JP6239980B2 - Mold making equipment - Google Patents

Description

  The present invention relates to a mold making apparatus for making a casting sand thrown into a casting frame evenly.

  Conventionally, the molding of a mold is performed by casting sand into a molding space formed by a model surface plate, a casting frame surrounding the periphery of the model surface plate, and an upper frame superposed on the casting frame, and a rear surface formed as a mold. The squeeze head filled in the casting frame is hardened by a squeeze head squeezed from the side or a squeeze table squeezed from the model surface side of the model surface plate provided with the model.

  And among the foundry sand thrown into the modeling space, the foundry sand that rises and accumulates from the upper part of the upper frame is squeezed into stable foundry sand by adjusting the deposition amount to be constant, The leveling member is scraped by moving along the upper end of the upper frame.

In Patent Document 1 showing the prior art, a squeeze table and a squeeze head which are provided so as to be able to move forward and backward relative to each other along a molding path, and a model surface plate to which a model is attached are movable up and down. The provided lower frame, a casting frame polymerization apparatus that superimposes the casting frame and the upper frame on the lower frame, and a polymerization casting frame, and the upper end portion of the polymerization casting frame among the foundry sand put into the polymerization casting frame Means for scraping the raised upper surface and scraping sand hopper for containing scraped foundry sand are described.
By using such a mold making device, the casting sand that has risen from the upper end of the polymerization casting frame is scraped off and stored in the scraping sand hopper, and the sand that has been stored in the scraping sand hopper is put into the lower filling frame before molding. It is said that the sand that has been scraped off can be used as a part of the foundry sand used for the next molding.

Japanese Patent No. 3547733

However, in the thing of patent document 1, since the means which scrapes off the foundry sand which rose from the upper end part of the superposition | polymerization casting frame is the "inner lower end surface" of the wall which comprises a measurement hopper, it is a surface provided vertically. In the course of scraping, the density of the foundry sand in the polymerization casting frame on the forward end side in the advancing direction is increased, which may cause variations in mold strength and cause a dimensional accuracy defect of the product after pouring the molten metal.
At the end of scraping where the scraping means is located on the advance end side in the direction of travel of the polymer casting frame, the amount of sand stored on the progress direction side of the surface of the scraping means is larger than the amount of sand at the beginning of scraping. Therefore, the surface of the scraping means moves while pressing a large amount of accumulated sand against the polymer casting frame, so that the sand density of the foundry sand becomes high at the part where the sand is largely pressed into the polymerization casting frame. This is because the sand density is considered to be uneven.

  The present invention has been made in view of the above-described conventional problems, and provides a mold making apparatus capable of uniformly shaping casting sand introduced into a casting frame without causing high or low sand density. That is.

The structural features of the invention according to claim 1 are: a squeeze head that squeezes the foundry sand, a squeeze table that moves relative to the squeeze head along a molding path, and a model that is attached to the squeeze table. A surface plate, a casting frame that forms a molding space filled with foundry sand together with the model surface plate, an overlay frame that is polymerized on the upper end of the casting frame to form a polymerized casting frame together with the casting frame, and formation A hopper that temporarily stores the foundry sand to be put into the superposed casting frame, and a direction that is movable in a smoothing direction for smoothing the upper surface of the cast sand thrown into the superposed casting frame, and that intersects the smoothing direction A casting sand leveling member extending to the horizontal direction, a leveling member advancing / retracting device for moving the casting sand leveling member relatively in a horizontal plane including the leveling direction with respect to the superposition casting frame, and a hopper At the bottom Vignetting, comprising a guide tube portion having a lower end to allow juxtaposed with the top of the polymerization cope flask, the said guide tube portion has a lower end portion of to if the of the guide tube portion and the direction opposite to the rear wall And having a notch opening that is open at the bottom and communicates the inside of the guide cylinder and the outside of the guide cylinder, and the casting sand leveling member has a top end in the leveling direction. A sharp end portion formed so as to be inclined, and a foundry sand reservoir that stores the foundry sand that is continuous with the sharp end portion and extends toward the receding side in the leveling direction and is skimmed by the sharp end portion. possess a part, a together with the pointed end facing the direction to if the is that the are fixed to the cutout opening as distal sharp end portion does not protrude to the inside of the guide tube portion .

