JPS649903B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mold making apparatus that rapidly dries and hardens a mold molded using foundry sand to which a water-soluble binder has been added.

Conventionally, after filling a model box with foundry sand to which a water-soluble binder such as water-soluble glue has been added (hereinafter referred to as foundry sand containing water-soluble glue), the model box is placed in a heating furnace or the like to heat the inside of the model box. It was attempted to dry and harden the foundry sand by evaporating the moisture in the foundry sand, but this method was not widely used due to the long drying time and other reasons. However, in recent years, due to problems such as the disposal of foundry sand, the rising price of synthetic resin binders, and the generation of foul-smelling and harmful gases in shell molding, cold boxing, etc. Molding methods have been reconsidered, and research and improvements have been made to them.

And recently, 80-90 in advance in an airtight container.
After filling a model box with molding sand containing water-soluble glue in a hopper heated to ℃, the pressure inside the model box is reduced to evaporate the moisture in the molding sand in the model box, and the molding sand is dried and hardened. After filling a model box with molding sand containing water-soluble glue at room temperature, heated compressed air is supplied into the model box and passed through the molding sand in the model box to remove moisture from the molding sand. A molding method has also been proposed in which the foundry sand is dried and hardened by evaporation, but while the hardening time is fast in the former method, the foundry sand remaining in the hopper may be blown away due to a drop in temperature or the removal of moisture. The molding sand must be measured and heated for each molding, which is seen as a problem from the viewpoint of workability, and in the latter case, in the case of large or complex model shapes, it is difficult to dry and harden the molding sand. Problems have arisen from the viewpoints that it takes a long time, or that there are areas where heated compressed air does not pass through, resulting in uncured areas.

The present invention eliminates the drawbacks of these conventional methods and provides an apparatus for rapidly drying and hardening molds formed using foundry sand to which a water-soluble binder has been added.

The configuration of the present invention will be explained below based on examples.

1 is a column with a head 1a protruding from its upper end;
An elevating cylinder 2 is fixed to the front surface of this lower position, and an elevating table 3 is fixed to the upper end of the piston rod 2a. On the lower surface of the head portion 1a above the lifting table 3, there is a blow head 5 having a slit tube (not shown) fitted therein with a slight gap between it and the inner periphery, and a blow plate 4 fixed to the lower surface. is provided vertically, and the upper end of the blow head 5 is connected to the head portion 1a.
The sand hopper 6 extends through the sand hopper 6 and protrudes above the head portion 1a. The sand hopper 6 is attached to the upper surface of the head portion 1a via an elastic member 7 to prevent vibrations of the vibrator 8 from being transmitted to the column 1. A slide gate 9 is slidably provided between the blow head 5 and the sand hopper 6, and the rear end of the slide gate 9 is connected to a piston rod 10a of a gate cylinder 10 attached to the upper surface of the head portion 1a. The communication passage between the blow head 5 and the sand hopper 7 is opened and closed by the operation of the gate cylinder 10. Reference numeral 11 denotes an upper model (hereinafter referred to as upper mold) made of a heat-resistant resin material, which has a concave model part on the lower surface and a blow hole (not shown) communicating with the model part on the upper surface. Type 1
1 is attached to the lower surface of a blow head 5 via a blow plate 4, with the blow hole aligned with the blow hole of the blow plate 4. A pair of conveyance paths 13 in which the flanged rollers 12 are rotatably supported at approximately equal intervals are provided in the intermediate portion of the blow machine configured as described above, passing through the conveyance paths 13 from side to side. Leg frame 14 erected from the foundation
The mold drying station 3 is supported by the mold drying station, and the right end (in Fig. 1) is extended to the outside of the mold drying station, which will be described later. It is considered to be a width interval. As shown in FIG. 4, the conveyance path 13 is provided with a hollow chamber 15 inside, a through hole 16 communicating with the hollow chamber 15 on the upper surface, and a through hole 16 communicating with the hollow chamber 15 on the side wall surface. A surface plate cart 18 equipped with an exhaust hole 17 is movably placed, and a sealing member 20 having a communication hole 19 formed on the upper surface of the surface plate cart 18 is installed to connect the communication hole 19.
A lower mold made of a heat-resistant resin material is attached to the through hole 16 so as to substantially coincide with the through hole 16, and is further provided with a recess 21 on the lower surface and a ventilation hole 22 on the upper surface communicating with the recess 21. A model (hereinafter referred to as a lower model) 23 is placed with the recess 21 located in the through hole 16 and the communication hole 19 . Furthermore, a drying station consisting of the following structure is installed on one side of the blow machine. That is, 24 is a gate-shaped frame, and at the lower part of this gate-shaped frame 24,
A lifting cylinder 25 is mounted facing upward, and a lifting table 26 is fixed to the upper end of the piston rod 25a, and the table 26 is provided so as to be able to pass between the conveyance paths 13. Above the table 26, a cover member 27, which has an opening on its lower surface that can surround the lower mold 23, covers the supporting member 2.
It is fixed to the gate-shaped frame 24 via 8.
Further, the conveyance path 13 passes through the intermediate portion of the gate-shaped frame 24, and the conveyance path 13 is supported by support legs 29 protruding from the gate-shaped frame 24.

