JP3040074U - Sand fall prevention device for molding machine - Google Patents

Abstract

(57) [PROBLEMS] To prevent foundry sand falling from a blow head of a molding machine during casting from falling into a sand receiving port of a mold. A mold having a sand receiving port on the upper surface that communicates with a mold formed inside a fixed mold and a movable mold that is movable back and forth with respect to the fixed mold, and a mold above the mold and In the mold forming machine, which is provided on the lower side of the hopper which is located on the side and is connected to the sand tank, is vertically movably and horizontally movable, and which is provided with a blower head having a sand blower outlet at the bottom thereof, 4, air-cylinders 8 are attached to the lower sides of the cylinders 4 respectively, and a shutter plate 14 is provided at one end of a piston rod 10 existing in the cylinder so as to cover the lower surface of the blower head so as to be opened and closed. is there.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a sand fall prevention device for preventing casting sand falling from a blower of a mold molding machine, particularly a core molding machine during casting from falling into a sand receiving port of a mold.

[0002]

[Prior art]

 Conventionally, a blower head of a core molding machine for casting casting blows sand with a thermosetting resin coated therein by applying pressure into a core mold provided inside a mold. Therefore, when it moves to a position above the sand receiving port provided on the upper surface of the mold and stops, the sand adhering to the vicinity of the sand blowing port of the blow head naturally drops on the mold due to vibration and the like. The sand dropped in the sand receiving port is solidified in the core mold. In this case, since the sand falls naturally, the density of the sand becomes coarse.

Here, a fine particle material (natural sand, artificial sand or a substance replacing it) coated with a thermosetting resin which is a core material is blown from a sand receiving port provided on the upper surface of the mold. A core with a dense sand is manufactured along the inner surface of the core mold, and the core is used to improve the accuracy of the surface of the casting surface of the casting product.

[0004] The molding sand to which pressure is applied by compressed air is blown into the core mold, but the sand that has already fallen into the core mold of the mold already has a thermosetting resin such as a resin. Since it is tinged with heat, it hardens due to heat and creates rough parts on the surface of the finished core. In the castings cast using this core, the rough part is reflected on the surface of the casting surface, the surface of the casting is rough, and a product with poor accuracy is finally produced, resulting in poor product quality. Had.

[0005]

[Problems to be solved by the device]

 As described above, in order to prevent the generation of defective cores or molds having a rough sand part partially generated on the core or mold surface due to sand falling from the blow head, the moving blow head Cover the underside of the unit with a sand fall prevention device to prevent casting sand from falling onto the mold. An object of the present invention is to prevent foundry sand falling from a blower head of a molding machine during casting from falling into a sand receiving port of a mold.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention provides a mold comprising a fixed mold and a movable mold provided so as to move back and forth with respect to the fixed mold, the sand receiving port communicating with the mold being formed on the upper surface of the mold. The blower head is connected to the lower part of the hopper that is connected to the sand tank located above and on one side so that the blower head can be moved up and down and left and right, and the sand outlet is provided at the lower part of the blower head. In the mold forming machine having the blow head, a pair of air cylinders are attached to both sides of the lower portion of the blow head, and one end of a piston rod existing in the cylinder covers the lower surface of the blow head so that the shutter can be opened and closed. The feature is that the plate is provided so as to be movable left and right.

It is preferable to provide a brush piece on the lower surface of the tip of the shutter plate.

With the above construction, when the blower head moves, the lower surface of the blower head is covered with the shutter plate, so that the sand blowout port of the blower head is affected by vibration or the like generated during the movement. Even if the foundry sand adhering to it and its surroundings fall, it is deposited on the shutter plate covering the upper surface of the mold and is prevented from falling on the mold. It does not form a defective core with parts.

[0009]

[Embodiment of the invention]

 An embodiment of the present invention will be described with reference to the drawings. In FIG. 1, a blower head 4 provided at a lower portion of a hopper-2 connected to a sand tank (not shown) is provided above a mold described below. Moreover, it is arranged on one side so as to be movable up and down and left and right, and a sand blowout port 6 having an arbitrary shape is formed on the bottom surface of the blow head 4.

