JPH07108433B2 - Method and apparatus for embedding disappearance model in full mold method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method and an apparatus suitable for embedding a fugitive model in silica sand in a full molding method.

(Prior art and problems) Generally, in the full-molding method, an extinguishing model (hereinafter abbreviated as a model) made of a foamed synthetic resin such as expanded polystyrene is embedded in silica sand. When the shape is complicated, it is very difficult to move the silica sand to every corner of the model, and there is a problem that a cavity is formed between the model and the silica sand to induce defective casting.

(Object of the Invention) The present invention has been made to solve the above problems,
An object of the present invention is to provide a model burying method and apparatus in a full molding method that can bury a model in silica sand without forming a cavity between the model and silica sand even when the model has a complicated shape.

(Means for Solving Problems) The present invention relates to a method of embedding a fugitive model in a full-molding method, in which the fugitive model is placed in a mold box and silica sand is charged to put the fugitive model in silica sand. Then, the upper end opening of the mold box is closed by a pressing member, and subsequently, while applying vibration to the silica sand and the disappearing model, the silica sand is pressed through the pressing member and the cast silica box is used. The characteristic feature is that the sand and the vanishing model are rotated 360 degrees or 180 degrees in the vertical plane in the vertical plane so that the vanishing model is filled with the silica sand in every corner.

(Example) Hereinafter, the Example of this invention is described in detail based on drawing.

On the base (1), the vibration table (2) is the air spring (3).
The vibration table (2) is elastically supported via (3), and the vibrating table (2) has a flanged roller conveyor (4) for loading and unloading a mold box (19), which will be described later, and an oscillating means ( 5) and (5), and upward cylinders (6) and (6) are attached to both left and right side surfaces. Then, the upper ends of the piston rods of the cylinders (6) and (6) are fixed to the cylinders (7) and (7) with brackets (8) and (9) facing inward and having the same center line. Clamping claws (10) (10) having a U-shaped vertical section are fixed to the tip ends of the piston rods of the cylinders (7) (7). Further, on the bracket (9), there is provided a rotating means (11) which is connected to the clamp claw (10) and rotates the clamp claw (10) and the piston rod of the cylinder (7) forward and backward by 180 degrees in a vertical plane. is set up. Further, plate-like support bases (13) (13) are attached to the clamp claws (10) (10), respectively, and the support bases (13) (13) are mounted in a mold box (19) described later. A pressing member (14) having a loosely insertable protrusion (14a) on its lower surface is placed via air springs (15) (15), and the pressing member (14) is placed on the support bases (13) (13). 1
Air spring type pressing means (16) (16) for pressing 4) downward
Are respectively mounted via the support members (17) (17), and the air springs (15) (15) and the pressing means (16) (16) can slide in the left-right direction with respect to the pressing member (14). Is configured. The pressing means (16) (16) are configured to expand and contract in the vertical direction by supplying and discharging compressed air. (1
9) is a mold box having a bottom ventable structure, and protrusions (19a) (19a) that can engage with the clamp claws (10) (10) are integrally formed on both left and right outer side surfaces of the mold box. Has been formed.

(20) is a roller conveyor with a collar, and (21) is a sand hopper.

