JPS6321577B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for molding a mold by squeezing molding sand in a flask.

Conventionally, when molding a mold for a product cavity with a complex shape, the molding sand in the flask was first sanded and then squeezed, but as a result of sanding, vibration and noise pollution were generated. Moreover, the molding machines have to be made extremely sturdy to withstand the stress, making them larger and the foundations on which they are installed also becoming larger. For this reason, a so-called segment squeeze method in which the squeeze plate is divided into many pieces, suspended by multiple cylinders, and lowered along the surface of the model plate during squeezing has been adopted in some cases. However, this method has drawbacks such as the fact that the divided squeeze plate cannot be lowered sufficiently along the surface of the model plate, and it is difficult to obtain a mold with the desired hardness and molding condition. Ta.

The present invention has been made to solve the above-mentioned drawbacks, and one embodiment of the present invention will be described in detail below with reference to the drawings. Reference numeral 1 denotes a base set on a foundation. A squeeze cylinder 2 facing upward is fixed on the base 1, and a squeeze table 3 is fixed to the tip of the piston rod of the cylinder 2. A model plate 5 having a predetermined model part 4 is placed on the squeeze table 3, and a casting flask 7 with a filling frame 6 placed on its upper surface is mounted on the model plate 5. Further, a gate-shaped frame 8 having a required height is fixedly installed on the base 1, and a squeeze head mechanism 9 is installed on the ceiling of the gate-shaped frame 8 so as to face the squeeze table 3. There is.
The squeeze head mechanism 9 includes a rectangular plate-shaped cylinder rear lid member 10 fixed to the lower surface of the gate-shaped frame 8 and a cylinder front lid member 11 supported by the rear lid member 10 via an elongated rod (not shown). The outer dimensions of the front lid member 11 are slightly smaller than the inner dimensions of the filling flask 6 and the casting flask 7, and the lower surface of the front lid member 11 is A squeeze plate 13 having the same outer dimensions as this is fixed, and the piston rods 14, 14 of the cylinders 12, 12 are slidably inserted into the squeeze plate 13, and the raised lower end surfaces of the piston rods 14, 14 are squeezed. It is almost at the same level as the lower surface of the plate 13. Further, the rear cover member 10 and the front cover member 11 are connected to a compressed air source 16 via a four-way directional switching valve 15, and compressed air is supplied to and exhausted from the cylinders 12 and 12 by operating the switching valve 15. The piston rods 14, 14 move up and down. Note that the thickness of the piston rods 14, the mutual spacing, the magnitude of the descending force by the cylinder 12, the number of piston rods, etc. are selected appropriately.
In short, when the piston rod 14 is lowered by supplying compressed air to the cylinder 12, it is possible to pierce the molding sand S so deeply that its lower end reaches close to the model plate 5 as shown in the figure. There are no limitations on the thickness, mutual spacing, etc.

In this structure, a predetermined molding sand S is dropped and filled into the flask 7 and the filling frame 6 mounted on the model plate 5 by conventional means (not shown).
The upper end opening of the filling frame 6 is closed by the squeeze plate 13, and then the switching valve 15 is operated to supply compressed air to the upper part of the cylinders 12, 12 through the rear lid member 10, and at the same time, the front lid member 11 is closed. When compressed air is discharged from the lower part of the intervening cylinders 12, 12,
As shown, the piston rods 14, 14 are
It is lowered so that the lower end reaches near the model plate 5 and the model part 4 and is located along their surfaces, and as a result, a part of the molding sand S is deposited in every corner of the model part 4 or in the part with sand. The molding sand near the model part 4 and the molding sand in the lower part of the sanded part are packed with high density by being pushed and compacted. Next, operate the switching valve 15 to switch the cylinder 1
Compressed air is discharged from the upper part of the cylinders 2, 12, and compressed air is supplied to the lower part of the cylinders 12, 12 to raise the piston rods 14, 14, and the molding sand S
Pull them out from the inside, make their lower surface level the same as that of the squeeze plate 13, and then raise the squeeze table 3 by extending the cylinder 2, and raise the mold plate 5, molding flask 7, etc. containing molding sand S, etc. , the squeeze plate 13, etc. are inserted into the filling frame 6, and the molding sand S is squeezed into the squeeze plate 13,
Squeeze using model plate 5 or the like to harden. After the squeeze is completed, the cylinder 2 is shortened to lower the flask 7 containing the squeezed molding sand S, the squeeze table 3, etc., and the filling frame 16 is removed from the squeeze plate 13, followed by an appropriate conventional means (not shown). The mold is released by raising the flask 7 etc. with the
Thereafter, another empty flask 7 is placed on the model plate 5 to complete the entire process.

In addition, in the above embodiment, the piston rod 14,
Although the magnitude of the descending force of the piston rods 14 is the same, the magnitude of the descending force of the piston rods 14, 14 can be changed by varying the inner diameter of the cylinders 12, 12 and the pressure of the compressed air supplied to the cylinders 12, 12. They may be different from each other. Further, although the operation of squeezing after inserting the piston rods 14, 14 is performed only once, this operation may be repeated several times. Furthermore, piston rod 1
Before inserting the piston rods 4 and 14, the squeeze table 3 may be raised to an appropriate height to lightly pre-compress the foundry sand, and then the piston rods 14 and 14 may be inserted and squeezed. Furthermore,
Although the squeeze head mechanism 9 is fixed to the ceiling of the gate-shaped frame 8, it may be movably provided at a position directly above the squeeze table 3 so that it can be carried in and out. Further, the cylinder 12 may be hydraulically operated.

As is clear from the above description, according to the present invention, since the rod member penetrates sufficiently deeply into the foundry sand,
Even for complex-shaped model plates, molding sand is filled in every corner and sanded part of the model plate in a high-density state without imparting stress, and molds with the required hardness and molding condition are accurately produced. In addition, since no jointing is performed, there is no need to generate vibration or noise pollution, and there is no need to increase the size of the molding machine.

[Brief explanation of the drawing]

The drawing is a partially cutaway front view showing an embodiment of the present invention. 3: squeeze table, 12: cylinder, 1
3: squeeze plate, 14: piston rod.

Claims (1)

[Claims] 1. A squeeze table 3 that is arranged to be able to be raised and lowered and has a model plate 4 on its upper surface, and a squeeze plate 13 that is provided above the squeeze table 3.
The piston rod 14 is mounted at an appropriate interval on the upper part of the squeeze plate 13.
have the same length and the squeeze plate 1
A plurality of downward cylinders 12 are vertically slidably inserted through the piston rod 14 and whose lower end surface level when the piston rod 14 is raised is approximately the same as the lower surface level of the squeeze plate 13; A mold making machine characterized by comprising a compressed air source 16 or a pressure oil source that are connected in communication via a switching valve 15.