Experimental Investigation of Bubble-Mixed Cutting Fluid Delivery for Micro Deep-Hole Drilling

2019 ◽  
Vol 7 (2) ◽  
Author(s):  
Chi-Ting Lee ◽  
Soham S. Mujumdar ◽  
Shiv G. Kapoor
Keyword(s):  
High Performance ◽  
Cutting Fluid ◽  
Hole Drilling ◽  
Drilling Process ◽  
Deep Hole ◽  
Delivery Method ◽  
Dry Cutting ◽  
Deep Hole Drilling ◽  
Fluid Delivery ◽  
Drilling Performance

In drilling, chip-clogging results in increased drilling temperature, excessive tool wear, and poor hole quality. Especially, in microdrilling, low rigidity of the tool and inability of cutting fluid to penetrate narrower tool–workpiece interface significantly reduce the drilling performance. A novel bubble-mixed cutting fluid delivery method proposed in this research aims toward achieving a high-performance micro deep-hole drilling process with a significant reduction in the consumption of cutting fluid. Experimental results show that the bubble-mixed cutting fluid delivery method achieves lower thrust force during drilling, higher drilled depth before tool breakage, and lower dimensional and circularity errors when machining deep holes in comparison with dry cutting or conventional flood delivery method. It is also found that the smaller-sized bubbles effectively penetrate the tool–workpiece interface during the drilling producing deeper holes by better chip evacuation and cooling.

Cutting Mechanism Study on Technology in Near-Dry Deep-Hole Drilling

2010 ◽  
Vol 455 ◽  
pp. 251-256
Author(s):  
Peng Hai ◽  
H.X. Wei
Keyword(s):  
Cutting Fluid ◽  
Hole Drilling ◽  
Deep Hole ◽  
Mechanism Study ◽  
Cutting Mechanism ◽  
Dry Cutting ◽  
Two Phase ◽  
Deep Hole Drilling ◽  
Mathematical Mode ◽  
Cooling And Lubrication

Near-dry deep hole processing technology is a kind of technology which dry cutting technology is applied to deep hole processing to save energy and decrease environmental pollution. In this paper, the structure and work principle of near-dry deep-hole drilling system were introduced and the cutting mechanism of near-dry deep-hole drilling was analyzed which include the mechanism of cutting fluid atomization and flow, the mechanism of atomized cutting fluid cool and lubricate, and the mechanism of separating chips into short pieces and discharge chips by air stream, etc. The mathematical mode of gas-liquid two-phase flow of atomized cutting fluid in drilling shaft and the cooling and lubrication mechanism of the capillary in cutting zone were introduced. It is found that near-dry deep hole processing has better cooling and lubrication effect through experiments.

Experiment and Analysis on Near-Dry Cutting System in Titanium Alloy Deep-Hole Drilling

2008 ◽  
Vol 392-394 ◽  
pp. 229-233
Author(s):  
H. Peng ◽  
Jiang Ping Wang ◽  
Ze Fu Bao
Keyword(s):  
Titanium Alloy ◽  
Cutting Fluid ◽  
Hole Drilling ◽  
Fluid Consumption ◽  
Deep Hole ◽  
Dry Cutting ◽  
Deep Hole Drilling ◽  
Cutter Wear ◽  
Drilling System ◽  
Cutting System

This paper depicts a boring and trepanning association (BTA) deep-hole drilling system with near-dry cutting technique. The cutting tests are carried out in view of the machining performances under the condition of applying the compressed air and atomized cutting fluid for drilling deep holes on titanium alloy which is difficult to cut. Several cutter materials have been utilized in the tests. The reasonable material of the deep-hole drilling cutter has been determined by analyzing the cutting force, the cutter wear and the surface finish. Environmental pollution decreases owing to little cutting fluid consumption in near-dry cutting system.

Whirling vibration of drilling shaft in minimal quantity lubrication deep hole drilling using theoretical and experimental investigation

2014 ◽  
Vol 229 (13) ◽  
pp. 2433-2442
Author(s):  
Lingfei Kong ◽  
Han Niu ◽  
Xiaoli Hou ◽  
Qingfeng Wang
Keyword(s):  
Surface Roughness ◽  
Rotational Speed ◽  
Cutting Fluid ◽  
Hole Drilling ◽  
Experimental Investigations ◽  
Drilling Process ◽  
Deep Hole ◽  
Deep Hole Drilling ◽  
Minimal Quantity Lubrication ◽  
Minimal Quantity

Under the concept of safety, improving efficiency, or reducing costs in deep hole drilling, the effect of minimal quantity lubrication (MQL) on the dynamic characteristics of drilling shaft is analyzed. A model is presented to describe the pressure function of MQL cutting fluid during drilling process. This model is based on the compressible Reynolds equation in air/oil feature with nonlinearity, and the differential transformation theory is introduced to solve the time-dependent pressure equation satisfied with MQL cutting fluid. Further, with an emphasis on model development, experiments are performed to validate the correctness and effectiveness of the above methods. A series of experimental investigations are carried out on the whirling characteristics of drilling shaft when the rotational speed and drilling depth are changed. Additionally, the vibration trajectories of drilling shaft and the surface roughness of hole are detected under different experimental conditions such as MQL drilling or traditional drilling. The results show that the whirling trajectory of drilling shaft decreases significantly in MQL deep hole drilling but the surface roughness of machined hole is worse due to surface scratches or scales. Nevertheless, there exists an optimal rotational speed of drilling shaft to improve machining precision of hole surface. These results indicate that the MQL method has shown potential to be even more productive as compared to traditional drilling and that the proposed method in this paper can lay a foundation for investigating the dynamic stability of drilling shaft in MQL drilling.

