Casting equipment

Abstract

To provide a casting apparatus that controls the solidification sequence in casting at low cost. [Solution] The casting apparatus 1 comprises a product section 11 which is a space in the mold for forming a casting product, a riser section 12 provided above the product section 11, and a cooling groove 13 provided below the riser section 12 and connected to both the product section 11 and the riser section 12, into which molten metal is injected. The cooling groove 13 is arranged in such a way that when the injected molten metal solidifies and promotes the solidification of the molten metal injected into the product section 11 and the riser section 12 located around the solidified area, it promotes solidification in the order of product section 11, the gap between the product section 11 and the riser section 12, and then the riser section 12.

Description

Technical Field

[0001] This disclosure relates to a casting apparatus.

Background Art

[0002] In sand casting, an iron material called a chill is embedded on the mold side to ensure the promotion of solidification of molten metal.

[0003] Patent Document 1 discloses a sand casting method of a vacuum chamber in which a chill is disposed at least at a lower end of a vacuum chamber-shaped space portion or a location corresponding to a side wall of the vacuum chamber in a sand mold, and pressing hot water is disposed on the upper part of the sand mold. In this method, a temperature gradient occurs from the location of the chill toward the pressing hot water method having a large heat capacity. Therefore, the solid-liquid coexistence region of the solidification interface moves along the temperature gradient, that is, directional solidification progresses.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] Generally, at the boundary between the pressing hot water portion and the product portion, solidification may not necessarily occur in the order from the product portion to the pressing hot water portion. Here, even when a chill is installed at the boundary to improve this order, solidification may occur first from the pressing hot water portion.

[0006] Furthermore, it was necessary to secure space in the mold to embed chills, and if the shape of the product or mold was complex, the chills had to be machined. In other words, there were problems with the difficulty of placing the chills and the increased costs associated with machining them. Therefore, there was a need for a method that could easily control the solidification sequence without using chills.

[0007] This disclosure provides a casting apparatus that controls the solidification sequence in casting at low cost. [Means for solving the problem]

[0008] The casting apparatus according to this disclosure comprises a product section, which is a space in a mold for forming a casting product; a riser section provided above the product section; and a cooling groove provided below the riser section and connected to both the product section and the riser section, into which molten metal is injected. The cooling groove is arranged in such a manner that when the injected molten metal solidifies and promotes the solidification of the molten metal injected into the product section and the riser section located around the solidified area, the solidification is promoted in the order of the product section, the gap between the product section and the riser section, and the riser section. This allows molten metal to be injected into cooling grooves in the mold and solidified, and the molten metal in the product area and riser area around the solidified area can be solidified sequentially. [Effects of the Invention]

[0009] This disclosure provides a casting apparatus that can control the solidification sequence in casting at low cost. [Brief explanation of the drawing]

[0010] [Figure 1] This is a side view of the casting apparatus. [Figure 2] This is a top view of the casting apparatus. [Figure 3] This is another side view of the casting apparatus. [Modes for carrying out the invention]

[0011] Embodiment 1 The casting apparatus according to this embodiment will now be described with reference to the drawings. Figure 1 is a side view showing the configuration of the casting apparatus 1, which is a mold.

[0012] The casting apparatus 1 comprises a product section 11 which is a space in the mold where a cast product is formed, a riser section 12 which is provided above the product section 11 and into which riser molten metal is injected, and a cooling groove 13 which is located between the product section 11 and the riser section 12 and is connected to both.

[0013] This specification can be applied to either low-pressure casting or gravity casting. Hereafter, we will refer to it as gravity casting. To explain further, the product section 11 is located at the bottom of the mold and is the space in the mold where the cast product is formed. The product is formed when the molten metal filled from the riser section 12 cools and solidifies. The product section 11 is connected to the riser section 12, and the product section 11 can be filled with molten metal by injecting it from the riser section 12.

[0014] Here, we will explain assuming that there is a trimming surface 11a near the top of the product part 11, as shown in Figure 1.

[0015] The riser section 12 is a space located above the product section 11 into which the riser is injected. The lower part of the riser section 12 and the upper part of the product section 11 are connected by their respective spaces. Therefore, the molten metal flows into the product section 11 by being injected into the riser section 12.

[0016] The cooling groove 13 is located below the riser portion 12 and above the trimming surface 11a of the product portion 11, and is connected to the space between both the riser portion 12 and the product portion 11.

[0017] Here, Figure 2 is a top view showing the configuration of the casting apparatus 1, and Figure 3 is a side view shown from a viewpoint 90° different from that of Figure 1.

