Machined Surface Characteristics and Removal Mechanism of Soft and Brittle Solids

2010 ◽  
Vol 447-448 ◽  
pp. 183-187 ◽  
Author(s):  
Zhen Yu Zhang ◽  
Rudy Irwan ◽  
Han Huang
Keyword(s):  
Surface Characteristics ◽  
Abrasive Machining ◽  
Precision Grinding ◽  
Machined Surface ◽  
Brittle Solids ◽  
The Coefficient Of Friction ◽  
Ultra Precision ◽  
Ductile Removal ◽  
Fracture Features ◽  
Free Abrasive

Surface characteristics of CZT wafers machined using wire sawing, free abrasives lapping and polishing and ultra-precision grinding were investigated. Wire sawing resulted in the removal of material in both ductile and brittle regimes, but both polishing and grinding led to a ductile removal. The grinding produced very smooth surfaces free of embeddings and scratches, which is thus considered to have better machinability than the free abrasive machining. The nanoindentation and nanoscratch on MCT wafers at nanometric scales resulted in considerable plastic deformation, but no fracture features. The hardness of the MCT wafer was 500 to 550 MPa, and the coefficient of friction was particularly high, ranging from 0.45 to 0.55.

Research on ELID Ultra-Precision Grinding Performance of SiCp/Al Composites

2014 ◽  
Vol 614 ◽  
pp. 75-78
Author(s):  
Jia Liang Guan ◽  
Lei Zhu ◽  
Ling Chen ◽  
Xin Qiang Ma ◽  
Xiao Hui Zhang
Keyword(s):  
Surface Roughness ◽  
Cast Iron ◽  
Rotation Speed ◽  
Grinding Wheel ◽  
Feed Speed ◽  
Precision Grinding ◽  
Machined Surface ◽  
Elid Grinding ◽  
Machined Surface Roughness ◽  
Ultra Precision

The electrolytic in-process dressing (ELID) grinding technology was adopted for ultra-precision grinding experiments of SiCp/Al composites; the machined surface roughness can obtain Ra0.030μm. The experiments show that: with the grinding wheel rotation speed of 1500r/min, the grinding depth of 0.1μm, and feed speed of 2m/min and using W5 cast iron bonded diamond grinding wheel, the grinding effect can achieve optimal.

Correlation of 3-D Precision Machined Surface Topography With Frictional Response

2004 ◽  
Author(s):  
Ramesh Singh ◽  
Rick Kalil ◽  
Shreyes N. Melkote ◽  
Fukuo Hashimoto
Keyword(s):  
Three Dimensional ◽  
Surface Characteristics ◽  
Trial And Error ◽  
Machined Surface ◽  
Topographic Analysis ◽  
Amplitude Parameter ◽  
Surface Finishes ◽  
Rolling Elements ◽  
The Coefficient Of Friction ◽  
Effect Of Surface

Precision surface finishes are used in a wide variety of applications. From bearing races and rolling elements to parallel slide ways, the functional characteristics of these surfaces are critical to their performance. Experimental trial and error has shown that certain surfaces outperform others in certain applications, but the specific surface characteristics that make this true are yet to be fully understood. The present paper addresses this issue through a detailed three-dimensional topographic analysis of different precision finished surfaces and correlation with their frictional response. Experiments are conducted to investigate the effect of surface type (Isotropic Finished, Ground, Hard Turned and Honed) and relative surface speed on the coefficient of friction in rolling/sliding contact. Utilizing white light interferometry measurement of the surfaces, different 3-D topographic parameters such as RMS deviation, density of summits and texture direction are obtained and their correlation with the experimentally obtained coefficients of friction is examined. Results show that the 3-D amplitude parameter Sq (RMS deviation of surface) and spatial parameter Sds (density of summits) play an important role in determining the frictional behavior of the surfaces studied.

Research on ELID Grinding Performance of GCr15 Steel

2013 ◽  
Vol 797 ◽  
pp. 740-745
Author(s):  
Jia Liang Guan ◽  
Xin Qiang Ma ◽  
Xiao Hui Zhang ◽  
Li Li Zhu ◽  
Zhi Wei Wang
Keyword(s):  
Surface Roughness ◽  
Bearing Steel ◽  
Precision Grinding ◽  
Machined Surface ◽  
Elid Grinding ◽  
Peripheral Velocity ◽  
Gcr15 Bearing Steel ◽  
Machined Surface Roughness ◽  
Ultra Precision ◽  
Main Factors

The electrolytic in-process dressing (ELID) grinding technology was adopted for ultra-precision grinding experiments of GCr15 bearing steel. The experiments show that: grinding depth, electrolysis gap and wheel peripheral velocity are the main factors to affect the surface quality. With the electrolysis gap of 0.5mm, the grinding depth of 0.1μm, and the wheel peripheral velocity of 18m/s, the grinding effect can achieve optimal and the machined surface roughness can obtain Ra0.006μm.

