JPH09277017A - Method for controlling preleveled supplying molten metal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stabilize and shorten a cycle time by shifting from a prelevel holding control to a molten metal supplying control and starting the supplying of molten metal into a sprue hole in a casting machine, such as die casting machine. SOLUTION: Previous to the starting of casting with the casting machine 27 of the die casting machine, etc., the molten metal 1 is received into a pressurizing type molten metal supplying furnace 17 from a furnace hole 12 and a furnace cover 13 is closed and the furnace is tightly sealed. When the pressure in the furnace becomes a preleveled reference furnace inner pressure stored in a molten metal supplying control device 5, the prelevel air exhaust valve A91 is closed, and the prelevel holding state is held. When the demand of the supplying of molten metal from the casting machine 27 outputs, a prelevel molten metal surface detecting sensor sliding mechanisms 19A, 19B slidingly shifting prelevel molten metal surface detecting sensor 18 in three steps are worked and further, retracted to one step molten metal supplying restracting position and shifted from the prelevel holding control to the molten metal supplying control to start the supplying of molten metal into the sprue hole in the casting machine 27 of the die casting machine, etc. By this method, the supplying of molten metal can stably be obtd. in a fixed time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for supplying molten metal stored in a heat-retaining furnace to a casting machine such as a die casting machine by pressurizing the melted metal with a gas into the heat-retaining furnace.

[0002]

2. Description of the Related Art Conventionally, various methods have been known as a method for supplying molten metal to a plunger sleeve of a casting machine such as a die or a die casting machine. For example, Japanese public account 51
-36704, JP60-152356, Actual opening 3-85.
156, Japanese Patent Publication 63-61110, JP-A-2-127955.
It is.

[0003] Each of these methods has a proven track record and has played a significant role in improving casting techniques in recent years.
However, a common weakness of these technologies is the frequency of maintenance or time loss in operation in a hot water supply pipe or at a joint with a die casting machine plunger sleeve due to deposition of an oxide thin film generated each time hot water is supplied.

Techniques for overcoming these weaknesses include Japanese Patent Publication No. 3-5903, Japanese Utility Model Laid-Open No. 2-140941, and Japanese Utility Model Publication No. 3-21.
812, actual opening 2-96599, and the like were invented, and further, Japanese Patent Application No. 4-160421 was invented. However, in these cases, although considerable effects were obtained, new maintenance weaknesses were generated and the frequency of maintenance was greatly improved, but it was satisfactory in view of the recent increase in the technical requirement level. It was a difficult stage, and a further breakthrough was required.

[0005] For example, in the case of the technology based on Japanese Patent Publication No. 3-5903, a new maintenance work of a hot water supply system and a newly provided hot water supply system has been devised, that is, the provision of a provided air supply box and an air supply opening / closing plug. Depending on the equipment position and precision, individual fragments or mixtures of oxides or molten metal solidified fragments generated even in minute amounts may bite into the air supply port opening / closing plug, and are inevitable maintenance due to problems with the drive mechanism in the air supply box. The problem is the difficulty of the work itself.

In addition, Japanese Utility Model Application No. 2-140941 or Japanese Utility Model No. 3-
If a hot water supply pipe based on the invention of No. 21812 is used, the mixture of oxide or molten metal solidified film generated in the hot water supply pipe is much less than that of the conventional hot water supply pipe, but the frequency of removal is still 2 in terms of maintenance. It is considered that it is difficult to be satisfied, and it is considered that they are supplied to the casting machine side such as a die-casting machine plunger sleeve as a different piece, leading to the occurrence of defective castings. It was a difficult stage to see from the viewpoint.

The further advanced invention of Japanese Patent Application No. 4-160421 is disclosed in Japanese Utility Model Application Laid-Open No. 3-85156 and Japanese Patent Application Laid-Open No. 2-127555.
When combined with the above, the length of the hot water supply pipe provided by the combined structure of the die casting machine and the pressurized hot water supply furnace is increased, leading to an increase in the casting cycle, and there is a disadvantage that productivity inferiority cannot be denied. Taking these into consideration, as technologies that have been dramatically developed, there are Japanese Patent Application Laid-Open No. 6-155005 and Japanese Patent Application No. 6-251449, which are the inventions of the present inventors.

However, FIG. 3 shows in Japanese Patent Laid-Open No. 6-1550.
FIG. 6 is a conceptual diagram of a system configuration based on an example of a pre-level hot water supply control method based on 05.
In the case of the invention based on Japanese Patent Application No. 6-251449, a load cell is used as an important constituent element of the system. It is becoming an obstacle in developing results by combining them.

