JP2005334976A - Method for molding mold and molding apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a molding method in which the molding cycle is shortened by minimizing the transfer of a molding frame and energy consumption is reduced. <P>SOLUTION: The method for molding a mold for performing the molding and molten metal pouring while the molding frame is attached, comprises the following processes: a process in which each molding frame transfers on a pass-line and reaches a filling and compressing station; a process in which a sand-filling space is formed with a pattern plate carrier arranged in a transfer device so as to be transferable only in the horizontal plane and a pattern plate by a filling and compressing device and piled flask falling in the filling and compressing station; a process in which after the space is filled with free dropping molding sand, the molding sand is compressed by means of downward movement of the filling and compressing station; a process in which the sand mold with frames formed by the rise of the filling and compressing device and the piled flask is separated from the pattern plate carrier and the pattern plate; and a process in which the sand mold with frames is carried out to the path-line and further, the filling and compressing device and the piled flask are raised to reach the original position. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method and a molding apparatus for molding a mold for performing molding and pouring with a cast frame. In particular, the present invention relates to a molding method and a molding apparatus for a mold in which a cast frame is carried in from a pass line, compressed after sand filling, separated, and carried out to the pass line.

  Conventionally, in a mold making facility that molds a mold for casting and pouring in a state with a cast frame, it is known to perform sand filling and compression of the cast frame at spatially separated stations (for example, Patent Document 1). reference). In this mold making facility, the sand filling of the casting frame and the compression of the other casting frame can be performed simultaneously, so that the production efficiency of the facility is correspondingly increased.

JP-A-3-35842 (pages 1 and 2 and FIG. 1)

  However, in this mold making facility, 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 step is required in which the device is sent under the tamping device and then ascending into the device and compressed.

  For this reason, a filling station and a compression station are required, and the time and energy required for the casting frame to move between both 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 process, a space is required below to secure an operation stroke of the compression actuator, and it is necessary to dig deep into the pits. Therefore, it takes a long time for construction such as pit construction and installation time.

  Furthermore, the model board carry-in / out apparatus is provided with an actuator for compression, which complicates the model board carry-in / out apparatus.

  Therefore, 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 shorten the molding time cycle by reducing the movement of the casting frame as much as possible in the method of molding a mold that performs molding and pouring in a state with a casting frame, and consumes energy. An object of the present invention is to provide a molding method for reducing the number of moldings.

  Furthermore, an object of the present invention is to improve the quality of the mold in such a molding method.

  Another object of the present invention related to a molding apparatus is to provide a molding apparatus for carrying out this molding method, and to provide a molding apparatus with a simple structure and a short construction and installation time.

  The mold molding method of the present invention is a method of molding a mold for casting and pouring in a state with a cast frame, wherein each cast frame moving on a pass line reaches a filling and 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 a filling compression device and a filling frame descending in the filling and compression station; After filling by free fall of foundry sand, the filling and compressing device is further lowered, the foundry sand is compressed, and the sand mold with frame formed by raising the filling and compressing device and filling frame is a model plate carrier and model. And a step of separating from the plate and a step of unloading the sand mold with the frame to the pass line and raising the filling and compressing device and the filling frame to reach the original position.

  In the present invention, the method of forming a mold that performs molding and pouring in a state with a cast frame refers to a normal method of forming with a frame. Further, the pass line refers to a passage through which the casting frame is transferred.

  The filling and compression station refers to a station in which filling and compression functions are performed in the same machine space. The compression in the present invention includes compression by air flow and compression by squeeze.

  Moreover, a filling compression apparatus means the apparatus which can be filled and compressed. The fill frame is a molding auxiliary frame.

  Moreover, it is preferable to include the step of pre-compressing by air pressure before the compression step by the filling compression device.

  Moreover, it is preferable that the step of pre-compressing with air pressure is a step of pre-compressing with air pressure by impact pressurization that impacts the upper part of the filled casting sand.

  Moreover, it is preferable that the step of pre-compressing with air pressure is a step of pre-compressing by flowing air pressurizing so that the foundry sand flows uniformly from above to make the entire foundry sand uniform.