  According to this, after the casting sand is put into the polymer casting frame, the side portion of the casting sand that has a sharp edge when the casting sand leveling member scrapes off the molding sand that has risen above the polymerization casting frame. Next, the casting sand is scooped upward by the inclined top surface of the sharp end portion. Thus, since the foundry sand is scooped upward, the foundry sand is not stored in front of the sharp end portion of the foundry sand leveling member. And the scooped foundry sand moves to a foundry sand reservoir that is continuous with the sharp end and is stored.

In this way, the raised foundry sand is removed by the action of scooping upward, and the leveling direction without storing the foundry sand or pressing it laterally in front of the foundry sand leveling member that advances in the leveling direction. The sand density of the foundry sand is partially reduced without generating a state of pressing the foundry sand into the polymerized casting frame even at the end of scraping on the forward end side of the polymerized casting frame. Can be prevented. In this way, by equalizing the sand density of the molding sand to be molded, it is possible to cast a product with high dimensional accuracy while preventing variations in mold strength.
In addition, since the sharp end of the cast sand leveling member is provided at the lower end of the rear wall opposite to the leveling direction of the guide tube portion so as to face the leveling direction, When the guide cylinder portion is moved laterally from the position aligned with the polymer casting frame, the movement of the upper surface of the foundry sand introduced into the polymer casting frame is simultaneously performed. In this way, the foundry sand raised on the upper part of the polymer casting frame can be scraped quickly without causing excessive movement. Further, since the sharp end portion is fixed to the notch opening so as not to protrude to the inside of the guide tube portion, the charging operation can be performed smoothly without hindering the casting sand.

A structural feature of the invention according to claim 2 is that the foundry sand leveling member is provided such that the foundry sand storage portion protrudes outside the rear wall on the opposite side of the leveling direction of the guide tube portion. The mold making apparatus according to claim 1 .

  According to this, since the foundry sand storage part is provided to protrude outside the rear wall on the opposite side of the guide cylinder part in the forward direction, the required size sand sand storage capacity is required for storing the foundry sand to be scraped off. The part can be designed easily.

The structural feature of the invention according to claim 3 is that the foundry sand reservoir is laterally extended from one end extending in the leveling direction continuously to the sharpened end toward the other end on the opposite side. 3. The mold making apparatus according to claim 1 or 2 , wherein the casting molding apparatus is a curved storage part configured to bend in a vertical direction from a direction and store casting sand moving from the one end side on the other end side.

  According to this, when the foundry sand scooped up at the sharp end is sent to and stored in the foundry sand reservoir, the foundry sand moves smoothly in the curved reservoir and becomes larger when the foundry sand is sent. Since no resistance is generated, casting sand is not stored in front of the sharp end. Therefore, when leveling the upper surface of the foundry sand thrown into the polymer casting frame, a state in which the foundry sand is pressed into the polymer casting frame is not generated. Further, by raising the foundry sand reservoir in the vertical direction, the foundry sand reservoir can be formed in a compact manner, and space saving can be achieved.

The structural feature of the invention according to claim 4 is that the notch opening is formed between the casting sand leveling member and the guide tube portion when the casting sand is introduced into the superposed casting frame. A closed position for closing, a storage position for retreating when leveling the upper surface of the casting sand thrown into the polymerization casting frame to open the notch opening and storing the casting sand in the casting sand storage section; and closed reservoir sweep plate advances after storage of the casting sand in foundry sand reservoir is positioned and sweeping located sweeping molding sand from the foundry sand reservoir, a casting mold making system according to claim 3, further comprising It is to be.

  According to this, the closed storage sweeping plate can close the notch opening at the time of charging, and can prevent the casting sand from blowing out from the notch opening of the guide cylinder part. In addition, the closed storage and sweeping plate opens the notch opening and retreats when leveling the upper surface of the foundry sand so that the notched opening and the foundry sand storage part communicate with each other. Can be smoothly stored in the foundry sand storage part. Further, the closed storage and sweeping plate may prepare the leveling of the next upper surface of the foundry sand of the foundry sand leveling member by leveling the upper surface of the foundry sand and then sweeping the foundry sand stored in the foundry sand storage part. it can. In this way, with a series of lean movements of the closed storage and sweeping plate, it is possible to quickly prepare for casting sand, leveling the upper surface of the foundry sand, and leveling the next upper surface of the foundry sand.

A structural feature of the invention according to claim 5 is that the closed storage and sweeping plate is pivotally supported at the upper end of the notch opening portion of the guide tube portion so that the base end portion is pivotable, and the distal end portion is A positioning rotation drive device that is provided slidably along the curved surface of the curved storage portion and that rotates and positions the closed storage / sweeping plate to the closed position, the storage position, and the sweep position. Item 5. A mold making apparatus according to Item 4 .

