JP3441065B2 - Mold molding method and molding apparatus - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molding method and a molding apparatus for molding a mold for molding and pouring with a flask. In particular, the present invention relates to a molding method and a molding apparatus in which a casting frame is carried in from a pass line, sand-filled, compressed, separated, and carried out to the pass line.

[0002]

2. Description of the Related Art Conventionally, in a mold making facility for making a mold for molding and pouring with a molding flask, it is known that filling and compression of the molding flask are performed at spatially separated stations (for example, , JP-A-3-35842). In this mold making equipment, the filling of the flask and the compression of other flasks can be performed at the same time, so the production efficiency of the equipment is correspondingly increased. However, in this mold making equipment, each casting frame is sent upward from the supply path by the model plate holder arranged in the transfer device, reaches the filling station while entraining the filling auxiliary frame, descends after filling, and is transferred. It is necessary for the device to be sent under the compaction device, then ascended into the device and compressed. Therefore, a filling station and a compression station are required, and time and energy are required for the flask to move between both stations. In addition, it is necessary to provide a large number of actuators, which makes the device complicated and extremely expensive. Further, in the compression process, a space was required below and a pit had to be dug deep in order to secure an operating stroke of an actuator for compression. Therefore, construction time such as pit construction and installation time were long. Further, the model board carry-in / out apparatus has an actuator for compression attached thereto, which complicates the model board carry-in / out apparatus.

[0003]

The present invention has been made in view of the above problems. The object of the present invention relating to the molding method is to reduce the movement of the molding flask as much as possible to shorten the molding time cycle and energy consumption in a method of molding a mold for molding and pouring in a state with a molding flask. It is to provide a molding method for reducing the number. Another object of the present invention relating to a molding apparatus is to provide a molding apparatus for carrying out this molding method, and also to provide a molding apparatus having a simple structure and a short construction and installation time. Furthermore, the present invention provides such a molding method,
The purpose is to improve the quality of the mold.

[0004]

In order to achieve the above-mentioned object, a molding method according to the present invention comprises a step in which each flask moving along a pass line reaches a filling compression station, and the casting frame is filled and compressed. A process of forming a sand filling space with a model plate carrier and a model plate that are arranged in the transfer device so that they can be transferred only in a horizontal plane by a filling and compressing device that descends in the station and the upper filling frame; -Filling with the molding sand by the option, the filling and compressing device further descends, and the molding sand is compressed, and the filling and compressing device, the sand mold with a frame formed by the raising of the upper frame is the model plate carrier and the model plate. and a step to be separated, see contains a step of further filling compressor and the upper Sheng frame with caged sand molds is carried out to the pass line reaches to the original position increases, the at least Eare - Shi
Part or all from before start to after end of sand filling
Or casting for longer time with auxiliary aeration
It is characterized by fluidizing the sand . According to the present invention relating to the molding method, there is no movement of the flask in the left and right spaces between the filling station and the compression station, the molding time cycle is shortened, and the energy consumption is reduced. Further, the present invention relating to a molding apparatus is a mold molding apparatus for molding the above-described mold, wherein the filling and compressing apparatus is a molding sand supply means, a lid member, and a plurality of penetrating the lid member. A squeeze foot, and a mounting frame fixedly suspended from the foundry sand supply means, a roller mounted on the inner surface of the lower end of the mounting frame for loading and unloading the flask, and a horizontal surface. And a model plate carrier arranged in the transfer device so as to be transferable only inside. According to the present invention relating to the molding apparatus, the number of actuators is reduced, the structure is simple, and the construction and installation time is shortened. Further, in the molding method according to claims 2 to 4 , the quality of the mold can be improved in such a molding method.

Here, in the present invention, the method of molding a mold for molding and pouring with a molding frame means a general molding with a frame or the like. Further, the pass line means a passage through which the flask is transferred.