[0018] As shown in FIGS. 2 and 3, it is assumed that three cooling grooves 13 are formed to extend in parallel below the hot water pressing part 12 in the casting device 1. Typically, the number of cooling grooves 13 can be changed according to the size of the hot water pressing part 12. That is, the cooling groove 13 provided in the casting device 1 may be one, or any plurality of two or more.

[0019] Here, when a plurality of cooling grooves 13 are used, it is assumed that at least a part of each of them is in contact with the hot water pressing part 12 and the product part 11. Typically, the state where the cooling groove 13 is in contact with the hot water pressing part 12 and the product part 11 means that the molten metal injected into the cooling groove 13 is in contact with the molten metal injected into the hot water pressing part 12 and the product part 11 in a state where solidification has progressed first.

[0020] Next, an example of the operation in the casting device 1 will be described. In the casting device 1, the product part 11, the hot water pressing part 12, and the cooling groove 13 are formed in advance.

[0021] First, molten metal is injected into the hot water pressing part 12. As a result, the product part 11 is filled with the molten metal inserted from the hot water pressing part 12. That is, the molten metal is filled above the replacement surface 11a of FIG. 1 in the product part 11 and also accumulates in the hot water pressing part 12.

[0022] Also, the cooling groove 13 is filled with molten metal injected therein. Here, since the cooling groove 13 provided in the mold is in the shape of a groove extending in a predetermined direction, the area in contact with the mold is large, and solidification starts earlier than the molten metal injected into the hot water pressing part 12 and the product part 11.

[0023] At this time, in the cooling groove 13, the molten metal, which is cooled and solidified earlier due to the larger contact area with the mold, will be at a lower temperature compared to the surrounding area. In other words, the area where the molten metal solidifies in the cooling groove 13 will be at a lower temperature than the molten metal injected into the riser section 12 and the product section 11, thus promoting chain reaction solidification.

[0024] Furthermore, the temperature of the solidified molten metal in the cooling groove 13 is higher than when a chill is used. Therefore, by utilizing the molten metal injected into the cooling groove 13, it becomes easier to control the cooling of the molten metal in the product section 11 and the riser section 12.

[0025] Specifically, the cooling groove 13 promotes the chain reaction of solidification of the surrounding area in response to the solidification of the injected metal, thereby controlling the order in which the molten metal solidifies at each location: the product portion 11, the gap between the solidified and shrunk product portion 11 and the riser portion 12, and then the riser portion 12.

[0026] In other words, the cooling groove 13 can be configured to promote the solidification of the molten metal injected into the product section 11 and riser section 12 located around the solidified area, in the order of solidification of the product section 11, the gap between the product section 11 and the riser section 12, and then the riser section 12.

[0027] Based on the above, the casting apparatus 1, which is the mold, can have the cooling grooves 13 pre-applied to it. This allows the molten metal injected into the cooling grooves 13 to be used as a coolant even in areas of the mold that are uneven or curved, where it is difficult to place chills. In this case, there is also the advantage that there is no need to build up the thickness of the product part 11.

[0028] Furthermore, when using chills in a mold, there is a possibility that the chills may shift. However, in casting apparatus 1, cooling grooves 13 are provided in the mold, so there is no need to worry about shifting.

[0029] It should be noted that the present invention is not limited to the embodiments described above, and can be modified as appropriate without departing from the spirit of the invention. In other words, the above description has been omitted and simplified as appropriate for the sake of clarity, and those skilled in the art can easily change, add, and modify each element of the embodiments within the scope of the present invention.

[0030] For example, although the above description assumes that the multiple cooling grooves 13 are formed in the mold so as to extend in a predetermined direction, particularly horizontally and linearly, the shape is not limited to this. That is, the shape of the cooling grooves 13 can be any shape depending on the shape of the product part 11 and the shape of the area between the product part 11 and the riser part 12. [Explanation of symbols]

[0031] 1. Casting apparatus 11 Product Department 11a Cutting surface 12. Pressed Hot Spring Section 13 Cooling groove

Claims

[Claim 1] In a mold, the product section is the space in which the cast product is formed, A pressing section is provided above the aforementioned product section, It is provided below the riser section and connected to both the product section and the riser section, and includes a cooling groove into which molten metal is injected, The cooling groove is When the injected molten metal solidifies and promotes the solidification of the molten metal injected into the product portion and the riser portion, which are positioned around the solidified area, the solidification is promoted in the following order: the product portion, the gap between the product portion and the riser portion, and the riser portion. Casting apparatus.

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