JP2001025859A - Method for separating mold with molding flasks and as- cast product, and device thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely execute the separation between an as-cast product and a mold with molding flasks and the disintegration of the mold without mixing core sand in a casting into green sand when the shake-out of the mold is executed. SOLUTION: The mold with upper and lower molding flasks, in which the molten metal is already poured, is turned over. The mold with the lower molding flask is separated from the turned-over mold with upper and lower molding flasks. The mold with the upper molding flask leaving the as-cast product is air-tightly surrounded. The inner part in the structural body surrounded as air-tight is rapidly sucked to reduce the pressure and make the negative pressure, and also, the mold with the upper molding flask is disintegrated by holding the negative pressure state for a fixed time and separated from the as-cast product. After releasing the air-tightly surrounded state, the as-cast product is taken off.

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 suitable for separating a casting material from a poured mold with a flask.

[0002]

2. Description of the Related Art In general, when a casting is manufactured using a green mold and a core, the recovered sand collected after separating the mold is subjected to a required treatment, regenerated as casting sand, and used for mold molding. It has become.

[0003] On the other hand, conventionally, the following method is known as a method for separating a casting mold and a casting material by disintegrating a poured casting mold. When pulling out the mold from the flask, dropping the mold by gravity, or using a vibrator to break and separate the mold due to the weight and vibration of the mold. The mold is collapsed by using an impact such as applying a mechanical external force, such as inserting a protrusion into the mold, separating the mold, pulling out the mold from the flask, and then placing the mold on a rotating drum or vibrating drum. Put in and break down using the weight and drop or vibration of the mold and the heat of the casting material,
Things to separate, etc.

[0004]

By the way, the recovered sand contains a large amount of core pieces generated by the collapse of the core in addition to the green pieces generated by the collapse of the green mold. In addition, among the recovered sand, the sand produced by the collapse of the raw mold contains a large amount of clay necessary for foundry sand, but the sand produced by the collapse of the core contains this clay. Not. Therefore, when reclaiming and manufacturing sand for green molding from recovered sand, it is desirable that this recovered sand does not contain core sand.However, when the mold is separated, the core sand in the casting becomes green sand. There was a problem of mixing in.

[0005] Further, in the above-mentioned conventional methods of separating a casting material from a mold with a casting flask, separation is performed by applying a large impact to the casting mold or the casting material, and contact with other casting materials is also prevented. This causes defects such as cracking, chipping, dents, deformation and the like in the casting material. Further, in recent years, since a casting having a high hardness and a high strength is molded and cast due to a demand for complicated shape of the casting material and high precision of dimensions, etc., the mold and the casting material are separated with a larger force. The need is emerging.

In addition, since the high-strength mold as described above has a poor disintegration property, the casting material is not sufficiently separated from the green sand, and is sent to the subsequent process with the green sand adhered. For this reason, sand recovery in a mold casting plant with a flask that uses fresh sand repeatedly becomes worse. In addition, the cost of raw sand increases and core sand is mixed into the recovered sand, so that the sand treatment process is difficult. Further, since a plurality of casting materials flow simultaneously to the post-processing step, the history of each casting material becomes unclear. For this reason, when a defect occurs in the casting material, it is difficult to specify various conditions, and it is difficult to take sufficient measures.

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to prevent the core sand in the casting from being mixed into the green sand when the mold is separated, and to further reduce the casting cost. It is an object of the present invention to provide a method and a device capable of reliably separating a material from a mold with a flask and collapsing the mold.

[0008]

According to a first aspect of the present invention, there is provided a method for separating a casting mold with a flask and a casting material from a poured casting mold. A step of reversing the poured mold with upper and lower flasks, a step of separating the mold with lower flask from the inverted molds with lower and upper flasks, And the inside of the hermetically surrounding structure is rapidly suctioned and reduced in pressure to a negative pressure state, and the negative pressure state is maintained for a certain period of time to collapse the mold with the upper flask and to cast a casting. It is characterized by comprising a step of separating from the raw material, and a step of taking out the casting raw material after releasing the hermetically enclosed state.

[0009]

In the method for separating a mold with a flask and a casting material according to the first aspect of the present invention, the degree of negative pressure inside the airtightly surrounding structure is determined based on the entire raw sand containing moisture in the moisture condensing layer. The boiling point of the water is lowered to bring the water to a boil, so that the green mold is collapsed and has a height that can be separated from the casting material.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to FIGS. As shown in FIG. 1, an apparatus for separating a casting material from a poured mold with upper and lower flasks is a reversing means 3 for reversing the poured molds 1 and 2 with upper and lower flasks.
And lower mold separating means 4 for separating the lower casting mold 2 from the inverted lower / upper casting mold 2.1, and airtight surrounding means for hermetically surrounding the upper casting mold 1 with the remaining casting material. 5
And suction means 6 for reducing the pressure inside the space defined by the airtight surrounding means 5 to reduce the pressure to a negative pressure state and maintaining the negative pressure state for a certain period of time. And a casting material removing means 7 for removing the casting material from the mold 1.

