JP2729495B2 - Casting method for plaster mold formation - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a casting method for forming a gypsum mold, which is used when molding a gypsum mold.

(Prior art)

Castings may be cast with gypsum molds. By the way, when filling the kneaded gypsum P into the product molding model 6 in molding the gypsum mold, conventionally, as shown in FIG. 4, the product molding model 6 is set in the mold frame 8. At the same time, a guide rod 71 for casting is erected at a position away from the product molding model 6, and the kneaded gypsum P is transferred to the guide rod 71.
To fill the mold 8.

[Problem to be solved by the invention]

However, since the guide rod 71 is erected in the mold 8 at a position away from the product forming model 6, the kneaded gypsum P is moved from one direction of the lower surface.
As a result, a turbulent flow occurs around the product forming model 6, and therefore, there is a disadvantage that air bubbles are likely to be contained on the inner surface of the formed gypsum mold.

 An object of the present invention is to solve the above-mentioned disadvantages.

[Means for solving the problem]

In order to achieve the above object, in the casting method for forming a gypsum mold according to the present invention, a product forming model 6 is arranged in a mold 8 and guided to the product forming model 6 via a guide member. The kneaded gypsum P is filled in the mold 8 by transmitting the kneaded gypsum P to the top surface of the member. In addition, a guide member may be brought into contact with the product forming model 6 to transmit the kneaded gypsum P to the product forming model 6 via the guide member.

[Function of the invention]

Since the casting method for forming a gypsum mold according to the present invention is configured as described above, turbulence of the mixed gypsum is less likely to occur around the product forming model.

[Explanation of Example]

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

1 and 2, reference numeral 1 denotes a support plate having a through hole 11 at the center. Reference numeral 2 denotes a rotating disk, which has a rotating shaft 21 protruding from the center of the lower surface. The rotating shaft portion 21 of the rotating disk 2 is connected to a through hole 11 of the supporting disk 1 through a bearing 3.
It is inserted in. Therefore, the rotating disk 2 is rotatable with respect to the support disk 1. Reference numeral 4 denotes an auxiliary disk, which is mounted on the rotating disk 2. This auxiliary disk 4 is piece 4
Since it is hung on the rotating disk 2 by 1, 41, 41, it rotates integrally with the rotating disk 2. Reference numeral 5 denotes a base disk, which is mounted on the auxiliary disk 4 and fixed by screws 51. For this reason, the base disk 5 rotates integrally with the auxiliary disk 4 and, consequently, the rotary disk 2. 52 is a parallel pin, which is inserted between the auxiliary disk 4 and the base disk 5.
The parallel pins 52 prevent the auxiliary disk 4 and the base disk 5 from rotating with each other.

Next, reference numeral 6 denotes a model for forming an impeller made of silicone rubber.
It corresponds to a model having a complicated shape with irregularities, and is attached to the base disk 5. This impeller forming model 6 is a spiral wing 6
, And the centers of the spiral blades 61, 61, ... coincide with the rotation center of the rotating disk 2. Reference numeral 62 denotes a locking projection, which is integrally formed on the upper end of the impeller forming model 6. Numeral 7 denotes a pusher model made of silicone rubber, which is arranged above the impeller forming model 6. The feeder model 7 corresponds to the “guide member” of the present invention, and has a locking hole 72 on the lower end surface. The impeller forming model 6 corresponds to the “product forming model” of the present invention. By inserting the locking projection 62 of the impeller forming model 6 into the hole 72,
The feeder model 7 is connected to the impeller forming model 6. Reference numeral 8 denotes a formwork, which is mounted on the base disk 5.
The form frame 8 surrounds the impeller forming model 6 via a predetermined space S.

In order to form a gypsum mold in the gypsum mold forming apparatus configured as described above, first, the space S is filled with kneaded gypsum (a mixture obtained by stirring and mixing powdered gypsum, a foaming agent, and water). When filling the kneaded gypsum P, the kneaded gypsum P is poured into a substantially central portion of the top surface of the feeder model 7.
Then, since this top surface has a spherical convex shape, the kneading gypsum flows down the top surface in a radial manner, and travels along the side surface of the pusher model 7 and, consequently, the surface of the impeller forming model 6, and has a substantially laminar flow state. Is filled in the space S in the mold 8 without containing air bubbles. The top surface of the pusher model 7 does not necessarily have to be spherically convex. After the kneaded gypsum P is solidified, the pusher model 7 is pulled upward (in FIG. 1) and removed from the impeller forming model 6. afterwards,
The mold 8 is moved upward (in FIG. 1), and the mold 8 and the gypsum mold 9 are separated from the base disk 5. At this time, the rotating disk 2, the auxiliary disk 4, and the base disk 5 are integrated with the support disk 1 even though the spiral blades 61, 61,. Since it is rotatable, the impeller forming model 6 is
Rotates together with the rotating disk 2 and the like, and as a result, the gypsum mold 9 can be smoothly released from the impeller model 6.

Finally, the mold 8 is gripped, the plaster mold 9 is extruded, and the plaster 9 is removed from the mold 8.

Reference numeral 22 denotes an air hole, which is formed in the rotating disk 2. The tip of the air hole 22 is open to a gap between the support disk 1 and the rotating disk 2. By blowing compressed air into the air holes 22 from the outside, the kneaded gypsum that has entered the gap between the support disk 1 and the rotating disk 2 (because the rotating disk 2 cannot rotate when the mixed gypsum dries) is blown off. Can be.

FIG. 3 shows another embodiment for forming a gypsum mold for forming a floating seal. In this embodiment, reference numeral 71 denotes a guide member, which stands on the base disk 5. The guide member 71 forms a gate model and is in contact with the outside of the floating seal forming model 6. Therefore, when the mixed gypsum P is filled, the mixed gypsum is poured onto the top surface of the guide member 71 so that the mixed gypsum is not filled.
It flows down to the side surface, flows down the surface of the floating seal forming model 6, and fills the space S in the mold 8 in a substantially laminar flow state without containing bubbles.

In addition, in this casting method, when pouring the kneaded gypsum, it does not prevent the product model from being poured into any other portion (a portion other than the above-described embodiment).

〔The invention's effect〕

The casting method for forming a gypsum mold according to the present invention includes disposing a model for product formation in a mold, and transmitting the kneaded gypsum to the top surface of the guide member via the guide member to the model for product formation. Is characterized by filling the kneaded gypsum P into the mold, whereby turbulent flow of the kneaded gypsum hardly occurs around the product forming model.

Therefore, if a gypsum mold is formed using this gypsum mold forming casting method, a gypsum mold with less contained bubbles can be easily obtained.

[Brief description of the drawings]

1 to 3 show an embodiment of a casting method for forming a gypsum mold according to the present invention, wherein FIG. 1 is a sectional view, FIG. 2 is a view taken in the direction of arrow II in FIG. The figure is a partial sectional view of another embodiment. FIG. 4 is a sectional view of a conventional example. 6 ... impeller molding model (product forming model) 7 ... hot-water bath model (guide member) 8 ... mold P ... kneading gypsum 71 ... guide member

Claims (1)

(57) [Claims] 1. A product forming model (6) is arranged in a mold (8), and the product forming model (6) is guided by the guide members (7, 71) via guide members (7, 71). Casting the mixed gypsum (P) into the mold (8) by transmitting the mixed gypsum (P) to the top surface of the mold.