JPS6021147A - Gas curing type molding device - Google Patents

Abstract

PURPOSE:To improve working environment without gas leakage by acting a negative pressure in the cavity part of a casting mold or pattern box and sucking a curing gas to cure the molding sand then sucking away the gas by a deodorizing device. CONSTITUTION:A gas curing type molding device has internally an evacuation chamber 2 on one side of which a vent hole 3 communicating with a gas discharge port 4 is provided. The chamber 2 has a gas discharge port 4. The port 4 is communicated with and connected to a deodorizing device 16 via a piping 15 interposed with a stop-valve 14 in the modway. The device 16 is communicated with and connected to a vacuum pump 18 via piping 19. When a negative pressure is generated in a receiver tank 13 by operating the pump 18 and the valve 14 is opened, the curing gas in a gas generator 11 is introduced into a casting flask 6 to cure molding sand S. The curing gas after curing is introduced into the device 16.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gas-curing mold making apparatus suitable for curing molding sand containing a gas-curing binder by passing a curing gas through the molding sand.

T-E-A (triethylamine), SO2 (sulfuric acid gas)
In the gas-curing mold making method, which uses toxic gases such as . However, this requires a large and complicated device, and it is difficult to completely prevent the curing gas from leaking to the outside. The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a gas-curing mold-making apparatus that can easily produce molds without gas leakage.

The configuration of the present invention will be explained below based on the embodiment shown in FIG.

(1) has a reduced pressure chamber (2) inside, and has a plurality of ventilation holes (3) on the top surface communicating with the reduced pressure chamber (2), and has a side wall surface that communicates with the reduced pressure chamber (2). Gas exhaust hole (
4) and a model (5) mounted on the upper surface, and the upper surface of this model plate (1) is equipped with a casting flask (
6) is positioned and placed. Furthermore, in the space defined by the model plate with model (1) and the flask (6), molding sand (S) containing a gas-hardening binder is placed approximately on the upper surface of the flask (6). Filled evenly on the same surface. Note that a vent plug (7) that allows only air to pass is embedded in the vent hole (3). (8) is a concave part (
9) and a gas suction hole (10) in the center that communicates with the recess (9), and the cover member (8) is placed on the upper surface of the flask (6). ing. (11) is a gas generator that stores hardening gas such as triethylamine gas or sulfuric acid gas, and the gas generator (11) is connected to the gas suction hole (10) of the cover member (9) through a pipe (12). It is connected for communication. (13) is a receiver tank, which is connected via a pipe (15) with an on-off valve (14) inserted in the middle. (16) is a deodorizing device;
6) has one end connected to the receiver tank (13) via piping (17), and the other end connected to the vacuum pump (13).
8) via piping (19).

Next, the operation of FIG. 1 configured as described above will be explained. Place the casting flask (6) on the top surface of the model plate with model (1),
The space defined by the model plate with model (1) and the flask (6) is filled with molding sand (S) containing an organic binder to form the upper surface of the flask (6). After leveling so that they have the same curve, cover members (8) are placed on the two sides of the casting flask (6) in an airtight manner, and the vacuum pump (18) is activated.
When the vacuum pressure inside the receiver tank (13) is sufficiently increased and the on-off valve (14) is opened, the inside of the flask (6) instantly becomes negative pressure, and the hardening gas inside the gas generator (11) is released into the flask ( 6) Due to the high negative pressure in the molding flask, the molding sand (S) flows into the flask (6) and passes through the molding sand (S) in the flask (6).
After curing in a short time, vent plug (7), ventilation hole (3), decompression chamber (2), gas exhaust hole (4), and piping (
15), enters the receiver tank (13), is further suctioned and removed by the deodorizing device (16) via the piping (17), and only clean air is exhausted to the outside. After this, remove the cover member (8) and continue to remove the vacuum pump (18).
After the curing gas in the flask (6) is removed by suction, the on-off valve (14) is closed and the model plate with model (
1) is released from the mold and the molding is completed.

Next, another embodiment of the present invention will be described based on FIG.

Components having the same configuration as those in FIG. 1 will be designated by the same reference numerals and their explanation will be omitted.

(21) is a vertically split model box that has a cavity (22) with an open top surface inside, and the model box (21) has a vacuum chamber (22) at the bottom.
23), and a vent hole (24) communicating with the decompression chamber (23) on the side and bottom surface of the cavity (22).
A plurality of gas exhaust holes (25) are provided on the outer surface of the model box (21) and communicate with the decompression chamber (23). Open/close valve (14)
The receiver tank (
13). (26) has four parts (2
7) and a gas suction hole (28) in the center that communicates with the recess (27), the cover member (26) has a cavity ( 22) is placed so as to cover the upper opening of the gas suction hole (22).
8) is connected to a gas generator (11) via a pipe (12).

Next, to explain the operation shown in FIG. 2 configured as above, in the state shown in FIG. 2, the receiver tank (13) is After creating a high vacuum pressure inside, open and close the on-off valve (1
4) When opened, the inside of the cavity (22) of the model box (21) is instantly made negative pressure, and the hardening gas inside the gas generator (11) flows through the pipe (12), the gas suction hole (28), It flows into the cavity (22) through the fourth part (27), passes through the molding sand (S) in the cavity (22), hardens the molding sand (S) in a short time, and then flows into the air hole (24). ), decompression chamber (23), waste exhaust hole (
25) and piping (15) to the receiver tank (13).
) and then goes through the pipe (17) to the deodorizing device 1f.
(16), and only clean air is exhausted to the outside. Thereafter, the cover member (26) is removed and the vacuum pump (18) is operated to suction and remove the hardening gas in the cavity (22), and the on-off valve (14) is closed to remove the model box (21). The hardened mold is removed and the molding process is completed.

In the embodiments shown in FIGS. 1 and 2, the vacuum pressure in the receiver tank (13) is increased, and this vacuum pressure causes the hardening gas to flow into the foundry sand (S) at once. , S), the gas exhaust hole (25) of the model box (21) and the deodorizing bag fif
In the middle of the pipe connecting (16), there is a receiver tank (13).
Although the receiver tank (13) is provided, it is of course possible to create the model without the receiver tank (13).

As is clear from the above description, according to the present invention,
After the molding sand in the flask or model box is hardened by applying a negative pressure inside the cavity of the flask or model box to suck in the hardening gas, it is removed by suction using a deodorizing device to prevent gas leakage. This method has excellent effects such as keeping the working environment clean and ensuring the safety of workers, as well as being able to produce gas molds with simple equipment, and has a significant effect on this type of industry.

[Brief explanation of the drawing]

FIG. 1 is a device diagram showing an embodiment of the present invention, and FIG. 2 is a device diagram showing another embodiment of the invention.

Claims (1)

[Claims] 1. The above-mentioned gas of a model device having a decompression chamber inside, a ventilation hole communicating with the decompression chamber on the negative side, and a gas exhaust hole communicating with the decompression chamber on the outer surface. A gas-curing mold making device, characterized in that a deodorizing device is connected to the exhaust hole through a pipe with an on-off valve interposed therebetween, and a vacuum pump is connected to the deodorizing device through the pipe. 2. Claim 1, characterized in that a receiver tank is provided in the middle of the piping connecting the on-off valve and the deodorizing device.
The gas-curing mold making device described in Section 1.