WO2001054845A1

WO2001054845A1 - Method and device for collapsing and separating mold material and mold green sand from green sand mold

Info

Publication number: WO2001054845A1
Application number: PCT/JP2001/000444
Authority: WO
Inventors: Ryoji Kanayama; Hisashi Harada; Hiroaki Tokita; Kazuo Sugimoto; Takehiko Matsumoto; Hiroyasu Makino; Yasunori Yoshida; Shigeaki Yamamoto; Kuniyasu Mori
Original assignee: Sintokogio, Ltd.
Priority date: 2000-01-28
Filing date: 2001-01-24
Publication date: 2001-08-02
Also published as: BR0104248A; EP1205270A1; EP1205270A4; CN1362901A; KR20010113871A

Abstract

A method and a device for collecting sand from a poured green sand mold capable of collecting the mold green sand not thermally affected by molten metal and the mold green sand thermally affected by the molten metal adhering to a casting material separately from each other by collapsing the poured green sand mold, wherein the cast green sand mold to be carried in is surrounded airtight at a collapsed position, and the surrounded green sand mold is decompressed and collapsed to separate the casting material having the thermally affected mold green sand adhering thereto from the mold green sand not thermally affected and the casting material is vibrated at a position other than the collapsed position to separate the thermally affected mold green sand from the casting material, whereby the thermally affected mold green sand and the mold green sand not affected thermally can be collected separately from each other.

Description

TECHNICAL FIELD The technical field to which the present invention pertains

The present invention relates to a method and an apparatus for easily disintegrating a green sand mold to separate a raw material and green sand, and more particularly to a method and an apparatus for separating and collecting green sand according to a heat history from a green sand mold. About.

Conventional technology

Conventionally, the circulation of mold molding, pouring, and mold release, ie, collapse, removal of raw materials, and collection and reuse of green sand, as shown in Fig. 1, was performed by a mold molding machine. Molding is performed, a core is inserted into the mold, and pouring is performed. After the solid material is solidified, the solid material is separated and the solid material is removed. There, the green sand mold collapses due to drop impact, rotating drum vibration, and mechanical external force, and all separated green sand is sent to one device for processing. For example, in the system disclosed in Japanese Patent Publication No. 25757-13, the heat-affected portion is separated from the non-heat-affected portion, and each portion is processed by another method. It does not disclose any method for systematically separating and recovering primary green sand from heat-affected sand. Problems to be solved by the invention

With the conventional collapse method, there is no method to separate the green sand accurately and easily. Especially in recent high hardness and high strength green molds, it is necessary to apply a larger external force, so that damage to the mold material cannot be avoided. In addition, it was difficult to separate and collect green sand with a clear history, separately from those affected by heat and those not affected by heat, and to minimize the amount of green sand taken out to the treatment process.

Means for solving the problem

Accordingly, it is an object of the present invention to provide a method for easily and accurately disintegrating green sand which has not been affected by heat without damaging a raw material.

Another object of the present invention is to perform a systematic circulation treatment of green sand, thereby separately collecting green sand not affected by heat and green sand affected by heat attached to a botanical material, The goal is to minimize the amount of green sand that can be removed.

In order to achieve the above object, a green sand mold collapse method according to one aspect of the present invention is to airtightly surround the green sand mold after completion of the filling, and to reduce the pressure of the airtightly surrounded green sand mold. Thus, it consists of disintegrating the unheated part of the raw sand type II. A method for disintegrating green sand mold according to another aspect of the present invention is to airtightly surround the green sand mold after the completion of the filling, and to decompress the green sand mold that is airtightly enclosed to reduce the green sand mold. This method separates the green sand mold from the raw material, releases the airtight enclosed green sand mold, and then removes the raw material.

According to still another aspect of the present invention, there is provided a method for separating a raw material, wherein the green sand mold which has been filled is hermetically surrounded, and the green sand mold which is hermetically surrounded to increase the boiling point of water is provided. Pressurizing the airtightly enclosed green sand mold to decompress the green sand mold to separate the green sand mold from the animal material; It consists of removing the gunshot material after releasing the 銪 type.

