Casting core mounting structure

Abstract

This invention provides a core mounting structure for casting that can hold the core in a predetermined position with high precision. [Solution] The casting core mounting structure 100 according to the present disclosure is for mounting a casting core 20 to a mold 10, wherein a mounting portion 21 provided on the casting core 20 is passed through a mounting hole 11 provided on the mold 10, a suspended core 30 is fitted into a protruding portion 22 of the mounting portion 21 from the mounting hole 11, and the inorganic mixed sand 40 poured between the suspended core 30 and the protruding portion 22 is hardened to hold the casting core 20 in a predetermined position within the mold 10.

Description

Technical Field

[0001] The present disclosure relates to an attachment structure for a core for casting.

Background Art

[0002] When forming a casting having a complex shape, a core for casting may be attached in a casting mold. For example, in Patent Document 1, a mounting portion provided protruding from a core for casting is passed through a mounting hole provided in a mold, and an elastic member is fitted to a protruding portion of the mounting portion from the mounting hole, thereby holding the core at a predetermined position in the mold. A technique is disclosed.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The inventors have found the following problems regarding the attachment structure of the core for casting. In Patent Document 1, a core for casting is held at a predetermined position using an elastic member. In the technique disclosed in Patent Document 1, it is premised that the same elastic member is repeatedly used. However, when the elastic member is repeatedly used, the force for holding the core for casting decreases due to deformation and wear. Further, since the temperature in the vicinity of the elastic member rises when the molten metal enters the mold during casting, when casting is repeatedly performed, the temperature rise and fall of the elastic member are repeated, and the clamping force of the elastic member decreases. Therefore, when the elastic member is repeatedly used, there is a risk that the core for casting may fall or the position of the core for casting may shift. That is, there is room for improvement in order to improve the accuracy of the predetermined position for holding the core for casting.

[0005] This disclosure has been made in view of these challenges and aims to provide a mounting structure for a casting core that can hold the casting core in a predetermined position with high precision. [Means for solving the problem]

[0006] One embodiment for achieving the above objective is: A casting core mounting structure for attaching a casting core to a mold, The mounting portion provided on the casting core is passed through a mounting hole provided in the mold, the hanging core is fitted into the protruding portion of the mounting portion from the mounting hole, and the inorganic mixed sand poured between the hanging core and the protruding portion is hardened to hold the casting core in a predetermined position within the mold. [Effects of the Invention]

[0007] According to this disclosure, it is possible to provide a casting core mounting structure that can hold the casting core in a predetermined position with high precision. [Brief explanation of the drawing]

[0008] [Figure 1] This is a schematic cross-sectional view showing an example of the configuration of a casting core mounting structure according to an embodiment. [Modes for carrying out the invention]

[0009] The embodiments of this disclosure will be described in detail below with reference to the drawings. In each drawing, the same or corresponding elements are denoted by the same reference numerals, and redundant explanations are omitted where necessary for clarity. Also, for ease of understanding, the scale of each part in the drawings may differ from that of actual parts.

[0010] Figure 1 is a schematic cross-sectional view showing an example of the configuration of a casting core mounting structure 100 according to an embodiment. The mounting structure 100 is a structure for attaching a casting core 20 to a mold 10. The mold 10 is used to form a casting of a predetermined shape by pouring molten metal into it. The mold 10 is provided with a mounting hole 11. The mounting hole 11 is a through hole that penetrates the mold 10. The mounting hole 11 is provided at the location where the casting core 20 is to be attached. The shape of the mounting hole 11 is not particularly limited, but for example, as shown in Figure 1, the side into which the molten metal is poured may be a thick wedge shape or the like. Also, the cross-sectional shape of the mounting hole 11 is not particularly limited, and for example, it may be circular or rectangular.

[0011] The casting core 20 is placed inside the mold 10 to form parts of the casting that have a complex shape. The casting core 20 is a thermosetting inorganic core. A thermosetting inorganic core is a component made using inorganic compounded sand. Inorganic compounded sand is made by compounding inorganic sand, water glass, a surfactant, and water, and is hardened by firing at a temperature above a predetermined level. One casting method using thermosetting inorganic cores is the CS core process (Clean & Smooth / Circulation Sand Core Process). The mold, including the mold 10 and the casting core 20, is suitable for forming aluminum castings using the CS core process. In the CS core process, an inorganic substance is used instead of an organic substance as an adhesive, and a casting core 20 with a complex shape can be formed. Furthermore, as will be described in detail later, the sand used to form the casting core 20 can be reused in the CS core process.

