Terminology on laser-beam machining (LBM)

Terminology on laser-beam machining (LBM)

Technische Hogeschool Eindhoven (THE). Afd. Werktuigbouwkunde. Laboratorium voor Mechanische

Technologie en Werkplaatstechniek (1972). Terminology on laser-beam machining (LBM). (TH Eindhoven. Afd. Werktuigbouwkunde, Laboratorium voor mechanische technologie en werkplaatstechniek : WT rapporten; Vol. WT0299). Technische Hogeschool Eindhoven.

Document status and date: Published: 01/01/1972

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ARK

01

lJPR

WT 0299

Eindhoven University

of Technology

department

of mechanical engineering

report

of the production

engineering laboratories

WT-RAPPORT No.0299

EINDHOVEN UNIVERSITY PRESS 1972

THE NETHERLANDS

TERMINOLOGY ON LASER-BEAM MACHINING (LBM)

Provisional recommendation of C.l.R.P. Working Group E

Terminology on Laser-beam Machining CLBM) March 1972

1. Wave length Wellen lange Longueur d'onde

The wave length of the laser light. 2. Order

Ordnungszahlen Ordre

I

m,n

The order of the transverse modes 1n x andy, r and ~ direction resp.

3. Working distance b(mm)

Arbeitsabstand Distance du travail

The distance between the plane of the lens and the target plane (see Fig. 1).

4. Focal distance Brennweite Distance focale

The distance between the plane of the lens and the plane of the focal spot (see Fig. I).

5. Focal spot radius Brennfleckradius Rayon du foyer

The radius of the laser-beam, measured in the plane of the focal spot (see Fig. 1).

6. Theoretical focal spot radius Theoretische Brennfleckradius Rayon du foyer theorique

-2-in which

A

=

2R . . f f . I

- - = open1ng rat10 0 the ocuss1ng ens fb

m = order

7. Working spot radius Arbeitsfleckradius

Rayon de la tache du travail

The radius of the laser-beam, measured 1n the target plane (see Fig. 1).

8. Source radius Quellenradius Rayon de la source

The radius of the initial laser-beam (see Fig. 1).

9. Beam initial divergent angle Strahloffnungswinkel

Angle d'ouverture du rayon

r (urn) o

Ci.

o

The angle of divergence of the beam before the influence of the adaptive lenses (see Fig. 1).

10. Beam final convergent angel Strahlapertu r

Aperture du rayon

The angle of convergence of the beam after the influence of the focussing lens (see Fig. 1).

11. Focussing lens aperture Eintrittsapertur

Aperture de la lentille

The angle with which the beam incidences the; focussing lens (see Fig. 1).

-12. Pulse cycle time Impulsperiode

Periode de repetition

-3-t (us, ms)

p

The cycle time of the light pulses supplied by the laser source (see Fig. 2). 13. Pulse duration Impulsdauer Duree de l'impulsion t.(].Js,ms) ~

The duration of the light pulses supplied by the laser source (see Fig. 2).

14. Pulse interval Impulspause

Intervalle des impulsions

The time between two successive pulses (see Fig. 2).

t t - t.

o P ~

15. Duty cycle Tastverhaltnis

Duree relative des impulsions

t (].J s, ms) o

T

The ratio between the pulse duration and the pulse cycle time.

T

=

~ p

16. Pulse frequency Impulsfrequenz

Frequence des impulsions

The number of pulses supplied per second.

f

11

p P

17. Pulse quantity n

Impulszahl

Nombre des impulsions

18. Spike duration Spikedauer Duree du barreau -4-t (us) sp

In case of a laser which supplies the light in discrete magnitudes ,the duratQon of such a magnitude.

19. Spike frequency Spikefolgefrequenz Frequence des barreaux

The number of spikes supplied per second.

20. Instantaneous beam power Momentaner Strahlleistung Puissance instantanee du rayon

f (kHz) sp

P. (W)

~

The instantaneous power of the beam supplied to the target surface.

21. Average pulse power Mittlere Impulsleistung

Puissance moyenne de l'impulsion

P. (W)

~

The arithmetic mean value of the. power of the pulse supplied to the target surface.

-

f

The energy of the pulse supplied to the target surfa~e.

-A. == P. t.

1 1 1

23. Average pulse power density Mittlere Impulsleistungsdichte

Densite de puissance moyenne de l'impulsion

The arithmetic mean value of the power of the pulse devided by the area of the working spot.

6 -10 • P.

1

24. Beam density value Richtstrahlwert Valeur du rayon -5-2 R (W/mm sr) o

Value of a beam source indicating the surface power density emitted per unit space angle.

lO6. p

R = 0

0 2

nr • 'ITa

0 0

25. Beam penetration range Laserstrahlreichweite Portee du rayon

2

R (]lm)

e

The penetration range of the laser beam in the material in case of a perpendicular incident beam. The penetration range depends on the wave length and the properties of the material.

Re = f(A, material)

26. Beam reflection ratio Reflexionsvermogen Propriete de refelexion

The ratio of the reflected and the incident beam power. The beam reflection ratio depends on the wave length and the properties of the material.

qr = f(A, material)

27. Workpiece removal per second Abtraggeschwindigkeit

Volume enleve

a

The volume of material removed per second.

28. Workpiece removal per pulse Impulsabtrag

Volume enleve

a

3 V

Wi (mm )

The volume of material removed per second devided by the frequency.

_ Vw

V_{Wi -}

f

inten-sity

1

,.

,