JPS6410304B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for molding a large-sized horizontally split mold and an apparatus used therefor.

As a conventional method for manufacturing a large-sized horizontally split mold, there is a method as disclosed in Japanese Patent Publication No. 51-26291, for example.

This molding method involves placing the upper and lower casting flasks in contact with the upper and lower surfaces of the match plate, then blowing molding sand into each flask, squeezing the molding sand from above and below at the same time, and then removing the upper and lower molds after removing the mold. The method involved matching the shapes and then cutting out the frame.

However, with this method, it is necessary to intermittently rotate a large number of upper and lower flasks together with the upper and lower molds simultaneously in the horizontal direction, making the equipment large and expensive. There was a risk that the mold surface hardness would not be sufficient.

In addition to the above-mentioned molding method, there is also a method of molding the upper and lower molds separately, but with this method, it is necessary to invert one of the upper and lower molds when matching the molds, and an inversion holding mechanism is required for this purpose. , the equipment has become complicated and expensive.

In view of the above, an object of the present invention is to provide a method for manufacturing a horizontally split mold with a flask type, which allows the molding device to be small and simple in structure, and which can obtain sufficient mold surface hardness for both the upper and lower molds. shall be.

Another object of the present invention is to provide a molding device for a horizontally split mold with a flask type, which is small in size and simple in structure, and is capable of obtaining sufficient mold surface hardness for both the upper and lower molds.

The gist of this invention is to mold a lower mold by inserting a model plate that also serves as a squeeze plate into a lower frame placed on a surface plate from above, and after cutting out the frame and die, mold the model at a different position. A molding method for a frame-cutting type horizontally split mold, in which an upper frame is placed on a plate, the mold is molded, the released upper mold is molded to the lower mold, and the upper mold is subsequently punched out, and a first fixed mold. Directly above the plate lifting means, there is a lower molding area in which a lower frame and a downward model plate are arranged so as to be movable up and down, a mold matching area in which a second surface plate lifting means is arranged, and an upper mold. A horizontal surface plate conveying means is provided between the lower molding part and the mold matching part, and an upper frame that can be raised and lowered is provided between the upper part of the upper molding part and the mold matching part. A molding device for a horizontally split mold with a frame-extracting type is provided with an upper frame conveying means capable of conveying a squeeze plate which can be freely raised and lowered so as to be inserted into the upper frame.

Hereinafter, one embodiment of the present invention will be described based on illustrated examples.

Fig. 1 is a partially cutaway front view of the present invention, Fig. 2 is a plan view of Fig. 1, Fig. 3 is a right side view of Fig. 1, Fig. 4 is a schematic plan view of the rotary table, and Fig. 5- FIG. 6 is an enlarged partial sectional view of the upper mold and the lower mold, respectively.

On the base 1, a rotary table 6 for transporting a surface plate 5 on which a lower frame is placed and used when molding the lower mold 2 is supported by a rotary shaft 7, and is a horizontal cylinder. 8 so that it can rotate intermittently.

This rotary table 6 has a cross shape, and each protruding portion thereof serves as a surface plate mounting portion 11. The symmetrical positions of the surface plate mounting portion 11 of the rotary table 6 are a mold matching region B and a lower mold forming region A, respectively.

A first elevating table 12 is disposed at a position below the surface plate mounting section 11 in the lower molding region A so as to be movable up and down by an upward cylinder 13. through hole 15
It can pass through and protrude slightly above the upper surface of the surface plate mounting part 11. First lifting table 12
Directly above the lower frame 16, a lower frame 16 is arranged so as to be movable up and down by two downward cylinders 21 held by a ceiling frame 18 supported by six columns 17, and a cylinder that can be fitted into the lower frame 16. A downward-facing lower model plate 22 which also serves as a downward-facing squeeze plate is arranged so as to be able to rise and fall freely via a mounting plate 25 using a downward-facing squeezing cylinder 23 also held on the ceiling frame 18. A lower molding chamber 26 is formed by the frame 16 and the model plate 22. A blow head 27 for blowing molding sand into the lower molding chamber 26 is disposed behind the cylinder 23.
The air outlet 28 is bent forward and the lower frame 16
It can be airtightly joined to the outer surface of an air inlet (not shown) formed on the back surface of the. Further, a hopper 33 is disposed at the upper end of the blow head 27 via an opening/closing plate 32 which is opened and closed by a horizontal cylinder 31.

