Rolling Strengthening Method for Engine Crankshaft Fillet

An engine and fillet technology, which is applied in the field of engine crankshafts, can solve problems such as crankshaft fatigue failure, and achieve the effects of increased strengthening, simple processing, and enhanced strength

Active Publication Date: 2016-06-01
CHERY AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These loads are alternating and may cause crankshaft fatigue failure

Method used

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  • Rolling Strengthening Method for Engine Crankshaft Fillet
  • Rolling Strengthening Method for Engine Crankshaft Fillet
  • Rolling Strengthening Method for Engine Crankshaft Fillet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0028] The specific implementation manner of the present invention will be described in further detail below by describing the best embodiment with reference to the accompanying drawings.

[0029] Such as figure 1 with figure 2 As shown, the crankshaft fillets where crankshaft fracture is likely to occur are the connecting rod journal fillet 2 at the connecting rod journal 1 and the main journal fillet 3 at the main journal 4 respectively.

[0030] The engine crankshaft fillet rolling strengthening method uses a rolling head 7 to perform rolling strengthening processing of the crankshaft fillet, and the rolling head 7 is connected to a power source, including the following steps;

[0031] (1) Build the engine crankshaft model on the computer; specifically: different engine specifications, different engine crankshafts; according to the specific engine crankshaft, use computer modeling software to input the length, width, height and height of each section of the engine cranksh...

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PUM

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Abstract

The invention discloses a fillet rolling enhancement method for engine crankshafts. A rolling head is used in enhanced rolling for crankshaft fillets. The method includes the steps of 1, establishing an engine crankshaft model in a computer; 2, simulating operating state of a crankshaft in the computer, and calculating to determine crankshaft fillet rolling force; 3, determining a rolling head rolling fillet, a rolling head included angle and the number of rolling turns; performing rolling enhancement on the engine crankshaft fillets; 4, subjecting a rolling-enhanced product to fatigue test; 5, according fatigue test results, selecting rolling force and the number of rolling turns, with enhancement degree meeting the set value, to roll the engine crankshaft fillets. The method has the advantages that rolling enhancement is performed on crankshaft fillets having concentrated stress and breaking easily, stress concentration can be relieved effectively, the stress concentrated part can be enhanced, and enhancement degree of the crankshaft fillets can be increased by 60%-100%.

Description

technical field [0001] The invention relates to an engine crankshaft, in particular to a method for strengthening the fillet of the engine crankshaft by rolling. Background technique [0002] The crankshaft bears bending load and torsional load during operation, and the internally unbalanced engine crankshaft also bears internal bending moment and shear force; the crankshaft without torsional vibration damping measures may also have a large torsional vibration elastic moment. These loads are alternating and may cause crankshaft fatigue failure. Practice shows that bending load plays a decisive role, and bending fatigue failure is the main failure mode. Therefore, the focus of the study on the structural strength of the crankshaft is the bending fatigue strength. [0003] The shape of the crankshaft is complex, and the phenomenon of stress concentration is quite serious, especially at the excessive fillet of the connecting rod journal and the crank arm, and the stress conce...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P9/02
CPCB23P9/02
Inventor 邓炯炯李玲娟
Owner CHERY AUTOMOBILE CO LTD
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