Casting method capable of preventing defects of air cylinder casting pipe orifice

Abstract

The invention belongs to the field of casting and mainly relates to a casting method capable of preventing defects of an air cylinder casting pipe orifice. When the pipe orifice part is casted in theprior art, one loop of cold iron is adopted, and the casting defects such as shrinkage porosity and slag inclusion exist among the cold iron through RT ray detection; in consideration of the above problem, the invention provides a casting method capable of preventing casting defects for an air cylinder casting pipe orifice part. The casting method comprises: a casting process scheme of placing theair cylinder casting with the upward combined surface and the downward pipe orifice is selected, a crossed riser neck is arranged at the radial part of the air cylinder casting pipe orifice, a blindriser is arranged at the middle position of the crossed riser neck, and partitioned cold iron is arranged on the end face part of a crossed riser neck feeding superposed area of the air cylinder casting pipe orifice, so that the casting defects such as shrinkage porosity, slag inclusion and crack on the air cylinder casting pipe orifice part are effectively avoided, the quality of the air cylindercasting is improved, and the standard requirement for the RT ray detection first level of the air cylinder casting pipe orifice part is met.

Description

technical field [0001] The invention belongs to the field of casting, and mainly relates to a casting method for preventing nozzle defects of cylinder castings. Background technique [0002] The nuclear power cylinder casting is the shell part of the nuclear power unit, which needs to withstand high temperature and high pressure, and has strict performance requirements. The nozzle part of the cylinder casting needs to be welded butt fittings, etc., and the nozzle part needs to be inspected by RT rays, and casting shrinkage, slag inclusions, cracks and other defects are not allowed. The RT ray inspection of the nozzle part of the cylinder casting requires the first grade, the UT nondestructive testing of the pipe wall part requires the second grade, and the UT nondestructive testing of the nozzle joint surface requires the first grade, so the key part of the cylinder casting is the nozzle, and the nozzle part of the existing technology During casting, a ring of cold irons is...

AI Technical Summary

Problems solved by technology

The RT ray inspection of the nozzle part of the cylinder casting requires the first grade, the UT nondestructive testing of the pipe wall part requires the second grade, and the UT nondestructive testing of the nozzle joint surface requires the first grade, so the key part of the cylinder casting is the nozzle, and the nozzle part of the existing technology During casting, a circle of cold iron is used to detect casting defects such as shrinkage porosity and slag inclusion between the cold irons through RT rays. How to prevent casting defects at the nozzle part and ensure the quality of cylinder castings remains to be solved.

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