That is, in order to constantly measure the change in the weight of the furnace by using the load cell in the lower part of the pressurized hot water supply furnace, it is impossible to configure the peripheral structure such as the casting machine and the rigid structure, which naturally limits the configuration of the casting system. Occurs.

[0010]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and even in the case of an equipment configuration in which the length of the hot water supply pipe is long, it does not lead to extension during the casting cycle and high productivity can be secured. JP-A-155005 and Japanese Patent Application No. 6-155005 that realized a hot water supply method capable of ensuring high quality of casting products in the future.
It is an object of the present invention to achieve the same or higher result as the result of −251449 and to develop the result by combining with a wide range of casting machines without using a load cell.

[0011]

First, Japanese Patent Laid-Open No. 6-1550
05 and Japanese Patent Application No. 6-251449, the pressure in the furnace for maintaining the pre-level is calculated based on the stored amount of the molten metal in the pressurizing hot water supply furnace, which is measured by the load cell, as a basic means, and is set constant from this pre-level control value. Of the pressure in the furnace for maintaining the pre-level based on the stored amount of molten metal in the pressurizing type hot water supply furnace measured by the load cell in the method of maintaining the pressure in the furnace within the upper and lower limits of the width The process of setting is the measured value of the pressure inside the furnace at the pre-level reference point using the pre-level molten metal level detection sensor in the pre-level measurement chamber.

[0012] And, JP-A-6-155005 and Japanese Patent Application No. 6
As with 251449, it is difficult to prevent leakage of gas from the sealing surface of the pressurized hot water supply furnace as a completely sealed structure, so the lower limit of a certain width from the pre-level reference internal pressure, which is the measured value at the above-mentioned pre-level reference point. When the amount of leakage of the pressure in the furnace below is reached, the pressure in the furnace is maintained within a certain range by pressurizing by the pre-level pressurizing valve. Naturally, this pressurization is stopped when the pressure in the furnace reaches the pre-level reference furnace pressure.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS By implementing the means for solving these problems, the following effects are obtained. First, the measured value of the pressure in the pressurization type hot water supply furnace when the pre-level molten metal surface detection sensor detects molten metal at the pre-level reference point in the pre-level measurement chamber is taken into the hot water supply control device in the control panel and stored as the pre-level reference furnace internal pressure. As a result, the pressure in the furnace for pre-leveling the molten metal at a fixed position in the height direction of the hot water supply pipe can be obtained regardless of the amount of the molten metal stored in the furnace.

If the decrease in pressure inside the furnace due to gas leakage from the sealing surface of the pressurized hot water supply furnace reaches a leak amount outside the range of pressure within the furnace of a certain width, the pre-level pressurizing valve Since the pressurization is performed until the pre-level reference furnace internal pressure is reached, the pressure inside the furnace is maintained within a certain range corresponding to the amount of molten metal stored in the furnace, and as a result the pre-level molten metal surface is also maintained. .

[0015]

1 is a conceptual diagram of a system configuration based on an embodiment of a pre-level hot water supply control method based on claim 1 of the present invention, and FIG. 2 is an embodiment of a pre-level hot water supply control method based on claim 1 of the present invention. FIG. 3 is a conceptual diagram showing the behavior of the molten metal in the pressurized hot water supply furnace, but an embodiment of the pre-level hot water supply control method according to claim 1 of the present invention will be described below with reference to the drawings.

Prior to the start of the casting operation with the casting machine 27 such as a die casting machine, the furnace lid 13 is opened and the molten metal 1 is received from the furnace opening 12 into the pressurization type hot water supply furnace 17, and the furnace lid 13 is opened.
Close and seal.

If the conditions for starting the casting operation are adjusted, the start of the pre-level holding control is input and activated by a switch (not shown) on the control panel surface. Immediately, the pre-level melt level detection sensor two-stage slide air cylinder 19A that constitutes the pre-level melt level detection sensor slide mechanism is extended for the entire stroke, and the pre-level melt level detection sensor slide cylinder 19B is operated to the lower stroke end to pre-level melt level. The detection sensor 18 is moved from the hot water supply standby position to the pre-level air supply amount switching point, and the pre-level pressurizing valve A71 arranged in the conduit of the pressurizing conduit 8 connected to an external pressurizing source (not shown) is opened. Pressurized gas is supplied from an external pressurizing source (not shown) into the pressurizing hot water supply furnace 17, the pressure in the pressurizing hot water supply furnace 17 rises, and the molten metal 1 flows in the hot water supply pipe 16 and the pre-level measuring chamber 21. As a result, the pressure rises and the pre-level initial pressurization shifts from the steady state in FIG.

