JPH1110303A - Method and device for atomizing liquid-state agent onto contacting surface of molten metal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To uniformly atomize the releasing agent in the quantity to be atomized and to eliminate the unevenness of spraying by blowing the air for atomizing the releasing agent supplied into an air supplying chamber for spraying through an air piping from an air source. SOLUTION: The air for atomizing the releasing agent is introduced into the air supplying chamber 43 for spraying through the air piping 44 by exciting an electromagnetic valve 47. The releasing agent is supplied into a releasing supplying chamber 36a through an atomizing liquid piping 46 by exciting an electromagnetic valve 48. The releasing agent is atomized onto a cavity surface in a die by descending a spray head 30. Since an annular area between the inner diameter of a pipe 42 for spraying air and the outer diameter of a pipe 41 for spraying liquid, is made to small, the blowing speed of the air becomes large and the releasing agent is finely atomized. At the time of exciting the electromagnetic valve 49, the air is introduced into a barrier membrane pressing air supplying chamber 36a and the barrier membrane 38 is made into the covering state in the upper edge part of the recessed part 32, and it can be prevented that the remained releasing agent is leaked in a dripping state from the tip part of the pipe 4 for spraying liquid.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for spraying a liquid agent onto a contact surface of a molten metal for preventing cracks in the inner surface of a mold cavity for various castings.

[0002]

2. Description of the Related Art Generally, in a molding machine, for example, a die casting machine, every time the mold is opened before clamping and pouring, the cast product is released from the mold and the mold cavity is removed. Spraying a release agent to cool the surface has been performed.

FIG. 7 shows a demagnetized state of a solenoid valve for stopping the supply of the release agent and the air from the release agent supply source and the spray air source of the release agent, and FIG. 8 shows the supply of the release agent and the air. This shows the excitation state of the solenoid valve to be performed. A conventional example will be described with reference to FIGS. 7 and 8.
Is a device in which a long spray pipe 52 is erected below. The spray head 50 includes a manifold 56 for distributing the release agent atomized by the atomizer 54, and an air pipe 58 for supplying air from the air source for releasing the release agent to the atomizer 54.

On the other hand, an air pipe 59 is provided so as to be branched from the air pipe 58, and the air pipe 59 is connected to the head side of a movable valve 62 constituting the atomizer 54. Further, a spray liquid pipe 60 for supplying a release agent from a spray liquid supply source is provided. Code 64, 66, 6
Numeral 8 denotes an electromagnetic valve, which excites the solenoid valves 64, 66 and 68 from the demagnetized state of the solenoid valve as shown in FIG. Overcome and push down, movable valve 6 in the figure
2 is moved to the right, and the release agent introduced from the spray supply source through the pipe 68 is atomized to an appropriate droplet diameter by the atomizer 54 by the spray air introduced from the pipe 58. .

[0005]

However, in the prior art described above, even if the release agent can be atomized to a desired droplet diameter by the atomizer 54, the release agent is arranged in parallel to the manifold 56 from the atomizer 54. With respect to many spray pipes 52, there is a problem in that the spray amount from the near spray pipe 52 and the spray amount from the far spray pipe 52 is different, and the application of the mold is unevenly sprayed.

Since the release agent is atomized inside the manifold 56, even if the release agent can be finely and uniformly atomized, the release agent is atomized while flowing along the inner wall surface of the manifold 56. Since the agents are united to form a massive droplet diameter and applied to the mold through the spray pipe 52 far away from the atomizer 54, there is a problem that uneven spraying occurs.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to make the spray amount of the release agent from the spray liquid pipe uniform and to make the spray of the release agent uniform. The unevenness of spraying is eliminated by shaping.