  According to this, the base end portion is pivotally supported by the upper end of the notch opening portion of the guide tube portion, and the tip end portion is provided so as to be slidable along the curved surface of the curved storage portion. With a simple structure that enables the closed storage / sweeping plate to be rotated to the closed position, storage position and sweep position by the drive device, the notch opening is closed when casting sand is poured, and the top surface of the casting sand is smoothed. The operations of opening the notch opening at that time, storing the foundry sand, and preparing the next top surface of the foundry sand by sweeping the foundry sand can be performed quickly and without waste.

The side view which shows the outline | summary of embodiment of the mold making apparatus of this invention. The elements on larger scale of a pointed end. The figure which shows the process by which casting sand is filled into the superposed | polymerized casting frame and the upper overlay frame. The figure which shows the state which leveles the foundry sand which rose on the superposition | polymerization cast frame with a foundry sand leveling member. The figure which shows the state which positions a closed storage sweeping board in a discharge position after leveling, and sweeps molding sand. The figure which shows the state which lowers a squeeze head and squeezes from the back, and carries casting sand from a conveyor to a hopper. The figure which shows the state just before raising a squeeze head and removing. The plane schematic diagram of the superposition | polymerization casting frame which shows each position which detected the intensity | strength of the foundry sand at the time of performing the smoothing test using the foundry sand leveling member. The graph which shows mold intensity. The side view which shows the other modification of a foundry sand leveling member with sectional drawing. The side view which shows the other modification of a foundry sand leveling member with sectional drawing.

(Example)
An embodiment using a mold making apparatus according to the present invention will be described below with reference to the drawings. The mold making apparatus 2 includes a squeeze table 6 having a model surface plate 4 fixed on the upper surface, a casting frame 8 placed on the model surface plate 4, a top frame 10 placed on the casting frame 8, a model The foundry sand supply device 14 for feeding the foundry sand 12 into the molding space formed by the surface plate 4, the casting frame 8 and the upper frame 10 and the foundry sand in the molding space are indexed to a position facing the squeeze table 6. 12 is provided with a squeeze head 16 for squeezing from the back.

  As shown in FIG. 1, the squeeze table 6 is formed in a rectangular cross section and is fixed to the base 40. The squeeze table 6 has a casting frame 8 mounted thereon, and the overlay frame 10 is superposed on the casting frame 8. A polymer casting frame 11 is formed by the casting frame 8 and the overlay frame 10.

  A shuttle device 18 that moves in the horizontal direction is provided above the superposed casting frame 11, and a foundry sand supply device 14 and a squeeze head 16 are provided side by side in the shuttle device 18. The foundry sand supply device 14 and the squeeze head 16 are positioned by being indexed to a sand supply position and a squeeze position by a shuttle cylinder 18a of the shuttle device 18, respectively.

  The shuttle device 18 includes a shuttle cylinder 18a fixed to an unillustrated structure, a piston portion 18b fitted into the shuttle cylinder 18a, an unillustrated guide rail horizontally mounted on the structure, and the guide rail. The horizontal support member 24 is provided so as to be horizontally movable along the casting sand supply device 14 and the squeeze head 16 so as not to be relatively movable. The hydraulic pump 20 drives the piston portion 18b.

The shuttle cylinder 18 a communicates with a hydraulic pump 20 as a drive source, and a shuttle cylinder electromagnetic valve 22 is provided between the shuttle cylinder 18 a and the hydraulic pump 20.
The piston portion 18b fitted into the shuttle cylinder 18a is provided so as to be able to advance and retreat from the distal end portion of the shuttle cylinder 18a. The tip of the piston portion 18 b is connected to the end of the horizontal support member 24 so as not to be relatively movable. By switching the shuttle cylinder electromagnetic valve 22, the horizontal support member 24 connected to the piston portion 18 b moves in the horizontal direction so that the squeeze head 16 or the foundry sand supply device 14 is opposed to the superposed casting frame 11. For example, when the shuttle cylinder solenoid valve 22 positioned at the central stop position in FIG. 1 is switched to the right position, the hydraulic pressure from the hydraulic pump 20 flows into the side of the shuttle cylinder 18a protruding from the piston portion 18b, and the piston By moving the portion 18b forward, the foundry sand supply device 14 and the squeeze head 16 supported by the horizontal support member 24 are moved in the right direction in FIG.

