JPS5982143A - Control device for temperature of die - Google Patents

Abstract

PURPOSE:To control the temp. of a die only by adjusting the flow rate of cooling water in the stage of die casting by measuring the die temp. at a specific point of time at every casting cycle and supplying the cooling water to the die and stopping the supply thereto according to the measured value thereof. CONSTITUTION:A temp. detector 4 is provided to a die 1 and plural solenoid valves V1-Vn are provided in parallel between a cooling water path 2 for the die and a cooling water inlet 1a for the die in the stage of performing continuously die casting. The solenoid valves are opened and closed by the temp. controllers TH1-THn for the die 1. Continuous die casting operations C1-C4 consist respectively of a charging stage A1, a curing time A2, a product ejection and mold parting material coating stage A3 and a die clamping stage A4. The temp. of the die 1 right after the die claming stage A4 in each operation is measured. If the measured temp. is lower than a set die temp. 13 like P1, P2, the solenoid valves are closed by the temp. controllers to stop cooling of the die. If the temp. is higher than the set temp. 13 like P3, P4, the valves V1-Vn are adequately opened by the temp. controllers to pass the cooling water, thereby cooling the die 1 to the set temp. 13 or below.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a +i degree sub-control device for a mold for appropriately controlling the temperature of a mold used in die casting or the like.

Molds used for aluminum die-casting, zinc die-casting, etc. are usually sealed using a heating medium such as steam or oil, and are cooled using cooling water. The reason for this is that the simple A-A operation of the cooling water without using a heating medium provides coarse control units and cannot properly control the hot stone of the mold. However, in the above-mentioned conventional P-A, since the heating medium is heated at a high temperature of 100°C to 300°C, workers may suffer burns or other injuries when replacing molds, etc. For molds M and A, the heating medium is heated, and after the temperature of the mold is raised, it is cooled with cooling water, so there is a large energy loss, leading to a rise in both initial cost and running cost. cause problems. Furthermore, when oil is used as the heating medium, the flow path for the heating medium and the flow path for the cooling water must be separate systems, so the equipment configuration becomes duplex 7 and the mold itself receives This has the disadvantage of increasing restrictions.

In addition, in order to prevent multi-phase equipment configurations, there are some systems that manually control the cooling water, but in such equipment, cooling water control is largely dependent on the intuition of the operator.
As a result, problems arise in that control stability and reproducibility are lacking.

Furthermore, by detecting the mold temperature and issuing an opening/closing signal to the solenoid valve, and by using an electric valve inserted in the cooling water passage, the mold can be heated without using a heating medium. Although there are devices that perform temperature control, in such conventional devices, even if the mold temperature changes during one casting cycle, the A-on-off operation of the cooling water supply is performed, so there is no problem with the rise in mold temperature. This results in a drawback that the effect of raising the temperature of the mold is low.

The purpose of the present invention is to be able to automatically control the temperature of the mold, achieve the requirements of energy saving and resource saving, and further reduce the occurrence of defective products due to low mold temperature. It is possible to cover the mold by providing a thirst control device.

The mold temperature control device of the present invention includes a plurality of solenoid valves arranged in parallel in a cooling water passage that connects and covers a cooling water supply source and a mold cooling water intake, and controls the opening and closing of each of these solenoid valves. By performing the operation based on the valve opening/closing signal issued by the control circuit,
Increase or decrease the amount of cooling water supplied to the mold in stages. Then, the control circuit compares the mold temperature at one predetermined measurement point during one casting cycle with the set temperature, and generates a valve opening/closing signal. Even if the mold temperature drops by 4 degrees, the color of the cold Ml water supplied is not affected in any way. 1. In other words, even if the mold temperature exceeds the set temperature at a point other than the measurement point in the Noikuru, the amount of cooling water supplied to the mold does not increase, so the temperature increase effect of the mold is Therefore, it is possible to increase the rate of rise in mold quality, thereby reducing the incidence of defective products due to low mold temperature. Conversely, even if the mold temperature falls below the set temperature at a point other than the measurement point during one casting cycle, the cooling water R supplied to the mold will not decrease. This will have a negative effect on the temperature increase effect. However, such adverse effects can be minimized by selecting the measurement point at the optimal position in the IPP mold, and the present invention also provides a method for reducing the temperature of the mold by squeezing the cooling water base when the mold temperature is low. This is because the amount of cooling water is controlled in stages, increasing the amount of cooling water as the mold temperature rises. ! ! number of casting sir f
When casting cycles are performed continuously, corrections are made at the measurement points of the next casting cycle, and the negative fFj is
There's nothing wrong with W.