[0006] The filling compression station is a station in which the filling and compression functions are performed in the same machine space. The filling in the present invention is filling by aeration. The air leaching can be more uniformly filled by fluidizing the molding sand by the auxiliary air ration. here,
Filling by air ration means low pressure air flow (eg, 0.05 to 0.18 MPa, more preferably 0.0 to 0.18 MPa).
(5 to 0.10 MPa) is applied over the molding sand and filled. To achieve this, low pressure air flow (0.05-0.18M) from at least the lower perimeter of the sand hopper.
The air of Pa) is jetted to fluidize the foundry sand, and then a low-pressure air stream is applied from the upper part of the foundry sand. So-called blowing can be done more slowly than using air with a pressure of 0.2 MPa to 0.5 MPa, and complex model parts (especially elongated pocket parts) can be filled with sand, noise and model plates Wear can be reduced. The compression in the present invention includes compression by squeeze. The filling and compressing device means a device capable of filling and compressing. What is the top frame?
It is a molding auxiliary frame. Note that a bottom frame may be used as appropriate. Further, by controlling the amount of air exhaustion from the vent of the upper frame, the filling of the molding sand can be improved. That is, in the step of compressing the foundry sand, after reaching the set compression force, the set compression force is maintained for a certain period of time and the air in the mold is discharged, whereby a good quality mold can be produced. By preventing the negative pressure from being generated at the time of mold release, the mold is not chipped and it is effective to secure good mold release property.

The model plate carrier which is arranged in the transfer device so that it can be transferred only in the horizontal plane is a carrier on which the model plate is placed, and is movable in the horizontal plane in the transfer device. The transfer device is, for example, a rotary table or a reciprocating mechanism. The transfer device exchanges the model board.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 shows an outline of the vicinity of a molding apparatus on a mold molding line. 1 (a) is a front view and FIG. 1 (b) is a side view. In FIG. 1, the flask F is a pass line 1
The process of molding, pouring, and disintegrating is cycled through by moving above. Then, at the position of the mold making apparatus 2, the filling compression station 3 is reached. Filling compression station
In the section 3, a filling and compressing device 4 capable of moving up and down is provided. Further, a model plate carrier 6 is provided in the transfer device 5 so that it can be transferred only in a horizontal plane. After the molding, the framed sand mold 7 is carried out to the pass line 1 and moved to the pouring process by a pouring device (not shown).

In FIG. 1 and FIG. 2, a model plate 11 having a model 11A attached thereto is placed and arranged on a model plate carrier 6, and two types (upper mold and lower mold) of the model plates 11 are alternately arranged. It is designed to be loaded and unloaded at the location. Further, the model plate 11 has a plurality of model holes 11A and vent holes (not shown) penetrating vertically. In addition, in FIG.
An embodiment using is shown.

In FIG. 2, above the position where the model plate 11 is carried in, a sand shoe 14 having a sand inlet 13 opened and closed by a slide gate 12 is provided at the upper end, and the upper portion is provided. A switching valve 15 for a compressed air source not shown in FIG.
A sand filling cylinder 19 provided with a supply pipe 16 communicating with each other via a main body cylinder 20 and 20 and a lid member 18 having two left and right sand discharge ports 17 and 17 at its lower end are provided. It is arranged. This constitutes a molding sand supply means. Attaching frames 21, 21 are suspended from the filling and compressing device 4 below the left and right ends of the lid member 18 of the sand filling cylinder 19, and casting frames are formed on the inner surfaces of the lower ends of the attaching frames 21, 21. Rollers 22, 22 for loading and unloading the frame F are attached so as to face each other, and the casting frame F is positioned above the model plate 11 so as to correspond thereto.

A description will be given below with reference to FIGS. 3, 4, and 5.
An upper filling frame 23 corresponding to the casting frame F is hung at the lower part of the sand filling cylinder 19 so as to be able to be controlled up and down by frame cylinders 24, 24, and the inner portion thereof is supplied and exhausted with compressed air. A plurality of squeeze feet 25, 25 that can be controlled to stop moving up and down are suspended. That is, in FIG. 3, compressed air is supplied to the first air holes 25A and 25A and air is exhausted from the second air holes 25B and 25B to lower the squeeze feet 25 and 25 (the squeeze foot in the central portion of FIG. 3). ), And conversely the second air hole 25
Compressed air is supplied to B and 25B and the first air-hole 2
Squeeze foot 25, 25 can be raised (left squeeze foot in FIG. 3) by exhausting air from 5A, 25A.
It is also configured so that 5, 25 can be stopped at the descending intermediate position. The squeeze feet 25, 25 may be attached to the tip of a general air cylinder.