The pressure in the pressurizing hot water supply furnace 17 rises, and the pre-level hot water level sensor 18 set at the pre-level air supply amount switching point in the pre-level initial pressurization in FIG. 2 rises in the pre-level measuring chamber 21. When the incoming molten metal 1 is detected, the above-mentioned entire stroke can be expanded and contracted in two steps. The pre-level metal level detection sensor two-stage slide air cylinder 19A immediately contracts one of the two levels to detect the pre-level metal level. The sensor 18 moves to the pre-level reference point and waits for the molten metal 1 rising again at the pre-level reference point. At the same time, the pre-level pressurization valve A71 is closed, and the supply amount of the hot water is supplied from the pre-level pressurization valve A71. The behavior of the molten metal 1 rising in the pipe 16 and the pre-level measurement chamber 21 is quiet and stable. Is a Purireberu pressure valve B72 which is arranged outside the pressurized conduit connected pressurized conduit 8 to pressure source not be opened.

If the pre-level molten metal level detection sensor 18 detects the rising metal melt 1 again at the pre-level molten metal level detecting point 18, the pre-level molten metal level detecting sensor two-stage slide air which constitutes the above-mentioned pre-level molten metal level detecting sensor slide mechanism. The cylinder 19A contracts one more step (full stroke contraction), the pre-level molten metal surface detection sensor 18 moves to the pre-level retracted position, and at the same time the pre-level pressurizing valve B72 is closed, and the pressure in the pressurized hot water supply furnace 17 at that time is measured by the pressure measuring conduit. A pre-level reference furnace internal pressure is stored in the hot water supply control device 5 via the controller 4.

Since the pressurized hot water supply furnace 17 has a completely sealed structure within a proper cost range and it is difficult to prevent gas from leaking from the sealing surface, it is inevitable from the sealing surface due to temperature conditions during use. Even if the amount is very small, the gas inside will leak out and the pressure in the furnace will drop. As a result, the pressure in the pressurized hot water supply furnace 17 falls below the lower limit value of a certain width of the pressure in the furnace for maintaining the pre-level calculated and set from the pre-level reference internal furnace pressure stored in the hot water supply control device 5. When the pressure in the furnace is reached, the pre-level pressurization valve B72 is opened again, and the pressure in the furnace is increased until the pressure in the furnace reaches the pre-level reference furnace pressure stored in the hot water supply control device 5. In this way, in the pre-level holding state in FIG. 2, opening and closing of the pre-level pressurizing valve B72 are repeated.

Even if the pre-level pressurizing valve B72 is closed, the pressure in the furnace rises for some reason, and the pre-level reference furnace pressure stored in the hot water supply controller 5 is used to maintain the pre-level calculated and set. When the pressure in the furnace exceeds the upper limit value of a certain width of the pressure, the pre-level exhaust valve A91 arranged in the conduit of the exhaust conduit 11 open to the atmosphere is opened. At this time, the exhaust speed of the gas discharged from the pre-level exhaust valve A91 is adjusted so that the molten metal 1 in the hot water supply pipe 16 and the pre-level measurement chamber 21 does not pulsate greatly and exhibits stable behavior.
When the pressure in the furnace again becomes the pre-level reference furnace pressure stored in the hot water supply control device 5, the pre-level exhaust valve A91 is closed.

When a casting machine 27 such as a die casting machine is ready and a hot water supply request command is issued from the casting machine 27 such as a die casting machine to a control panel (not shown), the pressurizing hot water supply furnace 17 holds the prelevel in FIG. From the state to the hot water supply state, the pre-level hot water level detection sensor slide air cylinder 19B is operated to the upper stroke end to move the pre-level hot water level detection sensor 18 to the hot water retreat position, and at the same time, the pre-level pressurization valve B7.
2 and the pre-level exhaust valve A91 are on standby for origin (both closed and waiting for command), and the pressurizing valve arranged in the conduit of the pressurizing conduit 8 connected to an external pressurizing source (not shown). 7 is opened, pressurized gas is supplied from a pressure source (not shown) into the pressurized hot water supply furnace 17, the pressure in the pressurized hot water supply furnace 17 rises, and the molten metal 1 flows into the hot water supply pipe 16 and the pre-level measurement chamber 21. The casting machine 2 such as a die casting machine rises from the pre-level holding state to the hot water supply state.
7 is supplied and supplied from a molten metal outlet 14 which is in contact with a hot water receiving port such as a plunger sleeve 7.

