Identification and Analysis of Residual Stresses in the Axisymmetric Workpiece Existing before and after Machining

Abstract

Semi-manufactured parts dedicated for precise machining often have internal stresses which have remained after previous cutting and plastic processing. These stresses reside in a fixed state of balance over the entire volume of the workpiece. Removal of the machining allowance is associated with a change in the state of balance and deformation of the workpiece, which affect its dimensional and shape accuracy. The study, involving non-stress removal of precisely defined volume of the machining allowance and determination of the impact of this treatment on the deformation of the workpiece surface is presented. It is important from the point of view of dimensional tolerance of the axially symmetrical workpiece, finally processed by turning.

Fast Job Recognition and Sorting Based on Image Processing

“…The classic processing method for image point cloud cannot effectively recognize the jobs of complex shapes under micro environmental interferences [18][19][20][21][22][23]. For two-dimensional (2D) job images of different scales and poses, Gutt [24] constructed a 2D convolutional neural network (CNN) for the detection of weld jobs, and introduced a transform network capable of autonomous learning to adapt the CNN to the changing poses of the target job.…”

Stress Analysis of the Rotating Circular Saw Blade

“…Therefore, it is possible to neglect compounds of stress along the normal to the middle plane of the blade and to assume that the state of stress of the saw blade is only biaxial. When the saw blade rotates radial σ r and circumferential σ φ tension is generated [15]. Each element of the blade is in a state of biaxial stress.…”

Predictive Modelling of the Residual Stresses Distribution in the Aircraft Steel Part After Machining

“…Manufactured components products are expected to demonstrate superior quality and enhanced functional performance [1][2][3]. Material removal processes like turning, milling and grinding dominate among all manufacturing processes.…”

“…Material removal processes like turning, milling and grinding dominate among all manufacturing processes. Significant efforts were made by numerous investigators in the past few decades to investigate the nature of the surface alterations produced by the various material removal processes and to correlate them with the product's functional performance [1][2][3][4][5]. In machining of parts for the aircraft industry, residual stresses are ones of the most specified customer requirements.…”

“…metallurgical processes, cutting, plastic processing, heat processing etc. [3][4][5][6].These stresses results from the changes in energy. They lead to the formation of material fatigue damages.…”