The reversing means 5 includes a lower roller conveyor 8 on which the molds 1 and 2 with upper and lower molding flasks can be placed and conveyed in the left-right direction. Separable mold 1 with upper and lower flasks
An upper roller conveyor 9 capable of clamping 2 with the lower roller conveyor 8; and an upper and lower roller conveyor 8
A pair of annular members 10 and 10 on which the upper and lower roller conveyors and a pair of annular members 10 and 10 are rotatably supported. I have.

The lower mold separating means 4 is composed of a traveling vehicle 12 which can reciprocate in the front-rear direction, and a lifting mechanism 13 mounted on the traveling vehicle 12 to lift the lower mold 2 with the lower casting frame.

As shown in FIG. 1, the airtight surrounding means 5 comprises a box-shaped tray 15 which can be moved up and down by an upward cylinder 14, and a reversely fixedly disposed right above the tray 15. The tray 15 is provided with a mold placing member 30 having a structure in which a plurality of strips are arranged at a required interval in the left-right direction at the bottom of the tray 15. The tray 15 can be tilted counterclockwise to an angle at which a mold or the like slides down. At the lower end of the cover 16, a seal member 17 is embedded. Further, the suction means 6 is connected to the cover 16 in communication, and the suction means 6 includes an on-off valve 18, a conduit 19, and a vacuum source 20.

The casting material take-out means 7 includes a fork member 21 configured to be movable left and right, vertically movable, and horizontally rotatable, and a drive mechanism 22 for moving the fork member 21 horizontally, vertically and horizontally. It is composed.

Reference numeral 23 in the drawing denotes a transfer device for transferring the molds 1 and 2 with upper and lower flasks in the horizontal direction. The transfer device 24 is capable of reciprocating in the left-right direction. And a lifting mechanism 25 for lifting the molds 1 and 2 with upper and lower flasks. Reference numeral 26 denotes a platen carriage on the cooling line, 27 denotes a first roller conveyor connecting the cooling line and the reversing means 3, 28 denotes a second roller conveyor connecting the reversing means 3 and the airtight surrounding means 5, and 29 denotes a collecting chute. It is.

Next, a procedure for separating the casting material W from the poured molds 1 and 2 with the upper and lower flasks by using the above-described structure will be described. As shown in FIG. 1, firstly, poured molds 1 and 2 with upper and lower casting frames placed on a surface plate carrier 26 and flowing on a cooling line of a casting line.
Are lifted by the lifting mechanism 25 of the transport device 23 and transferred onto the first roller conveyor 27. Subsequently, the lower mold 1 and the lower mold 2 with the upper and lower flasks are transferred via the first roller conveyor 27 to the lower roller 3. It is carried on the conveyor 1.

Next, the upper and lower roller conveyors 8 and 9 of the reversing means 3 are brought closer to each other, and the molds 1 and
Then, the rotating roller mechanism 11 of the reversing means 3 is driven for a required time to rotate the molds 1 and 2 with upper and lower flasks 180 degrees through the annular members 10 and 10 to invert them. The arrangement of the molds 1 and 2 with upper and lower flasks is reversed. Next, the lower and upper roller conveyors 9.8 are separated from each other to unclamp the upper and lower flasks with the molds 1.2,
The inverted molds 2.1 with lower and upper flasks are sent out from the reversing means 3 onto the second roller conveyor 28.

Next, the lower casting mold 2 is lifted from the lower casting mold 2.1 by the lifting mechanism 13 of the lower casting mold separating means 4, and then the traveling carriage 12 of the lower casting mold separating means 4 and the like. , Lower mold 2 with upper mold 1
Transfer from directly above. Next, the second roller conveyor 2
8, the casting mold W with the upper casting flask remaining in the casting material W is transferred to the hermetic surrounding means 5, and then the cylinder 14 of the hermetic surrounding means 5 is extended to operate the mold placing member on which the casting mold with the upper casting frame 1 is placed. The seal member 17 is brought into contact with the tray 15 by raising 30 and the like, and the mold 1 with the upper casting frame remaining with the casting material W is hermetically surrounded by the tray 15 and the cover 16 as shown in FIG.

