JPH10323738A - Method and apparatus for pre-compressing molding sand - Google Patents

Abstract

(57) [PROBLEMS] To provide a thin sheet of molding sand near the inner and outer surfaces of the pattern of the pattern plate or near the inner surface of the molding frame including the same with respect to the molding sand introduced into the space defined by the pattern plate and the molding flask. An object of the present invention is to provide a method and an apparatus for pre-compressing a pattern plate without damaging the pattern plate in pre-compression by a body. SOLUTION: A thin plate member 10 arranged corresponding to a pattern 4A shape of the pattern plate 4 is formed on a pattern plate 4 with respect to molding sand S introduced into a space defined by a pattern plate 4 and a casting frame 5. A pre-compression method for molding sand that is relatively inserted from above the molding sand S toward the pattern plate 4 until the insertion depth dimension or the insertion load value of the thin plate member 10 into the molding sand S is set in advance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for molding sand injected into a space defined by a pattern plate and a molding flask, in the vicinity of the inner and outer surfaces of the pattern of the pattern plate or in the vicinity of the inner surface of the molding frame including the same. The present invention relates to a method and an apparatus for pre-compressing molding sand in a mold making in which the entire molding sand is pressed after the molding sand is pre-compressed.

[0002]

2. Description of the Related Art Conventionally, a method and apparatus for molding a mold as described above are disclosed in Japanese Patent Application Laid-Open No. 9-10892 filed by the present applicant.
In this mold making, as the preliminary compression of the molding sand near the inner and outer surfaces of the pattern of the pattern plate, the thin plate is inserted into the molding sand with a predetermined compressive force and pre-compressed. I have.

[0003]

However, in such a pre-compression of molding sand, when a tall pattern is attached, the molding sand moves in the lateral direction when the thin plate is inserted into a deep gap. The molding sand is compressed to a high sand density in this part, and if the pattern plate is made of a material with low strength such as wood, the molding sand is deformed into a pattern plate by the molding sand compressed to a high density. There was a problem of causing damage such as cracks. An object of the present invention is to provide a method and an apparatus for pre-compressing molding sand without damaging a pattern plate, which has been made in view of the above problems.

[0004]

SUMMARY OF THE INVENTION In order to achieve the above object, a method for pre-compressing molding sand according to the present invention is directed to a method for molding sand injected into a space defined by a pattern plate and a molding flask. A method for pre-compressing molding sand in a mold for pressing the entire molding sand upper surface after pre-compressing molding sand near the inner and outer surfaces of the pattern of the pattern plate or near the inner surface of the molding flask including the same, wherein the pattern shape of the pattern plate The thin plate member corresponding to the pattern plate is inserted from above the casting sand toward the pattern plate until the insertion depth dimension or the insertion load value for the casting sand of the thin plate member set in advance according to the pattern plate is reached. The first pre-compression device for molding sand of the present invention is characterized in that a space defined by a pattern plate and a molding flask is provided. A pre-compressing apparatus for molding sand in a molding mold that presses the entire molding sand upper surface after pre-compressing molding sand near the inner and outer surfaces of the pattern of the pattern plate or near the inner surface of the casting frame including the same with respect to the injected molding sand. A thin plate disposed in correspondence with the pattern shape of the pattern plate is disposed above and below a lifting table which can be moved up and down by a hydraulic cylinder so as to be able to move up and down relatively to the lifting table; Alternatively, a displacement gauge for measuring the displacement is connected to the thin plate, and the displacement gauge is controlled to transmit a signal for stopping the extension operation of the hydraulic cylinder according to a predetermined insertion depth of the thin plate into the molding sand. The second pre-compression device for molding sand of the present invention is characterized in that the device is electrically connected to a hydraulic control valve of the hydraulic cylinder via a pressure vessel. The molding sand in the vicinity of the inner and outer surfaces of the pattern of the pattern plate or in the vicinity of the inner surface of the molding frame including the same is pre-compressed against the molding sand introduced into the space defined by the plate and the molding frame, and then the entire molding sand upper surface is pressed. A pre-compression device for molding sand in a mold making process, which is disposed above a lifting table which can be raised and lowered by a hydraulic cylinder, on a lower surface of a frame via a load sensor in accordance with the pattern shape of the pattern plate. The thin plate is disposed so as to be able to move up and down relatively to the lifting table, and the load sensor is configured to output a signal for stopping the extension operation of the hydraulic cylinder in accordance with a predetermined insertion load value of the thin plate into the molding sand. A third molding sand pre-compressing apparatus according to the present invention, wherein the apparatus is electrically connected to a hydraulic control valve of the hydraulic cylinder via a transmitting controller. Is a method of pre-compressing molding sand in the vicinity of the inner and outer surfaces of the pattern of the pattern plate or in the vicinity of the inner surface of the molding frame including the same, against the molding sand charged into the space defined by the pattern plate and the molding flask, and then molding the molding sand. A pre-compression device for foundry sand in mold molding that presses the entire upper surface, which corresponds to the pattern shape of the pattern plate via a load sensor on a lower surface of a frame above a lifting table that can be raised and lowered by a hydraulic cylinder. The thin plate body is disposed so as to be able to move up and down relatively to the lifting table, and a displacement meter for measuring the displacement is connected to the lifting table, and the load sensor and the displacement meter are set in advance. The extension operation of the hydraulic cylinder is performed based on a signal that has been detected, whichever comes first, that is, a signal that has reached an insertion load value or a signal that has reached an insertion depth dimension of the thin sheet body with respect to molding sand. The in which via the controller transmits a signal for stopping characterized by being electrically connected to the hydraulic control valve of the hydraulic cylinder.