In addition, 56 is a roller conveyor with a flange for replacing the lower model board, which is located below the mounting plate 25 when ascending, extends in the front and back direction, and is rotatably mounted on the ceiling frame 18. It is installed vertically via support rods 57, 57. Horizontal cylinders 58, 58 disposed on the ceiling frame 18 are connected to the support rods 57, 57, respectively, and the expansion and contraction of the cylinders 58, 58 moves the pair of conveyor frames of the roller conveyor 56. The conveyor frames 59, 59 are adapted to be opened and closed from side to side, and the conveyor frames 59, 59 are usually opened wide enough to allow the lower frame 16 to move up and down.

A second elevating table 34 is disposed below the surface plate mounting section 11 in the mold matching region B so as to be movable up and down with an upward cylinder 35, and the second elevating table 34 is opened to the surface plate mounting section 11. It passes through the through hole 15 and can protrude slightly upward from the upper surface of the surface plate mounting part 11.

Further, the left position of the rotary table 6 on the base 1 is an upper mold molding region C.

An upwardly facing upper model plate 36 can be placed on a support device 37 on the base 1 in the upper mold molding region C. On both sides of the support device 7, roller conveyors 38 with flanges for exchanging model plates are disposed and extend to the front.

Further, a collared roller conveyor 41 is disposed on the lower surface of the ceiling frame 18 from directly above the support device 37 to a position directly above the second elevating table 34, and a trolley 42 (not shown) runs over this conveyor 41. It is mounted on a horizontal cylinder so that it can move freely.

On this trolley 42, an upper frame 43 is held movably up and down by left and right downward cylinders 45, 45, and a squeeze plate 46 that can be fitted into the upper frame 43 is arranged so as to be movable up and down by a central downward cylinder 47. When the truck 42 is located directly above the support device 37, the model plate 36, the upper frame 43, and the squeeze plate 46 form an upper molding chamber 48. A blowhead 51 for blowing molding sand into the upper molding chamber 48 is disposed such that its blower port 52 can be brought into close contact with a blower port (not shown) provided on the back side of the upper molding chamber 48. A hopper 55 is disposed at the upper end of the blow head 51 via an opening/closing plate 54 which is opened and closed by a horizontal cylinder 53, as described above.

Next, a method for manufacturing a superimposed mold using the above-mentioned flask type horizontally split mold manufacturing apparatus will be described.

(1) The lower mold is molded in the lower mold molding area A as follows.

The first elevating table 12 is raised by the extension action of the cylinder 13, and the surface plate 11 is moved to the elevating table 1.
2 and push it up slightly from the top surface of the surface plate mounting section 11. Next, the cylinders 21, 21
By the extension operation, the lower frame 16 is lowered and placed on the surface plate 5, and the air outlet 2 of the blow head 27 is opened.
8 is connected to the air inlet of the lower frame 16, and furthermore, by the extension operation of the cylinder 23, the downward model plate 22 is fitted into the lower frame 16 to form the lower molding chamber 26.
As shown in FIG. 5, molding sand is blown into the lower molding chamber 26 formed by the surface plate 5, the lower frame 16, and the model plate 22 using compressed air from the blow head 27, and then the cylinder 23 is filled with molding sand. The model plate 23 is further lowered by the extension operation, and the molding sand in the lower mold molding chamber 26 is squeezed by the surface plate 5 and the model plate 22 to mold the lower mold 2. At this time, since the molding sand is directly squeezed from above using the model plate 22, a mold surface with higher hardness can be obtained than when squeezing is performed by fixing the model plate and raising the surface plate from below.

After completion of this squeeze, while the model plate 22 is lowered, the lower frame 16 is raised by the shortening operation of the cylinders 21, 21 to perform frame cutting, and further the model plate 22 is cut out by the shortening movement of the cylinder 23.

