the injection plunger 13 is advanced halfway at a low speed and then at a high speed, the monitor device 12 detects the displacement of the injection plunger 13. The quantity X and the injection speed 1 iV and the injection pressure P in the cavity 5 are monitored. FIG. 2 shows an example of monitoring waveforms in this injection process. Here, when the time point when the injection speed V of the injection plunger 13 has decreased to O or around 0 or the time point 1+ when the injection pressure P starts increasing, the time point when the filling of the molten metal into the cavity 5 is completed is detected. After the displacement amount X of the injection plunger 13 at that time point 1+ is read, the difference between the displacement amount X and the above-mentioned r is calculated.

Now, as shown in Figure i3, the maximum stroke from the retraction limit to the forward limit of the injection plunger 13 is R, the protrusion measure of the rlfl type movement is R2, the biscuit thickness is R1, and the push force that is related to the cavity capacity and boosting force is R. If the amount of hot water is R4, then r=R+ (R2+R3+R4)-(1)R:l=R
1-(R2+R4+ r), -(2). here,
Since R1, R2, and R4 are fixed values determined by the mold and boosting force, by correcting r to the optimal value, a product with the optimal biscuit thickness R3 should be obtained without being affected by flash or paris. .

Here, the optimal r is selected in advance through experiments and the like.

The value r is set in the register 20 of the monitor device 17. Then, the difference ΔX between the displacement amount The hot water supply amount ΔW is given to the hot water supply device 12 as a correction amount.

As a result, in the hot water supply device 12, the hot water supply amount is corrected by the corrected hot water supply amount ΔW.

Therefore, according to this embodiment, the injection speed V of the die-casting machine
and monitoring at least one of injection pressure P;
Determine the amount of displacement x of the injection plunger 13 at at least one of the time point when the injection speed V decreases and the time point when the injection pressure P starts to increase, determine the difference between this amount of displacement X and the optimum value r, and calculate the amount of hot water to be supplied based on this difference. Water heater 1 as corrected hot water supply amount
Since there is a two-way feedback, there is no need to visually check the thickness of the biscuit as in the past, and the optimum amount of hot water can be obtained without being affected by the occurrence of flash or cracks. Therefore, it is expected that the yield of products will improve.

In the above embodiment, both the injection speed and the injection pressure are monitored and the filling completion time is determined from both of them, but the filling completion time may be determined from only one of them.

Further, in the above embodiment, in the monitor device 17, when calculating the corrected hot water supply amount ΔW from the difference ΔX between the displacement 1x and r, it is calculated by calculation. If a table in which the corrected hot water supply amount ΔW is set in advance is prepared, the corrected hot water supply amount ΔW can be read from this table.

As described in Part 2, according to the present invention, an optimum amount of hot water can be obtained without being affected by the occurrence of flash, evaporation, etc., and therefore, a method of correcting the amount of hot water that can improve the yield of products is provided. can be provided.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing an overview of a tie casting machine to which the method of the present invention is applied, Fig. 2 is a diagram showing the displacement amount, speed, and injection pressure waveform of the injection plunger in the injection process, and Fig. 3 is a diagram showing the position of the injection plunger. FIG. Agent: Patent Attorney Sanemasa Kinoshita (and 1 other person) Figure 1 Procedure Supplement Jl Pentateuch (Method 1. Display of the Case 1982 Patent #Q No. 201237 No. 2, Title of Invention: Supplementation of hot water supply amount in die-casting machine) Method 3: Relationship with the person making the supplementary offer Special Edition Isasato 4J-)9i 4-2 Ginza, Chuo 1, Tokyo 104
No. 11 Name (345) Toshiba Machine Co., Ltd. Representative Kazuo Iimura 4, Agent address 12, Yoyogi Knee 1, Shibuya, Tokyo 151 (
lilQ East IL Hill 2F l Juko (03) 320-1
4216, number of inventions increased by sleeve d- None 7,
Joden in the details subject to supplementation (no change in content), Bee” 1st place 60

Claims (1)

[Claims] (1) Monitor at least one of the injection speed and injection pressure of the die-casting machine, determine the molten metal filling completion position from at least one of the time when the injection speed decreases and the time when the injection pressure starts increasing, and this molten metal filling completion position is determined as a predetermined point. 1. A method for correcting the amount of hot water supplied in a die-casting machine, characterized by correcting the next amount of hot water supplied so that the amount of hot water supplied is at a certain position.