The quantitative control of the amount of hot water supply is known in Japanese Patent Publication 51-3.
The exhaust valve 9 is disposed by applying a proven control method such as 6704, and the pressurization of the pressurizing hot water supply furnace 17 by the pressurizing valve 7 is stopped, and the exhaust valve 9 is arranged in the conduit of the exhaust conduit 11 that is open to the atmosphere. Is opened and is performed accurately.

When the hot water supply control device 5 accurately supplies hot water to the casting machine 27 such as a die casting machine and the exhaust valve 9 is opened, the molten metal 1 in the hot water supply pipe 16 and the pre-level measuring chamber 21 is melted. Returns to the furnace.

Then, the pre-level molten metal surface detecting sensor slide air cylinder 19B constituting the pre-level molten metal surface detecting sensor slide mechanism is fully extended, and the pre-level molten metal surface detecting sensor slide air cylinder 19B is moved downward at the stroke end. Until the pre-level supply level switching point is moved to the hot water retreat position at the pre-level supply level switching point, the pre-level supply level switching point is moved to the pre-level supply level switching point, and the standby state is resumed at that position. Return to.

In order for the molten metal 1 in the hot water supply pipe 16 and in the pre-level measuring chamber 21 to be quickly held again at the pre-level reference point without completely returning to the furnace, the exhaust valve 9 is opened to individual hot water supply conditions. The pre-level pressurizing valve A71 is opened again to pressurize the inside of the pressurizing type hot water supply furnace 17, and a series of automatic control from the pre-level initial pressurization is repeated. .

At this time, if the molten metal 1 is detected in the process of moving the pre-level molten metal surface detection sensor 18 to the pre-level air supply amount switching point which is performed in parallel at the same time, the pressurization of the pressurizing hot water supply furnace 17 is not performed. The pre-level pressurizing valve A71 is immediately switched to the pre-level pressurizing valve B72, and at the same time, the pre-level molten steel surface detection sensor 18 is also moved to the pre-level reference point.

In this way, the pre-level holding control and the hot water supply control based on the hot water supply request command from the casting machine 27 such as a die casting machine are repeated, and when the stored amount of the molten metal 1 in the pressurizing type hot water supply furnace 17 becomes equal to or less than the appropriate amount, the metal Since the molten metal replenishment request is issued from the control panel (not shown) of the pressurization type hot water supply furnace 17, the external molten metal is replenished from the furnace opening 12 as described above, and the pre-level holding control and the hot water supply control are repeated again.

However, after the hot water supply to the casting machine 27 such as the die casting machine is completed based on the hot water supply request from the casting machine 27 such as the die casting machine, the exhaust valve 9 is opened to reduce the pressure in the furnace, and the inside of the hot water supply pipe 16 is reduced. When the molten metal 1 in the pre-level measurement chamber 21 returns to the furnace, the exhaust valve 9 is closed and the pre-level holding control is performed again. When the operation for holding the pre level is repeated, the die casting machine The molten metal 1 in the hot water supply pipe 16 and the pre-level measuring chamber 21 shows a subtle pulsation from the conditions such as the amount of hot water supplied to the casting machine 27 and the exhaust speed from the exhaust valve 9, and the pre-level molten metal surface detection at the pre-level reference point The sensor 18 does not properly detect the molten metal 1 (that is, as a result, the pre-level reference furnace inside the hot water supply control device 5 is stored). There is not the aptitude.) That there is.

In such a case, it is effective to use the pre-level hot water supply control method according to claim 2 of the present invention.
Similarly to the description of the embodiment of the pre-level hot water supply control method according to claim 1 of the present application, the pre-level hot water supply control method according to claim 2 of the present application will be described with reference to FIGS. 1 and 2.
Since the contents of paragraphs 0016 to 0024 in the description of the embodiment of the pre-level hot water supply control method according to claim 1 of the present application are also applicable to claim 2 of the present application, paragraph 0024 is applicable.
Subsequently, an embodiment of the pre-level hot water supply control method according to claim 2 of the present invention will be described.

In order for the molten metal 1 in the hot water supply pipe 16 and in the pre-level measuring chamber 21 to be quickly held again at the pre-level reference point without completely returning to the furnace, the exhaust valve 9 is opened from 0.5 seconds after opening. It closes in 1 second, shifts to the pre-level holding control again, and the operation for holding the pre-level is restarted.

