Copper plate cutting presents a high-tech challenge in laser cutting machine applications. Due to its high reflectivity and thermal conductivity, improper operation can easily damage the equipment. This article will guide you on how to safely and efficiently use a laser cutting machine to process copper plates.

Core Challenges and Safety Prerequisites

Copper surfaces have a reflectivity of over 90% to fiber lasers, and reflected light can severely damage the laser cutting machine's lens and laser. Therefore, the primary prerequisite is to use a professional laser cutting machine with "high reflectivity" capabilities; the use of ordinary equipment is strictly prohibited.

Key Technical Parameters and Processes

Gas and Nozzles: High-purity nitrogen (≥99.99%) must be used, with a pressure typically between 1.8-2.5 MPa. Simultaneously, a double-layer nozzle (recommended diameter Φ1.5mm) must be selected to stabilize the airflow and protect the lens.

Power and Speed: A "high power, low speed" strategy is required. For example, when cutting a 2mm copper plate with a 4000W laser cutting machine, the speed should be set at 1.5-2.5 m/min, and a pulse mode should be used to control heat input.

Focus Position: Typically set to negative defocus (focus below the surface of the plate), which helps with energy absorption and reduces spatter.

Practical Tip: Applying a matte black paint coating to the copper plate surface before cutting significantly improves laser absorption, a key technique for ensuring cutting results.

Summary: Successfully cutting copper plates with a laser cutting machine relies on professional anti-reflective equipment, strict process parameters, and effective surface treatment. Following this guide will help you overcome challenges and achieve high-quality copper processing. If the above does not answer your questions, please contact RITMAN laser's professional after-sales service for assistance.