Abstract
This paper presents the methods of experimental determining the depth of the plastically deformed top layer in the roller burnishing process. Precise determination of the depth of the plastically deformed layer is difficult due to slight deformation at the boundary of the plastic and elastic zone, the lack of visible changes in the microstructure, and minimal changes in microhardness. The article shows the method of original measurement method that consists in determining the thickness of the deformed layer using rings. The method involves the profilographometric measurements of the disconnected rings (samples) which are flat-faced in the package on the mandrel. The rings material deforms plastically in the surface layer causing wrapping of the end face of the ring in the direction of the rolling tool movement. After dismantling the ring pack, measurements were made on the face of each ring along radial directions, and the thickness of the deformed layer was observed on the microscope. The method was verified by microhardness measurements in the cross-section and cross-section of the ring. The results of deformation depth measurements were verified by finite-element-based numerical simulation.
Highlights
The roller burnishing (RB) process is used when the goal is to achieve a high-quality surface finish strengthened by the strain hardening phenomenon [1-2]
This paper presents the method for determining the depth of plastic deformation of the surface layer in the process of roller burnishing
The plastic deformation in the surface layer does not change the texture of the ground surface
Summary
The roller burnishing (RB) process is used when the goal is to achieve a high-quality surface finish strengthened by the strain hardening phenomenon [1-2]. Many material forming technologies such as burnishing, thread rolling, spline rolling, knurling, drawing lead to both the deformation of the surface layer of the material and changes of its properties This phenomenon of cold plastic deformation introduces the compressive stresses into the surface layer increasing its surface hardness, and both static and fatigue strength [1, 2]. Balland et al [17] propose finite element 3D modelling of the ball burnishing process and analysed the effect of the burnishing parameters on the properties of the surface material. Almost all researchers in the works cited above, the depth of plastic deformation of the surface layer identify with the area with increased hardness of the material as a result of plastic deformation This is an imprecise opinion because a noticeable increase in hardness of the material is possible only under the influence of significant plastic deformations [9]. Determined depths of the plasticised surface layer were verified based on the results of finite element (FE) modeling
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