Nitridized and undercut fillet rolling and reinforcing technology of normalized nodular cast iron crankshaft

A technology of nodular cast iron and rounded corners, which is applied in metal material coating process, solid diffusion coating, coating, etc., can solve problems such as not being able to meet service conditions, avoid bearing bush edge load phenomenon, improve fatigue bending moment, reduce The effect of manufacturing costs

Inactive Publication Date: 2012-07-04
BINZHOU HEAD CRANKSHAFT
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  • 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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  • Nitridized and undercut fillet rolling and reinforcing technology of normalized nodular cast iron crankshaft
  • Nitridized and undercut fillet rolling and reinforcing technology of normalized nodular cast iron crankshaft
  • Nitridized and undercut fillet rolling and reinforcing technology of normalized nodular cast iron crankshaft

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Embodiment 1

[0019] To be strengthened is the model Y4105 ductile iron crankshaft, the material is QT800-3.

[0020] A process for nitriding and undercutting rounded corner rolling strengthening of normalized nodular cast iron crankshafts. The process is to perform rounded undercutting on the crankshaft main journal and connecting rod neck, and cut undercutting grooves at the rounded corners , and then nitriding, through the control of the nitriding furnace atmosphere, the crankshaft journal and fillet surface form a nitriding layer, in which the white and bright compound layer is 0.002-0.007mm below the outer surface, and the diffusion layer is 0.08-0.12mm below the outer surface. Surface hardness HV 0.1 600, and then use the rolling wheel to directly roll the rounded corner after sinking. When rolling, the rolling angle α is 40°, the rolling force P is 11000N, and the rolling radius R is 1.9mm. The pressing depth h is 0.4mm, and the radius R' of the undercut groove is 2.2.

[0021] The...

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Abstract

The invention provides a nitridized and undercut fillet rolling and reinforcing technology of a normalized nodular cast iron crankshaft, belonging to the processing technology of a crankshaft. The technology comprises the following steps: undercutting and nitridizing the fillet of a crankshaft journal and a connecting rod journal, controlling an atmosphere of a nitriding furnace so as to respectively form nitriding layers on the surfaces of the crankshaft journal and the fillet; and then utilizing a rolling wheel to roll the undercut fillet. The reinforcing technology can effectively improve the fatigue bending moment of the crankshaft and the wear resistance of the crankshaft journal, can improve the fatigue bending moment by more than 110.7 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 iron crankshaft 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 existence of an undercutting groove eliminates rolling protrusions and avoids the bearing edge load phenomenon caused by the 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 丁杰王守河张东张春雨杨贵波
Owner BINZHOU HEAD CRANKSHAFT
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