Piston rods 10 and 10 mounted on the respective cylinders of air cylinders 8 and 8 which are paired with the blower head 4 in parallel with the left and right direction of movement and are mounted on both sides of the blower head 4. A shutter plate 14 for opening and closing the lower surface of the blow head and the mold 20 via a connecting plate 12 is attached to one end of the shutter so as to be movable in the left-right direction. The shutter plate 14 is formed in a rectangular shape, and has a reinforcing function at the upper end of its tip, and if sand remains on the shutter plate when the shutter plate moves, the sand will be removed. A rising piece 17 having a function of a stopper to prevent the falling is provided, and a brush piece 18 for cleaning the die when the shutter plate 14 moves back and forth is provided at the lower end of the tip. It is installed. In the present embodiment, a plurality of air cylinders are used, but it goes without saying that one air cylinder may be used.

Reference numeral 20 denotes a mold, and a pair of a fixed mold 22 formed in a half-divided shape and a movable mold 24 attached to the fixed mold so as to be movable back and forth as indicated by an arrow D in FIG. It has been formed. A sand receiving port 26 is provided on the upper surface of the joint between the two, and a core mold (not shown) is formed inside the mold so as to communicate with the sand receiving port 26. The mold 20 is equipped with a heating device (not shown) for curing a thermosetting resin such as a resin, but the heating device is not necessary when casting is performed by another gas curing method. Further, the fixed die 22 is located at a fixed position, and the movable die 24 is configured to be attached to the fixed die 22 so as to be movable back and forth so that the finished core can be taken out.

Next, the operation of the present embodiment will be described. In the case of forming a core for manufacturing a casting, as shown in FIG. 1, the blower head 4 is moved in the direction of arrow X so that it is provided on the lower surface. In order to prevent the foundry sand from naturally falling from the sand blow-out port 6, the shutter plate 14 is moved to the lower surface of the blow head 4 with the shutter plate 14 being positioned, and then the mold 20 Located above (Fig. 2).

While the blower head 4 moves in the direction of arrow X in FIG. 1, the molding sand adhering to the inside or the peripheral surface of the sand blowout port 6 provided on the lower surface of the blower head may be affected by vibration or the like. In order to prevent the blower head from dropping onto the mold 20, the blower head is moved while being covered with the shutter plate 14. In this case, even if the foundry sand adhering to the periphery of the sand outlet 6 falls due to vibration or the like, since the lower surface of the blow head 4 is covered by the shutter plate 14, the found foundry sand 19 falls. It deposits on the shutter plate 14, but does not fall on the mold 20.

Next, air is supplied to the cylinders 8, 8 mounted on both sides of the blow head 4 positioned on the mold 20 to move the piston rods 10, 10 of the cylinder in the direction of arrow Y. Move forward (Fig. 3). In this case, as shown in FIGS. 1 and 2, foundry sand adhering to the vicinity of the sand outlet 6 of the blow head 4 located on the mold 20 is generated when the blow head moves. Although it falls due to vibration or the like, the foundry sand does not fall on the mold 20 because it is deposited on the shutter plate 14. Therefore, since the sand does not fall inside the sand receiving port 26 of the mold 20, no rough portion of the sand is generated on the surface of the core.

Further, by lowering the blower head 4 shown in FIG. 3 toward the die 20 in the direction of arrow Z, the lower surface of the blower head 4 is brought into contact with the upper surface of the die 20, The sand blow-out port 6 of the blow head and the sand receiving port 26 of the mold 20 are aligned with each other, and the molding sand is pressed into the core mold provided in the mold 20 together with the molding sand pressurized by air. (Fig. 4).

