JPH09277021A - Method for shaking out sand mold and device thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely execute the separation of molding sand from a work and the disintegration of a sand mold so as not to send out to the following process line in the condition of sticking the molding sand on the work. SOLUTION: An air nozzle 10 is relatively inserted into a parting plane R to the sand mold M already pouring molten metal including the work W and high pressure compressed air is rapidly spouted. By this method, the high pressure compressed air is flowed at high speed along the outer periphery (moisture condensed layer) of the work W and the work W and the molding sand are separated and also, the sand mold M is made to the easily disintegrating condition and collapsed by dropping to the oscillating screen device 6.

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 demolding a sand mold in which a molten metal is poured into a sand mold and the solidified sand mold (sand mold after pouring) is collapsed to take out a casting material. .

[0002]

2. Description of the Related Art The conventional so-called demolding method for collapsing a pouring sand mold to take out a casting material is as follows: 1) Placing a pouring sand mold on the upper part of a vibrating grid body and vibration of the sand mold To collapse the sand mold by using 2) to collapse the sand mold that has been poured by using the impact of an air hammer, 3) rotate the sand mold that has been poured into a rotating drum or vibrate It is generally known that the material is thrown into a drum and collapsed by using the weight and drop of the sand mold or vibration and heat of the casting material. On the other hand, in recent years, since it has been required that the shape of a casting material be complicated, or that the dimensions be increased in density, a sand mold having high hardness and high strength is formed and casting is performed.

[0003]

The high-strength sand mold as described above has poor collapsibility and is not sufficiently separated from the casting sand. The casting material is sent to the post-process line with the casting sand adhered. However, there is a problem that the sand recovery in the casting plant that repeatedly uses the foundry sand becomes poor and the operation cannot be performed. The present invention has been made in view of the above problems, and an object of the present invention is to provide a sand mold demolding method and an apparatus therefor capable of surely separating a casting material and molding sand and collapsing a sand mold. .

[0004]

In order to achieve the above-mentioned object, the method for demolding a sand mold according to the present invention comprises a step of relatively inserting an air nozzle into a molding surface of a sand mold containing a casting material. Then, the compressed air is suddenly ejected from the inserted air nozzle, and the compressed air rapidly flows around the outer periphery of the casting material from the split surface of the sand mold to separate the casting material and the molding sand inside the sand mold. And a step of dropping the sand mold in which the casting material is separated inside the vibrating screen device to collapse the sand mold. Further, the demolding device for a sand mold according to the present invention has a trough provided with a mold carrying-in port which is closed by the above-mentioned push-up plate at the bottom of the trough, above the push-up plate for pushing up the sand mold containing the casting material. A vibrating screen device is provided at the lower end of the tip, and an extruding plate for extruding and moving the sand mold is reciprocally movable and inserted at the rear end side in the trough. A pair of two air nozzles, which are formed in the shape of a tapered blade toward the rear end side and have their air outlets facing the inside of the trough, are at the same height as the mold surface of the sand mold. It is characterized in that the sand molds are arranged so as to face each other with an interval narrower than the width dimension between the side surfaces of the sand mold.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings. In FIG. 1, an upward cylinder 1 is disposed below a position where a casting frame F containing a sand mold M that has been poured is moved by a conveyor (not shown) and stopped, and the piston rod 2 has the above-mentioned cylinder at the tip thereof. A push-up plate 3 is attached to which the sand mold M is pulled out from the flask F and pushed up. Further, a trough 4 is laterally arranged above a conveyor (not shown) for moving the casting flask F, and the sand mold M can be inserted at a position corresponding to the push-up plate 3 at the bottom of the trough 4. Mold inlet 5
Is provided. In addition, the push-up plate 3 has a sand mold M and a molding frame F.
The mold carry-in port 5
Is formed in a size that closes. The push-up plate 3 is formed in such a size that the sand mold M is pulled out from the molding frame F and further raised to close the mold carry-in port 5.

Below the tip of the trough 4, a vibrating screen device 6 for collapsing the sand mold M and taking out the casting material W is provided.
Is arranged. Further, on the rear end side of the trough 4, an extruding plate 8 attached to a piston rod 7 of a horizontal cylinder (not shown) is inserted so as to be laterally movable. Further, at the tip end side position in the trough 4, a pair of two air-heads are formed which are formed in the shape of a tapered taper toward the rear end side of the trough 4, and the air outlet 9 is directed to the inside of the trough 4. -The nozzles 10 and 10 are the molding surface R of the sand mold M.
And the side faces of the sand mold M are fixed and opposed to each other with a gap narrower than the width dimension. The air nozzles 10 and 10 are connected to a compressed air supply source (receiver tank) (not shown) through pipes 12 and 12 provided with opening / closing valves 11 and 11. In the figure, 13 is a lid member attached to the upper part of the trough 4, and 14 is a shoe for guiding the fall of the sand mold M.

