GSK GSK980TDc, Руководство пользователя

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Chapter 3 G Commands
103
Ⅰ
Progra
mming
N10 G00 Z-55 S800 ; (Rapid traverse)
G01 X160 F120; (Infeed to a point
)
X80 W20; (Machining a—b) Blocks for finishing path
W15; (Machining b—c)
N20 X40 W20 ; (Machining c—d)
G70 P050 Q090 M30; (Finishing a—d)
3.20.3 Closed cutting cycle G73
Command format: G73 U( Δ i) W ( Δ k) R (d) F S T ;
⑴
G73 P(ns) Q(nf) U( Δ u) W( Δ w) ; ⑵
N (ns) ．．．．． ;
．．．．．．．
;
．．．．
F;
．．．．
S;
⑶
．．．．
;
·
N (nf)
．．．．．
;
Command functions: G73 is divided into three parts:
⑴
Blocks for defining the travels of tool infeed and tool retraction, the cutting speed, the spindle
speed and the tool function when roughing;
Blo
⑵
cks for defining the block interval, finishing allowance;
Blocks for some continuous finishing path, counting the roughing path without being
⑶
executed actually when executing G73.
According to the finishing allowance, the travel of tool retraction and the cutting times, the system
automatically counts the travel of roughing offset, the travel of each tool infeed and the path of
roughing, the path of each cutting is the offset travel of finishing path, the cutting path
approaches gradually the finishing one, and last cutting path is the finishing one according to the
finishing allowance. The starting point and end point of G73 are the same one, and G73 is
applied to roughing for the formed rod. G73 is non-modal and its path is shown in Fig.3-31.
Relevant definitions:
Finishing path: The above-mentioned Part 3 of G73 ( ns
～
nf block)defines the finishing path,
and the starting point of finishing path (start point of ns block)is the same these
of starting point and end point of G73, called A point; the end point of the first
block of finishing path(ns block)is called B point; the end point of finishing
path(end point of nf block) is called C point. The finishing path is A
→ B → C.
Roughing path: It is one group of offset path of finishing one, and the roughing path times are
the same that of cutting. After the coordinates offset, A, B, C of finishing path
separately corresponds to A
n
, B
n
, C
n
of roughing path(n is the cutting times,
the first cutting path is A
1
, B
1
, C
1
and the last one is A
d
, B
d
, C
d
). The
coordinates offset value of the first cutting compared to finishing path is
(
Δ i×2+ Δ u, Δ w+ Δ k) (diameter programming) , the coordinates offset value of
the last cutting compared to finishing path is( Δ u, Δ w) , the coordinates offset
value of each cutting compared to the previous one is as follows:
Δ i: It is X tool retraction clearance in roughing, and its range is ±99999999× least input
increment (radius, unit: mm/inch, with sign symbol) , Δ i is equal to X coordinate offset