At this time, until the time individually determined based on the combination condition of the pressurizing type hot water supply furnace 17 and the casting machine 27 such as the die casting machine, within 5 to 20 seconds after restarting the pre-level holding control, The pre-level reference furnace internal pressure stored in the hot water supply control device 5 used for the control for holding the pre-level to supply hot water to the casting machine 27 such as the immediately preceding die casting machine is set to the pre-level reference of the pre-level holding control. Used as the furnace pressure.

Hot water supply pipe 16 during the pre-level holding control described above.
Since the subtle pulsation of the molten metal 1 in the inside and the pre-level measurement chamber 21 is calmed down, the pre-level molten metal surface detection sensor 18 is moved from the hot water supply standby position to the pre-level reference point immediately after the lapse of the determined time. The pressurizing valve B72 is opened, the pressurizing type hot water supply furnace 17 is pressurized, the molten metal 1 in the pre-level measuring chamber 21 rises, and it is detected by the pre-level molten metal surface detection sensor 18 standing by at the pre-level reference point.

When the pre-level molten metal level detecting sensor 18 detects the rising metal melt 1 at the pre-level reference point, the pre-level molten metal level detecting sensor two-stage slide air cylinder constituting the above-mentioned pre-level molten metal level detecting sensor slide mechanism. 19A shortens the second stroke (all strokes are reduced), and the pre-level molten metal surface detection sensor 18 moves to the pre-level retracted position, and at the same time, the pre-level pressurizing valve B
72 is closed, and the pressure in the furnace at this time is set again as a new pre-level reference furnace pressure in the hot water supply control device 5, and thereafter the pre-level holding control is continued based on the new pre-level reference furnace pressure. It

Since the pressurized hot water supply furnace 17 has a completely sealed structure within a reasonable cost range and it is difficult to prevent gas from leaking from the sealing surface due to temperature conditions during use, it is inevitable that Even if the amount is very small, the gas inside will leak out and the pressure in the furnace will drop. As a result, a furnace in which the pressure in the pressurized hot water supply furnace 17 falls below the lower limit value of a certain width of the pressure in the furnace for maintaining the pre-level calculated and set from the new pre-level reference furnace internal pressure in the hot water supply control device 5 When the internal pressure is reached, the pre-level pressurizing valve B72 is opened again, and the inside of the furnace is pressurized until the new pre-level reference internal furnace pressure is reached. In this way, in the pre-level holding state in FIG. 2, opening and closing of the pre-level pressurizing valve B72 are repeated.

Also in this case, the pre-level pressurizing valve B
Even if 72 is closed, the pressure in the furnace rises for some reason, and the pressure in the furnace for maintaining the pre-level that is calculated and set from the new pre-level reference furnace pressure stored in the hot water supply controller 5 is kept constant. When the pressure in the furnace exceeds the upper limit value of the width of, the pre-level exhaust valve A91 arranged in the conduit of the exhaust conduit 11 open to the atmosphere is opened. At this time, the exhaust speed of the gas discharged from the pre-level exhaust valve A91 is adjusted so that the molten metal 1 in the hot water supply pipe 16 and the pre-level measurement chamber 21 does not pulsate greatly and exhibits stable behavior. When the internal pressure of the furnace again becomes the new pre-level reference internal furnace pressure stored in the hot water supply control device 5, the pre-level exhaust valve A91 is closed.

After that, a casting machine 27 such as a die casting machine is used.
Hot water supply is performed based on the hot water supply command from the same as the pre-level hot water supply control method according to claim 1 of the present application, and the pre-level holding control and hot water supply control to the casting machine are repeated based on the invention of claim 2 of the present application.

Incidentally, after restarting the pre-level holding control, 5
From 20 seconds to 20 seconds during the time (melting surface pulsation calming time) individually determined based on the combination condition of the pressurizing water heating furnace 17 and the casting machine 27 such as the die casting machine. In the pre-level holding control at the pre-level reference furnace pressure, which was used for the pre-level holding control for supplying hot water to the casting machine 27, the casting machine 27 such as a die casting machine is supplied with hot water once for the inside of the furnace. Since the storage amount of the molten metal 1 is reduced, the pre-level molten metal surface becomes lower than the pre-level reference point where the pre-level molten metal surface detection sensor 18 is set in the pre-level measurement chamber 21.

The length of the hot water supply pipe 16 provided by the combined structure of the casting machine 27 such as a die casting machine and the pressurization type hot water supply furnace 17 becomes long, so that depending on the length, the hot water supply pipe 1
When the risk of the molten metal 1 in 6 being cooled and solidifying increases, the outside of the hot water supply pipe 16 may be forcibly heated.
As an equipment for heating the outside of the hot water supply pipe 16, a heating element is provided inside the ceramic fiber molded body having both heat resistance and heat insulation effects from the surrounding environment of the hot water supply pipe 16, that is, near the hot water inlet of a casting machine such as a die casting machine. The structure with embedded is effective.

