The differences between boring machines and milling machines

The core differences between boring machines and milling machines lie in the processing objects, motion modes and precision grades: ‌ boring machines focus on high-precision hole system processing and correct the hole diameter through tool rotation; Milling machines excel in plane and curved surface forming and rely on multi-axis linkage cutting ‌.

Definition and functional positioning ‌

A boring machine is a precision hole processing equipment with the rotation of the boring tool as the main motion. It is mainly used for processing high-precision hole systems (tolerances up to IT6 grade) and complex inner cavities on box-type parts. By fine-tuning the tool head, a hole diameter correction of 0.001mm can be achieved. Milling machines achieve the processing of planes, curved surfaces and cavities by rotating multi-edge milling cutters in coordination with multi-axis feed of the workpiece. A typical example is the five-axis linkage milling of aviation turbine blades. ‌ ‌

Core difference Analysis ‌

1. processing characteristics ‌.

Boring machine: The coaxiality of the processed hole is ≤0.01mm, and the surface roughness is Ra0.05μm. It is particularly suitable for deep hole (≥200mm) and hardened steel (HRC60+) processing. When equipped with a flat rotary table structure, end face milling can be completed. ‌ ‌

Milling machine: It achieves efficient cutting through multi-tooth tools (6-8 edges), with a linear speed of up to 2000m/min for aluminum alloy processing. However, thin-walled parts are prone to tool deformation due to deflection. ‌ ‌

2.structure of equipment (device)

The horizontal boring machine adopts the BT50 tool holder interface, emphasizing the rigidity of the spindle (for example, the spindle travel of the T68 boring machine reaches 600mm) to resist deflection deformation during deep hole processing. ‌ ‌

Milling machines are mostly equipped with tool magazines and high-speed spindles (16,000 r/min), enabling compound processing of milling, drilling and tapping. Machining centers can increase the processing cycle of gearbox housings by 40%. ‌3. ‌application area

Boring machine: Precision hole system processing for engine cylinder holes, hydraulic valve blocks, etc. The floor boring and milling machine can handle workpieces weighing up to 2000kg. ‌ ‌

Milling machine: For the forming of complex curved surfaces such as mold cavities and aviation structural components, as well as the processing of graphite electrodes, diamond-coated milling cutters are recommended.

technical requirements for operation

Boring machine operation requires skills such as fine-tuning tool head compensation (for example, the repeat positioning accuracy of the Shibang NBJ16 boring tool is 0.003mm) and radial feed control of the rotary table. Workers need more than 2000 hours of experience to stably achieve IT7-level accuracy. Milling machines can achieve automated processing through CAM programming, and junior operators can complete conventional planar milling after three months of training. ‌ ‌