Bi-metal bent pipe manufacturing process based on evaporative pattern casting and vibration pouring

Abstract

The invention discloses a bi-metal bent pipe manufacturing process, which includes: assembling a foam pattern (1) of a bi-metal bent pipe lining and an outer steel pipe (2) that has through-holes (3) drilled on an outside wall, and plugging the through-holes (3) with foam bodies (4) so as to form a combined foam pattern; bonding the combined foam pattern with a pouring system (5) for foam molding of an evaporative pattern and a vent hole (6) to form an overall pattern, and placing the overall pattern in a sand box to conduct sand filling and molding; burning off the foam pattern in the overall pattern, then putting the sand box on a vibration pouring jolting platform to perform vibration pouring, carrying out heat preservation for some time, and then opening the box to clear up the casting, thus finishing manufacturing the bi-metal bent pipe. The process provided in the invention adopts non-vacuum vibration casting. The lining of the manufactured bi-metal composite bent pipe has a more compact and wear resistant texture, and the mechanical and metallurgical bonding degree outside the composite bent pipe is high, so that the outside toughness and wear resistance of the bi-metal bent pipe are effectively improved, the service life is prolonged, and the production cost of the bi-metal bent pipe is effectively reduced.

Description

technical field [0001] The invention belongs to the technical field of manufacturing wear-resistant composite pipe fittings, in particular to a manufacturing process for bimetallic bent pipes. Background technique [0002] In recent years, with the vigorous development of the construction industry, the high-pressure concrete delivery pump truck has been continuously updated, and the height and distance of its boom pumping concrete are also increasing. The performance and service life of the elbow part put forward higher requirements. Due to the high centrifugal force generated by the high-speed conveying material passing through the boom conveying elbow, the impact, wear and corrosion of the high-speed material on the outside of the conveying elbow are intensified, making it the weakest link in the conveying pipeline. The existing single material is difficult to achieve the perfect combination of wear resistance and toughness, and cannot effectively improve the service life...

AI Technical Summary

Problems solved by technology

On the one hand, due to the slow cooling rate of this process, it is easy to cause problems such as coarse grains of the wear-resistant body and non-dense structure. The improvement of the toughness of the metal composite elbow, especially the gap on the outside of the bimetallic elbow, cannot make the bimetal form a mechanical metallurgical bond, which seriously reduces the toughness of the bimetallic composite elbow. At the same time, it is easy to replace the elbow in time during use Separation and detachment of the inner lining of the bimetallic elbow pipe and the outer steel pipe occurred, resulting in the overall blockage of the pipeline, resulting in engineering accidents

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