Reference numeral 30 denotes a hot air generator that includes a built-in heating device that can heat compressed air to a predetermined temperature of 60 to 200°C, and the hot air generator 30 has a compressed air supply hole 31 on one side that communicates with a compressed air source (not shown). A heated compressed air discharge hole 32 is provided on the other side.
The discharge hole 32 is connected to the introduction hole 27a in the wall surface of the cover member 27 via a conduit and an on-off valve (not shown) so as to communicate with the internal hollow part of the cover member 27. 33 is a mold left on the upper surface of the lower mold 23.

Next, the operation of the device configured as described above will be explained.

By the operation of the lifting cylinder 2, the lifting table 3
The surface plate cart 18 directly above the lifting table 3 is lifted up, and the lower mold 23 on the upper surface of the surface plate cart 18 is moved to the upper mold 11.
At the same time, the gate cylinder 10 is operated to open the slide gate 9, and the molding sand in the sand hopper 6 is thrown into the blow head 5, and then the gate cylinder 10 is operated in reverse to open the slide gate 9. When it is closed, compressed air is supplied into the blow head 5 to blow the molding sand in the blow head 5 into the cavity consisting of the upper mold 11 and the lower mold 23 through the blow plate 4 and the blow holes (not shown) in the upper mold 11. Includes filling.

Next, the lifting cylinder 2 is reversely operated to lower the lifting table 3 to release the lower die 23 from the upper die 11 and leave the surface plate cart 18 on the conveyance path 13. Descend to the original position (see Figure 1). Thereafter, the lower mold 23 is moved along the conveyor path 13 together with the surface plate cart 18 onto the table 26.
At the same time, the lifting cylinder 25 is operated to raise the table 26, and the surface plate cart 18 is lifted so that the top surface of the surface plate cart 18 touches the lower end surface of the cover member 27 via the seal member 20. The lower mold 23 is airtightly covered by the cover member 27, and then an on-off valve (not shown) is opened to supply heated compressed air from the hot air generator 30 into the cover member 27. The mold 33 on the upper surface of the mold 23 is dried and hardened by evaporating moisture. On the other hand, the heated compressed air
Through the inside, a ventilation hole 22, a recess 21, a communication hole 19,
The gas is discharged to the outside through the through hole 16 and the hollow chamber 15 through the exhaust hole 17. At this time, the upper half of the mold 33 is in direct contact with the heated compressed air, so moisture easily evaporates.
Drys and hardens quickly. In this way, the lower mold 23
When the mold 33 on the upper surface is dried and hardened, the lifting cylinder 25 is reversely operated to lower the table 26 to leave the surface plate cart 18 on the conveyance path 13, and to move the surface plate cart 18 to the lower mold 23 and the mold. 33 on the conveying path 13 to one side of the drying station, and after taking out the mold 33 from the lower mold 23, the surface plate cart 18 and the lower mold 23 are returned to directly above the lifting table 3, and the above operation is repeated thereafter. .

In the embodiment described above, the surface plate cart 18 is moved by the operator on the conveyance path 13, but it may be moved by a cylinder.

Furthermore, in the embodiment described above, the lower die 23 is placed on the upper surface of the lifting table 26 via the box-shaped surface plate 18, but the lifting table is provided with a communication hole extending from the upper surface to the side surface to the outside. The surface plate 18 may be placed directly on the upper surface of the mold 26, or if the lower mold 23 is larger than the lifting table 26, it may be placed between the lifting table 26 and the lower mold 23 through a plate provided with a communication hole. good.

Further, in the above embodiment, the upper die 11 was fixed to the lower surface of the blow head 5, but the upper die 11 may be left on the upper surface of the support member so as to be movable up and down, or the upper die 11 may be moved up and down with a cylinder. It may also be configured to move.

Further, in the above embodiment, the upper mold 11 and the lower mold 23 are made of heat-resistant resin, but it goes without saying that they may be made of a metal material.

In short, on one side of the blow machine, a drying station consisting of a lifting table that can be raised and lowered and a cover member that has an opening on the bottom surface that can surround the lower mold and a supply hole for heated compressed air on the wall surface is placed. Since the structure has a lower mold conveyance path between the drying station and the blow machine, drying time is short even for large molds, and molds with complex shapes can be dried evenly without uneven drying. It has excellent effects and its contribution to this type of industry is extremely significant.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway front view showing an embodiment of the present invention, Fig. 2 is a plan view of Fig. 1, Fig. 3 is a side view of Fig. 1, and Fig. 4 shows a lower mold holding a mold. FIG. 3 is an enlarged sectional view showing a state covered with a cover member. 3: Elevating table, 5: Blow head, 13:
Conveyance path, 26: Lifting table, 27: Cover member, 27a: Supply hole.

Claims (1)

[Claims] 1. A blow machine with a blow head fixed above an elevating table, a lifting table provided on one side of the blow machine so as to be movable up and down, and a pair of lifting tables fixed above and capable of enclosing a lower model on the underside. A drying station consisting of a cover member having an opening and having a heated compressed air supply hole bored in the wall to communicate with the internal hollow chamber, and a lower mold installed between the drying station and the blow machine. A mold making device comprising: a movable conveyance path for conveying;