KR20220112130A - Core machine sand filler - Google Patents

Abstract

Provided is a sand filling device using air to introduce casting sand into a molding space or a space. The sand filling device includes a permeable dividing plate limiting a dual wall structure with a wall of a body unit of the device. The permeable dividing plate is easily manufactured and easily injects compressed air of a desired pressure. Also, the permeable dividing plate does not require regular maintenance management. The body unit of the device acting as a pressure tank limits chambers (12, 13) by limiting the dual wall structure with the permeable dividing plate (10, 11). In the sand filling device using the air, the casting sand flows by the compressed air injected through the permeable dividing plate. So, the casting sand is introduced into the molding space. Each of the permeable dividing plates is formed of a porous resin or metal.

Description

CORE MACHINE SAND FILLER {CORE MACHINE SAND FILLER}

The present invention relates to a sand introduction device using air, and a method and apparatus for manufacturing a mold or molds using the device using air to fill a molding space or space with a molding sand. In particular, the present invention has a body portion acting as a pressure tank that is arranged in a double-wall structure of a wall of the pressure tank and a double-walled structure of a breathable porous divider defining a chamber therebetween, and the molding sand is applied to the compressed air injected through the divider. It relates to a sand introduction device fluidized by a mold and blow-filled into a molding space or space, and also to a method and apparatus for manufacturing a mold or molds using an apparatus using air to fill a molding space or space with a molding sand.

In Japanese Patent Application Laid-Open No. 2001-259795 published on September 25, 2001, the Applicant claimed that a molding space appropriately defined as needed by a pattern plate, a flask, a filling frame, and a plurality of squeeze feet. A device that can be filled with molding sand by using air was proposed. The configuration of this device is as follows. The apparatus is for filling a molding space defined by a pattern plate, a flask disposed on the pattern plate, a filling frame disposed on the flask, etc., and a lower part of the sand filling means with the sand filling means using air to fill the molding sand with the sand filling means . The sand filling means includes an upper portion arranged as a sand tank, a central portion arranged as a tapered chamber provided with a plurality of porous plates having a plurality of through-holes formed therein, and a lower portion arranged as a nozzle capable of advancing to the filling frame. . The apparatus comprises means mounted on each of the plurality of porous plates for injecting compressed air towards the interior of the tapered chamber;

and means mounted on the filling frame for controlling the exhaust of air from the frame. During operation, the squeeze foot is moved upward and downward, and the pressing surface thereof is spaced apart from the pattern portion of the pattern plate by a predetermined distance, thereby defining the modeling space. When the molding sand is blow filled, pressurized air is properly drawn from the

While injection fluidizes the molding sand in the tapered chamber, the amount of molding sand injected from the nozzle of the sand filling means is increased or decreased, and the air exhausted from the filling frame is also controlled by the means for controlling the exhaust of the air from the nozzle. While the proportion of the blown molding sand is decreased or increased, the rate of air discharged from the pattern plate is controlled so that the density of the molding sand filled in the molding space is locally controlled.

As described above, the conventional molding sand filling apparatus uses a plate in which a plurality of through-holes having a direct diameter of approximately 1 mm are formed as a porous paper plate for a sand filling means using air. However, in these porous plates; manufacturing time is long; Fluidizing the molding sand as needed using these porous plates requires relatively high air pressure, so a lot of energy is used to manufacture the mold, and the through hole is clogged after continuous use, so regular maintenance is required. There was one problem.

According to an embodiment of the present invention, there is provided a sand introducing device using air to introduce molding sand into a molding space, wherein the body of the sand introducing device comprises a wall of the body and a breathable partition plate defining a chamber therebetween. A pressure tank having a medium-wall structure is defined, and the molding sand is fluidized by compressed air injected through the breathable partition plate, and the breathable partition plate may be made of a porous resin or metal.

According to another embodiment of the present invention, the breathable partition plate may include a plate-in made of a porous hydrophobic resin or a porous non-corrosive metal.

According to another embodiment of the present invention, the partition plate is a resin plate having a thickness of 5-20 mm and a plurality of through-holes having an average diameter of 10-500 μm, and the diameter may be smaller than the particle size of the molding sand.

