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What are the composition and maintenance precautions of the laser cutting machine cutting head?

May 09,2023 | TOPTEK

  1. The composition of the cutting head of the laser cutting machine

The components of the laser cutting machine cutting head are: nozzle, focusing mirror and focus tracking system. The form of the nozzle and the size of the nozzle have a great influence on the cutting quality. There are mainly three types of nozzles: parallel, converging and conical.

The cutting head of the laser cutting machine is specifically composed of a collimating component: it converges the divergent light transmitted from the optical fiber and straightens or collimates it. The collimation assembly also includes a collimation centering part and a water cooling part. Focusing component: placed in the main body to focus the collimated laser beam, the focus position can be changed through the focusing part of the focusing component to meet the needs of cutting different materials and different thickness plates. Protective mirror box: used to isolate the outside world from the internal optical path of the cutting head, ensure the sealing of the optical path, prevent dust and impurities from entering the optical path, and prolong the service life of the fiber optic cutting head. Sensor and control box: It can keep the distance between the cutting head and the surface of the workpiece reliably and stably for a long time, providing guarantee for obtaining the best cutting quality. Cutting nozzle: Installed at the front end of the cutting head, it is the passage of laser beam and auxiliary gas. The auxiliary gas forms a high-speed airflow after passing through the inner cavity of the cutting nozzle. Blow away the molten material to achieve the purpose of cutting.

To use the energy of the laser beam for cutting, the original beam emitted by the laser must be focused through a lens to form a spot with high energy density. The power density at the focus point is the highest, the longer the focal length of the lens, the larger the focus spot, the lower the power density, but the depth of focus is large (depth of focus refers to the distance between two spots with a diameter change of 5% on both sides of the focus, also known as For effective cutting within the cutting range), the operation tolerance is large.

The laser cutting machine focus tracking system generally consists of a focus cutting head and a tracking sensor system. The cutting head is composed of light guide focusing, water cooling, air blowing, and mechanical adjustment; the sensor is composed of sensing elements and amplification control parts. There are two main forms of tracking system, one is capacitive sensor tracking system, also known as non-contact tracking system. The other is an inductive sensor tracking system, also known as a contact tracking system.

Second, laser cutting machine cutting head maintenance precautions

Before the cutting head of the laser cutting machine is off work, use a brush to clean the dust, and then use a dust-free cloth dipped in a small amount of alcohol to clean the entire cutting head (note that it cannot be blown with air); before cutting, check whether the light is emitted from the center of the nozzle, otherwise, please readjust light correction. Check the roundness and cleanliness of the nozzle before cutting, and clean the nozzle; check whether the protective lens is clean every day, otherwise, please clean the protective lens with isopropyl alcohol or analytical alcohol (alcohol content above 99.5%), and wipe it clean without leaving any water marks. Check the ceramic rings, SMA wires, SMA pins, and preamplifiers for looseness and foreign matter every day, please tighten them and clean them.

The above is the analysis of the composition and maintenance precautions of the laser cutting machine cutting head. The main products of Lixing Laser include laser cutting machine, full CNC hydraulic bending machine, laser welding machine, laser marking machine and laser application automation equipment, etc., which are used in sheet metal processing, chassis cabinets, lighting, mobile phones, 3C, kitchen utensils, bathrooms , Auto parts machining and hardware industry. Click on the right to make an appointment for free proofing, online consultation, free telephone consultation, follow Lixing Laser WeChat service account, and learn more about laser cutting machines.

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