JP2001129641A - Mold molding method and molding apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and apparatus for molding a mold for performing molding and pouring in a state with a flask, which can reduce energy consumption and have a short cycle time. A transfer device that enables each casting frame moving on a pass line to reach a filling compression station, and that can be transferred only in a horizontal plane by a filling compression device and a filling frame that descend at the filling compression station. A step of forming a sand filling space together with the model plate carrier and the model plate disposed in the inside, a step of further lowering the filling and compressing device after the filling with the molding sand to compress the molding sand, a filling and compressing device and a filling frame The sand mold with the frame formed by the rise of the mold is separated from the model plate carrier and the model plate, and the sand mold with the frame is carried out to the pass line, and the filling compression device and the filling frame are further raised to the original position. Reaching.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art Conventionally, it is known that, in a mold making apparatus for making a mold for performing molding and pouring with a flask, a filling and a compression of the flask are performed at spatially separated stations (for example, for example). And JP-A-3-35842). In this mold making facility, the filling of the flask and the compression of the other flask can be performed simultaneously, so that the production efficiency of the facility is correspondingly high. 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. A process is required in which the device sends it under the tamping device, then ascends into the device and is compressed. For this reason, a filling station and a compression station are required, and time and energy for moving the flask between the two stations are required. In addition, it is necessary to provide a large number of actuators, which complicates the apparatus and makes the apparatus extremely expensive. Further, in the compression step, a space is required below to secure an operation stroke of the actuator for compression, and it is necessary to dig a pit deep. Therefore, the construction time and installation time of the pit construction and the like have been long. Further, the model plate carrying-in / out device is provided with an actuator for compression, and the model plate carrying-in / out device is complicated.

[0003]

The present invention has been made in view of the above problems. An object of the present invention relating to a molding method is to provide a method of molding a mold for performing molding and pouring in a state with a flask, in which the movement of the flask is reduced as much as possible to shorten the molding time cycle and reduce energy consumption. An object of the present invention is to provide a molding method for reducing the amount of molding. Further, an object of the present invention relating to a molding apparatus is to provide a molding apparatus for performing the molding method, and to provide a molding apparatus having a simple structure and a short construction and installation time. A further object of the present invention is to improve the quality of the mold in such a molding method.

[0004]

In order to achieve the above object, a molding method according to the present invention comprises: a step in which each flask moving on a pass line reaches a filling compression station; A step of forming a sand filling space together with a model plate carrier and a model plate arranged in the transfer device so as to be transportable only in a horizontal plane by the filling compression device and the filling frame descending at the compression station; After filling with sand, the filling and compressing device is further lowered to compress the molding sand, and the filling and compressing device and the step of separating the framed sand mold formed by raising the filling frame from the model plate carrier and the model plate. And a step in which the framed sand mold is carried out to the pass line and the filling / compressing device and the filling frame are further raised to reach the original position. ADVANTAGE OF THE INVENTION According to this invention which concerns on a shaping | molding method, there is no movement of the casting flask of a left-right space between a filling station and a compression station, a shaping | molding time cycle is shortened, and energy consumption is reduced. The present invention according to a molding apparatus is a mold molding apparatus for molding the mold described above, wherein the filling and compressing apparatus includes a molding sand supply unit, a lid member, and a plurality of pieces penetrating the lid member. A squeeze foot, further comprising: a mounting frame fixedly suspended from the foundry sand supply means; a roller mounted on an inner surface at a lower end of the mounting frame for carrying in and out the casting frame; And a model plate carrier that is disposed in the transfer device so as to be transferable only within the device. ADVANTAGE OF THE INVENTION According to this invention regarding a shaping apparatus, the number of actuators is reduced, a structure is simple, and construction and installation time are short. Furthermore, in the molding method according to claims 3 and 6, the quality of the mold can be improved in such a molding method.

[0005] In the present invention, the method of molding a mold for performing molding and pouring in a state with a flask includes a normal molding with a frame. The pass line refers to a passage through which the flask is transferred.

[0006] A filling compression station is a station in which the filling and compression functions take place in the same machine space. Filling in the present invention includes filling by free fall and blowing.
There is filling by wings. In the case of blowing, more uniform filling can be achieved by fluidizing the molding sand with an auxiliary blow. The compression in the present invention includes compression by air flow and compression by squeeze. A filling compression device refers to a device capable of filling and compression. The filling frame is a molding auxiliary frame. Further, in the step of compressing the molding sand, after reaching the set compression force, the air in the mold is discharged while maintaining the set compression force for a certain period of time, so that a good quality mold can be formed.

