JPH0534104B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method and apparatus suitable for embedding a fugitive model in silica sand in a full mold method.

(Prior art and problems) Generally, in the full mold method, a fugitive model (hereinafter referred to as the model) made of foamed synthetic resin such as foamed polystyrene is buried in silica sand. When the shape of the mold is complicated, it is very difficult to move the silica sand to every corner of the model, and there are problems such as cavities are created between the model and the silica sand, leading to defective castings.

(Objective of the Invention) The present invention has been made to solve the above-mentioned problems, and it is possible to bury a model in silica sand using the full mold method, which allows the model to be buried in silica sand without creating a cavity between the model and the silica sand. An object of the present invention is to provide a method and an apparatus thereof.

(Means for Solving the Problems) The present invention is a method for burying a fugitive model in the full mold method, in which a fugitive model can be detachably attached to the inside of a container made of a plate material provided with small holes through which silica sand can pass. After it is fixed, the container is placed in a mold box and silica sand is added thereto, and then the container and the fugitive model are integrally rotated at a low speed and tilted while applying vibration to the silica sand. After returning the container to its original position, the application of vibration to the silica sand and the rotation and tilting of the container are stopped, and then the attachment of the container to the fugitive model is released, leaving only the fugitive model and placing only the container into the mold. It is characterized by being removed from the box.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings. A vibrating table 2 is installed on the base 1 while being elastically supported via air springs 3, and the vibrating table 2 has a flange-equipped roller conveyor 5 attached to the top surface that can move the mold box 4. , and oscillation means 6, 6 are attached to the lower surface. Note that the bottom of the mold box 4 has a structure that allows ventilation.

Further, on both left and right outer sides of the vibration table 2, upwardly directed cylinders 7, 7 are elastically supported via coil springs 8, 8 for vibration absorption, and a fixed frame 9,
An arc-shaped guide rail 10 is installed between the upper ends of the piston rods 7a, 7a of the cylinders 7, 7. The guide rail 10
A traveling truck 12 is mounted on the vehicle and is driven by a reduction gear motor 11, and a vertical rotating shaft 13 extending downward is rotatably provided on the traveling truck 12. The upper part of the vertical rotation shaft 13 is connected to the output shaft of a motor 16 with a reduction gear via a pair of bevel gears 14 and 15, and the motor 16 with a reduction gear is connected to the traveling carriage 12 via a support stand 17. It is permanently installed.
Further, a box-shaped container 18 is provided at the lower end of the vertical rotation shaft 13.
The container 18 is turned upside down and fixed with the bottom facing up, and the container 18 is made of a plate material with a number of small holes (not shown) through which silica sand can pass. A suction means 19 for adsorbing the model M is provided at the inner bottom of the container 18.
is provided. Further, a clamp mechanism 20 for fixing the mold box 4 is attached to the flanged roller conveyor 5. 21 is Sandhoppa.

(Operation of the invention) Next, the operation of the apparatus configured as described above will be explained. As shown in FIG. 1, after carrying the empty mold box 4 onto the collared roller conveyor 5, the mold box 4
is fixed by the clamp mechanism 20, and a predetermined model M is sucked by the suction means 19 at the sprue, and then the model M is set in the container 18. Next, the cylinders 7, 7 are contracted to lower the guide rail 10, the traveling carriage 12, etc., and the container 18 and the model M are charged into the molding box 4. Subsequently, the silica sand S in the sand hopper 21 is transferred to the molding box. 4, and the model M and container 18 are buried in the silica sand S. Next, the oscillating means 6, 6 are driven to vibrate the vibration table 3, mold box 4, etc.
While imparting vibration to the silica sand S inside, the motor 16 with a reducer is driven to rotate the container 18, and the motor 10 with a reducer is driven to move the traveling cart 12 downward along the guide rail 10. , the container 18 and the like are tilted as shown in FIG. Then,
As the container 18 rotates and tilts, the model M and the silica sand S in the container 8 are rotated and tilted, and as a result, the silica sand S in the container 8 moves to every corner of the model M. Fill the cavity between and silica sand S. Incidentally, the silica sand S in the mold box 4 flows into the container 8 through the small holes as appropriate. Next, the oscillation means 6, 6
After weakening the output to prevent movement of the silica sand S in the container 18, the motor 10 with a speed reducer is reversed to return the traveling cart 12 to the center of the guide rail 10, thereby moving the container 18 in the vertical direction. Then, the drive of the motor 10 with a speed reducer is stopped to stop the rotation of the container 18.

