ABSTRACT
During Engine use, some parts of the original geometric shape and dimensions will change due to wear, deformation, breakage, fracture,corrosion, and other damage.thereby undermining the characteristics and working ability of co-ordination between the parts, so that the parts,assemblies and even the normal working of the machine is affected.
This paper carried out the size of the key parts of the engine remanufacturing recovery technology research. First, do some basic work,these are developed automated spraying platform which provides the foundation for the experiments carried out and process research; study the performance of the spraying supplies and its spray coatings, and provide the basis for the spraying selection. Based on the above work, respectively,using the cold spray, thermal spray, swelling repair recovery techniques to study the process of the crankshaft, engine block waterways, piston pins and cylinder head conduit hole and critical process. Specific content and conclusions are as follows:
1.In order to overcome the high cost of the spraying machine hand, on the basis of the normal decommissioning lathe, to develop automated spraying platform. The spray platform meets the plane, shaft, bore engine parts spraying requirements. At the same time, according to the characteristics of the plane, shaft, bore parts of the engine, planning the path of spraying walk. In order to figure out which coatings to select according to the required repair parts,coating performance sprayed by five kinds of consumables of cold spray and two kinds of thermal consumables spray has been compared. Physical characteristics of each consumable and coating adhesion strength, hardness, wear resistance and tribological properties of law are obtained.
2.High velocity arc spraying process to restore the crankshaft journal size has been studied.Its main processes include:pretreatment before spraying,the crankshaft spraying, processing after crankshaft spraying.For roughening process before spraying the surface preparation of sandblasting,the main factors of roughening pretreatment process parameters on the surface roughness has been analyzed.And gives these impact factor important order, the relationship between the the sandblasting parameters and the substrate surface roughness obtained by linear regression formula.It has guiding significance for selection of the sand, the formulation process parameters as well as surface roughness acquisition method.In order to clarify how pretreatment Surface roughness affects coating adhesion strength,depth analysis of the roughness values of the interval of the three roughness on the bonding strength are carried out.The conclusion is that the roughness values of the three roughness interval satisfys coating adhesion strength requirements.
3.Cold spray process to restore the size of the engine block waterways has been studied. The process comprises surface roughening, spray coating,processing after spraying.After the recovery of the waterways through the cold spraying,coating performance has been characterized, proved the coating performance meets the requirements.
4.The size recovery process of Piston pin and cylinder head the conduit hole are researched by the elastoplastic deformation and expanded joint methods.For the piston pin which working surface is the outer cylindrical surface and cylinder head conduit hole which working surface is the internal cylindrical surface, the elastoplastic deformation method and expansion copper conduits were used and studied. Derivation from the perspective of elastoplastic mechanical principle of the process is given,and the process validated, process specifications formed. And applied for an invention patent and a utility model patent.
KEY WORDS: Remanufacturing, high velocity arc spraying, HVOF spraying, cold spray, swollen repair
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