JPH0780621A - Method for controlling supply of molten metal - Google Patents

Abstract

PURPOSE:To obtain a required molten metal supply quantity by calculating a time till reaching a prescribed molten metal supply quantity on the basis of the crosssectional area of an injection sleeve and supply molten metal flow rate and stopping the molten metal supply at the time of reaching a prescribed time. CONSTITUTION:A first temp. sensor 5 and a second temp. sensor 6 are arranged with a prescribed distance between them on the side surface of an injection sleeve 1 and connected to a control unit 8 through an A/D converter 7. The control unit 8 is composed of a memory 8a for storing the temp. obtd. from temp. sensors, a timer 8b for measuring the time required for raiding temp. from the reference temp. to the raised temp. of supplying the molten metal detected with the temp. sensors, a CPU 8c for calculating the time till reaching a prescribed height of the supplied molten metal on the basis of the supplied molten metal flow rate passing through the temp. sensors and the cross-sectional area and the supplied molten metal flow rate of the injection sleeve and a decision device 8d for commanding the start of supply and the stop of supply of the molten metal from an electromagnetic molten metal supplying device 9 on the basis of the molten metal supplying time till reaching the prescribed molten metal supplied quantity.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water supply control method for a vertical injection device of a die casting machine.

[0002]

2. Description of the Related Art Conventionally, in a hot water supply apparatus using an electromagnetic pump or the like for supplying hot water to an injection sleeve of a die casting machine, a timer is used to set the operating time of the electromagnetic pump or the like, and a small time is set at first. Then, hot water was supplied to the injection sleeve to solidify it, and the weight of the solidified test casting was measured, and the time required to gradually reach the target hot water supply weight was obtained.

Further, in the hot water supply apparatus utilizing the pressure difference, the injection pressure is adjusted to supply hot water to the injection sleeve to solidify it, and the weight of the solidified trial casting is measured, and the target hot water supply weight is gradually increased. I was looking for a time to become.

[0004]

According to the prior art, there were the following technical problems.

A decrease in the amount of hot water supplied due to clogging of the hot water supply pipe or the like as a change over time has an effect on the product shape, and not only is it difficult to adjust the amount of hot water supplied, but also the productivity.

A first object of the present invention is to provide an injection device for injecting a molten metal upward toward a mold, and a hot water supply device such as an electromagnetic pump or a pressure difference in an injection sleeve of the injection device. In a hot water supply control method of injecting molten metal using a hot water supply device utilizing, at least two or more temperature sensors are arranged, the temperature of the temperature sensors is used as a reference to determine the hot water supply flow rate, and whether or not the normal hot water supply flow rate is determined. The purpose is to determine.

A second object of the present invention is to provide an injection device for injecting the molten metal upward toward a mold, and a hot water supply device such as an electromagnetic pump or a pressure difference device in an injection sleeve of the injection device. In a hot water supply control method for injecting molten metal by using a hot water supply apparatus utilizing, at least two or more temperature sensors are arranged, the temperature of the temperature sensors is used as a reference to determine the hot water supply flow rate, and the injection sleeve is disconnected. The object is to obtain the desired amount of hot water by calculating the time required to reach the desired amount of hot water based on the area and the hot water supply flow rate, and stopping the supply of hot water when the predetermined time is reached.

[0008]

[Means for Solving the Problems]

In order to solve the above problems, the hot water supply control method of the present invention has the following means.

The first means of the present invention is equipped with an injection device for injecting the molten metal upward toward the mold, and an injection sleeve.
In a hot water supply control method in which a supply port is provided at the lower end of the valve, a hot water supply device communicating with the supply port is provided, and molten metal is injected into the injection sleeve, a predetermined side surface of the injection sleeve is determined. The first temperature sensor and the second temperature sensor are provided at a predetermined distance, and the level of hot water supply at each position of the first temperature sensor and the second temperature sensor based on the hot water supply flow rate and the detected temperature at that level are measured in advance. Then, the time from the detection of the level detection temperature detected by the first temperature sensor to the detection of the level detection temperature by the second temperature sensor is measured, and the first temperature sensor and the second temperature sensor are stored. The hot water supply flow rate at which the hot water supply passes between the temperature sensors is obtained, and this hot water supply flow rate is compared with a predetermined reference hot water supply flow rate to determine whether or not the hot water supply flow rate is normal.

A second means of the present invention is equipped with an injection device for injecting the molten metal upward toward a mold, a supply port is provided at the lower end of the injection sleeve, and hot water is connected to the supply port. In a hot water supply control method in which a device is disposed and molten metal is injected into the injection sleeve, a first temperature sensor and a second temperature sensor are provided on a side surface of the injection sleeve at a predetermined distance. Level detection of the hot water level at each position of the first temperature sensor and the second temperature sensor based on the hot water supply flow rate and the detected temperature of the level are stored in a memory in advance and detected by the first temperature sensor The time from the detection of the temperature to the detection of the level detection temperature detected by the second temperature sensor is measured, and the hot water supply flow rate at which hot water passes between the first temperature sensor and the second temperature sensor is obtained. Desired salary based on Determined by calculating the time until the height of the amount when, becomes a predetermined time, stops the supply of hot water,
Obtain the desired hot water supply.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the hot water supply control method of the present invention will be described below with reference to the drawings.

