JPH02290649A - Molding apparatus for mold - Google Patents

Abstract

PURPOSE:To easily and surely make a mold having uniform necessary harness by ascending/descending a pressing plate arranged with projecting member and vent hole after blowing molding sand into a raising flask arranged with the vent hole and a casting flask and squeezing the molding sand. CONSTITUTION:A pattern 19 and the casting flask 11 are set on a pattern surface plate 9 providing a squeeze cylinder 8, and a raising flask 10 is brought into press-contact with the casting flask 11. Into this casting flask 11 and raising flask 10, the molding sand is blown from a blowing head 1 with compressed air and successively, the pressing plate 13 arranged between the blowing head 1 and the raising flask 10 is ascended/descended with a cylinder 17 to squeeze the molding sand. In the above molding apparatus, a rectangular frame body 7 is arranged to a blowing plate 6 in the blowing head 1 and the molding sand is introduced into gap between the frame body 7 and the pattern 19 and uniformly packed. Further, the vent holes 18, 16 are bored to the raising flask 10 and the pressing plate 13 respectively to vent the compressed air, and further, the projecting member 15 is arranged to the pressing plate 13 and the packed molding sand is compacted uniformly to high density.

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. 4 (for example, "New version casting method" (Showa 63, March, 1983)
) 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 2.
A blow plate 25 is attached to the blow head 21, and a joint frame 26 and a casting flask 2 are attached to the model surface plate 22.
7 is placed.

(Problem to be solved by the invention) 1. Lowered joint frame cylinder 24 and raised model surface plate 2
After crimping the joint frame 2G and the casting flask 27 with 2,
When 2 to 3 kg/no of compressed air is supplied to the blow head 21, the molding sand 28 is blown from the blow plate 25 into the joint frame 26 and the casting flask 27 together with the compressed air. Next, the hydraulic pressure of the joint frame cylinder 24 is released, the squeeze cylinder 23 is further raised, and the blow head 21 is
However, since the compressed air cannot be sufficiently removed from the injected molding sand 28, the density of the sand is not uniform, and the mold hardness increases due to the transportation process or the passage of time. Harness occurred due to deformation and 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 ayumono sand and easily make the entire foundry sand to the required hardness. It is.

(Means for solving the problem of stress) The present invention provides a blow plate with a rectangular frame body, provides an exhaust hole in the joint frame, and provides a protruding member and a large number of exhaust holes between the blow heel 1 and the joint frame. This is a mold making device equipped with a suppressing plate with holes that can be raised and lowered.

(Function) When molding sand is blown into the joint frame and casting flask, 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 flows through the casting flask. It sequentially flows through the frame, the joint frame, and the first exhaust hole of the suppression plate and is discharged into the atmosphere, and is also discharged into the atmosphere through the second exhaust hole of the joint frame. Next, while squeezing the suppressing plate in the vertical direction several times, the suppressing plate is lowered to the pro-plate surface, and the molding sand near the joint frame and casting flask is filled in a high density state.

(Example) An example of the present invention will be described based on FIGS. 1 to 3. Figures 1 and 2 show a mold making apparatus according to the present invention, and a blow head 1 is fixedly installed, and on the top thereof, sands 1 to 2 are installed for filling the inside with molding sand (not shown). In addition, 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 body are provided at the bottom thereof. 7 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 connecting frame 10 and the casting flask 11 are formed so as to be crimped together. A suppression plate 13 made of a rectangular frame is interposed between the blow head 1 and the joint frame 10, and a rectangular gap 1 is provided for discharging compressed air into the atmosphere.
4 is formed. Furthermore, a rectangular protruding member 15 and a large number of exhaust holes 16 are transparently provided in the suppression plate 13, and the blow heel 1- It is located adjacent to 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 18 for discharging compressed air into the atmosphere.
is drilled.

Next, the operation will be described.

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, after the suppression plate cylinder 17 is contracted upward to raise the suppression plate 13, compressed air is supplied into the blow head 1 from the compressed air supply port 4, and molding sand (not shown) is supplied together with the compressed air. ) is blown from the blow plate 6 into the joint flask 1o and the flask 11. The molding sand (not shown) moves along one model through the gap between the rectangular frame 7 and the model 19, filling every corner of the joint frame 10 and the casting flask 11, and the compressed air flows into the casting flask 11. , joint frame 10, exhaust hole 1 of press plate 13
5 and the rectangular gap 14 in order to be discharged into the atmosphere, and at the same time, it is discharged into the atmosphere through the wandering hole 18 of the joint frame 10.

After that, the suppression plate cylinder 17 is extended downward and then retracted upward to squeeze the suppression plate 13 in the vertical direction several times and lower the suppression plate 13 to the blow head 6 surface. 10 and molding sand (not shown) near the flask 11 is filled in a high density state. After that, the hydraulic pressure of the joint frame cylinder 12 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 foundry sand (not shown) becomes more dense,
As a result, 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 crucible frame 10 is removed from the mold, and then the molded flask 11 is placed on the model surface plate 9.
When taken out, a poem shape as shown in Figure 3 is obtained. Thereafter, another empty casting flask 11 is placed on the model surface plate 9, and the blow holes i-1 are filled with molding sand (not shown) from the sand gate 2.

(Effects of the Invention) According to the present invention, a rectangular frame rest is provided in the blow plate, an exhaust hole is provided in the joint frame, and a protruding member and a large number of exhaust holes are provided between the blow head and the joint frame. H.
Because the suppressor plate is provided so that it can be lowered freely, even if the shape of the model is complex, the filling of molding sand is done uniformly over the entire flask.
A mold having the required hardness can be easily and reliably produced.

Moreover, no large amount of energy is required during molding, noise and vibration can be reduced, and molding work can be facilitated and speeded up.

[Brief explanation of the drawing]

Fig. 1 is a partially broken pressure surface diagram showing one embodiment of the present invention;
FIG. 3 is a sectional view of the main part of the suppressing plate, FIG. 3 is a sectional view showing a molded η-type, and FIG. 4 is a partially broken pressure surface view of a conventional mold making apparatus showing a state in which molding sand is injected. 1...Blow head, 6...Blow play-1, 7
... Frame body, 10 ... Joint frame, 13 ... Pressing plate, 1
5... Projection member, 16, 18... Exhaust hole.

Claims (1)

[Claims] 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, an exhaust hole is provided in the joint frame, and a protrusion between the blow head and the joint frame is provided. A mold making device characterized by being provided with a press plate that can be raised and lowered and is equipped with a member and a large number of exhaust holes.