JPS5973149A - Forming device of casting mold - Google Patents

Abstract

PURPOSE:To enable easy forming of a casting mold with a uniform rate of packing at a low cost by disposing many segments each having a polygonal cross section in tight contact slidingly with each other over the entire region in the opening in the upper part of a molding flask, and moving upward or downward the segments thereby ramming the molding sand in the flask. CONSTITUTION:A pattern 2 and a molding flask 3 are placed on a pattern molding board 1, then molding sand is charged into the flask 3. High pressure oil is charged and discharged into and from the cylinder chamber of each segment 14 to move upward or downward each segment 14 thereby ramming the molding sand 5. The cross section of each segment 14 is formed into a hexagonal shape in this case and the adjacent segments 14 are held in tight contact with each other, whereby the sand 5 in the flask 3 can be rammed tightly. The tight and uniform ramming of the sand 5 is thus made possible with the pattern 2 having large ruggedness as well.

Description

[Detailed description of the invention] The present invention relates to an improvement in a mold making device.

A conventional molding apparatus used for molding mass-produced castings such as automobile parts is configured as shown in FIG. 1 or 2. In these figures, 1 is a model surface plate, 2 is a model, 6 is a formwork, and 5 is foundry sand. In the example of FIG. By applying pressure, the molding sand 5 is hardened to make a mold, and in the example shown in FIG. Foundry sand 5
The mold is made by pounding and hardening it. However, in the case of the example shown in FIG. 1, when molding a mold with large irregularities, the pressing force (squeeze pressure) by the pressure plate 4 is
A phenomenon in which the molding sand is supported by the high part A of the model 2 occurs, and the molding sand 5 is not evenly distributed throughout the molding sand 5, resulting in the drawback that the molding sand 5 in the parts B and C cannot be solidified. Furthermore, as shown in Fig. 2, the pressure plate is divided into a plurality of segments 4',
Each segment 4' is connected to the piston rod 6 of the hydraulic cylinder.
If the construction is such that the molding sand 5 in the mold is pounded and hardened by moving it up and down, each segment 4' is connected to the piston rod B of the hydraulic cylinder, so it will inevitably be large, and each segment 4' will be moved up and down. There is a limit to converting the molding sand 5 into a 7jS type, and there is a drawback that the molding sand 5 cannot be uniformly pressurized. Furthermore, if each divided segment 4' is made smaller, the interval between adjacent segments 4' will be
The molding sand is naturally wide, the pressing force is effective, and the average molding sand is 5.
Similarly to the case using the pressure plate 4 described above, when molding a mold with large irregularities, there is a drawback that the molding sand 5 of part B and 0 cannot be sufficiently pounded and hardened.

Therefore, at present, during molding, a jolt motion or vibration is applied to the model surface plate, mold, and molding sand using a jolt mechanism or a vibration mechanism, and at the same time, pressing force (squeeze pressure) is applied by a pressure plate. ) is also increased to about 10 to 20 ky/d to ensure uniform casting sand filling. However, by adding a Jolt vibration mechanism to the molding equipment and increasing the pressure (squeeze pressure), the entire molding equipment becomes stronger and the foundation of the machine becomes stronger. 4 single-edged, 1,
) There was a drawback that the noise generated by the vibrations and vibrations significantly worsened the working environment.

The present invention solves all the drawbacks of the conventional molding apparatus mentioned in 2. It is possible to uniformly fill the molding sand into the molding frame without giving rise to vibrations, jolts, or vibrations when molding a mold using a model with large irregularities. It was devised for the purpose of providing a molding device capable of forming a mold, in which a large number of segments having a polygonal cross-sectional shape are brought into close contact with each other so that adjacent segments can slide, and the space between the upper part of the formwork 1] The casting sand is arranged over the entire area of the mold, and each segment is raised and lowered using an appropriate lifting means to keep adjacent segments in close contact with each other to pound and harden the molding sand in the formwork. The present invention relates to a characteristic mold manufacturing device.

Hereinafter, the present invention will be explained in detail with reference to the embodiments shown in FIGS. 6 to 5. In FIG. 6, 1 is a model surface plate, 2 is a model with large irregularities, 6 is a mold, and 5 is molding sand charged into the mold 6. The structure, function, and mutual relationship of these members are as follows. , is almost the same as that of the conventional device described above. (Equivalent parts are given the same reference numerals.) Numeral segments 14 have a regular hexagonal cross-sectional shape as shown in FIG.
As shown in FIG. 4, the adjacent segments form a segment group (7, and are arranged over the entire area between the upper parts of the formwork A).

