Komatsu PC300 Excavator I-beam Excavator Connecting Rod

Precise Drawing Analysis and Process Planning​

High-Precision Blanking: Laser Cutting Technology​Q345B steel plates undergo blanking via laser cutting equipment. Laser cutting achieves an accuracy of ±0.1mm, enabling precise cutting of complex contours. This eliminates dimensional deviations and material waste associated with traditional cutting methods, while ensuring smooth, flat cut edges-laying a solid foundation for subsequent processing.​

Forming Processing: CNC Equipment Ensures Precision

CNC Press Brake Bending​

Cut steel plates undergo precise bending via a CNC press brake. Bending angles and pressure are regulated by computer programming, resulting in uniformly structured parts that meet all drawing specifications after forming.​

CNC Boring Machine Processing​

For the I-beam frame's assembly holes, a CNC boring machine performs boring operations. This controls the center-to-center hole deviation to ≤0.05mm, ensuring seamless assembly with subsequent components (e.g., pins, connecting rods) and preventing operational jamming caused by hole misalignment.​

Assembly Welding: Custom Tooling + Robotic Welding for Strength and Consistency​

Robotic Welding Operations​

Welding robots handle the welding process. Robotic welding offers high stability, uniform weld formation, and weld penetration that meets specifications. It effectively eliminates defects like skipped welds and cold welds, which are common in manual welding. Additionally, inert gas shielded arc welding (GMAW/MIG) reduces weld oxidation, enhances weld fatigue strength, and ensures both the welding strength and service life of the I-beam frame.​

Surface Treatment: Protective Coating for Enhanced Corrosion Resistance​

After welding, the workpiece surface undergoes pretreatment steps-including degreasing, derusting, and phosphating-to remove oil stains and oxide layers. A high-temperature bake-and-coat process is then applied, spraying anti-rust primer and wear-resistant topcoat to a total film thickness of 80–100μm. This effectively isolates moisture, dust, and corrosive media, boosting the I-beam frame's rust resistance and making it suitable for harsh outdoor working environments.tae vitae.