  The foundry sand supply device 14 includes a square container-like hopper 26 for measuring and temporarily storing the foundry sand 12 necessary for molding, a guide tube portion 28, a conveyor device 30 and the like.

  A shutter 32 capable of holding the foundry sand 12 is provided at the lower end of the hopper 26. The shutter 32 includes, for example, two bottom plates 32c that are pivotally supported around horizontal axes 32a and 32b that are parallel to each other, and are each rotated by a motor 34 disposed in the hopper 26.

  For example, the two horizontal shafts 32a and 32b of the shutter 32 are rotatably supported by a bearing portion (not shown) provided on the wall portion of the hopper 26, and one end portion of one horizontal shaft 32a is not shown. Sprockets are installed around the circumference. Further, an unillustrated reverse rotation mechanism using a gear is provided between one horizontal shaft 32a and the other horizontal shaft 32b. The sprocket of one horizontal shaft 32 a is engaged with, for example, a chain member (not shown), and the chain member is circulated by a motor 34. When one horizontal shaft 32a rotates in one direction due to the rotation of the motor 34, the other horizontal shaft 32b rotates in the other direction. In this way, the two bottom plates 32c of the shutter 32 rotate in the opposite directions and are positioned in the horizontal state and the vertical state. When the two bottom plates 32c of the shutter 32 are positioned in the horizontal state, the foundry sand 12 can be held, and when the two bottom plates 32c are positioned in the vertical state, the foundry sand 12 stored in the hopper 26 falls. .

The conveyor apparatus 30 is provided above the hopper 26 as shown in FIG. The conveyor device 30 is provided with a conveyor belt 30b that is circulated and driven by rollers 30a. The conveyor belt 30b conveys the foundry sand 12 and puts it into the hopper 26.
A guide tube portion 28 formed in a rectangular tube shape is provided at the lower portion of the hopper 26. The guide cylinder portion 28 is connected to the lower end portion of the hopper 26 so as not to be relatively movable by a connection bracket (not shown). The lower end portion of the guide tube portion 28 is disposed close to the upper end portion of the superposed cast frame when the hopper 26 is indexed to the sand supply position. Further, when indexed to the sand supply position, the bottom plate 32c of the shutter 32 is rotated from the horizontal state to the vertical state, and the foundry sand 12 stored in the hopper 26 is guided by the guide cylinder portion 28 and is overlapped. 11.

  At the lower end of the left side wall portion (the rear wall 37 on the side opposite to the leveling direction) in FIG. A foundry sand leveling member 38 is fixed to the notch opening 36 by welding, for example. The leveling direction is a direction in which the foundry sand leveling member 38 moves in a direction to scrape the foundry sand 12 raised on the upper portion of the upper frame 10 by the shuttle device 18, and in FIG. Is a direction in which the upper frame 10 moves from the left end side to the right end side.

  The foundry sand leveling member 38 extends slightly longer than the width of the upper frame 10 in a direction perpendicular to the direction moved by the shuttle device 18. As shown in FIG. 2, the foundry sand leveling member 38 has a sharpened end portion 42 facing the inside of the guide tube portion 28 and a foundry sand storage portion 44 for storing the scraped foundry sand 12. Yes. The foundry sand storage portion 44 is formed in a curved shape from the horizontal direction to the vertical direction from the one end portion 44a extending in the smoothing direction continuously to the sharp end portion 42 to the other end portion 44b on the opposite side. It is a curved reservoir 44c for storing the foundry sand 12 moving from the 44a side on the other end 44b side. The curved storage part 44c is provided in a state of protruding to the outside of the rear wall 37 on the opposite side to the leveling direction.

  A closed storage and sweeping plate 46 is provided between the casting sand leveling member 38 and the rear wall 37 in which the notch opening 36 is formed. The closed storage and sweeping plate 46 is pivotally supported by a hinge 47 so that the base end portion is pivotally supported at the upper end of the notch opening 36 of the guide tube portion 28, and the distal end portion is along the curved surface of the curved storage portion 44 c. It is slidably provided.

  The foundry sand leveling member 38 is positioned at the opening / closing drive motor 48 for opening and closing the closed storage sweeping plate 46, the closed position S for closing the notch opening 36, and the other end portion, so A position sensor 50 is provided at a storage position T communicating with the notch opening 36. In the present embodiment, the closing position S for closing the notch opening 36 also serves as a sweeping position. The opening / closing drive motor 48 and the position sensor 50 constitute a positioning rotation drive device that rotates and positions the storage position T and the sweep position.

