Core bar of volute casting sand core and manufacturing method of core bar

Abstract

The invention relates to the technical field of casting, and provides a core bar of a volute casting sand core used for a large compressor and a manufacturing method of the core bar. The core bar comprises an outer ring core bar and an inner ring core bar which are concentric; a plurality of radial beams arranged in the radial direction are connected to the inner ring core bar and the outer ring core bar, the outer ring core bar is located in a central region of a convolutional channel sand core of a volute, and the inner ring core bar is located on the inner side of the narrow seam part of the volute; and the core bar is characterized in that the outer ends of the radial beams extend out to the outer side of the outer ring core bar, the inner ends of the radial beams extend into the innerside of the inner ring core bar, the radial beams are each of a penetrating hollow structure, and the two ends of each radial beam are connected with a cooling tube used for in and out of cooling gas. According to a core bar structure of the core bar of the volute casting sand core, the radiant beams of the hollow structures are adopted, the cooling gas is introduced in the pouring process for forced cooling, and the problem that the sand core in the thin neck part is broken due to the fact that the temperature of the core bar in the thin neck part is excessively high, and the strength is reduced during pouring is prevented.

Description

technical field [0001] The invention relates to the field of casting technology, in particular to a core bone used for a sand core of a large-scale compressor volute casting and a manufacturing method thereof. Background technique [0002] The air compressor is a kind of equipment commonly used in the industrial field to produce compressed air, and the volute is the core component of the centrifugal compressor. The inner surface of the volute is an irregular surface structure, which is generally produced by casting. Its structure is as follows figure 1 and figure 2 As shown, the structural feature of the volute 1 is a convoluted channel 1A with a gradually changing section and a narrow slit 1B structure arranged on the wall of the channel 1A towards the inner side of the center of the vortex. Sand core structure for foundry such as image 3 As shown, the cylindrical annular channel sand core 2A used to form the channel 1A is connected to the central cylindrical core head...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem that the "big head and thin neck" structure of the sand core of the compressor pot shell casting in the prior art is easily deformed by buoyancy during the pouring process, the present invention provides a core bone of the sand core of the volute casting to overcome the problem during the pouring process. Deformation and fracture of thin neck

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