200T H-Frame Servo Punch Press Main Motor Overheating and Vibration Fault

Case Study of 200T H-Frame Servo Punch Press Main Motor Overheating and Vibration Fault: Root Cause Analysis, On-site Repair Scheme and Preventive Maintenance Specification

1. Fault Background

A Jiangsu automotive stamping plant used a 200T H-frame servo punch press to produce heavy-duty vehicle structural brackets. The equipment ran 2 shifts daily. On the day of failure, operators observed obvious vibration and abnormal noise from the main motor. The temperature alarm popped up, and the press stopped automatically. The customer checked electrical cabinet and power supply but failed to locate the problem and requested official after-sales support.

2. Fault Diagnosis & Root Cause Analysis

1. Visual inspection: Cooling fan accumulated thick dust, fan blade edge wear;
2. Vibration detection: Coupling had 0.08mm offset due to loose bolts;
3. Thermal imaging test: Motor winding local temperature reached 94℃;
4. Cause conclusion: Compound fault of fan blockage + coupling misalignment. High continuous stamping load amplified vibration and heat generation.

3. Repair Implementation

1. Replace damaged cooling fan assembly and clean internal motor heat sink;
2. Re-align motor and gearbox coupling, fasten bolts with torque wrench;
3. Run dynamic balancing test;
4. Adjust the motor overload protection threshold and save optimized parameter set.

4. Comparison Data Table

Case Study Q&A