The combination of turning and milling machine tools requires the same spindle to have both high turning torque and high milling speed. The traditional combination of "mechanical spindle+servo turret" is no longer sufficient. The electric spindle transforms into the "heart" by embedding a permanent magnet synchronous motor inside the spindle. In the low-speed section, it outputs 600 Nm and can easily load a Φ 400 mm flange. In the high-speed section, it completes blade surface precision milling at 12000 r/min. One device replaces two, reducing the cycle time by 45%.

Compact structure is the natural advantage of electric spindles. The 45 ° inclined bed design of Zhiheng Machine Tool integrates the electric spindle, turret, and tailstock within a 2.5 m ² area, saving 40% of the space compared to the lathe+milling machine connection; No belts, no gears, noise reduced to 68 dB (A), operators no longer have to wear earplugs to work.

Thermal stability determines accuracy. Through the dual circuit of "axis cooling+shell spiral cooling", the coolant takes away 80% of the heat at a flow rate of 25 L/min, enabling the spindle to achieve radial thermal elongation<5 µ m after 8 hours of continuous milling, and easily and stably complete the machining of H7 level tolerance bearing seats.

Automatic tool changing is an efficiency multiplier. The turning and milling electric spindle launched by HSD company comes with a 0.8-second servo tool library, combined with a 0.3-second high-speed clamping arm, to achieve a 1.1-second flash change from turning tool to milling cutter to drill bit; By cooperating with the 0.001 ° indexing of the C-axis, 11 processes such as external turning, end face milling, eccentric drilling, etc. can be completed in the same program, truly achieving "one-time clamping, complete completion".

With the surge in demand for aerospace titanium alloys and carbon fiber composite materials, the turning and milling electric spindle is evolving towards a ternary balance of "high torque high rigidity high speed"; Silicon carbide bearings, oil mist seals, and online dynamic balancing technology will enable it to maintain a process capability of Cpk ≥ 1.67 at 20000 r/min.