According to a further aspect of the present invention, the method of separating and removing the raw material material is as follows. The green sand mold after the completion of the loading is carried one by one to the collapse position, and the green sand mold after the completion of the loading is airtightly sealed. By enclosing the airtightly enclosed green sand mold and decompressing the hot sand by boiling the water in a high temperature state, vibrating the collapsed green sand mold and the raw material. Separating the green sand mold from the raw material.

According to a further aspect of the present invention, in the apparatus for removing a raw material, a vertically movable platform 5 having a vibration generator 5A, which is provided at a collapsed position, is fixed and a tiltable tray 3 is mounted. This is a disintegration / separation means for separating the green sand collapsed by weak vibrations, including the plate 2, which can be lifted and lowered to communicate with the vacuum source 6 via an on-off valve 7 provided above the mold mounting table 5. Includes a disintegration / separation means equipped with a closed box 8 and a take-out fork 15 with a vibration generator 15 A provided on one side of the collapse means so as to be able to move up and down and vibrate. Separation means for separating the mold sand.

According to another further aspect of the present invention, a green sand recovery method according to the present invention hermetically surrounds green sand after completion of loading, which is carried in at a collapse position, and is heat-affected by green heat unaffected by heat. Surrounded green sand to separate the raw material attached to the green sand In order to separate the green sand affected by heat from the raw material, the raw material is vibrated at a position different from the collapse position to separate the raw sand affected by the heat from the raw material. It consists of collecting the unaffected green sand separately.

According to another aspect of the present invention, there is provided a green sand recovery apparatus including a first collapse / separation station, a vertically movable 錡 -type mounting table 5 having a vibration generator 5 A, and a tiltable tray 3. Disintegration / separation means for separating green sand collapsed by weak vibrations, including the plate 2 to be attached, and communicating with the vacuum source 6 via an on-off valve 7 provided above the 鎵 -type mounting table 5 First collapse / separation means equipped with a closed box 8 that can be raised and lowered and a first recovery shutter 12 that recovers green sand that has not been affected by heat. A take-out fork 15 having a vibration generator 15A for separating green sand from the sand, and a second separation means including a second recovery strip 13 for recovering the green sand affected by heat.

BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a block diagram showing a conventional green sand recovery process.

FIG. 2 is a longitudinal sectional view showing a schematic configuration of the first embodiment of the present invention.

FIG. 3 is a partially sectional front view showing a second embodiment of the present invention.

FIG. 4 is an operation explanatory view of a main part of FIG.

FIG. 5 is an operation explanatory view of a main part of FIG.

FIG. 6 is a partially sectional front view showing a third embodiment of the present invention.

FIG. 7 and FIG. 7a are explanatory diagrams of the operation of the main part of FIG. FIG. 7b is an operation explanatory view of a main part of FIG.

Embodiment of the Invention

In general, a layer in which a large amount of moisture collects at a higher temperature than other parts due to the heat of the biological material, that is, a so-called moisture condensed layer with low strength, is formed around the main type of biological material. According to the present invention, the airtightly enclosed green sand mold immediately after being injected is rapidly sucked and decompressed, so that the boiling point of the water is lowered, so that the water in the high-temperature state boils. This is based on the fact that the raw material and the green sand mold are easily collapsed and separated. Immediately after pouring refers to the point in time when the molten metal solidifies and the water in the water condensed layer is heated by the heat of the raw material to a high temperature state and boils. In addition, the degree of decompression performed in an airtight state It refers to lowering the boiling point of the body's water to bring it to a boil, thereby reducing the water condensation layer to a negative pressure level that can easily collapse.

Also, when pressurizing the airtightly poured poured sand, the boiling point of water rises to 10 o ° c or more, so that water of 10 o ° c or more is generated, resulting in strength. A weak moisture condensation layer is formed. After that, the boiling point of water is lowered by rapidly reducing the pressure of the air-filled green sand mold that has been poured and the hot water is boiled, and the green sand mold is easily broken down. It is desirable that the pressure of the freshly sealed sand mold is reduced to below atmospheric pressure rather than to atmospheric pressure. Further, in the present invention, the poured green sand mold refers to a mold without a frame, and refers to a mold in which a frame is separated from a mold with a frame immediately after molding or a mold without a frame immediately after molding.

