JPH05200519A - Method for controlling temperature of die - Google Patents

Abstract

PURPOSE:To provide a formed product having high quality by inputting the detected value of die temp. to a CPU as a digital signal, executing a prescribed calculation, transmitting an alarm signal, operating a heating device and a cooling device and controlling the die temp. to a prescribed temp. CONSTITUTION:To an interface 24, the detected value of a temp. sensor 9 for detecting the die 1 temp. is inputted as the digital signal and further, the detected values of a flow rate meter 11, water pressure sensor 12 and water temp. sensor 13 for detecting the flow rate, water pressure and temp. of the cooling water flowing in a supplying pipe 8 are inputted as the digital signals. Basic control values are previously stored into a memory 23 and the prescribed calculations are executed according to the signals of the temp. sensor 9, flow rate meter 11, water pressure sensor 12 and water temp. sensor 13 by the CPU 22, and an on-off signal to an electrical heater 6a and solenoid valves 10a, 10b or an alarm signal to an alarm 25 are transmitted from the interface 24. By this method, the die is controlled to the prescribed temp. and the formed product having high quality can be provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold temperature control device for maintaining a mold temperature at a predetermined value.

[0002]

2. Description of the Related Art Conventionally, a mold is preheated as follows before casting is started. That is, the molten or heated high-temperature molding target material is injected into the cavity of the mold at room temperature, so-called throwing out, or the mold is preheated by using a preheating device such as a burner or an electric heater. Next, during casting, cooling water was circulated in the mold to cool the mold.

[Problems to be Solved by the Invention]

In the above-mentioned conventional ones, the mold is preheated and cooled without detecting the temperature of the mold, so that the temperature of the mold becomes unstable, the cavity surface is thermally damaged during preheating, and the mold is cast. There was a defect that the precision of the molded product varied. It is an object of the present invention to obtain a novel mold temperature control device that solves the above drawbacks.

[0004]

In order to achieve the above object, the present invention is configured as follows. That is, as shown in FIG. 1, a heating device 6 for heating the die 1 and a cooling device 7 for cooling the die 1 are provided, and a temperature detecting means 15 for detecting the temperature of the die 1 and a temperature detecting means 15 are provided. When the output is less than a predetermined value, a first signal 17 is output, and when the output is a predetermined value or more, a second signal 18 is output. 6, a heating instruction means 19 for issuing a heating instruction, and a cooling instruction means 20 for inputting the second signal 18 of the determination means 16 to issue a cooling instruction to the cooling device 7 are provided.

[0005]

Since the present invention is configured as described above, when the output of the temperature detecting means 15 is less than the predetermined value due to the temperature drop of the mold 1, the judging means 16 issues the first signal 17 and the heating command means 19. Inputs the first signal 17 to issue a heating command to the heating device 6, and the heating device 6 operates to heat the mold 1. Further, when the output of the temperature detecting means 15 exceeds a predetermined value due to the temperature rise of the mold 1, the judging means 1
6 issues a second signal 18, and the cooling command means 20 causes the second signal
A signal 18 is input to issue a cooling command to the cooling device 7, and the cooling device 7 operates to cool the mold 1. As a result, the mold 1 is maintained at a predetermined temperature.

[0006]

Embodiments of the present invention will now be described with reference to the drawings. 2 is a block diagram showing an embodiment of the present invention, FIG. 3 is a flowchart thereof, and FIG. 4 is a temperature characteristic diagram of a mold. In FIG. 2, reference numeral 1 denotes a vertically split mold, which has a fixed mold 2 fixed to a base and a movable mold 3 vertically attached to and detached from the fixed mold 2. A cavity 4 is formed on the mating surface portion of the mold 2 and the movable mold 3, and a pouring port 5 communicating with the cavity 4 is formed on the movable mold 3 side.

The mold 1 is provided with an electric heating type heating device 6 and a water type cooling device 7. The heating device 6 has an electric heater 6a embedded in the lower part of the fixed mold 2, and the cooling device 7 has a flow path 7 in the lower part of the fixed mold 2 and in the upper part of the movable mold 3.
A and 7b are formed so as to penetrate in the left-right direction, and branch pipes 8a and 8b of a supply pipe 8 for supplying cooling water are detachably connected to the right ends of the flow paths 7a and 7b. A plurality of temperature sensors (thermocouples) 9 are mounted in the fixed mold 2 and the movable mold 3,
The branch pipes 8a and 8b are opened and closed by solenoid valves 10a and 10b, and a flow meter 11, a water pressure sensor 12 and a water temperature sensor 13 are attached to the supply pipe 8 on the upstream side thereof.