FIG. 1 is an explanatory view showing a hot water supply control method.
A vertical injection device including an injection sleeve 1 and a piston 2 configured to inject molten metal upward toward a mold (not shown) is provided, and a supply port 3 is provided at a lower end side portion of the injection sleeve 1. , The electromagnetic hot water supply device 9 through the pipe line 4 communicating with the supply port 3
And connected to the furnace 10. A first temperature sensor 5 and a second temperature sensor 6 are provided on a side surface of the injection sleeve 1 at a predetermined distance, and are connected to a control device 8 via an A / D converter 7.

The controller 8 has a memory 8a for preliminarily measuring and storing the level of hot water supply at each position of the first temperature sensor 5 and the second temperature sensor 6 based on the hot water supply flow rate and the detected temperature at that level, and the first temperature. A timer 8b for measuring the time from the detection of the level detection temperature detected by the sensor 5 to the detection of the level detection temperature detected by the second temperature sensor 6.
And a CPU 8c for calculating the time until the desired hot water supply amount is reached based on the hot water supply flow rate at which the hot water supply passes between the first temperature sensor 5 and the second temperature sensor 6 and the injection sleeve cross-sectional area and the hot water supply flow rate. And a determination means 8d for issuing a hot water supply command and a hot water supply stop command to the electromagnetic hot water supply device 9 based on the hot water supply time until the desired hot water supply amount is reached.

The distance from the upper end surface of the piston to the first temperature sensor 5 is h ₁ , the distance from the first temperature sensor 5 to the second temperature sensor 6 is h ₂ , and the second temperature sensor 6 to the hot water supply amount V (cc The distance to the height H corresponding to () is h ₃ . This distance h ₃ is a value obtained by calculation.

Next, the control for determining whether or not the flow rate of hot water is normal will be described.

First, in response to a hot water supply command, the molten metal in the furnace 10 is sent from the supply port 3 to the injection sleeve 1 via the pipe 4 by the electromagnetic water heater 9. The hot water supply time t (sec) from the detection of the level detection temperature detected by the first temperature sensor 5 to the detection of the level detection temperature detected by the second temperature sensor 6 is obtained by measuring with the timer 8b and stored in the memory 8a. To do.

Assuming that the hot water supply amount V2 (cc) between the first temperature sensor 5 and the second temperature sensor 6 and the hot water supply time t (sec), the hot water supply flow rate Q between the first temperature sensor 5 and the second temperature sensor 6 (Cc / s
ec) is expressed by the following equation.

[0018] Q = V2 / t = the _{^{π · D 2 · h 2/}} 4 t memory 8a predetermined reference hot water flow rate QX (cc / sec)
Is stored and the hot water supply flow rate Q (cc / sec) is compared with a predetermined reference hot water supply flow rate QX (cc / sec) by a predetermined allowable value to determine whether or not the hot water supply flow rate is normal by the determining means 8d. If there is an abnormality, issue a maintenance signal and stop operation.

Next, the hot water supply amount V (cc) corresponding to the casting product
A case of supplying hot water to the injection sleeve 1 will be described.

First, the hot water supply amount V (cc) corresponding to the casting product
Based on the above, the height H (mm) of the amount of hot water supplied from the upper surface of the piston is obtained based on the cross-sectional area (mm ² ) of the injection sleeve.

H = 4V / π · D ^{2 Since} the hot water supply time from the first temperature sensor 5 to the second temperature sensor 6 is t (sec), the first temperature sensor 5 passes the second temperature sensor 6. Hot water supply flow rate up to Q (cc / sec)
Is expressed by the following equation.

[0022] if ^{Q = π · D 2 · h} 2/4 t distance t ₃ of the hot water supply time required for hot-water supply until the h _3, from the first temperature sensor 5 so as to pass through a second temperature sensor 6 Since the hot water supply flow rate Q (cc / sec) is the same as the hot water supply flow rate Q (cc / sec) until the distance becomes h ₃ , it is expressed by the following equation.

[0023] ^{Q = π · D 2 · h} 2/4 t = π · D 2 ·
from _{h 3/4 t 3 t 3} = h 3 · t / h 2 In this equation, calculated the time t3, by hot water for the time t3 minutes a second temperature sensor 6 as a reference, the hot water supply amount V (cc)
To obtain a height H (mm) corresponding to

Therefore, even when the hot water supply flow rate Q (cc / sec) changes within the normal range due to clogging of the hot water supply pipe 4,
Since the hot water supply time t changes, an appropriate hot water supply amount Q (cc) can be obtained.

