JP3308217B2 - Casting cooling and unloading method in sand circulation casting facility - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to cooling of a casting, separation of sand and casting, which have been separated by a vibrating conveyor in a sand circulation casting facility. , And the extraction method.

[0002]

2. Description of the Related Art Conventionally, in a sand circulating casting facility as described above, molds separated by a vibrating conveyor and separated into separate sand and a casting are put into a rotating drum or a vibration drum, and the casting is repeatedly separated into separate sand. The contact sand is cooled down, and the loosening sand reduces the cohesive strength by heat exchange from the casting, and is repeatedly rolled in the drum to be loosened to form sand grains and to make holes in the drum. Generally, the casting is separated into a casting and sand at a portion thereof, and the casting is cooled and taken out.

[0003]

The cooling and unloading of the casting as described above is performed by the sand metal ratio (casting / casting) of the poured mold.
When the amount of sand exceeds a predetermined value, the temperature of the sand becomes abnormally high when the sand is thrown into a rotating drum or a vibrating drum. 1) The casting is not sufficiently cooled.
℃ is required, equipment becomes complicated and the cost increases. 3) Since the sand temperature is high, the cohesive strength of the sand is weakened. There is a problem that the cast material that has been sent and left is in an idling state and a dent is formed on the cast material. The present invention has been made in view of the above-mentioned problems, and even when the sand metal ratio of a poured mold becomes a predetermined value or more, the cooling of the casting is sufficiently performed by the rotating drum or the vibration drum, and the recovered sand temperature is reduced. It is an object of the present invention to provide a method for cooling and removing a casting in a sand circulation casting facility which separates sand from a casting without requiring a special sand cooling device for lowering the casting temperature and without making a dent in the casting.

[0004]

SUMMARY OF THE INVENTION In order to achieve the above object, a method for cooling and removing a casting in a sand circulation casting facility according to the present invention is provided in which a mold is separated by a vibrating conveyor in a sand circulation casting facility. A method of cooling a casting, loosening sand, and separating the sand and the casting into pieces, and a method of cooling and removing the casting, wherein a ratio of a sand metal (casting / sand) of a poured mold before being applied to the vibrating conveyor is described. In the case of a mold in which a sand metal ratio equal to or more than a predetermined value is input to the controller by inputting mold information including the recovered sand already cooled and sifted and stored according to the sand metal ratio, It is characterized in that it is cut out, cooled and loosened of a casting, and is put into a rotating drum or a vibrating drum which separates sand and casting to take out the casting.

[0005]

Embodiments of the present invention will be described below in detail with reference to the drawings. In FIG. 1, a sand kneader 2 is disposed downstream of a sand bin 1 provided with a sand quantitative cutting machine 1A, and a mold molding machine 3 is disposed downstream of the sand kneader 2. In addition, a vibration conveyor 4 for unmolding and transferring the poured mold is disposed downstream of the mold making machine 3,
Downstream of the vibrating conveyor 4, a rotating drum or vibrating drum 5 (hereinafter, referred to as a vibrating drum 5) for cooling and loosening the casting and separating the sand and the casting is disposed. Further, a sand sifter 6 is disposed downstream of the rotating and vibrating drum 5, and the sand bin 1 is disposed downstream of the sand sifter 6, so that the sand is circulated for casting equipment.

Further, the sand bin 1 is provided with a variable sand amount cutting machine 1B for cutting the sand by changing the sand amount. The variable sand amount cutting machine 1B is connected to the rotating and vibrating drum 5 to collect the collected sand. Is supplied to the rotating and vibrating drum 5. Further, a sensor (not shown) for recognizing the poured mold is arranged outside the transfer line of the poured mold, and the sensor for confirming the type of the poured mold is provided with a sand metal ratio (cast metal) for each mold. / Sand) information is electrically connected to a controller 7 to which information is input in advance, and the controller 7 performs a comparison operation between the sand metal ratio information input in advance and the confirmed mold information. In the case of a mold having a value of 8 or more, the variable sand amount cutting machine 1B is electrically connected to the variable sand amount cutting machine 1B so as to operate the sand amount variable cutting machine 1B so as to cut the sand amount according to the value of the sand metal ratio. Have been.