According to another embodiment of the present invention, the average diameter may be 10-50㎛.

According to another embodiment of the present invention, the device may have, at its lower part, a sand inlet which can be advanced into the filling frame, which serves as a part delimiting the forming space.

According to another embodiment of the present invention, there is provided a method of introducing molding sand into a molding space using air using a sand introduction device, the method comprising: defining a molding space; fluidizing the molding sand in the body by injecting compressed air into the body of the sand introducing device through the breathable partition plate of the sand introducing device; and controlling the discharge of the air from the filling frame so that the ratio of the molding sand injected from the sand inlet is increased or decreased, while controlling the rate of exhaust from the pattern plate, so that the molding space The molding sand may be introduced into the molding space, comprising the step of filling the molding sand with the molding sand, and partially adjusting the density of the molding sand filled in the molding space.

According to another embodiment of the present invention, there is provided a molding method using a sand introducing device using air, comprising: holding a match plate between an upper flask and a lower flask, disposed opposite to the openings of the flasks adjacent to the match plate defining a molding space for an upper mold and a molding space for a lower mold by inserting upper and lower squeezing means into the openings of the molded flasks; introducing the molding sand into the molding space and advancing the upper and lower squeezing means toward the match plate to press the molding sand in the molding space, thereby simultaneously producing the upper mold and the lower mold.

According to another embodiment of the present invention, the molding sand may be introduced into the molding space while inclining the molding space or after the molding space is inclined at an angle.

According to another embodiment of the present invention, there is provided a molding machine using the sand introducing device using the air according to any one of claims 1 to 4, comprising the steps of sandwiching and holding a match plate between an upper flask and a lower flask. , a molding space for an upper mold and a molding space for a lower mold by inserting an upper copesqueeze means and a lower drag squeeze means into the openings of the flasks disposed opposite to the openings of the flasks adjacent to the match plate. and advancing the upper and lower squeezing means toward the match plate to press the molding sand in the molding space for the upper and lower molds, thereby producing the upper and lower molds. And, the sand introduction device using air to introduce the molding sand into the molding space for the upper and lower molds may be inclined in a vertical plane.

According to another embodiment of the present invention, the molding machine includes a rotating frame mounted on a support shaft for vertical rotation in a vertical plane, and a pair mounted on the rotating frame, each having a sand inlet on a side wall thereof. a flask moving means for approaching or separating the flask from each other to form a molding space and removing the mold by moving the pair of flasks; A sand introducing device for introducing the molding sand into a pair of opposing flasks through an inlet, an opposing flask approaching, and a match plate held therebetween define the molding space and define the molding space, wherein the opposing flask is filled with It includes a squeeze means for pressing the molding sand, The molding sand can be introduced while tilting the molding space with respect to a vertical line.

According to another embodiment of the present invention, the molding machine includes a guide rod fixed to the rotating frame and a pair of opposing flask moving members, the pair of opposing flask moving members being fixed to the flask moving member. can

According to another embodiment of the present invention, the sand introducing device comprises a body, the body serving as a double-walled pressure tank structure of a breathable divider defining a wall of the body and a chamber therebetween, and As the molding sand in the sand introduction device is fluidized by the compressed air injected from the pressure tank structure through the breathable porous partition plate, the molding sand may be introduced into the molding space.

According to another embodiment of the present invention, the sand introducing device using air may use the above-mentioned sand introducing device.

According to another embodiment of the present invention, the sand cooker device may include means for supplying compressed air to the molding sand held in the sand introducing device from the top.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic sectional drawing which shows the principal part of the apparatus for a tight-flask casting which concerns on embodiment of this invention.
FIG. 2 is a graph showing the movement of pressure of compressed air as the molding sand is fluidized for the breathable porous divider used in the apparatus of FIG. 1 ;
Fig. 3 shows the movement of the pressure of compressed air when the molding sand is fluidized when a conventional porous plate with a plurality of through-holes is used instead of the breathable porous divider used in the apparatus of Fig. 1; It is a comparison graph with a graph.
Fig. 4 is a partial cross-sectional view schematically showing a main part of an apparatus for manufacturing a flaskless upper mold and a flaskless lower mold according to another embodiment of the present invention.
Fig. 5 is a partial front sectional view schematically showing a main part of an apparatus for manufacturing a flaskless upper mold and a flaskless lower mold according to another embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a sand introducing device using air and a method and apparatus using the sand introducing device for carrying out the present invention will be described.