[0007] The model plate carrier placed in the transfer device so as to be transferable only in the horizontal plane is a carrier on which the model plate is placed, and is movable in the transfer device in the horizontal plane. The transfer device refers to, for example, a rotary table or a reciprocating mechanism. In this transfer device, the model plates are exchanged.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows an outline of the vicinity of a molding apparatus of a mold molding line. FIG. 1A shows a front view, and FIG. 1B shows a side view.
In FIG. 1, a flask F is moved on a pass line 1 to circulate the molding, pouring and balancing processes. Then, at the position of the mold making apparatus 2, it reaches the filling compression station 3. The filling / compression station 3 is provided with a filling / compressing device 4 which can be moved up and down. Further, a model plate carrier 6 is provided in the transfer device 5 so as to be transferable only in a horizontal plane. After molding, the framed sand mold 7 is carried out to the pass line 1 and moved to a pouring step by a pouring device (not shown).

In FIGS. 1 and 2, a model plate 11 having a model 11A mounted thereon is placed and placed on a model plate carrier 6, and two types (upper die and lower die) of the model plate 11 are alternately shown in FIG. At the location. The model plate 11 is provided with a model 11A and a plurality of vent holes (not shown) penetrating vertically.

In FIG. 2, above the position where the model plate 11 is carried in, there is provided a sand shoe 14 provided with a sand inlet 13 which is opened and closed by a slide gate 12 at an upper end, and an upper part. To the compressed air source (not shown)
A sand blow-in tube 19 provided with a supply pipe 16 communicating with the bottom plate and a bottom plate cover 18 having a plurality of sand discharge ports 17, 17 at the lower end thereof can be controlled up and down through main body cylinders 20, 20. It is arranged. Thus, a casting sand supply unit is configured. The bottom plate cover of the sand blowing cylinder 19
Mounting frames 21, 21 are fixedly suspended from the lower left and right ends of 18, and rollers 22, 22, which carry in and out the casting frame F, are provided on the inner surfaces of the lower ends of the mounting frames 21, 21. The casting frame F is mounted so as to face the upper surface of the model plate 11.

A description will be given below with reference to FIGS. 3, 4 and 5.
At the lower part of the sand blowing tube 19, a filling frame 23 corresponding to the casting frame F is suspended by being controlled up and down by frame cylinders 24 and 24, and the inside thereof is supplied and discharged by compressed air. A plurality of squeeze feet 25, 25 capable of lifting / lowering stop control are suspended. That is, in FIG. 3, the squeeze feet 25, 25 are lowered by supplying compressed air to the first air holes 25A, 25A and exhausting air from the second air holes 25B, 25B (the squeeze foot in the center of FIG. 3). ), And conversely, the second air hole 25
B, 25B and the first air hole 2
Squeeze feet 25, 25 are raised by exhausting air from 5A, 25A (squeeze feet on left and right sides in FIG. 3)
The squeeze feet 25, 25 can be stopped at the lower intermediate position.

Further, the sand discharge port 1 of the bottom plate cover 18 is provided.
The sand blowing nozzles 26, 26 communicating with the squeezing feet 25, 26 are positioned at the same level as the lower end faces when the squeeze feet 25, 25 are raised to the raised end position. 25 positions (squeeze foot 2
5 and 25), and the blow ports 26A and 26A of the sand blowing nozzles 26 and 26 are arranged as shown in FIG.
As shown in the figure, the sand blowing nozzles 26 are provided on the lower side surfaces of the nozzles. As shown in FIGS. 4 and 5, the lower part of the sand blowing cylinder 19 is sized to be inserted into the opening of the filling frame 23 so as to be vertically movable, and the plurality of squeeze feet 25, 25 and the sand blowing nozzle are provided. The cover member 27 is formed by penetrating the cover cylinder 26 so as to be able to move up and down relatively.
8 and 28, the lid member 27 is lowered so that the sand blowing nozzle 2 is lifted.
Blower ports 26A, 26A opening at lower side surfaces of 6, 26
It is configured to block.

