JPS61238442A - Gas venting device for casting core - Google Patents

Abstract

PURPOSE:To eliminate wasteful spaces, reduce the consumption of gas and to improve the efficiency in curing of a core by incorporating a gas blowing box to the inside of a guide cylinder and connecting the aperture edge of a vessel and the aperture edge of the guide cylinder by a tube. CONSTITUTION:Stop valves 14, 15, 17, 18, 21 are closed, an air compressor and a suction device are started and the valve 17 is opened. The air in the vessel 1 is then sucked and evacuated and the tube 5 is attracted to the inside wall of the vessel 1. The vessel 1 is pulled up by an air cylinder 8 and a core mold 6 is imposed to a suction box. The vessel 1 is lowered by the cylinder 8 and is locked. A gas suction box 4 is brought into press contact with the core mold 6 by a press contacting cylinder 3 and the valve 17 is closed. The tube 5 expands and is brought into press contact with the outside wall of the mold 6 so as to close the circumferential space when the valves 18, 21 are opened. Air for purging is thereafter introduced into the vessel by opening the valve 15 after opening the valve 14 to blow the gas then closing the valve, then the gas is forcibly passed through the inside of the core mold 6 are reacts by contacting with the solvent of the core sand packed into the mold 6. The gas is discharged through the suction box 7.

Description

[Detailed Description of the Invention] Conventionally, a gas supply device for casting cores for production of a wide variety of products in small quantities has a first
Although there are devices as shown in FIGS. 2 and 3, they all have many drawbacks and have not become widely used.

FIG. 1 shows an apparatus in which a core mold 6 is placed in a container 1, a gas blowing box 4 is crimped onto the core mold 6, and gas is passed through while suctioning through a suction box 7. The gas blowing box must be replaced each time depending on the size and shape of the core mold 6.

Furthermore, in order to prevent gas leakage, all the split surfaces of the core mold 6 must be sealed, which increases the manufacturing cost of the core mold 6.

Figures 2 and 3 show equipment for passing gas in a vacuum atmosphere.
FIG. 2 shows a vacuum container in which the container 1 is raised and lowered by an air cylinder 8 and is crimped onto a suction box 7 to seal it, and FIG. 3 shows a horizontal vacuum container with a door 9 on one side. All core type 6
The container 1 is placed in a vacuum state by suction with a vacuum pump, the opening/closing valve 21 is closed, and the gas inlet 1 is closed.
This is a device that blows gas from zero.

However, the disadvantage of all of these devices is that by blowing gas into a container that has been previously evacuated, the degree of vacuum deteriorates significantly, slowing down the rate of gas diffusion, and slowing down the hardening of the core. Time consuming and inefficient.

Furthermore, the gas existing in the space between the core mold 6 and the container 1 is exhausted without contributing to the hardening of the core, so the gas is wasted.

The present invention provides a gas supply device for casting cores for producing a wide variety of products in small quantities, which eliminates the drawbacks of conventionally known devices as described above and can produce casting cores efficiently and at low cost.

The structure of the present invention will be explained below with reference to FIGS. 5 and 6'. A pressure-bonding cylinder 3 is attached to the top plate of a container 1 equipped with a guide tube 2, and a gas cylinder having a large number of small holes 11 in the bottom plate is attached. The blowing box 4 is fixed to the tip of the crimp cylinder 3 so as to slide on the guide tube 2. The gas blowing box 4 is
It is connected to a pipe 13 through a flexible tube 12 such as a rubber hose, and the pipe 13 branches into on-off valves 14.1, respectively.
5 and a pressure reducing valve, it leads to a gas tank and a purge air tank.

In addition, both ends of a tube 5, which has approximately the same diameter as the container 1 and has a length approximately 25 times the radius, are tightly fixed to the opening imaging portion of the container 1 and the opening imaging portion of the guide tube 2, and are tightly fixed to the inner wall of the container 1. During the 6th
Form a closed room as shown in the figure.

The tube 5 is made of a material that is flexible, non-breathable, and non-stretchable.

The upper part of the closed chamber is connected to a pipe 16, which branches and passes through on-off valves 17 and 18, respectively, to a suction device and an air compressor via a flexible tube such as a rubber hose.

The suction box 7, which has a large number of small holes 19 on its upper surface, is connected to a suction device through an on-off valve 21 and a steel pipe. Further, the container 1 is raised and lowered by an air cylinder 8, and a locking device 20 is installed on the outer rim of the container 1, which is locked with the suction box 7.
It is equipped with

To explain the operation of this device with the above configuration, first, with the on-off valves 14, 15, 17, 18, and 21 closed,
When the air compressor and the suction device are activated and the on-off valve 17 is opened, the air in the closed chamber of the container 1 is suctioned and exhausted, and the tube 5 is adsorbed to the inner wall of the container 1 as shown in FIG.

Next, the container 1 is pulled up by the air cylinder 8, the core mold 6 is placed on the suction box, and the container 1 is lowered by the air cylinder 8 and locked by the locking device 20.

Next, the gas blowing box 4 is crimped onto the core mold 6 using the crimping cylinder 3, and the on-off valve 17 is closed.
When 8.21 is opened, the tube 5 is expanded by compressed air and is pressed against the outer wall of the core mold 6, closing the surrounding space.

In this case, the air pressure is reduced in advance so that the gas blowing box 4 is not pushed back by the tube 5.

Next, the on-off valve 14 is opened and gas is blown in for a predetermined period of time and then closed, and the on-off valve 15 is opened to introduce purge air. As a result, the gas is forcibly passed through the core mold 6, reacts with the solvent of the core sand filled in the core mold 6, and is exhausted through the suction box 7. After evacuation for a predetermined time, the on-off valve 15 is closed, and the on-off valve 17 is opened to allow the tube 5 to be adsorbed to the inner wall of the container 1.

Next, the gas blowing box 4 is pressed by the crimp cylinder 3.
Then, the locking device 20 is released, the container 1 is pulled up using the air cylinder 8, and the core mold 6 is taken out.

A series of these operations are electrically remotely controlled and automatically operated independently or in conjunction with each other.

As described above, this device has the following advantages.

B. Gas consumption is reduced because there is no wasted space regardless of the size or shape of the core.

Forced gas flow from port 1 allows the core to harden quickly, improving efficiency.

Since the core mold is completely wrapped in the tube, there is no gas leakage and there is no need to seal the split surface of the core mold.

This invention, which has excellent advantages as described above, can be said to be an industrially useful invention as a gas supply device for casting cores for production of a wide variety of products in small quantities.

[Brief explanation of drawings]

1 is a container 2 is a guide tube 3 is a crimp cylinder 4 is a gas blowing box 5 is a tube 6 is a core type 7 is a suction box 8 is an air cylinder 9 is a door

Claims (1)

[Claims] A gas blowing box 4 that slides with a crimp cylinder 3 is built into the inside of a guide tube 2 provided in the container 1, and the opening portion of the container 1 and the opening portion of the guide tube 2 are made flexible. A gas supply device for a casting core, which is connected by a non-porous, non-stretchable tube 5.