JPS6320442Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial field of application This invention relates to a casting device for manufacturing castings.

More specifically, the present invention relates to a casting apparatus using a fugitive casting model.

BACKGROUND ART Conventionally, this type of casting apparatus has generally been used as shown in FIGS. 6 to 8.

In the figure, a is a casting flask, and the inside thereof is filled with a filler b such as foundry sand. c is a fugitive model, which is made of styrofoam as an example. d indicates a sprue, and e indicates a runner. In FIG. 6, f is a gas vent, which is formed in a cylindrical shape, and has a large number of vent holes h in its side wall g.
is formed. i indicates a pump, and j indicates a communication pipe. Further, in FIG. 7, h is an air vent formed in the outer wall of the flask a. Also, in Fig. 8, k is the casting flask a.
It is an outer frame that is airtightly provided to the pump, i indicates the pump, and j indicates the communication pipe.

In Figures 6 to 8, molten metal is injected from sprues d, passes through runners e, reaches evanescent models c, gasifies and dissipates the models c, and casts to replace them. . Then, the gas generated in FIG. 6 enters the venting body f through the venting port h, is sucked by the pump i, and is discharged to the outside. Also, in FIG. 7, the generated gas is naturally exhausted from the vent h. In Fig. 8, the generated gas is discharged from the air vent h and enters the space l between the flask a and the outer frame k, after which it is sucked by the pump i and discharged to the outside. There is.

Problems to be Solved by the Invention However, each of the above-mentioned conventional devices has the following problems. That is, the device shown in Fig. 6 uses a large-capacity pump i to suck a large amount of gas in a short period of time.
Is required. Furthermore, a communication pipe j is required, and a connecting member (not shown) is required. Since the device shown in Fig. 7 allows the generated gas to be discharged naturally, the discharge is slow, and the pressure of the generated gas causes the molten metal to flow backwards through the runner e and into the sprue d. There may be cases where blowing up or casting cannot be performed. Furthermore, for the same reason, the walls of the packing may collapse or deform, making it difficult to manufacture a sound product.

The apparatus shown in FIG. 8, like the apparatus shown in FIG. 6, requires a large-capacity pump i, and also requires connecting pipes j and their connecting members (not shown). Further, since the outer frame k is provided outside the casting flask a, manufacturing is complicated. In addition, this device, like the one shown in Figure 6, is not suitable for automation in so-called continuous casting, in which a large number of flasks a are rotated in a planar manner and poured at a fixed location. be. This is because the evacuated gas f moves when formed in this way.
This is because it is troublesome to connect and disconnect the pump i which is fixed at a fixed location. This invention was made in order to solve these various problems, and its purpose is to eliminate the need for the pump i as described in the conventional example, and also to eliminate the need for the connecting pipes j and their connecting members. Moreover, it is an object of the present invention to provide a casting apparatus which can nevertheless vent the generated gas well, can prevent the above-mentioned backflow of molten metal, and can be easily automated by so-called continuous casting.

To describe this invention with reference to drawings showing an embodiment, in FIGS. 1 and 2, a casting flask 1 is filled with a filling material 2, and a flammable gas is generated in the filling material 2 by heating. A runner model 3 is buried, a runner 5 having a sprue 4 is communicated with the model 3, and a venting body 8 having a venting port 7 is provided in the side wall 6 in contact with the filling 2. This casting apparatus is characterized in that an ignition device 9 is provided above or near the top of the gas vent 8.

Function: First, the ignition device 9 is ignited to form the pilot fire 11. Next, the molten metal is injected from the sprue 4, reaches the fugitive film mold 3, decomposes it, and replaces it with casting. The combustible gas generated by the decomposition passes through the gaps in the filling 2 and reaches the vent 8, enters the interior through the vent 7, and rises. Gas removal 8
A pilot fire 11 is prepared in advance above or near the top, so that it ignites and burns. With this combustion, the gas in the combustion part becomes high temperature and rises. For this reason, the gas concentration in the vented gas 8 is reduced, and the gas in the gap of the filling 2 is forced to flow into the vented gas 8 where the gas pressure is lower.

Embodiment In FIG. 1, the filler 2 is suitably made of dry sand, ceramic grains, steel grains, refractory grains, or the like. The sprue port 4 is formed by ceramic molding, shell molding, or the like. Further, the fugitive model 3 was formed of styrofoam as an example.

