JPS62118962A - Device for controlling solidifying speed of casting in casting - Google Patents

Abstract

PURPOSE:To optionally and precisely control the solidifying speed of a casting by providing means for electronically controlling the flow of heat from chillers via heat exchangers. CONSTITUTION:The chillers 4a-7a and 4b-7b are disposed in the cavities 3a, 3b of a casting mold 1. The chillers 5a-7a, 5b-7b are connected via heat pipes 8a-10a, 8b-10b to the heat exchangers 11a-11c. The refrigerant from a refrigerator 14 is circulated to the heat exchangers 11a-11c. Temp. detectors 12 are attached to the chillers 4a-7a, 4b-7b and the temp. signals thereof are inputted to an electronic control device 13. The output from the device 13 is applied to valves 16a-16c of refrigerant supply lines 15a-15c, by which the opening degrees thereof are regulated and the temps. of the chillers 5a-7a, 5b-7b are controlled to desired values. The solidifying temp. of the casting is made uniform by such control device.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a casting apparatus. In particular, the present invention relates to an apparatus for controlling the solidification rate of a cast product in casting.

Conventional casting products have disadvantages such as low toughness and wide variation in quality when compared to forged products, so they are not used as structural materials that require high strength. However, since cast products can be formed into shapes and dimensions that are close to those of T4A products, they are cheaper to process, and if improvements in product quality can be achieved, they can be expected to replace forged products. .

In order to improve the toughness of cast products, it is necessary to make the crystal grains fine and uniform in size.

Conventionally, for this purpose, a chiller was placed in the mold to increase the solidification rate of the molten metal after pouring, and by appropriately determining the placement location of the chiller, the solidification rate due to the difference in wall thickness of the cast product was reduced. A method has been adopted to suppress fluctuations in .

Problems to be Solved by the Invention However, in the conventional method described above, no matter how strictly the position, size, shape, etc. of the cooling metal are determined, the solidification rate of the cast product cannot be controlled to a sufficiently satisfactory level. It is not possible.

Therefore, an object of the present invention is to provide a casting apparatus that can control the solidification rate of a cast product arbitrarily and more precisely than before.

Means for Solving the Problems In order to solve the above problems, the casting apparatus according to the present invention has the following features:
A chiller attached to the mold, a long and thin high thermally conductive member connected at one end to the chiller, a heat exchanger connected to the other end of the high thermally conductive member, and refluxed to the heat exchanger. It is characterized by comprising an electronic control device that controls the flow of refrigerant to control the solidification rate of the casting near the cooling metal.

In the present invention, since the flow of heat from the chiller can be controlled by the electronic control device, it is possible to arbitrarily control the slope velocity of the casting in the vicinity of the chiller. For castings with complex shapes, by arranging multiple chillers at appropriate positions and individually controlling the flow of heat from each chiller, the solidification rate of the entire casting can be made almost uniform. It becomes possible to For example, a heat pipe can be used as the high heat exchanger conductive member used in the present invention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring first to FIG. 1, the casting mold 1 shown in the figure has casting cavities 3a, 3b of mutually symmetrical shape. In the cavity 3a, cooling metals 5a, 6a, and 7a are arranged adjacent to a portion that is thicker than the minimum thickness portion 4. Similarly, cooling metals 5b and 6b are provided in the cavity 3b.

7b is placed. One end of a heat vibrator 8a'-9as10a is embedded in each of the chilled metals 5as6as7a, and the chilled metals 5b, 6b.

One ends of heat pipes 8b, 9b, and 10b are embedded in 7b.

The other ends of the heat vibes 8a, 8b are inserted into a heat exchanger 11a, as shown in FIG. Similarly, the other ends of the heat vibes 9a, 9b are inserted into the heat exchanger 11b, and the other ends of the heat pipes 10a, 10b are inserted into the heat exchanger 11c. A temperature sensor 12 such as a thermocouple is attached to each chiller, and a temperature signal from this temperature sensor 12 is sent to an electronic control device 13 such as a microcomputer.
is man-powered.

A refrigerator 14 is provided to circulate the refrigerant to each of the heat exchangers, and the refrigerant supply life 15 from the refrigerator 14 is
A, 15b, 15c have valves 16a, 16, respectively.
b, 16C is placed. The output of the electronic control device 13 is given to each valve 16a, 16b, L6C, and the opening degrees of these valves are adjusted to control the temperature of the chiller to a desired value.

FIG. 3 illustrates the content of control by the electronic control device 13. First, in step S, the cooling rate, measurement interval, and final measurement temperature are set, and then in step S2.
The end of pouring is instructed at . Next, measurement of the elapsed time from the end of pouring is started in step S3. Furthermore, in step S, detection of the surface temperature of the cooling metal is started. In step S5, the measurement interval TX
It is detected whether or not the measurement interval has elapsed, and if the measurement interval has elapsed, the measurement point number l corresponding to each chiller is set to zero in step 6. Then step S7
In step S8, 1 is added to the measurement point number l.
It is checked whether the cooling rate in the corresponding chiller is equal to the set value. If the cooling rate is not equal to the set value, it is checked in step Ss whether the actual cooling rate is greater or less than the set value.

If the actual cooling rate is lower than the set value, step S. At , a signal is generated that increases the opening of the corresponding valve. If the actual cooling rate is higher than the set value, a signal is generated to reduce the opening degree of the corresponding valve in step S11. And step Sa
The steps from then on are repeated.

If the actual cooling rate is equal to the set value, it is checked in step 12 whether the measurement point number has reached a predetermined number n, and if not, steps 7 and subsequent steps are repeated. If the measurement point number is equal to the predetermined number, a value obtained by adding the measurement interval to the time measurement value is calculated in step S13, and the next measurement time point is thereby set.

Furthermore, in step S14, the temperature of the chilled metal j
It is checked whether c+ is higher than the final measured temperature tr, and if the temperature of the chiller is high, the procedure from step S6 is repeated. When the temperature of the chiller becomes lower than the final measured temperature, the control operation is ended.

Effects As described above, in the present invention, the cooling rate of the chilled metal during casting can be precisely controlled by the electronic control device, so the solidification rate of the cast product can be controlled and made uniform. This makes it possible to manufacture cast products with excellent properties.

[Brief explanation of drawings]

A brief explanation of the first drawing is a sectional view of a mold in an embodiment of the present invention, and FIG. 2 is a schematic diagram showing an example of a control circuit.
FIG. 3 is a flowchart showing an example of control. 1...Mold, 3a, 3b...Cavity, 5a'-5bs 6a-6b17a, 7b...
...Cold metal, ga, 3b, ga, 9b, 10a, 10 b--heat vibrator, 12a, 12 b, 12 C--heat exchanger, 13
・・・・・・Electronic control unit, ``14... Refrigerator, 16a, 16 b, 16 C---... Valve Fig. 1 Fig. 2

Claims (1)

[Claims] A chiller attached to the mold, a long and thin high thermally conductive member connected at one end to the chiller, a heat exchanger connected to the other end of the high thermally conductive member, and refluxed to the heat exchanger. A solidification rate control device for a cast product in casting, comprising an electronic control device that controls the flow of a refrigerant to control the solidification rate of the cast product in the vicinity of the cooling metal.