Komatsu PC220 Excavator Link: Single-Piece Precision Milling Process

As a professional manufacturer of core transmission components for Komatsu PC220 excavators, we focus on ensuring the high-precision assembly and matching of Komatsu PC220 excavator link with crankshafts and piston pins. To achieve this, we adopt a specialized single-piece precision milling process, adhering to core principles of one-piece assembly, one-piece welding, and one-piece machining throughout production.

In the assembly and welding phase, we utilize custom-built special fixtures to enable precise one-piece assembly of the connecting rod body and cap for Komatsu PC220 excavator link. These fixtures lock part positions accurately via multi-point locating pins, ensuring the mating surface gap is ≤0.02mm. We employ pulse GTAW (gas tungsten arc welding) for the welding process, with each component undergoing independent welding. During welding, we monitor temperature field changes in real time to prevent dimensional deviations caused by welding stress concentration. Post-welding, we perform dedicated deburring on the bonding surface to guarantee assembly accuracy.

The machining phase strictly follows one-piece processing standards. For Komatsu PC220 excavator link, we take the big-end end face and small-end outer circle as precision references, using 5-axis CNC milling machines for single-piece precision milling. First, we rough-mill both end faces, leaving a 0.5mm allowance, then finish-mill to meet requirements of parallelism ≤0.02mm and surface roughness Ra1.6μm. We conduct symmetrical milling on the rod body's I-shaped cross-section, controlling machining deformation through a phased strategy: rough milling – stress relief – finish milling. Key big and small end hole machining adopts a progressive process: rough boring – semi-finish boring – finish boring – honing, with each part processed independently for hole system completion.最终, we control the hole diameter tolerance within ±0.01mm and the hole axis parallelism within ≤0.02mm, ensuring precise and consistent assembly dimensions for every connecting rod.

 

 

 

 

 

 

 

 

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