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.

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.

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.

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

The Study of Deep-Hole Drilling BTA Drill Whirl Caused by Cutting Fluid

2015 ◽  
Vol 752-753 ◽  
pp. 466-472
Author(s):  
Zhen Ya Chen ◽  
Zhen Dong ◽  
Xiao Bin Huang ◽  
Yan Lan Li
Keyword(s):  
Reynolds Equation ◽  
Cutting Fluid ◽  
Squeeze Film ◽  
Hole Drilling ◽  
Deep Hole ◽  
Fluid Force ◽  
Deep Hole Drilling ◽  
Squeeze Film Damper ◽  
Before And After ◽  
Squeeze Effect

The relationships between drill speed, whirl, squeeze effect and fluid force drill suffered is got by using cutting fluid Reynolds equation. Principle of deep-hole drilling drill whirl is studied, pointing out the promotion of positive precession cutting fluid component is drill whirl’s reason. Simulated and studied of drill whirl round shape at different times, suggesting that only when BTA drill suffered by the fluid force, stable motion can be obtained. Analysis of the anti-precession of drill, and the squeeze film damper work principle is revealed. Comparative studied the movement of the drill by using MATLAB software simulation before and after adding squeeze film damper.

MQL Technology Including the BTA Deep Hole Drilling Machining

2011 ◽  
Vol 189-193 ◽  
pp. 3071-3074
Author(s):  
Hai Peng ◽  
Tong Li
Keyword(s):  
Processing System ◽  
Water Soluble ◽  
Production Costs ◽  
Cutting Fluid ◽  
Hole Drilling ◽  
Deep Hole ◽  
Deep Hole Drilling ◽  
Mixed Use ◽  
High Production ◽  
Hole Machining

The traditional cast-type method of BTA deep-hole drilling(such as BTA or DF) has cutting fluid consumption of the existence of large, high production costs, pollution of the environment and endangering the health of the operator and other problems. In this paper, the MQL technology (minimum lubrication technology) is applied to the method of BTA deep-hole machining (ie, near-dry deep-hole processing), we also analyzed the function and effect of MQL machining cutting fluid. Through the near-dry deep-hole drilling experiment, we find that a water-soluble cutting fluid has good atomization effect and the processing system also has fine effect of cooling and chip evacuation. We proposed mixed-use oil and the low-temperature cold spray methods to improve the tool lubrication and cooling effect for some great issues such as tool wear.

Experiments and Analysis of Near-Dry Deep-Hole Drilling System

2010 ◽  
Vol 455 ◽  
pp. 355-359
Author(s):  
Peng Hai ◽  
F. Yuan
Keyword(s):  
Design Method ◽  
Processing System ◽  
Cutting Parameters ◽  
Hole Drilling ◽  
Deep Hole ◽  
Dry Cutting ◽  
Deep Hole Drilling ◽  
Drilling System ◽  
Better Than

Based on the characteristics of near-dry cutting and BTA deep-hole drilling, this paper presented design method of near-dry deep-hole processing system, and then studied on it through experiments. The results show that the near-dry deep-hole processing system has better effects on discharge chips and coolant. At the same time, near-dry cutting function was better than BTA cutting with appropriate cutting parameters through comparing with BTA cutting machining.

Preliminary Study on Deep-Hole Drilling Gamma Titanium Aluminide

2010 ◽  
Vol 139-141 ◽  
pp. 831-834 ◽  
Author(s):  
Lin Zhu ◽  
Xin Chen ◽  
Bernd Viehweger
Keyword(s):  
Automobile Industry ◽  
Titanium Aluminide ◽  
Tool Material ◽  
Cutting Fluid ◽  
Experimental Result ◽  
Hole Drilling ◽  
Deep Hole ◽  
Gamma Titanium Aluminide ◽  
External Edge ◽  
Deep Hole Drilling

γ-titanium aluminide are considered as a potential light weight material. γ-titanium aluminide alloy has the advantages of high temperature resistance, high performance of anti-oxidation effect, low-density, high specific strength and rigidity etc. This material is suitable to be applied in aeronautics, astronautics and automobile industry. But high hardness, brittleness and mechanical strength make it hard to process. This problem is more acute in deep hole drilling. In this paper, we have analyzed the cutting performance of γ- titanium aluminide and designed a deep-hole drill with three different tool materials. The experimental result shows: (1) YG8 cemented carbide is the appropriate tool material for drilling γ-titanium aluminide. (2) Small rake angle of external edge (γo=-1°) and big clearance angle of external edge (αo=10~12°) should be chosen. (3) Best wear results are obtained when oil is utilized as cutting fluid.

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.

scholarly journals Experimental and simulative investigation of the oil distribution during a deep-hole drilling process and comparing of the RANS kω-SST and RANS hybrid SAS-SST turbulence model

2018 ◽  
Vol 1 (4) ◽  
Author(s):  
Ekrem Oezkaya
Keyword(s):  
Cfd Simulation ◽  
Fluid Dynamic ◽  
Hole Drilling ◽  
Experimental Investigations ◽  
Drilling Process ◽  
Deep Hole ◽  
Deep Drilling ◽  
Deep Hole Drilling ◽  
Sst Model ◽  
Cooling And Lubrication

Helical deep hole drilling is a process frequently used in industrial applications to produce bores with a large length to diameter ratio. For better cooling and lubrication, the deep drilling oil is fed directly into the bore hole via two internal cooling channels. Due to the inaccessibility of the cutting area, experimental investigations that provide information on the actual machining and cooling behavior are difficult to carry out. In this paper, the distribution of the deep drilling oil is investigated both experimentally and simulatively and the results are evaluated. For the Computational Fluid Dynamics (CFD) simulation, two different turbulence models, i.e. the RANS k-ω-SST and hybrid SAS-SST model, are used and compared. Thereby, the actual used deep drilling oil is modelled instead of using fluid dynamic parameters of water, as is often the case. With the hybrid SAS-SST model, the flow could be analyzed much better than with the RANS k-ω-SST model and thus the processes that take place during helical deep drilling could be  simulated with realistic details. Both the experimental and the simulative results show that the deep drilling oil movement is almost exclusively generated by the tool rotation. At the tool’s cutting edges and in the flute, the flow velocity drops to zero for the most part, so that no efficient cooling and lubrication could take place there. In addition, cavitation bubbles form and implode, concluding in the assumption that the process heat is not adequately dissipated and the removal of chips is adversely affected, which in turn can affect the service life of the tool and the bore quality. The carried out investigations show that the application of CFD simulation is an important research instrument in machining technology and that there is still great potential in the area of tool and process optimization.

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