Example 1

An example of a molding machine according to the present invention will be described with reference to FIGS. 1 to 3 . As shown in FIG. 1, in the molding machine, the molding sand is introduced by a sand introduction device 4 using air into the molding space defined by the flask 2 and the filling frame 3 disposed on the pattern plate 1, arranged to be charged. A plurality of squeeze feet movable upward and downward are fixed to the bottom of the sand introducing device 4 .

A plurality of vent plugs (not shown) are embedded in the pattern plate 1 , so that air is discharged by a space (no reference number) disposed at the bottom of the vent plug and the pattern plate. Further, an exhaust control means 6 for controlling the discharge of compressed air from the filling frame 3 is attached to the filling frame 3 . The emission control means (6) comprises a frame member (8) mounted on the periphery of the filling frame (3) and defining a hollow chamber (7) sealed together with the filling frame (3); an on/off valve (not shown) for opening or closing the hollow chamber 7 to the atmosphere; and a plurality of fine holes (9, 9) formed in the filling frame (3) for discharging compressed air into the hollow chamber (7).

In addition, the sand introduction device using air defines the pressure tank with the entire wall of the body and a double wall structure of two pairs of upper and lower air permeable porous dividers 10 and 11, and includes two, namely upper and lower chambers ( 12, 13), and also the body 14 defining the lower two (right and left) tapered chambers; a sand inlet 15 mounted on the lower end of the body 14 and capable of advancing to the filling frame 3; and two on/off valves 16 and 17 for communicating a compressed air source (not shown) in fluid communication with the upper and lower chambers 12 and 13, respectively. Each of the breathable porous partition plates 10 or 11 is composed of a porous resin plate having a plurality of through-holes having an average diameter of 10-500 mu m and a thickness of 5-20 mm. Each of the breathable porous dividers is attached by a sealing material. In addition, the body 14 is provided with a sand supply hole 19 that is opened or closed by a sliding gate 18 on the upper portion.

Hereinafter, a process of introducing and filling the molding sand into a given molding space using air from the step shown in FIG. 1 will be described. First, using known means, the pattern plate 1, flask 2, and the like are moved upwards and downwards, and are arranged relative to each other. Next, the filling frame 3 is moved downward and placed on the flask 2 , and the lower part of the sand introducing device using air and the squeeze feet 5 , 5 advance to the filling frame 3 . In addition, the squeeze feet 5 and 5 move upward and downward, so that their squeeze surfaces face the squeeze feet and are spaced apart from the pattern portion of the pattern plate defining the molding space by a predetermined distance.

After the sand supply hole 19 is closed by the sliding gate 18, the on/off valves 16 and 17 are opened to introduce compressed air into the chambers 12 and 13, and the breathable porous divider 10 , 11) by injecting compressed air into the body 14 of the sand introduction device 4 to fluidize the molding sand in the body 14, and simultaneously pressurize the upper surface of the molding sand by the injected air. It should be particularly noted that since the molding sand in the tapered chamber of the body 14 is fluidized, the resistance of the molding sand in the tapered chamber to the inner surface of the tapered chamber is reduced.

Further, by opening the on/off valves 16 and 17 and simultaneously, appropriately opening or closing the on/off valve of the discharge control means 6 to control the discharge of compressed air from the filling frame 3 , , the rate at which the molding sand is injected from the sand inlets 15, 15 is increased or decreased, while the rate at which air is discharged through the vent plug of the pattern plate is controlled. Accordingly, the density of the molding sand filled in the molding space can be partially controlled. Therefore, the molding sand is precisely filled as needed at all locations within the molding space.

