JPH08206781A - Molding machine - Google Patents

Abstract

PURPOSE: To manufacture a hollow core of small size by providing a casting sand feeding mechanism consisting of a measuring cup having an opening to agree with a hopper outlet on one position and communicated to a void of a head at the other position to feed the casting sand of the amount equivalent to the cavity volume. CONSTITUTION: A molding machine is provided with a head 2 having a void part 2c provided with an opening part 2b which is sealably abutted on the periphery of an opening 3 communicated with the cavity C of a die 1, a mechanism which brings the opening part 2b of the head into contact with an opening 31 and feeds the casting sand, a mechanism consisting of a mechanism 14 to feed the compressed air and an ejector 12 to suck the gas in the void part 2c. A casting sand feeding mechanism consists of an upper opening 10a which agrees with a lower opening 10a'' of a casting sand hopper H on one movable position, and a measuring cup 10a' which agrees with a hole 8 communicated with the void part 2c at the other movable position. The casting sand whose amount is equivalent to the volume of the cavity C is fed, and the uncured casting sand can be rapidly removed to manufacture a hollow core of small size.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molding machine, and more particularly to a molding machine suitable for producing a hollow core.

[0002]

2. Description of the Related Art Conventionally, in order to manufacture a shell core with a molding machine of this kind, for example, a mixture of sand and a coating agent containing phenol resin as a binder and hexamethylenetetramine as a curing agent has been obtained. The molding sand is filled in the cavity of the heated mold including the upper mold and the lower mold.

Further, in order to manufacture a hollow shell core,
Before the center portion of the core is hardened, the mold is inverted to discharge the uncured molding sand, or the uncured molding sand is sucked and removed.

[0004]

However, in the above conventional mold making machine, when forming a hollow in the mold,
There is the trouble of having to reverse the mold and replace the casting sand supply head with a suction head, and in the case of a relatively small mold, for example, a core of a small core, reverse the mold or replace the head. In the meantime, the center has hardened,
There is a problem that a hollow core cannot be obtained.

Therefore, the present invention has been made in order to solve the above-mentioned drawbacks, and an object of the present invention is to provide a mold making machine in which a hollow core can be easily obtained.

[0006]

In order to achieve the above object, the mold making machine according to the present invention blows molding sand into a cavity provided in a heated mold to form a hardened layer. After that, a mold making machine for producing a hollow core by discharging uncured molding sand, comprising an opening that is hermetically abutted around the opening leading to the cavity provided in the mold. A head having a space portion, a head moving mechanism for moving an opening portion of the head in a direction of abutting the opening portion, and a head moving mechanism for moving the head portion in a direction away from the opening portion; The foundry sand supply mechanism, the compressed air supply mechanism that supplies compressed air to the space of the head when the opening of the head is in contact with the opening, and the opening of the head contacts the opening. When being touched In, having a suction mechanism for sucking gas in the space of the head, the molding sand supply mechanism, the upper part that coincides with the lower opening of the hopper where the molding sand is stored when moved to one position. With an opening,
It is characterized by comprising a measuring cup having a lower opening which coincides with a hole communicating with the space of the head when moved to the other position. Further, the cavity is characterized by being provided horizontally.

[0007]

In the above structure, when compressed air is supplied to the space of the head through the compressed air supply mechanism when the head is in contact with the opening of the mold by the head moving mechanism,
The foundry sand in the space is supplied into the cavity to form a hardened layer. Then, when the gas in the space of the head is sucked by the suction mechanism, the uncured molding sand in the cavity is sucked and removed to manufacture the hollow core. By moving the measuring cup, the molding sand measured by the measuring cup is supplied into the space.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration diagram of a mold making machine according to an embodiment.

The mold 1 is composed of an upper mold 1a and a lower mold 1b, like a well-known mold for manufacturing a shell core, and has an outer shape of the core on the mating surfaces of the two molds 1a and 1b. A cavity C is formed.

The upper mold 1a and the lower mold 1b are provided with burners (not shown), and have a predetermined temperature, that is, a predetermined temperature necessary for hardening the molding sand, for example, 250-2.
It is heated to 90 ° C. Further, the upper mold 1a is provided with a cylinder (not shown), and is configured so that it can be moved up and down as shown by an arrow while being guided by the guide rods R, R ...

The head 2 is constructed so as to come into close contact with the periphery of an opening 3 communicating with a cavity C provided in the mold 1. That is, the head 2 has a space that is open on the side of the opening 3 and is movably provided in the left and right (horizontal) directions by a cylinder 4 that is driven by air or hydraulic pressure, as will be described later, and has moved to the left. At times, it is configured so as to contact the periphery of the opening 3 in a sealed manner.