Hereinafter, a first embodiment of the green sand recovery device of the present invention will be described in detail with reference to FIG. A lifting cylinder 1 having a mounting plate 2 fixed to the top of the piston rod 1A is installed at the lower center, that is, at the first collapse separation station where the novel collapse separation of the present invention is performed. On the upper part of the mounting plate 2, a tray 3 to which a T-shaped 錡 -shaped mounting table 5 is fixed at the center of the upper part is mounted so as to be tiltable around the connecting pin 4.銪 The pedestal 5 has multiple concave rows formed by a large number of I-beams 5A spaced in parallel in the front-rear direction, and generates various vibrations with vertical, horizontal, diagonal, and rotational movements. A vibration generator 5B is provided with a first sand chute or hopper 12 and a first conveyor 12C for guiding the raw sand that has collapsed and separated and falls.

Above the 鎵 -type mounting table 5, a decompression device including an inverted U-shaped closed box 8 communicating with a vacuum source 6 via an on-off valve 7 and a seal 9 provided around a bottom opening of the closed box 8 is installed.

On one side of the collapse separation station, there is a blanking machine 16, a 押出 -shaped extruded plate 10 and a 鎵 -shaped transfer plate 11, and a green sand 铸 -type transfer for loading green sand 銪 into the first collapse separation station. A station is located. The hot-sanded green sand type M with {frame F} on the frame plate 14 fixed to the top of the rod by the lifting cylinder 13 is pushed up through the frame removal machine 16 to be framed. The unframed green sand mold M is extruded onto the mold placing table 5 via the mold extruding plate 11 by the mold extruding plate 10 attached to the reciprocating cylinder (not shown) rod. . On the other side of the collapse / separation station, a second separation / collection station consisting of a vertically movable 取 -shaped take-out fork member 15 and a vibration generator 15A that generates vibrations with up, down, left, right, diagonal and rotational movements is installed. A second chute or hopper 25 and a second conveyor 25 C are provided for separating and collecting the green sand affected by the heat of the molten metal attached around the mold material W.

Hereinafter, the operation of the first embodiment shown in FIG. 2 will be described in detail. In the green sand type M loading station, the unframed green sand type M is pushed up to the type die plate 11 at the same level as the type placing table 5 and is passed through the die plate 11. It is carried into the gun-type mounting table 5 by the 押出 -type extrusion plate 10.

At the first collapse separation station, after the 銪 -shaped extrusion plate 10 is retracted, 生 fresh sand 搬 M carried on the 載 -mounting table 5 上面, the upper surface of the tray 3 comes into contact with the inverted U-shaped closed box 8 Until it is lifted up by the lifting cylinder, and housed in an airtight chamber defined by the tray upper surface and the closed box 8. In this housed state, the on-off valve 7 is opened, the vacuum source 6 is communicated with the airtight chamber, and the pressure in the airtight chamber is rapidly reduced. As a result, a large amount of high-temperature water with a reduced boiling point existing in the water condensed layer adjacent to the raw material W boils, and the green sand M Is collapsed. After the collapse, the on-off valve 7 is closed, the air supply valve (not shown) is opened and the airtight chamber is returned to the atmospheric pressure, and then the collapsed fresh sand type M and 錶The mold carrier 5 is lowered together with the mold material W to the position shown in FIG. Simultaneously with the lowering, the vibration generator 5B is activated, and the green sand whose weak vibration has collapsed through the 錡 -mount 5 and the green sand that has not been affected by heat is added to the 錶 -type material W and separated from the 銪 -type material W. Is done. Weak vibration refers to, for example, vibration that is distinguished by the magnitude of the acceleration and amplitude and is sufficient to separate the collapsed green sand from the area around the W-shaped material W. At the collapse separation position after the mold material W is taken out, the tray 3 is rotated and tilted counterclockwise about the connecting pin 4 so that the raw sand on the tray 3 and the mold mount 5 is sand chute. That is, it is collected in the conveyor 12 C via the hopper 12, so that the D-shaped materials W can be taken out one by one without being in contact with other members and sent to the next process. To be.

