Neutron manufacturing apparatus and neutron manufacturing method

Abstract

To prevent falling of a core during releasing without rotating a molding die.SOLUTION: A core manufacturing apparatus 1 includes a cavity 13, a molding die 10 having a through hole 14 passing toward the cavity 13, and an extrusion pin 22 which releases a core W from the molding die 10 in a state of inserted into the through hole 14, making a tip bite into an excess thick part of the core W molded by the cavity 13 and holding the core W. The molding die 10 is such a vertical split mold that a parting line extends in a vertical direction, and the extrusion pin 22 is moved to a horizontal direction vertical to the vertical direction.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a core manufacturing apparatus, a core manufacturing method, and a core. [Background technology]

[0002] A casting core is produced by filling a mold with raw materials including sand and a binder such as resin or water glass. An ejector pin is used to release the produced core from the mold (see, for example, Patent Document 1). The ejector pin is placed in a through-hole that penetrates the mold toward the cavity, and ejects the produced core to release it from the mold.

[0003] In Patent Document 1, after a cavity formed by the recesses of an upper mold and a lower mold is filled with raw material to form a core, the upper mold and the lower mold are separated, and multiple ejector pins inserted into multiple through holes provided in the recess of the lower mold are raised. As a result, the core in the recess of the lower mold is pushed up and supported above the lower mold by the multiple ejector pins. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2017-140646 Summary of the Invention [Problem to be solved by the invention]

[0005] In Patent Document 1, the molded core is pushed up from below by multiple ejector pins that move up and down in the same direction as the direction of gravity, and is held on the tips of the multiple ejector pins. For this reason, if the mold is a vertically split mold in which the parting line extends vertically (in the direction of gravity), the mold must be rotated to hold the core and prevent it from falling.

[0006] Installing a rotation mechanism to rotate the mold in core manufacturing equipment raises issues such as increased costs, increased equipment space, and worsened maintenance and cleaning workability due to the increased number of mechanical parts.

[0007] The present invention has been made in consideration of these problems, and an object of the present invention is to provide a core manufacturing apparatus, a core manufacturing method, and a core that can prevent the core from falling during demolding without rotating the molding die. [Means for solving the problem]

[0008] A core manufacturing apparatus according to a first aspect of the present invention comprises a molding die having a cavity and a through hole that penetrates toward the cavity, and an ejector pin that is inserted into the through hole and releases the core from the molding die while holding the core by inserting its tip into the excess material of the core formed by the cavity.

[0009] In the core manufacturing apparatus according to the second aspect of the present invention, the forming mold is a vertically split mold with a parting line extending in the vertical direction.

[0010] In the core manufacturing apparatus according to the third aspect of the present invention, the ejector pin moves in a horizontal direction perpendicular to the vertical direction.

[0011] A core manufacturing method according to a fourth aspect of the present invention involves forming a core using a mold having a cavity and a through hole that penetrates toward the cavity, and after the mold is opened, using an ejector pin inserted into the through hole to insert the tip of the ejector pin into the excess material portion of the core to hold the core in place, and then releasing the core from the mold.

[0012] A core according to a fifth aspect of the present invention is formed using a mold having a cavity and a through hole that penetrates toward the cavity, and has an excess material portion into which the tip of an ejector pin inserted into the through hole bites and holds when the core is released from the cavity. [Effects of the Invention]

[0013] According to the present invention, it is possible to provide a core manufacturing apparatus, a core manufacturing method, and a core that can prevent the core from falling during demolding without rotating the molding die. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a schematic cross-sectional view showing a part of the configuration of a core manufacturing apparatus according to an embodiment. [Figure 2] FIG. 2 is a view showing the state after the forming mold has been opened in the core manufacturing apparatus of FIG. 1. [Figure 3] 1. FIG. 4 is a diagram showing a state when the core is released from the mold by an ejector pin in the core manufacturing apparatus of FIG. [Figure 4] FIG. 4 is an enlarged view of a part of FIG. 3. [Figure 5] FIG. 5 is a diagram showing the state in which the core of FIG. 4 is held by an ejector pin after being released from the mold. DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. For clarity of explanation, the following description and drawings have been omitted and simplified as appropriate. Furthermore, in each drawing, the same elements are given the same reference numerals, and duplicate explanations are omitted as necessary. In each drawing, the up-down direction is the direction of gravity (vertical direction), and the left-right direction is the direction perpendicular to the direction of gravity (horizontal direction). The xyz coordinate system shown in FIG. 1 is for convenience in explaining the positional relationship of the components. The +z axis direction is vertically upward, and the xy plane is the horizontal plane. The right side of the drawing is the +x direction.

[0016] Fig. 1 is a schematic cross-sectional view showing part of the configuration of a core manufacturing apparatus 1 according to an embodiment. Fig. 2 is a view showing the state after molding die 10 has been opened in core manufacturing apparatus 1 of Fig. 1, and Fig. 3 is a view showing the state when core W is released by ejector pin 22. That is, Figs. 1 to 3 are cross-sectional views of manufacturing steps that explain the method for manufacturing a core according to an embodiment.

[0017] As shown in Figure 1, core manufacturing apparatus 1 includes a molding die 10 and an extrusion mechanism 20. Core manufacturing apparatus 1 is an apparatus that fills a cavity formed by molding die 10 with core raw materials such as core sand and heats the raw materials to form a core W.

[0018] The molding die 10 is, for example, a vertically split mold with a parting line extending in the vertical direction (z direction). The molding die 10 includes a movable die 11 and a fixed die 12 that face each other. By moving the movable die 11 in a direction approaching the fixed die 12 and clamping the mold, a cavity 13 for forming the core W is formed by the recesses of the movable die 11 and the fixed die 12. In FIG. 1, the shape of the cavity 13 is shown to have a rectangular cross section for convenience, but of course the shape will be adjusted to match the shape of the core to be molded.

