It’s not difficult to machine. Brass is an easy-to-machine metal.
Brass is an alloy of copper and zinc (5%-40%), not pure copper. Red copper is also more difficult to machine because it’s softer and requires more precise control during machining.
Material Characteristics
Brass (a copper-zinc alloy) has a moderately soft and hard physical property, making it both easily deformable and subject to work hardening. For example, H62 brass (38-42% zinc) produces dislocation entanglements and nanocluster precipitation during deformation, leading to material hardening.
Machining Difficulties
Deformation: Brass is soft and prone to indentation during clamping. Use a spring chuck with soft jaws to gently support the workpiece and avoid over-clamping.
Tool Sticking: Brass chips easily adhere to the tool during cutting, requiring frequent cleaning (every five pieces).
Delamination Fracture: Delamination fracture is common when machining medium-thick plates (0.5-2mm). Stress distribution can be controlled through progressive layer engraving or vibration-assisted processes.
Solution
Process Optimization:
Micromachining: Use a 0.05-0.1mm cut depth, a rotation speed of 1500-2000 rpm, and evenly apply coolant.
Fine Machining: Apply kerosene to the tool tip to enhance smoothness, or use a diamond tool to achieve a mirror finish (at a higher cost).
Equipment Selection:
Laser Micro-Engraving: 0.3mm thick brass plates can achieve a ±0.005mm tolerance.
CNC Lamination Machining: Roughing removes 80% of the stock, and finishing maintains a feed rate of 200mm/min.
Parameter Control:
Laser power fluctuation ≤5% to prevent zinc evaporation and process errors.
Vibration-Assisted Engraving: 10-20Hz longitudinal vibration reduces the risk of delamination.
Typical Applications
Electronic Devices: Engraving micro heat sink fins (0.08mm height) on 0.15mm brass plates.
Biosensors: Laser engraving interdigitated electrodes (0.03mm line width) on 0.25mm brass plates.
Of course, brass, as a metal material, has excellent processing properties and is easy to form and process. When manufacturing various precision parts, brass can be used as the first choice of material, and different processing methods and processes can be used to achieve different processing effects.
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