JPH0428691Y2 - - Google Patents

Description

[Detailed explanation of the idea]

[Industrial Application Field] The present invention relates to a molten metal supply tool, and more particularly to a molten metal supply tool used for supplying molten metal to a mold in a low-pressure casting method or the like. [Prior art] In a casting method, for example, a low-pressure casting method in which molten metal is filled from a melting furnace into a mold through a sprue pipe placed below the mold and then solidified, if there is only one weir to the product cavity, the sprue pipe and weir are used. However, when installing multiple weirs to improve the flow of hot water to each part of the product and for the feeder, conventionally, as shown in Fig. 7,
A molten metal distribution device (manifold) 1 is used between the sprue pipe 3 and each weir 6. In addition, in the figure, 4 is a mold, and 5 is a product cavity. In addition, a manifold with a Y-shape according to the number of weirs on the outside is used, for example, in Japanese Patent Application Publication No.
It is disclosed in Japanese Utility Model Application Publication No. 55-24793 and Japanese Utility Model Application Publication No. 57-122762. [Problem that the invention aims to solve] However, inside the manifold, the temperature of the molten metal is not uniform just above the sprue pipe and at the end away from the sprue pipe. Although it is good, it is very difficult to solidify it in a short time. For example, in the case of the method shown in FIG. 7, the weir solidification tendency will be as shown in FIG. 8. That is, both sides in the figure become longer. If the casting time is shorter than this, the unsolidified molten metal in the product section above the central weir will fall out and cause a lack of thickness, and if it is too long, the molten metal will solidify from the end weir to the manifold, making it difficult to release the product from the mold. . Therefore, it is very difficult to set the timing for finishing casting, a long weir length is required, and the product yield is poor. Furthermore, since the cycle time depends on the final solidification of the weir, there arises the problem that the cycle time is longer than in a case where the weir is uniformly solidified. Furthermore, if you try to form a Y-shaped manifold, for example, the manifold will be complicated and expensive;
Uniform solidification becomes difficult in a manifold having more than 1 weir. The present invention is intended to solve the above-mentioned problems in the conventional technology, and its purpose is to uniformly solidify the molten metal in each weir after supplying the molten metal in the melting furnace to the mold having multiple weirs. The object of the present invention is to provide a molten metal supply tool that can improve cycle time and product yield. [Means for Solving the Problems] In other words, the molten metal supply tool of the present invention has a main body and a main body provided inside the body for simultaneously supplying molten metal in the melting furnace to a plurality of weirs provided in the mold. A molten metal supply tool consisting of a single diagonal plate for uniformizing the solidification length of the weir by dispersing the heat flow transmitted through the molten metal to multiple weirs, and the main body supplies the molten metal to the weir. It has one opening for connection to the melting furnace and one connection port to the melting furnace located opposite this opening, and the board is located on the axis connecting the center of the opening and the center of the connection port. It is characterized in that it is provided at a position approximately in the center of the main body. The size, shape, and other properties of the supply tool are selected depending on the properties of the mold and the number and arrangement of its weirs. The supply device may consist of a sprue and a manifold, or it may consist of only a sprue. The material may be, for example, the same as that of conventional sprue pipes, such as iron-based alloys. The diyama plate is provided to uniformize the temperature distribution of the molten metal in the supply tool during casting, and in particular to equalize the temperature of each weir, and its size, shape, and other properties are determined in order to achieve the above purpose. Optimally determined by thermal theoretical analysis or experimentally. The cross-sectional shape of the jiyama board is, for example, rectangular, convex on one side,
A convex shape on both sides or a combination of various shapes may be selected depending on the casting conditions such as the type of molten metal and the desired cycle time. Furthermore, openings such as holes and slits may be provided in the board to adjust the degree of heat transfer. It is advantageous to use the same material as the molten metal feeder main body, since it can be fixed to the wall of the main body by welding, but it is not particularly limited, and may be made of heat-resistant metal materials, heat-resistant inorganic materials such as ceramics, or the like. Select from composite materials, etc. It is preferable to provide a wall board of a size suitable for the predetermined position as described above. [Example] The present invention will be explained in more detail in the following example based on the drawings. Note that the present invention is not limited to the following examples. Embodiment 1: FIGS. 1 and 2 show an embodiment of the molten metal supply tool of the present invention when used in low pressure casting. Fig. 1 is a plan view of this supply tool as seen from the mold side, and Fig. 2 shows the supply tool connected to the mold and melting furnace (not shown) along line A-A in Fig. 1. FIG. In the figure, 1' is the manifold, 2 is the cutting board,
7 indicates the opening, and the other numbers have the same meanings as in FIG. In FIG. 2, the molten metal rising from the melting furnace through the sprue pipe 3 enters the manifold 1', and the opening 7 of the baffle plate 2 installed at an intermediate depth therebetween, and the baffle plate 2 and the manifold 1'. The product passes through the gap between the products and fills the product cavity 5 through the plurality of weirs 6, and solidifies. In this case, the size and shape of the weir, the size and shape of the opening, the installation depth of the weir, etc. were experimentally determined so that approximately the same amount of hot water would reach each weir 6 at the same time. A cylinder head was cast using AC2C aluminum alloy using the molten metal supply tool of the present invention. Experiment 1: Casting was performed at a pouring temperature of 700°C and a casting (solidification) time of 8 minutes. As a result, as shown in FIG. 3, the weir solidified portions 9 of the product 8 taken out had approximately the same length regardless of their position, indicating that they were uniformly solidified. In this experiment, the number of weir solidified parts n = 12, the average length (mm) = 75, and the standard deviation (mm) σ _{o -1} = 10. Experiment 2: Same method as Experiment 1, except that the pouring temperature was 700℃.
When cast with a solidification time of 9 minutes, n = 12, =
85, σ _o-1 = 12. Experiment 3: Same method as Experiment 1, except that the pouring temperature was 700℃.
When casting with a solidification time of 7 minutes, n=12,=
55, σ _o-1 =9. Comparative Example 1: A product similar to Example 1 was manufactured using the manifold 1 shown in Fig. 7 without a cutting board, and the pouring temperature was
When casting was carried out at 700℃ for 8 minutes, the product part was not solidified in the weir in the center, so it fell down after casting and there was a lack of thickness, and about 80 mm of solidified part of the weir remained at one end. . Comparative Example 2: Using a relatively similar method to 1, casting was performed at a pouring temperature of 700°C and a solidification time of 9 minutes and 30 seconds, resulting in a weir-solidified part as shown in Figure 8, with the part near the center being closer to the lower end of the product.
It was only 15 mm, and on the other hand, if the casting time was extended any longer at the weir at the end, the manifold would solidify and it would be difficult to release the product from the mold. In this case, n=
12, = 60, and σ _o-1 = 45. Embodiments 2 and 3: FIGS. 4 and 5 show the cross-sectional shape of the wall board of another embodiment of the molten metal supply tool of the present invention. In Fig. 4, the sprue pipe side (lower surface) is made convex, so that the air flowing into the molten metal has a displacement effect with the molten metal, and the molten metal flows easily, and in Fig. 5, the upper surface is also made convex, This is to prevent residual metal from remaining on the top of the cutting board at the end of casting. Both exhibit the same effects as Example 1, and can achieve the purpose of the present invention. The table below summarizes the results of the length of the weir solidified portion in Example 1 and Comparative Example 2.

