Low-cost casting process for improving performance of engine cylinder body and cylinder cover casting

Abstract

The invention relates to the fields of pig iron processing, metal casting, iron or steel smelting and the like, in particular to a casting process for improving the performance of an engine cylinder body and cylinder cover casting. Comprising the following steps that when molten iron is conveyed to an iron tapping groove of the heat preservation pouring furnace from the interior of the heat preservation pouring furnace in a pressed mode, double-line wire feeding inoculation is started in the iron tapping groove, and the molten iron subjected to wire feeding inoculation is poured; in the pouring process, the temperature is controlled to be 1400-1420 DEG C, the pouring speed is 18-23 kg / s, and the adding amount of a wire feeding inoculation wire is 0.14-0.16% of the mass of poured molten iron; and after pouring is finished, a cylinder body and cylinder cover casting with improved performance can be obtained. The molten iron comprises the following components in percentage by mass: 3-3.5% of C, 1.7-2.3% of Si, 0.4-1.0% of Mn, less than or equal to 0.08% of P, 0.05-0.12% of S, 0.3-1.0% of Cu, 0.15-0.45% of Cr, less than or equal to 0.4% of Mo, less than or equal to 0.15% of Sn and the balance of trace elements and Fe; according to the double-wire feeding inoculation, a first wire feeding inoculation wire is arranged at the position 245-255 mm away from a water outlet of the tapping groove; and a second wire feeding inoculation line is arranged at a position 445-455mm away from the water outlet of the tapping groove.

Description

technical field [0001] The invention relates to the fields of pig iron processing, metal casting, iron or steel smelting, etc., and in particular relates to a casting process for improving the performance of engine cylinder head castings. Background technique [0002] The engine block and cylinder head are the core parts of the engine. The casting material is mainly alloy gray cast iron. Because the structure of the cylinder block and cylinder head castings is complex and the wall thickness varies greatly, the mechanical performance of the castings is generally evaluated by testing the performance of the castings at large positions. Performance, so casting performance becomes the key indicator of cylinder block and cylinder head. The grades of gray cast iron that are more suitable for casting cylinder heads are HT250 and HT275. After the grade HT300, the casting difficulty increases greatly. The performance of the casting itself reaches the standard of HT350, which is an ins...

AI Technical Summary

Problems solved by technology

(The effect is not obvious, and the cost is rising) In the Chinese invention patent CN2019104735550, a process for improving the fatigue strength of gray cast iron engine cylinder head at room temperature is disclosed. The process plan establishes a set of process technical parameters, including: ingredients, ingredients, inoculation, Five aspects of pouring temperature and boxing time

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