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A technology for engine cylinder blocks and casting alloys, which is applied in the field of engine cylinder heads, can solve the problems of aluminum alloys that are difficult to meet the requirements, low density and poor rigidity of aluminum alloys, and achieve the effects of improving casting technology, increasing strength and increasing hardness
Inactive Publication Date: 2016-02-10
宁静
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Problems solved by technology
Aluminum alloy has low density and light weight, but poor rigidity, low strength and high cost
However, for diesel engines of large trucks, the current aluminum alloys are difficult to meet the requirements
Method used
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Embodiment 1
[0014] Embodiment 1, a kind of engine block, the percentage content of each element composition in its casting alloy is as follows:
[0020] The required gas content in the final cast iron water: H≤3PPm, O≤50PPm, N≤80PPm, sulfide≤2, oxide≤2.
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Abstract
The invention relates to an engine assembly, in particular to an engine cylinder cover. The engine cylinder cover solves the preparation problem of a high-performance large engine cylinder cover. The engine cylinder cover is prepared from cast alloy comprising, by percentage content, 3.7-3.8% of carbon (C), 2.3-2.4% of silicon (Si), 0.5-0.55% of manganese (Mn), 1-3% of copper (Cu), 1-2% of stannum (Sn), 0.03-0.15% of cerium (Ce), 0.04-0.30% of yttrium (Y), 0.01-0.03% of erbium (Er), 0.15-0.25% of titanium (Ti), 0.25-0.50% of stibium (Sb), 0.15-0.25% of bismuth (Bi) and 0.12-0.20% of niobium (Nb). The dissolving rate of austenite is increased due to various rare earth elements in cast iron, so that ferrite nucleation is hindered, and the rare earth elements are strong pearlite promotion elements. The shape of graphite in the cast iron can be changed, the casting technology is improved, and normal-temperature mechanical performance and high-temperature mechanical performance of the cast iron are greatly improved.
Description
technical field [0001] The invention relates to an engine assembly, in particular to an engine cylinder head. Background technique [0002] The engine is the heart of the car, and the cylinder block is the skeleton and shell of the engine. During work, the cylinder body bears the comprehensive action of the stretching of the air pressure, the torsion and bending of the overturning moment under the joint action of the air pressure and inertial force, and the pre-tightening force of the bolts. Under the action of these forces and moments that change in size and direction, the machine body produces lateral and longitudinal deformations. When the deformation exceeds the allowable value, it will affect the reliability and workability of the parts connected to the machine base, especially the piston and connecting rod. The working reliability and wear resistance of other parts will be seriously affected, and the engine will not work normally. Therefore, the cylinder block materi...
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