Engine crankshaft fatigue crack laser repairing and strengthening device and method

A fatigue crack and laser repair technology, applied in the coating, metal material coating process, etc., can solve the problems that the surface roughness of the crankshaft is greatly affected, only 0.1~0.8mm, and cannot be automated, so as to improve the fatigue strength and Long service life, improved wear resistance, simple and quick repair

Inactive Publication Date: 2016-07-27
JIANGSU UNIV
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Problems solved by technology

However, due to the limitation of the crankshaft processing technology, the fillet rolling of each journal is difficult to match with the rolling, which often results in the phenomenon of gnawing and cutting of the fillet. Moreover, the crankshaft is deformed after rolling, and the effect is not good.
Shot peening can effectively avoid the above situation, but the shot peening process has a great influence on the surface roughness of the crankshaft, and the residual stress formed by shot peening is

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  • Engine crankshaft fatigue crack laser repairing and strengthening device and method

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Embodiment 1

[0023] Damage site: the V journal of the crankshaft

[0024] Laser process parameters: cladding power P=5000W; spot diameter 5mm; scanning speed V=200mm / min; lap rate 50%.

[0025] Cladding powder: nickel-based ceramic alloy powder, its composition is 10% tungsten carbide, 0.3% carbon, 5% calcium fluoride, 4% boron, 3% silicon nitride, 0.6~1.0% alum, 11~14% molybdenum, 1.0~1.4% silicon, 15~18% chromium, the balance is nickel.

[0026]Detailed steps: Carry out magnetic particle flaw detection on the crankshaft of the engine to be clad, determine the position, size and shape of the crack in the V journal of the crankshaft, and use alcohol or acetone to remove the oil stains and dirt on the surface of the crankshaft; put the treated crankshaft on the five-axis linkage work On the table, after positioning it, fix and clamp it with a fixture, and control the position and angle of the crankshaft on the five-axis linkage workbench through the hydraulic telescopic rod; the central co...

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Abstract

The invention discloses an engine crankshaft fatigue crack laser repairing and strengthening device and method. The device comprises a computer control processing system, a coaxial atomizing powder feeding unit, a laser cladding unit and an auxiliary working system. Repairing and strengthening effects of laser cladding to fatigue cracks are fully utilized, namely, the fatigue cracks of an engine crankshaft are subjected to laser cladding, high-quality surface cladding coatings are obtained at filleted corners of the crankshaft, high-amplitude residual compressive stress is generated, fatigue resistance of the crankshaft is improved effectively, mechanical property of the crankshaft is improved comprehensively, fatigue lives of the crankshaft are greatly prolonged, and the purposes of prolonging the life and improving the reliability of the crankshaft are achieved.

Description

technical field [0001] The invention relates to a device and a method for strengthening the surface of a workpiece by using a laser, in particular to a device and a method for repairing and strengthening fatigue cracks of an engine crankshaft by laser. Background technique [0002] The vigorous development of the automobile industry has put forward higher requirements and expectations for the automobile manufacturing industry. The new generation of national IV / V emission standard vehicles requires better safety and higher operational reliability. As the core component of the whole car, the engine has a decisive influence on the overall performance of the car. When the engine is working, the maximum temperature in the cylinder can reach more than 2500K, and the maximum pressure can reach 5~9MPa. Now the maximum speed of the automobile engine can reach 4000~6000r / min. The crankshaft is the most concentrated and most complicated stress of the automobile engine. part. The fail...

Claims

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Application Information

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IPC IPC(8): C23C24/10C22C19/05C22C32/00
CPCC22C19/056C22C32/0047C23C24/103
Inventor 任旭东徐士东李琳吴教义孙建荣佟艳群周睿胡征征
Owner JIANGSU UNIV
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