  Further, it is preferable to discharge air from the air vent of the model plate at least during preliminary compression by air pressure.

  Further, in the step of compressing the foundry sand, it is preferable to discharge the air in the mold while maintaining the set compression force for a certain time after reaching the set compression force.

  Further, the molding apparatus of the present invention is a mold molding apparatus for molding a mold by the above-described method, wherein the filling and compression apparatus includes a casting sand supply means, a lid member, and a plurality of squeeze penetrating through the lid member. A mechanism for precompressing by air pressure, a mounting frame fixedly suspended from the foundry sand supply means, and a roller attached to the lower inner surface of the mounting frame to carry the casting frame in and out. And a model plate carrier disposed in the transfer device so as to be transportable only in a horizontal plane.

  The model plate carrier disposed in the transfer device so as to be transportable 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 refers to, for example, a rotary table or a reciprocating motion mechanism. With this transfer device, the model plate is exchanged.

  According to the present invention, since there is no movement of the left and right cast frames between filling and compression, the molding time cycle can be shortened and the energy consumption can be reduced. Also, in the process of pre-compressing with air pressure or in the process of compressing the foundry sand, after reaching the set compression force, hold the set compression force for a certain time and discharge the air in the mold, so that a good quality mold Can be molded.

  Furthermore, 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 can be shortened.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows an outline of the vicinity of a molding apparatus on a mold making line. FIG. 1A shows a front view, and FIG. 1B shows a side view. In FIG. 1, the casting frame F moves on the pass line 1 and circulates through the steps of molding, pouring, and breaking. The casting frame F reaches the filling and compression station 3 at the position of the mold making apparatus 2. The filling and compression station 3 is provided with a filling and compression device 4 that can be raised and lowered. 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 molding, the framed sand mold 7 is carried out to the pass line 1 and moved to a pouring process by a pouring device (not shown).

  In FIG. 1 and FIG. 2, a model plate 11 with a model 11A attached at the top is placed and placed on a model plate carrier 6, and two types (upper mold and lower mold) of model boards 11 are alternately placed at the positions shown in FIG. It comes in and out. The model plate 11 has a plurality of models 11A and a plurality of vent holes (not shown) penetrating vertically.

  In FIG. 2, a sand chute 14 provided with a sand inlet 13 that is opened and closed by a slide gate 12 at the upper end is provided above the position where the model board 11 is carried in, and a compressed air source ( (Not shown) is provided with a supply pipe 16 communicating via a switching valve 15 and a sand blowing cylinder 19 provided with a bottom plate cover 18 having a plurality of sand discharge ports 17, 17 formed at the lower end thereof is a main body cylinder 20. 20 is arranged to be controlled up and down via 20. This constitutes a foundry sand supply means. Mounting frames 21 and 21 are fixedly suspended at the lower left and right ends of the bottom plate cover 18 of the sand blowing cylinder 19, and a roller 22 that carries the casting frame F in and out of the lower inner surfaces of the mounting frames 21 and 21. 22 are opposed to each other, and the casting frame F is disposed above the model plate 11.

  Hereinafter, description will be made with reference to FIGS. 3, 4 and 5. A filling frame 23 corresponding to the casting frame F is suspended below the sand blowing cylinder 19 so as to be controlled up and down by frame cylinders 24 and 24, and compressed air is supplied and exhausted on the inner side thereof. Thus, a plurality of squeeze feet 25 that can be controlled to be lifted and stopped are suspended. That is, in FIG. 3, while supplying compressed air to the first air holes 25A and 25A and exhausting air from the second air holes 25B and 25B, the squeeze feet 25 and 25 are lowered (the central portion in FIG. 3). On the contrary, while supplying compressed air to the second air holes 25B and 25B and exhausting air from the first air holes 25A and 25A, the squeeze feet 25 and 25 are raised (left and right in FIG. 3). The squeeze foot 25 can be stopped at the lowering intermediate position.

