TAILIEUCHUNG - Volume 05 - Surface Engineering Part 3

Tham khảo tài liệu 'volume 05 - surface engineering part 3', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Re-ugliness average iin. 2DŨD 1000 900 250 125 Í3 33 IB 8 4 2 I Flanw culling 5naụpin j Sawing Plan ing shaping Drilrinrj Chemical milling Average applicator Eleclifcai dlacharpa machining Ltìss frequunl application Milling Bnadilng Rooming ElBctKMi-bwm mBcfilninp Ltaw-bMm machỉíũoạ Baetroeti Whies inachinins Bering t hrnlrij Barrel iinlatlingi E laclntnytlc g lndlng Roliar burnishing Grind to Honing ElectrafMlI shlng Pollsnln ỉ Lapping Superfiniarilng Sjnd catling Hot rolling pHfmanflnt mold casting Inmiment flailing Banidhifl Cold rollĩi drawing 1 Die cashing 50 25 CL3 312 D2fl Ũ02S ftoiifl hneoa aver ijfi pm Fig. 5 Ranges of average surface roughness produced by various processing methods. Source Handbook 24th ed. Industrial Press 1992 p 672 Machinery s Beyond their well-known importance for tribology Ref 15 16 and aesthetics surface finish and waviness can ha significant impact on the surface integrity of a part because wear behavior of surfaces is influenced by the su roughness. Huang Ref 17 has studied the fatigue life of turned and ground superalloys and has shown that the s roughness especially at high temperature and residual stresses of the samples had more effect on fatigue resistar surface hardening does. Stress relaxation can be a finishing operation per se. Reference 18 describes a variety of thermal and or mechai operations can be applied for stress relieving. For example 90 s in a salt bath at 345 650 R relieved 80 of residual stress of ground steel parts Ref 19 . Even if no stress relaxation technique is used fatigue-related rela sometimes occurs due to microplastic deformation. The rate of relaxation is greatest when the finishing process pro the steepest residual stress gradient normal to the surface Ref 20 . Thus sand-blasted or rolled parts could be expi relieve their residual stress much faster than milled ones for metallic components. Residual Stress Factors Sign of the Residual Stress. It has .

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