Page 14 - 《橡塑技术与装备》英文版2025年12月

HINA R&P TECHNOLOGY AND EQUIPMENT

blade to be higher than that of the workpiece being machined Subsequently, during the machining process, we
when boring the inner hole (see Figure 5). experimented with a 75° clamped boring tool. This tool is
Furthermore, due to the special shape of the inner hole highly suitable for the rough machining stage of the barrel.
on the cylinder, which is shaped like an "8" and disconnected Through comparative tests, we found that rough boring a
in the middle, it requires that the cutting tool not only has double hole in a barrel using round inserts takes up to 12
sufficient hardness but also good toughness. The hardness and hours and consumes 6 inserts. However, after adopting the
toughness of cutting tools are often contradictory. Cutting tools 75° clamped boring tool, the machining time was shortened
with high hardness tend to be brittle, while those with good to only 3 hours, and the number of inserts consumed was also
toughness have lower hardness. This contradiction poses a reduced to 2, significantly reducing machining time and insert
significant challenge when selecting cutting tools. costs. Nevertheless, despite the tool's excellent performance in
the rough machining stage, it still fails to meet the roughness
requirements of the barrel (see Figure 7).

Figure 5 Various test blades

In order to find a suitable tool, we tried various types of
cutting tools, including welded tools, mechanically clamped
tools, and even ceramic inserts. None of these tools achieved
the expected results during the machining process. Although Figure 6 Circular milling insert
they excelled in certain aspects, there were always some key
performance indicators that failed to meet our needs.
(2) In order to enhance the efficiency and quality of
double-hole machining for machine barrels, we have conducted
in-depth optimization research on cutting tools. Through
repeated experiments and analysis in the early stages, we
have identified several key characteristics for selecting cutting
inserts: wear resistance, impact resistance, and sharpness.
These characteristics are crucial for improving machining Figure 7 75° Mechanically Clamped Turning Tool
efficiency and ensuring machining quality.
To further meet the processing requirements, we
Firstly, we chose "round" milling inserts for the ultimately chose "coated three-sided milling cutter with
experiment. By altering their shape, these inserts enhance
clamped inserts". This insert combines the wear resistance of
the toughness of the tool, thus revolutionizing the traditional
the coating with the sharpness of the three-sided cutting edge,
boring method. We employed round inserts instead of making the tool perform excellently during processing. We
traditional tool tips for boring and discovered that this novel
designed the corresponding tool based on the insert model and
approach is both wear-resistant and impact-resistant. However,
customized the boring tool body through the tool manufacturer
round inserts perform well under conditions of low cutting (see Figures 8 and 9). During the customization process, we
volume. Once the cutting volume is increased, the contact area
optimized the angle of the boring tool body four times to find
of the insert expands, leading to intensified tool vibration and
the optimal cutting angle and stability. These optimization
even tool breakage, thereby reducing machining efficiency (see
measures include adjusting key parameters such as the tool's
Figure 6).
rake angle, relief angle, major cutting edge angle, and minor

·8· Vol.51，No.12