JPH02251336A - Apparatus for making mold - Google Patents

Abstract

PURPOSE:To make a mold having the necessary hardness by arranging a rectangular frame body to a blow plate and interposing a pressing plate as ascendable/ descendable, which has a penetrating gas exhaust hole, between a blow head and a raising flask. CONSTITUTION:In apparatus for making the mold, molding sand is blown into the raising flask 10 and a molding flask 11 from the blow head 1 to form the mold. Then, the rectangular frame body 7 is arranged in the blow plate 6. Together with this, the pressing plate 13 as ascendable/descendable, which has the penetrating gas exhaust hole, is interposed between the blow head 1 and the raising flask 10. By this method, the packing of the molding sand can be uniformly executed over the whole molding flask.

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 type vI hardness substantially uniform.

(Prior art) There is a conventional mold making device as shown in Fig. 4 (for example, "New version casting method" (March 31, 1988))
Casting Technology Promotion Association, pp. 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 square cylinder 24 connected to the
A blow plate 25 is attached to the blow head 21, and a joint frame 26 and a casting flask 27 are attached to the model surface plate 22.
is placed.

(Problem to be solved by the invention) Lowered joint frame angle cylinder 24 and raised model surface plate 22
After crimping the splicing frame 26 and the casting flask 27 using
It is blown into the splicing frame 26 and the casting flask 27 together with compressed air. Next, the hydraulic pressure of the joint frame angle cylinder 24 is released, and the squeeze cylinder 23 is further raised to squeeze the blow spatulas 1 to 21 in order to equalize the hardness of the mold. Because the compressed air could not be sufficiently vented from the core, the sand density was not uniform, resulting in mold deformation due to the transportation 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 molding sand and easily make the entire molding sand to the required hardness. It is something to do.

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

(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 exhaust holes of the frame, joint frame, and press plate and is discharged into the atmosphere. Next, when the press plate is lowered to the blow plate surface, the molding sand in the vicinity of 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. 1 and 2 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 play 1-6 and a rectangular frame body are provided with a blow hole 5 in the lower part 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 1° and a casting flask 11 are placed on the model surface plate 9.

Four downward connecting cylinders 12 are installed around the sides of the blow head 1, and the cylinders 12 are connected to the four corners of the upper surface of the connecting frame 10. The splicing frame 10 and the casting flask 11 are formed so as to be crimped together. A pressing 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 large number of exhaust holes 15 are transparently provided in the press plate 1.3, and four downward pressure plate cylinders 16 are arranged around the circumference adjacent to the blow head 1 so as to be connected to the four corners of the upper surface of the press plate 13. It is set up.

Next, we will discuss the operation.

As shown in FIG. 1, the joint plug cylinder 12 is extended downward, and the squeeze cylinder 8 is extended northward to press the joint frame 10 and casting flask 11 together. Next, after the press plate cylinder 16 is contracted upward to raise the press 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 flask 10 and the flask 11. 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 joint frame 10 and the M frame 11, and the compressed air flows through the casting flask 11. Joint frame 10, exhaust hole 1 of press plate 13
5 and the rectangular gap 14 in order, and is discharged into the atmosphere. Thereafter, when the press plate cylinder 16 is extended downward and the press plate 13 is lowered to the blow plate 6 surface, molding sand (not shown) near the joint frame 10 and casting flask 11 is filled in a high density state. be done. After that, the hydraulic pressure of the coupling cylinder 12 is released, and the squeeze cylinder 8 is released.
When the molding sand (not shown) filled in the joint frame 10 and the casting flask 11 is pressed by extending it upward, the molding sand (
The entire foundry sand (not shown) becomes more dense, and the entire foundry sand (not shown) has the required hardness.

After the molding sand (not shown) has hardened, the squeeze cylinder frame 11 is taken out from the model surface plate 9, and 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).

(Effects of the Invention) According to the present invention, the blow plate is provided with a rectangular frame body, and a press plate that can be raised and lowered and has an exhaust hole transparent therebetween is interposed between the blow head and the joint frame. Even when the shape of the casting flask is complicated, the entire flask is filled with molding sand uniformly, and a mold having the required hardness can be easily and reliably formed. 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 broken pressure surface diagram showing one embodiment of the present invention;
3 is a sectional view of a main part of a press plate, FIG. 3 is a sectional view of 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. 1...Blow head, 6...Blow plate, 7.
... Frame body, 10 ... Joint frame, 13 ... Pressing plate, 15
...Exhaust hole.

Claims (1)

[Claims] In a mold making device that blows foundry sand from the blow head into the joint frame and casting flask, the blow plate has a rectangular frame body and an exhaust hole is provided between the blow head and the joint frame so that it can be raised and lowered freely. A mold making device characterized by having a pressure plate interposed therein.