Study on Grinding Crack of Premium Thread Gauge Material 9Mn2V

2013 ◽  
Vol 589-590 ◽  
pp. 252-257
Author(s):  
Ming Chen ◽  
Da Peng Dong ◽  
Guo Qiang Guo ◽  
Qing Long An
Keyword(s):  
Residual Stress ◽  
Surface Integrity ◽  
Heat Affected Zone ◽  
Surface Grinding ◽  
Surface Residual Stress ◽  
Specific Grinding Energy ◽  
Grinding Burn ◽  
Metallographic Structure

This paper investigates the surface integrity of premium thread gauge material 9Mn2V in reciprocating surface grinding using SG abrasive, which includes metallographic structure for grinding crack, specific grinding energy and surface residual stress. The specific grinding energy and the surface residual stress can be reduced after the workpiece gets tempered, so small grinding depth can lead to the generation of cracks when the workpiece is not tempered. Otherwise, the depth of heat affected zone increases with the increase of grinding depth, but not increases proportionally. After 9Mn2V is tempered, the occurrence of grinding burn and grinding cracks can be improved.

Investigation on surface residual stress distribution and evaluation of engineering ceramics in rotary ultrasonic grinding machining

2016 ◽  
Vol 231 (15) ◽  
pp. 2773-2782 ◽  
Author(s):  
SL Wei ◽  
H Zhao ◽  
JT Jing ◽  
FH Yun ◽  
XL Li
Keyword(s):  
Residual Stress ◽  
Stress Distribution ◽  
Stress Tolerance ◽  
Surface Integrity ◽  
Residual Stress Distribution ◽  
Distribution Model ◽  
Surface Residual Stress ◽  
Machined Surface ◽  
Engineering Ceramics ◽  
Ultrasonic Grinding

Residual stress of engineering ceramics is one of surface integrity evaluation indexes affecting the parts’ strength properties. Rotary ultrasonic grinding machining is the most powerful machining method for engineering ceramics with better surface integrity. The residual stress field distribution is changed due to micro cracks which are inevitable in the process. A residual stress distribution model of machined surface micro crack tip has been established in the paper. And the experimental results enable us to obtain surface residual stress distribution of engineering ceramics in rotary ultrasonic grinding machining. Then, we propose an evaluation parameter called confidence stress tolerance to evaluate surface residual stress characteristic. Preliminary results indicate that surface residual stress distribution is in line with the normal distribution. Confidence stress tolerance is an effective parameter to improve the evaluation reliability. Furthermore, precision and affecting factors of confidence stress tolerance evaluation have also been investigated.

Experimental Investigation on the Surface Integrity of Titanium Alloy TC4 in Abrasive Belt Grinding

2013 ◽  
Vol 716 ◽  
pp. 185-190
Author(s):  
He Ping Wei ◽  
Yun Huang ◽  
Zhao Yang Liu
Keyword(s):  
Residual Stress ◽  
Experimental Investigation ◽  
Titanium Alloy ◽  
Surface Integrity ◽  
Cutting Speed ◽  
Velocity Range ◽  
Belt Grinding ◽  
Surface Residual Stress ◽  
Abrasive Belt ◽  
Surface Burn

This paper aimed at that titanium alloy grinding is easy to appear surface burn, crack, then carry out the titanium alloy TC4 abrasive belt grinding experiment, focus on the effect of grinding parameters on the titanium alloy TC4 surface integrity (surface roughness, microstructure and surface residual stress) . The results of the study show that the use of zircon corundum belt and cutting speed velocity range from 18 to 26 meter per second, the surface integrity of titanium alloy TC4 is better.

Analysis of the Surface Residual Stress in Grinding Aermet100

2011 ◽  
Vol 704-705 ◽  
pp. 318-324
Author(s):  
Y.Q. Xu ◽  
T. Zhang ◽  
Y.M. Bai
Keyword(s):  
Residual Stress ◽  
Plastic Deformation ◽  
Thermal Expansion ◽  
Tensile Stress ◽  
Heat Source ◽  
Residual Stresses ◽  
Surface Grinding ◽  
Grinding Process ◽  
Surface Residual Stress ◽  
Abrasive Grains

