The Formation and Behaviour of Residual Stresses with Finished Surfaces

2016 ◽  
Vol 686 ◽  
pp. 63-67
Author(s):  
Frantisek Holešovsky ◽  
Radek Lattner ◽  
Martin Novák ◽  
Milan Dian
Keyword(s):  
Residual Stress ◽  
High Pressures ◽  
Load Capacity ◽  
Ground Surface ◽  
Plastic Deformations ◽  
Workpiece Surface ◽  
Dimension Stability ◽  
Machine Parts ◽  
Stress Influences

The single tool grains affect the workpiece surface during grinding in the separated areas of deformation. The elastic and consequently plastic deformations occur at the engagement of grains. The friction of grain and material likewise the friction of elementary chip and grain acts simultaneously. These phenomena are accompanied with an origination of great amount of heat and high pressures and that is the reason for residual stress origin and formation in the ground surface. The residual stress is an important factor in influencing usable properties of machine parts. The stress influences not only the dynamical load capacity of surface but the durability and quality of design units as well. This stress is considered as the source of so called technological notches, having an influence on corrosion resistance, wear resistance, and dimension stability of machine parts.

Investigation on the Workpiece Surface Residual Stress in High Efficiency Deep Grinding with Ultra High Wheel Speeds

2011 ◽  
Vol 487 ◽  
pp. 24-28
Author(s):  
Tan Jin ◽  
D.J. Stephenson ◽  
X.M. Sheng
Keyword(s):  
Residual Stress ◽  
Plastic Deformation ◽  
Contact Time ◽  
High Efficiency ◽  
Ground Surface ◽  
Grinding Process ◽  
Combined Effects ◽  
Surface Residual Stress ◽  
Workpiece Surface ◽  
Short Contact Time

The residual stress on the ground surface of workpiece in high efficiency deep grinding (HEDG) has been investigated. It has been found that the mechanism in forming the ground surface residual stress in HEDG is much different to that in the conventional shallow cut grinding process. It is not a thermally dominant event as in most of the shallow cut grinding mode; it is instead driven by the combined effects of both the thermal and mechanical loadings. The compressive plastic deformation near the workpiece surface during grinding and the short contact time in the HEDG regime, makes it possible to generate compressive surface stresses even when the surface temperatures are above 700-800°C.

scholarly journals Residual Stresses Distributions in Grinding of 3J33 Maraging Steel with Miniature Electroplated CBN Wheel

2019 ◽  
Vol 256 ◽  
pp. 01002 ◽  
Author(s):  
Shouguo Shen ◽  
Beizhi Li ◽  
Weicheng Guo
Keyword(s):  
Residual Stress ◽  
Residual Stresses ◽  
Maraging Steel ◽  
Ground Surface ◽  
Stress Profile ◽  
Residual Stress Profile ◽  
Compressive Stresses ◽  
Grinding Speed ◽  
Grinding Conditions

It is well known that the residual stresses on the ground surface and the subsurface can influence the service quality of a component, such as fatigue life, tribological properties, and distortion. In this paper, an experimental investigation was conducted to determine the effects of grinding force, temperature and grinding conditions, such as grinding speed, workpiece speed and grinding depth, on the surface and in-depth residual stresses distributions induced by grinding of 3J33 maraging steel with the miniature electroplated CBN Wheels. The results show that a ‘hook’ shaped residual stress profile is generated with the maximum compressive stresses occur at the depth of 3-14 ?m below the ground surface. There is a good correlation between residual stress and cutting force, but the trend related to grinding temperature is not obvious. The main grinding parameters affecting the residual stresses distributions is grinding speed, while the workpiece speed and grinding depth have the least effect.