Compressed air is supplied to the chambers 12 and 13 by opening the on/off valves 16 and 17, and when injected through the breathable porous divider 10, 11, the movement of the pressure of the compressed air according to the present invention is as shown in FIG. 2 . The movement of the compressed air pressure when the conventional divider is used is as shown in FIG. 3 .

2 and 3 , the prescribed pressure for fluidization is supplied to the chambers 12 , 13 and is injected through the breathable porous dividers 10 , 11 to compress the molding sand in the body 14 to fluidize it. It's about air. The measured pressure for fluidization is compressed air or conventionally supplied to the chambers 12 and 13 and injected into the body 14 through the breathable porous dividers 10 and 11 to fluidize the molding sand in the body 14 . for the compressed air supplied to the chamber located at the rear of the porous plate. The pressure measured in the sand tank is the pressure in the body 14 or in a conventional sand tank.

The graphs of FIGS. 2 and 3 were compared and analyzed. In the present invention, the measured pressure for fluidization is lower than when a conventional porous plate is used. Accordingly, the breathable porous partition plates 10 and 11 of the present invention can fluidize the molding sand by injecting compressed air at a lower pressure than that used for the conventional porous plate.

Although the above-mentioned Example 1 relates to the molding of an adhesive flask, the present invention is not limited thereto. It is applicable to the flaskless mold removed from the flask 2 after the molding is completed. This will be described in Example 2 below.

In addition, in the above-described embodiment 1, the breathable porous dividers 10 and 11 are porous water-quality plates, but the present invention is not limited thereto, and each plate has a plurality of through-holes smaller than the particle size of the molding sand, and is breathable and has desirable strength. It may be any kind of plate with For example, the plate may be a sintered metal plate.

Example 2

Hereinafter, a molding machine according to a second embodiment of the present invention related to flaskless molding will be described with reference to FIG. 4 .

The configuration of the molding machine according to the present embodiment may be that of a conventional molding machine for manufacturing a flaskless upper mold and a flaskless lower mold. The molding machine includes a pair of flasks, that is, an upper flask 32 and another lower flask 33 slidably mounted on a guide rod 31; a flask moving device 34 for simultaneously moving the flask between the central molding position coincident with each other and the spaced apart position from each other; a match plate 35 held between flasks 32 and 33 in the forming position; a pair of squeeze plates 36 and 37 inserted into the flask from the opposite side; Squeegee moving within the corresponding flask

squeeze plate control means (38, 39) which independently sets the shift for each of the squeeze plates (36 or 37) and independently controls the shifts of the squeeze plates (36, 37); and a sand introducing device 40 using air to fill the flasks 32 and 33 holding the match plate 35 with molding sand. The sand introducing device 40 may be similar to the sand introducing device 4 using air.

By holding the match plate 35 sandwiched between the upper flask 32 and the lower flask 33 and closing the rear openings of the flasks 32 and 33 by a pair of squeeze plates 36 and 37, , two molding spaces are defined, one for the upper mold and one for the lower mold. The guide rod 31 is fixed to the flask moving device 34 and is arranged to rotate 90° clockwise with respect to the flask moving device 34 in a vertical plane from the position shown in FIG. 4 . By this rotation, the molding space is engaged with the sand introducing device 40 through the sand inlet (not shown) formed in the flasks 32 and 33 . Accordingly, the sand introducing device 40 using air, the match plate 35 used instead of the pattern plate 1 in this embodiment, the upper and lower flasks 32 and 33, and a pair of squeeze plates ( 36, 37) can be filled with molding sand. (In Fig. 4 of this embodiment, a chamber similar to the chambers 12 and 13 of the sand introduction device 4 of Fig. 1, a breathable porous partition plate ( A divider plate similar to 10, 11, and an on/off valve similar to on/off valves 16 and 17, not shown)

As in Example 1, in Example 2, the effect of the breathable porous divider according to the present invention was confirmed.