Japanese Patent Publication No. 4-45262 discloses a pre-level control similar in purpose and effect to the present invention. However, complicated control is required by using various expensive and complicated equipment such as a positioner solenoid valve. Therefore, even if it can be applied to the casting of special metal, which is costly even if it is established as a large-scale facility, it is an inexpensive aluminum casting that can be mass-produced in large quantities, such as automobiles and low-voltage electricity. However, it is difficult to apply it to the present invention in terms of cost, and it is not practical to substitute the present invention.

[0041]

[Effects of the Invention] Without using the hot water supply method as in the invention of JP-A-2-127955, the molten metal flowing out from the hot water supply pipe which is now popular is supplied to the plunger sleeve or the like of the die casting machine through the gutter. Also in the hot water supply method, if the pre-level holding control method according to the present invention is used, the effect of stabilizing and shortening the cycle time in the casting process is extremely large.

According to the present invention, the pressure in the furnace for maintaining the pre-level is set based on the measured value of the pressure in the pressurizing type hot water supply furnace at the pre-level reference point by using the pre-level molten metal level detection sensor in the pre-level measuring chamber without using the load cell. Since the calculation can be set, the molten metal can be held at a pre-level within a certain width in the height direction of the hot water supply pipe regardless of the amount of the molten metal stored in the furnace, and it can be supplied from a casting machine such as a die casting machine. If a demand command was issued, it became possible to stably and quickly supply the molten metal in a fixed time.

If the amount of gas leaked from the sealing surface of the pressurizing hot water supply furnace reaches a leak amount outside the range of a certain width, the pressurization by the pre-level pressurizing valve is performed up to the pre-level reference furnace internal pressure. If the sealing performance and airtightness are maintained within the normal quality control range, stable pressurization type hot water furnace functions and high quality die casting production can be realized.

Japanese Patent Application Laid-Open No. 6-155005 by the present inventors
The method of suppressing the generation of oxides due to the supply of the inert gas around the hot water supply pipe used in claims 2 and 4 can naturally be applied when the method of the present invention is carried out. However, even if the supply of the inert gas is not utilized, essentially maintaining the pre-level of the molten metal in the hot water supply pipe is performed between the hot water supply pipe on the surface of the molten metal in contact with the outside air and the pressurized hot water supply furnace. It has an effect of suppressing the generation amount of the oxide thin film by reducing the opportunity and the absolute surface area of the oxide thin film generation due to traffic.

Thus, according to the present invention, even in the case of an equipment configuration in which the length of the hot water supply pipe is long, high productivity can be secured without extension during the casting cycle, and high quality casting products can be secured in the future. It can be applied to the laminar flow die casting method in which the molten metal is directly supplied from the lower part of the die casting machine plunger sleeve such as electromagnetic pump type or pneumatic type, but it is possible to achieve much cheaper and more stable production and to maintain it. A hot water supply method with much less opportunity loss has been realized.

[Brief description of drawings]

FIG. 1 is a conceptual diagram of a system configuration based on an embodiment of a pre-level hot water supply control method according to claim 1 of the present invention.

FIG. 2 is a conceptual diagram showing the behavior of the molten metal in the pressurizing hot water supply furnace based on an embodiment of the pre-level hot water supply control method according to claim 1 of the present invention.

FIG. 3 is a conceptual diagram of a system configuration based on an embodiment of a pre-level hot water supply control method based on JP-A-6-155005.

[Explanation of symbols]

1 Metal Molten 2 Heat Source 3 Pressure Measuring Port 4 Pressure Measuring Conduit 5 Hot Water Supply Control Device 6 Pressurizing Port 7 Pressurizing Valve 8 Pressurizing Conduit 9 Exhaust Valve 10 Exhaust Port 11 Exhaust Conduit 12 Furnace 13 Furnace Top 14 Molten Metal Outlet 15 Molten Metal Inlet 16 Hot water supply pipe 17 Pressurized hot water supply furnace 18 Pre-level hot water detection sensor 19A Pre-level hot water detection sensor Two-stage slide air cylinder 19B Pre-level hot water detection sensor Slide air cylinder (rodless cylinder) 20 Pre-level hot water detection sensor Slide air cylinder Mounting column 21 Pre-level measuring chamber 22 Load cell 26 Pre-level measuring chamber lid 27 Casting machine 71 Pre-level pressurizing valve A 72 Pre-level pressurizing valve B 81 Molten metal outlet 82 Molten metal sensor 83 Plunger sleeve 91 Pre-level exhaust valve A

