I. Manufacturing Process
This heatsink uses a custom-shaped aluminum profile structure specifically designed for laser modules. It needs to balance heat dissipation efficiency with module assembly compatibility. The core process employs aluminum profile extrusion molding + precision machining + surface modification. The specific steps are as follows:
1. Raw Material Selection: 6063 aluminum alloy is preferred (thermal conductivity approximately 201 W/(m·K), excellent extrusion moldability, suitable for complex heat dissipation structures); for high-power laser module heatsinks, 6061 aluminum alloy (higher strength, thermal conductivity 167 W/(m·K)) or 1070 pure aluminum (thermal conductivity 226 W/(m·K), superior heat dissipation performance) can be selected.
2. Profile Extrusion Molding:
◦ A custom-made mold is used to extrude aluminum rods heated to 480~520℃ into a custom-shaped profile, forming an integrated structure including heat dissipation fins, cavities, and tubular channels, ensuring the continuity of the heat dissipation flow.
◦ After extrusion, the material undergoes online quenching and artificial aging (T5/T6 treatment) to eliminate internal stress and improve profile strength, preventing deformation during subsequent processing.
3. Precision Machining:
◦ Sawing to Length: The profile is cut to the appropriate length for the module using a CNC saw, with tolerances controlled within ±0.5mm.
◦ CNC Machining: Milling/drilling is performed on the assembly surfaces, laser module mounting holes, positioning slots, and pipe interfaces to ensure accurate alignment with the laser module and water-cooling pipes; the interior of the heat dissipation cavity is precision-bored to ensure smooth flow channels and improve water cooling efficiency.
◦ Deburring/Chamfering: The edges of the fins and holes are blunted to prevent sharp edges from scratching the module or pipes.
4. Surface Treatment:
◦ Anodizing: A 10-20μm thick black hard anodizing coating is applied to improve the radiative heat dissipation efficiency of the heat dissipation surface, while also enhancing corrosion resistance and wear resistance. The fin surface can be sandblasted to increase the heat dissipation surface area.
◦ Thermally Conductive Coating: A thermally conductive ceramic coating is sprayed onto the module mating surface to reduce contact thermal resistance and improve heat conduction efficiency.
◦ Electrophoretic Coating: For outdoor laser module heat sinks, an electrophoretic coating process is used to enhance weather resistance and insulation.
5. Inspection and Trial Assembly: The dimensional accuracy of the profile and the sealing of the heat dissipation channels (water-cooled type) are inspected, and the heat sink is assembled and trial-fitted with the laser module to verify the fit and heat dissipation effect.
II. Processing Accuracy
This heat sink needs to meet the precision assembly and heat dissipation requirements of the laser module. The core accuracy indicators are as follows:
1. Dimensional Accuracy:
◦ Planar dimensional tolerance of the laser module mounting surface: ±0.05mm, ensuring a tight module fit.
◦ Mounting hole position tolerance: ≤0.08mm, hole diameter tolerance H7 grade (+0.018/0mm), ensuring screw tightening without deviation.
◦ Water cooling pipe interface inner diameter tolerance: ±0.03mm, ensuring a tight seal with the water pipe.
◦ Profile length tolerance: ±0.2mm, adapting to the overall installation space of the equipment.
2. Geometric Tolerances:
◦ Mounting surface flatness: ≤0.05mm/100mm, reducing the contact gap between the module and the heatsink.
◦ Perpendicularity of the heatsink cavity axis to the mounting surface: ≤0.05mm, ensuring smooth water cooling flow.
◦ Fin parallelism: ≤0.1mm, ensuring uniform heat exchange in air cooling.
3. Surface Precision:
◦ Module mating surface roughness Ra0.8~1.6μm, reducing contact thermal resistance.
◦ The inner wall roughness of the heat dissipation channel is Ra 1.6~3.2μm to reduce the flow resistance of the water-cooling medium.
◦ The surface roughness (after anodizing) is Ra 3.2μm to ensure surface texture and adhesion of the heat dissipation coating.
III. Industry Applications
This type of laser module profile heat sink, with its integrated heat dissipation, lightweight, and customization characteristics, is widely used in various laser equipment fields. Core applications include:
1. Industrial Laser Processing Equipment:
◦ Fiber laser cutting head module heat sink, CO₂ laser engraving machine emitting module heat sink, adapting to the continuous heat dissipation requirements of high-power laser modules.
◦ Laser welding machine welding head module heat sink, laser marking machine galvanometer module heat sink, ensuring the stability of equipment during long-term operation.
2. Laser Measurement and Inspection Equipment:
◦ Laser rangefinder emitting/receiving module heat sink, laser profilometer scanning module heat sink, adapting to the miniaturization and low-power heat dissipation requirements of precision inspection equipment.
◦ Heat sink for the core laser emission module of LiDAR (LiDAR), used in scenarios such as autonomous driving and drone mapping to ensure accurate ranging.
3. Consumer-grade laser equipment:
◦ Heat sink for the light source module of laser projection equipment and the laser scanning module of laser printers, balancing lightweight design and efficient heat dissipation.
◦ Heat sink for the emission module of beauty laser equipment (such as laser hair removal devices and freckle removal devices), adapting to the heat dissipation requirements of miniaturized medical aesthetic devices.
4. Laser communication and optoelectronic equipment:
◦ Heat sink for the laser transceiver module of fiber optic communication and the emission module of satellite laser communication, meeting the lightweight and high reliability requirements of the aerospace field.
◦ Heat sink for the light source module of stage laser lights, ensuring the stability of laser light projection over long periods.
