JPH1157970A - Device for coating releasing agent - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the contamination of working environment caused by scattering of a parting agent into the surroundings at the time of coating the parting agent on the inner peripheral surface of a sleeve for pressurizing molten to execute a high pressure casting. SOLUTION: A cupped cover 21 is arranged so as to cover an opening hole end of a sleeve 10 to be coated with the parting agent, and a spraying nozzle 23 for coating the parting agent and an air nozzle 24 for blowing off the excess parting agent are fitted so as to penetrate the center part of this cover 21, and this cover 21 is connected with a dust collector through a suction hole 36 and a suction duct 37.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a release agent applying apparatus, and more particularly to a release agent applying apparatus which applies a release agent to an inner peripheral surface of a sleeve for pressurizing a molten metal by a spray nozzle. About.

[0002]

2. Description of the Related Art When performing various castings with aluminum alloys, high-pressure casting or molten forging is widely used to improve the quality of castings. In the high-pressure casting, a molten metal is pressurized by a sleeve having a sliding plunger and pressure is applied into a cavity of a mold to perform casting, and a good casting without casting defects can be obtained.

When performing such high-pressure casting, for example, a molten metal of an aluminum alloy is poured into a sleeve 2 in which a plunger 1 as shown in FIG. 4 is slidably combined, and the plunger 1 is advanced. The molten metal of the aluminum alloy in the sleeve 2 is poured into a mold cavity (not shown) and pressurized.

[0004] A release agent is previously applied to the inner peripheral surface of a sleeve 2 used for pressurizing the molten aluminum alloy for high-pressure casting by a spray nozzle 3. When the molten aluminum alloy is pushed up, galling between the inner peripheral surface of the sleeve 2 and the outer peripheral surface of the plunger 1 is prevented by the applied release agent.

[0005]

When the mold release agent is applied to the sleeve 2 by the spray nozzle 3 prior to the injection of the molten metal, or when air is blown by the air nozzle 4, the upper portion of the sleeve 2 shown in FIG. A large amount of release agent scatters from the side opening. Therefore, measures such as providing an open-to-atmosphere dust collector above the opening of the sleeve 2 are taken. However, such open-to-atmosphere dust collectors, despite their expensive equipment, are not very effective in collecting dust.
There is a problem that the working environment deteriorates.

In addition, the release agent is not effectively applied to the inner peripheral surface of the sleeve 2, so that the application rate of the release agent is low, and the scattered release agent is wasted, or the consumption of the release agent increases. There is a problem to do.

Furthermore, the scattered release agent adheres and accumulates on peripheral mechanical devices, causing malfunctions of these mechanical devices. Generally, the release agent is one in which graphite is dispersed in water with a dispersant.However, since graphite itself has electrical conductivity, an electric furnace or the like may cause an electric leakage accident, and there is a problem in safety. there were.

The spray of the release agent from the release agent spray nozzle 3 and the injection of the compressed air from the air nozzle 4 are controlled by a valve not shown in FIG. Because of the long distance between the spray nozzle 3 and the release agent remaining in the spray nozzle 3 or in the middle of the pipe even after the valve is closed, dripping occurs later as shown in FIG. Molding agent is a sleeve for pressurizing molten metal 2
The metal is poured while being adhered to the inner peripheral surface of the metal, and such a release agent is mixed into the molten metal, thereby deteriorating the quality of the product. Such a structure also causes a malfunction of the plunger 1 sliding in the sleeve 2.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and does not cause the release agent to scatter around the opening of the sleeve. It is an object of the present invention to provide a release agent applying device that prevents a problem or that prevents a release agent from dripping from a spray nozzle after injection of the release agent.

[0010]

According to the present invention, there is provided a release agent applying apparatus for applying a release agent to an inner peripheral surface of a sleeve for pressurizing a molten metal by a spray nozzle. Arrange the cover to cover the
The present invention relates to a release agent applying device wherein the cover is connected to a dust collector.