Further, an air supply pipe 30, which communicates with a compressed air source (not shown) via switching valves 29, 29, at a position above the raised frame 23 in the bottom plate cover 18,
30 is communicated, the communication supply port is closed when the filling frame 23 is raised, and is opened when the filling frame 23 is lowered. In addition, the code | symbol S in a figure is casting sand.

In such a construction, 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 in FIG. Further, the model plate carrier 6 and the model plate 11 supporting the model 11A to be molded are transferred in advance in a horizontal plane in the transfer device 5 and stopped at the position shown in FIG. 2, the main body cylinders 20, 20 are operated in a state where the frame cylinders 24, 24 are operated to align the filling frame 23 with the upper part of the casting frame F, and the sand blowing cylinder 19 and the mounting frame 21 are operated. , 21 and the like are lowered to set the frame F on the model plate 11. Next, the plurality of squeeze feet 25, 25 are actuated to form the entire uneven shape corresponding to the upper surface uneven shape of the model plate 11 below (see FIG. 3) and inserted into the upper opening of the filling frame 23, Thus, a sand filling space is defined by the model plate 11, the casting frame F, the filling frame 23, the squeeze feet 25, 25, the cover member 27, and the like, and the state shown in FIG. 6 is obtained. As a result, the casting frame F is moved down at the filling and compression station and the filling compression device and the filling frame 2 are moved downward.
3 together with the model plate carrier 6 and the model plate 11 arranged in the transfer device so as to be transferable only in the horizontal plane, form a sand filling space.

Next, the switching valve 15 is switched to supply compressed air from the supply pipe 16 into the sand blow-in tube 19, and the molding sand S is discharged through the sand blow-in nozzles 26, 26 as shown in FIG. Blow-fill the filling space. The compressed air blown into the sand filling space together with the casting sand S is exhausted through a plurality of vent holes (not shown) of the model plate 11 and the air supply pipes 30, 30 and the like. The casting sand S blow-filled thereby
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, the cover cylinders 28, 28 are operated to lower the cover member 27, and the blow-off ports 26A, 26A of the sand blowing nozzles 26, 26 are closed to prevent the backflow of the compressed air. 29, 29 are switched to supply pipes 30, 30
, The compressed air is supplied to the upper portion of the molding sand S in the filling frame 13 through the gap between the filling frame 23 and the lid member 27. As a result, the compressed air flows through the molding sand S from above to below and the model plate 1
1 exhausted from a vent hole (not shown)
The whole is uniformly pre-compressed from above (pre-compression by air pressure), and the upper surface of the molding sand S is slightly lowered from the lower surfaces of the squeeze feet 25, 25 as shown in FIG.

Next, after the frame cylinders 24, 24 are brought into a free state, the main body cylinders 20, 20 are further actuated by a pressure higher than the control pressure of the squeeze feet 25, 25, so that the sand blowing cylinder 19 and the mounting frame. The squeeze feet 25, 25 are further lowered, and the molding sand S is compressed by the squeeze feet 25, 25 while the squeeze feet 25, 25 continue until the squeeze feet 25, 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. 9, and is compressed according to the sand thickness (height) in the casting frame F and the filling frame 23. This results in uniform compression as a whole.

Next, the main body cylinders 20 and 20 are operated in reverse to raise the sand blowing cylinder 19 and the mounting frames 21 and 21, thereby forming a sand mold F (a sand mold 7 with a frame). After being separated from the filling frame 23, it is scooped up by the rollers 22, 22, and the mold plate 11 is removed from the mold. During this time, the sand blowing cylinder 19 is supplied with the casting sand S, and the state is returned to the state shown in FIG.

Next, the framed sand mold 7 is unloaded, the next empty casting frame F on the pass line 1 is loaded, and the model plate 1 is removed.
1 is also carried out together with the model plate carrier 6 and replaced with the next model plate 11 and carried in. Hereinafter, the above operation is repeatedly performed.

In the above embodiment, the compressed air is allowed to flow through the molding sand S between the blowing and filling of the molding sand S and the compression of the molding sand S by the squeeze feet 25, 25 (pre-compression). However, a mechanism capable of performing a pre-compression by impact pressurization that acts on the upper part of the molding sand S filled with compressed air while impact is applied. In this case, the vent hole can be selectively provided.

Further, when the surface shape of the model plate 11 is not so complicated (the unevenness is low), a molding method and an apparatus mechanism in which preliminary compression is omitted may be used.

