Development of a High-Performance Deep-Hole Laser-Guided Boring Tool: Guiding Characteristics

Hochleistungskunststoffe gewinnen stetig an industrieller Bedeutung und ersetzen in zahlreichen Anwendungen metallische Werkstoffe. Um dieser Entwicklung auch aus fertigungstechnischer Sicht gerecht zu werden, ist die parallele Optimierung von relevanten Fertigungsverfahren unumgänglich. Das Institut für spanende Fertigung ISF der Technischen Universität Dortmund nimmt sich aktuell einer dieser Herausforderungen an und beschäftigt sich mit der Prozessoptimierung des Einlippentiefbohrens thermoplastischer Kunststoffe.   High-performance plastics are steadily gaining ground in the industry, replacing metallic materials in numerous applications. To keep pace with this development in manufacturing, a synchronous optimization of relevant manufacturing processes is crucial. The Institute of Machining Technology currently deals with one of these challenges, focusing on the process optimization of single-lip deep hole drilling of thermoplastics.

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Development and Design of Detachable Deep Hole Variable Diameter Boring Tool Device

Journal of Physics Conference Series ◽

10.1088/1742-6596/1653/1/012049 ◽

2020 ◽

Vol 1653 ◽

pp. 012049

Author(s):

Zhanfeng Liu ◽

Kun Wang ◽

Yazhou Feng ◽

Zhanhui Li

Keyword(s):

Deep Hole ◽

Variable Diameter ◽

Boring Tool

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On the Problem of Spiralling in BTA Deep-Hole Machining

Journal of Engineering for Industry ◽

10.1115/1.2901926 ◽

1994 ◽

Vol 116 (2) ◽

pp. 161-165 ◽

Cited By ~ 16

Author(s):

Y. B. Gessesse ◽

V. N. Latinovic ◽

M. O. M. Osman

Keyword(s):

Natural Frequency ◽

Experimental Approach ◽

Deep Hole ◽

Boring Bar ◽

Critical Speeds ◽

Standard Position ◽

Boring Tool ◽

Hole Machining

The phenomenon of spiralling or helical multi-lobe formation in holes, produced by the BTA (Boring and Trepanning Association) machining, is experimentally investigated for the solid boring tool. The causes leading to spiralling are deduced from this investigation. The experimental approach pursued in exploring the problem involved the running of the machine, at analytically predicted critical speeds and observing the reoccurrence of the phenomenon. It has been established that sprialling is caused by defectiveness of the tool (radial oversize of the circle-land with respect to the leading pad around the circumference) and the coincidence of the lateral natural frequency of the boring bar-tool asssembly, with five cycles per revoution of the tool, relative to the workpiece. It has also been established that spiralling occurs only in five lobes for the commercially available BTA-solid tool and is a consequence of the standard position of the circle-land, relative to the leading pad. The trials are repeated a number of times with various workpiece materials, to assert validity of the observations.

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Experimental Investigation of Bubble-Mixed Cutting Fluid Delivery for Micro Deep-Hole Drilling

Journal of Micro and Nano-Manufacturing ◽

10.1115/1.4043959 ◽

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.

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Experimental Study on Deep Hole Drilling Gamma Titanium Aluminide

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.455.293 ◽

2010 ◽

Vol 455 ◽

pp. 293-296 ◽

Cited By ~ 5

Author(s):

Lin Zhu ◽

Xin Chen ◽

Bernd Viehweger

Keyword(s):

Titanium Aluminide ◽

High Performance ◽

Cutting Temperature ◽

Tool Material ◽

High Strength ◽

Experimental Result ◽

Hole Drilling ◽

Deep Hole ◽

Gamma Titanium Aluminide ◽

Deep Hole Drilling

γ-titanium aluminide is a new intermetallic structural 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. But high strength, hardness and brittleness of the material also make processing difficultly. High cutting force and cutting temperature affecting a decline in cutting lifetime and cutting efficiency. 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 drills with appropriate tool material and geometric parameters. The experimental result shows: this drill bit is stable and efficient in drilling and can achieve a good quality.

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