Experimental investigations on single-lip deep hole drilling of superalloy Inconel 718 with small diameters

2015 ◽  
Vol 20 ◽  
pp. 332-339 ◽  
Author(s):  
Dirk Biermann ◽  
Marko Kirschner
Keyword(s):  
Inconel 718 ◽  
Hole Drilling ◽  
Experimental Investigations ◽  
Deep Hole ◽  
Deep Hole Drilling

scholarly journals Influence of Burnishing Axial Interference on Hole Surface Quality in Deep Hole Drilling of Inconel 718

2016 ◽  
Vol 5 ◽  
pp. 1295-1307 ◽  
Author(s):  
S. Malarvizhi ◽  
Akshay Chaudhari ◽  
Keng Soon Woon ◽  
A. Senthil Kumar ◽  
Mustafizur Rahman
Keyword(s):  
Surface Quality ◽  
Inconel 718 ◽  
Hole Drilling ◽  
Deep Hole ◽  
Deep Hole Drilling

scholarly journals IN-PROCESS MEASUREMENT AND NUMERICAL DETERMINATION OF THE TEMPERATURE IN THE CONTACT ZONE DURING SINGLE LIP DEEP HOLE DRILLING

2021 ◽  
Vol 2021 (3) ◽  
pp. 4556-4562
Author(s):  
R. Wegert ◽  
◽  
V. Guski ◽  
H. - C. Moehring ◽  
S. Schmauder ◽  
...  
Keyword(s):  
Temperature Measurement ◽  
Contact Zone ◽  
Hole Drilling ◽  
Experimental Investigations ◽  
Deep Hole ◽  
Machining Processes ◽  
German Research Foundation ◽  
Deep Hole Drilling ◽  
Process Measurement ◽  
Feed Force

In this presented work, the main objective is the in-process measurement of the thermal as-is state near the drilling contact zone by means of a sensor-integrated tool for single lip deep hole drilling (SLD). Additionally, the mechanical quantities feed force and drilling torque are evaluated. The process monitoring is essential to optimize the surface quality as well as the subsurface properties such as hardness and residual stresses. These quantities are strongly dependent on the thermo-mechanical as-is state in the cutting zone and in the contact zone between the guide pads and the drill hole surface. This contribution gives a project overview including the development of a sensor-integrated single lip deep hole driller for the in-process temperature measurement, the integration of sensor systems in the tool as well as the experimental investigations on the temperature, the feed force and the drilling torque during drilling of a 42CrMo4 steel. The temperature measurement at eleven positions in the driller head provides data to observe the heat generation, distribution, and flow independently from the workpiece characteristics. However, one of the greatest benefits is the non-destructive fashion of the measurement system with their sensor integrated in the tool and thus the reusability. A simulation method, which uses the experimental results as a reference, is used to predict the thermo-mechanical conditions in the contact zone of the drill head and the workpiece. The results of these thermo-mechanical process simulations and the validation of this applied FE approach using the measured quantities are presented, too. The results of this work are 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).

Optimization of laser deep-hole drilling of Inconel 718 using the Taguchi method

1993 ◽  
Vol 37 (1-4) ◽  
pp. 741-757 ◽  
Author(s):  
S.C. Tam ◽  
C.Y. Yeo ◽  
S. Jana ◽  
Michael W.S. Lau ◽  
Lennie E.N. Lim ◽  
...  
Keyword(s):  
Taguchi Method ◽  
Inconel 718 ◽  
Hole Drilling ◽  
Deep Hole ◽  
Deep Hole 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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