[0005]

Embodiments of the present invention will be described below in detail with reference to the drawings. In FIG. 1, an upward hydraulic cylinder 2 is erected on a base 1, and an elevating table 3 is fixed to a tip of a piston rod of the hydraulic cylinder 2. A pattern plate 4 having a pattern 4A provided thereon is attached to an upper portion of the elevating table 3, and a casting frame 5 and a filling frame 6 are mounted on the pattern plate 4 to form the pattern plate 4 and the casting frame 5. The molding sand S is put into a space defined by the filling frame 6 and the filling frame S. Above the elevating table 3, a thin plate 10 is fixed to the lower surface of the frame 7 via a mounting base 8 and a mounting plate 9. As shown in FIG. 2, the thin plate member 10 has a plurality of plate members 10A and 10A disposed at positions corresponding to the shapes of the inner and outer surfaces of the pattern 4A, and corresponds to the vicinity of the inner surface of the casting frame (four corners in FIG. 2). Press plate 10B having an L-shaped cross section
Is arranged. The plurality of plate members 10A, 1
0A may be a continuous and integral plate material. Further, in the case of a pattern plate in which a large number of patterns 4A are arranged at a slight interval, the entire plate material 10A is connected in a lattice shape, or a part of the plate material 10A is formed in a lattice shape as shown in FIG. In other words, the plate member 10A may be configured to correspond to the shape of the pattern 4A.

Further, a displacement meter 11 for measuring the upward displacement of the lifting table 3 is provided on the base 1 by connecting the tip of a rod 12 to the side of the lifting table 3.
The displacement meter 11 is provided with a predetermined molding sand S of the sheet body 10.
Is electrically connected to a hydraulic control valve 14 of the hydraulic cylinder 2 via a controller 13 that transmits a signal for stopping the extension operation of the hydraulic cylinder 2 according to the insertion depth dimension of the hydraulic cylinder 2. That is, from the displacement meter 11, the height position when the lifting table 3 is raised (the thin plate 10 is
Is transmitted to the controller 13 at every moment, and the controller 13 informs the controller 13 that the insertion depth of the thin plate member 10 according to the preset pattern 4A has been reached. In response to this, a signal is output to the hydraulic control valve 14 of the hydraulic cylinder 2, and the hydraulic control valve 14 operates to stop the hydraulic cylinder 2 from rising.

