The dynamic geometry of a twist drill point

Salama, A.E.; ElSawy, Ahmed

doi:10.1016/0924-0136(95)01819-0

Cited by 9 publications

(4 citation statements)

References 10 publications

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“…Boston and Gilbert [25] examined the forces on a drill, end-load and torque, depend on cutting conditions. Then, many authors [26][27][28] have subsequently investigated how forces depend on drill geometry. A general conclusion is that end-load largely depends on the chisel edge, while most of the torque contribution comes from the cutting action of the two main cutting edges.…”

Section: Tool Materials and Geometricsmentioning

confidence: 99%

A Review on Drilling Printed Circuit Boards

Zheng

Wang

Yue

et al. 2011

AMR

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Drilling is a particularly complicated machining process, and it becomes much more complicated when the workpiece is printed circuit boards (PCBs). PCB is composite materials with anisotropy. Even a small defect in PCB may cause great losses. Both the drilling process and PCB structure design have been researched by many scholars. But the investigations into the drilling processes of PCB are not systematic. The present review article address the report about tool materials and geometrics, cutting force, cutting temperature, radial run-out and damages occurring in drilling processes. And as a conclusion, some of these critical issues are proposed to meet the challenges in analysis and optimization for PCB drilling.

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Section: Tool Materials and Geometricsmentioning

confidence: 99%

A Review on Drilling Printed Circuit Boards

Zheng

Wang

Yue

et al. 2011

AMR

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“…The sharpening method of drill flank surface is an important term to affect the life and strength of the PCD inserts. A twist drill is characterized by complex geometry which is a direct function of the sharpening method used [3]. Armarego [4] and Fuller [5] attempted to understand the effect of sharpening method on the cutting mechanism of the drill point .…”

Section: Introductionmentioning

confidence: 99%

Influence of the Sharpening Methods for Drill Flank Surfaces on the Compressive Strength of PCD Inserts

Chen

Huang

et al. 2011

AMR

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In this paper, a polycrystalline diamond drill was designed to machine non-ferrous difficult-to-machine materials. The effect of the sharpening methods for drill flank surfaces on the compressive strength was investigated by using finite element method. The results show that the compressive strength of plane grinding is better than that of conical grinding method, however, with the increasing of the clearance angle of the drill, the compressive stress increased significantly.

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“…Watson [12] presented relationships for the various angles on the cutting edge and chisel edge of a twist drill, and showed diagrammatically the effects of radius and feed on the various parameters. Salama and ElSawy [13] considered the tool and working geometry of a double plane sharpened twist drill point. They concluded that the effects of feed could be neglected in an investigation of cutting edge geometry and cutting action without introducing any significant error.…”

Section: Introductionmentioning

confidence: 99%

Drill point geometry of multi-flute drills

Hsieh

Lin

2004

Int J Adv Manuf Technol

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This paper presents a comprehensive mathematical model for analysis of the geometries of conical, hyperboloidal, and ellipsoidal drills. The proposed method includes three particular features. The first is that a rotational disk-type abrasive wheel is modeled by revolution geometry, thus allowing for the normal and tangent vectors of an abrasive wheel to be obtained explicitly. Consequently, the tangent and normal vectors along the cutting edges and chisel edges of the produced drill can be obtained. The second feature is the ability of the model to determine and express drill geometries and characteristics (semi-point angle, tool cutting edge inclination, chisel angle, normal rake angle and normal clearance angle) according to all current international standards. Thirdly, the drill's working geometries are investigated by taking the effect of feed motion into consideration. We found that cutting edge geometry can be studied without significant error even though we neglect the effect of feed. The chisel edge working geometry shows greater variation than tool geometry. Consequently, the effect of feed must be taken into consideration when studying chisel edge action during drilling operation.Keywords Drill point geometry · Multi-flute drill Nomenclature list(xyz) 0 Coordinate frame (xyz) 0 built in drill (xyz) t Coordinate frame (xyz) t built in grinding wheel 0 A t,i , 0 Λ t,i The configuration matrices of frame (xyz) t with respect to drill frame (xyz) 0 when the grinding wheel

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The dynamic geometry of a twist drill point

Cited by 9 publications

References 10 publications

A Review on Drilling Printed Circuit Boards

A Review on Drilling Printed Circuit Boards

Influence of the Sharpening Methods for Drill Flank Surfaces on the Compressive Strength of PCD Inserts

Drill point geometry of multi-flute drills

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