By the way, generally, as shown in FIG. 3, a casting material W
A heat-condensed layer (moisture condensation layer) is formed at a higher temperature than other parts of the upper mold 1 with a heat, and the moisture condensation layer has low strength. Because of this,
The on-off valve 18 of the suction means 6 is opened, and the tray 15 and the cover 1
When the space is negatively depressurized by abruptly suctioning and depressurizing the air-tight space defined by step 6 and maintaining this negative pressure for a certain period of time, the boiling point of the water in the entire mold including the water in the water condensation layer As a result, the water boils, and as a result, the mold 1 with the upper flask collapses and is separated from the casting material W.

The broken mold pieces are deposited on the tray 15. Since the core does not collapse due to boiling of water, the core remains in the casting material W and does not mix into the mold pieces. Next, after the on-off valve 18 is closed, an atmospheric pressure return valve (not shown) attached to the cover 16 is opened to return the inside of the cover 16 and the like to atmospheric pressure.
To lower the tray 15, the upper flask, the mold 1, the casting material W, and the like. Next, the drive mechanism 22 of the casting material take-out means 7 is driven to move the fork member 21 to the left, so that the fork member 21 enters below the casting material W,
Subsequently, the drive mechanism 22 is driven to raise the fork member 21 and lift the casting material W from the mold placing member 30.

Next, the drive mechanism 22 is driven to move the casting material W to the left by the fork member 21.
The casting material W is transported to a post-processing step. And Tray 1
5 and the mold placing member 30 are tilted, and the mold pieces deposited on the tray 15 and the mold placing member 30 are discharged onto the collection chute 29 and conveyed to the sand processing line.

[0022]

As is apparent from the above description, claim 1
The invention comprises a step of inverting a poured mold with upper and lower flasks, a step of separating the mold with lower flask from the inverted mold with lower and upper flasks, and a step of separating upper mold with residual casting material Step of hermetically enclosing the mold with the mold, rapidly aspirating the interior of the hermetically enclosing structure to a negative pressure state and maintaining the negative pressure state for a certain period of time to collapse the mold with the upper flask. The step of separating the casting material from the casting material, and the step of removing the casting material after releasing the airtightly enclosed state, so that when the mold is separated, the core sand in the casting is mixed into the raw sand. In addition, excellent effects such as separation of the casting material and the mold with a casting frame and collapse of the mold can be reliably and easily achieved.

[Brief description of the drawings]

FIG. 1 is a front view showing one embodiment of the present invention.

FIG. 2 is an operation explanatory diagram in FIG. 1;

FIG. 3 is an operation explanatory view of a main part in FIG. 2;

[Explanation of symbols]

 Inversion means Lower mold separation means Airtight surrounding means Suction means Casting material removal means

Continued on the front page (72) Inventor Shigeaki Yamamoto 3-1 Honohara, Toyokawa City, Aichi Prefecture Shinto Kogyo Co., Ltd. (72) Inventor Koichi Kanto 3-1 Honohara Toyokawa City, Aichi Prefecture Shintokogyo Co., Ltd. (72) Inventor Hiroaki Tokita 3-1 Honohara, Toyokawa City, Aichi Prefecture Shinto Kogyo Co., Ltd. Toyokawa Plant (72) Inventor Yasushi Ohno 3-1 Honohara Toyokawa City, Aichi Prefecture Toyokawa Plant Co., Ltd. (72) Inventor Kazuo Sugimoto 3-1 Honohara, Toyokawa, Aichi Prefecture Shintokogyo Co., Ltd.

Claims (2)

[Claims] 1. A method for separating a casting material from a poured casting mold with a casting flask, comprising the steps of: inverting a poured casting upper / lower casting flask; A step of separating the lower mold from the mold from the mold, a step of hermetically surrounding the upper mold with the remaining casting material, and abruptly suctioning and depressurizing the inside of the hermetically surrounding structure to a negative pressure state. A step of separating the casting mold material by collapsing the mold with the upper flask while maintaining a negative pressure state for a certain period of time, and removing the casting material after releasing the hermetically enclosed state,
A method for separating a mold with a flask and a casting material, comprising: 2. An apparatus for separating a casting material from a poured mold with a casting flask, comprising a reversing means for reversing a poured casting mold with an upper and lower casting flask, and a reversed lower and upper casting flask. A lower mold separating means for separating the lower mold with the mold from the mold with the mold, an airtight surrounding means for sealingly surrounding the upper mold with the casting material remaining, and a suction decompression inside the space defined by the airtight surrounding means. Suction means for maintaining the negative pressure state for a certain period of time while maintaining a negative pressure state, and casting material taking out means for taking out the casting material from the mold with the upper flask that has been released and collapsed when the negative pressure state is released. Characteristic separation device for casting mold and casting material.