Development of a hybrid coating process for deposition of diamond-like carbon films on microdrills

Ueng, Herng-Yih; Guo, C.T.; Dittrich, K.-H.

doi:10.1016/j.surfcoat.2005.01.122

Cited by 27 publications

(10 citation statements)

References 39 publications

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“…The critical load (L C ) value was 65 N in the a-C:H film adhesion measurements. In dry-sliding (pin-on disc) tests, a-C:H coatings were responsible for the very low wear of the coated surfaces [25]. The roughness was less than 4 nm, as revealed by atomic force microscopy (AFM), and the friction coefficient obtained was less than 0.15 (Fig.…”

Section: Characteristics Of Deposited A-c:h Filmsmentioning

confidence: 96%

Amorphous hydrogenated carbon coatings on IC packaging mold by ECR-CVD system

Guo

Chen

2007

Applied Surface Science

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Section: Characteristics Of Deposited A-c:h Filmsmentioning

confidence: 96%

Amorphous hydrogenated carbon coatings on IC packaging mold by ECR-CVD system

Guo

Chen

2007

Applied Surface Science

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“…Even though there are some disagreements regarding the pros and cons of using coating, many researchers and also industries are considering this as a promising technology in the future. Ueng et al [165,166] coated micro-drill, (e) 6000th coated (f) 10,000th coated [16].…”

Section: Coated Micro Drillsmentioning

confidence: 99%

A review of modern advancements in micro drilling techniques

Hasan

Zhao

Jiang

2017

Journal of Manufacturing Processes

164

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The demand for micro drilling with a diameter in a range of a few microns to several hundred microns is increasing in industries such as electronics, aerospace, medicine and automobiles, due to a significant uptake in the use of miniaturised products and devices. In order to satisfy the demand, a number of different micro drilling techniques have been developed. There has been, however, no report which explains, compares and contrasts all of these micro drilling techniques. This study examines the lasts micro drilling methods and techniques, categorises them into different groups, highlights recent developments and new trends, and depicts the future requirements in the field of micro drilling. Both conventional and non-conventional micro drilling techniques used in modern age applications are categorized. Conventional micro drilling makes use of drill bits of different configurations such as twist, spade, D-shaped, single flute, compound drill and coated micro drill, while non-conventional micro drilling involves electrical, chemical, mechanical and thermal means which include laser, EDM, ECM, SACE, electron beam, ultrasonic vibration or combinations of these approaches. We present here, a comparative study of conventional and non-conventional micro drilling techniques in order to show the potential and versatility of various micro drilling methods.

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“…Typically the drills fail due to gradual wear of cutting edge or too high cutting temperature. However, majority of the failure is due to excessive cutting force at the tip of the tool causing it to fail suddenly by brittle fracture (Ueng et al, 2006). This kind of failure is unpredictable and difficult to observe with unaided eye.…”

Section: Microdrill Life and Failure Modesmentioning

confidence: 99%

“…The cutting forces in microdrilling are very small and hence to identify the signals of cutting forces and torque is quite difficult due to poor signal to noise ratio. Also there is no simple correlation between tool wear and cutting forces (Ueng et al, 2006).…”

Section: Microdrill Life and Failure Modesmentioning

confidence: 99%

Microdrilling of Biocompatible Materials

Mohanty¹,

Wells²,

Hung

2012

Volume 3: Design, Materials and Manufacturing, Parts A, B, and C

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Product miniaturization trend is inevitable. The needs for minimum invasive surgery, smaller sensors for smart machinery, packing more features on a product… require mass production of smaller components from engineering materials. Fabrication of microcomponents requires knowledge of micromachining to avoid costly tool failure and part damage. This research investigates microdrilling of commercially pure titanium, nickel titanium (Nitinol), and 316L stainless steel. A surface was polished and drilled in rows of ten holes. Through hole drilling at 6:1 aspect ratio was performed on NiTi sheets while blind holes were drilled at 10:1 aspect ratio on Ti or 316L blocks. Microdrills with 100–150 μm diameter and 1.5–3.5 mm flute length were utilized up to 50,000 rpm in minimum quantity lubrication. Finite element models were developed to find upper limits of drilling parameters. Flank wear of 15μm on fine grained WC-Co uncoated tools and peeling of coating layer were used as tool life criteria. Scanning electron microscopy was used to observed tool failure mechanism. Tool life modeling and hole quality were performed to evaluate and compare tool performance. Although successfully drilling all materials at 10:1 aspect ratio, excessive built-up-edge (BUE) was found on microdrills at all drilling parameters. Such BUE effectively blunted the drill tips and caused drill wandering, degraded hole quality due to rubbing against the drilled wall, work-hardened the drilled surface and accelerated drill wear, and formed burrs at both entrance and exit ends. Wear of a microdrill at the outer corner was more pronounced when drilling CP titanium, but attrition wear at chisel edge was more significant for 316L stainless steel. The classical Taylor equation for macromachining was applicable in microdrilling to rank tool performance and machinability of tested materials. For the same cutting speed of 20 m/min and comparable drilling distance of about 35 mm, CP titanium can be microdrilled 400% faster than 316L stainless steel when applying 0.1 μm/flute chip load for the former and 0.02 μm/flute for the latter. The AlTiN coated drills improved tool life by at least 120%. This coating reduced BUE, drastically improved hole position accuracy by 115%, and decreased hole diameter variation from 0.110% to 0.003% for each mm of drilling distance.

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Development of a hybrid coating process for deposition of diamond-like carbon films on microdrills

Cited by 27 publications

References 39 publications

Amorphous hydrogenated carbon coatings on IC packaging mold by ECR-CVD system

Amorphous hydrogenated carbon coatings on IC packaging mold by ECR-CVD system

A review of modern advancements in micro drilling techniques

Microdrilling of Biocompatible Materials

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