JPH02290648A - Molding apparatus for mold - Google Patents

Abstract

PURPOSE:To easily and surely make a mold having uniform hardness by arranging a rectangular frame body to a blowing plate and providing divided pressing plates arranging a vent hole between a raising flask arranging the vent hole and a blowing head as possible to ascend/descend. CONSTITUTION:A pattern 17 and a casting flask 11 are set on a surface plate 9 laid on a squeeze cylinder 8. The raising flask 10 boring the vent hole 18 is brought into press-contact with this casting flask 11 through a cylinder 12. Successively, molding sand is blown into the casting flask 11 and raising flask 10 through the blowing plate 6 in the blowing head 1. The molding sand is uniformly supplied from blowing hole 5 through the rectangular frame body 7 arranged to the blowing plate 6. Successively, the divided pressing plates 13a, 13b between the blowing head 1 and the raising flask 10 is ascended/ descended with cylinders 16a, 16b to squeeze the molding sand. Then, air in the sands is vented from the above vent hole 18 and vent hole (not shown in the figure) penetrated in the pressing plates 13a, 13b. By this method, the mold of desired hardness uniformly pressed can be formed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to an improvement in a mold making device, and more particularly, to a mold making device that can make mold hardness substantially uniform.

(Prior art) As a conventional mold making device, there is one as shown in Fig. 6 (for example, "New version casting method" (Showa 63, March 31)
Foundry Technology Promotion Association. P. 28-30). This thing consists of a fixed blow head 21, a model surface plate 22 connected to an upward squeeze cylinder 23, and a joint frame 26.
and a downward joint frame cylinder 24 connected to the
A blow plate 25 is attached to the blow head 21, and a joint frame 26 and a casting frame 27 are attached to the model surface plate 22.
is placed.

(Problem to be solved by the invention) Lowered joint frame cylinder 24 and raised model surface plate 22
After compressed air of 2 to 3 kg/+nm is supplied to the blow head 21, the molding sand 28 is blown into the joint frame 26 and the flask 27 together with the compressed air from the blow plate 25. blown inside.

Next, the hydraulic pressure of the joint frame cylinder 24 is released, and the squeeze cylinder 23 is further raised to squeeze the blow head 21 in order to equalize the hardness of the mold. Because the compressed air cannot be sufficiently vented from the sand, the density of the sand is not uniform, resulting in mold deformation due to the conveyance process or the passage of time, and firmness due to casting pressure. Therefore, the present invention has been made to solve this problem, and provides a mold making device that can quickly remove the compressed air from the foundry sand and easily make the entire foundry sand to the required hardness. be.

(Means for Solving the Problems) The present invention provides a blow plate with a rectangular frame body, a joint frame with an exhaust hole, and a vertically movable structure with an exhaust hole transparent between the blow head and the joint frame. This is a mold making device equipped with a divided press plate.

(Operation) When molding sand is blown into the joint frame and casting flask. t=D The sand moves through the gap between the rectangular frame and the model, filling every corner of the joint frame and casting flask, and the compressed air passes through the casting flask, joint frame, and exhaust holes of the divided pressing plate in order. It is also discharged into the atmosphere through the exhaust hole of the joint frame. Thereafter, when the divided pressing plate is lowered to the blow plate surface while repeating the squeeze process several times in which the divided pressing plate is sequentially lowered and then raised sequentially, the molding sand in the joint frame and the vicinity of the flask is filled in a high density state.

(Example) An example of the present invention will be described based on FIGS. 1 to 4. 1 to 3 show a mold making apparatus according to the present invention, in which a sand gate 2 for filling the inside with molding sand (not shown) is attached to the upper part of a fixed blow head 1. , a compressed air supply port 3 and a compressed air discharge port 4 are provided for supplying and discharging compressed air to the blow head 1, and a blow plate 6 having a blow hole 5 therethrough and a rectangular frame 7 are provided at the bottom thereof. It is provided.

A squeeze cylinder 8 that can be raised and lowered is provided below the blow head 1. A model surface plate 9 is connected to the squeeze cylinder 8, and a joint frame 10 and a casting flask 11 are placed on the model surface plate 9.

Four downward-facing joint frame cylinders 12 are installed around the sides of the blow head 1, and these cylinders 12 are connected to the four corners of the upper surface of the joint frame 10, and the cylinders 12 that have been lowered and the model surface plate 9 that has been raised are connected to each other. The splicing frame 10 and the casting flask 11 are formed so as to be crimped together. Separate pressing plates 13a, 13l) are interposed in the lower part of the gap between the blow head 1 and the joint frame 10, and a rectangular passage 14 for discharging compressed air into the atmosphere is formed in the upper part of the gap. There is. The divided pressure plate consists of a first divided pressure plate 13a arranged at the four corners of the lower part of the gap and a second divided pressure plate 13b arranged between the pressure plates 13a, and the first to second divided pressure plates 13a ．． Exhaust holes 15a and 15b are transparently provided in the exhaust hole 13b, and the first and second exhaust holes facing downward are provided.
An appropriate number of press plate cylinders 16a, 16b are connected, and the cylinders 16a. 16b is disposed adjacent to and around the blow head 1.

