Casting method of thin-walled pipe casting with spatially asymmetric structure

Abstract

The invention provides a casting method of a thin-walled pipe casting with a spatially asymmetric structure. The method comprises the following steps: manufacturing a cavity sand core internally provided with a core bar and pores by utilizing animi resin sand; brushing a alcohol-based graphite coating on the surface of the sand core; after a white die is attached to the sand core, plugging a gap at the upper end of the joint of the core head and the white die by use of plaster; after the combination of the white die and the sand core is wholly soaked and coated in a water-borne quartz powder coating and then dried, removing coating layers at the head of the sand core and an exhaust port, and modeling and casting the combination. The method can be used for effectively solving the problems of deformation, uneven wall thickness, water and gas leakage and the like of a thin-walled pipe casting with a spatially asymmetric structure, and the obtained casting has the advantages of accurate size, uniform wall thickness, compact material texture, beautiful appearance and low cost. The method has the advantages of simple process, easiness for operation, low rejection rate, low labor intensity and high reliability.

Description

technical field [0001] The invention belongs to a casting process, in particular to a casting method of a thin-walled tubular casting with a spatial asymmetric structure. Background technique [0002] Exhaust pipe is a kind of pipe casting with complex inner cavity and high dimensional accuracy requirements on diesel engine. The wall thickness is 5-6mm, and the weight is usually 50-100 kg. The common materials are QT450-10, HT250, RUT380, etc. Its structure generally shows a spatial curve trend, which is characterized by non-geometric symmetry. It can withstand air pressure and water pressure during work, and there must be no defects that affect the density. The exhaust pipe is also an exposed part of the diesel engine and must have a good appearance. [0003] Commonly used casting methods for exhaust pipe parts include: green sand casting, self-hardening resin sand casting, iron mold sand-covered casting, lost foam casting, etc. These casting methods have their ...

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is to provide an economical and reliable casting method for thin-walled pipe castings with asymmetrical space structure, so as to solve the common wall thickness unevenness, deformation and air leakage of thin-walled pipe castings with asymmetrical space structure Water leakage and other problems, to obtain high-quality castings

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