Further, when the desired hot water supply amount V changes due to die replacement, the height H (m) corresponding to the hot water supply amount V (cc)
It can be dealt with by changing m).

The temperature of the level of the molten metal passing through the first temperature sensor 5 and the second temperature sensor 6 depends on the injection sleeve 1.
From the relationship of the thermal conductivity of 10 ~ 2 than the actual temperature of hot water supply
Measured at 0% lower temperature.

Further, in the method for determining whether or not the flow rate of hot water is normal, the first temperature sensor 5 or the second temperature sensor 6 detects from the start of hot water supply of the molten metal to the injection sleeve, separately from the above embodiment. You may make it judge by comparing the hot water supply time until it passes the said temperature with reference time.

As described above, according to the present embodiment, the injection device is provided so as to inject the molten metal upward toward the mold, and the hot water supply device such as the electromagnetic pump or the pressure difference is provided in the injection sleeve. In a hot water supply control method for injecting molten metal using a hot water supply device utilizing, at least two or more temperature sensors are arranged, the temperature of the temperature sensors is used as a reference to determine the hot water supply flow rate, and whether or not the normal hot water supply flow rate is determined. It is possible to determine whether or not it is abnormal and stop the operation to maintain the hot water supply pipe to prevent defective products.

Further, according to this embodiment, the time until the desired hot water supply amount is calculated based on the cross-sectional area of the injection sleeve and the hot water supply flow rate, and when the predetermined time is reached, the hot water supply The supply can be stopped and the desired amount of hot water can be obtained.

[0030]

According to the present invention, a hot water supply device such as an electromagnetic pump or a hot water supply device utilizing a pressure difference is provided in an injection sleeve, which is provided with an injection device for injecting molten metal upward toward a mold. In the hot water supply control method of injecting molten metal using, at least two or more temperature sensors are arranged, the temperature of the temperature sensors is used as a reference to determine the hot water supply flow rate, and it is determined whether or not the normal hot water supply flow rate. Therefore, in the case of an abnormality, the operation can be stopped and maintenance can be performed to prevent the occurrence of defective products.

Further, according to the present invention, the time until the desired hot water supply amount is calculated based on the inner diameter cross-sectional area of the injection sleeve and the hot water supply flow rate, and when the predetermined time is reached, the hot water supply Since the supply is stopped, it is possible to obtain a desired hot water supply amount.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an apparatus for carrying out a hot water supply control method.

[Explanation of symbols]

 1 Sleeve 2 Piston 3 Supply Port 4 Hot Water Supply Pipe 5 First Temperature Sensor 6 Second Temperature Sensor 7 A / D Converter 8 Controller 9 Electromagnetic Water Heater 10 Furnace

Claims (2)

[Claims] 1. A vertical injection device for injecting molten metal upward toward a die, a supply port is provided at a lower end side portion of an injection sleeve, and a hot water supply device communicating with the supply port is provided. In the hot water supply control method of injecting the molten metal into the injection sleeve, a first temperature sensor and a second temperature sensor are provided on a side surface of the injection sleeve at a predetermined distance, and the first temperature sensor and the second temperature sensor are provided based on a hot water supply flow rate. The detected temperature of the hot water supply level at each position of the first temperature sensor and the second temperature sensor is measured in advance and stored in a memory, and the second temperature sensor is detected from the time when the level detected temperature detected by the first temperature sensor is detected. Measures the time until the detection of the level detection temperature, obtains the hot water supply flow rate at which the hot water supply passes between the first temperature sensor and the second temperature sensor, and compares this hot water supply flow rate with a predetermined reference hot water supply flow rate. Whether the hot water supply flow rate is normal Hot water supply control method according to claim determining. 2. A vertical injection device for injecting molten metal upward toward a mold, a supply port is provided at a lower end side portion of an injection sleeve, and a hot water supply device is provided through a pipe line communicating with the supply port. In the hot water supply control method, in which the molten metal is injected into the injection sleeve, a first temperature sensor and a second temperature sensor are provided on a side surface of the injection sleeve at a predetermined distance, The detected temperature of the hot water supply level at each position of the first temperature sensor and the second temperature sensor based on the flow rate is measured in advance and stored in a memory, and from the time of detection of the level detected temperature detected by the first temperature sensor, The time until the detection of the level detection temperature detected by the second temperature sensor is measured, the hot water supply flow rate at which the hot water passes between the first temperature sensor and the second temperature sensor is determined, and the desired hot water flow rate is calculated based on this speed. Until the amount of hot water supply is high Determination by calculating the time, when it is a predetermined time, stops the supply of hot water supply, hot water supply control method characterized by obtaining a desired hot-water supply amount.