What is the reason for the cracking of the NGW102-35.5 planetary gear reducer base

The core reason for the cracking of the NGW102-35.5 planetary gearbox base is that the stress borne by the base exceeds the allowable strength of the material, which is caused by the superposition of multiple factors.
Core cause analysis

Design and material defects: Insufficient wall thickness design of the machine base, internal defects such as sand holes/pores in the castings, or material tensile strength not meeting standards, which reduces the structural load-bearing capacity.

Installation and assembly issues: uneven installation surface, uneven or overly tight anchor bolts, resulting in additional prestress on the machine base; The coaxiality deviation of the input/output shaft is too large, causing additional radial force during operation.

Abnormal working conditions and loads: Long term overload operation, frequent start stop or impact loads cause the machine base to repeatedly withstand alternating stresses, leading to fatigue cracking; Excessive equipment vibration exacerbates stress concentration on the machine base.

Manufacturing and processing errors: Insufficient aging treatment after casting the machine base, resulting in residual internal stress; The machining accuracy of key mating surfaces is insufficient, resulting in local stress concentration after assembly.

Suggested investigation direction

Firstly, check the location of the machine base cracking (mostly in stress concentration areas such as around the bearing seat and near the anchor bolt holes), and determine whether it is fatigue cracking or instantaneous overload cracking based on the defect morphology.

Verify whether the installation accuracy and load conditions meet the equipment requirements, and check the material quality assurance certificate and manufacturing process records to eliminate design and production level issues.