The joint frame 10 is formed from a hollow metal frame, and a predetermined portion of the joint frame 10 is provided with an exhaust hole 1B for discharging compressed air into the atmosphere.
is drilled.

Next, we will discuss the operation.

As shown in FIG. 1, the joint frame cylinder 12 is extended downward, and the squeeze cylinder 8 is extended upward to press the joint frame 10 and casting flask 11 together. Next, the first and second press plate cylinders 16a. 16b is contracted upward to release the first and second divided press plates 13a. 13b is raised, compressed air is supplied into the blow head 1 from the compressed air supply port 4, and molding sand (not shown) is transferred from the blow plate 6 to the joint frame 10 and the casting flask 11 together with the compressed air.
blown inside. The molding sand (not shown) moves along the model 17 through the gap between the rectangular frame 7 and the model 17, filling every corner of the splicing frame 10 and the casting flask 11, and compressed air flows through the casting flask 11, The flow passes through the joint frame 10, the exhaust holes 15a and 15b of the first and second press plates 13a and 13b, and the rectangular passage 14 in order and is discharged into the atmosphere, and the exhaust hole 1 of the joint frame 10
8 is emitted into the atmosphere.

After that, when the first and second press plate cylinders 16a and 16b are extended downward and then retracted upward,
A series of squeezes are performed in sequence: lowering of the first divided pressing plate 13a, lowering of the second divided pressing plate 13b, raising of the first divided pressing plate 13a, and raising of the second divided pressing plate 13b,
While repeating the squeeze several times, the first to second divided pressing plates 1
3a. When 13b is lowered to the blow head 6 surface, molding sand (not shown) near the joint frame 10 and casting flask 11 is filled in a high density state. After that, the joint frame cylinder 1
When the hydraulic pressure of 2 is released and the squeeze cylinder 8 is extended upward to press the molding sand (not shown) filled in the joint frame 10 and the casting flask 11, the entire molding sand (not shown) is released. becomes even more dense, so that the entire foundry sand (not shown) has the required hardness.

After the molding sand (not shown) has hardened, the squeeze cylinder 8 is contracted downward to lower the model surface plate 9 and the splicing frame 10 is removed from the mold.
When taken out, a mold as shown in FIG. 4 is obtained. After that, another empty casting flask 11 is placed on the model surface plate 9, and molding sand (not shown) is poured into the blow head 1 from the sand gate 2.
to be filled with.

FIG. 5 shows another divided pressing plate, in which the first divided pressing plate 23
a is formed from an L-shaped member having an L-shaped protrusion 24 on the lower surface, and the second divided pressing plate 23b is formed in the same manner as the second divided pressing plate 13b, and the divided pressing plate is divided into] It has the same effect as a pressure plate.

(Effects of the Invention) According to the present invention, the blow plate is provided with a rectangular frame body, the joint frame is provided with an exhaust hole, and the exhaust hole is transparent between the blow head and the joint frame so that the blow plate can be freely raised and lowered. Since the press plate is provided, even if the shape of the model is complex, the entire flask is uniformly filled with molding sand, and a mold having the required hardness can be easily and reliably formed. In addition, it does not require a large amount of energy during molding and can reduce noise and vibration.
Molding work can be made easier and faster.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway front view showing one embodiment of the present invention, and FIG.
The figure is a bottom view of the divided pressure plate, Figure 3 is a sectional view of the same main part, and Figure 4 is a sectional view of the same main part.
FIG. 5 is a bottom view of another divided pressure plate, and FIG. 6 is a partially cutaway pressure surface view of a conventional mold making apparatus showing a state in which molding sand is blown. 1...Blow head, 6...Blow play-1-, 7
...Frame. 10... joint frame, 13a, 23a...
First divided pressure plate, 1; 3b, 23b... Second divided pressure plate, 15a, 15b, 18... Exhaust hole, 24...L
Letter-shaped protrusion. Figure 1

Claims (3)

[Claims] (1) In a mold making device that blows foundry sand from a blow head into a joint frame and a casting flask, a rectangular frame body is provided on the blow plate, and an exhaust hole is provided in the joint frame, so that the blow head and joint frame are A mold making device characterized by being provided with a divided pressing plate that can be raised and lowered with an exhaust hole transparent therebetween. (2) The mold making apparatus according to claim 1, wherein the divided pressing plates are arranged at four corners of the gap between the blow head and the joint frame and between the four corners. (3) The mold making apparatus according to claim 2, wherein the divided press plates disposed at the four corners of the gap between the blow head and the joint frame are formed from L-shaped members having L-shaped protrusions.