Further, the sand discharge ports 17 and 1 of the lid member 18 are
7, the sand filling nozzles 26, 26 are positioned between the squeeze feet 25, 25 such that the lower end surfaces of the sand filling nozzles 26, 26 are at the same level as the lower end surfaces when the squeeze feet 25, 25 are raised to the rising end position. The sand filling nozzles 26, 26 are open below the blow ports. An aeration mechanism is provided slightly above the blow port, as shown in FIG. The air-raising mechanism is provided with left and right sand outlets 1 provided inside the sand filling cylinder 19.
Compressed air ejecting means for ejecting compressed air from the left and right multi-hole plates 17A, 17A toward the tapered portion communicating with 7, 17, and exhaust control means for controlling exhaust from the upper filling frame 23 into the filling frame by selection. It is composed of

Further, as shown in FIG. 5, the lower portion of the sand filling cylinder 19 is sized so that it can be vertically inserted into the opening of the upper filling frame 23 and the plurality of squeeze feet 25, 25.
The lid member 18 is fixed to the sand filling nozzles 26, 26 so that the sand filling nozzles 26, 26 can move up and down relatively. In the figure, reference symbol S is foundry sand. Further, vent holes 23A and 23A are provided at positions on the upper side of the upper frame 23 so as to discharge air ratio air.

In the thus constructed apparatus, in FIG. 1, the flask F moves on the pass line 1 and reaches the filling and compression station 3 in the mold making apparatus 2. Further, the model plate carrier 6 and the model plate 11 supporting the model 11A to be molded are transferred in advance in the horizontal plane in the transfer device 5 and stopped at the position shown in FIG. Then, in FIG. 2, the main body cylinders 20 and 20 are operated in a state where the frame cylinders 24 and 24 are operated and the upper frame 23 is aligned with the upper portion of the casting frame F to operate the sand filling cylinder 19 and the mounting frame 21. , 21 etc. are lowered to set the casting frame F on the lower filling frame FA. Next, the plurality of squeeze feet 25, 25 are operated to form the whole in a concavo-convex shape which is made to face the concavo-convex shape of the lower surface of the model plate 11 (see FIG. 3) and inserted into the upper opening of the upper frame 23. Accordingly, the sand filling space is defined by the model plate 11, the casting frame F, the upper filling frame 23, the squeeze feet 25, 25, the lid member 27, etc., and the state shown in FIG. 6 is obtained. As a result, the molding frame F and the model plate 11 are arranged in the transfer device so that the casting frame F can be transferred only in the horizontal plane by the filling and compressing device 4 and the upper filling frame 23 that descend in the filling and compression station. Together they form a sand filling space.

Next, the switching valve 15 is switched to supply compressed air from the supply pipe 16 into the sand filling cylinder 19 so that the sand filling nozzle 2
The casting sand S is blown and filled into the sand filling space through the nozzles 6 and 26 as shown in FIG. The compressed air blown into the sand-filled space together with the foundry sand S has a plurality of vent holes (not shown) of the model plate 11 and the vent 2 provided in the upper frame 23.
It is exhausted through 3A and the like. As a result, the molding sand S blown and filled has a lower surface corresponding to the uneven shape of the model plate 11 and an upper surface corresponding to the uneven shape formed by the plurality of squeeze feet 25, 25.

Next, after the frame cylinders 24, 24 are set in the free state, the main body cylinders 20, 20 are further operated by a pressure higher than the control pressure of the squeeze feet 25, 25, and the sand filling cylinder 19 and the mounting frame are attached. Move down 21, 21, etc.

