JPH0155068B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a spray device for a die casting machine.

Generally, a die casting machine is provided with a spray device such as a mold release agent spray for spraying a mold release agent onto a casting mold, and an external cooling water spray for cooling the casting mold.

However, in conventional spray devices, the release agent spray and cooling water spray are each controlled by one timer, which results in unnecessary spraying at the start of casting, which delays the temperature rise of the casting mold. The drawbacks were that the casting mold could not be protected if it became overheated, and that it was difficult to maintain a constant mold temperature during casting operation.

SUMMARY OF THE INVENTION An object of the present invention is to provide a spray device for a die-casting machine that eliminates such conventional drawbacks.

Therefore, the present invention provides a spray device having at least one of a mold release agent spray and a cooling water spray, which comprises: a temperature sensor for detecting the temperature of a casting mold; a spray operation control means for operating the spray; a temperature discrimination control circuit that obtains mold temperature data representative of a casting mold from the temperature data detected by the temperature sensor and changes the operating time of the spray operation control means according to this mold temperature data; This configuration aims to achieve the above object.

In short, the temperature of the casting mold is detected by a temperature sensor, mold temperature data representative of the mold is determined from the detected temperature data, and mold release agent is sprayed according to the mold temperature data. By changing the operation time of the spray operation control means that operates the spray or cooling water spray, the spray time of the mold release agent spray or the cooling water spray can be controlled according to the mold temperature data, and the spray operation time can be controlled according to the mold temperature data. The purpose is to maintain the mold temperature within a certain range.

Embodiments of the present invention will be described below based on the drawings.

1 and 2 show a first embodiment of the invention. In FIG. 1, a plurality of thermocouples 21 _{to 26} , for example, six thermocouples, as temperature sensors, are attached to each part of a casting mold 1, respectively. Temperature data T ₁ to _{T 6} of each part of the casting mold 1 detected by these thermocouples 2 ₁ to 2 ₆ is input to the temperature discrimination control circuit 3. The temperature discrimination control circuit 3 includes a temperature discrimination circuit 4 and a timer control circuit 5.

The temperature discrimination circuit 4 includes each of the thermocouples 2 ₁ to 2 _{6 .}
After obtaining the mold temperature data T representing the casting mold 1 from the temperature data T ₁ to _{T 6} given from and the heat capacity of each part of the casting mold 1 handled by each thermocouple 2 ₁ to 2 ₆ , for example, , determines whether this mold temperature data T belongs to one of a plurality of preset temperature range divisions, and outputs temperature discrimination signals TS ₁ to _{TS 5} corresponding to the temperature range division to which the mold temperature data T belongs. The signal is output to the timer control circuit 5. For example, T<T ₁ ...TS ₁ T ₁ ≦T<T ₂ ...TS ₂ T ₂ ≦T<T ₃ ...TS ² T ₃ ≦T<T ₄ ...TS ₄ T ₄ ≦T...TS ₅ , the mold temperature data T is divided into five temperature range divisions, and temperature discrimination signals TS ₁ to _{TS 5} are output to the timer control circuit 5 corresponding to each temperature range division. ing.

The timer control circuit 5 is connected to the temperature determination circuit 4.
The timers ₆₁ to 65 are operated as spray operation control means for discriminating the temperature discrimination signals TS ₁ to TS ₅ given from the TS 1 to TS ₅ and operating the mold release agent spray, while operating the cooling water spray. Timer 7 ₁ to 7 ₅ as spray operation control means
Make one of these work. Here, these timers 6 ₁ to 6 ₅ or 7 ₁ to 7 ₅ are preset to have different operating time widths so that the mold temperature of the casting mold 1 is always maintained within a certain range. There is.

In FIG. 2, a drive circuit 13 for a release agent spray 12 is connected between the power supply terminals 11 via timer contacts 16 ₁ to 16 ₅ of the timers 6 ₁ to 6 ₅ , and a drive circuit 13 for a release agent spray 12 is connected to the timer 7. Cooling water spray 1 through timer contacts _{17 1} to _{17 5}
Four drive circuits 15 are connected. The drive circuit 13 includes a solenoid valve control circuit 18 and a solenoid valve 19. Further, the drive circuit 15 includes a solenoid valve control circuit 21 and a solenoid valve 22.

Next, the operation of this embodiment will be explained. Each thermocouple 2
When the temperature data T ₁ to T ₆ of each part of the casting mold 1 detected in steps ₁ to 2 ₆ is given to the temperature discrimination circuit 4, the temperature discrimination circuit 4 performs the casting process based on the temperature data T ₁ to T ₆ . After obtaining mold temperature data T that represents the mold 1, it is determined whether the mold temperature data T belongs to any of a plurality of preset temperature range classifications. A temperature discrimination signal TSn corresponding to the temperature range division to which it belongs is output to the timer control circuit 5. Then, the timer control circuit 5 receives the temperature discrimination signal given from the temperature discrimination circuit 4.
Either timer 6n or 7n corresponding to TSn is activated. As a result, the timer contact 16n of the timer 6n is closed, and the solenoid valve 19 is excited via the solenoid valve control circuit 18. On the other hand, as a result of the timer contact 17n of the timer 7n being closed, the solenoid valve 19 is excited via the solenoid valve control circuit 21. Solenoid valve 22 is energized. Therefore, the mold release agent is sprayed only while the solenoid valve 19 is energized, that is, the timer 6n is activated, and the mold release agent is sprayed only while the solenoid valve 22 is energized, that is, the timer 7n is activated. Cooling water is sprayed only for the specified time.