Furthermore, as is clear from the above description, the present invention controls the temperature of the mold only by stepwise control of the amount of cooling water without using a heating medium, so it is better than one that uses a heating medium. On the other hand, it is highly safe, has low initial production costs and low running costs, and contributes to energy savings and liability savings.

Below, one embodiment of the present invention will be described based on the drawings.

The cooling water intake port 1a of the mold 1 is connected to a cooling water supply source 3 via a cooling water passage 2, and the cooling water passage 2 is provided with a solenoid valve ■1,
(2) 2, . . . V 11 are interposed in parallel with each other.

Solenoid valves V1, ■2, ...Vn are each solenoid 8
0m+, 801-2, . . . are driven to open and close by S Q L 11. The cooling water passage 2 also has a variable throttle 0.
1.02,...01) is electric FjlftV + ,V
2,=-Vn are respectively interposed in series, and variable throttle O+, 02...0"1 is a solenoid valve V+, respectively.
, V2...Controls the amount of cooling water flowing out from Vn.

On the other hand, a temperature detector 4 such as a thermocouple or a resistance temperature detector is attached to the mold 1, and the temperature detector 4 is connected to a temperature controller Tt via a converter 5 such as a thermoelectric temperature converter or a resistance temperature converter.
-1+, TH2,...J1'']). These humidity controllers Tfl+, TI-Le, -Tf-I
n is the solenoid SQL +, 5OL2, -, respectively.
5oLn in one-to-one relationship, temperature control cutting TH1
, TH2, ...THn and solenoid SQL +,
5OL2 and -8OshiI) are each controlled by a control circuit as shown in FIG.

Figure 2 shows the temperature controller T t-1t and the solenoid 5O.
A control circuit when Li is typically used is shown. Other temperature controllers and solenoids are also connected using a similar control circuit. In Figure 2, 6.7.8.9 are auxiliary relays,
6a is the a contact of the auxiliary relay 6, 61) is the b contact of the auxiliary relay 6, 7a is the a contact of the auxiliary Ill electric device 7, 8a is the a contact of the auxiliary NWi device 8, 9a and 9a' are the auxiliary relay 9
The a contact point is shown. In the figure, 10 is the measurement point P1,
These are switches that are turned on and off depending on conditions such as mold clamping to determine P2, . . . P5, and 11 is a switch that issues a signal when the cycle time exceeds.

The action will be explained below.

In FIG. 1, 12 is each casting cycle C1, 02C3
, 04. Taking the casting cycle C2 of 1 as an example, this old I cycle C2 has a pouring process Δ, curing time Δ2, φj1 product removal and mold release agent application process. It consists of Δ3 and mold clamping process Δ4.

And ゛, the measurement point P2 of the old 1 nicle C2 is determined at the time before q after mold matching, and the measurement point P2 of the old 1 nicle C2 is determined at the time before q, and the measurement point P2 of the old 1 nicle C2 is determined at the time before q,
, C4 measurement point P1. P3. P4 is also determined at a similar point. Measurement point P5 is significant as the end point of casting cycle C4. Further, in FIG. 1, 13 indicates the set temperature of the mold 1.

Measurement point P3 of casting cycle C3 and casting cycle C4
When the temperature of the mold 1 exceeds the set temperature 13, as at measurement point P4, the contact of the thirst control WS BITHi is turned on, and the auxiliary relay 6 is activated 1! be done. As a result, the a contact 6a of the auxiliary relay 6 is turned on, so if the conditions for determining the mold temperature measurement points P3 and P4 are met, the switch 10 is turned on and the auxiliary TF&M device 7 is turned on. is excited. If the auxiliary relay 7 is energized, -te-a
Contact 7a is turned on, and at this time, if the cycle time has not exceeded, auxiliary relay 9 is magnetized. As a result, the a contact 9a' of the auxiliary relay 9 turns on, and the a
While maintaining the contact 7a in the on state, the a contact 9a
turns on, solenoid 5OLi operates and solenoid valve V
t opens. Therefore, the cooling water flows into the mold 1 through the lightning F1 valve 1 and the variable throttle 01.

Next, when the temperature of the mold 1 is lower than the set temperature 13, as at measurement points P1 and 69 of the casting cycle C2, the b contact is 6b is turned on, and the auxiliary relay 8 is energized. When the auxiliary relay 8 is energized, its a contact (normally closed contact) 8a is turned off, and the auxiliary relay 9 is not energized. Therefore, solenoid SQL+ is not activated and no cooling water is supplied.

