Drilling with Twist Drills of Different Cross Section Profiles

Spur, G.; Masuha, J.R.

doi:10.1016/s0007-8506(07)60890-7

Cited by 17 publications

(4 citation statements)

References 3 publications

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“…For example, it has been reported that in deep-hole drilling with carbon steel, more pronounced fluctuations in forces were observed with increasing hole depth due to severe chip jamming [39]. Notably, as shown in zone C on Fig.…”

Section: Resultsmentioning

confidence: 85%

An Experimental Investigation of Forces on Cortical Bone in Deep-Hole Bone Drilling

Lee

Chu

2020

Journal of Engineering and Science in Medical Diagnostics and Therapy

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Deep-hole bone drilling is critical in many surgical implantation procedures. Unlike most common bone-drilling processes, deep-hole bone drilling is performed using a high drilling depth to drill-bit diameter ratio, which can lead to undesirable mechanical and thermal damage during surgical procedures. The objective of this study was to investigate the thrust force and torque generated in deep-hole bone drilling. Drilling tests were performed on bovine cortical bones at a drilling hole depth of 36 mm using a 2.5 mm diameter twist drill bit with a spindle speed of 3000 rpm and feed rates of 0.05, 0.075, and 0.1 mm/rev. Bone chips were collected at different depths and examined using a fiber-optic microscope. Not only are drilling forces a good indicator to assess drilling performances but also chip formation and morphology are important aspects for understanding bone-drilling behaviors. The force signals revealed two distinct states, which were referred to as normal and abnormal states in this study. In the normal state, the force signals remained constant once the drill tip became fully engaged in bone cutting, whereas after a certain drilling depth, the forces considerably increased in the abnormal state. The results of this study indicate that the rapid increase in the force in the abnormal state is mainly attributed to chip clogging inside the flutes as the drilling depth increases. This study also demonstrated that the chip morphology varies with respect to drilling depth, where fragmented chips are produced at shallow drilling depths and powdery chips are produced at deeper drilling depths.

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Section: Resultsmentioning

confidence: 85%

An Experimental Investigation of Forces on Cortical Bone in Deep-Hole Bone Drilling

Lee

Chu

2020

Journal of Engineering and Science in Medical Diagnostics and Therapy

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“…By considering Prandtl's analogy, De Beer in [19] pointed out the importance of the web thickness and mentions that a reduction in web thickness reduces the stiffness of a drill. According to Spur et al [20], the distribution of the cross-section area affects the torsional stiffness via its effect on the polar second moment of the area (I p ). Therefore, if the area is concentrated at the center, I p and consequently, the torsional stiffness is reduced [20].…”

Section: Introductionmentioning

confidence: 99%

“…According to Spur et al [20], the distribution of the cross-section area affects the torsional stiffness via its effect on the polar second moment of the area (I p ). Therefore, if the area is concentrated at the center, I p and consequently, the torsional stiffness is reduced [20]. From this, it was concluded that it is beneficial to place the coolant channel at the center of the drill to decrease the reduction of I p and hence the torsional stiffness.…”

Section: Introductionmentioning

confidence: 99%

Minimizing the Negative Effects of Coolant Channels on the Torsional and Torsional-Axial Stiffness of Drills

Parsian

Eynian

Magnevall

et al. 2021

Metals

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Coolant channels allow internal coolant delivery to the cutting region and significantly improve drilling, but these channels also reduce the torsional and torsional-axial stiffness of the drills. Such a reduction in stiffness can degrade the quality of the drilled holes. The evacuation of cutting chips and the delivery of the cutting fluid put strict geometrical restrictions on the cross-section design of the drill. This necessitates careful selection and optimization of features such as the geometry of the coolant channels. This paper presents a new method that uses Prandtl’s stress function to predict the torsional and torsional-axial stiffness values. Using this method drills with one central channel are compared to those with two eccentric coolant channels, which shows that with the same cross-section area, the reduction of axial and torsional-axial stiffness is notably smaller for the design with two eccentric channels compared to a single central channel. The stress function method is further used to select the appropriate location of the eccentric coolant channels to minimize the loss of torsional and torsional-axial stiffness. These results are verified by comparison to the results of three-dimensional finite element analyses.

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“…Το αποτέλεσμα της παραπάνω διαδικασίας ήταν η δημιουργία μιας βελτιστοποιημένης στερεής γεωμετρίας. Οι Spur και Masuha [40] πειραματίστηκαν με διάφορες διατομές εργαλείων και μελέτησαν την επίδρασή τους στις δυνάμεις κοπής, τη ροπή αλλά και τα δυναμικά χαρακτηριστικά του τρυπανιού. Ο Vijayaraghavan [41] χρησιμοποίησε τη δυνατότητα προγραμματισμού του Solidworks TM και ανέπτυξε ένα λογισμικό αυτόματης σχεδίασης κοινών τρυπανιών βασισμένος στη μεθοδολογία του Galloway.…”

Section: στάθμη γνώσεων |unclassified

Προσομοίωση Της Κατεργασίας Της Διάτρησης Με Πεπερασμένα Στοιχεία Λαμβάνοντας Υπόψη Τα Δυναμικά Φαινόμενα Και Βελτιστοποίηση Των Συνθηκών Κοπής

Belis¹

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Σύντομο βιογραφικό σημείωμαΟ Ταξιάρχης Μπελής γεννήθηκε στην Αθήνα το 1985. Το εισήχθη στο Τμήμα Μηχανικών Παραγωγής και Διοίκησης του Πολυτεχνείου Κρήτης από όπου και αποφοίτησε το 2008. Εν συνεχεία εισήχθη στο Μεταπτυχιακό Πρόγραμμα Ειδίκευσης του τομέα Συστημάτων Παραγωγής του ίδιου τμήματος, ενώ από τον Ιούνιο του 2010 είναι υποψήφιος διδάκτωρ στο εργαστήριο Μικροκοπής και Κατασκευαστικής Προσομοίωσης.Από το 2009 έως σήμερα εργάστηκε ως εργαστηριακός συνεργάτης των μαθημάτων «Στοιχεία Μηχανών», «Μετρολογία» και «Κατασκευαστικές Τεχνολογίες σε Μικροκλίμακα». Από το 2009 έως σήμερα έχει εργαστεί με συμβάσεις έργου σε εθνικά ερευνητικά προγράμματα όπως: «Προσδιορισμός φθοράς σε κατεργασίες οδοντώσεων με φραιζάρισμα με κύλιση» και «Ανάπτυξη νέων προϊόντων και αντιγράφων πολιτιστικής κληρονομιάς με χρήση ψηφιοποίησης και τεχνολογιών παραγωγής σε μικροκλίμακα».

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Drilling with Twist Drills of Different Cross Section Profiles

Cited by 17 publications

References 3 publications

An Experimental Investigation of Forces on Cortical Bone in Deep-Hole Bone Drilling

An Experimental Investigation of Forces on Cortical Bone in Deep-Hole Bone Drilling

Minimizing the Negative Effects of Coolant Channels on the Torsional and Torsional-Axial Stiffness of Drills

Προσομοίωση Της Κατεργασίας Της Διάτρησης Με Πεπερασμένα Στοιχεία Λαμβάνοντας Υπόψη Τα Δυναμικά Φαινόμενα Και Βελτιστοποίηση Των Συνθηκών Κοπής

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