[0008]

According to a first aspect of the present invention, there is provided a release agent supplied to a release agent supply chamber from a spray liquid supply source via a spray liquid pipe. When ejecting from the spray liquid pipe, the release agent spray air supplied from the air source to the spray air supply chamber via the air pipe is atomized by the air ejected from the spray air pipe, In the second invention, when the release of the release agent onto the mold cavity surface is completed, the pressurized air is introduced from the air source into the diaphragm pressurized air supply chamber via the air pipe, and the pressurized air is actuated. The diaphragm was pushed down, and the supply path leading from the release agent supply chamber to the spray liquid pipe was closed. Further, in the third invention, a base in which a plurality of concave portions are arranged in parallel in a spray head for atomizing a release agent, and a lid is attached to the base, and the base is surrounded by the base and the lid. A distribution chamber, a diaphragm sandwiched between the base and the lid to divide the distribution chamber into upper and lower parts, a spring mounted between the recess and the diaphragm, and a lowermost part of the base and separated from the distribution chamber. The spray air supply chamber, the spray liquid pipe hanging down from the recess, and the spray air pipe hanging down from the spray air supply chamber and arranged concentrically with a larger diameter than the spray liquid pipe. In the fourth invention, the diaphragm is made of a flexible material.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method and an apparatus for spraying a liquid agent onto a contact surface of a molten metal according to the present invention will be described below in detail with reference to FIGS.

FIG. 1 is an explanatory view showing a state in which the supply of the release agent and the air from the spray air source is stopped by demagnetizing the solenoid valve, and FIG. 2 is a view showing the release agent by excitation of the solenoid valve. FIG. 3 is an explanatory view when the supply of the release agent is stopped by applying air pressure to the diaphragm, FIG. 4 is an enlarged sectional view of a main part of FIG. 3, and FIG. FIG. 6 is a plan view of the die casting machine.

First, the structure of the die casting machine will be described with reference to FIGS. A machine base 1 formed of a steel plate, a shaped steel, or the like is provided on a floor. On one end of the machine base 1, a stationary platen 3 formed in a substantially square shape is mounted, and in the center thereof, a tapered hole (for inserting a nozzle of a molding material injection device 20) is inserted. (Not shown) is formed.

An end platen 4 is fixed to the other end of the machine base 2 so as to be movable and adjustable. The fixed platen 3 and the end platen 4 connect four corners of four tie rods. After the movement is adjusted, it is fixed by the nut 6. Reference numeral 7 denotes a movable platen formed by fitting holes at four corners of the tie bar 5 so as to be capable of moving forward and backward with respect to the fixed platen 3. The piston rod is moved back and forth with respect to the fixed platen 3 by moving the piston rod back and forth by hydraulic pressure.

A fixed mold 11 and a movable mold 12 having mold cavities 11a and 12a are mounted on the fixed platen 3 and the movable platen 7, respectively. The mold is clamped by moving forward from the mold open state.
Reference numeral 14 denotes a tie bar removing device, 16 denotes a safety door, 18 denotes a nut dividing device, 20 denotes an injection device, and 22 denotes a release agent spraying device provided with a spray head 30 that can move vertically and horizontally.

In the present embodiment, the release agent spraying device 22 mounted on the upper part of the die casting machine 29 will be described in detail. The release agent spraying device 22 includes a spray head 30, a spray liquid pipe 41, a spray air pipe 42, a spray air supply chamber 43, air pipes 44 and 45, a spray liquid pipe 46, and solenoid valves 47, 48 and 49. It is configured.

The spray head 30 includes a base 31 in which a plurality of recesses 32 are engraved at regular intervals and arranged in parallel.
1 is provided with a distribution chamber 36 which is attached to the lid 34 and is bent by the base 31 and the lid 34. Further, in the distribution chamber 36, a diaphragm 38 sandwiched between the base 31 and the lid 34 is disposed, and the release agent supply chamber 36 a located at the lower part and the diaphragm located at the upper part are distributed by the diaphragm 38. It is divided into a pressurized air supply chamber 36b.

A spring 39 is elastically mounted between the concave portion 32 and the diaphragm 38, and the diaphragm pressing air supply chamber 3 is provided.
When the pressurized air of the diaphragm 38 introduced from the air source acts on 6b, the diaphragm 38 is pressed, and the diaphragm 38 simultaneously and uniformly hits the circular edge portion 40 located above the concave portion 32. In contact therewith, the supply of the release agent from the spray supply source can be completely stopped. The diaphragm 38
Is preferably a flexible material such as rubber.

On the other hand, air is introduced into the lowermost portion of the base 31 which is separated from the release agent supply chamber 36a to spray the release agent supplied to the release agent supply chamber 36a to an appropriate droplet diameter. A spray air supply chamber 43 is provided. Spray air pipes 42 hanging down from the spray air supply chamber 43 and arranged in parallel at a predetermined interval are attached.