[0012] The casting core 20 is provided with a mounting portion 21 on the side that contacts the mold 10. The mounting portion 21 is a projection that extends from the side that contacts the mold 10 toward the mold 10. The length of the mounting portion 21 in the projection direction is longer than the thickness of the mold 10, i.e., the dimension of the mounting hole 11 in the through direction. The mounting portion 21 is fitted into the mounting hole 11 as shown in Figure 1. The shape of the mounting portion 21 is not particularly limited as long as it can be fitted into the mounting hole 11, but for example, as shown in Figure 1, it may have a wedge shape with a narrow tip.

[0013] Since the length of the mounting portion 21 in the protruding direction is longer than the thickness of the mold 10, i.e., the dimension of the mounting hole 11 in the through direction, the tip of the mounting portion 21 protrudes outside the mounting hole 11 when fitted into the mounting hole 11. Hereinafter, the tip of the mounting portion 21 that protrudes outside the mounting hole 11 will be referred to as the protruding portion 22. A suspension core 30 is fitted into the protruding portion 22. The suspension core 30 is a component made using inorganic mixed sand, similar to the casting core 20. A through hole 31 is provided in the suspension core 30. The protruding portion 22 is fitted into the through hole 31. As shown in Figure 1, the through hole 31 is shaped in such a way that a gap is created between the suspension core 30 and the protruding portion 22. That is, the through hole 31 provided in the suspension core 30 is provided with dimensions larger than the protruding portion 22 in at least a part of it.

[0014] Inorganic mixed sand 40 is poured into the gap between the suspended core 30 and the protruding portion 22 and hardened. As the inorganic mixed sand 40 hardens, the suspended core 30 and the protruding portion 22 are bonded together. The inorganic mixed sand 40 is the same inorganic mixed sand that constitutes the casting core 20 and the suspended core 30. With the casting core 20 held inside the mold 10, a casting process is carried out in which molten metal is poured into the mold 10 and cooled. When the casting process is completed, the casting core 20, which is embedded in the casting, is removed from the mold 10. At this time, the casting core 20 is broken into pieces small enough to be removed, for example, by breaking off the protruding portion 22. Inside the casting from which the mold 10 has been removed, the casting core 20 is further crushed into sand-like material and then reused as inorganic sand.

[0015] Since the neutron for casting 20, the hanging neutron 30, and the inorganic mixed sand 40 are composed of the same material, the hanging neutron 30 and the inorganic mixed sand 40 can be reused as inorganic sand together with the neutron for casting 20. Therefore, the amount of waste can be reduced. Also, when removing the neutron for casting 20 from the mold 10, there is no need to separate the hanging neutron 30 and the inorganic mixed sand 40. Therefore, the work required for removing the neutron for casting 20 can be simplified. Further, new hanging neutrons 30 and inorganic mixed sands 40 are used each time the neutron for casting 20 is attached. Therefore, the hanging neutron 30 and the inorganic mixed sand 40 can hold the neutron for casting 20 at a predetermined position without being affected by deterioration or damage caused by repeated use. Thus, the attachment structure 100 of the neutron for casting according to the present disclosure can hold the neutron for casting 20 at a predetermined position with high accuracy.

[0016] In the example shown in FIG. 1, the case where one attachment portion 21 is provided for one neutron for casting 20 has been described. However, the number of attachment portions provided for one neutron for casting is not particularly limited, and two or more may be provided. Also, the shapes of the mold 10 and the neutron for casting 20 shown in FIG. 1 are examples, and they are appropriately changed according to the shape of the casting to be formed.

[0017] Note that the present disclosure is not limited to the above-described embodiments, and can be appropriately changed without departing from the gist.

Explanation of Reference Numerals

[0018] 10 Mold 11 Attachment Hole 20 Neutron for Casting 21 Attachment Portion 22 Protruding Portion 30 Hanging Neutron 31 Through Hole 40 Inorganic Mixed Sand 100 Attachment Structure

Claims

[Claim 1] A casting core mounting structure for attaching a casting core to a mold, The mounting portion provided on the casting core is passed through a mounting hole provided in the mold, the hanging core is fitted into the protruding portion of the mounting portion from the mounting hole, and the inorganic mixed sand poured between the hanging core and the protruding portion is hardened to hold the casting core in a predetermined position within the mold. Mounting structure for casting cores.

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