Improving the Durability of Machine Parts Using a Combined Method

Abstract

A combined processing method for improving the performance features of machine parts (durability), that works under intense wear and high lubricated or boundary friction has been developed; a working installation based on a CNC lathe has been developed. The research on resulting surface hardness material of steels: С45Е; 1.1191 (1 option); SA-240 TP 310S (2 option); 34CrNiMo6, 36CrNiMo4, 40NiCrMo4KD (3 option) and hardening depth variation under different combined processing conditions has been carried out. Surface roughness parameters have been calculated. The suggested method can increase the operational life of a machine part due to improving features, such as surface hardening, creating a favorable surface topography.

The Effect of Combined Processing on Residual Stresses in the Surface Layer of Power Plant Parts

“…However, a high hardness does not always have a beneficial effect on performance indicators (e.g., on wear resistance). The combined treatment has proven its effectiveness: the hardness increases, the roughness decreases, and a regular microrelief is formed [17,18]. However, residual stresses also have a significant effect on wear resistance.…”

“…The combined processing method consists of the sequential use of electromechanical processing (EMP) and diamond smoothing [17,18]. We developed a trial plant consisting of the Start bench lathe, a power source, a quench, a current supply system, and a quenching area cooling system, in which combined processing modes were tested [19,20] (Figure 1).…”

“…Technological heredity is manifested particularly vividly in combined processing methods, when technological factors sequentially and simultaneously affect the work part. Moreover, heredity not only has an effect immediately after the finishing operations of the technological process, but can also occur during the operation as a result of the effect of certain surface quality parameters created in the surface layer of the part during its previous processing [1,2,[9][10][11][12][13][14][15][16][17][18].…”

Controlling the Properties of the Surface Layers of Parts by Forming Regular Micro-Reliefs

“…This is due to the processes occurring in the surface layer: stress concentration, microcrack development, burning of alloying elements, softening, wear, redistribution of residual stresses, etc. It is possible to improve the reliability of machines by finishing-hardening treatment, which changes the properties of the surface layer over wide range [1][2][3][4][5][6][7][8]. The quality of the surface layer, i.e.…”

“…An important reserve of modern technology in increasing the carrying capacity of machine parts can be combined processes based on surface plastic deformation together with other methods: heat treatment, coating, etc. [5,7,12,[15][16][17].…”