Conical flank twist drill points

Fugelso, M.A.

doi:10.1016/0890-6955(90)90137-8

Cited by 10 publications

(4 citation statements)

References 6 publications

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“…Armarego and Cheng [1] analyzed only the cylindrical flank configuration which resulted in the tool clearance angle being constant from the chisel edge to the outer edge, though it is required that the clearance angle should be greater near chisel edge. Fugelso [6][7] tried to solve this problem in cylindrical grinding by rotating the drill about its own axis with a slight penalty of having a slightly curved edge near the chisel edge. This altered the relationship between the clearance angle and the radius.…”

Section: 1mentioning

confidence: 99%

“…Theyalso obtained curved (convex or concave) cutting lip shapes for different semi-point angles using helical grinding. Galloway [11] and Fugelso [6,7] have also stressed that curved cutting lip shapes result in a longer drill life than a straight lip for various working conditions and working materials. Shi et al [16] conducted a study on curved edge drills and optimized the cutting edge shape to realize a desired rake angle distribution.…”

Section: 1mentioning

confidence: 99%

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CAD Based Mechanistic Modeling of Forces for Generic Drill Point Geometry

Sambhav¹,

Dhande²,

Tandon³

2010

Computer-Aided Design and Applications

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The paper presents a methodology to model the geometry and forces of twist drills with generic point geometry. Starting from a detailed computer-aided designed (CAD) geometric model for a fluted twist drill in terms of bi-parametric surface patches using NURBS to present a generic model for the cutting lip and chisel edge, mechanistic model has been used to predict the forces. Optimization technique has been employed to obtain the points of intersection of surface patches. Using mechanistic model for normal and friction forces for the oblique cutting elements on the cutting lips and the chisel edge, the force components have been calculated, resolved and integrated to give the total thrust and torque for the generic profile of the drill.

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Section: 1mentioning

confidence: 99%

Section: 1mentioning

confidence: 99%

CAD Based Mechanistic Modeling of Forces for Generic Drill Point Geometry

Sambhav¹,

Dhande²,

Tandon³

2010

Computer-Aided Design and Applications

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“…In Tsai and Wu (1979) proposed a comprehensive mathematical model to characterize the twist drill point geometry for conical, hyperboloidal and ellipsoidal configurations (Tsai and Wu, 1979). Fugelso (1990) found that current mathematical models required the cutting edge to be straight in 3D spaces, which lead the clearance angle to undesirably small values near the chisel edge. The clearance angle near the chisel edge could be increased at the small penalty of having a slightly curved cutting edge, by rotating the drill 5-108 about its axis before sharpening.…”

Section: High Aspect Ratio Drill Bitsmentioning

confidence: 99%

Challenges and developments of micro drill bit for printed circuit board: a review

Shi

2013

Circuit World

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Purpose -The purpose of this paper is to present a clear picture of the challenges of micro drill bit and the developments of novel micro-drill bits for flexible circuit boards, environmental-friendly printed circuit boards (PCBs), high aspect ratio drill bit and ultra-small micro drill bit, as well as the developments of geometry design of micro drill bit. Design/methodology/approach -The paper details the developments trend and challenges of micro drill and PCBs first. Then the current research status of novel micro drill bits for flexible circuit boards, environmental-friendly PCBs, high aspect ratio drill bit, ultra-small micro drill bit are described. Finally, the developments of geometry design and drilling process are reviewed. Findings -To achieve excellent performance for drilling flexible PCB, a large helical angle, large flute/land ratio and small web thickness that guarantee the sharp evacuation capability, are adopted in drill bit design. A small helix angle and an appropriate primary face angle are employed for drill bit to process environmental-friendly printed circuit boards. It is beneficial to implement big helix angle, small primary face angles and small point angles in the design of ultra-small micro drill bit. An optimum web thickness and step feed should be taken into consideration in high aspect ratio drill bits design. Originality/value -The paper reviews different solutions of micro drill bits for the state-of-the-art PCB and the developments of geometry design of drill bit for printed circuit boards.

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“…Επίσης ο Armarego και άλλοι [12] πρότειναν ένα νέο σχεδιασμό split point εργαλείου το οποίο αφαιρεί την επίδραση της εγκάρσιας κόψης και μειώνει την απαιτούμενη δύναμη κοπής. Ο Fugelso [13,14] πρότεινε μια νέα μεθοδολογία τροχίσματος η οποία δίνει τη δυνατότητα κατασκευής εργαλείων με μεγάλη γωνία ελευθερίας και επίσης μια νέου τύπου εργαλειομηχανή με μεγάλη ακρίβεια.…”

Section: περιγραφή της γεωμετρίας του εργαλείου διάτρησηςunclassified

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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Conical flank twist drill points

Cited by 10 publications

References 6 publications

CAD Based Mechanistic Modeling of Forces for Generic Drill Point Geometry

CAD Based Mechanistic Modeling of Forces for Generic Drill Point Geometry

Challenges and developments of micro drill bit for printed circuit board: a review

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

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