The spray air pipe 42 has a diameter slightly larger than a predetermined length of the spray liquid pipe 41 attached to the lowermost part of the concave portion 32 provided in the release agent supply chamber 36a of the spray head 30. The spray air pipe 41 is disposed concentrically with the spray liquid pipe 41, and the spray air pipe is so formed that the release agent is sufficiently atomized by the air introduced into the spray air supply chamber 43. It is attached to be slightly longer than 41.

Further, the nozzle 41A composed of a combination of the spray liquid pipe 41 and the spray air pipe 42 is made of a flexible material using a copper pipe or a flexible pipe. When the spray head 30 is lowered during the state, the release agent sprayed from the tip injection port of the nozzle 41A can be uniformly sprayed onto the surface of the desired mold cavity 11a, 12a. It is bent to face.

An air pipe 44 for supplying air from an air source for spraying a release agent to an air supply chamber 43 for spraying is provided. On the other hand, an air pipe 45 is provided so as to branch off from the air pipe 44, and the tip is connected to the diaphragm pressing air supply chamber 36b. The air pipe 4
The air introduced into the pressurized air supply chamber 36b through 5 causes a uniform downward pressing force to act on the diaphragm 38.

A spray liquid pipe 46 for supplying a release agent from a spray liquid supply source is provided, and its tip is connected to a release agent supply chamber 36a. Reference numerals 47, 48, and 49 denote solenoid valves. When the solenoid valve 47 is demagnetized, the spray air supply chamber 43 passes through an air pipe 44 from an air source.
When air supply is stopped and the electromagnetic valve 47 is excited, air can be introduced.

Similarly, when the solenoid valve 49 is demagnetized,
Air is no longer introduced into the diaphragm pressing air supply chamber 36b through the air piping 45 branched from the air piping 44, so that the diaphragm 38 cannot be pressed downward. It is configured to be separated from the edge portion 40. Further, conversely, when the electromagnetic valve 49 is excited, the air source and the diaphragm pressing air supply chamber 36b are connected to each other so that air can be introduced into the diaphragm pressing air supply chamber 36b.

Further, an electromagnetic valve 48 is attached in the middle of the spray liquid pipe 46, and by releasing the electromagnetic valve 48 from 0N (excitation) to 0FF (demagnetization), a release agent is supplied from the spray liquid supply source. It is configured to be able to supply or stop the release agent supply chamber 36a.

Next, a method of spraying the liquid agent onto the contact surface of the molten metal of the liquid agent spraying apparatus thus configured will be described.

First, left and right fixed molds 11 and movable molds 12
With the mold opened, the arm 26 is lowered to insert the spray head 30 between the molds 11 and 12, and the nozzle 4
The release agent from 1A to about 20 ° C. is atomized and sprayed uniformly on the surfaces of the mold cavities 11a and 12a.

Specifically, the operation is performed as follows. That is, the tip of the nozzle 41A is connected to both the mold cavities 11.
a, 12a. FIG. 1 shows the solenoid valves 47 and 4
8 and 49 show the case where the demagnetized state is indicated and the spray head 30 is not supplied with the release agent or the air for spraying the release agent.
From such a state, first, as shown in FIG.
Is excited, the release agent spray air from the air source is introduced into the spray air supply chamber 43 through the air pipe 44. Subsequently, when the solenoid valve 48 is excited, the release agent from the spray liquid supply source passes through the spray liquid pipe 46 and the release agent supply chamber 36.
a. In this case, the solenoid valve 49 is in a demagnetized state.

With the electromagnetic valves 47 and 48 kept in the excited state as shown in FIG. 2, the spray head 30 is gradually lowered to spray the release agent uniformly over the entire surfaces of the mold cavities 11a and 12a. It is. In this case, the release agent is supplied to the release agent supply chamber 36a, but by reducing the so-called annular area between the inner diameter of the spray air pipe 42 and the outer diameter of the spray liquid pipe 41, the release area is reduced. Is increased, and the release agent supplied to the end of the release agent supply chamber 36a is atomized to a small droplet diameter when ejected from each spray liquid pipe 41. It is.

