JPS5820351A - Molding method for mold - Google Patents

Abstract

PURPOSE:To make quick drying and hardening of molds added with a water- soluble binder possible by providing a conveying passage for bottom parts between a drying station consisting of a lifting table and a cover member having holes for supplying heated and compressed air and a blowing machine. CONSTITUTION:Compressed air is supplied into a blow head 5 to pack the molding sand in the head 5 into the cavities consisting of a top part 11 and a bottom part 23. In succession, a vertically moving table 3 is moved downward to part the bottom part 23 from the top part 11, and to leave the molding board carriage 18 on a conveying passage 13. Thereafter, the part 23 is lifted together with the carriage 18 and is moved to the position of the drying station right above a table 26, then the table 26 is moved upward to cover the part 23 with a covering member 27 airtightly. Heated and compressed air is supplied from a hot wind generator into the member 27, and the mold 33 on the top surface of the part 23 is dried and hardened. Thereafter, the table 26 is moved downward and the carriage 18 is carried together with the part 23 and the mold 33 to one side of the drying station, where the mold 33 is removed from the part 23.

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. However, in recent years, the problem of disposal of foundry sand,
Due to the rising prices of synthetic resin binders and problems with the generation of foul-smelling and harmful gases in the shell molding method, cold box method, etc., molding methods using water-soluble glue are being reconsidered. , these studies and improvements have been carried out.

Recently, I heated it to 80 to 90 degrees Celsius in an airtight container in advance.
After filling a model box with molding sand containing water-soluble glue in a hopper heated to method, filling a model box with molding sand containing water-soluble glue at room temperature,
A molding method has also been proposed in which heated compressed air is supplied into the model box and passed through the molding sand in the model box to evaporate the moisture in the molding sand and dry and harden the molding sand. However, in the former case, although the curing time is fast, the temperature of the molding sand remaining in the hopper decreases and the moisture evaporates, resulting in poor blowing performance.

The molding sand must be weighed and heated, which is seen as a problem from the viewpoint of workability, etc. In the latter case, in the case of large model shapes and complex model shapes, it may take a long time to dry and harden, or heating may be necessary. There are areas where compressed air cannot pass through,
This was considered a problem due to the formation of ice-hardened spots.

The object of the present invention is to eliminate the drawbacks of the conventional methods and provide 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 (1m) protruding from the top 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 its piston rod (2a). The gate table (
3) A slit cylinder (not shown) was inserted into the lower surface of the upper head part (1M) with a slight gap maintained between the inner periphery, and a blow plate (4) was fixed to the lower surface. A blow head (5) is installed vertically, and the upper end of the blow bed (5) passes through the head part (1a) and projects above the head part (11) to communicate with the sand hopper (6). ing. The sand hopper (6) has a head part (
18) It is attached to the upper surface via an elastic member (7) to prevent the vibration of the vibrator (8) from being transmitted to the column (1). (9) is a slide gate that is slidably provided between the blow head (5) and the sand and hopper (6), and the rear end of the slide gate (9) is attached to the top surface of the head part (11). gate cylinder (1
The blow head (5) is connected to the piston rod (10a) of the blow head (5) by the operation of the gate cylinder (lO).
) and the passage of the sand hopper (7) can be opened and closed. (11) has a concave model part on the lower surface, and a blow hole (not shown in the figure) that communicates with the model part on the first surface.
The blow hole (4) is attached to the lower surface of the blow head (5) by discarding the blow plate (4) so that the blow hole is 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 middle part of the blow machine having the 1ζ configuration as described above, passing through from side to side. The conveyance path (13) is supported by a leg frame (14) erected from the foundation, and has one right end (in FIG. 1) extended to the outside of the mold drying stage, which will be described later. , and is provided at a predetermined interval in the front-rear direction, and is an elevating table; (3)
The width of the interval is such that it can pass through. As shown in FIG. 4, the conveyance path (13) is provided with a hollow chamber (15) inside and a through hole (1
6), and a surface plate truck (18) is movably placed and equipped with an exhaust hole (17) on a side wall surface communicating from the hollow chamber (15) to the outside. On the top,
A seal member (20) having a communication hole (19) is attached so that the communication hole (19) substantially coincides with the through hole (16). A lower mold (hereinafter referred to as lower mold) (23) made of a heat-resistant resin material is provided with a ventilation hole (22) communicating with the recess (21) (21) on the upper surface thereof. The through hole (
16) and the communication hole (19). Additionally, a drying station silan with the following configuration is installed on one side of the blow machine. That is, (24) is a gate-shaped frame, which is fixed, and the table (26) is connected to the conveyance path (
13) so as to be able to pass between them. The table (
Above 26), a cover member (27) whose lower surface has an opening that can surround the lower mold (23) is fixed to the portal frame (24) via a support member (28). . Also,
The conveyance path (13
) is penetrated, and the conveying path (13) is passed through a portal frame (24
) is supported by support legs (29) protruding from the base.