After releasing the lower filling frame FA, the sand filling cylinder 19 and the mounting frames 21, 21 and the like are further lowered from the upper part, and the squeeze foot 25, 25 compresses the foundry sand S while squeezing the sand. It continues until 25 and 25 reach the rising end. As a result, the upper surface of the foundry sand S is flattened by the lower surfaces of the squeeze feet 25, 25 as shown in FIG. 8 and compressed according to the sand thickness (height) in the casting frame F and the fill frame 23. As a result, uniform compression is achieved as a whole.

Next, the main body cylinders 20 and 20 are reversely operated and the lower filling frame FA, the sand filling cylinder 19 and the mounting frames 21 and 21 are arranged.
Flask F made by molding a sand mold by raising the temperature
After the (sand mold with frame 7) is separated from the upper frame 23, the roller 2
It is scooped up by 2 and 22 and the die with the model board 11 is removed. During this time, the sand filling cylinder 19 is replenished with the foundry sand S and brought into the state of FIG.

Next, the framed sand mold 7 is carried out, the next empty molding frame F on the pass line 1 is carried in, and the model plate 1 is also carried out.
1 is also carried out together with the model board carrier 6 and replaced with the next model board 11 and carried in. The above operation is repeated thereafter.

In the embodiment of the invention described above, when the casting sand S is filled with aeration, the molding sand is fluidized rather than blow-filled. can do. If the air pressure is 0.05 MPa to 0.10 MPa, the air consumption can be further reduced as compared with the conventional case.

In the embodiment of the present invention, the squeeze foot is driven by air, but it may be driven by hydraulic pressure or electric power.

Further, in the embodiment of the present invention, the filling and compressing device is constructed so as to be vertically movable by two main body cylinders which also function as a molding machine column. In this case, since the main body cylinder is configured to face upward and the transfer device for the model plate carrier is configured by the rotary table, the molding machine can be made compact.

The filling / compressing device may be vertically movable by means of four body cylinders or two cylinders which also function as a molding machine column or two cylinders and two guides. In this case, it is suitable for a relatively large mold.

When the lower filling frame is used, the lower filling frame is restrained up to the middle of the squeeze, and then the restraint of the lower filling frame is released, so that the compression of the mold surface becomes more preferable.

[0026]

As is apparent from the above description, the present invention relating to the molding method includes a step in which each casting frame moving on the pass line reaches the filling compression station, and the casting frame is filled with the compression station. The step of forming a sand filling space with the model plate carrier and the model plate that are arranged in the transfer device so that they can be transferred only in the horizontal plane by the filling and compressing device and the upper filling frame that descend in After filling with the molding sand, the filling and compressing device is further lowered, and the molding sand is compressed, and the sand mold with a frame molded by the filling and compressing device and the raising of the upper frame is separated from the model plate carrier and the model plate. that step and, viewed including the steps of further filling compressor and the upper Sheng frame with caged sand molds is carried out to the pass line reaches to the original position increases, the at least Eare - Deployment of sand filling
From the beginning to the end, part or all or it
Fluidization of foundry sand by auxiliary aeration in the above time
It is so arranged that the consumption can be reduced energy while shortening the molding cycle time. Further, in the present invention related to a molding apparatus, the filling and compressing apparatus is a molding sand supply means,
An attachment frame including a lid member and a plurality of squeeze feet penetrating the lid member, further fixed to the foundry sand supply means and attached to a lower inner surface of the attachment frame. Since it includes a roller for loading and unloading the flask and a model plate carrier arranged in the transfer device so that it can be transferred only in a horizontal plane, it is possible to provide a molding device having a simple structure and a short installation time, etc. Its effect on the industry is enormous. As an additional effect, there is an effect that the die is improved.

[Brief description of drawings]

FIG. 1 is a diagram showing an outline of the vicinity of a molding device of a mold molding line of the present invention.

FIG. 2 is a vertical cross-sectional front view showing the molding apparatus of the present invention.

FIG. 3 is a vertical sectional front view showing an aeration mechanism.

FIG. 4 is an enlarged view of a lower portion of the sand filling cylinder.

FIG. 5 is a bottom view of FIG.

