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Positional Accuracy of Drilled Holes

Jacek Kaminski (Institutionen för produktionsteknik)
Göteborg : Chalmers University of Technology, 1992. ISBN: 91-7032-757-2.- 43 s.

When selecting hole-making sequences, the positional accuracy mainly is determined during the first drilling operation. This dissertation consists of three papers which consider the influence of various factors on hole positional accuracy when drilling in inclined workpieces using high-speed steel twist drills with conventional point geometry.

The chisel edge action, during the first few revolutions after contact with an inclined workpiece surface, causes the drill wandering phenomenon and thus the drill deflection. The influence of factors like drill length, rigidity, workpiece material, surface slope, and cutting resistance, as well as the machining data has been investigated in experiments, results of which have been presented and discussed.

Mechanisms of chip formation at the chisel edge also have been investigated. A mathematical model for chip areas and corresponding cutting forces has been proposed and implemented in a computer program. If the flexibility of the drill also is implemented in it, as suggested in my equations, the program can be used to analyze the drill wandering.

Nyckelord: hole-making, drilling, hole positional accuracy, drill wandering, high-speed steel twist drills, conventional point geometry, drill length, rigidity, workpiece material, surface slope, cutting resistance, chip areas, corresponding cutting forces

Denna post skapades 2006-09-19. Senast ändrad 2013-09-25.
CPL Pubid: 1490


Institutioner (Chalmers)

Institutionen för produktionsteknik (1900-2003)


Teknisk mekanik

Chalmers infrastruktur

Ingår i serie

Doktorsavhandlingar vid Chalmers tekniska högskola. Ny serie 908

PTA - Department of Production Engineering 92:05