Grinding induces residual stresses, which can play an important role on the fatigue of the component. In general, residual stresses in a ground surface are primarily generated due to three effects: thermal expansion and contraction during grinding, plastic deformation caused by the abrasive grains of the wheel and phase transformations due to high grinding temperature. It was found that thermal expansion and plastic deformation in the grinding process were the major causes of residual stresses. In this paper, an analysis model for the calculation of residual stresses induced by a surface grinding process on an ultrahigh-strength steel (Aermet100) workpiece is presented. Firstly, the stress distribution induces by thermal expansion was obtained base on the transient heat conduction equation and the thermal properties of Aermet100. All the calculations were based on the moving heat source solution which was modeled as a uniformly distributed, 2D heat source moving across the surface of a half-space, found in Carslaw and Jaeger. The results show that the near surface residual stress is predominantly tensile and that the magnitude of this stress increases with increasing heat flux values. Secondly, the plastic deformation caused by the abrasive grains of the wheel was simulated base on the grain-workpiece interaction. The chip formation process and the material removal mechanisms can be examined using the micro-scale approach. The results show that the residual stress induced by the grinding force itself is generally compressive which is smaller than the residual tensile stress induced by thermal stress. Therefore, the residual stress brought about by grinding operation is generally a tensile stress. This paper offers an insight into the mechanism understanding of thermal and mechanical residual stresses induced by surface grinding. Key words: grinding, residual stress, grain

Investigation of Surface Integrity in Conventional Grinding of Ti-6Al-4V

2010 ◽  
Vol 126-128 ◽  
pp. 899-904 ◽  
Author(s):  
Guo Giang Guo ◽  
Zhi Qiang Liu ◽  
Xiao Jiang Cai ◽  
Qing Long An ◽  
Ming Chen
Keyword(s):  
Residual Stress ◽  
Surface Roughness ◽  
Surface Integrity ◽  
Ground Surface ◽  
Surface Residual Stress ◽  
Machined Surface ◽  
Conventional Grinding ◽  
Metallurgical Structure ◽  
Mechanical Factors ◽  
Deformation Layer

This paper investigates the surface integrity of Ti-6Al-4V in conventional grinding using SiC abrasive, it includes surface roughness, surface topography, surface residual stress and metallurgical structure alteration. The experiment result indicated that grinding depth and feed rate have significant effect on surface roughness. Workpiece ground surface was free of crack, but severe plastic deformation layer and light burn appeared because of chemical reactions and mechanical factors. Ground surface was in a state of high tensile residual stress, thermal cycling of surface layer had the greatest effect. The machined surface experienced microstructure alteration on the top layer of ground surface, a heat-affected zone (HAZ) was observed.

Experimental Research on Surface Residual Stress of Quenched GCr15 Steel in Ultrasonic Aided Turning

2013 ◽  
Vol 797 ◽  
pp. 657-662
Author(s):  
Feng Jiao ◽  
Xiang Liu ◽  
Chong Yang Zhao ◽  
Xiong Zhang
Keyword(s):  
Residual Stress ◽  
Compressive Stress ◽  
Surface Integrity ◽  
Hard Turning ◽  
Cutting Speed ◽  
Residual Compressive Stress ◽  
Depth Of Cut ◽  
Surface Residual Stress ◽  
Machined Surface ◽  
Gcr15 Steel

Surface residual stress has become one of the important indexes measuring surface integrity in hard turning of precision parts. The type of surface residual stress and the influence rules of cutting parameters on surface residual stress in hard turning of GCr15 steel are studied in this paper. Research results show that no matter in common or ultrasonic turning, tangential surface residual compressive stress can be found in machined surface. The effect of cutting speed on the residual compressive stress is the greatest, the effect of feed rate takes the second place and the effect of depth of cut is minimal. The conclusions have provided experimental basis for enhancing the surface integrity of quenched GCr15 steel precision parts.

A New Perspective of Residual Stress Induced by Machining and Grinding

1999 ◽  
Author(s):  
C. Richard Liu ◽  
Xiaoping Yang
Keyword(s):  
Residual Stress ◽  
Surface Integrity ◽  
Single Point ◽  
High Surface ◽  
Potential Hazard ◽  
Surface Residual Stress ◽  
Small Surface ◽  
Factors Affecting ◽  
Point To Point ◽  
Stress Variations

Abstract Residual stress is one of the most important factors affecting product surface integrity. Every machining operation produces a distinctive residual stress in the surface layer. The surface residual stress produced by grinding and face turning were measured in very small surface areas at several locations of each sample using X-Ray diffraction technique. Significant point-to-point residual stress variations were found in the ground surfaces, which poses a potential hazard to applications requiring high surface integrity. On the other hand, only small point-to-point residual stress variations were found in the face turned surface. An explanation to this phenomenon has been given. Residual stress on seven samples undergone multiple-pass grinding were also measured, the results of which show that final residual stress distribution on a ground workpiece depends on the initial residual stress, the number of grinding pass, as well as grinding conditions. It is suggested that single-point cutting be used in place of abrasive grinding.