After the release agent is completely sprayed on the entire surfaces of the mold cavities 11a and 12a, as shown in FIG. 3, the solenoid valve 47 and the solenoid valve 48 are demagnetized and the solenoid valve 49 is excited at the same time. Air from the air source is introduced into the diaphragm pressing air supply chamber 36b through the air pipe 45. When the pressure of the pressurized air uniformly acts on the upper surface of the diaphragm 38, the diaphragm 38 overcomes the spring 39 and is pushed downward. As shown in FIG. Abut.

For this reason, the edge portion 40 is made of the flexible diaphragm 3.
The release agent remaining in the release agent supply chamber 38a after the spraying is completed is removed by the spray liquid pipe 4
It is possible to prevent the leakage from the tip of the first part by the diaphragm 38. Thereafter, the arm 26 is raised to retract the spray head 30 from between the molds 11 and 12,
The fixed mold 11 and the movable mold 12 are closed and clamped.

[0030]

As is apparent from the above description, in the present invention, the pressurizing air acts on the diaphragm to depress the diaphragm and supply the release agent to the plurality of spray liquid pipes. At the same time, after the spraying of the release agent onto the surface of the mold cavity is completed, the leakage of the button can be completely prevented, so that the stain of the die casting machine due to the adhesion of the release agent can be prevented. In addition, by reducing the gap between the spray liquid pipe and the spray air pipe, the mass velocity of the release agent spraying air ejected from the gap increases, and the release agent is atomized into a small droplet diameter. it can.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a state in which supply of a release agent and air from a spray air source is stopped by demagnetization of a solenoid valve according to the present invention.

FIG. 2 is an explanatory view showing a spray state of a release agent by excitation of an electromagnetic valve.

FIG. 3 is an explanatory view when the supply of a release agent is stopped by applying air pressure to a diaphragm.

FIG. 4 is an enlarged sectional view of a main part of FIG.

FIG. 5 is a front view of the die casting machine.

FIG. 6 is a plan view of the die casting machine.

FIG. 7 is an explanatory view showing a spray state of a conventional release agent.

FIG. 8 is an explanatory view showing a spray state of a conventional release agent.

[Explanation of symbols]

 2 Machine Base 3 Fixed Platen 4 End Platen 5 Tie Bar 7 Movable Platen 8 Clamping Cylinder 10 Toggle Mechanism 11 Fixed Die 11a Cavity of Fixed Die 12 Movable Die 12a Cavity of Movable Die 14 Tie Bar Removal Device 16 Safety Door 18 Nut Splitting device 20 Injection device 22 Release agent spraying device 26 Arm 29 Die-casting machine 30 Spray head 31 Base 32 Recess 34 Lid 36 Distribution room 36a Release agent supply chamber 36b Diaphragm pressing air supply chamber 38 Separator 39 Spring 40 Edge 41 spray Liquid pipe 41A Nozzle 42 Spray air pipe 43 Spray air supply chamber 44, 45 Air piping 47, 48, 49 Solenoid valve 50 Spray head 52 Spray pipe 54 Atomizer 56 Manifold 58, 59 Air piping 60 Spray liquid piping 62 Movable valve 64, 66, 68 Solenoid valve

Claims (4)

[Claims] When a release agent supplied from a spray liquid supply source to a release agent supply chamber via a spray liquid pipe is ejected from a spray liquid pipe, a spray air is supplied from an air source through an air pipe. A method for spraying a liquid agent onto a contact surface of a molten metal, wherein air for releasing a release agent supplied to a supply chamber is atomized by air ejected from a pipe for spray air. 2. When the release agent is sprayed on the surface of the mold cavity, pressurized air is introduced from an air source into the diaphragm pressurized air supply chamber via an air pipe, and the pressurized air is actuated to act as a diaphragm. Characterized in that the supply passage leading from the release agent supply chamber to the spray liquid pipe is closed. 3. A base in which a plurality of recesses are arranged in parallel on a spray head for atomizing a release agent, and a distribution chamber surrounded by the base and the lid by attaching a lid to the base. A diaphragm sandwiched between the base and the lid to divide the distribution chamber up and down, a spring mounted between the recess and the diaphragm, and a lowermost part of the base and separated from the distribution chamber. A spray air supply chamber, a spray liquid pipe hanging down from the recess, and a spray air pipe hanging down from the spray air supply chamber and arranged concentrically with a larger diameter than the spray liquid pipe. A liquid agent spraying device characterized by the above-mentioned. 4. A liquid agent spraying device using a flexible material for the diaphragm according to claim 3.