Study of Magnetorheological Brush Finishing (MRBF) for Concave Surface of Conformal Optics

2012 ◽  
Vol 497 ◽  
pp. 170-175
Author(s):  
Yun Zhang ◽  
Jing Feng Zhi ◽  
Yue Wang Yu ◽  
Xu Xing Zhu ◽  
Wei Zuo
Keyword(s):  
Surface Roughness ◽  
Stainless Steel ◽  
Surface Damage ◽  
Aspheric Surface ◽  
Precision Turning ◽  
Good Surface ◽  
Steel Material ◽  
Stainless Steel Material ◽  
Ultra Precision ◽  
Magnetorheological Polishing

Stainless steel; Aspheric mould; Ultra-precision turning; Magnetorheological polishing The ultra precision turning and the inclined-axis type of magnetorheological polishing were introduced for the small aspheric mould of stainless steel. The method was based on the principle of two kinds of processing methods, and the processing feature of stainless steel material. Firstly, the ultra-precision turning was employed to shape aspheric surface rapidly and obtain a relatively good surface. And then, the inclined-axis type of magnetorheological polishing as the final finishing was used to decrease sub-surface damage to obtain better precision. Several of experiments were carried out, the experimental results show that surface roughness can be achieved for Ra 0.0073μm.

The Composite Ultra-Precision Processing Technology for the Small Aspheric Mould of Stainless Steel

2012 ◽  
Vol 497 ◽  
pp. 176-179
Author(s):  
Shao Hui Yin ◽  
Zhi Qiang Xu ◽  
Jian Wu Yu
Keyword(s):  
Surface Roughness ◽  
Stainless Steel ◽  
Surface Damage ◽  
Aspheric Surface ◽  
Precision Turning ◽  
Good Surface ◽  
Steel Material ◽  
Stainless Steel Material ◽  
Ultra Precision ◽  
Magnetorheological Polishing

Stainless steel; Aspheric mould; Ultra-precision turning; Magnetorheological polishing Abstract. The ultra precision turning and the inclined-axis type of magnetorheological polishing were introduced for the small aspheric mould of stainless steel. The method was based on the principle of two kinds of processing methods, and the processing feature of stainless steel material. Firstly, the ultra-precision turning was employed to shape aspheric surface rapidly and obtain a relatively good surface. And then, the inclined-axis type of magnetorheological polishing as the final finishing was used to decrease sub-surface damage to obtain better precision. Several of experiments were carried out, the experimental results show that surface roughness can be achieved for Ra 0.0073μm.

Study of Etch Rate and Surface Roughness in Chemical Etching of Stainless Steel

2007 ◽  
Vol 364-366 ◽  
pp. 837-842 ◽  
Author(s):  
Orhan Çakır
Keyword(s):  
Surface Roughness ◽  
Stainless Steel ◽  
Hydrochloric Acid ◽  
Ferric Chloride ◽  
Chemical Etching ◽  
Etch Rate ◽  
Steel Material ◽  
Stainless Steel Material ◽  
Iron Based ◽  
Etching Parameters

In this study, stainless steel material (X5CrNi1810) was micromachined by chemical etching method. Ferric chloride was selected as etchant which is the most widely used etchant for iron-based materials. Four different etchant concentrations (32 °Bé, 36 °Bé, 40 °Bé and 44 °Bé) were used at various etching temperature. Moreover, the influence of the addition of hydrochloric acid to main etchant on etching performance was examined. The aim of this study was to investigate the depth of etch and surface roughness affected by etchant concentration, hydrochloric acid addition and etching temperature. It was observed that etching temperature for any etchant concentration is important factor in case of depth of etch and surface roughness. It was also noticed that the addition of hydrochloric acid to main etchant increased depth of etch value at any etching temperature. The optimum etching parameters were obtained for the chemical etching of stainless steel.

Comparison of Processing Features between Semi Bonded Abrasive Lapping and Loose Abrasive Lapping

2009 ◽  
Vol 416 ◽  
pp. 439-442
Author(s):  
Xun Lv ◽  
Ju Long Yuan ◽  
Dong Hui Wen
Keyword(s):  
Surface Roughness ◽  
Material Removal Rate ◽  
Material Removal ◽  
Removal Rate ◽  
Processing Parameters ◽  
Good Surface ◽  
Ultra Precision ◽  
New Processing ◽  
Short Time

Semi bonded abrasive lapping is an effective ultra-precision lapping method. It can obtain good surface quality of workpiece in short time. This paper focused on the differences of processing features by comparing semi bonded abrasive lapping and loose abrasive lapping in several groups processing parameters. The results showed that the surface roughness of workpiece in semi bonded abrasive lapping was far superior to that of loose abrasive lapping in same processing parameters. And the MRR (material removal rate) of semi bonded abrasive lapping was slightly lower than that of loose abrasive lapping. For these features of semi bonded abrasive, a new processing flow would also be proposed in this paper.

Application of the First Higher-Order (M21) Mode Rayleigh Wave to the Inspection of Stainless Steel Overlays

1990 ◽  
Vol 112 (3) ◽  
pp. 298-301 ◽  
Author(s):  
D. E. Bray
Keyword(s):  
Stainless Steel ◽  
Point Contact ◽  
Base Material ◽  
Higher Order ◽  
Inspection Method ◽  
High Frequencies ◽  
Steel Material ◽  
Welding Defects ◽  
Stainless Steel Material ◽  
Probe Placement

Efficient inspection of stainless steel overlays appears to present a particularly challenging problem due to the anisotropy that is characteristic of that material. An improved inspection technique may be available, however, when the dissimilar properties of the overlay and the base material are utilized. Higher order mode Rayleigh waves which at high frequencies remain confined to the upper layer of the stainless steel material are demonstrated to be able to detect welding defects in the overlay material in a field some distance away from the probe. With this technique, a larger area may be scanned with each probe placement rather than the point contact probe inspection method that is typically used.

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