Turbocharger shell and preparation method thereof

Abstract

The invention relates to a turbocharger shell and a preparation method thereof. According to a formula, the turbocharger shell is prepared from the following components in part by weight: 28 to 30 parts of pig iron, 3 to 8 parts of low-carbon steel, 32.53 to 45.2 parts of recirculated iron, 0.3 to 0.4 part of electrolytic manganese, 3.4 to 4.12 parts of No.75 ferrosilicon, 17.4 to 21.2 parts of electrolytic nickel, 1.4 to 1.95 parts of ferrochromium, 0.5 to 0.8 part of nickel magnesium nodulant and 0.8 to 1.0 part of inoculant. The preparation method comprises the following steps of: shot blasting, material preparation, smelting, nodulizing, pouring and mold-filling, shakeout and the like, wherein during mold-filling, pouring is performed after two external mold cores are closed, a set ofexternal mold core cavity is adopted for each product, the product is inoculated by a stream inoculation device, and the inoculant enters the cavity along molten iron. The product prepared according to the formula and the preparation method has the advantages of high dimensional accuracy, durability, stable size of castings and low deformation rate.

Description

technical field [0001] The invention relates to a turbocharger casing and a preparation method thereof, in particular to a high-nickel nodular cast iron turbine casing and a preparation method thereof. Background technique [0002] In recent years, China's auto market has grown rapidly, merging the achievements of scientific and technological progress. Under the pressure of energy crisis and environmental protection, the rapid development of contemporary automotive engine electronics technology and turbocharger technology interacts with the development of turbocharger manufacturing technology, which promotes the rapid development of the turbocharger industry. At the same time, with the improvement of turbocharger efficiency and the development of matching technology, turbocharger technology has been widely used in the automotive industry [0003] As a high-efficiency, energy-saving, and environmentally-friendly product with high technological content, the turbocharger can ...

AI Technical Summary

Problems solved by technology

The ratio of the three materials of the existing turbocharger housing 75# ferrosilicon, electrolytic nickel, and ferrochrome is unreasonable, and the characteristics of Si, Ni, and Cr are not fully utilized, and the properties of high temperature resistance, corrosion resistance, and thermal fatigue resistance are poor. defective

At the same time, the composition of nickel-magnesium nodulizer and inoculant is not good, the nodulization effect is poor, and the mechanical properties and thermal shock resistance are insufficient

The current production process of turbochargers has the problems of variable casting, low dimensional accuracy and low yield

Because the exhaust pipe and the supercharger are connected together, the structure is complicated, and it is not easy to form and cast. The supercharger is difficult to manufacture under the requirement of ensuring dimensional accuracy