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

[0023]

As is apparent from the above description, the present invention according to the molding method includes a step in which each flask moving on the pass line reaches the filling compression station, and a step in which the flask is filled with the compression station. A step of forming a sand filling space together with a model plate carrier and a model plate arranged in the transfer device so as to be able to be transferred only in a horizontal plane by a filling compression device and a filling frame descending at, and after the casting frame is filled with molding sand. The filling / compressing device is further lowered, and the molding sand is compressed; the filling / compressing device and the frame-formed sand mold formed by raising the filling frame are separated from the model plate carrier and the model plate; A process in which the sand mold is carried out to the pass line and the filling / compressing device and the filling frame are further raised to the original position, so that the molding time cycle can be shortened and energy consumption can be reduced. . Further, the present invention according to the molding apparatus,
The filling and compressing device includes a casting sand supply unit, a lid member, and a plurality of squeeze feet penetrating the lid member,
Further, a mounting frame fixedly suspended from the molding sand supply means, a roller mounted on an inner side surface at a lower end of the mounting frame for carrying in and out a casting frame, and a transporter capable of transporting only in a horizontal plane. Since it includes a model plate carrier disposed in the apparatus, the effect on the industry is remarkable, such as providing a molding apparatus having a simple structure and a short installation time.

[Brief description of the drawings]

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

FIG. 2 is a longitudinal sectional front view showing a molding apparatus of the present invention.

FIG. 3 is a vertical sectional front view of the squeeze foot group.

FIG. 4 is an enlarged view of a lower portion of the sand injection tube.

FIG. 5 is a sectional view taken along the line AA in FIG. 4;

FIG. 6 is a longitudinal sectional front view showing a configuration in which a sand filling space is defined.

FIG. 7 is a vertical cross-sectional front view showing a configuration in a sand blowing and filling state.

FIG. 8 is a longitudinal sectional front view showing a configuration in a pre-compressed state.

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pass line 2 Mold making apparatus 3 Filling compression station 4 Filling compression apparatus 5 Transfer device 6 Model plate carrier 11 Model plate 17 Sand discharge port 18 Bottom plate cover 19 Sand blowing cylinder 21 Mounting frame 22 Roller 23 Filling frame 25 Squeeze foot 26 Sand blowing nozzle 26A Blow port 27 Lid F Molding frame S Molding sand

Claims (9)

[Claims] 1. A method of molding a mold for performing molding and pouring in a state with a flask, wherein each flask moving on a pass line reaches a filling compression station; A step of forming a sand filling space together with a model plate carrier and a model plate arranged in the transfer device so as to be transferable only in a horizontal plane by the filling compression device and the filling frame descending at the filling compression station; After filling with the molding sand, the filling compression device further descends, and the molding sand is compressed,
The step of separating the sand mold with the frame formed by raising the filling compression device and the filling frame from the model plate carrier and the model plate, and the sand molding device with the frame is carried out to the pass line, and the filling compression device and the filling frame are further installed. Ascending to an in-situ position. 2. The method according to claim 1, wherein the filling is performed by blowing. 3. The method according to claim 2, wherein the molding sand is fluidized by the auxiliary blow at least from before the start to after the end of the blowing. 4. Prior to the compression step by the filling compression apparatus,
The method according to any one of claims 1 to 3, further comprising a step of performing pre-compression by air pressure. 5. The method according to claim 4, wherein air is discharged from an air vent of the model plate at least at the time of preliminary compression by air pressure. 6. The method according to claim 1, wherein in the step of compressing the molding sand, after reaching the set compressive force, the set compressive force is maintained for a predetermined time to discharge the air in the mold. The molding method of a mold according to any one of claims 1 to 4. 7. A mold molding apparatus for molding a mold according to any one of claims 1 to 6, wherein the filling and compressing apparatus includes a molding sand supply means, a lid member, And a plurality of squeeze feet penetrating the lid member. The mounting frame is fixedly suspended from the molding sand supply means. A molding apparatus comprising: a roller to be ejected; and a model plate carrier arranged in the transfer device so as to be transferable only in a horizontal plane. 8. A rotary table for transferring a model plate carrier.
The molding apparatus according to claim 7, wherein the molding apparatus is configured as a cable. 9. The molding apparatus according to claim 7, wherein the transfer device for the model plate carrier is configured as a reciprocating mechanism.