Mikrotiefbohren mit Laserpilotbohrungen*/Micro drilling with laser pilot holes - Laser pre-drilling as guidance for deep hole drilling in demanding surface geometries

2018 ◽  
Vol 108 (01-02) ◽  
pp. 76-80
Author(s):  
S. Michel ◽  
D. Prof. Biermann
Keyword(s):  
Hole Drilling ◽  
Drilling Process ◽  
Deep Hole ◽  
Process Chain ◽  
Deep Hole Drilling ◽  
Pilot Hole ◽  
Multi Stage ◽  
Micro Drilling ◽  
Drilling Unit ◽  
Stage Process

Tiefbohrungen erfordern bei anspruchsvollen Anbohrsituationen speziell angepasste Bohrbuchsen oder eine mehrstufige Prozesskette aus Planfräsen, Pilotbohren und Tiefbohren. Mit einem hybriden Maschinenkonzept, bestehend aus einem Laser und einer konventionellen Tiefbohreinheit, lässt sich die Prozesskette deutlich verkürzen. Im Rahmen dieses Artikels wird der Laserpilotbohrprozess für den Edelstahl 1.4404 untersucht und die Verfahrenskombination bei mehreren Anbohrsituationen umgesetzt.   Deep hole drilling requires special drill bushes or a multi-stage process chain of face milling, pilot hole drilling and deep hole drilling for demanding surface geometries. With a hybrid machine concept, consisting of a laser and a conventional deep hole drilling unit, the process chain can be significantly shortened. Within the scope of this article, the laser pilot hole drilling process for AISI 316L is investigated and the process combination for several surface geometries is implemented.

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 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

The thermal modeling of deep-hole drilling process under MQL condition

2017 ◽  
Vol 29 ◽  
pp. 194-203 ◽  
Author(s):  
A.T. Kuzu ◽  
K. Rahimzadeh Berenji ◽  
B.C. Ekim ◽  
M. Bakkal
Keyword(s):  
Thermal Modeling ◽  
Hole Drilling ◽  
Drilling Process ◽  
Deep Hole ◽  
Deep Hole Drilling

A Study on the Characteristics of Micro Deep Hole Machining Processes

2007 ◽  
Vol 364-366 ◽  
pp. 566-571
Author(s):  
Tae Il Seo ◽  
Dong Woo Kim ◽  
Myeong Woo Cho ◽  
Eung Sug Lee
Keyword(s):  
Aspect Ratio ◽  
High Aspect Ratio ◽  
High Speed ◽  
Printed Circuit Boards ◽  
Hole Drilling ◽  
Deep Hole ◽  
Machining Processes ◽  
Deep Hole Drilling ◽  
Micro Drilling ◽  
Hole Machining

Recently, the trends of industrial products move towards more miniaturization, variety and mass production. Micro drilling which take high precision in cutting work is required to perform more micro hole and high speed working. Especially, Micro deep hole drilling is becoming more important in a wide spectrum of precision production industries, ranging from the production of automotive fuel injection nozzle, watch and camera parts, medical needles, and thick multilayered Printed Circuit Boards(PCB) that are demanded for very high density electric circuitry. The industries of precision production require smaller holes, high aspect ratio and high speed working for micro deep hole drilling. However the undesirable characteristics of micro drilling is the small signal to noise ratios, wandering motion of drill, high aspect ratio and the increase of cutting force as cutting depth increases. In order to optimize cutting conditions, an experimental study on the characteristics of micro deep hole machining processes using a tool dynamometer was carried out. And additionally, microscope with built-in an inspection monitor showed the relationship between burr in workpieces and chip form of micro drill machining.

scholarly journals 501 A Countermeasure Against a Rifling Mark Generating Phenomenon on BTA Deep Hole Drilling Process : Experimental Study

2011 ◽  
Vol 2011 (0) ◽  
pp. _501-1_-_501-7_
Author(s):  
Shotaro NAKAO ◽  
Kenichiro MATSUZAKI ◽  
Takahiro RYU ◽  
Atsuo SUEOKA ◽  
Kazuhisa OMURA
Keyword(s):  
Experimental Study ◽  
Hole Drilling ◽  
Drilling Process ◽  
Deep Hole ◽  
Deep Hole Drilling

1E2 Experimental Study on the Mechanism of Rifling Mark Generation in BTA Deep Hole Drilling Process

2014 ◽  
Vol 2014 (0) ◽  
pp. _1E2-1_-_1E2-2_
Author(s):  
Keita HIRASE ◽  
Takahiro RYU ◽  
Kenichiro MATSUZAKI ◽  
Keizo TSUKAMOTO ◽  
Katsushi FUJII ◽  
...  
Keyword(s):  
Experimental Study ◽  
Hole Drilling ◽  
Drilling Process ◽  
Deep Hole ◽  
Deep Hole Drilling
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