In the molding machine arranged as described above for producing a flaskless upper mold and a flaskless lower mold, a shadedportion or shaded portion located opposite to a patterned portion or patterned portions of a match plate as viewed from a sand introduction device The problem may arise that parts may not be sufficiently filled with the molding sand. Accordingly, a molding machine according to a third embodiment of the present invention capable of filling the covered portion with a molding sand will be described below.

Example 3

5 is a partial cross-sectional view schematically showing a molding machine according to a third embodiment of the present invention for manufacturing an upper mold and a lower mold. The molding machine is similar to the molding machine shown in FIG. 4 . 5, the main part of the molding machine for manufacturing the upper mold and the lower mold according to this embodiment is mounted on a support shaft 51 extending laterally and fixed to the base (not shown) of the apparatus. a rotating frame 52 that rotates vertically in a vertical plane; A side facing cylinder 54 pivotally mounted on the base (not shown), wherein the end of the piston rod of the opposing cylinder 54 is connected to the upper portion of the rotating frame 52 through an interlocking device 53 so that it is vertical a cylinder 54 that can rotate to and vertically rotates the rotating frame 52 by its extension and contraction; two spaced apart guide rods 55 and 55 fixed to the bottom of the rotating frame 52 and extending along the bottom; A pair of opposing flask moving members ( 58, 59); an upper flask (60) and a lower flask (61) mounted on the flask moving members (58 and 59), respectively, and having a sand inlet in their side walls; squeezing means 62 and 63 mounted on the flask moving members 58 and 59, respectively, for pressing the molding sand filled in the upper flask 60 and the lower flask 61; a transferable match plate 64 disposed and held between the upper flask 60 and the lower flask 61; A sand introducing device (65) mounted to rotate vertically in a vertical plane with respect to a rotating frame (52), wherein the sand introducing device uses air to introduce molding sand into the molding space through the sand inlet of the flask (60, 61). (65); Another side cylinder (66) having a piston rod connected at its distal end to a sand introducing device (65), which rotates the sand introducing device (65) perpendicular to the rotating frame (52) by its extension and contraction The sand introducing device 65 includes a side cylinder 66 to engage and disengage with respect to the sand inlet of the flask.

In Embodiment 3, the sand introducing device 65 using air is the sand introducing device 65 of Embodiment 2

It may also be arranged as a pressure tank structure using the porous plate of the device 40 .

In the operation of the molding machine arranged as described above, the sand introducing device 65 using air is disposed opposite to the opening of the flask adjacent to the match plate 64 held in by the flask; While the molding sand is introduced into the limited molding space by inserting the squeeze means 62, 63 into the opening of 61), the flask, the match plate, the sand introducing device 65, etc. are inclined or inclined at a desired angle. Accordingly, the molding sand is easily fluidized in the obscured part of the molding space, improving the degree of the molding sand filled in the obscured part.

The above-described embodiment is merely an example, and the present invention is not limited thereto. Obviously, those skilled in the art can modify the above embodiment.

For example, in the third embodiment, the sand introducing device 65 is arranged as a pressure tank structure using the same special porous plate as the sand introducing device 40 of the second embodiment. However, instead of, or in conjunction with, the structure, the molding sand may be blow filled into the molding space using conventional blow filling methods, for example by applying compressed air from a compressed air source to the surface of the molding sand from above. have.

In Examples 2 and 3, the present invention was embodied as a molding machine for simultaneously manufacturing a flaskless upper mold and a flaskless lower mold, but the molding machine is an apparatus for separately manufacturing a flaskless upper mold and a flaskless lower mold, that is, one It may be an apparatus for manufacturing a mold of

Further, although compressed air is supplied to the chambers 12 and 13 separately by opening the on/off valves 16 and 17 in the embodiment of the present invention, the present invention is not limited to this arrangement. Chambers 12 and 13 may be combined into one chamber, such that one on/off valve 16 or 17 may be used to supply compressed air to the chamber.