A contact piece 2a containing a water-cooling pipe (not shown) is provided on the side of the head 2 facing the opening 3, and the contact piece 2a has a position facing the opening 3. And the opening 2b having the same size is provided. Therefore, when the contact piece 2a is brought into contact with the periphery of the opening 3 by the cylinder 4, the space 2c provided inside the head 2 and the cavity C can be airtightly connected to each other. It is possible to effectively prevent the molding sand from closing the opening 2b by being heated when the mold 2 comes into contact with the mold 1.

The capacity of the space portion 2c is determined so as to be compatible with a large number of cores in order to accommodate various kinds of cores. The opening 2 is provided in the space 2c.
A baffle plate 2d is provided, which faces downward on the b side and has a lower end opened. In addition, in the space 2c,
A nozzle 5 directed toward the center of the opening 2b is provided. The nozzle 5 is provided so as to penetrate the baffle plate 2d, and the space 6 on the side opposite to the opening 2b is formed by the cylinder 6.
The nozzle 5 is configured to be movable so that it can be sealed, and a valve 5a that is controlled to open and close by a cylinder 7 is provided in the nozzle 5.

A hole 8 is provided in the upper part of one space 2c 'on the side of the opening 2b divided by the baffle 2d.
A metering mechanism and a compressed air supply pipe, which will be described later, are connected to each other, and a compressed air supply pipe 9 having a valve V1 is connected to the other space 2c ".

The measuring mechanism 10 is composed of a measuring cup 10a having upper and lower portions, which are determined corresponding to the capacity of the cavity C, and a cylinder 10b for horizontally moving the measuring cup 10a. Measuring cup 10a
Is determined to be almost equal to the capacity of the cavity C.

As shown in FIG. 1, when the measuring cup 10a is moved to the right by the cylinder 10b and positioned,
The lower opening H'of the hopper H of the foundry sand and the upper opening 10a 'of the measuring cup 10a are aligned so that the foundry sand in the hopper H can be filled in the measuring cup 10a. Further, this measuring cup 10a, as shown in FIG.
When the cylinder 10b is moved to the left and positioned, the lower opening 10a ″ of the measuring cup 10a coincides with the hole 8 so that the molding sand in the measuring cup 10a can be discharged into the space 2b of the head 2. The lower opening H'of the hopper H can be closed at this position.

A suction pipe 11 having a valve 11b controlled by a cylinder 11a is provided below the space 2c of the head 2.
The suction pipe 11 is connected to the suction side of the ejector 12. Compressed air for driving the ejector 12 is supplied to the ejector 12, and the exhaust side of the ejector 12 is connected to a return sand hopper Ha provided in the hopper H. ing. This return sand hopper H
A discharge pipe 13 having a valve 13b controlled by a cylinder 13a is provided in the lower part of a. The lower end of the discharge pipe 13 is directed to the lower opening H ′ of the hopper H. Therefore, by controlling the opening / closing of the valve 13b, the return sand can be mixed with the new casting sand in the hopper H in a predetermined amount.

Reference numeral 14 in the drawing is a compressed air supply mechanism, which has a cylinder 15 in which the center of the drive shaft is formed hollow to form a compressed air supply pipe 15a. The axial direction of the compressed air supply pipe (driving shaft) 15a is provided vertically, and a lower end of the compressed air supply pipe 15a is provided with an abutting piece 15a 'that abuts around the hole 8. . A valve V2 is provided in the compressed air supply pipe 15a on the side opposite to the side where the contact piece 15a 'is provided, so that compressed air is supplied. Although not shown, the contact piece 15a 'is provided with an adjusting plate for adjusting the aperture ratio.

In order to manufacture a hollow core in the mold making machine having the above-described structure according to this embodiment, first, as shown in FIG. 1, the upper mold 1a and the lower mold 1b are set as shown in FIG. Then, the cavity C is formed. Then, as shown in FIG. 1, in a state where the head 2 is separated from the mold 1, the molding sand is measured by the measuring cup 10a as described above.

Next, as shown in FIG. 3, the cylinder 5 closes the valve 5a and the cylinder 6 brings the nozzle 5 into contact with the space 2c.
By driving b, the molding sand in the measuring cup 10a is discharged through the hole 8 into one space 2c 'of the space 2c. Then, after the contact piece 2a of the head 2 seals the periphery of the opening 3 by driving the cylinder 4 (see the state of FIG. 3), as shown in FIG. 4, the cylinders 6, 7 are driven to drive the valve 5a. , The nozzle 5 is retracted. Further, the cylinder 15 is driven to lower the compressed air supply pipe 15a so that the contact piece 1 is attached to the periphery of the hole 8.
5a 'is brought into contact and sealed, and in this state, compressed air is supplied from the nozzle 5 and the compressed air supply pipes 9 and 15a. As a result, the foundry sand in the space 2c is entrained in the compressed air and filled in the cavity C.