FIG. 6 is a vertical cross-sectional front view showing the configuration in a state where the sand filling space is defined.

FIG. 7 is a vertical cross-sectional front view showing the configuration of the sand filling state.

FIG. 8 is a vertical cross-sectional front view showing a configuration in a pre-compression state.

FIG. 9 is a vertical cross-sectional front view showing the configuration of the molding sand compressed state by the squeeze foot.

[Explanation of symbols]

1 pass line 2 Mold making equipment 3 Filling compression station 4 Filling compression device 5 Transfer device 6 Model board carrier 11 model board 17 Sand outlet 18 Lid member 19 sand filling cylinder 21 Mounting frame 22 Roller 23 Top frame 25 squeeze foot 26 sand filling nozzle 26A Blow mouth 27 Lid member F flask S Foundry sand

Continuation of the front page (56) Reference JP-A-55-122651 (JP, A) JP-A-60-158949 (JP, A) JP-A-2-290648 (JP, A) Actual development Sho-49-110 (JP , U) (58) Fields investigated (Int.Cl. ⁷ , DB name) B22C 5/00-25/00

Claims (8)

(57) [Claims] 1. A method for molding a mold in which molding and pouring are performed with a molding frame, wherein each molding frame moving along a pass line reaches a filling compression station, and the molding frame comprises: A step of forming a sand filling space together with a model plate carrier and a model plate that are arranged in the transfer device so that they can be transferred only in a horizontal plane by a filling compression device that descends in the filling compression station and an upper filling frame; After being filled with molding sand by air ratio, the filling and compressing device is further lowered to compress the molding sand, and the filling and compressing device and the sand mold with a frame molded by the raising of the upper frame are model plate carriers and viewed contains a step which is separated from the pattern plate, a step of further filling compressor and the upper Sheng frame with caged sand molds is carried out to the pass line reaches to the original position increases, the at least Eare - Deployment
There is a part or all between before the sand filling and after the sand filling.
Or longer than that, casting sand by auxiliary aeration
A method for making a mold , which comprises fluidizing the mold. 2. The method for making a mold according to claim 1 , wherein the exhaust of the air ratio air from the upper frame is controlled. 3. A process of molding sand is compressed, after reaching the set compression force, claim from claim 1, characterized in that for discharging the air in the mold by maintaining a constant time set compression force 2 The method for producing a mold according to claim 1. 4. A method for molding a mold in which molding and pouring are performed with a molding frame, wherein each molding frame moving along the pass line reaches a filling compression station, and the molding frame comprises: A step of forming a sand filling space together with a model plate carrier and a model plate that are arranged in the transfer device so that they can be transferred only in a horizontal plane by a filling compression device that descends in the filling compression station and an upper filling frame; After being filled with molding sand by air ratio, the filling and compressing device is further lowered to compress the molding sand, and the filling and compressing device and the sand mold with a frame molded by the raising of the upper frame are model plate carriers and A step of compressing the molding sand, including a step of separating from the model plate, and a step of discharging the framed sand mold to the pass line and further raising the filling compression device and the upper filling frame to reach the original position. At the set compression force The method for molding a mold is characterized in that, after reaching the temperature, the set compression force is maintained for a certain period of time to discharge the air in the mold. 5. A mold molding device for molding the mold according to any one of claims 1 to 4, wherein the filling and compressing device is a molding sand supply means, a lid member, A mounting frame including a plurality of squeeze feet penetrating the lid member, further fixed to and suspended from the casting sand supply means, and a casting frame mounted on the inner surface of the lower end of the mounting frame and carried in. A molding apparatus comprising: a roller to be taken out and a model plate carrier arranged in the transfer apparatus so as to be transferable only in a horizontal plane. 6. The molding apparatus according to claim 5, wherein the transfer device for the model plate carrier is configured as a rotary table. 7. The molding apparatus according to claim 5, wherein the transfer device of the model plate carrier is configured as a reciprocating mechanism. 8. The molding apparatus according to claim 6, wherein the filling and compressing apparatus is configured to be vertically movable by two main body cylinders that also function as a molding machine column.