Subsequently, the second elevating table 34 is lowered by the shortening operation of the cylinder 35, and the surface plate 5 on which the lower mold 2 is placed is placed on the surface plate mounting part 11, and then the rotary table 6 is lowered by the extension and contraction movement of the cylinder 8. Rotate horizontally 90 degrees in the direction of the arrow (rotation to the left). Then, the lower mold 2 is transported to the front position F, and the empty surface plate 5 located at the rear position R is transported to the lower mold molding site A.

Here, the lower mold is again molded in the same manner as above, and after placing the surface plate 5 on which the lower mold 2 is placed on the surface plate mounting part 11, the rotary table 6 is further moved by the expansion and contraction movement of the cylinder 8. Rotate horizontally 90 degrees in the direction of the arrow (rotate left). Then, the lower mold 2 located at the front position F described above is transported to the mold matching region B, and the lower mold 2 located at the lower mold molding region A is transported to the front position F, respectively. Incidentally, if necessary, the core is assembled to the lower mold 2 in the front position.

(2) Corresponding to the above-mentioned molding of the lower mold being performed one by one, the molding of the upper mold is performed in the lower mold molding region C as follows.

After the empty upper frame 43 and the like are conveyed together with the trolley 42 to a position directly above the upper model plate 36, that is, to the upper molding part C, by the extension operation of the cylinders (not shown), the cylinders 45, 45 are extended. The upper frame 43 is lowered and placed on the model board 36, and the air outlet 52 of the blow head 51 is connected to the air outlet of the upper frame 43. Furthermore, the squeeze plate 46 is placed on the upper frame 43 by the extending action of the cylinder 47. The upper molding chamber 48 is formed by fitting. As shown in FIG. 6, the model board 36, the upper frame 43, and the squeeze board 46
After filling molding sand by blowing compressed air from the blow head 51 into the upper molding chamber 48 formed by the molding chamber 48, the squeeze plate 46 is further lowered by the extension action of the cylinder 47, and the model plate 36 and the squeeze plate 46 are separated. The molding sand in the upper mold molding chamber 48 is squeezed to mold the upper mold 3.

After the squeeze is completed, the squeeze plate 46 is raised by the shortening operation of the cylinder 47, and the upper frame 43 is raised by the shortening operation of the cylinders 45, 45 until the lower surface of the squeeze plate 46 comes into contact with the upper surface of the upper die 3.

(3) The upper mold 3 molded in this way is moved together with the squeeze plate 46 and the upper frame 43 by the carriage 42 by the extension action of a cylinder (not shown), and the lower mold 2 is placed in the mold assembly where the lower mold 2 is waiting. Part B
The upper die 3 is then conveyed to the upper die 3 and the upper die 3 is cut out.

The second elevating table 34 is raised by the extension action of the cylinder 35, and the lower mold 2 is lifted up from the surface plate mounting part 11 together with the surface plate 5. The molds are matched by contacting the lower surface, and then the upper frame 43 is raised by the shortening operation of the cylinders 45, 45 to perform frame cutting. At this time, the pressing force of the cylinder 35 is very weak, and the mating surfaces of the upper mold 3 and the lower mold 2 are not damaged during mold matching.

The upper and lower molds 2 and 3 overlapped in this way,
The second elevating table 35 due to the shortening operation of the cylinder.
is lowered and placed on the surface plate mounting section 11 together with the surface plate 5. Subsequently, when the rotary table 6 is rotated 90 degrees to the left by the expansion and contraction movement of the cylinder 8, the upper and lower molds 2 and 3 come to the rear position R, and here, the upper and lower molds 2 and 3 are moved onto a conveyor etc. by appropriate means. When the mold is pushed out from above the surface plate 5 and the rotary table 6 is further rotated 90 degrees to the left, the empty surface plate 5 is transported to the lower mold molding area A and one cycle is completed.

In this way, the upper and lower molds are molded at different positions in synchronization with each other, and the molds are cut and framed separately.Furthermore, the upper mold is superimposed on the lower mold to form a complete piece. It is sent out from the device as a mold.