After the molding sand on the wall surface of the cavity C hardens, the cylinders 6 and 7 are driven to move the nozzle 5 and the valve 5a forward to the position shown in FIG.
1a is driven to open the valve 11b, and further the ejector 1
Compressed air is supplied to 2 to start the suction operation. As a result, the interior of the space 2c is in a vacuum state, and the uncured molding sand in the cavity C is removed by suction to form a hollow core. The foundry sand removed by suction is sent to the return sand hopper Ha for reuse.

The hollow core in the cavity C is driven by driving the cylinder 4 to move the head 2 to the right and separating it from the mold 1, and then the upper mold 1a is moved upward and the cavity C is opened and taken out. To be done. Then, the cavity C is formed again, and the manufacturing process of the hollow core is started.

As described above, the mold making machine according to this embodiment can blow the molding sand through the head 2 and remove the uncured molding sand through the head 2, so that the uncured molding can be removed. Sand can be quickly removed, and it is possible to form a hollow even with a core having a small core, and a core having a diameter of about 5 mm can be sufficiently formed.

Further, since the measuring mechanism having the measuring cup 10a is provided between the hopper H and the hole 8, the molding sand matching the cavity C can be supplied without excess or deficiency, and the molding sand can be efficiently supplied and not supplied. The hardened molding sand can be discharged.

In the above-mentioned embodiment, the cavity C is kept horizontal, the molding sand is supplied horizontally, and the uncured molding sand is horizontally removed. Alternatively, the removal of the uncured molding sand may be directed upwards or downwards while being directed upwards. But,
When the molding sand is supplied and removed horizontally as in the above-described embodiment, the molding sand can be effectively charged and discharged.

[0026]

According to the mold making machine of the present invention, a head having a space portion having an opening which is hermetically abutted around an opening communicating with a cavity provided in a mold, and an opening of the head. While moving the part in the direction of contacting the opening, a head moving mechanism for moving the part away from the opening, a foundry sand supply mechanism for supplying foundry sand to the space of the head, and the opening of the head. A compressed air supply mechanism that supplies compressed air to the space of the head when the head is in contact with the opening, and a space of the head when the opening of the head is in contact with the opening. And a suction mechanism for sucking the gas, the molding sand supply mechanism has an upper opening that coincides with the lower opening of the hopper in which the molding sand is stored when moved to one position, and the other one. position It consists of a measuring cup with a lower opening that corresponds to the hole leading to the space of the head when it is moved, so that the uncured molding sand can be removed quickly, and in particular a hollow core can be made. At the same time, since a measuring mechanism having a measuring cup is provided between the hopper and the hole, it is possible to supply the molding sand that matches the capacity of the cavity without excess or deficiency, and to efficiently supply the molding sand and the uncured molding sand. Can be discharged. Further, when the cavity is made horizontal, the molding sand can be effectively filled and discharged.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a mold making machine according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram illustrating a moving state of a weighing mechanism portion.

FIG. 3 is an explanatory diagram illustrating a state in which a head is in contact with a mold.

FIG. 4 is an explanatory diagram illustrating a state in which a molding sand is filled in a cavity.

[Explanation of symbols]

1 Mold 1a Upper mold 1b Lower mold 2 Head 2a Abutting piece 2b Opening 2c Space 3 Opening 4, 6, 7, 10b, 11b, 13a, 15 Cylinder 5 Nozzle 8 Hole 9, 15a Compressed air supply pipe 10 Measuring Mechanism 10a Measuring cup 10a 'Upper opening 10a "Lower opening 11 Suction pipe 12 Ejector 13 Discharge pipe 14 Compressed air supply mechanism V1, V2 Valve H Hopper Ha Return sand hopper

Claims (2)

[Claims] 1. A molding sand is blown into a cavity provided in a heated mold to form a hardened layer,
A mold molding machine for manufacturing a hollow core by discharging uncured molding sand, the space having an opening that is hermetically abutted around an opening communicating with the cavity provided in the mold. A head having a portion, a head moving mechanism that moves the opening of the head in a direction of abutting the opening, and a head moving mechanism that moves the opening away from the opening, and a molding sand that supplies molding sand to the space of the head. A supply mechanism, a compressed air supply mechanism that supplies compressed air to the space of the head when the opening of the head is in contact with the opening, and the opening of the head is in contact with the opening. While having a suction mechanism for sucking gas in the space of the head, the foundry sand supply mechanism, the lower opening of the hopper in which the foundry sand is stored when moved to one position and Matching top And has a mouth, mold molding machine, characterized in that it consists of measuring cup having a lower opening that matches the hole leading to the space portion of the head when it is moved to the other position. 2. The mold making machine according to claim 1, wherein the cavity is provided horizontally.