Therefore, according to the first embodiment, the thermocouples 2 ₁ to
Temperature data T ₁ to _{T 6} of each part of casting mold 1 by 2 ₆
is detected, mold temperature data 1 representative of the casting mold 1 is determined based on the detected temperature data T ₁ to _{T 6} , and the release agent spray 12 is operated in different ways according to this mold temperature data T. Since the timers 6 ₁ to 6 ₅ that operate in different time widths and the timers 7 ₁ to 7 ₅ that operate the cooling water spray 14 in different operation time widths can be operated selectively, the mold temperature during casting operation can be controlled at all times. It can be maintained within a certain range. Therefore, there is an advantage that unnecessary spraying at the start of casting can be prevented and the mold can be protected even if the mold temperature rises abnormally. Further, a plurality of thermocouples 2 ₁ to 2 ₆ are arranged in each part of the casting mold 1, and temperature data T 1 to T ₁ detected by these thermocouples 2 ₁ to 2 ₆ are collected.
Mold temperature data T representing casting mold 1 from T ₆
Since the temperature of the casting mold 1 is determined, the mold temperature of the casting mold 1 can be detected accurately.

3 and 4 show a second embodiment of the invention. In the description of this embodiment, the same components as those of the first embodiment are denoted by the same reference numerals, and the explanation thereof will be omitted. In Figure 3,
The temperature discrimination circuit 4 outputs temperature discrimination signals TS ₁ to TS corresponding to mold temperature data T representative of the casting mold 1.
TS ₅ is applied to the relay control circuit 31. The relay control circuit 31 includes a control section 32, an energization time table 33, a clock pulse generator 34, a counter 35 that counts clock pulses from the clock pulse generator 34 and inverts the output when the counted number reaches a set number, and a control. The output of the counter 35 is transmitted to the relay 41 by a command from the section 32.
A switching circuit 36 is included for selectively switching to 42. The energization time table 33 includes relays 41 and 42 corresponding to the temperature discrimination signals TS ₁ to TS ₅ .
Data t ₁ to _{t 5} for controlling the energization time are stored in advance. Further, the control unit 32 receives one of the temperature discrimination signals TS ₁ to TS from the temperature discrimination circuit 4.
When TS ₅ is given, data t ₁ corresponding to temperature discrimination signals TS ₁ to TS ₅ from the energization time table 33
~ _t5 is selected and set in the counter 35. Then, the output from the counter 35 causes the relay 41,
42 is excited, and when the counter number of the counter 34 reaches the set number, the relays 41 and 42 are demagnetized by the reversal of the output from the counter 34. As a result, the relay 4 is
Solenoid valve 1 through relay contact 51 of 1
9 is energized, and the solenoid valve 22 is energized through the relay contact 52 of the relay 42 for the duration of time when the relay 42 is energized.

Therefore, the second embodiment has the advantage that it is not necessary to provide a plurality of timers as in the first embodiment.

In each of the above embodiments, the mold temperature data T is divided into five temperature range divisions, and the temperature discrimination signals TS ₁ to _{TS 5} are set in accordance with the temperature range divisions.
However, the temperature range divisions are not limited to the five described in the above embodiment.

Further, in each of the above embodiments, a spray device having the mold release agent spray 12 and the cooling water spray 14 has been described, but the spray device may have, for example, only one of them.

As described above, according to the present invention, it is possible to provide a spray device for a die casting machine that can always maintain the mold temperature within a certain range during casting operation.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a control circuit showing a first embodiment of the present invention, FIG. 2 is a block diagram of its driving circuit, and FIG. 3 is a block diagram of a control circuit showing a second embodiment of the present invention. FIG. 4 is a block diagram of the drive circuit. DESCRIPTION _OF SYMBOLS 1...Casting mold, _21-26 ...Thermocouple as a temperature detection sensor, 3...Temperature discrimination control circuit, 4...
...Temperature discrimination circuit, 5...Timer control circuit, 6 ₁ ~
6 ₅ , 7 ₁ to 7 ₅ ... timer, 12 ... mold release agent spray, 14 ... cooling water spray, 32,
33...Relay.

Claims (1)

[Scope of Claims] 1. A spray device having at least one of a mold release agent spray and a cooling water spray, comprising: a temperature sensor for detecting the temperature of a casting mold; and a spray operation control means for operating the spray. , a temperature discrimination control circuit that obtains mold temperature data representative of a casting mold from the temperature data detected by the temperature sensor, and changes the operating time of the spray operation control means according to this mold temperature data; A spray device for a die-casting machine characterized by comprising: 2. The spray device for a die-casting machine according to claim 1, wherein the temperature sensor is constituted by a plurality of thermocouples attached to each part of a casting mold. 3. In claim 1 or 2, the spray operation control means selectively operates according to the mold temperature data obtained by the temperature discrimination control circuit, and performs the spray operation at a preset time, respectively. A spray device for a die-casting machine, comprising a plurality of activated timers. 4. In claim 3, the temperature discrimination control circuit obtains mold temperature data representative of a casting mold from the temperature data detected by the temperature sensor, and determines mold temperature data that corresponds to this mold temperature data. A spray device for a die-casting machine, comprising a temperature discrimination circuit that outputs a temperature discrimination signal, and a timer control circuit that selectively operates the timer based on the temperature discrimination signal given from the temperature discrimination circuit.