Simulation of the BTA deep-hole drilling process

Biermann, Dirk; Sacharow, Alexei; Wohlgemuth, Klaus

doi:10.1007/s11740-009-0176-y

Cited by 21 publications

(7 citation statements)

References 6 publications

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“…In deep hole drilling the combination of chip removal, lubrication and localization of the thermomechanical loading in a confined cutting zone has a direct impact on the tool life and machining performances [2]. The main treated problems in scientific works concern the role of guide pads [1,[3][4][5][6][7][8][9][10][11][12][13], the dynamic phenomena occurring during the machining [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24] and the chip formation process [25,29].…”

Section: Introductionmentioning

confidence: 99%

“…The chatter effect is a frequent vibration phenomenon in deep hole drilling [17][18][19][20][21][22]. It corresponds to the auto-excitation vibrations in torsion motion, and conducts generally to tool wear acceleration as well as to a bad surface finish at the end of blind holes [23]. The spiral effect is another type of dynamic perturbations, described by many authors [19][20][21][22]24].…”

Section: Introductionmentioning

confidence: 99%

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Experimental and analytical analyses of the cutting process in the deep hole drilling with BTA (Boring Trepanning Association) system

Thil

Haddag

Nouari

et al. 2013

Mechanics & Industry

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-This paper deals with analysis of the cutting process, on a macro and micro scale, in the deep hole drilling with BTA system. An experimental procedure is developed to highlight the impact of cutting speed and feed rate on the cutting process when machining the 18MND5 steel. Parameters based on dimensional characteristics of chips are introduced to quantify the morphology of chips generated by central, intermediate and external inserts of the complex BTA drilling tool. From observation of the chips morphology (flat, curved and spiral) and the measurement of the chips width, the provenance of each chip with respect to cutting inserts is identified. Then, the Chip Compression Ratio is evaluated for each cutting condition, indicating the amount of plastic strain in chips. Thanks to the introduction of a new parameter, denoted as Chip Fragmentation Ratio, it is found that the cutting speed has a little influence, compared to the feed rate, on the chips size. Based on this quantitative analysis, the optimal range of cutting conditions for the BTA deep hole drilling is discussed. It is mentioned that although increasing the feed rate promotes the chips fragmentation and increases the material removal rate (increasing productivity), an upper limit is to determine to prevent excessive flank wear. Also, the cutting speed should be limited to avoid excessive crater wear.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental and analytical analyses of the cutting process in the deep hole drilling with BTA (Boring Trepanning Association) system

Thil

Haddag

Nouari

et al. 2013

Mechanics & Industry

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“…Figure 1 or Figure 2 is the existing BTA drilling system, its machining principle has existed for more than 200 years (Botek™, USA, Inc. Home, 2020; Coromant, 2021; Haldon, 1967; Biermann et al , 2009).…”

Section: Structure and Function Of Centering Devicementioning

confidence: 99%

Centering deep hole drilling system with three oil films like centering rotating journal with oil films in bearing

Ming

2021

ILT

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Purpose This study and its centering device with Archimedes spirals designed on hydrodynamic lubrication aims to reduce the deviation of deep holes because the drill tube is long and easy to deviate in deep hole machining. Design/methodology/approach The centering device with Archimedes spirals was designed and fixed between the drilling tool and the drill tube. The wall of the deep hole and the novel centering device formed three wedge-shaped oil films. When the workpiece rotated relative to the centering device, pressure was generated in the oil films; therefore, three oil films supported drilling system as oil films support rotating journal in the full-film hydrodynamic bearing. Findings When the Boring and Trepanning Association (BTA) drilling system was equipped with the centering device, the cutting oil flowed smoothly and carried all the iron chips; the motors run normally; no additional vibration or sound was detected during processing; the surface of the centering device was smooth; and the deviation of the drilled deep hole decreased with a high probability. Originality/value To the best of the authors’ knowledge, no one has designed and made the centering device with Archimedes spirals to reduce the deviation of deep holes in deep hole machining. Three oil films formed by the centering device with Archimedes spirals support drilling system and prevent it from deviating, which has never appeared before and is creative.

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“…Kong and colleagues 9–11 analyzed the dynamic behavior of the drilling shank. Biermann et al 12 produced a cutting simulation. Al-Wedyan and Hayajneh 13 studied the property of machining dynamics.…”

Section: Introductionmentioning

confidence: 99%

Guidance principle of deep-hole cutting tools based on fluid wedge effect

Zhang

2017

Proceedings of the Institution of Mechanical Engineers, Part B:

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The existing guidance principle of deep-hole cutting tools has been used for more than 200 years. A novel guidance principle of deep-hole cutting tools is proposed based on the fluid wedge effect. The novel guidance principle stems from hydrodynamic lubrication in journal bearings and can prevent deep-hole cutting tool deviation during machining. A novel wedge-shaped body is fixed to the drill tip and the shank. The wedge-shaped body and the wall of the deep hole form four wedge-shaped spaces, and the cutting oil is drawn into the four wedge-shaped spaces to form four wedge-shaped oil films. Pressure develops in the oil film, and the forces of the oil films force the wedge-shaped body together with the drill tip and the shank to be centered in the deep hole and to move along the axis of the deep hole. The resultant force of the oil films tends to rectify the deviation of the cutting tool, and the resultant force equals 228 N in one example. Analysis and calculation of the forces of the wedge-shaped oil films were conducted, and the force of each oil film was 128 N in another example. Experiments showed that the average straightness of the deep holes machined by the novel deep-hole cutting tools was less than that achieved using the existing cutting tool. The parameters of the wedge-shaped body influenced the force of the oil film and the straightness of the deep holes.

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Simulation of the BTA deep-hole drilling process

Cited by 21 publications

References 6 publications

Experimental and analytical analyses of the cutting process in the deep hole drilling with BTA (Boring Trepanning Association) system

Experimental and analytical analyses of the cutting process in the deep hole drilling with BTA (Boring Trepanning Association) system

Centering deep hole drilling system with three oil films like centering rotating journal with oil films in bearing

Guidance principle of deep-hole cutting tools based on fluid wedge effect

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