June 6, 2024

When CNC machining small glass pieces measuring 20*20cm and 3mm in thickness, with a machine performance of 4500rpm and 4m/min, the following precautions should be taken:

  1. Tool Selection: It is recommended to use diamond-coated grinding heads or specialized glass cutting tools. Diamond coating enhances tool wear resistance and cutting efficiency, making it suitable for machining hard materials like glass.

  2. Tool Parameter Settings: Considering the machine's spindle speed of 4500rpm, it is important to set an appropriate cutting speed that matches this rate to avoid glass breakage due to excessive speed. A feed rate of 4m/min is a reasonable choice, but the actual value may need fine-tuning based on the machining situation.

  3. Workpiece Fixture: Since the glass is thin (3mm), it can easily shift or break during machining, so it is crucial to ensure the workpiece is fully secured. Use specialized clamps or a vacuum holding table to stabilize the glass and prevent movement during processing.

  4. Use of Coolant: Although the use of coolant is not common in glass machining, to reduce the temperature in the cutting area, consider using a non-oil-based coolant to prevent glass damage due to overheating.

  5. Machining Path Planning: When writing the machining program, it is advisable to guide the tool along the edges of the glass as much as possible and avoid rapid movements over the surface of the glass to minimize the impact of cutting forces.

  6. Monitoring During Machining: Due to the brittleness of glass, it is essential to closely monitor the condition of the tool and workpiece during processing. Any abnormal sounds or vibrations should be immediately investigated to avoid workpiece damage.

  7. Post-processing: After machining, inspect the edges of the glass carefully to ensure there are no cracks or burrs. If necessary, edge polishing can be performed to improve the product's appearance quality.

These detailed precautions for CNC machining small glass pieces are based on the specifications you provided. Should there be any additional specific machining requirements or changes in conditions, these parameters and recommendations may need further adjustments.