JPH04105751A - Casting apparatus - Google Patents

Abstract

PURPOSE:To contrive the mass-production of castings by top-pouring a molten metal into plural molds disposed in a sucked chamber and casting it. CONSTITUTION:A carriage 2 arranging plural molds is housed into the chamber and by ascending lifting cylinders 3a, 3b, the molds 5 are engaged with the chamber main body 8 and the carriage is engaged with the main body 8. Successively, stoppers 11 are lowered and inserted into the molds 5 to hermetically close the chamber and cavities in the molds. Thereafter, molten metal is filled up into pouring basin 5a in the molds, and after reducing the pressure in the chamber, the stoppers are ascended and the molten metal is top-poured to fill up the cavities. By this method, plural castings can be available at the same time.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to an improvement in a casting apparatus, and more specifically, a method for casting molten metal by pouring it over a number of molds arranged in a reduced pressure chamber. This invention relates to a casting device that mass-produces castings.

(Prior Art) As a casting device that performs casting using a pressure difference from atmospheric pressure, there is a suction casting device as shown in Japanese Utility Model Publication No. 2-16848. This device houses a mold in a chamber,
A mold stalk (gate) protrudes from the bottom of the chamber, and a depressurizing port is provided on the top of the chamber.

(Problem to be Solved by the Invention) In a conventional suction casting device, when the pressure inside the chamber is reduced through the boat, the pressure inside the cavity is reduced through the mold, and as a result, the pressure inside the cavity is reduced through the mold's stalk (gate). The molten metal is sucked in and solidified in the cavity while maintaining its reduced pressure state, making it possible to cast products without casting defects such as poor circulation or slag entrainment, but the casting time is long. There is a problem.

In addition, in the suction casting method using the casting equipment, the mold is transported to the upper part of the melting furnace, the mold is lowered until the stalk (gate part) of the mold is immersed in the molten metal, and then the suction casting equipment mold is raised. , it is necessary to transport the mold to the post-processing position, and at this time, green sand molds, shell sand molds, ceramic shell molds, plaster molds, etc. commonly used as molds have low strength, so if the mold is moved in a complicated manner as described above, the mold may be damaged. may be damaged. Moreover, since mechanical strain occurs in the mold, there is a natural limit to shortening the casting cycle time, that is, shortening the transportation time other than the casting time.

Furthermore, in the casting equipment, it is necessary to create the negative pressure necessary to suck up the molten metal into the cavity of the mold, and the stress generated by the pressure difference between the inside and outside of the mold causes the mold to levitate, causing damage to the mold. However, there is a problem in that a gap is created between the mold's stalk (gate) and the chamber, making it impossible to suction and inject the molten metal into the cavity. Therefore, insulating materials such as ceramic fibers are used in the mold stalk (gate area).
However, a new problem arises in that productivity is extremely low.

The present invention has been made to solve these various problems, and provides a casting device with good productivity that utilizes the pressure difference from atmospheric pressure.

(Means for Solving the Problems) The casting apparatus of the present invention includes a chamber comprising a movable chamber body and a surface plate having a guide pin and a seal member, and a clamp that restrains and holds a large number of molds arranged in parallel in the horizontal direction. a dolly having a guide hole into which a means and a guide pin are inserted and which can be accommodated in the chamber; an elevating cylinder disposed above the chamber for vertically moving the dolly and the mold placed on a surface plate of the chamber; It is equipped with a stopper that can be raised and lowered.

(Function) After a cart equipped with a large number of molds arranged in parallel in the horizontal direction is accommodated in a chamber, when the lifting cylinder rises, the molds engage with the chamber body via the sealing member, and the cart also engages with the guide pin and the guide. The stopper 9, which is locked to the chamber body through the hole, is then lowered and inserted into the mold through the sump of the mold, thereby sealing the chamber and the cavity of the mold. After that, after filling the mold reservoir with molten metal and reducing the pressure in the chamber, when the stopper is raised,
Molten metal is poured into the cavity of the mold at a high flow rate, filling the cavity with molten metal.

(Embodiment) An embodiment of the present invention is shown in the drawings, and on the upper surface of the surface plate 1 there are a first lifting cylinder 3a for lifting and lowering the cart 2 that has been carried in, and a second lifting cylinder 3b for lifting the cart 2 to be loaded. The second lifting cylinder 3b is provided with a roller 4b for carrying out the cart 2, and above the surface plate 1 is provided a roller 4a for carrying the cart 2 in. A third lifting cylinder 3c is attached to the lower surface.

The truck 2 is provided with a clamping means 6 for restraining and holding a large number of molds 5 arranged in parallel in the horizontal direction, and the clamping means 6 consists of a fixed frame 6a erected on both sides of the truck 2 and an operating cylinder 6.
b, and a movable frame 6c that can move forward and backward, and a first guide hole 7 is bored in the upper surface of the fixed frame 6C.