After the press-fitting of the molding sand into the core mold is completed in the state shown in FIG. 4, the mold 20 is heated while the blow head 4 is lifted and returned in the direction of arrow E (FIG. 5). To cure the thermosetting resin coated on the molding sand. In this case, the positional relationship among the mold 20, the blow head 4, and the shutter plate 14 is as shown in FIG.

As shown in FIG. 5, after the work of filling the molding sand for the core with the molding sand is completed, the shutter plate 14 is moved in the direction of the arrow F, so that the blower is blown as shown in FIG. The lower surface of the head 4 is covered with a shutter plate 14.

Next, the blow head 4 whose lower surface is covered by the shutter plate 14 is moved in the direction of arrow M as shown in FIG. 7 to return to the original position shown in FIG. One process of core molding work is completed.

Not only the method for manufacturing the core and the mold using the molding sand coated with the thermosetting resin described in the embodiment of the present invention, but also the phenol resin and the polyisocyanate Was mixed with sand and filled in a mold, and then the amine was vaporized and aerated to be gasified using an amine cold box method or an alkaline phenolic resin that cures at room temperature. Of course, it can be applied to a molding method for producing a core or a mold by a gas curing method such as an ester cold box method in which an ester is reacted.

Further, although the sand drop prevention device described in the present embodiment has been particularly described for the core molding machine, the present invention is not limited to this. That is, it goes without saying that the present invention can be applied to a mold molding machine that manufactures a mold using foundry sand.

[0021]

[Effect of the invention]

 According to the present invention, when foundry sand adhering to the vicinity of the sand blowout port of the blow head falls onto the mold during mold making, the resulting mold has a rough part on the surface of the mold. Therefore, the lower surface of the moving blow head is covered with a shutter plate that can be opened and closed to prevent sand from falling onto the mold, thereby further reducing defective products of the mold. Further, since the shutter plate for preventing the falling of sand is mounted on the molding machine and operates separately, it can be retrofitted easily to the existing molding machine, which is extremely convenient.

[Brief description of the drawings]

FIG. 1 is a partially omitted front view showing an original positional relationship between a blow head and a mold.

FIG. 2 is a partially omitted front view showing a state in which a blower head is moved above a mold and stopped at a sand blowing position.

FIG. 3 is a front view of a state in which a lower surface of the blower head is exposed by moving a shutter plate located on the lower surface of the blower head located on the mold.

[Fig. 4] Lowering the blower head and crimping it onto the mold,
It is the front view which abbreviate | omits a part which shows the state which blows the molding sand which added the pressure into the mold for cores provided in the inside of this metal mold | die.

FIG. 5 is a partially omitted front view showing a state in which the blower head has been lifted up and returned to the upper side of the mold after the press-fitting operation of the molding sand is completed.

6 is a sectional view taken along line AA of FIG.

7 is a partially omitted front view showing a state where the shutter plate is moved and returned to the lower surface of the blow head, and then the blow head is moved together with the shutter plate to return to the original position shown in FIG. is there.

[Explanation of symbols]

 2 Hopper 4 Blow head 6 Sand blowout port 8 Cylinder 10 Piston rod 14 Shutter plate 20 Mold 22 Fixed type 24 Movable type 26 Sand receiving port

Claims (2)

[Utility model registration claims] 1. A mold comprising a fixed die and a sand mold inlet formed on the inside of a movable die provided so as to be movable back and forth with respect to the fixed die and communicating with a mold. In a mold forming machine having a blower head connected to the lower part of a hopper connected to a sand tank located on the side so that the blower head can be moved up and down and left and right, and having a sand blow outlet at the lower part of the blower head. , Paired with air on both sides of the lower part of the blow head.
A sand fall prevention device for a mold forming machine, wherein a cylinder is mounted, and a shutter plate that covers the lower surface of the blow head so as to be openable and closable is provided at one end of a piston rod existing in the cylinder so as to be movable left and right. 2. The sand drop prevention device for a mold molding machine according to claim 1, wherein the shutter plate is provided with a brush piece on a lower surface of a front end thereof.