Effects of support misalignments in deep-hole drill shafts on hole straightness

Deng, Chyn-Shu; Huang, Jen-Chen; Chin, Jih-Hua

doi:10.1016/s0890-6955(01)00007-4

Cited by 31 publications

(20 citation statements)

References 10 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%

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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%

“…The impact of coaxially between the BTA drilling tool and the machined hole on the cutting forces fluctuation has been treated in [14,15]. In [13,16], the effect of the dynamic instability of the BTA drilling tool on the circularity of the hole has been studied.…”

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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“…Sakuma et al [4] considered the behavior of the BTA solid boring system and postulated that the forming of a multi-corner hole is a certain kind of self-excited vibration. Deng et al [5] used beam theory to investigate the hole straightness as affected by pilot bushing and intermediate support misalignments.…”

Section: Introductionmentioning

confidence: 99%

The Effects of Guide Pads on Bore Diameter Enlargement Magnitude in Deep Hole Drilling

Zhang

Shen

et al. 2016

MATEC Web Conf.

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Abstract. Deep hole machining accuracy plays a crucial role in product's quality. The results of an investigation into the machining accuracy of deep drilling holes which highlights problems of bore diameter enlargement magnitude assessment are presented in this paper. Through the study of BTA deep drilling tool properties and mechanism, as well as the formation rule of deep hole surface, clarified the burnishing mechanism of guide pad in deep hole drilling, and obtained the directly relationship between surface formation rule and the guide pad. After drilling experimentrevealed the effect of guide pad on bore diameter enlargement magnitude.

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“…Chin et al [6,7] presented the problem of state monitoring in deep-hole drilling by computer simulation and experiment. Perng and Deng [8,9] established the different models for lateral and longitudinal shaft motion to study the tool eigenproperties of deep-hole drilling, such as numerical EulerBernoulli beam model, dynamic flexibility rotating beam model, and flexibility rotating beam mode with static fluid. Such simplified models do not accurately represent the practical drilling shaft system.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigating nonlinear dynamic responses to rotating deep-hole drilling shaft with multi-span intermediate supports

Kong

Zhao

2013

International Journal of Non-Linear Mechanics

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Effects of support misalignments in deep-hole drill shafts on hole straightness

Cited by 31 publications

References 10 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

The Effects of Guide Pads on Bore Diameter Enlargement Magnitude in Deep Hole Drilling

Numerical investigating nonlinear dynamic responses to rotating deep-hole drilling shaft with multi-span intermediate supports

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