Casting mold and casting method for casting slender oil pipe castings

Abstract

A casting mold for fabricating slender oil pipe type castings comprises an upper sand mold, a lower sand mold, a sand core, an air-out structure, and a fixation structure. The air-out structure comprises a sand core interior air passage arranged in the sand core and a sand mold interior air passage arranged in the lower sand mold. The sand core interior air passage is arranged in a length direction of the sand core, and the sand mold interior air passage is arranged in a length direction of the lower sand mold. The fixation structure comprises a ventilating connecting rod. An upper end of the ventilating connecting rod passes through a via hole in the lower sand mold and a standard core hole of the sand core and into a sand filling area to be hermetically connected with the other end of the sand core interior air passage, and a lower end of the ventilating connecting rod is hermetically connected with one end of the sand mold interior air passage. In the invention, the fixation structure is arranged as a hollow air-out chamber, thereby achieving smooth air discharge from the oil pipe sand core under the premise of satisfying molding sand thicknesses of a side surface of an oil pipe and a lower core head of the lower sand mold, fundamentally solving the problems of fixation and air discharge of the slender sand core, and greatly lowering the casting difficulty of castings of such a structure.

Description

technical field [0001] The invention relates to the technical field of sand casting, in particular to a casting mold and a casting method for casting elongated oil pipe castings. Background technique [0002] During the sand casting process, the fixation and gas outlet of the sand core must be fully considered to ensure that the core does not move during the core assembly and pouring process, and the gas discharged from the core is completely discharged according to the designed channel, so as to ensure the production. The dimensions of the castings meet the relevant quality requirements, and at the same time, the castings are free from porosity defects. Especially for parts with airtightness requirements, stomata defects are fatal. [0003] However, for some sand cores with special structures, the outgassing and fixing of the sand cores often become the biggest difficulty in casting. Typical is the oil pipe structure in airframe products. Its main feature is that the oil ...

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Problems solved by technology

[0005] On the other hand, the air outlet of the sand core is achieved by placing nylon air passages. Since the length of the sand core is too long and the gas output is large, there will be a problem of poor air outlet from the sand core by setting the air outlet in the direction of the sand core length.

If the air is released through a 40mm hole, since the hole is too small, both the sand core fixing structure and the sand core air outlet structure must be installed in the casting hole, which is not only difficult to operate, even if the fixing structure and the air outlet structure are placed successfully The amount of sand filling at the site is limited, it is difficult to completely seal the position of the sand core and the core head, and it is easy to leak air

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