Process for casting gearbox body of centrifugal compressor

Abstract

A process for casting a gearbox body of a centrifugal compressor comprises the following steps: 1), preparing a mould box, wherein a gearbox adopts two resin sand box molds, a plurality of U-shaped ceramic pipes are arranged on the parting surface of the lower box, two ends of each U-shaped ceramic pipe are connected with a filter and a horizontal runner, a U-shaped ceramic pipe is arranged at the bottom of the lower box, and two ends of the U-shaped ceramic pipe at the bottom of the lower box are connected to the horizontal runner and a flange at the bottom of the lower box, so as to form an upper stepped inner runner, a middle stepped inner runner and a lower stepped inner runner for feeding iron liquid; 2), carrying out brushing or flow coating, that is, conducting brushing or flow coating on a cavity and a mud core; 3), carrying out mold assembling, wherein residual sand in the cavity and the mud core is cleaned up, the mud core is lowered into the cavity smoothly, a filter disc is placed into a filter, a box sealing strip and glue are placed, positioning pins are placed into positioning holes, and mold assembling is carried out smoothly; and 4), pouring: a casting head is well placed, an air exhaust core is well surrounded by sand, the pouring temperature is controlled to be 1400 to 1350 DEG C, and the pouring time is controlled to be 80 to 90 minutes. According to the invention, the problem that casts produced according to the original process have scrapped gas pores is effectively solved; the production cost is reduced; and the productivity effect is improved.

Description

technical field [0001] The invention relates to the field of casting, in particular to a casting process for a gear case of a centrifugal compressor. Background technique [0002] The gear box is an important safety part of the centrifugal compressor. The working environment is very harsh. The casting must be tested for water pressure leakage prevention. The appearance of the casting is not allowed to have any casting defects. [0003] In the existing gear box casting process, the molten iron is introduced from the middle and top of the casting, the ingates are located on both sides of the casting, the pouring temperature is controlled at 1350-1300°C, and the pouring time is 60 seconds; A total of 12 exhaust rods and One of the bright risers. There are pores in the poured product, and the positions of the pores are distributed at the root of the riser or the flange and boss on the upper surface, resulting in the scrapping of the product. Contents of the invention [0...

AI Technical Summary

Problems solved by technology

The poured product has air holes, and the air holes are located at the root of the riser or the flange and boss on the upper surface, resulting in the product being scrapped

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