Casting method for exhaust branch pipe of thin-wall ball iron triplet

Abstract

The invention relates to a casting method for casting the three-way ventilate branch tube of thin-wall iron element, which comprises: (1), using the curvature formed by the central line of C exhaust open and the central line of A exhaust tube, to make the C and A exhaust opens above the parting surface, to be shaped via upper and lower outer moulds; the tube core and sand core are put via the serial number, and it uses pour system that combines side pour and bottom pour with contract cap and cold iron; (2), preparing outer mould, core box, section sheet, pour cap, and the wood mould that checking sample plate; (3), preparing the casting element and sand core; (4), drying the casting element and the sand core, and closing the tank after arranging the sand core; (5), smelting and pouring; (6), cooling and molding; (7), cleaning the casting element; (8), thermally treating; (9), testing the water pressure. The invention can improve the quality of casting element, and improve the producing efficiency.

Description

technical field [0001] The invention relates to a casting method of a complex-shaped casting, in particular to a casting method of a thin-wall ductile iron three-way exhaust branch pipe. Background technique [0002] The exhaust branch pipe is a thin-walled ductile iron tee tubular casting with complex shape. One of the exhaust ports has bending angles in three directions, which requires high dimensional accuracy in the mold, molding and box matching process; the pipe diameter of the exhaust branch pipe: Φ120- 200mm, pipe wall thickness: 6-8mm, pipe length about 800mm. According to the technical specifications of the medium-speed diesel engine patent company, the material of the casting is: FGS350-22, the performance requirements of the test rod before the furnace, and the tensile strength: 330-390N / mm 2 , yield strength: 220-240N / mm 2 , Elongation: 12-18%, Brinell hardness: 130-180. Castings have higher alloy composition requirements, Si: 3%, Cr: 0.3%, Mo: 0.25%. Castin...

AI Technical Summary

Problems solved by technology

[0011] The purpose of the present invention is to overcome the deficiencies of the prior art, provide a casting method for thin-walled ductile iron tee exhaust branch pipes with complex shapes, improve the dimensional accuracy of castings, and reduce casting defects such as trachoma, air holes, and cold shuts in castings. Hydraulic test without leakage, easy to operate, reduce labor intensity and improve production efficiency

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