At the second separation / recovery station, the take-out fork member 15 is inserted into the concave space of the 鍊 -type mounting table 5, and is slightly raised and retracted so as to scoop up the 素材 -form material W. Material W is moved to another second separation and collection position. Simultaneously with the movement, the vibration generator 15 A is actuated, and strong vibration is applied to the mold material W through the take-out fork member 15, and the green sand affected by the heat is separated from the periphery of the mold material W, and a chute, ie, Then, they are collected by the second conveyor 25C through the hopper 25 and sent to the next step in order. Strong vibration refers to, for example, vibration that is distinguished by the magnitude of the acceleration and amplitude and is sufficient to separate the green sand H attached to the 錡 -shaped material W after collapse.

In the embodiment of the present invention, the separated green sand and the green sand H attached to the green material W are separated from each other at different positions. May be done in 5 positions. In this case, after the collapsed green sand is separated by weak vibration, the green sand H attached to the mold material W is separated by strong vibration or the collapsed green sand and Any method can be adopted in which both the green mold sand H attached to the mold material W is simultaneously separated by strong vibration.

In addition, the process of separating the green sand from the mold material W by applying vibration on the mold mounting table 5 is performed after the airtight chamber is returned to the atmospheric pressure, but in a state where the airtight chamber is depressurized. May go.

In addition, if it is difficult to attach the vibration generator 5B to the 載 -type mounting table 5, the vibration generator 15A attached to the take-out fork member 15 is used only for the vibration generator 15A in the first and second stages. It may correspond to a separation step of green sand.

It should be noted that the poured unframed green sand mold M may be either the one that has been poured after removing from the frame for mold making or the one that has been extracted from the frame for mold making after pouring.

Further, the 押出 -shaped extruded plate 10 used to carry the green sand mold M to the collapse position can be replaced with the same one as the take-out fork member 15 used to take out the raw material W.

In addition, since the splint portion of the core may fall, it is desirable that the splint portion is collected by a screen or the like provided in a process after the second conveyor 25C. Regarding the second embodiment, the same components as those of the first embodiment will be described below using the same reference numerals. In the second embodiment, a scratching means 16 for scratching the surface of the green sand M-shaped M which triggers the collapse is additionally provided, and a 錶 -shaped holding structure different from the 銪 -shaped mounting table 5 of the first embodiment is used. Can be Configuration and operation other than the above of the present invention See the first embodiment.

The details of the newly provided scratching means and the box-shaped tray 20 which replaces the 錶 -type mounting table 5 will be described in detail below.

As shown in FIGS. 3, 4, and 5, a number of vertical projecting members 22 that vertically scratch the vertical mold so as to pass through the frame 21 and the upper and lower members that pass through the frame 23 Damage means comprising a number of lateral projection members 24 for laterally scratching the green mold is provided above a frame removing device 16 for extracting the upper and lower green sand M from the upper and lower frames F.

Further, a box-shaped tray 20 is mounted on the upper part of the mounting plate 2 instead of the T-shaped 錶 -shaped mounting table 5 of the first embodiment so as to be tiltable around the connecting pin 4. In the box-shaped tray 20, a plurality of band members 17 extending in the left-right direction are mounted so as to be able to move up and down by the cylinder 1, and a plurality of rod members 19 are erected.

Hereinafter, the operation of the above-mentioned damaging means and the box-shaped tray will be described.

The green sand 錡 M is extracted from the upper and lower frames F through the frame removing device 16 by the cylinder 13 and passes through the inside of the frame 21 of the scratching means 1. The surface is vertically scratched by the vertical projection member 22. Next, the green sand 鎵 M is extruded toward the box-shaped tray 20 by the 錶 -shaped extruding plate 10 and passes through the inside of the frame 23 of the scratching means. The surface of the surface is laterally scratched by the lateral projection member 24. The raw sand type M that has been damaged vertically and horizontally by passing through the frames 21 and 23 of the scratching means is supported on a plurality of strips 17 and rods 19 in a box-shaped tray 20, After the strip 17 is lowered by the cylinder 1, the green sand M is placed on the tip of the rod 19. Thereafter, the raw sand type M is lifted by the lifting cylinder until the tray 20 comes into contact with the inverted U-shaped closed box 8 for collapse separation in the next step.