Research on Cutting Residual Stresses Based on Thermo-Mechanical Coupling

2009 ◽  
Vol 628-629 ◽  
pp. 651-656
Author(s):  
Ying Qiang Xu ◽  
S.J. Li ◽  
T. Zhang ◽  
X.H. Yang
Keyword(s):  
Residual Stress ◽  
Finite Element ◽  
Residual Stresses ◽  
Cutting Speed ◽  
Element Model ◽  
Stress Generation ◽  
Workpiece Surface ◽  
Mechanical Coupling ◽  
Basic Parameters

Mathematical models of basic parameters, force and thermal parameters of cutting were obtained by applying the thermo-elastic-plastic theory and the heat-balance theory, according to the principle of residual stress generation in cutting process. Based on the 2D finite element model of chip molding with separation surface, the direct way was applied in thermo-mechanical coupling, and residual stress of cutting GH4169 were simulated and analyzed by finite element. The results showed that the residual stresses are changed from tensile to compressive with the development of depth away from the workpiece surface. Also its values are changed according to a certain rule as varying the cutting speed. These provide a foundation for the control of cutting quality of workpiece.

Influence of Grinding Parameters on Residual Stress of Nano-ZrO2 Ceramics

2014 ◽  
Vol 1027 ◽  
pp. 119-122 ◽  
Author(s):  
Ming Li Zhao ◽  
Qiu Chen Guo ◽  
Bo Zhao
Keyword(s):  
Residual Stress ◽  
Grain Size ◽  
Martensitic Transformation ◽  
Tetragonal Phase ◽  
Compressive Residual Stress ◽  
Ground Surface ◽  
X Ray ◽  
Abrasive Grain ◽  
Grinding Parameters

Residual stress of ceramics ground surface was detected by the X-ray instrument, and it was analyzed in present paper. The experimental results show that the content of metastable tetragonal phase of ZrO2 and grinding stress are the primary factors which induce martensitic transformation on ZrO2 ceramics ground surface; during grinding the deeper the grinding depth is, and the bigger abrasive grain size is, the grinding stress in material matrix is larger. After analyzing the influence of grinding parameters on residual stress, it can be found that martensitic transformation can prompt the compressive residual stress to some extent, so as to improve the quality of ground surface.

Study on Influential Factors of Grinding Surface Residual Stress in Dry for Controlling Workpiece Surface Integrity

2016 ◽  
Vol 874 ◽  
pp. 362-367
Author(s):  
Xiu Ming Zhang ◽  
Shi Chao Xiu ◽  
Li Juan Liu ◽  
Xiao Liang Shi
Keyword(s):  
Residual Stress ◽  
Surface Integrity ◽  
Ground Surface ◽  
Element Model ◽  
Influential Factors ◽  
Grinding Process ◽  
Residual Tensile Stress ◽  
Surface Residual Stress ◽  
Workpiece Surface ◽  
Mechanical Field

Surface integrity of workpiece, especially residual stress, has the significant effects on the precision, the reliability and the fatigue life of the mechanical products. Since the most of final surface integrity of workpiece depends on the grinding process in engineering, this paper analyzed the ground surface residual stress through simulation and experiment. Based on the finite element model, the coupling of thermal mechanical field of plane grinding was simulated. The effects of grinding parameters on residual stress were studied compared to the experiment results. In addition, some measures for reducing the residual tensile stress of workpiece surface in the grinding process were put forwarded.

scholarly journals Study for the Design of a Protocol to Assess the Impact of Stress in the Quality of Life of Workers

2021 ◽  
Vol 18 (4) ◽  
pp. 1413
Author(s):  
Patricia Concheiro-Moscoso ◽  
Betania Groba ◽  
Francisco José Martínez-Martínez ◽  
María del Carmen Miranda-Duro ◽  
Laura Nieto-Riveiro ◽  
...  
Keyword(s):  
Quality Of Life ◽  
Occupational Stress ◽  
Categorical Variables ◽  
Complete Study ◽  
Stress Coping Strategies ◽  
Personal Level ◽  
Stress Influences ◽  
The Impact ◽  
Positive Effect