  As shown in FIG. 1, the squeeze head 16 has a squeeze plate portion 16 a that can be inserted into the polymerization casting frame 11 and presses the upper surface of the foundry sand 12 put into the polymerization casting frame 11. A squeeze cylinder 16b is provided for moving the squeeze plate portion 16a up and down along the molding path in the polymerization casting frame 11. The squeeze cylinder 16b is fixed to the horizontal support member 24, and a piston 16c having a squeeze plate portion 16a provided at the lower end thereof is provided so as to be able to advance and retreat. The squeeze cylinder 16 b communicates with the hydraulic pump 15, and a squeeze solenoid valve 21 is provided between the squeeze cylinder 16 b and the hydraulic pump 15. A relief valve 23 is provided between the squeeze electromagnetic valve 21 and the base end side of the squeeze cylinder 16 b, and the squeeze pressing force can be adjusted by the relief valve 23.

Next, the test results of the inventors using the present mold making apparatus will be described with reference to FIGS.
FIG. 8 is a plan view showing an outline of the rectangular polymer casting frame 11 used in the test, and casting sand 12 is put into the polymer casting frame 11. The leveling direction indicates the direction in which the foundry sand leveling member 38 is moved with respect to the superposed casting frame 11. The numbers 1 to 10 indicate positions where the mold strength was measured when the mold was formed by squeezing after leveling. This measured position corresponds to the number of the measurement site in FIG. FIG. 9 is a graph showing the relationship between the mold strength and the measurement site. The test results of the conventional example are shown by square points, and the test results of the present mold making apparatus are shown by round points. In the conventional example, the mold strength after molding has become a ^{14N / cm 2 ~20N / cm 2} , the measurement site 1 is beginning to become a measurement site 10 is end break, large variation in mold strength Has produced. Herein casting mold making system for this, it has a ^{15N / cm 2 ~17N / cm 2} , large variation in mold strength at end break and start to become has not occurred. Thus, since the variation in mold strength is prevented, the product after pouring the molten metal can be cast with high dimensional accuracy.

  Next, the operation of the mold making apparatus 2 configured as described above will be described below with reference to the drawings. First, as shown in FIG. 1, the molding sand supply device 14 is indexed to the sand supply position by the shuttle device 18, and is disposed to face the squeeze table 6. The hopper 26 of the foundry sand supply device 14 holds the bottom plate 32c of the shutter 32 in a horizontal state, and measures and stores the foundry sand 12 necessary for molding in advance. Between the squeeze table 6 and the foundry sand supply device 14, the model surface plate 4 placed and fixed on the squeeze table 6 and a molding model (not shown) fixed to the surface of the model surface plate 4 are arranged. . A cast frame 8 is placed on the model surface plate 4 by an unillustrated cast frame delivery device, and an upper frame 10 is placed on the cast frame 8 by an unillustrated upper frame support member. The shuttle cylinder solenoid valve 22 is positioned at the center position, and the supply of oil from the hydraulic pump 20 to the shuttle cylinder 18a is stopped. In the squeeze head 16, the squeeze solenoid valve 21 is determined at the center position, and the squeeze plate portion 16a is fixed at the rising end position.

Next, as shown in FIG. 3, the bottom plate 32 c of the shutter 32 of the hopper 26 is rotated from the horizontal state to the vertical state by driving the motor 34. As a result, the foundry sand 12 temporarily stored in the hopper 26 is put into a molding space constituted by the model surface plate 4, the casting frame 8 and the upper frame 10. At this time, the closed storage and sweeping plate 46 is positioned at the closed position S, and closes the notch opening 36 of the guide tube portion 28. Since the casting sand 12 is weighed and put in a little more than the volume of the modeling space, the casting sand 12 rises from the upper end of the upper frame 10. It if molding sand member 38 is positioned on the upper end of the upper Sheng frame 10, sharp tip portion 4 2 at the foot portion of the raised sand 12 is in a state facing each other.