The third embodiment of the present invention will be described in detail below. In the third embodiment, in addition to the depressurizing means for depressurizing the inverted U-shaped closed box 8 of the first embodiment, a pressing means for pressurizing the same is further used. Refer to the first embodiment for the configuration and operation other than the pressurizing means of the same embodiment.

Hereinafter, the pressurizing and depressurizing means of the third embodiment will be described with reference to FIGS. The closed box 8 contains a pressurized hand consisting of an on-off valve 31, a conduit 32 and a compressed air source 33. Step 30 is connected in communication with the enclosure. As shown in Figure 7a, after the green sand 錶 M placed on the 銪 -type mounting table 5 is stored in an airtight room limited by a tray and a closed box 8, the on-off valve 31 is opened. When the compressed air source 33 is communicated with the airtight chamber, the water condensing layer 34, which is weaker than the other parts, is pressurized to raise the boiling point of the water in the same layer, causing the condensed layer and raw sand. Moisture having a temperature of 100 ° C. or higher is generated over the entire mold M. Next, the on-off valve 31 is closed to stop the supply of the compressed air into the airtight chamber, and the on-off valve 7 is opened to rapidly reduce the pressure in the airtight chamber. Is brought to below 100 ° C and boiled. As a result, the raw sand type M collapses and separates from the raw material as shown in Fig. 7b. Thereafter, the on-off valve 7 may be closed and the atmospheric pressure return valve (not shown) provided in the closed box 8 may be opened to return the airtight chamber to atmospheric pressure.

In the third embodiment, the airtight chamber defined by the tray and the closed box 8 is depressurized to the atmospheric pressure or less after being pressurized. However, after the pressurization, the atmospheric pressure return valve is opened to open the airtight chamber. The air pressure may be returned to the atmospheric pressure.

The invention's effect

As is apparent from the above description, according to the method and the apparatus for recovering sand from the collapse of the raw sand mold according to the present invention, the green sand not affected by the heat of the molten metal and the heat affected by the molten metal By collecting the green sand separately and clearly grasping the production history, management of the raw material and sand treatment becomes easy, and various effects such as burnt of bentonite, maintenance of the quality of the green sand, and saving of additives. There is.

Claims

Scope of Claim A method for disintegrating green sand

After the filling is completed, the green sand mold is airtightly surrounded,

A green sand type collapse method comprising decompressing a portion of the green sand type that is not heat-affected by the hot sand type by reducing the pressure of the green sand type airtightly surrounded. 2. The method of claim 1, wherein the step of collapsing further comprises pressurizing the hermetically enclosed green sand mold before depressurizing the green sand mold.

The method of claim 1, further comprising scratching a surface of the green sand mold prior to airtightly surrounding the green sand mold after the completion of the setting.

A device for disintegrating green sand

Means for hermetically surrounding the green sand mold after completion of the filling;

Means for decompressing the green sand mold enclosed in an airtight manner. A method of separating animal material from green sand mold,

The green sand mold after the completion of the filling is airtightly surrounded, and the green sand mold surrounded in an airtight manner is reduced in pressure and the green sand mold is collapsed to thereby convert the green sand mold from the raw material. Separation,

A method for separating a raw material, comprising removing the raw material after releasing the green sand mold airtightly surrounded.

6. The method of claim 5, further comprising damaging the surface of the green sand mold prior to hermetically surrounding the green sand mold after the loading is completed.

6. The method of claim 5, wherein the collapsing step further comprises pressurizing the hermetically enclosed green sand mold before depressurizing the hermetically enclosed green sand mold.

8. The method of claim 7, wherein the step of depressurizing the hermetically surrounded green sand mold comprises reducing the pressure of the hermetically surrounded green sand mold to or below atmospheric pressure.

6. The method according to claim 5, wherein the green sand mold after completion of the loading is a green sand mold without a frame. 10. The method according to claim 9, wherein the green sand without the frame is separated from the green sand with the frame when the loading is completed.