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] May 22, 1996

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0018

[Correction method] Change

[Correction contents]

The pressure in the pressurizing hot water supply furnace 17 rises, and the pre-level hot water level sensor 18 set at the pre-level air supply amount switching point in the pre-level initial pressurization in FIG. 2 rises in the pre-level measuring chamber 21. When the incoming molten metal 1 is detected, the above-mentioned entire stroke can be expanded and contracted in two steps. The pre-level metal level detection sensor two-stage slide air cylinder 19A immediately contracts one of the two levels to detect the pre-level metal level. The sensor 18 moves to the pre-level reference point and waits for the molten metal 1 rising again at the pre-level reference point. At the same time, the pre-level pressurizing valve A71 is closed and the supply amount of air from the pre-level pressurizing valve A71 is higher than that of the hot water supply pipe. 16 shows that the behavior of the molten metal 1 rising in 16 and in the pre-level measurement chamber 21 is quiet and stable. Outside the pressure source is not disposed in the conduit of the connected pressurized conduit 8 Purireberu pressure valve B
Open 72.

[Procedure amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] 0025

[Correction method] Change

[Correction contents]

Then, the pre-level molten metal surface detecting sensor slide air cylinder 19B constituting the pre-level molten metal surface detecting sensor slide mechanism is fully extended, and the pre-level molten metal surface detecting sensor slide air cylinder 19B is moved downward at the stroke end. Works up to
Then, the pre-level hot water level detection sensor 18 that has been moved to the hot water retreat position is moved to the pre-level air supply amount switching point, and returns to the pre-level initial pressurization to wait at that position again.

Claims (2)

