The machining of precision metal fan blades usually requires the following steps and processes:

1. Design and planning:

Determine the blade specifications: Design the shape, size, and Angle of the blades according to the requirements of the fan, working environment, and performance indicators. For example, the design of fan blades for aeroengines needs to take into account special requirements such as high-altitude aerodynamic performance, high temperature resistance, and high strength.

Select the right materials: Common materials used for precision metal fan blades are aluminum alloy, titanium alloy, stainless steel, etc. The materials should be selected according to the use scenario and performance requirements of the blades, and the mechanical properties, corrosion resistance, and machinability of the materials should be considered.

Formulate the processing process plan: according to the design of the blade and the characteristics of the material, formulate the detailed processing process flow, including the processing sequence, the equipment and tools used, and the processing parameters.

2. Raw material preparation:

Procurement of raw materials: according to the design requirements to purchase metal raw materials that meet the quality standards, to ensure that the composition, performance and other indicators of the material meet the processing needs of the blade.

Material inspection: Strict inspection of the purchased raw materials, including chemical composition analysis, mechanical properties testing, metallographic structure inspection, etc., to ensure the reliable quality of materials.

Material pretreatment: According to the need, the raw materials are cut, forging, rolling and other pretreatment, so that it can reach the preliminary shape and size requirements for subsequent processing.

3. Processing and forming:

Cutting: The use of CNC machine tools, milling machines, drilling machines and other equipment for cutting processing, remove excess materials, so that the shape and size of the blade gradually close to the design requirements. In the cutting process, it is necessary to select the appropriate tool, cutting speed, feed and other parameters to ensure the machining accuracy and surface quality.

Stamping: For some metal fan blades with relatively simple shapes and large batches, stamping can be used. By designing and making a suitable stamping die, the metal sheet is stamped into the shape of the blade under the action of the punching machine.

Forging process: forging can improve the internal organization of metal materials, improve the strength and toughness of materials. For some precision metal fan blades with high performance requirements, forging can be used for initial molding, and then subsequent processing.

Special processing: For some blades with complex shapes or special requirements, special processing methods may be required, such as electric discharge machining, electrolytic machining, laser processing, etc. These processing methods can be processed without touching the workpiece, and can process high-precision and difficult shapes.

4. Surface treatment:

Polishing: The surface of the blade is polished to improve the surface finish, reduce surface roughness, reduce air resistance and wear. Polishing can be mechanical polishing, chemical polishing, electrolytic polishing and other methods.

Coating treatment: According to needs, the surface of the blade is coated with a special coating, such as anti-corrosion coating, wear-resistant coating, heat insulation coating, etc., to improve the performance and service life of the blade.

5. Quality inspection:

Dimensional accuracy detection: Use measuring tools, coordinate measuring instruments and other equipment to accurately measure the size of the blade to ensure that the size deviation of the blade is within the design requirements.

Surface quality detection: The surface quality of the blade is detected by naked eye observation, microscope inspection and other methods to check whether there are scratches, pits, cracks and other defects on the surface.

Mechanical properties testing: tensile test, bending test, impact test and other mechanical properties of the blade are tested to ensure that the strength, toughness and other mechanical properties of the blade meet the requirements.

6. Assembly and commissioning:

Blade assembly: Assemble the processed blade with other parts of the fan to ensure that the installation position of the blade is accurate and firm.

Debugging and testing: debugging and testing the assembled fan to check whether the fan runs smoothly, whether the noise meets the requirements, and whether the air volume reaches the design index. If problems are found, make adjustments and improvements in time.