Experimental Investigation on Diamond Drilling of Potassium Di-Hydrogen Phosphate (KDP) Crystal

KDP (potassium di-hydrogen phosphate) crystal is used to fabricate important electro-optic parts. It is a typical hard-to-machine material because it is soft, brittle, and anisotropic. Parts made of KDP usually have extremely high requirements for machining quality. Reported machining methods so far for KDP crystal include single point diamond turning, grinding, magnetorheological finishing, and polishing. This paper presents an experimental investigation on diamond drilling of KDP. Data of several output parameters (including grinding force and torque, surface roughness, and edge chipping) were collected and analyzed. Ultrasonic vibration was superimposed to the rotation of the tool to study its effects.

Download Full-text

Simulation of Large Scale KDP Crystal Polishing by Computer Controlled Micro-Nano Deliquescence

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.497.165 ◽

2012 ◽

Vol 497 ◽

pp. 165-169 ◽

Cited By ~ 3

Author(s):

He Ping Zhang ◽

Dong Ming Guo ◽

Xu Wang ◽

Hang Gao

Keyword(s):

Large Scale ◽

Surface Condition ◽

Single Point ◽

Damage Threshold ◽

Diamond Turning ◽

Water Soluble ◽

Optical Elements ◽

Kdp Crystal ◽

Computer Controlled ◽

Laser Induced Damage

Although Single Point Diamond Turning (SPDT) can do pretty well in optical surfacing of large scale KDP crystal, both the surface accuracy and integrity are considerably high; meanwhile as the defects of micro-waveness and stress are inevitable, the laser-induced damage threshold of KDP optical elements after SPDT still cannot be satisfied. Because of the characters of deliquescent and water-soluble, the process of computer controlled Micro-nano deliquescence is attempted to remove the residual micro-waveness on KDP surface after SPDT. Based on the assumption of Preston and the characters of Micro-nano deliquescence, the model of material removal ratio is suggested, the dwell time for ascertained KDP surface is solved, the processing of computer controlled Micro-nano deliquescence is simulated and the processed surface condition on theory is obtained. Besides, the influences of different parameters on the surfacing efficiency and accuracy are analyzed. Finally, three polishing tracks are comparatively analyzed. The simulation results are quite important in guiding the experimental polishing of large scale KDP by computer controlled Micro-nano deliquescence

Download Full-text

Theoretical and experimental investigation on modeling of surface topography influenced by the tool-workpiece vibration in the cutting direction and feeding direction in single-point diamond turning

The International Journal of Advanced Manufacturing Technology ◽

10.1007/s00170-016-8363-4 ◽

2016 ◽

Vol 86 (9-12) ◽

pp. 2433-2439 ◽

Cited By ~ 12

Author(s):

Fujing Tian ◽

Ziqiang Yin ◽

Shengyi Li

Keyword(s):

Experimental Investigation ◽

Surface Topography ◽

Single Point ◽

Diamond Turning ◽

Workpiece Vibration ◽

Cutting Direction

Download Full-text

A theoretical and experimental investigation of the tool-tip vibration and its influence upon surface generation in single-point diamond turning

International Journal of Machine Tools and Manufacture ◽

10.1016/j.ijmachtools.2009.12.003 ◽

2010 ◽

Vol 50 (3) ◽

pp. 241-252 ◽

Cited By ~ 71

Author(s):

H. Wang ◽

S. To ◽

C.Y. Chan ◽

C.F. Cheung ◽

W.B. Lee

Keyword(s):

Experimental Investigation ◽

Single Point ◽

Diamond Turning ◽

Surface Generation

Download Full-text

Forecasting of Surface Roughness and Cutting Force in Single Point Diamond Turning for KDP Crystal

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.339.78 ◽

2007 ◽

Vol 339 ◽

pp. 78-83 ◽

Cited By ~ 5

Author(s):

Jing He Wang ◽

Shen Dong ◽

H.X. Wang ◽

Ming Jun Chen ◽

Wen Jun Zong ◽

...

Keyword(s):

Surface Roughness ◽

Prediction Model ◽

Cutting Force ◽

Single Point ◽

Cutting Speed ◽

Cutting Parameters ◽

Diamond Turning ◽

Depth Of Cut ◽

Kdp Crystal ◽

Optimal Cutting Parameters

The method of single point diamond turning is used to machine KDP crystal. A regression analysis is adopted to construct a prediction model for surface roughness and cutting force, which realizes the purposes of pre-machining design, prediction and control of surface roughness and cutting force. The prediction model is utilized to analyze the influences of feed, cutting speed and depth of cut on the surface roughness and cutting force. And the optimal cutting parameters of KDP crystal on such condition are acquired by optimum design. The optimum estimated values of surface roughness and cutting force are 7.369nm and 0.15N, respectively .Using the optimal cutting parameters, the surface roughness Ra, 7.927nm, and cutting force, 0.19N, are obatained.

Download Full-text