[Claims] 1. A molten metal is stored, a heat source is provided for keeping the temperature of the stored molten metal constant, and the lower part of the opening is immersed in the stored molten metal to communicate the upper part of the opening with the atmosphere. It is opened as much as possible and a pre-level measuring chamber lid is attached to the upper part, and a pre-level molten metal level detection sensor for detecting the arrival of the molten metal is installed inside, and the pre-level molten metal level detection sensor is slid in three steps. Pre-level metal level detection sensor slide mechanism A ceramic pre-level measurement chamber attached to the pre-level metal level detection sensor slide mechanism mounting column located above the furnace body is equipped with a pressure measurement port for pressure measurement. It is connected to a hot water supply control device inside the control panel that can optimally control the amount of hot water supplied to the outside of the metal melt stored via a conduit under appropriate pressure conditions, and has a pressurizing port. Via a pressurizing conduit having a pressurizing valve, a pre-level pressurizing valve A and a pre-level pressurizing valve B, which can be respectively closed by signals from the hot water supply control device via three juxtaposed pipe lines. An exhaust valve and a pre-level exhaust valve A, which are connected to an external pressure source and connected to the exhaust port, and which can open the pipes juxtaposed in parallel to the atmosphere by a signal from the hot water supply control device. It has an exhaust pipe, a furnace port for replenishing the metal melt from the outside and cleaning the inside, and a furnace lid that can seal the furnace port, and supplies the stored metal melt to the hot water inlet of the casting machine. In the pressurizing type hot water furnace having a hot water supply pipe having a molten metal inlet in the molten metal stored in contact with the molten metal outlet of the casting machine Hot water in casting machine In a method of supplying molten metal to supply water to an outlet, a die casting is repeatedly performed by the two pre-level pressurizing valves A, the pre-level pressurizing valves B, the pre-level exhaust valves A, the pressurizing valves and the exhaust valves. During continuous operation of supplying molten metal to a casting machine such as a machine, except when the molten metal is actually supplied from the molten metal outlet of the hot water supply pipe to the casting machine such as a die casting machine through the hot water supply pipe. By opening the above-mentioned pre-level pressurizing valve A arranged in the conduit of the pressurizing conduit connected to the pressurizing source, pressurized gas is supplied from the pressurizing source into the furnace, and the pressure in the furnace rises. , The metal melt stored in the furnace rises in the hot water supply pipe and the pre-level measurement chamber, and the pre-level is set at the pre-level supply amount switching point which is the initial position in advance. If the surface detection sensor detects rising metal melt, it can be slid in three steps as described above. Pre-level metal surface detection sensor slide mechanism is operated to retract one level from the pre-level air supply volume switching point. The pre-level pressurizing valve A is closed while being set to the reference point, and the behavior of the molten metal whose air supply amount rises from the pre-level pressurizing valve A in the hot water supply pipe and the pre-level measuring chamber is quiet and stable. The pre-level pressurizing valve B arranged in the conduit of the pressurizing conduit connected to the external pressurizing source is opened, and further the molten metal continues to rise in the hot water supply pipe and the pre-level measuring chamber,
Eventually, it is detected again by the pre-level molten metal surface detection sensor set at the pre-level reference point,
The pressure in the pressurized hot water supply furnace at this time is stored in the hot water supply control device in the control panel as the pre-level reference internal furnace pressure, and at the same time, the pre-level pressurization valve B is closed to stop the rise of the molten metal and The surface detection sensor again operates the pre-level molten metal surface detection sensor slide mechanism that can be slid in the above three steps to retract it to the pre-level retracted position. Since it is difficult to completely prevent the leakage of gas from the seal surface of the pressurized hot water supply furnace during use, the gas inside leaks from the seal surface inevitably even if it is a trace amount from the seal surface. Decrease,
As a result, a furnace in which the pressure in the pressurized hot water supply furnace is lower than the lower limit value of a certain width of the pressure in the furnace for maintaining the pre-level calculated from the pre-level reference internal furnace pressure stored in the hot water supply control device is set. When the internal pressure is reached, the pre-level pressurizing valve B is opened again, the pre-level reference internal furnace pressure is increased, and the pre-level holding state is maintained by closing the pre-level pressurizing valve B. And closing is repeated. The pre-level pressurizing valve B
Even if it is closed, the pressure inside the furnace will rise for some reason,
The pre-level exhaust valve A is opened when the pressure in the furnace exceeds the upper limit value of the pressure for maintaining the pre-level calculated and set from the pre-level reference furnace internal pressure stored in the hot water supply control device. The pressure inside the furnace is exhausted,
The exhaust speed of the pressure in the furnace from the pre-level exhaust valve A is adjusted so that the molten metal in the hot water supply pipe and the pre-level measurement chamber exhibits a stable behavior without large pulsation, and the pressure in the furnace is again adjusted to the above-mentioned value. When the pre-level reference reactor internal pressure stored in the hot water supply control device is reached, the pre-level holding state is maintained by closing the pre-level exhaust valve A. If a hot water supply request is issued from a casting machine such as a die casting machine, the pre-level metal level detection sensor slide mechanism that can slide the pre-level metal level detection sensor in three steps is operated and further retracted to the hot water retreat position. A pre-level hot water supply control method, characterized in that the hot water supply control is started and the hot water supply control is started to start hot water supply to a hot water inlet of a casting machine such as a die casting machine. 2. The pre-level hot water supply control method according to claim 1, wherein water is supplied to a casting machine such as a die casting machine based on a hot water supply request from a casting machine such as a die casting machine due to time constraints such as cycle time as a casting process. Immediately after the completion of the above, the exhaust valve is opened to reduce the pressure in the furnace, and the exhaust valve is closed and the pre-level is held again during the process of the molten metal in the hot water supply pipe and in the pre-level measurement chamber returning to the furnace. When the control is repeated and the operation for maintaining the pre-level holding state is repeated, the molten metal in the hot water supply pipe and the pre-level measurement chamber shows a slight pulsation depending on the exhaust speed of the pressure in the furnace by the exhaust valve, and the pre-level at the pre-level reference point If the molten metal detection sensor does not detect the molten metal properly,
Except for the first pre-level holding control that starts continuous operation of supplying molten metal to a casting machine such as a die casting machine repeatedly, the pre-level metal level detection sensor detected the rising metal in the pre-level measurement chamber at the pre-level reference point. Instead of storing the instantaneous pressure in the pressurized hot water supply furnace as the pre-level reference internal furnace pressure in the hot water supply control device in the control panel and performing control, immediately before the pre-level control is restarted until 5 to 20 seconds have elapsed. The pre-level reference control internal pressure used for the pre-level retention control that was performed until the transition to the hot water supply control to the casting machine such as the die casting machine is used to perform the pre-level retention control.
After a lapse of time that is individually determined based on the combination conditions of the pressurized hot water supply furnace and the casting machine such as a die casting machine, the pre-level level sensor is slid from the hot water retreat position and set to the pre-level reference point. If the pre-level metal level sensor set at the pre-level reference point detects the molten metal rising in the pre-level measurement chamber by opening the pressurizing valve B, the pressure in the pressurizing hot water supply furnace at that time is determined again. A pre-level hot water supply control method characterized by resetting the internal pressure.