  Further, the sand blowing nozzle 26 communicates with the sand discharge port 17 of the bottom plate cover 18 and the squeeze nozzle 26 is squeezed so that the lower end surface thereof is at the same level as the lower end surface when the squeeze foot 25 is raised to the raised end position. The blow port 26A of the sand blowing nozzle 26 is disposed between the feet 25 and 25 (position surrounded by the squeeze feet 25, 25). An opening is provided on the lower side surface. Further, at the lower part of the sand blowing cylinder 19, as shown in FIGS. 4 and 5, the squeeze foot 25 and the sand blowing nozzles are sized so as to be inserted into and raised from the opening of the filling frame 23. A lid member 27 penetrating 26 so as to be movable up and down is suspended by lid cylinders 28 and 28 so as to be lifted and lowered. Further, the lid member 27 is configured to close the blow port 26 </ b> A that opens on the lower end side surface of the sand blowing nozzle 26 by being lowered.

  Further, air supply pipes 30, 30 communicating with a compressed air source (not shown) via switching valves 29, 29 are communicated with the upper portion of the raised frame 23 in the bottom plate cover 18. When the frame 23 is raised, the communication supply port is closed, and when the filling frame 23 is lowered, the communication supply port is opened. In addition, the code | symbol S in FIG. 2 is foundry sand.

  In FIG. 1, the casting frame 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 a horizontal plane in the transfer device 5 and stopped at the position shown in FIG. In FIG. 2, the frame cylinders 24, 24 are actuated to lower the mounting frames 21, 21, etc. in a state where the filling frame 23 is aligned with the upper part of the casting frame F, and the casting frame F is framed on the model plate 11. Set and fill with foundry sand by free fall of foundry sand.

  Next, the plurality of squeeze feet 25, 25 are operated to form the whole in an uneven shape relative to the upper surface uneven shape of the model plate 11 below (see FIG. 3) and inserted into the upper opening of the fill frame 23, Therefore, the sand filling space is defined by the model plate 11, the casting frame F, the filling frame 23, the squeeze feet 25 and 25, the lid member 27, etc., and the state shown in FIG. 6 is obtained.

  As a result, the mold frame F is sand-filled together with the model plate carrier 6 and the model plate 11 arranged in the transfer device so as to be transportable only in a horizontal plane by the filling compression device 4 and the filling frame 23 descending in the filling and compression station. Create a space.

  Next, the switching valve 15 is switched to supply compressed air from the supply pipe 16 into the sand blowing cylinder 19 and the sand sand S is passed through the sand blowing nozzles 26 and 26 into the sand filling space as shown in FIG. Blow-fill. The compressed air blown into the sand filling space together with the foundry sand S is exhausted through a plurality of vent holes (not shown) of the model plate 11 and the supply pipes 30 and 30.

  Next, the lid cylinders 28 and 28 are operated to lower the lid member 27 and block the blow ports 26A and 26A of the sand blowing nozzles 26 and 26 to prevent the backflow of the compressed air, and then the switching valves 29 and 29 are turned on. The air supply pipes 30 and 30 are switched to supply compressed air to the upper part of the foundry sand S in the filling frame 13 through a gap between the filling frame 23 and the lid member 27. As a result, the compressed air flows through the foundry sand S downward from above and is exhausted from a vent hole (not shown) of the model plate 11, and the entire foundry sand S is uniformly pre-compressed from above (pre-compressed by flowing air pressurization). As shown in FIG. 8, the upper surface of the foundry sand S is slightly lowered from the lower surfaces of the squeeze feet 25, 25.

  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, and the sand blowing cylinder 19, the mounting frames 21, 21 and the like. The squeeze feet 25 and 25 are continued to be lowered while the molding sand S is compressed by the squeeze feet 25 and 25. 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 the compression according to the sand thickness (height) in the cast frame F and the fill frame 23 is performed. And uniform compression is achieved as a whole.