During casting, a large number of molds 5 made of shell sand, gas-set sand, and self-hardening sand are arranged horizontally between the fixed frame 6a on one side and the movable frame 6c on the trolley 2, and the upper surface of the molds 5 is filled with hot water. A reservoir 5a is formed, and a cavity 5b is formed inside the reservoir 5a.

A chamber body 8 having a lower opening and an upper opening is disposed above the surface plate 1, and a second guide hole 8a is bored near the upper opening on the upper surface of the upper plate of the chamber body 8. A fourth lifting cylinder 3d is attached to the four corners, and a first guide hole 7 of the fixed frame 6a is attached to the lower surface of the upper plate.
A first guide pin 8b that is inserted into the mold and a first seal member 8c that engages with the mold are provided, and a second seal member 8d that engages with the surface plate 1 is provided on the lower surface of the side plate of the chamber body 8. The chamber body 8 is moved by the lifting cylinder 3d.
is movable up and down, and when the chamber body 8 and the surface plate 1 are engaged, a chamber is formed.

The chamber body 8 is connected to a vacuum pump (not shown) through a port 9 and a valve (not shown), and the operation of the pump can exhaust the air inside the chamber to the outside to reduce the pressure inside the chamber. It looks like this.

Furthermore, a rectangular parallelepiped frame frame 10 that is vertically movable is disposed above the chamber main body 8, and a fifth
A lifting cylinder 3e is attached, and the lower frame of the frame body 10 is provided with a second guide pin 10a to be inserted into the second guide hole 8a, and a through hole 1 through which a rod-shaped stopper 11 is inserted.
2 is bored, and a stopper 11 is loosely fitted to the lower frame through a through hole 12. The fifth elevating cylinder 3e may be fixed to a built rail, or may be attached to a self-propelled movable base. The movable platform is a type of trolley that can be self-propelled by an appropriate drive mechanism, and is placed on a pair of rails installed horizontally and parallelly via wheels, and can reciprocate in the horizontal direction. can.

Next, the casting action will be explained.

After the clamping means 6 restrains and holds a large number of horizontally arranged molds 5, the carriage 2 is moved to a predetermined position above the surface plate 1 and the fourth lifting cylinder 3d is lowered, the chamber body 8 is lowered, and the second The chamber body 8 engages with the surface plate 1 via the seal member 8d to form a chamber. Next, when the first lifting cylinder 3a rises, the first guide pin 8b
is inserted into the first guide hole 7 of the fixed frame 6a and the trolley 2
is locked to the chamber body 8, and the mold 5 is engaged with the chamber body 8 via the first seal member 8c. Thereafter, when the fifth elevating cylinder 3e descends, the frame 10 and the stopper 11 descend together, and the second guide pin 10
a is inserted into the second guide hole 8a, the frame 10 is locked to the chamber body 8, and the stopper 11 is fitted to the mold 5, after which the frame 10 is held at the rest position. After pouring molten metal into the mold 5 into the pool 5a, when the pressure inside the chamber is reduced through the port 9, the pressure inside the cavity 5b is reduced through the mold 5. Next, when the fifth lifting cylinder 3e rises, the stopper 11 is pulled out from the mold 5, and the molten metal is simultaneously sucked and injected into each cavity 5b at a high flow rate, filling the cavities 5b with the molten metal. As the frame body 10 and the stopper 11 rise, they rise together and are then held at a predetermined position.

Thereafter, when the first elevating cylinder 3a descends and the fourth elevating cylinder 3d rises, the cart 2 comes into contact with the roller 4a and the reduced pressure in the chamber is released. Next, the second elevating cylinder 3b is raised to place the cart 2 on the roller 4b, and then the cart 2 is pushed out in a direction perpendicular to the plane of the paper by a pusher (not shown). Thereafter, the restraint of the mold 5 by the clamp means 6 is released, and the cast mold 5 is taken out and demolded to obtain a casting.

(Effects of the Invention) According to the present invention, a large number of castings can be cast simultaneously.
Productivity is greatly improved. Furthermore, since the molten metal injection speed is fast and the molten metal flows well, thin-walled castings can be easily cast.

[Brief explanation of drawings]

The drawing is a sectional view of a casting apparatus according to the present invention. DESCRIPTION OF SYMBOLS 1... Surface plate, 2... Dolly, 3a... 1st elevating cylinder, 3b... 2nd elevating cylinder, 5... Mold, 6
... Clamping means, 7... First guide hole, 8...
Chamber body, 8b...first guide pin, 8c...
First seal member, 8d...Second seal member, 11...
・Stopper.

Claims (1)

[Claims] A chamber consisting of a vertically movable chamber body and a surface plate having a guide pin and a seal member, a clamp means for restraining and holding a large number of horizontally arranged molds, and a guide hole into which the guide pin is inserted. A casting device comprising: a accommodating cart; an elevating cylinder for vertically moving the cart and mold placed on a surface plate of a chamber; and a stopper disposed above the chamber that can be moved up and down.