Method for casting double-end blind hole part at negative pressure through evanescent mode
A technology of negative pressure casting and lost foam, which is applied in the direction of casting molding equipment, casting molds, casting mold components, etc. It can solve the problems of sticking sand at the bottom, increasing the difficulty of operation, and scrapping castings, so as to reduce the workload.
Inactive Publication Date: 2016-05-04
JIANGSU GRINKA MACHINERY CO LTD
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Problems solved by technology
[0002] At present, in lost foam castings, double-ended blind holes occupy a certain proportion. When the diameter and depth of the blind holes at the lower end of the pouring position are relatively large (generally, the hole diameter is > 20mm, and the hole diameter: depth > 1) parts with bottom blind holes In the process of sand filling molding, the blind hole at the bottom is often not completely filled, resulting in the poured casting sand floating to the inside of the casting or defects such as sand sticking at the bottom, resulting in the scrapping of the casting or increasing the difficulty of the subsequent grinding work
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[0021] The part has two blind holes (eg figure 1 ), clusters (such as Figure 5 ) is placed into the sand box during the molding process, the bottom blind hole is not easy to fill.
[0022] Implementation steps:
[0023] 1. Prepare polyvinyl alcohol powder and water in a ratio of 1:1:8~11 to make glue for later use;
[0024] 2. Mix the sand (50~70 mesh), glue and cement evenly in the ratio of 100:9~10:3~6, and use the mold to make the mixed molding sand into the sand core of the required shape (such as Figure 4 As shown), put it on a flat plate to dry naturally for more than 36 hours or put it in a drying room at a temperature of 40~60°C for more than 24 hours;
[0025] 3. Coat the surface of the dried sand core with a layer of conventional paint, and then put it in a drying room at 40-60°C for drying;
[0026] 4. Bond the white mold shown in Figure (1) to the string shown in Figure (2) with lost foam hot melt adhesive;
[0027] 5. Assemble the completed white mold and t...
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The invention belongs to the technical field of machining models and relates to a method for casting a double-end blind hole part at negative pressure through an evanescent mode. The method is characterized in that blind holes are filled with self-hardening sand in advance, and the bottom blind hole is tamped in advance. According to the method, the problem of molding sand flying or casting sand burning caused by uncompacted sand filling of a bottom blind hole of a product can be effectively avoided, and the workload of sand removal in the next working procedure can be greatly relieved. The method is similarly suitable for evanescent mode casting production during which sand filling is not easy to carry out due to a large hole in the bottom.
Description
technical field [0001] The invention belongs to the technical field of processing models, and in particular relates to a method for lost foam negative pressure casting double-headed blind hole parts. Background technique [0002] At present, in lost foam castings, double-ended blind holes occupy a certain proportion. When the diameter and depth of the blind holes at the lower end of the pouring position are relatively large (generally, the hole diameter is > 20mm, and the hole diameter: depth > 1) parts with bottom blind holes In the process of sand filling molding, the blind hole at the bottom is often not completely filled, resulting in the poured casting sand floating to the inside of the casting or defects such as sand sticking at the bottom, resulting in the scrapping of the casting or increasing the difficulty of the subsequent grinding work . Contents of the invention [0003] The object of the present invention is to solve the above problems, and propose a m...
Claims
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IPC IPC(8): B22C9/04B22C9/24
CPCB22C9/04B22C9/24
Inventor 项恒新丁崇贵
Owner JIANGSU GRINKA MACHINERY CO LTD