JPH0332418B2 - - 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 equipment, the mold release agent spray and the 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 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 includes a temperature sensor for detecting the temperature of a casting mold, and a current temperature detected by the temperature sensor. The above objective is achieved by a configuration including a spray controller that adjusts the spraying time based on the rate of temperature change determined from the difference between the mold temperature data of 1 and the previous mold temperature data. be.

In short, the temperature of the casting mold is detected by a temperature sensor, and the spraying time of the mold release agent spray and the cooling water spray is adjusted according to the detected temperature data, especially to control the temperature change rate. The purpose is to maintain the mold temperature within a certain range during casting operation by carefully controlling the temperature.

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

In FIG. 1, a plurality of thermocouples 2 ₁ to 2 _o as temperature sensors are attached to each part of a casting mold 1, respectively. Temperature data T _{1 to} T _o of each part of the casting mold 1 detected by these thermocouples 2 1 to 2 _o
is input to a spray controller 3 equipped with a computer function.

The spray controller 3 includes the thermocouple 2
Temperature data of each part of casting mold 1 from ₁ to 2 _o T ₁ to
When T _o is given, the solenoid valve driver 4
The solenoid valve 6 of the release agent spray 5 is energized through the solenoid valve driver 7, and the solenoid valve 9 of the cooling water spray 8 is energized for the cooling water spraying time. . As a result, the mold release agent is sprayed only while the solenoid valve 6 is energized.
Also, cooling water is sprayed onto the casting mold 1 only during the time when the solenoid valve 9 is energized.

As shown in FIG. 2, the spray controller 3 is
CPU 11 and interface 1 connected to this CPU 11 via an address bus/data bus
2, 13, clock pulse generator 14, ROM 15 and RAM 16 that store a predetermined program
It is composed of. The interface 1
2 includes the thermocouples 2 ₁ to 2 _o , and the interface 13 includes the solenoid valve driver 4,
7 are connected to each other. In addition, the RAM
16 contains temperature data from the thermocouples 2 ₁ to 2 _o .
Registers R ₁ and R ₂ for storing T ₁ to _{T o} , registers R ₃ and R ₄ for storing release agent spraying time data and cooling water spraying time data, and a table memory TBM are provided.

As shown in FIG. 3, the register R ₁ stores the latest temperature data T _1o to T _oo among the temperature data T ₁ to _{T o} from the thermocouples 2 ₁ to 2 _o . ing. Also, register R ₂ contains the fourth
As shown in the figure, among the temperature data T ₁ to _{T o} from the thermocouples 2 ₁ to 2n, temperature data T _1p to T _op that is one sampling earlier than the latest data is stored. Furthermore, the table memory
As shown in Fig. 5, the TBM includes release agent spraying time data corresponding to the temperature change rate δ ₁ to δ _n of the casting mold 1.
t ₁ to _{t n} and cooling water spraying time data t ₁ ′ to t _n ′ are stored in advance.

Further, the CPU 11 performs the processing shown in FIG. 6 according to the program stored in the ROM 15.
That is, after transferring the temperature data of register R ₁ to register R ₂ , the temperature data T ₁ from thermocouples 2 ₁ to 2 _o
Store ~T _o in register _R1 . Here, after calculating the differences ΔT ₁ to _{ΔT o} between each temperature data T _1o to _{T oo} of register R 1 and each temperature data T _1p to _{T op} of register R ₂ , from these differences _{ΔT 1 to} ΔT _o The overall temperature change rate δ of the casting mold 1 is determined. Here, the temperature change rate δ is given by δ=(ΔT ₁ /T ₁ W ₁ +...+ΔT _o /T _o W _o )/n, and W ₁ to _{W o} in the formula are weight constants for the casting mold. What is necessary is just to set it suitably according to temperature detection part 1. After that, the one corresponding to the temperature change rate _δ is searched from among δ ₁ to _{δ n} in the table memory TBM, and the release agent spraying time (t ₁ to t _n ) and cooling water spraying time _t1 ' to _tn ', set them in registers _R3 and _R4 , and operate the solenoid valve 6 according to the release agent spraying time set in register _R3 . At the same time, the solenoid valve 9 is energized according to the cooling water spray time set in the register _R4 . Thereby, the spray controller 3 implements a memory type time adjustment means.

