Fillet rolling and reinforcing technology of normalized nodular cast iron crankshaft

A technology of nodular cast iron and rounded corners, which is applied in the direction of metal material coating process, solid diffusion coating, coating, etc., and can solve problems such as not being able to meet service conditions

Inactive Publication Date: 2012-07-04
BINZHOU HEAD CRANKSHAFT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For supercharged and intercooled engines with an explosion pressure of 12-14MPa or even higher, the fatigue bending moment of the engine crankshaft and the wear resistance of the crankshaft journal produced by the existing processing technology can no longer meet the requirements of service conditions

Method used

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  • Fillet rolling and reinforcing technology of normalized nodular cast iron crankshaft
  • Fillet rolling and reinforcing technology of normalized nodular cast iron crankshaft
  • Fillet rolling and reinforcing technology of normalized nodular cast iron crankshaft

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Embodiment 1

[0020] To be strengthened is the model Y4105 ductile iron crankshaft, the material is QT800-3.

[0021] A process for nitriding and fillet rolling strengthening of normalized nodular cast iron crankshafts. The process is to carry out nitriding first, and to form nitriding on the surface of crankshaft journal and fillet by controlling the atmosphere of the nitriding furnace. layer, wherein the white and bright compound layer is 0.002-0.007mm below the outer surface, the diffusion layer is 0.08-0.12mm below the outer surface, and the surface hardness is HV 0.1 556, and then use the rolling wheel to roll the fillet directly. When rolling, the rolling angle α is 40°, the rolling force P is 9800N, the rolling radius R is 2.0mm, and the rolling depth h is 0.15mm. Control rolling bump: τ b ≤0.003mm.

[0022] After rolling, the strengthening effect is: fatigue bending moment M after normalizing nitriding and fillet rolling -1 =2285N.m, and the fatigue bending moment M of normalizin...

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Abstract

The invention provides a nitridized fillet rolling and reinforcing technology of a normalized nodular cast iron crankshaft. The technology comprises the following steps: firstly, nitriding is performed, nitriding layers are formed on the surfaces of a crankshaft journal and a fillet by contolling an atmosphere of a nitriding furnace and a rolling wheel is utilized to roll the fillet; during rolling, the rolling angle alpha is from 30 degrees to 45 degrees, the rolling pressure P is from 8000N to 15000N, the rolling radius R is from 1.5mm to 2.5mm, and the rolling depth h is from 0.1mm to 0.2mm. The reinforcing technology can effectively improve the fatigue bending moment of a crankshaft and the wear resistance of the crankshaft journal, can improve the fatigue bending moment by more than 99.4 percent and the surface hardness HV0.1 to be between 500 and 620 and satisfies the use requirements of a supercharged mid-cooling engine with high explosion pressure so that the nodular cast ironcrankshaft can also be used in the supercharged mid-cooling engine with the explosion pressure of 12MPa to 14MPa or even higher, and the manufacture cost of the crankshaft is greatly decreased. The invention optimizes and combines various nitridized fillet rolling parameters and avoids the bearing edge load phenomenon caused by rolling protrusions.

Description

technical field [0001] The invention relates to a processing technology for an engine crankshaft, in particular to a strengthening technology for an automobile engine crankshaft. Background technique [0002] Due to its high strength, high plasticity, high wear resistance, high shock absorption, excellent processing performance and low production cost, ductile iron has been widely used in the manufacture of automobile engine crankshafts. Especially in the crankshaft of naturally aspirated automobile engine whose explosion pressure is 7-9MPa, it has an absolute advantage. However, in recent years, with the improvement of emission requirements for automobile engines, supercharging technology has been more and more used in automobile engines. For supercharged and intercooled engines with an explosion pressure of 12-14MPa or even higher, the fatigue bending moment of the engine crankshaft and the wear resistance of the crankshaft journal produced by the existing processing tech...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23F17/00C23C8/26C21D7/04
Inventor 丁杰张之奎张立平王守河张国江
Owner BINZHOU HEAD CRANKSHAFT
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