Next, the operation of the apparatus thus configured will be described.
After inserting an appropriate amount of silica sand (S) from the sand hopper (21) into the mold box (19) on the roller conveyor with a collar (20), the disappearance model (M) is set on the silica sand (S) and the silica sand is also set. (S) is put into the mold box (19) again and the model (M)
Is buried in silica sand (S), and then the mold box (19) is transferred onto the roller conveyor (4) with a collar on the vibrating table (2). Next, the cylinders (7) (7) are extended to engage the clamp claws (10) (10) with the protrusions (19a) (19a) of the mold box (19) to clamp the mold box (19),
Subsequently, the oscillating means (5) (5) are driven to vibrate the vibration table (2), the mold box (19), etc., and thereby the mold box (19).
Vibration is applied to the silica sand (S), model (M), etc. inside. Next, pressing means (16) with vibration applied to silica sand (S), etc.
Compressed air is supplied to (16) to lower the pressing member (14) against the air springs (15) and (15), and the projection (14a) of the pressing member (14) causes the inside of the mold box (19). The silica sand (S) is pressed downward, and the cylinders (6) and (6) are extended to raise the cylinders (7) and (7), the mold box (19), the pressing means (16) and (16), etc. After that, the rotating means (11) is driven to rotate the mold box (19), the pressing member (14) and the like 180 degrees forward and backward at a low speed in the vertical plane (see FIG. 2). Then, the silica sand (S) is gradually moved by vibration, and is pressed by the pressing member (14) so as not to form a cavity between the model (M) and the silica sand (S), and further moved by rotation. The direction is changed, and as a result,
The silica sand (S) will be filled into the model (M) in every corner. Thus, the model (M) and silica sand (S)
The desired mold for full molding is obtained with no cavities between and. Then, the cylinders (6) and (6) are contracted to lower the mold box (19), the cylinders (7) and (7), and the mold box (19) is mounted on the collared roller conveyor (4) again.
The driving of the oscillating means (5) (5) is stopped, and the pressing means (16)
Compressed air is discharged from (16), the protrusion (14a) of the pressing member (14) is pulled out from the mold box (19), and the cylinders (7) and (7) are contracted to clamp the mold box (19). Solve Then, the mold box (19) is pushed out from the roller conveyor with flange (4) onto the roller conveyor with flange (20) and moved onto the suction box (not shown) of the pouring station, and the upper end of the sprue of the model (M). After removing the silica sand (S) from the part to make it possible to pour the molten metal, the upper end opening of the mold box (19) is closed with a resin film, and the inside of the mold box (19) is sucked and decompressed through the suction box. After pouring and solidifying the molten metal, silica sand (S) and the casting material are discharged from the mold box (19).

In the above embodiment, the mold box (19) is carried in and out of the vibrating table (2) through the roller conveyor (4) with a collar, but when a small mold box (19) is used. Alternatively, the roller conveyor (4) with a collar may be removed and the mold box (19) may be directly carried in and out on the vibrating table (2) by manual work or the like. Also, in the above example,
The clamp claws (10) (10) for clamping the mold box (19) are provided to be movable up and down, and when the mold box (19) is rotated, the clamp claws (10) (10) are used to raise the mold box (19). However, when the clamp claws (10) (10) are arranged at a predetermined height and an elevating table for elevating the mold box (19) is provided, the mold box (19) is rotated when the mold box (19) is rotated. After raising the box (19) to the height of the clamp claws (10) (10) on the lifting table, it is clamped by the clamp claws (10) (10), and then when the mold box (19) rotates, The lifting table may be lowered so as not to interfere.

Furthermore, although the mold box (19) is rotated 180 degrees forward and backward in the above embodiment, it may be rotated 360 degrees.

(Effects of the Invention) As is apparent from the above description, the present invention provides a mold box (1
9) Insert the silica sand (S) and the model (M) into the inside and bury the model (M) in the silica sand (S), and then add the silica sand (S)
And pressing member (14) while applying vibration to the model (M)
The silica sand (S) is pressed through the mold box (19) and the silica sand (S) and the model (M) are rotated through 360 degrees or 180 degrees in the vertical plane in the vertical plane. Even if the shape of M) is complicated, silica sand (S) is filled in every corner of the model (M) so that there is no space between the model (M) and silica sand (S). Therefore, it has an excellent effect of preventing the generation of defective castings.

[Brief description of drawings]

The drawings show an embodiment of the present invention, and FIGS. 1 and 2 are partial sectional front views showing the operating state, and FIG. 3 is a right side view of FIG. (2): Vibration table (10): Clamp claw (14): Pressing member (19): Mold box

Claims (2)

[Claims] 1. A disintegrating model is placed in a mold box and silica sand is charged to bury the disintegrating model in silica sand, and then the upper end opening of the mold box is closed by a pressing member. While applying vibration to the silica sand and the disappearing model, press the silica sand through a pressing member and rotate the silica sand and the disappearing model 360 degrees in a vertical plane or 180 degrees forward and reverse through a cast silica box. Therefore, a method of embedding a disappearing model in a full molding method, characterized in that the disappearing model is filled with silica sand in every corner. 2. A vibrating table (2) provided so as to vibrate,
Clamp claw (1) that clamps the mold box for full molding method (19) and rotates 360 degrees in the vertical plane or 180 degrees forward and reverse.
0) (10) is mounted so that it can be moved up and down, and the upper end opening of the mold box (19) is closed between the clamp claws (10) and (10), and silica sand in the mold box (19) is closed. A disappearing model embedding device in a full molding method, characterized in that a pressing member (14) for pressing is installed via pressing means (16) (16).