Therefore, according to this embodiment, the temperature of each part of the casting mold 1 is detected by the thermocouples ₂₁ to _2o , and the spraying time is adjusted according to the mold temperature by the spray controller 3 having a memorized time adjustment means. By setting and adjusting the excitation time of the solenoid valve 6 and the solenoid valve 9, the spraying time of the mold release agent and the spraying time of the cooling water can be adjusted according to the mold temperature.

In particular, the rate of change ΔT _{1 ~} of the temperature data T 1 ~ _{T o} of each part of the casting mold 1 detected by each thermocouple 2 ₁ ~ _{2 6}
The overall temperature change rate δ of the casting mold 1 is determined from ΔT _o , and the mold release agent spraying time and the cooling water spraying time are adjusted based on this temperature change rate δ. Temperature can be finely controlled, and mold temperature can always be maintained within a certain range during casting operation.

Therefore, since the casting mold 1 does not become overheated, the mold can be protected against overheating, and the temperature rise of the mold due to unnecessary spraying at the start of casting is not delayed.

Moreover, since the plurality of thermocouples 2 ₁ to 2 _o are arranged at each part of the casting mold 1, the mold temperature of the casting mold 1 can be detected accurately.

In the above embodiment, when calculating the release agent spraying time and the cooling water spraying time from the rate of temperature change of the casting mold 1, the calculation may be performed using a predetermined relational expression set in advance.

For example, the set temperature of each temperature detection part of the casting mold 1 is set as T _1s to T _os , the spraying time t _s when the mold 1 is at the set temperature, the proportionality constant G, and the weighting constant W ₁ to W _o , and the calculation is performed. Formula t=(T ₁ −T _1s /T ₁ W ₁ +…+T _o −T _os /T _o W _o )G/n+
The spraying time t can be calculated from _ts . At this time, it is also possible to set the minimum spraying time t _sp , and for the calculated spraying time t, if t>t _sp, t is used as the spraying time, and if t<t _sp , t _sp is used as the spraying time. good. By determining the spraying time in this way and then adjusting the spraying time in the same manner as in the embodiment described above, the spray controller 3 is provided with an arithmetic time adjustment means, and the same effect as in the embodiment described above is achieved. Obtainable.

In addition, in the above embodiment, the mold release agent spray 5
Although a spray device having both the cooling water spray 8 and the cooling water spray 8 has been described, the spray device may have only one of them, for example.

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 showing one embodiment of the present invention, FIG. 2 is a block diagram showing the configuration of a spray controller, and FIGS. 3 to 5 are memory maps.
FIG. 6 is a flowchart. 1... Casting mold, 2 ₁ - 2 _o ... Thermocouple as a temperature sensor, 3... Spray controller, 5...
...Mold release agent spray, 8...Cooling water spray, 16...RAM as storage means.

Claims (1)

[Scope of Claims] 1. A spray device for a die-casting machine 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 temperature sensor for detecting the temperature of a casting mold. and a spray controller that adjusts the spraying time based on the temperature change rate determined from the difference between the current mold temperature data and the previous mold temperature data. spray equipment. 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 controller calculates the release agent spraying time and the cooling water spraying time from the temperature data from the temperature sensor and a predetermined relational expression set in advance. , a calculation for adjusting the operating time of the release agent spray according to the mold release agent spraying time determined by this calculation, and adjusting the operating time of the cooling water spray according to the cooling water spraying time. A spray device for a die-casting machine, characterized in that it includes a time adjustment means. 4. In claim 1 or 2, the spray controller includes a storage means that stores in advance release agent spraying time data and cooling water spraying time data corresponding to various temperature data, and The mold release agent spraying time data and cooling water spraying time data corresponding to the temperature data given from the temperature sensor are read out from this storage means, and the mold release agent spraying is performed according to the read mold release agent spraying time data. 1. A spray device for a die-casting machine, comprising a memory type time adjustment means for adjusting an operation time of the cooling water spray and adjusting an operation time of the cooling water spray according to cooling water spray time data.