Next, after releasing the suction state of the model M by the suction means 19, the cylinders 7, 7 are extended and the traveling carriage 12 etc. are raised, and the container 18 is filled with silica sand S.
Then, the driving of the oscillating means 6, 6 is stopped. In this way, a desired mold for the full mold method is obtained in which the model M is filled with the silica sand S to every corner, and no cavity is formed between the model M and the silica sand S. After that, the clamp mechanisms 20, 20
After releasing the mold box 4, the mold box 4 is moved from the flange roller conveyor 5 to the suction box (not shown) of the pouring station, and then the upper end opening of the mold box 4 is closed with a resin film, and the suction box 4 is Molten metal is injected into the molding box 4 while vacuuming the pressure through the box, and after the molten metal solidifies, the silica sand S and the casting material are discharged from the molding box 4.

In the above embodiment, the container 18 is charged into the mold box 4 before the silica sand S is charged, but it may be charged after the silica sand S is charged. In this case,
It is necessary to fluidize the silica sand S by supplying compressed air from the bottom of the molding box 4 or applying vibration to reduce the resistance of the silica sand S to the model M. Further, when using a small mold box 4, the flange roller conveyor 5 may be removed and the mold box 4 may be placed directly on the vibrating table 2 by hand or the like.
Further, in the embodiment described above, the model M is suctioned by the suction means 19, but the model M may be fixed by being pierced by a fork-shaped attachment means.

(Effects of the Invention) As is clear from the above description, the present invention provides a container made of a plate material in which a model is removably attached and is provided with a large number of small holes through which silica sand can pass, and is placed upside down in a molding box. After charging the silica sand, the model and silica sand are rotated and tilted through the container while applying vibration to the silica sand to move the silica sand to every corner of the model, and then the container is taken out leaving the model behind. Since the model is buried in the silica sand, there is an excellent effect that the model can be reliably and easily buried in the silica sand without creating a cavity between the model and the silica sand.

[Brief explanation of the drawing]

FIGS. 1 and 2 are partially sectional front views showing an explanation of the operation in one embodiment of the present invention. 2: Vibration table, 10: Guide rail, 1
2: Trolley, 13: Vertical rotation axis, 18: Container, 19:
Adsorption means.

Claims (1)

[Scope of Claims] 1. After a fugitive model is removably attached to the inside of a container made of a plate material provided with small holes through which silica sand can pass, the container is placed upside down in a molding box and silica sand is poured into the container. Next, the container and the evanescent model are rotated and tilted together at low speed while applying vibration to the silica sand, and after returning the container to its original position, applying vibration to the silica sand and The fugitive model in the full mold method is characterized by stopping the rotation and tilting of the container, then releasing the attachment of the container from the fugitive model, and extracting only the container from the molding box, leaving the fugitive model behind. Burying method. 2. An arc-shaped guide rail 10 is disposed above the elastically supported vibration table 2 so as to be movable up and down, and a traveling trolley 12 is mounted on the guide rail 10 so as to be movable, and the traveling trolley 12 is provided with a vertical rotation mechanism extending downward. Axis 13
A container 18 made of a plate material with a small hole through which silica sand can pass is fixed to the bottom end of the vertical rotation shaft 13, and a fugitive model can be attached to and removed from the container 18. Freely attached mounting means 1
9. A device for embedding a fugitive model in a full mold method, characterized by being provided with a.