Research on Influence of the Material Anisotropy to the Surface Quality during SPDT Machining of Crystal KDP

2006 ◽  
Vol 532-533 ◽  
pp. 209-212 ◽  
Author(s):  
Ming Jun Chen ◽  
Ying Chun Liang ◽  
Jing He Wang ◽  
Xin Zhou Zhang
Keyword(s):  
Theoretical Analysis ◽  
Machine Tool ◽  
Cutting Force ◽  
Surface Quality ◽  
Smooth Surface ◽  
Precision Machining ◽  
Optimal Parameters ◽  
Material Anisotropy ◽  
Crystal Anisotropy ◽  
Ultra Precision

A theoretical analysis on the variation regularity of cutting force caused by the material anisotropy with different orientation of KDP is analyzed firstly; influence and regularity of the variation are obtained. Analysis result shows that the crystal anisotropy of KDP is an important factor in obtaining the super-smooth surface. Then experiments are realized on the machine tool, results afford the variation regularity of cutting force caused by the anisotropy with different orientation of KDP, which certifies the correctness of this theoretical analysis. For ultra-precision machining of the KDP at large negative rake diamond cutter (-45°) and the optimal parameters, the super-smooth surface (rms is 8.702 nm, Ra is 6.895 nm) can be obtained on the plane (001).

Study on the Effect of Rake Angle on Cutting Forces in Ultra-Precision Machining

2012 ◽  
Vol 516 ◽  
pp. 551-556
Author(s):  
Thanh Hung Duong ◽  
Kim Huyn Chul ◽  
Lee Dong Yoon
Keyword(s):  
Theoretical Analysis ◽  
Cutting Force ◽  
Electroless Nickel ◽  
Cutting Parameters ◽  
Rake Angle ◽  
Precision Machining ◽  
Reported Study ◽  
Ultra Precision ◽  
The Relationship ◽  
Cutting Speeds

In recent years, there have been many studies concerning the effect of cutting parameters and tool parameters on the ultra precision machining of electroless nickel. However, there is no known reported study on the relationship between the cutting force and tool rake angle in ultra precision machining of electroless nickel. The objective of this study is to compare and investigate the cutting force with various rake angles for micro machining electroless nickel work pieces by theoretical analysis and experiment. Diamond tools with rake angles of-10o, 0o and 10o were used in the experiment. According to theoretical analysis, the tool with a 10o rake angle induces the smallest cutting force. However, the experiment showed that the tool with zero rake angle always gave us the smallest cutting force for all cutting speeds, cutting depths and pattern pitches.

Characterization of Cutting-Induced Heat Generation in Ultra-Precision Milling of Aluminium Alloy 6061

2013 ◽  
Vol 552 ◽  
pp. 201-206
Author(s):  
Su Juan Wang ◽  
Suet To ◽  
Xin Du Chen
Keyword(s):  
Surface Roughness ◽  
Surface Quality ◽  
Heat Generation ◽  
Feed Rate ◽  
Dimensional Accuracy ◽  
Precision Machining ◽  
Machined Surface ◽  
Single Crystal Diamond ◽  
Ultra Precision ◽  
Alloy 6061

The technology of ultra-precision machining with single crystal diamond tool produces advanced components with higher dimensional accuracy and better surface quality. The cutting-induced heat results in high temperature and stress at the chip-tool and tool-workpiece interfaces therefore affects the materials and the cutting tool as well as the surface quality. In the ultra-precision machining of al6061, the cutting-induced heat generates precipitates on the machined surface and those precipitates induce imperfections on the machined surface. This paper uses the time-temperature-precipitation characteristics of aluminum alloy 6061 (al6061) to investigate the effect of feed rate on the cutting-induced heat generation in ultra-precision multi-axis milling process. The effect of feed rate and feed direction on the generation of precipitates and surface roughness in ultra-precision raster milling (UPRM) is studied. Experimental results show that heat generation in horizontal cutting is less than that in vertical cutting and a larger feed rate generates more heat on the machined workpiece. A smaller feed rate produces a better surface finish and under a larger feed rate, scratch marks are produced by the generated precipitates and increase surface roughness.