Development of Non-Destructive Inspection System for Grinding Burn - An Application of the Grinding Burn Detecting Technique to Evaluate Residual Stress

2013 ◽  
Vol 797 ◽  
pp. 307-312
Author(s):  
Ryo Ito ◽  
Takayuki Azuma ◽  
Tomoyuki Kasuga ◽  
Shinji Soma ◽  
Shinji Murakami ◽  
...  
Keyword(s):  
Residual Stress ◽  
Low Cost ◽  
Detection Technique ◽  
Inspection Time ◽  
Current Sensor ◽  
Inspection System ◽  
Work Piece ◽  
Surface Residual Stress ◽  
Grinding Burn ◽  
Non Destructive

This study was performed to develop a non-destructive inspection system to detect grinding burn, which is capable of quantitative 100% inspection inside a production line. An eddy current sensor, which has advantages of short inspection time and low cost, was used. It was shown that the grinding burn detection technique had been developed and is possible to detect grinding burn by using this technique, in the 1st report1) and the 2nd report2). In this report, we have attempted to apply the grinding burn detection technique to evaluate the residual stress of work piece surface. Residual stress of work piece surface is affected by both thermal and mechanical effects. It is shown that the residual stress is possibly evaluated in the case of the thermal effect is dominant.

Experimental Investigation on Grinding Surface Condition of 9Mn2V under Different Tempering Processes

2012 ◽  
Vol 565 ◽  
pp. 88-93
Author(s):  
Ming Chen ◽  
Da Peng Dong ◽  
Guo Giang Guo ◽  
Qing Long An
Keyword(s):  
Residual Stress ◽  
Surface Roughness ◽  
Experimental Investigation ◽  
Energy Surface ◽  
Surface Condition ◽  
Ground Surface ◽  
Micro Hardness ◽  
Surface Residual Stress ◽  
Specific Grinding Energy ◽  
The Times

This paper investigates the surface condition of 9Mn2V in conventional surface grinding using SG abrasive under different tempering processes, which includes metallographic structure, micro-hardness, specific grinding energy, surface roughness, surface morphology and surface residual stress. The experimental results indicated that the specific grinding energy increased after the completion of tempering. The ground surface quality improved evidently with the times of tempering increasing. Meanwhile the ground surface was in a state of high tensile residual stress after quenching. After the second time of tempering, the residual stress had significantly been reduced.

The Cutting Residual Stress Included in the Surface Integrity

2014 ◽  
Vol 893 ◽  
pp. 638-643
Author(s):  
Juan Huang ◽  
Gui Cheng Wang
Keyword(s):  
Residual Stress ◽  
Stress Distribution ◽  
Surface Integrity ◽  
Cutting Parameters ◽  
Residual Stress Distribution ◽  
Distribution Law ◽  
Surface Residual Stress ◽  
Machined Surface ◽  
Cutting Surface ◽  
Experimental Researches

This article is for the integrity of the cutting surface, explaining the reason for the cutting residual stress generated from the mechanism, proposed several typical methods to reduce the residual stress. According to some experimental researches on cutting parameters which have been done by previous scholars, this article gives some analysis of the effects of cutting parameters of residual stress. And preliminary summary of the influence of residual stress on cutting parameters, it also provides a way for further discussion of cutting parameters and material effect on the machined surface residual stress distribution law.

Simulation of Ground Surface Residual Stress for Surface Integrity in Small Depth of Cut

2014 ◽  
Vol 1027 ◽  
pp. 115-118
Author(s):  
Xiu Ming Zhang ◽  
Li Juan Liu ◽  
Shi Chao Xiu
Keyword(s):  
Residual Stress ◽  
Surface Integrity ◽  
Ground Surface ◽  
Element Model ◽  
Depth Of Cut ◽  
Surface Residual Stress ◽  
Mechanical Coupling ◽  
Small Depth ◽  
Mechanical Products ◽  
The Finite Element Model

The surface residual stress and integrity of workpiece have significant effects on the precision, the reliability and the fatigue life of the mechanical products. Since the most final surface integrity of workpiece depends on the grinding process mainly in engineering, this paper analyzed the surface residual stress of ground surface through the simulation works. Based on the finite element model and the thermal mechanical coupling field of the surface grinding for 45 steel was simulated and analyzed. The distribution of the residual stress and the effects of grinding parameters on residual stress were discussed. In addition, the measures for improving the residual stress in ground surface were put forward.

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