[0007] The movement of the sand (mold) in the sand circulation casting facility thus configured will be described. The recovered sand cut out from the sand bin 1 through the sand quantitative cutout machine 1A is supplied to the sand kneading machine 2, converted into kneaded sand, and supplied to the mold making machine 3. Here, the kneading sand is formed into a mold and sent out, and after the upper mold and the lower mold are matched on the way, pouring is performed. The mold that has been poured in this way, that is, the poured mold, is checked by a sensor (not shown) when necessary work such as blanking is performed after the molten metal is cooled and solidified, and the sand metal ratio information is input. A signal is sent to the controller 7 which is operating. At this time, the controller 7 is controlled based on the input information.
In the above, the sand metal ratio of the poured mold is calculated, and when the value is 8 or less, the sand amount variable cutting machine 1
In the case where the signal to B is not transmitted but the value of the mold exceeds 8, a signal for controlling the cut-out amount in accordance with the sand metal ratio and operating it is transmitted to the sand amount variable cut-out machine 1B.

[0008] On the other hand, the poured mold with the frame removed and transferred as described above is put into the vibrating conveyor 4 and transferred while being separated from the mold, and the next rotation and vibration are performed in a state where the separation sand and the casting are mixed. It is thrown into the drum 5. In this case, when the sand metal ratio between the bulking sand and the casting is less than 8 as described above, the rotation and the supply of the recovered sand to the vibrating drum 5 are not performed. If it exceeds, an amount of recovered sand corresponding to the sand metal ratio is cut out from the sand bin 1 and supplied to the rotating and vibrating drum 5.

The loose sand, the casting and the recovered sand that have been put into the rotating and vibrating drum 5 in this way are moved while being rolled, and heat is generated between the loose sand (including the recovered sand) and the casting while moving. Exchange is performed to cool the casting, and the loosening sand is affected by the heat of the casting to reduce the cohesive strength so that the sand is loosened. During this time, the casting is effectively cooled by contact with sand having a sand metal ratio of about 8, and is rolled while receiving a cushion of sand to be taken out without leaving a dent. The sand thus taken out is naturally cooled while being transferred (the simple sand cooling is performed if necessary), put on a sand sifter 6 and the usable sand particles are stored in the sand bin 1. It is circulated again for sand kneading or rotation for mold making and for supplying sand to the vibrating drum 5.

[0010]

As is apparent from the above description, the present invention can be applied to a sand circulating casting machine in which a molten metal poured into a rotating or vibrating drum has a sand metal ratio exceeding a predetermined value. Since the recovered sand that has already been recovered and stored is supplied to the rotating and vibrating drums in an amount corresponding to the sand metal ratio, adverse effects that occur when the amount of sand is small (poor casting cooling, new sand cooling equipment) It is possible to eliminate all dents in the casting due to the high-speed feeding of sand due to the installation and early sand loosening action, and the effect is remarkable.

[Brief description of the drawings]

FIG. 1 is a flowchart showing the operation steps of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sand bin 1A Sand quantitative cutout machine 1B Sand variable variable cutout machine 2 Sand kneading machine 3 Mold making machine 4 Vibration conveyor 5 Rotation and vibration drum 6 Sand sieve machine 7 Controller

Continuation of the front page (56) References JP-A-8-39231 (JP, A) JP-A-1-192465 (JP, A) JP-A-53-147622 (JP, A) JP-A-6-328228 (JP) JP-A-9-164472 (JP, A) JP-A-9-225624 (JP, A) JP-A-11-347710 (JP, A) JP-A-11-342462 (JP, A) 11-333558 (JP, A) JP-A-11-57986 (JP, A) JP-A-8-281420 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B22D 29/04 B22C 5/06 B22D 30/00 B22D 29/00

Claims (2)

(57) [Claims] 1. A method for cooling and unloading a casting which has been separated into separated sand and a casting by a vibrating conveyor in a sand circulating casting facility, wherein the separated casting and casting are separated into sand and casting. In the case of a mold in which the sand metal ratio of a predetermined value or more is confirmed by inputting mold information including sand metal ratio (casting / sand) information of a poured metal mold before being applied to the vibrating conveyor to a controller, For a rotating drum or a vibrating drum, which has already been cooled and sifted and stored, the recovered sand is cut out according to the sand metal ratio, and the casting is cooled and loosened, and the casting is separated from the sand and the casting. A method for cooling and removing a casting in a sand circulation casting facility, wherein the casting is performed. 2. The method according to claim 1, wherein when the value of the sand meter ratio is 8 or more, the recovered sand is cut out in an amount corresponding to the sand metal ratio and is put into a rotary drum or a vibrating drum. 2. A method for cooling and removing a casting in the sand circulation casting facility according to 1.