(30) is a hot air generator that has 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 the negative side. 9, which is connected in communication with a compressed air source (not shown).
A heated compressed air exhaust hole (32) is provided on the other side, and the exhaust hole (32) is connected to an inlet hole (27 &
) is connected to communicate with the internal hollow part of the cover member (27). (33) is the mold left on the upper surface of the lower sound (23).

Next, the operation of the structure will be explained.

By operating the lifting cylinder (2), the lifting table (3)
Raise the surface plate cart (18) directly above the lifting table (3)
Lift up and align the lower mold (23) on the upper surface of the surface plate cart (18) with the upper mold (11), and pull it to operate the gate cylinder (10) to open the slide gate (9) and open the sand hopper ( 6) After putting the foundry sand into the blow head (5), reversely operate the gate cylinder (10),
When the slide gate (9) is closed, compressed air is supplied into the blow head (5) to blow the molding sand inside the blow plate (4) and the pull hole (11) of the upper mold (11). (not shown) through the upper mold (11)' and the lower mold (2).
3) Fill the cavity by blowing.

Next, the lifting cylinder (2) is reversely operated to lower the lifting table (3) to release the lower mold (23) from the upper mold (11), and move the surface plate cart (18) to the transport path (13). After leaving it there, the lifting table (3) is lowered to its original position (see Figure 1). After that, the lower mold (23) is moved along the conveyor path (13) together with the surface plate cart (18) to the table (
26) Move the drying stage directly above it to the 1st position and operate the lifting cylinder (25) to lift the table (
26) and lift the surface plate cart (18) until the upper surface of the surface plate cart (18) comes into contact with both lower ends of the cover member (27) via the seal member (20), and the lower mold (2
3) in an airtight manner with the cover member (27), open the on-off valve (not shown), and open the hot air generator (30).
When heated compressed air is supplied into the cover member (27), the mold (33) on the upper surface of the lower mold (23) evaporates moisture and is dried and hardened. On the other hand, heated compressed air passes through the mold (33) to the ventilation hole (22), the recess (21), and the communication hole (1).
9) It is discharged to the outside from the exhaust hole (17) through the through hole (16) and the hollow chamber (15). At this time, the mold (33)
Since the upper half of the sheet is in direct contact with heated compressed air, moisture evaporates easily and it dries and hardens quickly. In this way, the lower mold (2
3) When the mold (33) on the upper surface is dried and hardened, the lifting cylinder (25) is operated in reverse to lower the table (26) and leave the surface plate cart (18) on the conveyance path (13). At the same time, the surface plate cart (18) is moved to the lower mold (23) and the mold (3).
3) along with the transport path (13) to one side of the drying stage cylinder, and after taking out the mold (33) from the lower mold (23), the surface plate cart (18) and the lower mold (23) are moved to the lifting table. (3) Return it directly above and repeat the above operation thereafter.

Incidentally, in the embodiment described above, the surface plate's cart (18) is moved by the worker on the conveyance path (13); however,
It is also possible to use a cylinder to run the vehicle.

Further, in the embodiment, the lifting table (26)
A box-shaped surface plate (18) is placed on the upper surface of the lower mold (2).
3), a lifting table (26) with a connecting hole that connects to the outside from the top surface to the surface.
Place the surface plate (18) directly on the top surface, or if the lower mold (23) is larger than the lifting table (26), provide a communication hole between the lifting table (26) and the lower mold (23). It may also be placed via a plate.

Further, in the above embodiment, the upper mold (11) was fixed to the lower surface of the blow head (5), but the upper mold (11)
) may be left movable up and down on the upper surface of the support member, or the upper die (11) may be moved up and down with a cylinder.

Further, in the embodiment, the upper mold (11) and the lower mold (
23) is made of a heat-resistant resin material, but it goes without saying that a metal material may also be used.

In short, the drying stage consists of a lifting table that can be raised and lowered on one side of the blow machine, an opening on the bottom surface that can surround the lower die, and a power I' space member that has a supply hole for heated compressed air on the wall surface. Since the blowing machine is arranged and a transport path for the lower mold is laid between the drying stage mushroom and the blowing machine, the drying time is short even when the mold is large.
In addition, it has various excellent effects such as being able to dry even a multi-axis shaped mold without uneven drying, 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 where the cover is covered with a member. (3): Elevating table (5) Niblow head (13
): Conveyance path (26): Lifting table (
27) : Cover part (27a) : Supply hole 13
Figure%45A

Claims (1)

[Claims] 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 able to rise and fall, and a pair of lifting tables fixed above and capable of enclosing a lower model on the lower surface. A drying stage consisting of a cover member having a large opening and having a heated compressed air supply hole bored in the wall so as to communicate with the internal hollow chamber, and the drying stage installed between the drying stage run and the blow machine. A mold making device comprising: a conveyance path capable of conveying and moving a lower model.