[0007] The thin plate member 10 configured in this manner is set in advance according to the shape of the pattern 4A to be used.
Is inserted into the controller 13. In this state, the casting frame 5 and the filling frame 6 are placed on the pattern plate 4 above the elevating table 3, and after the molding sand S is put into the space defined by the pattern plate 4, the casting frame 5 and the filling frame 6. Then, the hydraulic cylinder 2 is operated to raise the pattern plate 4 and the like above the elevating table 3 so that the thin plate 10
Is inserted into the molding sand S, the molding sand S is pre-compressed, and the ascending displacement (height) of the elevating table 3 measured by the displacement meter 11 is output to the controller 13, and the measured value is set in advance. Is reached (the depth at which the thin plate member 10 is to be inserted into the foundry sand S), a signal is output to the hydraulic control valve 14 to operate the hydraulic valve 14 and stop raising the hydraulic cylinder 2. As shown in FIG. 1, the pre-compression of the molding sand is completed. Next, the hydraulic cylinder 2 is contracted to operate the thin plate member 10.
Is extracted from the molding sand S, and the entire molding sand is pressed by the operation of a pressing means (not shown) and the hydraulic cylinder 2 to perform mold molding.

Next, the pre-compression device for molding sand in FIG. 4 will be described. 4 is different from the device of FIG. 1 in that a mounting base 8 is mounted on the lower surface of the frame 7 via a load sensor 11A, and this load sensor 11A is electrically connected to the controller 13. Have been.
It should be noted that the controller 13 in this case is a thin plate member 10 set in advance.
When the load value of the load sensor 11A reaches the insertion load value for the molding sand S, a signal for stopping the extension operation of the hydraulic cylinder 2 is output to the hydraulic control valve 14 of the hydraulic cylinder 2. In addition, the displacement meter 11 shown in FIG. In the molding sand pre-compression device of FIG. 4 configured as described above, the thin plate 10 is inserted into the molding sand S and the molding sand S is pre-compressed as in the case of FIG. When the measurement signal from 11A reaches the preset load value of the thin plate member 10, a signal is transmitted from the controller 13 to the hydraulic valve 14 of the hydraulic cylinder 2, and the extension operation of the hydraulic cylinder 2 is stopped. Thereafter, the molding of the mold is performed in the same manner as the operation of FIG.

Next, the pre-compression device for molding sand in FIG. 5 will be described. 5, the displacement meter 1 shown in FIG.
1 and the load sensor 11A in FIG. 4 are provided at the same position, and are electrically connected to the respective common controllers 13. In this case, the controller 13 uses the hydraulic cylinder based on a signal that has been detected earlier, whichever comes first, that is, a signal that has reached the insertion depth dimension of the sheet metal 10 into the molding sand S or a signal that has reached the insertion load value. 2 is transmitted to the hydraulic valve 14 to stop the extension operation. Therefore, the preliminary compression of the molding sand is controlled by both the insertion depth dimension and the insertion load value of the thin plate member 10 into the molding sand which are set in advance, and the extension operation of the hydraulic cylinder 2 is stopped. The lifting table 3 and the thin plate 10 shown in FIGS. 1, 4 and 5 are relative to each other, and the lifting table 3 may be fixed, and the thin plate 10 may be raised and lowered by a hydraulic cylinder. . In this case, the displacement gauge 11 shown in FIGS. 1 and 5 is mounted on a frame 7 on which a hydraulic cylinder is mounted, and its rod is connected to a mounting base 8 or a mounting plate 9.

[0010]

According to the present invention, as apparent from the above description, the pre-compression of the molding sand by the thin plate is controlled in accordance with a predetermined insertion depth or insertion load value of the thin plate into the molding sand. Therefore, even if the pattern plate is made of a material having low strength, such as wood, the pattern plate can be formed without damaging the material, and the effect is remarkable.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention.

FIG. 2 is a view as viewed in the direction of arrows AA in FIG. 1;

FIG. 3 is a cross-sectional view showing another embodiment of the thin plate member.

FIG. 4 is a longitudinal sectional view showing another embodiment of the present invention.

FIG. 5 is a longitudinal sectional view showing still another embodiment of the present invention.