Experimental Research on the System Performance in Near-Dry Deep Hole Drilling

2010 ◽  
Vol 455 ◽  
pp. 98-102 ◽  
Author(s):  
H.B. Zhao ◽  
Y.F. Nan
Keyword(s):  
Surface Quality ◽  
System Performance ◽  
Cutting Fluid ◽  
Hole Drilling ◽  
Drilling Process ◽  
Deep Hole ◽  
Deep Hole Drilling ◽  
Ideal System ◽  
Drilling System ◽  
Chip Removal

The near-dry deep hole drilling system was taken as object in this study，and the contrast experiment between the deep hole drilling system and the traditional（wet）deep-hole drilling system，including the cutting force，the tool wear，the surface quality and the chip-break have been done. The results show that the near-dry system drill stability and have better effort in cooling，lubrication，chip removal effective. The tool life and surface quality within the hole are better，at the same time，it can greatly reducing the amount of cutting fluid，the costs and the pollution of the environment. So we can get a conclusion that it is an ideal system in green drilling process.

scholarly journals Temperature monitoring in the subsurface during single lip deep hole drilling

2020 ◽  
Vol 87 (12) ◽  
pp. 757-767
Author(s):  
Robert Wegert ◽  
Vinzenz Guski ◽  
Hans-Christian Möhring ◽  
Siegfried Schmauder
Keyword(s):  
Cutting Parameters ◽  
Drill Hole ◽  
Machining Process ◽  
Hole Drilling ◽  
Drilling Process ◽  
Deep Hole ◽  
Machining Processes ◽  
Deep Hole Drilling ◽  
Feed Force ◽  
Cutting Zone

AbstractThe surface quality and the subsurface properties such as hardness, residual stresses and grain size of a drill hole are dependent on the cutting parameters of the single lip deep hole drilling process and therefore on the thermomechanical as-is state in the cutting zone and in the contact zone between the guide pads and the drill hole surface. In this contribution, the main objectives are the in-process measurement of the thermal as-is state in the subsurface of a drilling hole by means of thermocouples as well as the feed force and drilling torque evaluation. FE simulation results to verify the investigations and to predict the thermomechanical conditions in the cutting zone are presented as well. The work is part of an interdisciplinary research project in the framework of the priority program “Surface Conditioning in Machining Processes” (SPP 2086) of the German Research Foundation (DFG).This contribution provides an overview of the effects of cutting parameters, cooling lubrication and including wear on the thermal conditions in the subsurface and mechanical loads during this machining process. At first, a test set up for the in-process temperature measurement will be presented with the execution as well as the analysis of the resulting temperature, feed force and drilling torque during drilling a 42CrMo4 steel. Furthermore, the results of process simulations and the validation of this applied FE approach with measured quantities are presented.

scholarly journals Cutting-fluid flow with chip evacuation during deep-hole drilling with twist drills

2021 ◽  
Author(s):  
Andreas Baumann ◽  
Ekrem Oezkaya ◽  
Dirk Schnabel ◽  
Dirk Biermann ◽  
Peter Eberhard
Keyword(s):  
Fluid Flow ◽  
Cutting Fluid ◽  
Hole Drilling ◽  
Deep Hole ◽  
Deep Hole Drilling ◽  
Twist Drills

Tiefbohren von thermoplastischen Kunststoffen*/Single-lip deep hole drilling of thermoplastics

2016 ◽  
Vol 106 (05) ◽  
pp. 336-340
Author(s):  
D. Prof. Biermann ◽  
M. Kirschner
Keyword(s):  
Process Optimization ◽  
High Performance ◽  
Hole Drilling ◽  
Manufacturing Processes ◽  
Metallic Materials ◽  
Deep Hole ◽  
Deep Hole Drilling

Hochleistungskunststoffe gewinnen stetig an industrieller Bedeutung und ersetzen in zahlreichen Anwendungen metallische Werkstoffe. Um dieser Entwicklung auch aus fertigungstechnischer Sicht gerecht zu werden, ist die parallele Optimierung von relevanten Fertigungsverfahren unumgänglich. Das Institut für spanende Fertigung ISF der Technischen Universität Dortmund nimmt sich aktuell einer dieser Herausforderungen an und beschäftigt sich mit der Prozessoptimierung des Einlippentiefbohrens thermoplastischer Kunststoffe.   High-performance plastics are steadily gaining ground in the industry, replacing metallic materials in numerous applications. To keep pace with this development in manufacturing, a synchronous optimization of relevant manufacturing processes is crucial. The Institute of Machining Technology currently deals with one of these challenges, focusing on the process optimization of single-lip deep hole drilling of thermoplastics.

scholarly journals Improved empirical wavelet denoising algorithm with application to whirling detection in deep hole drilling process

Procedia CIRP ◽  
2021 ◽  
Vol 104 ◽  
pp. 1924-1929
Author(s):  
Yue Si ◽  
Xuyang Li ◽  
Lingfei Kong ◽  
Jianming Zhen ◽  
Yan Li
Keyword(s):  
Wavelet Denoising ◽  
Hole Drilling ◽  
Drilling Process ◽  
Deep Hole ◽  
Deep Hole Drilling
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