JPH0123224B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus suitable for molding a frame-shaped main mold using gas-curable kneaded sand.

For example, in a gas-curing molding method such as the cold box method, in which a mold is created by blowing the hardening gas of the binder into the kneaded sand containing a gas-hardening binder and making it flow through, the main focus is on molding the core. However, in recent years, attempts have been made to mold main molds or frame-shaped main molds. but,
A molding device suitable for molding this frame-shaped main mold had not yet been perfected.

The present invention has been made in view of the above circumstances, and one embodiment of the present invention will be described in detail below with reference to the drawings.

Reference numeral 1 denotes a base, and on the base 1 a model plate 3 with a hollow chamber 2 at a lower position is installed via leg members 4, 4, and a vent plug (not shown) is provided on the upper surface of the model plate 3. Fitted small holes 5, 5 are bored to reach the hollow chamber 2, and the hollow chamber 2 is provided with an intake hole 6 that is communicatively connected to a vacuum suction device (not shown).
In addition, between the base 1 and the model plate 3, there is a casting flask 1, which will be described later.
An elevating frame 8, which has push-up rods 7, 7 for pushing up 0 and 7 erected on both left and right sides, is arranged so as to be movable up and down via an upward cylinder 9 installed on a base 1.

Reference numeral 10 denotes a casting flask equipped with a lower flange that extends directly above the push-up rods 7, 7 when placed on the model plate 3, and on both left and right sides of the upper surface of the casting flask 10, flanges are oriented in the left-right direction. Suspension member 10 having through hole 11
a, 10a are bored, and horizontal cylinders 12, 12 are mounted on the outer surfaces of the left and right side walls of the flask 10 with piston rods 12a, 12a slidably penetrating the side walls of the flask 10. In addition, cylinder 1
The tip of the piston rod 2 protrudes from the inner surface of the flask 10 when the cylinder 12 is extended, and retracts into the side wall of the flask 10 when the cylinder 12 is shortened. 13 is a cover member for closing the upper end opening of the flask 10;
Reference numeral 3 is fixed to the lower end of a piston rod of a cylinder 14 which is fixedly inserted downward into a traveling carriage 20, which will be described later.
Openings 15, 15 are formed to pass through the flanges 10a, 10a, and the piston rods 16a, 16a are formed on both left and right sides of the upper surface of the flange 13a.
Horizontal cylinders 16, 16 that can be fitted into the through holes 11, 11 of a are attached. Further, a downward cylinder 17 is attached to the center of the upper surface of the cover member 13, and a mold extrusion plate 18 is located within the cover member 13 and fixed to the lower end of the piston rod of the cylinder 17 that penetrates the ceiling wall of the cover member 13. ing. Furthermore, a hardening gas supply port 19 is provided on the side wall of the cover member 13 and is connected to a hardening gas generator (not shown) via a flexible pipe. Reference numeral 20 denotes a transport carriage that transports the cylinder 14 suspending the cover member 13 etc. from a position directly above the horizontal mold plate 3 to a position immediately above the appropriate mold holder 21. It is movably mounted on the flanged rollers 24, 24 of the flanged roller conveyor 23 installed on the foundation.
Note that 25 to 27 are guide rods provided on the elevating frame 8, the extrusion plate 18, the cover member 13, etc., and 28 is a cushion member attached to the upper surface of the mold holder 21.

