Casting method for internal thread on large casting
A large-scale casting, internal thread technology, applied in the direction of rotors, cylinders, heat exchange equipment, etc., can solve the problems of waste of manpower, material resources and high cost
Inactive Publication Date: 2019-11-08
SHENGRUI TRANSMISSION
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Problems solved by technology
However, the casting of internal threads on large castings in the prior art still has the disadvantage of high cost
Figure 7-Figure 9 It is a view of a large casting 1. The weight of this piece is about 500Kg. There are two threaded holes 11 on the upper surface of the casting and one threaded hole on the side surface. It will cause a lot of waste of manpower and material resources
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[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0029] like figure 1 , figure 2 , image 3 and Figure 4 As shown, a casting method of internal threads on large castings, such as Figure 6 As shown, when the internal thread is located on the upper surface and / or the lower surface of the casting 1, the casting mold is first prepared, and the casting mold 10 is provided with a preform positioning hole 2, and the preform 3 has a threaded hole 4; then proceed as follows step:
[0030] The first step: molding,...
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The invention relates to a casting method for an internal thread on a large casting. When the internal thread is located on the upper surface and / or the lower surface of the casting, a casting mold isfirst prepared, a preform positioning hole is formed in the casting mold, and a preform has a threaded hole. Then the following steps are performed: step one. molding, screwing a bolt into the threaded hole of the preform, placing the preform into the preform positioning hole, after molding, the preform is located inside a sand mold cavity, and the outer end of the bolt is located in molding sand; and step two. casting, screwing out the bolt after the casting is completed. Through the above steps, the preform having the threaded hole is cast integrally with the casting, so that the casting has the internal thread thereon, and the casting precision and efficiency of the internal thread on the large casting can be effectively improved.
Description
technical field [0001] The invention relates to a method for casting internal threads in castings. Background technique [0002] In recent years, my country's industrialization process has deepened and the country has promulgated a series of policies and regulations to encourage and support large-scale castings. The growth rate of large-scale casting production has accelerated. With the improvement of the technology and equipment level of my country's foundry enterprises, the quality of my country's casting products has steadily improved. Especially in the industrial fields of automobiles, internal combustion engines, machine tools, power generation equipment, electric power, rail transit, etc., a group of large-scale and professional foundry enterprises with high quality level have been formed. The independent manufacturing capacity of key castings has been further improved, the dimensional accuracy, surface quality and internal quality of some castings have reached the int...
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IPC IPC(8): B22D19/00
CPCB22D19/00
Inventor 邱瑞军
Owner SHENGRUI TRANSMISSION