Next, the operation of the device configured as described above will be described. The casting frame F containing the sand mold M that has been poured is moved by a conveyor (not shown) and pushed up.
Is stopped above and the upward cylinder 1 is activated to push up the plate 3
Is pressed against the lower part of the sand mold M, the sand mold M that has been poured is extracted from the casting frame F, and the sand mold M is carried into the trough 4 from the mold carry-in port 5 to obtain the state of FIG. Next, a horizontal cylinder (not shown) is operated and the push plate 8 is moved rightward together with the piston rod 7 to move the sand mold M to the position shown by the chain line.
At this time, the blade-shaped air nozzles 10, 10 are relatively inserted at positions on both sides of the split mold surface R of the sand mold M so as to make notches. Next, when the extruded plate 8 is returned to the original position and the push-up plate 3 is lowered, the empty flask F is moved and the next flask F containing the sand mold M that has been poured is carried in. After that, the sand mold M is inserted into the trough 4 in the same manner as described above. On the other hand, when the sand mold M is moved to the position of the air nozzles 10 and 10 as described above, the opening / closing valve 1
1, 1 are opened and compressed air supply source (receiver tank)
High-pressure compressed air from the air nozzles 10 is rapidly ejected from the tips of the air nozzles 10, 10.

Referring to FIG. 2 below, the compressed air jetted as described above forms a water condensation layer S from the molding surface R of the sand mold M by the heat of the casting material W, and the strength thereof becomes weak. The casting material W and the sand mold M are positively separated at the contact portion (water condensation layer S) by flowing at a high speed to the existing portion, that is, the outer peripheral portion of the casting material W. Such a flow of compressed air acts regardless of the shape of the casting material W, and the sand mold M
Especially when the strength is high, it effectively separates at the contact portion between the casting material W and the sand mold M. When the casting material W and the casting sand are separated in this manner, the sand mold is liable to collapse and the on-off valve 1
1, 1 and 11 are closed, the ejection of compressed air is stopped, and the state shown in FIG. 1 is obtained.

Next, the push-out plate 8 is moved rightward to move the sand mold M on the push-up plate 3 to the position shown by the chain line. By this movement, the separated sand mold M from the material at the position of the air nozzles 10, 10 and the casting material W are pushed to the right and dropped through the shoe 14 onto the vibrating screen device 6 and collapsed. Vibrating screen device 6
As a result, the sand mold M is further crushed and sifted with the casting material W and transferred to the subsequent steps.

[0010]

As is apparent from the above description, the present invention causes high-pressure compressed air to flow at high speed around the outer periphery of the casting material in the sand mold to separate the casting material from the molding sand and collapse the sand mold. Since the sand mold is made to fall onto the vibrating screen device and then collapsed after being put into a state where it is easy to do, there is an effect that the casting sand is not taken out by the casting material.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of an apparatus showing an embodiment of the present invention.

FIG. 2 is a view taken in the direction of arrows AA in FIG.

[Explanation of symbols]

 3 Push-up plate 4 Trough 5 Mold carry-in port 6 Vibrating screen device 8 Extruding plate 9 Jet outlet 10 Air nozzle F Mold flask M Sand mold R Mold split surface S Moisture condensing layer W Cast material

Claims (2)

[Claims] 1. A step of relatively inserting an air nozzle into a molding surface of a sand mold containing a casting material, and the inserted air.
A step of rapidly ejecting compressed air from the nozzle, thereby causing the compressed air to flow at a high speed around the outer periphery of the casting material from the molding surface of the sand mold to separate the casting material and the molding sand in the sand mold, and the molding material. A method of disassembling the sand mold, comprising the steps of: dropping the sand mold, which has been separated inside, onto the vibrating screen device to collapse the sand mold. 2. A trough 4 having a mold carrying-in port 5 closed at the bottom thereof is provided above a push-up plate 3 for pushing up a sand mold M containing a casting material W, and the trough 4 is provided. The vibrating screen device 6 is arranged at the tip end position of the
An extruding plate 8 for extruding and moving the sand mold M is reciprocally movable and inserted and arranged at the rear end side of the trough 4, and is tapered at the tip position in the trough 4 toward the rear end side of the trough 4. A pair of two air nozzles 10, which are formed in the shape of a knife and have the air outlet 9 directed toward the inside of the trough 4,
10 is the same height as the mold surface R of the sand mold M, and is fixedly opposed to the sand mold M with a gap narrower than the width dimension between the side surfaces of the sand mold M. apparatus