(1) The green sand mold without a frame is in a state without a frame at the time of completion of the setting. 9 ways.

2. The method according to any one of claims 9 to 11, wherein the green sand without frame after completion of the setting is half-split.

3 A device that separates animal material from green sand

Means for hermetically surrounding the green sand mold after the filling is completed,

Suction means for depressurizing the green sand mold airtightly surrounded,

Means for separating and extracting the raw material from the raw sand mold collapsed after the decompression state is released.

4. The apparatus of claim 13, further comprising means for scratching the surface of the green sand mold after the completion of the loading.

5. The apparatus of claim 13, further comprising means for pressurizing the green sand mold that is hermetically enclosed.

6 This is a method of removing animal material from green sand mold,

After the loading is completed, the green sand molds are carried one by one to the collapse position,

Airtightly surrounds the green sand mold after completion of loading

Depressurizing the airtightly enclosed green sand mold to boil the water in a high temperature state to collapse the green sand mold,

A method for separating and removing a raw material, comprising separating the raw sand mold from the raw material by vibrating the collapsed raw sand mold and the raw material. 7 The step of vibrating the green sand and the green material separates the collapsed green sand from the raw material by applying a weak vibration at the airtight surrounding position, and then the airtight surrounding position. The method according to claim 16, wherein the green sand is separated from the animal material by applying a strong vibration at a different position from the animal material.

8. The green sand mold after completion of the filling is a green sand mold without a frame.

One of the seven ways one.

9. The method according to claim 18, wherein the green sand mold without a frame is extracted from the mold frame after pouring.

0 The method according to claim 18, wherein the green sand mold without the frame is extracted from the mold frame before pouring. 1 This is a device for removing animal material from green sand

昇 -type lifting platform with vibration generator 5 A installed at 崩壊 -type collapse position

5 is a disintegration / separation means for separating raw sand collapsed by weak vibrations, including a plate 2 to which a tiltable tray 3 is attached while being fixed, and which is provided above the 铸 -type mounting table 5. Collapse / separation means provided with a vertically movable closed box 8 communicating with a vacuum source 6 via an on-off valve 7;

A material material comprising: a take-out fork 15 having a vibration generator 15 A provided on one side of the collapse means so as to be able to move up and down and vibrate freely; and a separating means for separating the green sand from the material material by strong vibration. Take-out device.

(2) The 錡 -type carrying means including the 铸 -type extruding plate 10 and the 渡し -type transferring plate 11 provided on the other side of the disintegrating / separating means for carrying the green sand mold on the 銪 -type placing table 5 is further provided. 22. The apparatus of claim 21, comprising:

(3) The frame-type carrying-in means further includes a frame-forming machine (16) including a frame-shaped frame (14) for frame-forming the green sand type (2), which is provided on the outside of the metal-type transfer plate (11) so as to be vertically movable. Item 2 2-4 This is a method for recovering green sand from green sand after completion of charging.

In order to airtightly surround the green sand after completion of loading, which is carried in at the collapse position, and to separate the raw material to which the green sand is attached from the green sand that has not been affected by heat. Decompressing and collapsing the surrounded green sand 錡 type,

Vibrating the raw material at a position different from the collapse position to separate the green sand affected by the heat from the raw material;

A green sand recovery method comprising separately collecting the green sand affected by the heat and the green sand not affected by the heat.

5. The method according to claim 24, wherein the green sand mold after completion of the filling is in a state without a frame. 6 A device for recovering green sand from green sand

1st collapse ・ Collapse due to weak vibration, including a plate 2 on which a free-standing 錶 -type mounting table 5 having a vibration generator 5 A and having a vibration generator 5 A is fixed and a tiltable tray 3 is attached. Disintegration means for separating the produced green sand, wherein the vacuum source 6 is connected to a vacuum source 6 A first collapse / separation means including a communicating vertically movable closed box 8 and a first recovery shot 12 for recovering green sand unaffected by heat;

Vibration generator 15 provided at the second separation and recovery station, which separates green sand from animal material by strong vibrations 15 Take-out fork with 15 A and 2nd recovery shot 1 for recovering green sand affected by heat 3. A green sand recovery device comprising: