A Study on Burr Formation and Controlling Technology in Precision or Ultra-Precision Drilling

2007 ◽  
Author(s):  
Yunming Zhu ◽  
Guicheng Wang ◽  
Pingkuan Zhang ◽  
Lijie Ma ◽  
Chunyan Zhang
Keyword(s):  
Metal Cutting ◽  
Burr Formation ◽  
Precision Machining ◽  
Machining Accuracy ◽  
New Approach ◽  
Cutting Test ◽  
Drilling Technology ◽  
Ultra Precision ◽  
Vibration Drilling ◽  
Exit Burr

Burr formation is a common phenomena in metal cutting. The burr not only effect precision of parts directly but influence the assembly quality badly. Therefore, the control and deburring technology of machining burrs has become one of the key problem in precision or ultra-precision and automatic procession. In traditional drilling, the exit burr is bigger than the entrance burr, and its hazard is more larger. Moreover deburring process is very complex. According to these status quo, a new method of active control of the exit burr is put forward using vibration drilling. Mechanism of chip broken and burr formation in vibration drilling are analysed systematically and an equipment of vibration drilling is developed based on drilling experiment. Cutting test on A3 material, brass (H62) and 1Cr18Ni9Ti stainless steel is carried out using the method of vibration drilling. As a result, cutting character is improved because of the using of this method. Also, machining accuracy and surface integrality of parts are improved remarkably and the size of the exit burr is controlled effectively in vibration drilling. The development of vibration drilling device provides a new approach for the progress of ultra-precision drilling technology. Vibration drilling device and technology developed in this study can be widely used to ultra-precision machining.

Active Control Methods of Cutting Burr in Precision and Ultra-Precision Machining

2014 ◽  
Vol 494-495 ◽  
pp. 620-623
Author(s):  
Juan Huang ◽  
Yun Ming Zhu ◽  
Qin Feng Li ◽  
Gui Cheng Wang
Keyword(s):  
Active Control ◽  
Formation Control ◽  
Metal Cutting ◽  
Burr Formation ◽  
Precision Machining ◽  
Tool Geometry ◽  
Control Methods ◽  
Processing Technologies ◽  
Technology System ◽  
Ultra Precision

The burr formation and control is one key technology of achieving precision and ultra-precision machining and automatic machining. Based on the theory of system engineering, the metal cutting burr formation, control and removal technology system are constructed in the paper. Then, the basic principles of burr control are presented. Combined with precision and ultra-precision machining and automatic machining, the active control methods and technologies of burr are presented. They are the modified design of parts structure, the option of tool geometry parameters, the adjustment of cutting data and processing technologies optimization etc. So, these methods lay a solid foundation on achieving minimum burrs.

Current Development and Countermeasure of Ultra-Precision Machine Tools

2010 ◽  
Vol 455 ◽  
pp. 632-636
Author(s):  
R.J. Song ◽  
J.L. Niu ◽  
Dong Hai Chen
Keyword(s):  
Machine Tools ◽  
Precision Machining ◽  
Machining Accuracy ◽  
Current Development ◽  
Factors Influencing ◽  
Precision Machine ◽  
Ultra Precision ◽  
Precision Machine Tools

Ultra-precision machine tools is an important machinery equipment to implement ultra-precision machining. Current development and the trend of the ultra-precision machine tools was analyzed. The factors influencing machining accuracy were pointed out from the viewpoint of system. Some suggestions were put forward on the domestic development and research of the ultra-precision machine tools.

Micro-Quality Control on Ultra-Precision Machining of Sapphire Substrates

2010 ◽  
Vol 102-104 ◽  
pp. 738-741
Author(s):  
Hai Zhou ◽  
Li Gang Bai ◽  
Dai Pin Wang
Keyword(s):  
Surface Roughness ◽  
Ph Value ◽  
Diamond Wheel ◽  
Precision Machining ◽  
New Approach ◽  
Sapphire Substrates ◽  
Ductile Mode ◽  
Ultra Precision ◽  
Main Factors

This paper proposed a new approach to control the micro-quality of sapphire substrate, in order to grow GaN on substrate. The main factors that influence macro-quality are the method of slicing, grinding and polishing. Thread speed of slicing is less than 0.5m/s. Ductile mode grinding of substrate is achieved by #3000 diamond wheel and feed of 1μm/r. The suitable polishing conditions are that the SiO2 grain size is less than 10nm, the concentration SiO2 is 3％, pH value of polishing liquid is 10.5 and polishing stress is 190Pa. The undamaged substrates have been obtained steadily. The surface roughness RMS is less than 0.4 nm.

scholarly journals Design and Manufacturing of a High-Sensitivity Cutting Force Sensor Based on AlSiCO Ceramic

Micromachines ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 63
Author(s):  
Taobo Gong ◽  
You Zhao ◽  
Yulong Zhao ◽  
Lukang Wang ◽  
Yu Yang ◽  
...  
Keyword(s):  
Cutting Force ◽  
High Speed ◽  
High Sensitivity ◽  
Force Sensor ◽  
High Price ◽  
Precision Machining ◽  
Force Sensors ◽  
Machining Accuracy ◽  
Status Monitoring ◽  
Ultra Precision

On-line cutting force measurement is an effective way to monitor processing quality, improve processing accuracy, and protect the tool. In high-speed and ultra-precision machining, status monitoring is particularly necessary to ensure machining accuracy. However, the cutting force is very small in high speed and ultra-precision machining. Therefore, high-sensitivity cutting force sensors are needed. Current commercial cutting force sensors have defects such as large volume, low compatibility, and high price. In particular, the sensitivity of cutting force sensor needs to be improved for high-speed and ultra-precision machining status monitoring. This paper provides a possible solution by embedding the sensor in the tool and selecting sensitive materials with high piezoresistive coefficient. In this paper, the structural design of the sensor and the fabrication of the sensitive material SiAlCO ceramic are carried out, and then the sensor is packaged and tested. The test results show that the cutting force sensor’s sensitivity was as high as 219.38 mV/N, which is a feasible way to improve cutting force sensor’s compatibility and sensitivity.

Fluctuation prediction of machining accuracy for multi-axis machine tool based on stochastic process theory

2014 ◽  
Vol 229 (14) ◽  
pp. 2534-2550 ◽  
Author(s):  
Qiang Cheng ◽  
Qiunan Feng ◽  
Zhifeng Liu ◽  
Peihua Gu ◽  
Ligang Cai
Keyword(s):  
Stochastic Process ◽  
Machine Tool ◽  
Significant Influence ◽  
Geometric Error ◽  
Error Modeling ◽  
Precision Machining ◽  
Machining Accuracy ◽  
Geometric Errors ◽  
Volumetric Error ◽  
Ultra Precision

Geometric error has significant influence on the processing results and reduces machining accuracy. Machine tool geometric errors can be interpreted as a deterministic value with an uncertain fluctuation of probabilistic distribution. Although, the uncertain fluctuation can not be compensated, it has extremely profound significance on the precision and ultra-precision machining to reduce the fluctuation range of machining accuracy as far as possible. In this paper, a typical 3-axis machine tool with high precision is selected and the fluctuations in machining accuracy are studied. The volumetric error modeling of machine tool is established by multi-body system (MBS) theory, which describes the topological structure of MBS in a simple and convenient matrix form. Based on the volumetric error model, the equivalent components of the errors for the three axes are established by reducing error terms. Then, the fluctuations of equivalent errors and the machining accuracy in working planes are depicted and predicted using the theory of stochastic process, whose range should be controlled within a certain confidence interval. Furthermore, the critical geometric errors that have significant influence on the machining accuracy fluctuation are identified. Based on the analysis results, some improvement in the machine tool parts introduced and the results for the modified machine show that the prediction allow for reduction in errors for the precision and ultra-precision machining.

Improvement Technology and Research Contents of Machining Accuracy for CNC Machine Tools

2013 ◽  
Vol 394 ◽  
pp. 195-200
Author(s):  
Xiao Peng Li ◽  
Hao Tian Yang ◽  
Ya Min Liang ◽  
Guang Hui Zhao ◽  
Xing Ju
Keyword(s):  
Error Compensation ◽  
Machine Tools ◽  
Rapid Development ◽  
Cnc Machine Tools ◽  
Precision Machining ◽  
Machining Accuracy ◽  
Cnc Machine ◽  
Error Prevention ◽  
New Era ◽  
Ultra Precision

To bring a new technological revolution, CNC technology and machines give the birth of a new era of control and production. The rapid development of CNC has considerably advanced the precision and ultra-precision machining technology to improve a new level and great attention. From error prevention and compensation, researches of the CNC machines precision at home and abroad were introduced. Key reasons for error compensation hardly use in the domestic widely were pointed out. Finally, the necessity and main contents of error compensation technology were presented according to the actual situation of enterprises.

Effects of Ultrasonic Vibration on Machining Accuracy in Drilling

2010 ◽  
Vol 102-104 ◽  
pp. 521-524
Author(s):  
Cheng Mao Zhang ◽  
De Yuan Zhang ◽  
Xiao Jie Ma
Keyword(s):  
Experimental Investigation ◽  
Stainless Steel ◽  
Ultrasonic Vibration ◽  
Promising Method ◽  
Small Hole ◽  
Burr Formation ◽  
Machining Accuracy ◽  
Location Accuracy ◽  
Vibration Drilling ◽  
Technological Constraints

Generally in the drilling of micro and small hole such as nozzle, problems frequently occur in terms of burr formation at the cutter exit, breakage of the drills and degradation of machining accuracy. A recent and promising method to overcome these technological constraints is the use of ultrasonic vibration drilling. This paper presents the design of an ultrasonically vibrated tool based on tailstock of lathe and the experimental investigation of ultrasonically assisted drilling of 3J1 stainless steel. The location accuracy of entering drilling and linear of drill were measured and compared. The obtained results show that the application of ultrasonic vibration can improve the machining accuracy considerably.

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