[Effect of idea]

As mentioned above, the molten metal supply device of the present invention is equipped with a diagonal plate inside which uniformly disperses the heat transmitted through the molten metal from the sprue pipe side during casting to multiple weirs provided in the mold. It is possible to solidify the weir almost uniformly. Since the length of the weir solidification part of the product can be controlled by the casting time, it is easy to set casting conditions, and it is possible to solidify the product in a shorter time than before, reducing cycle time and product yield in the casting process. can be improved.

[Brief explanation of the drawing]

Fig. 1 is a plan view of a manifold portion of an embodiment of the molten metal supply tool of the present invention, and Fig. 2 is a plan view of the manifold portion of an embodiment of the molten metal supply tool of the present invention, and Fig. 2 shows the state in which the supply tool of Fig. 1 is connected to a mold and a melting furnace.
- A sectional view taken along line A; Figure 3 is a front view of an example of a product cast using the molten metal supply tool of the present invention; Figures 4 and 5 are other implementations of the molten metal supply tool of the present invention. FIG. 6 is a cross-sectional view showing the molten metal supply tool of the present invention connected to a mold according to another embodiment of the present invention, and FIG. 7 shows an example of the conventional molten metal supply tool with the mold and Sectional view showing the state connected to the sprue pipe, No. 8
The figure is a front view of an example of a product cast using a conventional molten metal feeder. In the diagram, 1, 1'...manifold, 2, 2', 2''
...Jiyama board, 3...Gate pipe, 4...Mold, 5...
...Product cavity, 6...Weir, 7...Opening, 8
...Product, 9...Weir solidification section.

Claims (1)

[Claim for Utility Model Registration] A main body and a device installed inside the body to simultaneously supply molten metal in the melting furnace to multiple weirs provided in the mold to disperse the heat flow transmitted from the melting furnace through the molten metal during casting to multiple weirs. This is a molten metal supply tool consisting of a single diagonal plate for uniformizing the solidification length of the weir by moving the molten metal to the weir, and the main body has one opening for supplying the molten metal to the weir and a It has a connecting port with one melting furnace located at an opposing position, and the jamb board is located approximately at the center of the main body on the axis connecting the center of the opening and the center of the connecting port. A molten metal supply tool characterized by: