Mounting structure of mold core for casting

Abstract

The present invention addresses the problem of providing a mounting structure for a casting core capable of holding a core at a predetermined position with high precision. The mounting structure for a casting core according to the present invention mounts the casting core on a mold, and in the mounting structure for the casting core, a mounting part provided on the casting core is passed through a mounting hole provided on the mold, and a hanging core is fitted into a protruding portion of the mounting part from the mounting hole. And the inorganic mixed sand poured between the hanging core and the protruding part is solidified, so that the casting core is kept at a specified position in the casting mold.

Description

Technical Field

[0001] This invention relates to an mounting structure for a casting core. Background Technology

[0002] In cases where castings are to be formed into complex shapes, casting cores are sometimes installed inside the casting mold.

[0003] For example, Patent Document 1 discloses a technique in which a mounting portion protruding from a casting core passes through a mounting hole provided on a mold, and an elastic member engages with the protruding portion of the mounting portion from the mounting hole, thereby holding the core in a predetermined position within the mold.

[0004] Patent Document 1: Japanese Patent Application Publication No. 7-60400 Summary of the Invention

[0005] The inventors discovered the following issues regarding the mounting structure of the casting core.

[0006] In Patent Document 1, an elastic member is used to hold the casting core in a predetermined position. The technology disclosed in Patent Document 1 relies on the repeated use of the same elastic member. However, if the elastic member is used repeatedly, the force holding the casting core decreases due to deformation and wear. Furthermore, since the temperature near the elastic member rises as molten metal enters the mold during casting, repeated heating and cooling of the elastic member reduces its clamping force. Therefore, repeated use of the elastic member may result in the casting core falling off or shifting in its position. In other words, there is room for improvement in the accuracy of holding the casting core in the predetermined position.

[0007] The present invention was made in view of this problem, and its object is to provide a mounting structure for a casting core that can hold a casting core in a specified position with high precision.

[0008] One way to achieve the above objective is a casting core mounting structure that mounts the casting core onto a mold. In this casting core mounting structure,

[0009] The mounting portion provided on the casting core passes through the mounting hole provided on the mold, so that the lifting core is fitted with the protruding part of the mounting portion from the mounting hole, and the inorganic mixed sand poured between the lifting core and the protruding part is cured, thereby holding the casting core in a predetermined position within the mold.

[0010] Invention Effects

[0011] According to the present invention, a mounting structure for a casting core that can hold a casting core in a predetermined position with high precision can be provided. Attached Figure Description

[0012] Figure 1 This is a schematic cross-sectional view showing a structural example of the mounting structure for the casting core according to the embodiment. Detailed Implementation

[0013] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same or corresponding elements are labeled with the same symbols, and repeated descriptions are omitted as needed for clarity. Furthermore, for ease of understanding, the dimensions of the parts in the drawings may sometimes differ from the actual dimensions.

[0014] Figure 1 This is a schematic cross-sectional view showing a structural example of the mounting structure 100 for a casting core according to the embodiment. The mounting structure 100 is a structure for mounting a casting core 20 onto a mold 10. Molten metal is poured into the mold 10 to form a casting of a predetermined shape. A mounting hole 11 is provided on the mold 10. The mounting hole 11 is a through hole penetrating the mold 10. The mounting hole 11 is provided at the location where the casting core 20 is to be mounted. The shape of the mounting hole 11 is not particularly limited; for example, as shown... Figure 1 As shown, the side into which the molten metal is injected can be a coarse wedge shape, etc. Furthermore, the cross-sectional shape of the mounting hole 11 is not particularly limited; for example, it can be circular or rectangular.

[0015] A casting core 20 is disposed within the mold 10 to form complex-shaped parts of the casting. The casting core 20 is a thermosetting inorganic core. Thermosetting inorganic cores are components made using inorganic mixed sand. Inorganic mixed sand is a mixture of inorganic sand, water glass, surfactant, and water, which is cured by calcination at a specified temperature or higher. As a casting method using thermosetting inorganic cores, there is the CS core process, which is a Clean & Smooth / Circulation Sand Core Process. The mold, including the mold 10 and the casting core 20, is suitable for forming aluminum castings based on the CS core process. In the CS core process, inorganic substances are used instead of organic substances as binders, enabling the formation of casting cores 20 with complex shapes. While details will be described later, the sand used to form the casting core 20 can be reused in the CS core process.

