Piston top material of combined piston for big cylinder-diameter diesel engine
A technology for combining pistons and diesel engines, which is applied in the field of piston manufacturing materials, can solve the problems of the unfavorable influence of piston size consistency, the inconvenient clearance of diesel engine pistons and cylinders, deformation, etc., and achieves the effects of stable size, favorable for popularization and application, and simple process.
Active Publication Date: 2012-05-30
CRRC CHANGZHOU DIESEL ENGINE COMPONENTS CO LTD +1
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AI Technical Summary
Problems solved by technology
Due to the subsequent strengthening treatment, the piston head must be heated locally or as a whole, and the size of the piston head will inevitably be deformed, which will have an adverse effect on the consistency of the piston size, especially for the adjustment of the piston cylinder clearance of the diesel engine, which will bring a lot of inconvenience
Method used
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specific Embodiment 1
[0012] A piston head material for a combined piston of a large-bore diesel engine; Mo: 0.40, Cu: 0.05, V: 0.200, and the balance is Fe.
specific Embodiment 2
[0013] A piston head material for a combined piston of a large-bore diesel engine; Mo: 0.40, Cu: 0.05, V: 0.200, and the balance is Fe.
[0014] The piston head made of the material of the present invention does not need to be strengthened, but only needs a basic water-based quenching process, fully utilizes the comprehensive mechanical properties of the material, improves the wear resistance of the piston head material, and improves the service life of the piston head. The performance is as follows:
[0015]
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The invention relates to a piston top material of a combined piston for a big cylinder-diameter diesel engine, comprising the following ingredients by mass percent: 0.28-0.39 of C, 0.55-0.75 of Si, 0.45-0.65 of Mn, 0-0.025 of P, 0-0.025 of S, 1.00-1.50 of Cr, 0-0.25 of Ni, 0.40-0.60 of Mo, 0-0.35 of Cu, 0.20-0.35 of V, and the balance Fe. Compared with a common piston top material, hardness of the piston top material in the invention is improved by one class while other plasticity indexes still meet a stable standard; in addition, comprehensive mechanical properties and metallographic phase structure are good for function demand of the piston. In the invention, a water-based quenching technology is adopted, the comprehensive mechanical properties of the material are fully utilized, and the abrasion resistance of the piston top material is improved to prolong the service life of the piston top. The piston top made from the material in the invention can be obtained by basic water-base quenching technology rather than enhanced processing. The invention has the advantages of simple technology, stable size and easy popularization and application.
Description
technical field [0001] The invention relates to a piston manufacturing material, in particular to a piston head material for a combined piston of a large-bore diesel engine. Background technique [0002] An important indicator for judging the carrying capacity of a large piston is the specific power PA (w / mm2) of the piston. For the special requirements of fuel, load range, environmental conditions and service life, diesel engines will use completely different pistons. For example, my country's DF4 series locomotive diesel engines have used all-aluminum pistons, integral nodular iron pistons, and combined pistons. Among them, the combined pistons have steel top iron skirt combined pistons and steel top aluminum skirt combined pistons. The piston skirt is die-formed Si-Al alloy, which should have sufficient rigidity and high temperature strength, minimum weight, good wear resistance, thermal conductivity, and volume stability; the piston head is forged alloy steel, which sho...
Claims
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IPC IPC(8): C22C38/46
Inventor 谭勇敢彭春华
Owner CRRC CHANGZHOU DIESEL ENGINE COMPONENTS CO LTD