Page 35 - 《橡塑技术与装备》英文版2025年12月

MACHINERY AND MOLD

speed to CCS. Given the multitude of rotor shaft models, drill deflection, vibration, or even breakage. Both too large
setting the linear speed and maximum rotational speed can and too small a pilot hole make it difficult to form an oil film
save programming time and eliminate the need for extensive between the guide bar and the pilot hole, which can easily lead
calculations. Of course, nowadays, automated programming to wear of the guide bar.
is prevalent, especially for such high-end equipment. It is also In this document, the D15 hole, with a length of 800 mm,
feasible to automatically calculate the speed for each part, is pre-drilled using a D15 alloy drill bit, D15 (+0.015 to 0.04),
depending on individual needs and preferences. with a drilling depth of 1.5D=22.5.
G92 S250 R1
G96 S200 P1 R1 M204
Fine-tune each conical surface, set the rotational speed to
RPM, and maintain a constant speed.
G97 S200 R1 M204
Due to the milling of small diameters, a relatively high
rotational speed is required. The MAZAK equipment has
two speed settings: M238 for diameters smaller than S320
and M239 for diameters larger than S320, which control the Figure 10 Using gun drill on turn-milling compound
rotational speed settings.
8.5 OP6 dynamic turning
Using the Profit dynamic turning and cycloidal turning
methods in ESPRIT, turning slots can save 50% of the time,
with smoother machining of curved movements and reduced
tool wear.

Figure 9 Dynamic turning tool path
8.6 Gun drill Figure 11 Using gun drill on turn-milling compound
In the past, a guide bushing was used for guiding the
gun drill during machining. Nowadays, in the application of
machining centers, a guide hole is used instead of a guide
bushing, as shown in Figure 10. The diameter of the pre-drilled
guide hole is slightly larger than the basic size of the gun drill,
and its length is approximately 1.5 times the diameter. This
allows the gun drill, which enters the machining state later,
to use the guide hole as a guide bushing. The cooperation
between the guide bar on the gun drill and the guide bar of the
guide hole ensures the linear feed of the gun drill. Figure 12 Gun drill pre-drilling
Before the gun drill enters the guide hole, turn off the
Insufficient length of the pilot hole can easily cause gun

Vol.51 51 卷 ·29·
年，2025
·29·
2025 第