In the above embodiment, squeezing is performed immediately after blowing the foundry sand into the molding chamber, but before squeezing, air at a higher pressure than the air pressure for blowing foundry sand is supplied into the flask. However, if the molding sand is allowed to flow through the molding sand and discharged from the model plate, the molding sand is sufficiently moved and filled into the parts of the model plate where sand is poorly clogged, and then the squeeze is performed.
The required mold surface hardness can be easily obtained even for a model plate with a complicated shape.

Further, in the above embodiment, the surface plate is conveyed by a rotary table, but other conveyance means such as an endless chain conveyor with a surface plate attached thereto may be used.

Since the method and apparatus for manufacturing a frame-opening horizontally split mold of the present invention have the above-described method and configuration, the following effects can be achieved.

(a) One upper mold and one lower mold are enough.
Moreover, there is no need to horizontally rotate a large number of upper and lower molds at the same time, and there is no need to invert the molds, so the entire molding apparatus becomes compact and simple in structure.

(b) When molding the lower mold, the molding sand is directly pressed and squeezed by the downward facing lower mold plate.
There is no risk of not being able to obtain sufficient mold surface hardness, as is the case with match plates.

[Brief explanation of the drawing]

The figures show one embodiment of the present invention, in which Fig. 1 is a partially cutaway front view, Fig. 2 is a plan view of Fig. 1, and Fig. 3 is a partially cutaway front view.
The figure is a right side view of Fig. 1, Fig. 4 is a schematic plan view of the rotary table, and Figs.
FIG. 6 is an enlarged partial cross-sectional view when molding the upper mold. 2...Lower die, 3...Upper die, 5...Surface plate, 6...Rotary table (surface plate conveyance means), 11...Surface plate mounting portion, 12
...First lifting table (first surface plate lifting means), 16
...lower frame, 22...lower model board, 26...lower molding chamber,
27, 51...Blow head (molding sand blowing means), 34...Second elevating table (second surface plate elevating means), 36...Upper model plate, 42...Dolly (upper frame conveying means), 43...Upper frame, 46 ...Squeeze board, 48...
Upper molding room.

Claims (1)

[Claims] 1. After moving the upper mold molded by the following method (B) together with the upper frame with a squeeze plate onto the lower mold molded by the following method (A), A molding method for a frame-cutting type horizontally split mold, which is characterized by carrying out frame-cutting. (A) A lower molding chamber is formed by inserting a lower mold plate into the lower frame placed on the surface plate from above, and after blowing molding sand, squeeze the lower mold with the lower mold plate to form the lower mold. After molding, frame cutting and die cutting are performed sequentially. (B) After blowing molding sand into the upper molding chamber formed by inserting a squeeze plate from above into the upper frame placed on the upper model plate, molding sand is squeezed with the squeeze plate to mold the upper mold. . 2. A surface plate conveying means in which the following lower mold forming region A, the following mold matching region B, and the following upper mold molding region C are arranged side by side, and the surface plate can be transported horizontally between the lower mold molding region and the mold matching region. is provided, and an upper frame conveyor is provided that is capable of conveying an upper frame that can be raised and lowered between directly above the upper molding part and the mold matching part, and a squeeze plate that can be freely raised and lowered so that it can be inserted into the upper frame. 1. A molding device for a horizontally split mold of a frame extraction type, characterized in that a means is provided. (A) A first surface plate elevating means is provided below, a lower frame elevating means is provided directly above and opposite to the first surface plate elevating means, and a downward lower mold model that also serves as a squeeze plate is provided on the lower frame. A mold plate elevating means is provided so that a plate can be inserted, and a lower mold chamber is formed by a surface plate, a lower frame, and a lower mold plate, and molding sand is blown into the lower mold chamber. The lower molding part where sand blowing means is provided. (B) A mold matching part where a second surface plate lifting means is provided below. (C) A model plate is provided at the bottom, and a squeeze plate that can be inserted into the upper frame is provided so as to be freely raised and lowered, so that an upper molding chamber is formed by the upper model plate, the upper frame, and the squeeze plate. an upper mold molding section, further comprising a molding sand blowing means for blowing molding sand into the upper mold molding chamber.