Next, the closed storage sweeping plate 46 is positioned at the storage position T by driving the opening / closing drive motor 48. Thereby, the notch opening 36 and the foundry sand reservoir 44 communicate with each other. Subsequently, the shuttle cylinder electromagnetic valve 22 is positioned at the left side position, and the piston 18b is advanced by communicating the hydraulic pump 20 to the proximal end side (left side in FIG. 4) of the shuttle cylinder 18a of the shuttle device 18. As a result, the foundry sand leveling member 38 moves in the leveling direction along the upper end of the upper frame 10 and leveles the foundry sand 12 raised on the upper frame 10. The sharp end 42 moves so as to pierce the side surface of the raised foundry sand 12, so that no lateral pressure is applied to the foundry sand 12. Further, the foundry sand 12 is scooped upward along the top end surface 42a. Since all of the scraped foundry sand 12 is stored in the foundry sand storage part 44, the foundry sand 12 is not stored in front of the moving sharp end 42.
Further, the bottom plate 32c of the shutter 32 is rotated from the vertical state to the horizontal state by the drive of the motor 34.

  Next, by driving the shuttle cylinder 18 a of the shuttle device 18, the squeeze head 16 is indexed to the squeeze position and faces the squeeze table 6. When the squeeze head 16 is indexed to the squeeze position, the shuttle cylinder solenoid valve 22 is switched to the center position, and the squeeze head 16 stops moving. The hopper 26 stops at a position deviated from the upper frame 10. Then, by driving the opening / closing drive motor 48, the front end of the closed storage sweeping plate 46 is slid along the inner wall of the curved storage portion 44c, and the closed storage sweeping plate 46 is swept from the storage position T (same as the closed position S). ). As a result, the foundry sand 12 stored in the foundry sand storing part 44 falls into a not-shown foundry sand collecting container provided below the hopper 26 and the guide cylinder part 28.

Next, by switching the squeeze solenoid valve 21 to the left position, the base side of the squeeze cylinder 16b is communicated with the hydraulic pump 15, and the piston 16c is advanced. Thereby, the squeeze plate part 16a is fitted in the upper frame 10 and brought close to the squeeze table 6, thereby squeezing the foundry sand 12 from the back side. The pressing force when squeezing is adjusted by a relief valve 23 provided between the squeeze cylinder 16b and the squeeze solenoid valve 21.

  The foundry sand 12 is transported by the conveyor belt 30 b of the conveyor device 30 and stored in the hopper 26. The hopper 26 measures and stores the foundry sand 12 necessary for one molding. Thus, the next casting sand 12 is prepared.

  Next, the piston 16c moves backward by switching the squeeze solenoid valve 21 to the right position so that the tip of the squeeze cylinder 16b communicates with the hydraulic pump 15. As a result, the squeeze plate portion 16 a rises and comes off from the upper frame 10. Subsequently, the upper frame 10 is removed, and the casting mold 8 and the casting frame 8 which are formed on a conveyor (not shown) are transported and carried to the next process such as a mold matching position (not shown).

  The shuttle cylinder solenoid valve 22 is switched to the right side position so that the hydraulic pump 20 communicates with the front end side of the shuttle cylinder 18a, and the piston portion 18b is moved backward. Thereby, as shown in FIG. 1, the hopper 26 is indexed to the sand supply position.

  According to the mold making apparatus 2 configured as described above, after the foundry sand 12 has been put into the polymer casting frame 11, the foundry sand leveling member 38 scrapes the foundry sand 12 raised above the polymer casting frame 11. At the time of picking, the sharp end portion 42 is moved so as to pierce the side surface portion of the raised foundry sand 12 from the lateral direction, and then the foundry sand 12 is scooped upward by the inclined top end surface 42a of the sharp end portion 42. Thus, since the foundry sand 12 is scooped upward, the foundry sand 12 is not stored in front of the sharpened end portion 42 of the foundry sand leveling member 38, and the sharpened end portion 42 is cast toward the leveled direction. The sand 12 is not pushed and moved. Then, the scraped foundry sand 12 is moved and stored in the foundry sand reservoir 44 that is continuous with the sharp end 42.

  In this way, the raised foundry sand 12 is removed by the action of scooping upward, so that the foundry sand 12 is stored in front of the advancing foundry sand leveling member 38 and is not pushed in the lateral direction. Since the sand is stored in the backward casting sand storage section 44, the sand of the molding sand 12 is generated without generating a state in which the molding sand 12 is pressed into the polymerization casting frame 11 even at the end of scraping on the forward end side of the polymerization casting frame 11. It is possible to prevent the density from partially increasing. In this way, by uniforming the sand density of the molding sand 12 to be molded, it is possible to prevent a variation in mold strength and cast a product with high dimensional accuracy.

