Tiêu Chuẩn Iso 00230-2-2014 Amd1-2016.Pdf

© ISO 2016 Test code for machine tools — Part 2 Determination of accuracy and repeatability of positioning of numerically controlled axes AMENDMENT 1 Code d’essai des machines outils — Partie 2 Déterm[.]

Test c ode for machine tools —

Part 2:

repeatability ofpositioning of

Code d’essai de s machines-o tils —

Partie 2: Déte mination de l’e xactitude et de la ré éta ilité de

p sition ement de s a e s à comma de n mérique

Fourth edition

2 14-0 -0

Refer ence n mb r

ISO 2 0-2:2 14/A md.1:2 16(E)

AMENDMENT 1

2 16-0 -1

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c onditio s fr metal c ut in machine to ls

Test c ode for machine tools —

Part 2:

A dd Annex E aft er D.3:

Annex E

( informative)

Le st inc ement step

E.1 General

Machine t ools ar designed t o o e at e o e a wide rang e of fe d spe ds an tra el dis anc s along

in ivid al ax es of motion An important aspe t of positioning along an in ivid al a is of motion is

the r solution of such p sitioning This is r fe r d t o as leas inc ement st ep or minimum p sitioning

inc ement This ca a i ty l mit a machine t ool’s a i ty t o make smal cor e tions in position These

smal cor e tions ar ne es ary for n me ical compensations for v rious sour es of p sitioning

e rors, such as b l sc ew pit ch, r ve sal e ror, the mal dist ortions, e rors d e t o g eometry, such as

s raightnes , sq ar nes , an p ralel sm, as wel as co rdination of ax es

In gene al, the leas inc ement s ep ma depen on the r solution of the p sitioning fe db ck devic s,

n me ical control alg rithms, as wel as machine cons ruction (e.g friction, pr lo ds, etc ) an

machine con ition

W ith the leas inc ement st ep t es , the smales inc ement at w hich the machine can position in a

spe if ied pe iod of time is det ermined This t es is ty icaly not inclu ed in ac eptanc t es ing

E.2 Test con itio s

The t es setup an proc d r desc ibed below a pl es t o al ax es of lnear motion Howeve , a simiar

proc d r can be used for ax es of rotary motion

Any ins rument ha ing smal me hanical or ele trical hyst er sis (≤ 0 % of the desir d leas inc ement

st ep) an a short measuring rang e can be used t o measur the leas positioning inc ement of the a is

Ex mples inclu e the folowing:

— lase int erfe omet er with positioning e ror o tics;

— non-contact displac ment sensor such as ed y cur ent or ca acitive ty e;

— high r solution LVDT contact measur ment devic

The measuring ins rument is mou t ed such that it measur s the displac ment between the t ool an

the workpie e Any t ool or workpie e spin le, if a plca le, is locked eithe through se v control or b

ext ernal me hanism (bracket, ma net, et c )

The machine a is is pro rammed t o move in 1 st eps, each at the spe ified p sitioning r solution, in

the p sitive dir ction with 5 s dwel time aft er r aching each targ et The same t en st eps ar r peat ed in

the neg tive dir ction an then in the p sitive dir ction a ain

If no motion is det ect ed aft er t en st eps then the entir t es ist o be r peat ed inc easing the st ep siz

The leas inc ement st ep isthe ma imum a solut e v lue of the dife enc betwe n the comman ed an

actual p sitions plus the positioning r solution ( i.e st ep siz a pled for this t es )

It is known that the siz an dir ction of a pro ch t o the f irs targ et can afe t the r sult of this t es

To achieve a r prod cible t es , the ma nitu e an dir ction of a pro ch should be a r ed an r port ed

Alt ernatively, the t es ma be pe formed a plying a dynamic acq isition mode, e.g with a lase

int erfe omet er In this case, the entir t es (3 st eps) isr peat ed as the st ep siz is grad aly inc eased

unti the machine a is p sitions with clearly def ina le (cou ta le) st eps, w he e extraneous machine

motion d e t o o e sho t, set lng, r ve sal e ror an vibration does not ex ce d the commanded st ep

The st ep siz that f irs satisf ies these c it eria is the leas inc ement st ep Figur E.1 show s sample

r sult from the leas inc ement st ep t es s

a)Axis not satisfying the c iteria of le st inc ement step of 0,001 mm — No cle rly

definable(co ntable) steps

b)Axis satisfying the c iteria of le st inc ement step of 0,00 mm — Cle rly definable

(co ntable) steps

Figure E.1 — S mple le st inc ement step test results