The electric heater 6a and the solenoid valve 10a,
10 b is controlled by the microcomputer 21. The microcomputer 21 is mainly composed of a CPU (arithmetic unit) 22, a memory (storage unit) 23, and an interface (input / output signal processing unit) 24. The detection value of the temperature sensor 9 that detects the temperature of the mold 1 is input to the interface 24 as a digital signal,
A flow meter 11, a water pressure sensor 12, and a water temperature sensor 13 that detect the flow rate, water pressure, and temperature of the cooling water flowing through the supply pipe 8.
The detected value of is input as a digital signal. Then, the basic control value is stored in advance in the memory 23, and the CP
U22 performs a predetermined calculation according to the signal from the temperature sensor 9, the flow meter 11, the water pressure sensor 12, and the water temperature sensor 13, and outputs an ON / OFF signal or an alarm from the interface 24 to the electric heater 6a and the solenoid valves 10a and 10b. An alarm signal is sent to the container 25.

FIG. 3 is a flowchart for executing the above control.
Shown in. Note that P1 to P15 in FIG. 3 indicate steps of the flowchart. When the power switch is turned on, it starts at P1, and at P2 and P3, the signals of the water pressure sensor 12 and the water temperature sensor 13 are input to judge whether the water pressure and the water temperature of the cooling water in the supply pipe 8 are normal. If normal, P
In 4, the temperature of the mold 1 is input by the temperature sensor 9, and in P5, it is determined whether the temperature of the mold 1 is 280 ° C. or lower. 280
When the temperature is lower than ℃, the solenoid valves 10a and 10b are closed by P6 and P7, the switch of the heater 6a is turned on, and the mold 1 is heated (preheated) until the mold 1 reaches 300 ° C. at P8.
When the temperature of the mold 1 is 280 ° C. or higher in 5, the process proceeds to P8.

When the mold 1 is preheated, the material to be molded, which is a molten material, is injected into the cavity 4 in this example. When the mold 1 is heated to 300 ° C. by the injection of the material to be molded, the heater 6a is turned off at P9, the solenoid valves 10a and 10b are opened at P10, and the cooling water is supplied to the supply pipe 8 and the branch pipe. The mold 1 is cooled by flowing through the flow paths 7a and 7b through 8a and 8b, and the signal of the flow meter 11 is input at P11 to determine whether the flow condition inside the supply pipe 8 is normal. If it is normal, check on / off of the power switch on P12. If the power switch is on, jump to P2 to continue the control program,
As a result, the mold 1 is heated to about 280 ° C. to 30 ° C. as shown in FIG.
Hold at 0 ° C. When the power switch is off, P
After closing the solenoid valves 10a and 10b at 13, the control program ends at P14. When it is determined that there is an abnormality in P2, P3 and P11, an alarm is issued in P15.

[0011]

As is apparent from the above description, according to the present invention, the heating device and the cooling device are operated while detecting the temperature of the mold to control the mold at a predetermined temperature. It is possible to obtain a quality molded product.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram showing the present invention.

FIG. 2 is a block diagram showing an embodiment of the present invention.

FIG. 3 is a flowchart illustrating software for controlling a heating device and a cooling device.

FIG. 4 is a temperature characteristic diagram of a mold whose temperature is controlled using a heating device and a cooling device.

[Explanation of symbols]

 1 mold 2 fixed mold 3 movable mold 4 cavity 5 pouring port 6 heating device 6a heater 7 cooling device 7a flow path 7b flow path 8 supply pipe 8a branch pipe 8b branch pipe 9 temperature sensor 10a solenoid valve 10b solenoid valve 11 flow rate Total 12 Water pressure sensor 13 Water temperature sensor 15 Temperature detecting means 16 Judging means 17 First signal 18 Second signal 19 Heating instruction means 20 Cooling instruction means

Claims (1)

[Claims] 1. A heating device for heating a mold and a cooling device for cooling the mold are provided, the temperature detecting means for detecting the temperature of the mold, and the first when the output of the temperature detecting means is less than a predetermined value. As a signal, a judging means for issuing a second signal when the output is equal to or more than a predetermined value, a heating command means for inputting the first signal of the judging means and issuing a heating command to the heating device, and a second signal for the judging means. And a cooling command means for issuing a cooling command to the cooling device.