[0016] A mounting portion 21 is provided on the side of the casting core 20 that contacts the mold 10. The mounting portion 21 is a protrusion extending from the side contacting the mold 10 towards the mold 10. 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 through hole 11. Figure 1As shown, the mounting part 21 is inserted into the mounting hole 11. The shape of the mounting part 21 is not particularly limited as long as it can be inserted into the mounting hole 11; for example, as shown... Figure 1 As shown, it can be a wedge shape with a narrower front end.

[0017] Because the length of the protruding part 21 is longer than the thickness of the mold 10, i.e., the through-hole dimension of the mounting hole 11, the front end of the mounting part 21 protrudes outward from the mounting hole 11 when it is embedded in the mounting hole 11. Hereinafter, the front end of the mounting part 21 that protrudes outward from the mounting hole 11 will be referred to as the protruding part 22. A lifting core 30 is fitted onto the protruding part 22. The lifting core 30 is a component made of inorganic mixed sand, similar to the casting core 20. A through-hole 31 is provided on the lifting core 30. The protruding part 22 is embedded into the through-hole 31. Figure 1 As shown, the through hole 31 is shaped to create a gap between the lifting core 30 and the protruding portion 22. That is, the through hole 31 provided in the lifting core 30 is provided with a size larger than that of the protruding portion 22 in at least a portion.

[0018] Inorganic mixed sand 40 is poured into the gap between the hanging core 30 and the protruding part 22 and allowed to solidify. The solidification of the inorganic mixed sand 40 bonds the hanging core 30 and the protruding part 22 together. The inorganic mixed sand 40 is the same inorganic mixed sand that constitutes the casting core 20 and the hanging core 30. While the casting core 20 remains inside the mold 10, a casting process is performed where molten metal is poured into the mold 10 and cooled. After the casting process is complete, the casting core 20, which is encased in the casting, is removed from the mold 10. At this time, the casting core 20 is broken into a removable size, for example, by breaking off the protruding part 22, and then removed. Inside the casting removed from the mold 10, the casting core 20 is further processed into sand-like particles and then reused as inorganic sand.

[0019] Since the casting core 20, the hanging core 30, and the inorganic mixed sand 40 are all made of the same material, the hanging core 30 and the inorganic mixed sand 40 can be reused together with the casting core 20 as inorganic sand. Therefore, the amount of waste can be reduced. Furthermore, when removing the casting core 20 from the mold 10, it is not necessary to separate the hanging core 30 and the inorganic mixed sand 40. Therefore, the operation required for removing the casting core 20 can be simplified. Moreover, each time the casting core 20 is installed, a new hanging core 30 and inorganic mixed sand 40 are used. Therefore, the hanging core 30 and the inorganic mixed sand 40 can install and hold the casting core 20 in a designated position without being affected by deterioration or damage caused by repeated use of the hanging core 30 and the inorganic mixed sand 40. Thus, the casting core mounting structure 100 according to the present invention can hold the casting core 20 in a designated position with high precision.

[0020] exist Figure 1 In the example shown, the case where one mounting part 21 is provided relative to one casting core 20 has been described. However, there is no particular limitation on the number of mounting parts provided relative to one casting core, and more than two can be provided. Furthermore, Figure 1 The shapes of the mold 10 and the casting core 20 shown are examples and can be appropriately changed according to the shape of the casting to be formed.

[0021] Furthermore, the present invention is not limited to the above-described embodiments and can be appropriately modified without departing from the spirit of the invention.

[0022] Symbol Explanation

[0023] 10-Mold, 11-Mounting hole, 20-Casting core, 21-Mounting part, 22-Protruding part, 30-Hanging core, 31-Through hole, 40-Inorganic mixed sand, 100-Mounting structure.

Claims

1. An installation structure for a casting core, characterized in that, The casting core is installed on the mold, in the mounting structure of the casting core. The mounting portion provided on the casting core passes through the mounting hole provided on the mold, so that the lifting core is fitted with the protruding part of the mounting portion from the mounting hole, and the inorganic mixed sand poured between the lifting core and the protruding part is cured, thereby holding the casting core in a predetermined position within the mold.

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