Method for laser manufacture of low speed heavy-duty ship diesel engine piston ring groove

Abstract

The invention relates to a method for laser manufacture of a low speed heavy-duty ship diesel engine piston ring groove. The method comprises: preparing required powder materials according to the components of alloy powder; before carrying out laser cladding work, cleaning a piston ring groove to ensure the absence of oil stains, impurities and the like; selecting a DL-HL-T5000 type CO2 gas lasers, using a synchronous powder conveying method, directly conveying alloy powder into a melting pool by using a gas carrying powder conveying device, and carrying out laser cladding on the end surface of the piston ring groove, wherein the thickness of the powder is 1.5-2 mm; and when the laser cladding is performed on the end surface of the piston ring groove, making a laser beam be obliquely incident into the piston ring groove, and coaxially blowing argon during the cladding process so as to protect, wherein the angle between the laser beam and the bottom surface of the ring groove is 35-38 DEG C. According to the present invention, the process parameters of the laser cladding and the ration of various elements in the powder material are optimized and designed, such that the cladding layer of the low speed heavy-duty ship diesel engine piston ring groove has characteristics of compact and uniform structure, and no defects such as gas holes, impurities, cracks, and the like.

Description

technical field [0001] The invention relates to a laser manufacturing method for ship power components, in particular to a laser manufacturing method for a low-speed heavy-duty marine diesel engine piston ring groove. Background technique [0002] The diesel engine is the main source of ship power, and the piston is one of the main moving parts of the diesel engine, which is an integral part of the combustion chamber, and it bears a huge task. When the piston is working, it is subjected to great mechanical stress and thermal stress, and at the same time it is also subject to wear. The wear of the upper and lower end faces of the piston ring is mainly due to the mechanical grinding of the upper and lower end faces by the hard residue in the oil and fuel and the dust particles mixed in from the atmosphere, which is essentially abrasive wear. Especially for low-speed heavy-duty diesel engines burning heavy oil, the viscosity of heavy oil is very high, which seriously affects f...

AI Technical Summary

Problems solved by technology

As an advanced technology in material surface strengthening in recent years, laser cladding has a series of advantages such as small deformation of the workpiece, low dilution rate, and strong bonding between the coating and the substrate, while the common laser cladding process in the prior art It cannot be taken for granted that it is suitable for low-speed heavy-duty marine diesel engine piston ring grooves. It is still necessary for those skilled in the art to reasonably select specially prepared cladding powders and specific cladding processes according to different substrates and required properties, otherwise the cladding Defects such as pores and cracks will appear in the coating, which will affect the performance of the workpiece