Manufacturing Technology of α-Fe Bonded Grinding Wheel Free Abrasive

2018 ◽  
Vol 780 ◽  
pp. 111-115 ◽  
Author(s):  
Ji Cai Kuai ◽  
Dmitrii V. Ardashev ◽  
Jia Qi Zhang ◽  
Hua Li Zhang
Keyword(s):  
Oxide Film ◽  
High Surface ◽  
Grinding Wheel ◽  
Mirror Surface ◽  
Precision Grinding ◽  
Abrasive Particles ◽  
Elid Grinding ◽  
Abrasive Grain ◽  
Ultra Precision ◽  
Free Abrasive

ELID ultra-precision grinding mirror surface can achieve nanometer precision. However, after the grinding wheel passivates the abrasive particles in electrolysis, it is easy to scratch the ultra-precision ELID grinding surface into the grinding process. In order to solve this problem, a non-abrasive grain α-Fe bonded grinding wheel is propose, which contains no abrasive particles. After electrolysis, oxide film is formed on the surface of the wheel. In ultra-precision ELID grinding, there is no abrasive particles involved, only the polishing effect of oxide film. There is no need to worry about the scratching of exfoliated abrasive particles that have been machined on ultra-precision ELID surfaces. Thus achieving extremely high surface accuracy.

scholarly journals Ultra-High-Speed Magnetic Abrasive Surface Micro-Machining of AISI 304 Cylindrical Bar

Metals ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 489 ◽  
Author(s):  
Cheng Yin ◽  
Rui Wang ◽  
Jeong Kim ◽  
Sang Lee ◽  
Sang Mun
Keyword(s):  
Surface Roughness ◽  
Plastic Strain ◽  
High Speed ◽  
Precision Machining ◽  
Plastic Strains ◽  
Abrasive Machining ◽  
Machined Surface ◽  
Aisi 304 ◽  
Ultra High Speed ◽  
Ultra Precision

The ultra-high-speed magnetic abrasive machining (UHSMAM) process is a surface improvement technique, which has been widely used to minimize the surface accuracy and change the precision morphology of difficult-to-machine materials. Surface integrity plays an important role in the machining process, because it is used to evaluate the high stress and the loaded components on the machined surface. It is important to evaluate the plastically deformed layers in ultra-precision machining surface of material. However, the usual plastic strains in the ultra-precision machining surface are significantly difficult to consider. In this paper, an ultra-high-speed magnetic abrasive machining technique is used to improve the surface accuracy and dimensional accuracy of an AISI 304 bars. Additionally, the subsequent recrystallizations technique is used for measuring the plastic strain on machined surface of AISI 304 bars. The purpose of this paper is to evaluate the effects of an UHSMAM process on the plastic strains and the strain energy of the machined surface, and to evaluate the residual strain in the plastic deformation of AISI 304 bars materials by analyzing a plastically deformed layer. The results showed that the plastic strain of the material did not change after machined by an UHSMAM process. Based on the results, an UHSMAM process could significantly improve the surface roughness, micro-diameter, and removal weight of AISI 304 bars effectively. The surface roughness Ra of AISI 304 bars was improved from 0.32 µm to 0.03 µm for 40 s of machining time at 80,000 rpm of workpiece revolution speed.

Research on Cylindrical Precision Machining Adopting ELID Grinding Technology

2014 ◽  
Vol 1027 ◽  
pp. 97-100 ◽  
Author(s):  
Jia Liang Guan ◽  
Xiao Hui Zhang ◽  
Ling Chen ◽  
Xin Qiang Ma
Keyword(s):  
Wheel Speed ◽  
Process Equipment ◽  
Precision Machining ◽  
Precision Grinding ◽  
Machined Surface ◽  
Elid Grinding ◽  
Optimization Of Process Parameters ◽  
Ultra Precision ◽  
Efficient Processing ◽  
Mirror Grinding

In order to explore the new way to precision machining of the cylindrical, ELID precision mirror grinding technology are employed to precision ultra-precision grinding experiments. Given ELID precision mirror grinding technology has effectively solved the basis of many of the typical flat-precision machining difficult materials and efficient processing, through the conversion process equipment tools, and optimization of process parameters, obtained when the wheel speed in 16 ~ 20 m / s, when the grinding depth 10μm, cylindrical grinding state is best, which could obtain Ra0.025μm surface roughness of the machined surface.

EDM with USM Combination Process of Sintered NdFeB Permanent Magnet

2010 ◽  
Vol 44-47 ◽  
pp. 1066-1069
Author(s):  
Li Li ◽  
Li Ling Qi ◽  
Zong Wei Niu
Keyword(s):  
Permanent Magnet ◽  
Material Removal ◽  
Removal Rate ◽  
Surface Characteristics ◽  
Dielectric Fluid ◽  
Machined Surface ◽  
Combination Process ◽  
Electro Discharge Machining ◽  
Ndfeb Permanent Magnet ◽  
Machining Characteristics

This paper presents an experimental investigation of the machining characteristics of sintered NdFeB permanent magnet using a combination process of electro-discharge machining (EDM) with ultrasonic machining (USM). Concentration of abrasive in the dielectric fluid is changed to explore its effect on the material removal rate (MRR). MRR of EDM /USM, conventional EDM are compared, machined surface characteristics are also compared between them. It is concluded that the combination EDM/USM process can increase the MRR and decrease the thickness of the recast layer. In the combination process, an appropriate abrasive concentration can improve its machining efficiency.

Sign in / Sign up

Export Citation Format

Share Document