[0011] The cover may be cup-shaped and mounted so as to cover an open end of the sleeve, and the spray nozzle may be attached to the cover so as to pass through a substantially central portion of the cover. Further, an air nozzle may be arranged so as to be juxtaposed with the spray nozzle, and the air nozzle may be attached to the cover. Alternatively, a valve for controlling the injection of the release agent by the spray nozzle may be attached to the outside of the cover.

[0012]

1 and 2 show a release agent applying apparatus according to one embodiment of the present invention. For example, an apparatus for pressurizing an aluminum alloy to perform high-pressure casting or molten forging. The sleeve 10 is configured such that a plunger 11 for pressing the molten metal injected therein is slidably fitted. A step 12 is formed at the lower end of the outer peripheral portion of the sleeve 10.
A cooling jacket 13 is mounted on the step 12. The cooling jacket 13 is connected to an air tank 15 via an air pipe 14. A control valve 16 is connected in the middle of the air pipe 14.

Further, another step 20 having a small diameter is formed on the outer peripheral surface of the sleeve 10 in which the plunger 11 is fitted and above the step 12. The step 20 has a cover. 21 are fitted. The cover 21 has an upper surface plate 22, and a spray nozzle 23 and an air nozzle 24 are attached to the inside of the cover 21 so as to protrude through a substantially central portion of the upper surface plate 22.

A nozzle block 26 is fixed above the upper plate 22 of the cover 21, and a release agent injection control valve 28 to which a release agent supply pipe 27 is connected is mounted on the nozzle block 26. ing. This control valve 2 is used to control the release agent injection control valve 28.
8 is connected to air pipes 29 and 30. The air pipes 29 and 30 are connected to the solenoid valve 31. Further, control valves 32 and 33 are attached to the pipes of the extended portions which extend upward through the upper plate 22 of the cover 21 of the spray nozzle 23 and the air nozzle 24, respectively.

The upper right plate of the upper cover 2
A suction hole 36 is provided at a position corresponding to the peripheral edge of the suction duct 3.
7 are provided. The suction duct 37 is connected to a dust collector 38.

Next, the operation of applying a release agent by such a release agent application device will be described. The application of the release agent is performed during a period after the injection of the molten metal in one cycle and before the injection of the molten metal in the next cycle. At this time, since the temperature of the sleeve 10 has been increased by the injection of the molten metal in the previous cycle, the control valve 16 is opened to allow air to flow from the air tank 15 to the cooling jacket 13 through the air pipe 14, thereby cooling the air. I do it.

The release agent is applied by lowering the cover 21 with respect to the sleeve 10 by means of a lifting means (not shown) as shown in FIGS. 1 and 2, and the lower end portion of the cover 21 is It starts in a state where it has moved to a position over the upper edge.

In the case of applying the release agent, the release agent injection control valve 28 is opened by the electromagnetic valve 31, and the control valve 32 provided at the upper end side of the spray nozzle 23 is opened. At a position corresponding to the inside of the block 26, the release agent supplied from the release agent supply pipe 27 is sucked by the spray nozzle 23, and a large number of such release agents are provided at the tip side of the spray nozzle 23. Spray vigorously from the small holes. Then, the release agent is applied to the inner peripheral surface of the sleeve 10.

The release agent used here may be, for example, a fine powder of graphite having an average particle size of 0.7 μm dispersed in water using a dispersant and an adhesive. Usually, the solid content is about 27% by weight, the viscosity is about 1 poise and the pH is 1
A water dispersion stock solution of a weak alkali of 0 (for example, a release agent manufactured by Nippon Graphite Industry Co., Ltd., Brohite 15Z-4C) is diluted and mixed about 10 times with water for use.