Then, when the casting 4 Noise C4, in which cold H1 water is supplied to the mold 1, reaches the end and reaches the next measurement point P5, the switch 11 is turned off because the 1 Noise time has exceeded. , the auxiliary relay 9 is de-energized.

Therefore, the a contact 9a is turned off, and the solenoid SQ
L+ causes solenoid valve V+ to close.

As explained above, according to the mold temperature control device of the present invention, one optimal point during one tsuba-making "cycle" is determined as a measurement point, and the mold temperature at this measurement point is measured. Since the cooling water is turned on and off based on
Even if the mold temperature rises or falls at a point other than the measurement point during the casting cycle, the cooling water is not turned on or off.

Therefore, when the mold temperature at the measuring point is below the set temperature, no cooling water is supplied to the It'IN'J cycle, and the wetting effect of the mold is not impaired. As a result, the rate of mold temperature can be increased, which has the effect of reducing the incidence of defective products due to low mold temperature.

Additionally, if the mold moisture level at the measurement point is higher than the set temperature, cooling water is supplied to control the mold temperature, but the amount of cooling water supplied is controlled in stages. The optimum amount of cooling water can be supplied for the mold temperature at the time. Therefore, the temperature control of the mold is carried out very appropriately, and the effect of saving 1 f yen is achieved.

Furthermore, since the temperature control of the mold according to the present invention is carried out by using only cooling water without using a heating medium, it is extremely safe, and running costs l~ and initials l~ are reduced, resulting in savings. It can contribute to energy and resource saving.

Furthermore, since the mold temperature control according to the present invention does not use cooling water and a heating medium in combination, the piping system is simple and the degree of freedom in mold design is significantly increased.

[Brief explanation of the drawing]

FIG. 1 is a mold temperature characteristic diagram, FIG. 2 is a control circuit diagram used in the present invention, and FIG. 3 is a schematic side view showing the overall configuration of the present invention. It is. 1...Mold 1a...Cooling water intake 2...Cooling water passage 3...Cold N1 water supply source 4...Temperature detector 5...Converter 6, a, 8.9...Auxiliary relay (3a ,
(3b, 7a, 8a, 9a, 9a'---Contacts Tti+, Tl-12,...Ttin...
...Concentration adjustment 81V1, V2, ...vn...
・・・・・・Mido 1 valve SQL+ N 5OL2 ,・
...S OL n...Solenoid 01.02,...On...Variable aperture n
fF Applicant 1 Heyota Automobile Co., Ltd. Figure 1 Figure 2 Figure 3 Proceeding amendment December 9, 1981 Commissioner of the Patent Office Sir 1. Indication of the case 1988 Patent Application No. 191878 2. Title of the invention Mold temperature control device 3, relationship with the case of the person making the amendment Patent applicant address name (name) 1 ~ Scope of claims column 7 of Yota Jidosha Co., Ltd. specification, content of amendment as shown in attached sheet 2 , Claims (1) A plurality of electromagnetic valves, which are interposed in parallel with each other in a cooling water passage connecting a cooling water supply source and a cooling water intake of a mold; - predetermined 1 in cycle
A mold temperature control device comprising: a control circuit that compares the temperature of the mold at a measurement point with a set temperature and issues a valve opening/closing signal to each of the electromagnetic valves. (2) The gold temperature control device according to claim 1, wherein variable throttles are interposed in the cooling water passages in series with the solenoid valves. (3) The mold temperature control device according to claim 1, wherein the measurement point is determined after the molds are matched and before pouring. (5) The mold temperature control device according to claim 1, wherein the control circuit is a circuit that issues a valve closing signal even when the cycle time of the casting cycle has elapsed.

Claims (3)

[Claims] (1) Are the cooling water passages connected in parallel with each other connecting the cooling water supply source and the cooling water intake of the mold? jy number of solenoid valves, and a control circuit that compares the temperature of the mold at one predetermined measurement point in one H3mm vehicle with a set temperature and issues a valve opening/closing signal to each of the solenoid valves; A mold temperature control device comprising: (2) The mold temperature control device according to claim 1, wherein variable throttles are interposed in the cooling water passages in series with the solenoid valves. (3) Set the measurement point to the mold match of the mold! The mold temperature control device according to claim 1, which is determined later and at a time before (note) q. 2. The mold temperature control device according to claim 1, wherein the control circuit is a circuit that issues a valve closing signal even when the cycle time of the n-manufacturing cycle has elapsed.