[0019] The fixed mold 12 has a through hole 14 that penetrates toward the cavity 13. The through hole 14 is a hole in which an ejector pin 22 is placed to push the shaped core out of the fixed mold 12 and release it from the mold. The through hole 14 has approximately the same diameter as the ejector pin 22. In the case of a vertically split molding die 10, the through hole 14 is formed to extend in the horizontal direction (x direction). Note that the through hole 14 may be formed in either the movable mold 11 or the fixed mold 12.

[0020] The ejection mechanism 20 includes an ejection plate 21 and ejection pins 22. The ejection plate 21 is a flat member and is arranged on a plane parallel to the yz plane. A plurality of ejection pins 22 are arranged at predetermined intervals on the ejection plate 21. The ejection pins 22 are rod-shaped members for pushing the core formed in the cavity 13 out of the fixed mold 12. Here, three ejection pins 22 extending in the x direction are arranged side by side in the z direction.

[0021] The ejector pin 22 is positioned within the through hole 14 from its tip to its middle section, and is positioned outside the through hole 14 from its middle section to the connection section connected to the ejector plate 21. In this state, a core is formed, and the movable die 11 is moved in the +x direction as shown in Figure 2 to open the forming die 10. Thereafter, the ejector plate 21 is moved in the +x direction, and the tip of the ejector pin 22 protrudes from the opening on the cavity 13 side of the through hole 14, pushing the formed core W out of the fixed die 12 and releasing it from the mold.

[0022] Figure 4 is an enlarged view of a portion of Figure 3. As shown in Figure 4, the tip of the ejector pin 22 bites into the core W by a depth d. The depth d of the bite of the ejector pin 22 into the core W can be set to a depth that allows the tip of the ejector pin 22, which has bitten into the excess material portion of the core, to hold the core W when the core W is released from the molding die 10. In other words, the core W has excess material portion into which the tip of the ejector pin 22 bites and is held when the core W is released from the cavity 13 by the ejector pin 22 inserted into the through hole 14. For example, if there are 24 ejector pins and the depth d of the bite of the ejector pins 22 into the core W is 2 mm, a core W weighing approximately 8 kg can be held.

[0023] Figure 5 is a diagram showing the state in which the core W of Figure 4 is held by the ejector pin 22 after release from the mold. By having the ejector pin 22 bite into the core W in this way, even if the ejector pin 22 moves in a horizontal direction perpendicular to the direction of gravity, the core W can be held without dropping. This makes it possible to remove the core W from the molding die 10 without rotating it, even if the molding die 10 is a vertical split mold with a parting line in the vertical direction.

[0024] As explained above, in the core manufacturing apparatus 1 according to the embodiment, when the ejector pin 22 releases the core W from the mold 10, the core W is not simply held on the ejector pin, but the tip of the ejector pin 22 can be inserted into the excess material portion of the core W. This makes it possible to hold the core W even with the ejector pin 22 moving in a direction perpendicular to the vertical direction.

[0025] The present invention is not limited to the above-described embodiment, and modifications can be made as appropriate without departing from the spirit of the present invention. The embodiment can also be applied to cases where the two molds constituting the molding die 10 are horizontally split molds in which the parting line extends horizontally. That is, when multiple ejector pins inserted into multiple through-holes in the lower mold are raised to push the core up above the lower mold and support it, the tips of the ejector pins 22 may be embedded in the core W. This allows the core W to be held more stably. [Explanation of symbols]

[0026] 1 Core manufacturing equipment 10 mold 11 Movable type 12 Fixed type 13 Cavity 14 Through holes 15 Extra meat part 20 Extrusion mechanism 21 Extrusion plate 22 ejector pin W core

Claims

1. a molding die having a cavity and a plurality of through holes extending into the cavity; a plurality of ejector pins that are inserted into the plurality of through holes, respectively, and release the core from the molding die while holding the core by inserting their tips into a plurality of excess material portions of the core formed by the cavity; a pusher plate on which the plurality of ejector pins are arranged at predetermined intervals over an area facing the surface of the core on the side of the ejector plate, and which is arranged on a plane facing the surface across the molding die; Equipped with the ejector pin has a uniform diameter from a connection portion connected to the ejector plate to a tip portion thereof, The plurality of excess pad portions are formed so as to extend from the surface toward the pusher plate. Core manufacturing equipment.

2. The mold is a vertically split mold in which a parting line extends vertically. The core manufacturing apparatus according to claim 1.

3. The ejector pin moves in a horizontal direction perpendicular to the vertical direction. The core manufacturing apparatus according to claim 2.

4. The core is pushed out from the molding die by the tip surface of the ejector pin that is biting into the excess material portion, The core is held by a side surface of the ejector pin that is bitten into the excess material portion. The core manufacturing apparatus according to claim 3.

5. An extrusion plate, which is arranged at predetermined intervals across an area facing the surface of the extrusion plate side of the core on which a plurality of extrusion pins are formed, is placed on a plane facing said surface, sandwiching the molding die; a core is formed using the molding die having a cavity and a plurality of through holes penetrating toward the cavity, and a plurality of excess pad portions are formed so as to extend from the surface toward the extrusion plate; After the molding die is opened, the core is released from the molding die in a state where the ejector pins, which are inserted into the plurality of through holes and have the same diameter from the connection portion connected to the ejector plate to the tip portion, are inserted into the plurality of through holes, and the tip portions of the ejector pins are respectively inserted into the plurality of excess pad portions to hold the core. Core manufacturing method.

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