In addition, since the sharp end 42 of the cast sand leveling member 38 is provided at the lower end of the guide cylinder portion 28 opposite to the leveling direction, facing the leveling direction, After the sand 12 is thrown in, the guide cylinder portion 28 is moved away from the polymer casting frame 11 to move the upper surface of the molding sand 12 thrown into the polymer casting frame 11 at the same time. In this way, the foundry sand 12 raised on the upper part of the polymer casting frame 11 can be scraped quickly without causing any extra movement. Further, since the sharp tip portion 4 2 is fixed to the notched opening 36 so as not to protrude to the inside of the guide tube portion 28, be performed smoothly turned work without becoming an obstacle at the time of turn-on of casting sand 12 it can.

  In addition, the foundry sand storage part 44 is provided so as to protrude outside the rear wall on the opposite side of the guide cylinder part 28 in the forward direction, so that the foundry sand having a capacity necessary for storing the foundry sand 12 to be scraped off is provided. The storage part 44 can be designed easily.

  Further, when the foundry sand 12 scooped by the sharp end portion 42 is sent to and stored in the foundry sand reservoir 44, the foundry sand 12 moves smoothly in the curved reservoir 44c. Since no great resistance is generated when being sent, the foundry sand 12 is not stored in front of the sharp end 42. Therefore, when the upper surface of the foundry sand 12 put into the polymer casting frame 11 is smoothed, a state in which the foundry sand 12 is pressed into the polymer casting frame 11 is not generated. Moreover, by raising the foundry sand storage part 44 in the vertical direction, the foundry sand storage part 44 can be formed compactly, and space saving can be achieved.

  Further, the closed storage / sweeping plate 46 closes the notch opening 36 at the time of charging, and can prevent the casting sand 12 from being blown out from the notch opening 36 of the guide cylinder portion 28. Further, when the upper surface of the foundry sand 12 is leveled, the closed storage sweeping plate 46 opens the notch opening 36 and retreats so that the notch opening 36 and the foundry sand storage part 44 communicate with each other. The taken foundry sand 12 can be smoothly stored in the foundry sand storage part 44. Further, the closed storage and sweeping plate 46 smoothes the top surface of the foundry sand 12 and then sweeps the foundry sand 12 stored in the foundry sand storage portion 44 to smooth the top surface of the foundry sand 12 next to the foundry sand leveling member 38. Can be ready. In this way, with a series of lean movements of the closed storage sweep plate 46, the preparation of the casting sand 12, the smoothing of the upper surface of the casting sand 12, and the smoothing of the upper surface of the casting sand 12 of the next molding is quickly performed. be able to.

Further, the base end portion is pivotally supported on the upper end of the notch opening 36 of the guide tube portion 28 and the tip end portion is slidably provided along the curved surface of the curved storage portion 44c. The positioning drive device 48 has a simple structure in which the closed storage / sweeping plate 46 can be rotated and positioned to the closed position S, storage position T, and sweeping position, and the notch opening 36 at the time of casting sand 12 injection is provided. closing, opening and retention of casting sand 12 in the notched opening 36 when leveling the molding sand 1 2 top, and the work of the next casting sand 12 the top surface of the break-prepared by sweeping the casting sand 12, without waste and quickly Can be executed.

  In the above embodiment, the casting sand reservoir 44 is a curved reservoir that is curved from the horizontal direction to the vertical direction from the one end to the other end on the opposite side, but is not limited thereto. For example, as shown in FIG. 10, the casting sand reservoir may be formed with an inclined surface 54 without being bent, or may be formed with a horizontal surface 56 as shown in FIG. 11.

  Moreover, although the casting sand leveling member is fixed to the guide tube portion by welding, the present invention is not limited to this. For example, the cast sand leveling member may be formed integrally with the guide tube portion by pressing or drawing.

  In addition, although only the back side squeeze is performed in the squeeze operation, the present invention is not limited to this. For example, a superposition frame is superimposed on the bottom of the casting frame on which the upper formation frame is superimposed. The squeeze from the model surface side may be performed by pressing the squeeze table from the model surface side after the back side squeeze and moving the model surface plate relative to the casting frame upward. Furthermore, you may perform both the squeeze from the model surface side and the squeeze from the back side.

  Further, the closed storage and sweeping plate 46 is pivotally supported at the upper end of the notch opening 36 of the guide tube portion so that the base end portion is pivotable, and the distal end portion is provided so as to be slidable along the curved surface of the curved storage portion 44c. However, the present invention is not limited to this. For example, a first closing plate that closes the notch opening in the closed position, and a second closing plate that closes the rear end portion of the foundry sand storage portion in the storage position. It may have.