Machine Integrated Measurement of Ultra Precision Machined Specular Non-Rotational Symmetrical Surfaces

2014 ◽  
Vol 907 ◽  
pp. 277-289 ◽  
Author(s):  
Eckart Uhlmann ◽  
Gerhard Häusler ◽  
Christian Röttinger ◽  
Evelyn Olesch ◽  
Christian Faber ◽  
...  
Keyword(s):  
Machine Tool ◽  
Optical Measurement ◽  
Installation Space ◽  
Precision Machining ◽  
Test Surface ◽  
Full Field ◽  
Rotationally Symmetric ◽  
Ultra Precision ◽  
Height Data

In this paper, current results of a research project combining ultra precision machining and optical measurement are presented. The goal is to improve the quality of specular freeform surfaces manufactured by ultra precision slow slide servo turning by running appropriate correction cycles on the basis of machine integrated measurements. These measurements are conducted using the principle of Phase Measuring Deflectometry (PMD) in order to optically acquire full-field 3D-height data. For this purpose, a special setup the so called Mini PMD that can be operated within the limited installation space of an ultra precision machine tool has been designed and implemented. Results of machine integrated measurements of a specular non-rotational symmetrical surface are presented. Furthermore, using Mini PMD and a rotationally symmetric test surface, a complete correction cycle is demonstrated without the necessity of taking the workpiece off the machine for measurement.

Binderless-cBN as Cutting Material for Ultra-Precision Machining of Stainless Steel

2014 ◽  
Vol 1018 ◽  
pp. 107-114 ◽  
Author(s):  
Julian Polte ◽  
Mitchel Polte ◽  
David Lorenz ◽  
Dirk Oberschmidt ◽  
Heinz Sturm ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Surface Quality ◽  
Wear Mechanisms ◽  
Machine Tools ◽  
Experimental Studies ◽  
High Potential ◽  
Precision Machining ◽  
Workpiece Material ◽  
Ultra Precision ◽  
Direct Cutting

The ultra–precision cutting of steel materials is possible but needs modifications of machine tools or the workpiece material. One approach of actual research is the development of cutting materials that gives the opportunity for direct cutting of surfaces with ultra–precision quality. Binderless–cBN is here one of the most promising materials. The paper shows results of experimental studies with binderless–cBN as cutting material while turning stainless steel. Various investigations were carried out to determine the wear mechanisms. Furthermore, measurements are shown regarding the surface quality. The achieved results show the high potential ofbinderless–cBN as cutting material for the machining of steel.

Finite Element Analysis and Optimization of Thermal Deformation of Resin Concrete Manufacturing Bases

2014 ◽  
Vol 543-547 ◽  
pp. 4010-4013
Author(s):  
Yao Chen ◽  
Xiu Xia Liang ◽  
Shuang Qiu
Keyword(s):  
Thermal Stability ◽  
Machine Tool ◽  
Thermal Deformation ◽  
Precision Machining ◽  
Element Analysis ◽  
Excellent Thermal Stability ◽  
Good Thermal Stability ◽  
Machining Center ◽  
Ultra Precision ◽  
Thermal Stability Of

Resin concrete generally has good mechanical properties, excellent thermal stability and great vibration resistance, the model of the ultra-precision machining center bed is established to study the thermal stability of the resin concrete using virtual reality and collaborative simulation technology based on Pro/E and ANSYS Workbench. The main factors that affect the machine tool bed thermal deformation were found through analyzing the deformation results and the materials and restrain conditions were optimized. The results proved that the optimized machine tool bed has good thermal stability and theoretical basis was provided to improve the thermal stability of the ultra-precision machining centers.

The Theoretical Analysis and Application of the Ultra-Precision Machining the End Surface of Stop Valve’s Valve Flap with the Diamond Facing Tool

2013 ◽  
Vol 652-654 ◽  
pp. 2113-2118
Author(s):  
Ji Hua Zhu ◽  
Xue Xia Liu ◽  
Xue Min Tian ◽  
Jian Fei Chen
Keyword(s):  
Stainless Steel ◽  
Theoretical Analysis ◽  
Cutting Parameters ◽  
Precision Machining ◽  
Grinding Wheel ◽  
Quality Requirements ◽  
Machinery Factory ◽  
New Process ◽  
The Face ◽  
Ultra Precision

A new process was proposed. The disadvantage of of using brown alumina grinding wheel to grinding and lapping surface was studied in the analysis. The diamond facing tool was designed and manufactured with the solution of the key technique of the critical technical of single crystal diamond’s material selecting, grinding, welding. The face cutting parameters: “V”, “f” and “ap” were measured by experiment and academic analysis. Tt can fully meet the quality requirements of stainless steel valve flap’s surface used by one valve machinery factory; meanwhile the productivity was increased by a factor of 15, with overcoming the disadvatange of grinding and lapping valve flap’s surface.

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