Claims (14)

A sand introduction device using air to introduce molding sand into a molding space, comprising:
The body of the sand introducing device defines a pressure tank of a double wall structure of a breathable divider defining a wall of the body and a chamber therebetween,
The molding sand is fluidized by compressed air injected through the breathable divider,
The breathable partition plate is made of a porous resin or metal, sand introduction device. The method of claim 1,
wherein the breathable divider is a plate made of a porous hydrophobic resin or a porous non-corrosive metal. The method of claim 1,
The partition plate is a resin plate having a thickness of 5-20 mm and a plurality of through-holes having an average diameter of 10-500 μm, the diameter of which is smaller than the particle size of the molding sand. 4. The method of claim 3,
wherein the average diameter is 10-50 μm. 5. The method according to any one of claims 1 to 4,
wherein said device has, at its lower part, a sand inlet that can be advanced into a filling frame serving as a part defining the forming space. A method of introducing molding sand into a molding space using air using the sand introducing device according to claim 5, the method comprising the steps of: defining a molding space;
fluidizing the molding sand in the body by injecting compressed air into the body of the sand introducing device through the breathable partition plate of the sand introducing device; and
Controlling the discharge of the air from the filling frame so that the ratio of the molding sand injected from the sand inlet is increased or decreased, while controlling the rate of exhaust from the pattern plate, A method of introducing molding sand into a molding space, comprising the step of filling the molding sand with a molding sand, and partially adjusting the density of the molding sand filled in the molding space A molding method using the air-using sand introducing device according to any one of claims 1 to 5, comprising the steps of: holding a match plate between an upper flask and a lower flask;
defining an upper mold molding space and a lower mold molding space by inserting an upper squeezing means and a lower squeezing means into openings of flasks disposed opposite to the openings of the flasks adjacent to the match plate;
introducing the molding sand into the molding space for the upper and lower molds through a nozzle mounted on the lower portion of the sand introducing device; and
By advancing the upper and lower squeezing means toward the match plate to press the molding sand in the molding space, the upper and lower
A molding method comprising the step of simultaneously producing a secondary mold and a lower mold. 8. The method of claim 7,
The molding sand is introduced into the molding space while the molding space is tilted or after the molding space is inclined at an angle. A molding machine using the air-using sand introducing device according to any one of claims 1 to 4, comprising the steps of: holding a match plate between an upper flask and a lower flask;
The molding space for the upper mold and the molding space for the lower mold are formed by inserting upper squeeze means and drag squeeze means into the openings of the flasks disposed opposite to the openings of the flasks adjacent to the match plate. defining; and
By advancing the upper and lower squeezing means toward the match plate to press the molding sand in the molding space for the upper mold and the lower mold, the upper mold and the lower mold are produced by the step of producing the upper mold and the lower mold, wherein the upper and lower molds are wherein the sand introducing device using air to introduce the molding sand into the molding space for the lower mold can be inclined in a vertical plane. As a molding machine,
a rotating frame mounted on a support shaft for vertical rotation in a vertical plane;
a pair of opposing flasks mounted on the rotating frame and each having a sand inlet on a side wall thereof;
flask moving means for moving the pair of flasks so as to approach or separate the flasks from each other to form a molding space and remove the molds;
a sand introduction device holding the molding sand therein and introducing the molding sand into a pair of opposing flasks through the sand inlet; and
and squeezing means for delimiting the molding space with an adjoining opposing flask and a match plate held therebetween, and for pressing the molding sand filled in the opposing flask;
The molding sand is introduced while tilting the molding space with respect to a vertical line. 11. The method of claim 10,
a guide rod fixed to the rotating frame and a pair of opposing flask moving members;
and the pair of opposing flasks are fixed to the flask moving member. 12. The method of claim 10 or 11,
the sand introduction device includes a body, the body serving as a double wall pressure tank structure of a breathable divider defining a wall of the body and a chamber therebetween;
The molding sand is introduced into the molding space while the molding sand in the sand introducing device is fluidized by the compressed air injected from the pressure tank structure through the breathable porous divider. 13. The method of claim 12,
The sand introducing device using the air is the sand introducing device according to any one of claims 2 to 4, A molding machine. 12. The method of claim 10 or 11,
and the sand introducing device includes means for supplying compressed air to the molding sand held in the sand introducing device from above.

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