[Explanation of symbols]

 2 Hydraulic cylinder 3 Lifting table 4 Pattern plate 4A Pattern 5 Casting frame 10 Thin annular body 10A Plate 10B Pressing material 11 Displacement gauge 11A Load sensor 13 Controller 14 Hydraulic control valve S Casting sand

Claims (4)

[Claims] 1. A method according to claim 1, further comprising: preliminarily compressing molding sand in the vicinity of the inner and outer surfaces of the pattern of the pattern plate or in the vicinity of the inner surface of the molding frame including the molding sand which has been introduced into the space defined by the pattern plate and the molding flask. A method for preliminarily compressing molding sand in a mold molding in which the entire molding sand upper surface is pressed later, wherein a thin plate disposed in accordance with the pattern shape of the pattern plate is set in advance according to the pattern plate. A method of pre-compressing molding sand, characterized in that the molding sand is relatively inserted from above the molding sand toward the pattern plate until the insertion depth or insertion load value for the molding sand is reached. 2. The molding sand in the vicinity of the inner and outer surfaces of the pattern of the pattern plate or in the vicinity of the inner surface of the molding frame including the same is preliminarily compressed with respect to the molding sand introduced into the space defined by the pattern plate and the molding flask. A pre-compressing device for molding sand in a mold molding that presses the entire upper surface of the molding sand later, and is arranged above the elevating table 3 which can be moved up and down by the hydraulic cylinder 2, corresponding to the pattern 4A of the pattern plate 4. The provided thin plate body 10 is disposed so as to be able to move up and down relatively with respect to the elevating table 3, and a displacement meter 11 for measuring the displacement is connected to the elevating table 3 or the thin plate body 10. The hydraulic cylinder 2 is controlled by the controller 13 that transmits a signal for stopping the extension operation of the hydraulic cylinder 2 according to the set insertion depth of the thin plate member 10 into the casting sand S. A pre-compression device for molding sand, electrically connected to a hydraulic control valve 14. 3. The molding sand in the vicinity of the inner and outer surfaces of the pattern of the pattern plate or in the vicinity of the inner surface of the molding frame including the same is preliminarily compressed with respect to the molding sand introduced into the space defined by the pattern plate and the molding flask. A pre-compression device for molding sand in a mold molding that later presses the entire upper surface of the molding sand, wherein the pattern is formed on a lower surface of a frame 7 via a load sensor 11A above a lifting table 3 which can be raised and lowered by a hydraulic cylinder 2. The thin plate member 10 arranged corresponding to the pattern 4A of the plate 4 is disposed so as to be able to move up and down relatively to the elevating table 3, and the load sensor 11A is set to a predetermined molding sand S of the thin plate member 10. To a hydraulic control valve 14 of the hydraulic cylinder 2 via a controller 13 that transmits a signal for stopping the extension operation of the hydraulic cylinder 2 in accordance with an insertion load value for the hydraulic cylinder 2. A pre-compression device for molding sand, which is electrically connected. 4. The molding sand in the vicinity of the inner and outer surfaces of the pattern of the pattern plate or in the vicinity of the inner surface of the molding flask including the same is preliminarily compressed with respect to the molding sand introduced into the space defined by the pattern plate and the molding flask. A pre-compression device for molding sand in a mold molding that later presses the entire upper surface of the molding sand, wherein the pattern is formed on a lower surface of a frame 7 via a load sensor 11A above a lifting table 3 which can be raised and lowered by a hydraulic cylinder 2. A thin plate member 10 arranged corresponding to the pattern 4A of the plate 4 is arranged so as to be able to move up and down relatively to the elevating table 3, and the elevating table 3 is provided with a displacement gauge 11 for measuring the displacement thereof. The load sensor 11A and the displacement meter 11 are connected to each other to detect a signal that has reached a predetermined insertion load value or a signal that has reached an insertion depth dimension of the thin plate member 10 into the molding sand S. A molding sand electrically connected to a hydraulic control valve 14 of the hydraulic cylinder 2 via a controller 13 for transmitting a signal for stopping the extension operation of the hydraulic cylinder 2 by a signal detected earlier. Pre-compression device.