When a predetermined amount of the release agent has been applied, the control valve 32 and the solenoid valve 31 are closed. Solenoid valve 3
When 1 is closed, the release agent injection control valve 28 closes, whereby the suction of the release agent from the release agent supply pipe 27 also stops. And after this, the control valve 33 is opened,
Compressed air is blown from the air nozzle 24 toward the inner peripheral surface of the sleeve 10 to remove the release agent remaining on the inner peripheral surface of the sleeve 10 and excess release agent adhering to the inner peripheral surface of the sleeve 10. Try to blow it off.

Then, the release agent scatters inside the space inside the sleeve 10 and covered by the cover 21. The release agent thus scattered is sucked by the dust collector 38. That is, cover 2
The release agent in the sleeve 10 is removed by suction through the one suction hole 36 and the suction duct 37. Cover 2
Reference numeral 1 generally covers an upper opening of the sleeve 10 and is arranged with an appropriate gap kept between the upper end of the step portion 20 and the upper portion. Therefore, the suction by the dust collector 38 prevents the release agent from scattering around.

FIG. 3 shows, in order, the application of a release agent, the blowing of air, the injection of molten metal, and the pressurization of molten metal. A plunger 11 for filling and pressing the molten metal into the cavity of the mold 47 is slidably provided in the molten metal pressurizing sleeve 10 for high pressure casting as shown in FIG. 3A. Then, in order to prevent galling between the inner peripheral surface of the sleeve 10 and the outer peripheral surface of the plunger 11, a release agent is applied to the inner peripheral surface of the sleeve 10 as shown in FIG. 3A.

After performing a cycle of pressure coagulation,
Lower the plunger 11 in the pouring pressure sleeve 10,
Next, the entire sleeve 10 is separated from the casting mold 47. Then, the sleeve 10 is inclined in preparation for pouring the molten metal of the next cycle into the sleeve 10. Thereafter, as shown in FIG. 3A, the spray nozzle 23 and the air nozzle 24 are made to enter the sleeve 10, and the spray nozzle 2 is reciprocated appropriately in the central axis direction of the sleeve 10.
By 3, the release agent is sprayed and applied to the inner peripheral surface of the sleeve 10.

Immediately after the release agent is applied, the air nozzle 2
As shown in FIG. 4 to FIG. 3B, compressed air is blown toward the inner peripheral surface of the molten metal pressurizing sleeve 10 to adhere to the floating release agent remaining on the inner peripheral surface of the sleeve 10 and the inner peripheral surface of the sleeve 10. Blow off the excess or incompletely adhered release agent. Further, the excess release agent is sucked by the dust collector 38.
Then, as shown in FIG. 3C, the release agent spray nozzle 23 and the air nozzle 24 are retracted upward.

Next, the ladle 4 is placed in the molten metal pressurizing sleeve 10.
5, the molten metal 46 is injected as shown in FIG. 3C. Thereafter, the sleeve 10 is raised to an angle at which the sleeve 10 can be engaged with the casting mold 47, and then the sleeve 10 is moved upward so that the sleeve 10 shown in FIG.
As shown in D, it is engaged with the casting mold 47. Thereafter, the plunger 11 is raised to fill the molten metal in the sleeve 10 into the cavity of the casting mold 47 through the molten metal injection port 48, and is maintained in a pressurized state by the plunger 11 until it is solidified. To be performed.

According to the release agent applying apparatus, the upper opening of the sleeve 10 is covered with the cover 21 and the dust collector 3 is passed through the suction hole 36 and the suction duct 37.
8 makes it possible to apply the release agent while sucking it, so that the release agent does not scatter around,
The working environment has been greatly improved. In addition, a large dust collector that is open to the atmosphere is not required, and the purpose can be achieved by the small dust collector 38, so that the equipment cost is reduced.

According to such a release agent coating apparatus,
The release agent was not unnecessarily scattered around, the coating rate of the release agent was improved, and the consumption of the release agent was reduced.
According to the present embodiment, the amount of the release agent used is reduced by about 35%. As a result, a reduction in casting cost has been achieved by an amount corresponding to a reduction in the amount of use. In addition, the release agent is prevented from being scattered around, which prevents problems caused by the adhesion and deposition of the release agent on the surrounding machines, and the release agent may cause an electric leakage accident. Is gone.

