The performance and reliability of a portable diesel generator largely depend on the rigor and advancement of its molding process. The molding process encompasses the entire process from raw material processing to component assembly, determining both the overall structural strength and lightweight level of the generator, as well as its environmental resistance and service life.
In the molding of metal structural components, the choice of steel or aluminum alloy determines the difference in processing paths. Steel frames and shells are generally cut using laser cutting or plasma cutting to ensure dimensional accuracy and cut quality; subsequently, they are CNC bent and shaped, and then welded to complete the main assembly. Welds require stress-relief annealing and surface anti-corrosion spraying to improve overall rigidity and corrosion resistance. Aluminum alloy components are often formed using die casting or profile extrusion. Die casting allows for one-time forming of complex shapes, reducing subsequent machining and achieving high dimensional consistency; extruded profiles are mostly used for heat dissipation structures and frame beams, and undergo age hardening treatment after forming to balance lightweight and high strength.
The molding of core engine components is particularly critical. The cylinder block and cylinder head are mostly manufactured using sand casting or precision casting to ensure the uniformity of internal flow channels and wall thickness. The cast blanks must undergo aging treatment to eliminate internal stress, followed by high-precision machining through CNC milling, boring, and honing to ensure sealing and thermal expansion matching performance. Load-bearing components such as the crankshaft and camshaft are often formed by die forging. The forging process refines the grains and ensures continuous fiber distribution, improving fatigue strength. They are then heat-treated and precision ground to achieve the required dimensional and positional tolerances.
The stator and rotor cores of the generator are made by stamping and stacking high-permeability silicon steel sheets. The precision of the stamping die directly determines magnetic circuit loss and electromagnetic performance. The windings employ automated winding and vacuum impregnation processes to enhance insulation reliability and heat resistance. Plastic parts, such as the control panel housing, are mostly injection molded. By optimizing the mold flow channels and cooling system, it is ensured that the molded parts are free of shrinkage marks and warping, and meet flame retardant and weather resistance requirements.
The assembly process emphasizes modularity and vibration-damping layout, utilizing positioning fixtures and torque control wrenches to ensure coaxiality and consistent tightening force of all components, thereby reducing operational vibration and noise. Overall, the manufacturing process of the portable diesel generator integrates precision machining, advanced materials, and rigorous quality control, forming a solid foundation for stable power supply under complex operating conditions.