JPH0839187A - Lost foam pattern casting device - Google Patents

Abstract

PURPOSE:To miniaturize the whole lost foam pattern casting device in a low cost by unnecessitating a conventionally used turn-over device because molding sand after casting is recovered. by a vacuum suction device. CONSTITUTION:A hopper 11 making negative pressure state at the time of recovering the molding sand, a suction hose 10 connected with the hopper 11 and sucking the molding sand in a molding flask 15 and the vacuum suction device 13 which generates so sufficient negative pressure that the tip part of the suction hose 10 sucks the molding sand through the hopper 11, are arranged as the means for recovering the molding sand from the molding flask 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for performing a vanishing model casting method.

[0002]

2. Description of the Related Art The vanishing model casting method is a method in which a model made of styrofoam resin or the like is embedded in casting sand to form a mold, and the molten metal is poured in that state. The model is burnt by the molten metal and is replaced by the molten metal to become a casting.

In the above-mentioned casting method, since it is not necessary to add a binder to the casting sand packed around the Styrofoam resin model, it is easy to remove the mold after casting and reuse the casting sand. Since a mold can be produced by, it is effective when it is incorporated in a line and continuously cast.

In the conventional disappearance model casting apparatus, the product is taken out by lifting the casting frame upward and reversing it, and discharging the product together with the casting sand from the opening above the casting frame.

FIG. 3 shows the overall structure of the above-mentioned conventional disappearance model casting apparatus.

[0006] The disappearance model casting apparatus is a revolving casting line A composed of a roller conveyor and a belt conveyor.
A modeling unit 41 for making a mold, a pouring unit 42 for injecting a molten metal into the mold, and an inversion unit 43 for separating the molding sand and the product from each other are provided above. Further, a casting sand supply line B for collecting the casting sand discharged from the reversing section 43 and supplying it again to the modeling section 41 is provided. The white arrow indicates the direction in which the molding flask is conveyed, and the black arrow indicates the direction in which the casting sand is conveyed. As described above, the steps of mold making, pouring, unmolding, and product removal are repeatedly performed on the flask conveyed on the casting line A.

The operation of the reversing unit 43 in the vanishing model casting apparatus having the above structure will be described below with reference to FIG.

After the casting, the casting frame 51 conveyed by the roller conveyor 50 while being cooled is lifted upward by the reversing device 52 and inverted, and the product 53 together with the casting sand 54 is obtained from the opening above the casting frame 51. It is discharged to the hopper 55. Therefore, only the product 53 is taken out.

Since the casting sand 54 is used again as a mold, it is conveyed to a bucket elevator 57 via a screw conveyor 56 installed in the lower part of the hopper 55, and further passes through a belt conveyor 58 above to temporarily mix the drum. It is collected in 59.

As described above, the conventional disappearance model casting apparatus has a step of lifting the casting mold 51 upward and reversing it in order to discharge the casting sand 54. Then, from the opening above the inverted casting frame 51, the casting sand 5
4 by dropping the product 53 together with the product 53
Is taken out, the product 53 may be damaged.

Therefore, the casting frame 51 is tilted, the casting sand 54 is discharged until the upper portion of the product 53 is slightly exposed, and the upper portion of the product 53 is grasped and taken out from the casting frame 51. After that, there is a method in which the product 53 is not scratched by reversing the casting frame 51 in two steps by further reversing the casting frame 51 and discharging the remaining casting sand 54.

[0012]

However, in the vanishing model casting method, the casting sand itself is not solidified as a mold, but by filling the casting sand containing the vanishing model with the casting sand without a gap, The casting sand is used as a mold. Therefore, it is necessary to reliably hold the casting sand, and the casting frame itself is made quite sturdy, so the weight of the casting frame is considerably heavy.

That is, in the conventional construction, the reversing device used for discharging the casting sand and taking out the product is turned upside down by lifting a considerable weight of the above-mentioned flask containing the casting sand and the product. Since it is necessary to do so, it becomes a large scale and expensive. As a result, the entire disappearance model casting apparatus becomes expensive.

If it is desired not to damage the appearance of the product, the casting sand must be discharged in two stages as described above, and one reversing device is required for each stage. Therefore, there arises a problem that the configuration of the inversion unit becomes complicated as the number of steps increases.

[0015]

In the vanishing model casting apparatus of the present invention, in order to solve the above-mentioned problems, a casting sand storage container for storing casting sand recovered from the inside of a flask, and the casting sand storage. A sand sand suction pipe in which the base end portion is connected to the container and the tip end portion is inserted into the casting frame, and a negative load sufficient to suck the sand sand from the tip end portion of the sand sand suction pipe through the sand sand storage container A vacuum suction device for generating a pressure is provided.

[0016]

According to the above construction, since the casting sand is recovered from the casting frame not by the action of gravity but by the negative pressure generated by the vacuum suction device, the casting frame remains on the casting line. However, casting sand can be collected and products can be taken out. That is, since the casting sand can be collected and the product can be taken out without reversing the casting frame, the reversing device is unnecessary. Therefore, the entire disappearance model casting apparatus can be downsized and the cost can be reduced. In this case, the product can be easily taken out from above the casting frame, so that the product is not damaged. Moreover, since the sand is collected by suction, the sand is not scattered around the device.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following is a description of an embodiment of the present invention with reference to FIGS.