In the release agent applying apparatus, a release agent injection control valve 28 is attached to a portion just above the cover 21 via a nozzle block 26, and the release agent injection control valve 28 and the spray nozzle Since the distance from the release agent 23 is very short, the release agent does not drip from the release agent spray nozzle 23 after the injection of the release agent is stopped, so that the quality of the casting is stable. And mechanical failures have been reduced.

[0029]

As described above, the present invention relates to a release agent applying apparatus which applies a release agent to the inner peripheral surface of a sleeve for pressurizing a molten metal by a spray nozzle. Is arranged so as to cover the cover, and the cover is connected to the dust collector.

Therefore, according to such a release agent application device, the release agent is prevented from being scattered to the outside, so that the work environment is deteriorated due to the scatter of the release agent and the surrounding machines are not affected. This makes it possible to prevent the adhesion and deposition, or to prevent the occurrence of a leakage fault. In addition, the application rate of the release agent is improved, and the consumption of the release agent is reduced.

According to the configuration in which the cover has a cup shape and is mounted so as to cover the open end of the sleeve, and the spray nozzle is attached to the cover so as to pass through a substantially central portion of the cover, Is introduced into the sleeve, the opening of the sleeve is automatically closed by the cover.

According to the structure in which the air nozzle is disposed so as to be juxtaposed with the spray nozzle and the air nozzle is attached to the cover, the air nozzle sprays air after the spray nozzle finishes the application of the release agent. Can be blown off.

According to the construction in which the valve for controlling the injection of the release agent by the spray nozzle is attached to the outside of the cover, the distance from the valve to the tip of the spray nozzle is shortened, and the release that remains in the spray nozzle is reduced. The amount of the agent is reduced, so that dripping after the application of the release agent by the spray nozzle is completed is prevented. Therefore, the deterioration of the quality of the casting and the malfunction of the plunger due to dripping are improved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing the overall configuration of a release agent coating device.

FIG. 2 is an enlarged vertical sectional view of a sleeve showing a state of application of a release agent.

FIG. 3 is a longitudinal cross-sectional view of a sleeve for sequentially explaining steps from application of a release agent to pressurization of a molten metal.

FIG. 4 is a longitudinal sectional view of a sleeve showing the application of a conventional release agent.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Plunger 2 Sleeve 3 Spray nozzle 4 Air nozzle 10 Sleeve 11 Plunger 12 Step 13 Cooling jacket 14 Air piping 15 Air tank 16 Control valve 20 Step 21 Cover 22 Top plate 23 Spray nozzle 24 Air nozzle 26 Nozzle block 27 Release agent supply pipe 28 Release Agent Injection Control Valve 29, 30 Air Pipe 31 Solenoid Valve 32, 33 Control Valve 36 Suction Hole 37 Suction Duct 38 Dust Collector 45 Ladle 46 Molten Metal 47 Casting Mold 48 Molten Metal Injection Port

Claims (4)

[Claims] 1. A release agent applying device for applying a release agent to an inner peripheral surface of a sleeve for pressurizing a molten metal by a spray nozzle, wherein a cover is arranged to cover an opening end of the sleeve. A release agent applying device, wherein the cover is connected to a dust collector. 2. The cover has a cup shape, is mounted so as to cover an open end of the sleeve, and the spray nozzle is attached to the cover so as to pass through a substantially central portion of the cover. Claim 1 characterized by the following:
The release agent applying device according to 1. 3. The release agent applying apparatus according to claim 1, wherein an air nozzle is arranged so as to be juxtaposed with said spray nozzle, and said air nozzle is attached to said cover. 4. The release agent applying apparatus according to claim 1, wherein a valve for controlling injection of the release agent by said spray nozzle is mounted outside said cover.