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Development and Key Technology Analysis of High-Power CNC Laser Cutting Machine Tools
Abstract
High-power CNC laser cutting machine tools have become rapidly developing metal forming equipment over the past decade. Compared with traditional cutting machines, they offer superior processing flexibility, high speed, high efficiency, and operate without vibration or noise. This paper introduces the development trends of high-power laser cutting, improvements in CNC laser cutting machines, and their key technologies. It also analyzes the hazards of lasers to the human body and protective measures. Long-term practice proves that this improved scheme is feasible and possesses excellent stability.
Introduction
Laser cutting offers advantages such as excellent controllability, vibration-free and noise-free processing, no tool wear, and low environmental pollution. Internationally, the industry grows by 20%-30% annually. As an indispensable tool for 21st-century sheet metal processing, high-power laser cutting is evolving in the following directions:
- Combined use of high-powerlasers with high-performance CNC and servo systems to achieve high processing speeds and productivity, reducing heat-affected zones (HAZ) and thermal deformation while increasing the range of cuttable material thickness.
- Development toward high automation and intelligence by applying CAD/CAPP/CAM and AI to high-powerlaser processing.
- Improving performance by establishing process databases and adaptive control systems to regulate high-powerlaser output relative to speed.
- Integration of high-powercutting, welding, and heat treatment into unified laser processing centers.
- Development of web-based network databases and neural networks to automatically determine high-powerprocess parameters and enable remote control.
- The rise of 3D high-powerlaser cutting machines to meet the 3D workpiece needs of the automotive and aerospace industries.
1. High-Power Optomechanical Linkage Laser Cutting Machine Tools
1.1 Composition of High-Power Laser Cutting Equipment
A complete high-power laser cutting system consists of the laser source, beam delivery and focusing system, worktable, power and control units, gas and water sources, operation panel, torch, and CNC device.
- Laser Source:Provides the light energy required for high-power It must be stable, reliable, and adjustable.
- Beam Delivery and Focusing System:Transfers and focuses the high-power beam onto the workpiece. Large-scale systems often use reflective mirrors or fiber optics for better power density and flexibility.
- Worktable:Driven by servo motors for precise positioning.
- Control Device:Performs real-time display, parameter control, and protection for the high-power
- Gas and Water Sources:Inert gases protect the kerf and lenses from contamination, while water cooling reduces the temperature of high-power
- CNC Device:Commands the machine to process parts based on programmed instruction codes.
1.2 Gantry-Type High-Power Optomechanical Linkage Machine Tools
CNC laser cutting equipment that integrates the laser source, the machine tool, and the NC system into a single mechatronic unit offers numerous advantages—including superior overall performance, a compact footprint, and lower costs—making it highly adaptable for various industrial applications. In systems where the laser source is physically separated from the machine tool, the relative motion between the workpiece and the laser beam can be achieved in two ways: by moving the beam while keeping the worktable stationary, or by moving the worktable while keeping the beam stationary. By synthesizing the characteristics of both approaches, this design adopts a “laser-machine linkage” strategy.
First, the machine tool is designed with a gantry-type structure, as illustrated in Figure 3. The laser source is mounted in conjunction with the moving Y-axis assembly, forming the crossbeam section of the machine tool. Second, the system is configured such that the laser beam executes relatively short-range movements along the Y-axis, while the workpiece executes longer-range movements along the X-axis. This arrangement not only results in a more compact machine structure but also—provided the Y-axis travel remains within a specific limit—eliminates the need for a beam expander, thereby reducing equipment costs. Furthermore, the gantry layout facilitates centralized fume extraction, material unloading, and comprehensive safety enclosure.
During laser cutting, workpieces—particularly large components or thin sheet metal—are prone to thermal deformation, making it difficult to maintain a constant focal position. Consequently, the machine must be equipped with an automatic laser focus tracking system to regulate the focal height. This system comprises specialized non-contact height sensors, signal processing circuitry, control logic, and drive mechanisms, ensuring the production of high-quality cut seams. The structural design of this machine tool is illustrated in Figure 4.
The aforementioned design fully capitalizes on the inherent characteristic of laser cutting—namely, the absence of cutting forces—to optimize various aspects of the machine tool, including its transmission system, precision assurance mechanisms, and overall layout. Furthermore, in-depth research was conducted on critical technologies such as high-speed machine operation and the miniaturization of the focusing system, thereby laying a solid foundation for further enhancements in the machine tool’s overall performance.
2. Key Technologies of High-Power Optomechanical Linkage Machines
2.1 Focusing and Lens Selection for High-Power Beams
The focusing lens is a critical factor. Due to the high energy involved, high-power laser transmission requires strict control over lens material uniformity, low absorption, and high thermal conductivity. Plano-convex lenses are typically selected for their ideal performance in high-power cutting and welding.
2.2 Height Control in High-Power Systems
The linkage machine utilizes a non-contact capacitive sensor to maintain a constant height between the nozzle and the workpiece, avoiding mechanical wear and ensuring stable high-power output quality.
2.3 Auxiliary Gas and Nozzle Design
Most metal cutting requires active gases like oxygen. In high-power operations, gas pressure must be precisely adjusted—higher pressure prevents dross on thin materials, while lower pressure is suited for thicker plates.
2.4 High-Power Beam Delivery Systems
The system consists of expanders, circular polarizers, and focusing lenses. To mitigate thermal deformation caused by the energy absorption of the lenses, mirrors must be made of oxygen-free copper with gold plating and direct water cooling to handle the high-power load.
2.5 Cutting Speed
Optimal speed in high-power cutting is determined by energy balance and heat conduction formulas, considering beam power density, mode, spot size, and material properties.
3. Safety Concerns in High-Power Laser Cutting
High-power lasers possess extremely high energy density and involve tens of thousands of volts, necessitating strict safety protocols.
3.1 Hazards of High-Power Lasers to the Human Body
Due to high energy, prolonged exposure can damage the retina or cause blindness. Diffuse reflections during high-power processing can cause chronic eye injury. Direct skin exposure can lead to burns or inflammation. Additionally, high-power evaporation of certain materials produces toxic fumes.
3.2 Safety Protection for High-Power Equipment
- Equipment:Reliable grounding, interlocking doors, and optical paths enclosed in metal tubes.
- Facility:Worktables should have glass shields, and the area should be partitioned by fences or screens.
- Personal:Staff must wear wavelength-specific goggles and white work clothes to reduce the impact of high-power diffuse reflections.
- Environment:High-efficiency ventilation is required, and fire-extinguishing equipment must be accessible to handle emergencies during high-power cutting.
4. Conclusion
High-power laser cutting technology has revolutionized traditional metal processing, especially in precision industries. When high-power optomechanical linkage CNC machines are equipped with real-time monitoring and thickness detection, they achieve automated, high-precision cutting with low manufacturing costs. Furthermore, by adjusting parameters, these machines can be used for welding and drilling, fulfilling the versatile functions of a high-power processing center.
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