First, the entire structure of the disappearance model casting apparatus is shown in FIG.
It will be described based on. The vanishing model casting apparatus includes a molding section 1 for producing a mold, a pouring section 2 for injecting a molten metal into a casting frame, on a casting line A in which a casting frame 15 is orbited by roller conveyors 16 and 21 and belt conveyors 20 and 22. And
A product take-out section 3 is provided for separating the molding sand and the product. Further, the suction hose 1 serving as a casting sand suction pipe is provided on the casting sand supply line B for supplying the molding sand 1 again after collecting and cooling the casting sand discharged from the product takeout unit 3.
0, a hopper 11 as a casting sand storage container to which a vacuum suction device 13 is connected via a vacuum hose 12, a belt conveyor 17, a mixing drum 18, a bucket elevator 23, a casting sand cooling device 24, a bucket elevator. Data 25,
A belt conveyor 26 is provided. Further, a lid 11a called a so-called transfer lid is provided above the hopper 11. This lid 11a is
It has a function of separating the sucked air and the casting sand.

The white arrow indicates the direction in which the flask is conveyed,
Black arrows indicate the direction in which the casting sand is conveyed.

Here, FIG. 1 is a side view showing the product take-out section 3 and the structure of the casting sand supply line B up to the mixing drum 18.

The operation of the vanishing model casting apparatus based on the above configuration will be described below. In the molding unit 1, the casting frame 15 is filled with the disappearance model 19 and the casting sand. The casting frame 15 includes a roller conveyor 16, a belt conveyor 20 and a roller conveyor 21.
Thus, the molten metal is transported to the pouring unit 2 provided in the middle of the roller conveyor 21, and the molten metal is poured. Here, the disappeared model 19 is burned by the heat of the molten metal and replaced with the cast product 14. After that, the product 14 is conveyed to the product take-out section 3 provided on the roller conveyor 16 by the roller conveyor 21, the belt conveyor 22 and the roller conveyor 16 while being cooled together with the casting flask 15.

At the product take-out portion 3, the tip of the suction hose 10 connected to the hopper 11 is inserted into the casting frame 15. When the vacuum suction device 13 is operated, the hopper 11 connected to the vacuum suction device 13 by the vacuum hose 12
Becomes negative pressure, and suction of casting sand from the suction hose 10 is started. The casting sand separated from the air by the lid 11a is the hopper 1.
Recovered to 1. When the collection of the casting sand is completed, the product 14 is collected from above the casting frame 15 by a hand or a robot.

On the other hand, the casting sand collected in the hopper 11 is
It is conveyed to the mixing drum 18 by the belt conveyor 17 installed under the hopper 11. The recovered sand is
In the mixing drum 18, it is mixed with the supplied casting sand, and is transported to the casting sand cooling device 24 by the bucket elevator 23. The casting sand cooled here is conveyed to the modeling unit 1 by the bucket elevator 25 and the belt conveyor 26, and is filled in the casting frame 15 again together with the vanishing model 19. Casting is performed by repeating the above steps.

As described above, the casting sand that has been conventionally discharged and recovered by reversing the casting frame 15 is sucked by the suction device 1.
By using No. 3, since the molding flask 15 is recovered in a state of being located on the roller conveyor, it is not necessary to use an expensive and large-sized reversing device. Moreover, after the casting sand is collected, the product 14 can be easily taken out from above the casting frame 15, so that the product 14 is not scratched.

Even after cooling, the casting sand has a considerably high temperature. Therefore, for example, if a water pipe is attached to the suction hose 10 to cool the casting sand, the suction device including the suction hose can be used. While improving durability, the sand cooling system 2
4 simplifications are possible.

[0026]

As described above, the vanishing model casting apparatus of the present invention is a casting sand storage container for storing the casting sand recovered from the casting frame, and the casting end is connected to the casting sand storage container. A casting sand suction tube having a tip portion inserted into the frame, and a vacuum suction device for generating a negative pressure sufficient to suck casting sand from the tip portion of the casting sand suction tube through the casting sand storage container. This is the configuration provided.

As a result, the casting sand can be discharged and the product can be recovered without reversing the casting frame, so that the reversing device used conventionally is not required. Therefore, the casting line can be simplified and downsized, and the price can be reduced. Moreover, since the product can be easily taken out from above the casting frame, the product is not damaged.

[Brief description of drawings]

FIG. 1 is a side view showing a product take-out portion and a part of a casting sand supply line in a vanishing model casting apparatus according to an embodiment of the present invention.

FIG. 2 is a plan view showing the entire disappearance model casting apparatus.

FIG. 3 is a plan view showing an entire conventional disappearance model casting apparatus.

FIG. 4 is a side view showing an inversion section and a part of a casting sand supply line in the vanishing model casting apparatus shown in FIG.

[Explanation of symbols]

 3 Product take-out part 10 Suction hose (cast sand suction pipe) 11 Hopper (cast sand storage device) 11a Lid 12 Vacuum hose 13 Vacuum suction device 14 Product 15 Casting frame 16 Roller conveyor 17 Belt conveyor 19 Disappearance model

Claims (1)

[Claims] 1. A casting sand storage container for storing casting sand recovered from a casting flask, and a casting sand suction pipe having a base end portion connected to the casting sand storage container and a tip portion inserted into the casting flask. A vanishing model casting apparatus comprising a vacuum suction device for generating a negative pressure sufficient to suck the casting sand from the tip of the casting sand suction pipe via the casting sand storage container.