Furthermore, each segment 14 has a cylinder chamber 14σ inside thereof as shown in FIG. It is fixed at 10. 8,
9 is a pressure oil supply provided in the piston rod 16;
The drainage holes 8 and 9 are connected to a pressure oil source (not shown), and pressure oil is supplied to both sides of the piston 16a in the cylinder chamber 14a through these members 8 and 9.
By doing so, each segment 14 is moved downward (raised and lowered) while maintaining the adjacent segments 14 in close contact with each other, and the molding sand 5 in the formwork 6 is pounded and hardened. The oil supply/discharge holes 8.9 and the pressure oil source form means for raising and lowering each segment 14.

One embodiment of the apparatus of the present invention is configured as described above, and when molding a mold using the model 2 with this apparatus, the model 2 and the mold 6 are placed at a predetermined position on the model surface plate 1. After placing the molding sand 5, the molding sand 5 is charged into the mold 6. Then,
Each hydraulic cylinder (not shown) is actuated, and a pressure oil source (not shown) is supplied to the cylinder chamber 14a of each segment 14 through the piston rod discharge holes 8, 9. By supplying and discharging high pressure oil to both sides of the stone 161Z, each segment 14 is raised and lowered to pound and harden the molding sand 5 in the formwork 6. in this case,
The cross-sectional shape of each segment 14 of the device of the present invention is formed into a regular hexagon, and each adjacent segment 14 is held in close contact with each other. can be set significantly smaller than that of . Therefore, the molding sand 5 in the formwork 6 is pounded and hardened by a large number of segments 14 with a small cross-sectional area without any gaps, so even if the model 2 has large irregularities, the molding sand 5 can be pounded and hardened uniformly throughout. This makes it possible to uniformly fill the molding sand 5.

Since the apparatus of the present invention has the above-mentioned configuration and function, the present invention eliminates all of the drawbacks of the conventional apparatus described in F. Even in the case of 7 cases, it is possible to easily mold a mold with a uniform filling degree that is evenly pounded and hardened, thereby improving the dimensional accuracy of the cast product and further reducing the weight of the cast product.

(2) Since no jolt or vibration mechanism is required, equipment costs can be reduced and the working environment can be improved.

The practical effects can be mentioned as follows.

Next, another embodiment of the present invention shown in FIG. 6 shows an example in which the cross-sectional shape of each segment 14' is square,
In addition, other examples not shown in FIG. 7 are examples in which the shape of each segment (14") is an equilateral triangle, but these examples also have the same functions and effects as the above embodiments. It is something that plays.

In yet another embodiment of the present invention shown in FIG. 8, each segment 14'' is engaged with the rod 11 via a screw mechanism, and the lot S11 is attached to the frame of the molding device together with the thrust bearing 12 and motor 16. By the rotation of each motor 16, each segment 14"' is raised and lowered in close contact with the adjacent segment L-14"', and the molding sand in the mold is scooped out. It hardens and produces the same functions and effects as those of the above embodiment.

[Brief explanation of drawings]

FIG. 1 and FIG. 2 are schematic explanatory diagrams of examples of conventional devices, respectively;
6 to 5 are schematic illustrations of an embodiment of the present invention, in which FIG. 6 is a longitudinal sectional view, FIG. 4 is a sectional view taken along the line ■-■ in FIG. 3, and FIG. 5 is a segment view. The vertical sectional view, Figures 6 and 7 are as follows:
4 and 8 are longitudinal sectional views of other embodiments of each segment, respectively. 1: Model surface plate, 2: Model, 6: Formwork, 5: Foundry sand, 8,
9: Oil supply and drain hole, 10: Frame, 11: Rod, 12 Nilast bearing, 16: Motor, 14.14', 14"
i 4///: segment, 16: rod 16a: piston. Sub-Agent Patent Attorney Teru Ito (2 others) Figure 8

Claims (1)

[Claims] A large number of segments having a polygonal cross-sectional shape are disposed over the entire area of the upper opening of the formwork, with adjacent segments slidably in close contact with each other, and each segment is moved by an appropriate lifting means. 1. A mold making device, characterized in that it is configured to raise and lower adjacent segments while keeping them in close contact with each other to pound and harden molding sand in the mold.