JPH0357535A - Device for forming mold - Google Patents

Abstract

PURPOSE:To make packing of molding sand uniform by arranging rectangular frame body in a blow plate and providing venting holes in an outer frame and inner frame. CONSTITUTION:In the subject device sucking the molding sand into a rising flask 10 and casting flask 11 from blow head, the rectangular frame body 7 is arranged in the blow plate 6 and also the outer flask 12 composed of the raising flask 10 having the casting flask 11 and first venting holes 13a, 13b and the inner flask 16 as attachable/detachable having second venting holes 17a, 17b are provided. By this method, even in the case pattern has complicated shape, the packing of molding sand is uniformly executed over the whole casting flask and the mold having the necessary hardness can be easily and surely manufactured.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) 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 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
Blow plates 1 to 25 are 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) The lowered joint frame cylinder 24 and the raised model fixing ffi
After crimping the splicing frame 26 and the flask 27 with the molding flask 22, when compressed air of 2 to 3 kg/+nm is supplied to the blow head 21, the molding sand 28, together with the compressed air from the blow plate 25, is compressed into the splicing flask 26 and the flask. It is blown into 27. Next, the hydraulic pressure of the joint frame cylinder 24 is released,
The squeeze cylinder 23 is further raised to squeeze the blow head 21 in order to equalize the hardness of the mold, but since the compressed air cannot be sufficiently removed from the blown molding sand 28, the sand density is not uniform. Instead, mold deformation occurred during the transportation process or over time, and firmness occurred due to casting pressure. The present invention has been made to solve these problems, and provides a mold making device that can quickly remove the compressed air from the foundry sand and easily bring the entire foundry sand to the required hardness. be.

(Means for Solving the Problems) The mold making apparatus of the present invention includes a blow plate provided with a rectangular frame body, an outer frame consisting of a casting flask and a joint frame having a first exhaust hole, and a second exhaust hole. It is equipped with a removable inner frame.

(Function) When molding sand is blown into the inner frame fitted into the outer frame, the molding sand moves through the gap between the rectangular frame and the model and fills the inner frame with a predetermined amount. is discharged into the atmosphere from the second exhaust hole in the inner frame. Next, when the inner frame rises to the blow play plane 1 while pressing the molding sand appropriately, as the inner frame rises, the molding sand near the outer frame is filled in a high density state, and the compressed air blows into the inner frame. The second exhaust hole and the first joint frame
It is discharged into the atmosphere through the exhaust vent.

(Example) An example of the present invention will be described based on FIGS. 1 to 3. A mold making apparatus according to the present invention is shown in FIGS. 1 and 2, and a sand game 1-2 for filling the inside with molding sand (not shown) is attached to the upper part of a fixed blow head l. With, Brohesod]. A compressed air supply port 3 and a compressed air discharge port 4 are provided for supplying and discharging compressed air,
A blow plate 6 with a blow hole 5 provided in the lower part thereof is provided.
A rectangular frame body 7 is also provided.

A squeeze cylinder 8 that can be raised and lowered is provided below the blow bed 1. A model surface plate 9 is connected to the squeeze cylinder 8. A joint frame 10 and a casting flask 11 are placed on the model surface plate 9. The outer frame 12 is formed from the flask l1. The joint frame 10 and the casting flask 1] are formed from a hollow metal frame, and the joint frame 10 has a number of first exhaust holes 13a, 1.
3b and a rectangular first air chamber 14 are provided.

On the side of the blow head ■ there are 4 1,1i'iJ 1/
J-frame cylinders 15 are provided around the periphery, and the cylinders 15 are connected to two sides and four corners of a rectangular inner frame 16. The inner frame 16 is shaped so that it can be freely inserted into the outer frame l2 by the cylinder ↓5, and the inner frame upper part 6 is provided with a large number of second exhaust holes 17a, ]-7b and a rectangular second air chamber 18. ing.

Next, we will discuss the operation.

As shown in FIG. 1, the inner frame cylinder 15 is extended downward, and the squeeze cylinder 8 is extended in both directions to attach the outer frame 12 consisting of the connecting frame 10 and the casting flask 11.
The inner frame 16 is inserted and the outer frame 12 and the inner frame 16 are engaged with each other. Next, when compressed air is supplied into the blow head 1 from the compressed air supply port 3, molding sand (not shown) is blown into the inner frame 1-6 from the professional plate 6 together with the compressed air.

The molding sand (not shown) moves along the model 19 through the gap between the rectangular frame 7 and the model ↓9, and fills the inner frame 16 with a predetermined amount, and compressed air is supplied to the second inner frame 6. After being temporarily accommodated in the second air chamber 18 through the exhaust hole 17a, it is discharged into the atmosphere through the second exhaust hole 17b. Next, the cylinder 15 for the inner frame is contracted upward, and the cylinder 15 is contracted upward, while the upward contraction operation, stopping, and downward extension operation are repeated as appropriate.
When the air is raised to the blow plate 6 surface, the compressed air flows through the inner frame ↓ 6 and the first and second exhaust holes of the joint frame 10]. 3 a
, 1. 7a, and is once accommodated in the first and second air chambers 4 and 8, and is then discharged into the atmosphere from the first and second exhaust holes 13b and 17b of both air chambers 14 and 18, and is discharged into the atmosphere near the outer frame 12. molding sand (not shown) is packed in a dense state. Thereafter, when the squeeze cylinder 8 is extended upward and pressed against the molding sand (not shown) filled in the outer frame 2, the entire molding sand (not shown) becomes even more dense. 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. 3 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.

6- (Effects of the Invention) According to the present invention, the blow plate 1 is provided with a rectangular frame body, and an outer frame consisting of a flask and a joint frame that fits the upper exhaust hole, and a second exhaust hole are provided. Even if the shape of the model is complex, the molding sand can be filled uniformly over the entire flask, making it possible to easily and reliably create a mold with the required hardness. . 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 drawings]

FIG. 1 is a partially cutaway front view showing one embodiment of the present invention, and FIG.
FIG. 3 is a cross-sectional view of the main part of the inner frame, FIG. 3 is a cross-sectional view showing a mold that has been molded, and FIG. 4 is a partially cutaway front view of a conventional mold making apparatus showing a state in which molding sand is blown into the mold. 6... Blow plate, 7... Frame body, 1o... Joint frame, 11... Casting flask, "-2... Outer frame, 13,),
13})...first exhaust hole, 16...inner frame, 1. 7
a, 17b... second exhaust hole. 71 No. 2 {λ Figure 3 No. 4 Procedural amendment (voluntary) 1. Case Description 1999 Patent Application No. 19-120 2. Name of invention Mold making device 3. Relationship with the person making the amendment Patent applicant address: 1 Tenno, Takaoka Shinmachi, Toyota City, Aichi Prefecture 473 (Telephone: 0565-52-1133) 5. Figure 4 of the drawing subject to amendment

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 blow plate is provided with a rectangular frame body, and an outer frame consisting of a casting flask and a joint frame having a first exhaust hole; A mold making device characterized by comprising a removable inner frame having two exhaust holes.