Further, the gas vent 8 is made of gold wire, punch metal,
It is made of a number of materials with holes, such as steel wool.
A spiral pipe filter as shown in FIG. 4 was used in which a pipe 12 of the same diameter was welded.

This spiral pipe filter is made of steel, for example, and the air vents 7 are formed continuously. Due to its shape, it has high strength against external pressure. Further, the inner surface thereof is formed to have a convex cross-section, for example, and is formed to have high strength. Further, since the air vent port 7 has a cross-sectional shape that is narrow on the outside and wide on the inside, the filling material 2 is difficult to clog the air vent port 7. That is, it is formed to be easy to clean. 13 indicates a reinforcing material.

In addition, the vented gas 8 is fixed, for example, to the base 15 of the bottom 14 of the flask 1 by a port 16, but this can be freely attached and detached in the form of a wax mark on the base 15, although not shown. may be provided.

Next, the ignition device 9 can be of any type as long as it can ignite combustible gas, but as an example, a crater connected to city gas, propane gas, etc. was used.

To describe the operation of this embodiment, the gas vent 8
A part of the filling part 2 such as dry sand is filled into the bottom part 14 of the flask 1 where the mold is fixed, and a fugitive model 3 is placed on top of it.
and close to the gas vent 8. Also, a runner 5 having a sprue 4 is set in the vanishable model 3.

Next, the filling material 2 is filled until it reaches the upper part of the sprue 4. In this case, vibration is performed using a vibration device (not shown).

Next, the pilot fire 11 is ignited and molten metal is poured from the sprue 4. This molten metal causes the fugitive model 3 to gasify and disappear as described above, and casting is performed in the space after the disappearance. The decomposed gas 2 passes through the gap in the filling 2, enters the vent 8 formed by the spiral pipe filter through the vent 7, rises inside the body 8, and comes into contact with the pilot fire 11. ignites and burns. This combustion lowers the gas concentration in the lower part of the vented gas 8, making it easier for gas to enter the vented gas 8. It also promotes the rise. In this case, casting is performed in approximately constant time from pouring the metal to forming the casting.

Next, the apparatus of this invention can be used as a continuous manufacturing method, as shown in FIG. 5, for example. In the same figure, 17 is the rail, 18 is the flask 1
The casting flasks 1 are connected to each other by a chain (not shown) or the like, so that they are connected endlessly in a plane and can be moved intermittently by power. In addition, rail 1
7. The wheels 18, etc. may be replaced with rollers, etc., and the chain, etc. is omitted, and the flask 1, which is continuously placed on the rollers, is pressed and moved by a fluid pressure device using hydraulic pressure or the like. You can do it like this. Then, with the pilot fire 11 ignited at a fixed position 19 and the upper end of the gas vent 8 positioned below the fire 11, molten metal is poured into the sprue 4 and casting is performed. While combustion is occurring at the upper end of the gas vent 8, the poured flask 1 is moved, and the casting is taken out at a location not shown, and the fugitive model 3 is removed.
is set and the casting equipment is prepared. These are performed endlessly and intermittently rotated.

Effects of the invention This invention is constructed as described above, and the gas rising in the gas vent 8 is forcibly combusted above the gas vent 8, thereby solving all the problems of the conventional device. I can do it. That is, pump i
Also, there is no need for a connecting pipe j or its connector. In addition, gas can be vented well in spite of this, and backflow of molten metal can be prevented. It is also possible to provide continuous and automated casting equipment.

[Brief explanation of the drawing]

Figures 1 to 4 show an embodiment of this invention, and Figure 1 is a sectional view showing the casting process of the casting device;
FIG. 2 is a cross-sectional view of the casting apparatus showing a different process from that shown in FIG. 1. Fig. 3 is a cross-sectional view of a part of the device used in the casting device, Fig. 4 is a plan view of the same part, and Fig. 5 is a diagram showing another embodiment of the invention. 6, 7, and 8 are sectional views of conventional casting equipment, respectively. 1... Casting flask, 2... Filling, 3... Vanishing model, 4... Sprue, 5... Runway, 6... Side wall, 7...
... Air vent, 8... Gas vent, 9... Ignition device.

Claims (1)

[Scope of utility model registration request] A flask 1 is filled with a filler 2, a fugitive model 3 that generates flammable gas when heated is buried in the filler 2, and a runner 5 having a sprue 4 is communicated with the model 3; A casting apparatus characterized in that a gas vent 8 having a vent port 7 is provided in a side wall 6 in contact with the filling material 2, and an ignition device 9 is provided above or near the top of the gas vent 8.