In this structure, the space defined by the model plate 3 and the flask 10 is filled with kneading sand S containing a gas-hardening binder, and the cylinder 12,
12 is extended and the piston rods 12a, 12
a into the kneaded sand S, and the cylinder 14 is extended to lower the cover member 13 and cover the flask 10, and the suspension members 10a, 10a are inserted into the opening 15 of the flange 13a.
The piston rods 16a, 16a are inserted into the through holes 11, 11 of the suspension members 10a, 10a by the extension of the cylinders 16, 16, thereby connecting the cover member 13 and the flask 10. Then,
The intake hole 6 is operated by a vacuum suction device (not shown).
When the hardening gas is sucked into the cover member 13 from the supply port 19 by suctioning the inside of the flask 10 through the hollow chamber 2, the small holes 5, etc., the hardening gas flows into the kneaded sand S, the small holes 5, 5, etc. The mixed sand S is sequentially passed through, enters the hollow chamber 2, and is sucked and discharged from the intake hole 6, and as a result, the kneaded sand S is hardened. After the required time for the kneaded sand S to harden has elapsed, the operation of the vacuum suction device is stopped, and the cylinder 1
The compressed air for operation of 4 is discharged and the cylinder 14 is
After making it free, the cylinder 9 is extended to raise the push-up rods 7, 7, etc., and the flask 10 containing the hardened kneaded sand 8 and the cover member 13 are removed.
etc. to cut out the mold. At this time, since the piston rods 12a, 12a of the cylinders 12, 12 are contained in the hardened kneading sand S, the kneading sand S does not fall out of the flask 10. Next, by shortening the cylinder 14, the cover member 13 etc. are raised, and at the same time the flask 10 containing the mixed sand S is lifted.
The carriage 20 is moved to the right by a drive means (not shown) to transport the flask 10 and the like to a position directly above the mold holder 21, and the cylinder 1 is lifted up again.
4, the flask 10 is lowered to near the mold holder 21, and the cylinders 12, 12 are shortened to lower the piston rod 12.
a, 12a are extracted from the kneaded sand S, and the cylinder 1 is
7, the extrusion plate 18 is lowered to press the upper surface of the kneaded sand S, and at the same time, the cylinder 14
The flask 10 etc. is raised by the shortening operation of the flask 1.
Kneaded sand S and cushion member 2 extruded from 0
When this operation is continued for a predetermined period of time while maintaining a short distance from the mold 8, the kneaded sand S is pushed out of the flask 10 and falls onto the cushion member 28, thereby obtaining a desired mold. After extracting the mixed sand S and raising the empty flask 10, cover member 13, etc., the traveling cart 20, etc. is moved to the left to transport the empty flask 10, etc. to a position directly above the model plate 3. , the flask 10 and the like are lowered by the extension operation of the cylinder 14 and placed on the model plate 3, and the piston rods 16a, 16a are pulled out from the through holes 11, 11 by the contraction operation of the cylinders 16, 16, and the cover member 13 is removed. and the flask 10, the cover member 13 is raised and separated from the flask 10 by the shortening operation of the cylinder 14, and a predetermined space is defined between the model plate 3 and the flask 10, and the entire process is completed. finish.

In the above embodiment, the model plate 3 is fixedly provided and the flask 10 and cover member 13 are configured to move left and right, but the flask 10 and cover member 13 are only able to move up and down. The model board 3 may be horizontally reciprocated. Further, the mold holder 21 may be an appropriate mold conveying device such as a pallet conveyor. Furthermore, the cylinders 12, 12 may be omitted if the hardened kneaded sand S does not fall out of the flask 10 during mold removal. Further, the mold cutting may be performed by lifting the flask 10 via the cover member 13, and the push-up rods 7, 7, cylinder 9, etc. may be omitted.

Since the present invention is constructed as described above, the kneaded sand in the flask is hardened by the flow of hardening gas caused by the suction action, so the force required to clamp the cover member, flask, model plate, etc. is small. , therefore,
Compared to a conventional device that blows pressurized hardening gas, the device of the present invention has less strength, is small-scale, and is inexpensive, and there is no leakage of hardening gas. Moreover, it has excellent effects such as being able to easily form a frame-shaped main mold and molding continuously and mechanically.

[Brief explanation of drawings]

The drawing is a partially cutaway front view showing an embodiment of the present invention. 2: hollow chamber, 3: model plate, 5: small hole, 10: casting flask, 13: cover member, 18: extrusion plate, 21:
Mold holder.

Claims (1)

[Claims] 1. A model plate 3 having a hollow chamber 2 communicating with a suction device at a lower position and having a plurality of small holes 5, 5 formed on its surface leading to the hollow chamber 2, and a mold holder 21.
Alternatively, a mold conveying device may be arranged in parallel at an appropriate interval, and the flask cover member 13 connected to the hardening gas generator may be placed directly above the model plate 3 and the mold holder 21 or the mold conveying device. The cover member 13 is provided with openings 15, 15 at the left and right positions of the flange portion 13a of the cover member 13, and the upper surface of the flange portion 13a. opening 1 in
Horizontal cylinders 16, 16 in the outer positions of 5, 15
A casting flask 10 having hanging members 10a, 10a protrudingly formed so as to be able to be inserted through the openings 15, 15 is disposed below the cover member 13, and the hanging members 10a, 10a , the cylinder 16,
A gas-curing type venting device characterized in that through-holes 11, 11 are formed into which 16 piston rods 16a, 16a can be fitted, and further, a mold extrusion plate 18 is installed inside the cover member 13 so as to be movable up and down. Frame mold manufacturing equipment.