  Moreover, although the closed position and the sweep position are the same position, the present invention is not limited to this. For example, the sweep position may be shifted to the inside or the outside of the guide tube portion.

  Further, the sharp end portion 42 has a flat surface with a front end portion (see FIG. 2) and a front end upper surface 42a intersecting with the flat surface. However, the present invention is not limited to this. A curved convex surface may be used.

  Moreover, although the guide cylinder part is a separate body from the hopper, the present invention is not limited to this. For example, the guide cylinder part may be integrally formed with the hopper.

  Thus, the specific configuration described in the above-described embodiment is merely an example of the present invention, and the present invention is not limited to such a specific configuration. Various embodiments can be adopted without departing from the scope.

  DESCRIPTION OF SYMBOLS 2 ... Mold making apparatus, 4 ... Model surface plate, 6 ... Squeeze table, 8 ... Cast frame, 9 ... Master table, 10 ... Overlay frame, 11 ... Superposition cast frame, 12 ... Foundry sand, 16 ... Squeeze head, 18 ... advancing / retracting device (shuttle device), 26 ... hopper, 28 ... guide cylinder, 36 ... notched opening, 37 ... rear wall, 38 ... casting sand leveling member, 42 ... pointed end, 42a ... tip Upper surface, 44 ... casting sand storage part, 44c ... curved storage part, 48 ... rotation drive device (opening / closing drive motor), S ... closed position / sweep position, T ... storage position.

Claims (5)

A squeeze head for squeezing foundry sand;
A squeeze table that moves forward and backward relative to the squeeze head along the molding path;
A model surface plate attached to the squeeze table;
A casting frame that forms a molding space filled with foundry sand together with the model surface plate;
An overlay frame that is polymerized to the upper end of the cast frame to form a polymer cast frame together with the cast frame;
A hopper for temporarily storing foundry sand to be charged into the formed polymer casting frame;
A casting sand leveling member that is movable in a leveling direction for leveling the upper surface of the casting sand thrown into the superposition casting frame and extends in a direction intersecting the leveling direction;
A leveling member advancing / retreating device for moving the casting sand leveling member relatively back and forth in a horizontal plane including the leveling direction with respect to the superposition casting frame;
Provided at the lower part of the hopper, and a lower end part of the guide tube part that can be arranged close to the upper part of the superposed cast frame
The guide tube portion is formed at the lower end portion of the rear wall opposite to the leveling direction of the guide tube portion so that the lower portion is open, and the inside of the guide tube portion communicates with the outside of the guide tube portion. Has a notch opening,
The casting sand leveling member has a sharpened end formed so that the top surface in the leveling direction is inclined, and extends toward the receding side in the leveling direction continuously to the sharpened end, possess the molding sand reservoirs that store rake taken foundry sand by sharp tip portion, the projecting together with the pointed end facing the direction to if the, inside of the distal sharp end the guide tube portion The mold making apparatus is fixed to the notch opening so as not to occur . It if the foundry sand member, the molding sand reservoir is the guide tube portion wherein if to the direction opposite to the casting mold making system of claim 1, wherein provided to protrude to the outside of the rear wall. The casting sand storage portion is formed in a curved shape from a horizontal direction to a vertical direction from one end portion extending in the smoothing direction continuously to the sharpened end portion to the other end portion on the opposite side, and the one end portion 3. The mold making apparatus according to claim 1, wherein the casting molding apparatus is a curved storage section that stores casting sand moving from the side on the other end side. Between the casting sand leveling member and the guide tube portion, a closed position for advancing and closing the notch opening portion when the casting sand is put into the polymerization casting frame, and charging into the polymerization casting frame When the upper surface of the foundry sand is leveled, the notch opening is retreated and the casting sand is stored in the foundry sand reservoir, and the casting sand is stored in the foundry sand reservoir. casting mold making system of the closed reservoir sweep plate positioned in a sweeping located sweeping molding sand further comprises claim 3, wherein from the molding sand reservoir Te. The closed storage and sweeping plate is pivotally supported at the upper end of the notch opening portion of the guide tube portion so as to be rotatable, and the distal end portion is slidable along the curved surface of the curved storage portion. Provided,
The mold making apparatus according to claim 4 , further comprising a positioning rotation driving device that rotates and positions the closed storage and sweeping plate to the closed position, the storage position, and the sweeping position.

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