  Next, the main body cylinders 20, 20 reversely operate to raise the sand blowing cylinder 19 and the mounting frames 21, 21, thereby forming the casting frame F (sand casting mold 7 with frame) into the filling frame 23. And separated from the model plate 11 by the rollers 22 and 22. In the meantime, the sand blowing cylinder 19 is replenished with the foundry sand S to be brought into the state shown in FIG.

  Next, the sand mold 7 with the frame is carried out, the next empty casting frame F on the pass line 1 is carried in, and the model plate 11 is also carried out together with the model plate carrier 6 to be replaced with the next model plate 11. It is brought in. Thereafter, the above operation is repeated.

  In the above-described embodiment, between the filling of the foundry sand S and the compression of the foundry sand S by the squeeze feet 25, 25, the compressed air is caused to flow through the foundry sand S and pre-compressed (pre-compressed by flowing air pressurization). However, it may be a mechanism capable of pre-compression by impact pressurization that impacts the upper part of the foundry sand S filled with compressed air. 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 hydraulically or electrically.

It is a figure which shows the outline | summary of the molding apparatus vicinity of the mold making line of this invention. It is a longitudinal cross-sectional front view which shows a molding apparatus. It is a longitudinal cross-sectional front view of a squeeze foot group. It is an enlarged view of the lower part of a sand blowing cylinder. It is AA arrow sectional drawing in FIG. It is a longitudinal cross-sectional front view which shows the structure of the state which defined the sand filling space. It is a longitudinal cross-sectional front view which shows the structure of the sand blowing filling state. It is a longitudinal cross-sectional front view which shows the structure of a preliminary compression state. It is a longitudinal cross-sectional front view which shows the structure of the molding sand compression 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 apparatus 6 Model board carrier 11 Model board 17 Sand discharge port 18 Bottom board cover 19 Sand blowing cylinder 21 Mounting frame 22 Roller 23 Filling frame 25 Squeeze foot 27 Cover member F Cast frame S Foundry sand

Claims (9)

A method of forming a mold for casting and pouring in a state with a cast frame, each casting frame moving through a pass line reaching a filling and compression station,
Forming a sand filling space together with a model plate carrier and a model plate arranged in the transfer device so that the cast frame can be transferred only in a horizontal plane by a filling compression device and a filling frame descending at the filling and compression station;
After the casting frame is filled by free fall of the foundry sand, the filling and compressing device is further lowered, and the foundry sand is compressed,
A step of separating a sand mold with a frame formed by raising a filling compression device and a filling frame from a model plate carrier and a model plate;
And a step of unloading the sand mold with the frame to the pass line and raising the filling and compressing device and the filling frame to reach the original position. 2. The mold making method according to claim 1, further comprising a step of pre-compressing with air pressure before the compressing step with the filling and compressing device. 3. The mold making method according to claim 2, wherein the step of pre-compressing with air pressure is a step of pre-compressing with air pressure by impact pressurizing to act on the top of the filled casting sand. 3. The mold making method according to claim 2, wherein the step of pre-compressing with air pressure is a step of pre-compressing by flowing air pressurization that causes casting sand to flow downward from above to make the entire casting sand uniform. 5. The mold making method according to claim 2, 3 or 4, wherein air is discharged from an air vent of the model plate at least during precompression by air pressure. 6. The process of compressing the foundry sand, wherein 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. Mold making method. 7. A molding apparatus for molding a mold by the method according to claim 1, 2, 3, 4, 5, or 6, wherein the filling and compression apparatus penetrates the foundry sand supply means, a lid member, and the lid member. Including a plurality of squeeze feet, a pneumatic pre-compression mechanism, a mounting frame fixedly suspended from the foundry sand supply means, and a casting frame mounted on the inner surface of the lower end of the mounting frame. A molding apparatus, comprising: a roller; and a model plate carrier disposed in the transfer device so as to be transportable only in a horizontal plane. 8. The molding apparatus according to claim 7, wherein the model plate carrier transfer device is configured as a rotary table. 8. The molding apparatus according to claim 7, wherein the transfer device for the model plate carrier is configured as a reciprocating mechanism.