(1) Background: Work stress is one of the most relevant issues in public health. It has a significant impact on health, especially the development of mental disorders, causing occupational imbalance. There is a growing interest in the development of tools with a positive effect on workers. To this end, wearable technology is becoming increasingly popular, as it measures biometric variables like heartbeat, activity, and sleep. This information may be used to assess the stress a person is suffering, which could allow the development of stress coping strategies, both at a professional and personal level. (2) Methods: This paper describes an observational, analytical, and longitudinal study which will be set at a research center in A Coruña, Spain. Various scales and questionnaires will be filled in by the participants throughout the study. For the statistical analysis, specific methods will be used to evaluate the association between numerical and categorical variables. (3) Discussion: This study will lay the foundation for a bigger, more complete study to assess occupational stress in different work environments. This will allow us to begin to understand how occupational stress influences daily life activity and occupational balance, which could directly enhance the quality of life of workers if the necessary measures are taken.

Application of Machine Vision System in the Precision Inspection

2012 ◽  
Vol 546-547 ◽  
pp. 1382-1386
Author(s):  
Yin Xia Liu ◽  
Ping Zhou
Keyword(s):  
Machine Vision ◽  
Vision System ◽  
Machine Vision System ◽  
Technical Problems ◽  
Application Program ◽  
Precision Inspection ◽  
Machine Parts

In order to promote the application and development of machine vision, The paper introduces the components of a machine vision system、common lighting technique and machine vision process. And the key technical problems are also briefly discussed in the application. A reference idea for application program of testing the quality of the machine parts is offered.

Study on the Behavior of the Cast-Iron Bonded Grinding Wheel to Machining Properties of Hard and Brittle Materials

2007 ◽  
Vol 24-25 ◽  
pp. 229-232
Author(s):  
S.L. Ma ◽  
Wei Li ◽  
Cong Rong Zhu ◽  
J. Zhang ◽  
H.C. Ye
Keyword(s):  
Grain Size ◽  
Cast Iron ◽  
Tungsten Carbide ◽  
Surface Quality ◽  
Ground Surface ◽  
Grinding Wheel ◽  
Different Grain Size ◽  
Grinding Efficiency ◽  
Machining Properties

Tungsten carbide which is a hard and brittle material was ground by cast-iron bonded diamond wheel with ELID (Electrolytic In-Process Dressing) technique, for the purpose of getting high efficiency, super-precision machining. Three kinds of cast-iron bonded diamond wheels with different grain size were adopted to get different grinding efficiency and surface quality of workpieces. The grinding properties of cast-iron bonded grinding wheels with different grain size and the ground surface quality of tungsten carbide are discussed in this paper. The experiment results indicate that, under the same feeding amount, the grinding efficiency of the wheel with bigger grain size is higher, and it could make the dimension accuracy of the workpiece controllable, but the wheel with smaller grain size could get better ground surface quality. The two grinding phases are decided by the ratio between the size of abrasive grain and the thickness of the oxide layer on the grinding wheel.

Testing the Accuracy of Surface Roughness Measurements Carried out with a Portable Profilometer

2015 ◽  
Vol 637 ◽  
pp. 69-73 ◽  
Author(s):  
Krzysztof Stępień
Keyword(s):  
Surface Roughness ◽  
Measurement Accuracy ◽  
Environmental Changes ◽  
Experimental Tests ◽  
Evaluation Procedure ◽  
Human Errors ◽  
Modern Manufacturing ◽  
Machine Parts ◽  
Roughness Measurements

Surface roughness is a factor that has a vital influence on overall quality of machine parts. This is the reason why proper measurements of surface roughness are a matter of great importance in modern manufacturing technology. Nowadays portable profilometers are common instruments to be used under industrial conditions. Measurements with such instruments can be affected by numerous factors, for example environmental changes, human errors of an operator, etc. This paper discusses problem of an evaluation of measurement accuracy of portable profilometers. It also describes the evaluation procedure and presents results experimental tests.

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