Full-Cycle After-Sales Service Rectifies Overload Alarm & Clutch Slippage Fault

In the precision metal stamping sector, servo punch presses serving automotive structural parts and new energy component production lines are subject to extremely stringent requirements on load stability, clutch transmission consistency and continuous running reliability. Minor hidden defects of the clutch system will gradually deteriorate under cyclic impact load, trigger frequent overload alarms, bring about unstable product dimension tolerance and unexpected line stoppage, and cause measurable economic losses to batch production orders. Recently, our after-sales service hotline received an emergency service request from a new energy stamping manufacturer in Jiangsu Province. The customer’s 200T servo punch press, matched with HCK-800 three-in-one feeder, kept reporting overload alarms during the forming procedure of aluminum alloy battery brackets. The operator reported obvious clutch slippage when the press reached bottom dead center; stamping depth fluctuated randomly, finished workpiece bending dimension out-of-tolerance rate climbed sharply, and the automatic production line could not run continuously for more than 45 minutes before emergency shutdown. The customer was facing tight delivery schedules for overseas orders and urgently required rapid, standardized technical intervention to eliminate the fault root cause rather than merely clearing alarm codes for temporary resumption of production.

Upon receiving the service ticket, our after-sales department immediately activated the priority emergency response mechanism, which covers a complete set of standardized service measures for key customer projects. First, remote technical support engineers launched real-time online diagnosis within 15 minutes of ticket acceptance. They remotely connected to the press HMI, exported historical alarm logs, load curve data and servo drive operating parameters, guided on-site operators to carry out preliminary visual inspection of clutch air pressure pipeline, friction plate temperature and fastening bolts, and screened out invalid interference factors such as unstable incoming material thickness and feeder synchronization offset. Meanwhile, a certified senior field service engineer was dispatched with a full spare parts kit, precision torque wrench, infrared thermal imager, air pressure calibrator and friction coefficient test tooling; the engineer set off to the customer factory within 2 hours, and arrived at the workshop site within the promised 4-hour window. After on-site disassembly inspection, the service team confirmed the core problem: long-term high-frequency heavy-load stamping had caused uneven wear of the dry clutch friction plates, together with aging of the air cylinder sealing ring and loosening of the spline hub locking bolt. The combination of these defects reduced the friction transmission torque of the clutch, resulting in slippage under peak stamping load and continuous overload alarm feedback.

Our service team adopted a standardized layered repair scheme. The worn friction plates and aging sealing components were fully replaced with original factory certified spare parts; spline hub assembly was repositioned and fastened according to the factory torque specification; the clutch air supply circuit was purged, the pressure regulating valve was recalibrated, and the air filter and oil-water separator were replaced to prevent moisture and impurities from entering the pneumatic driving structure. After mechanical reassembly, engineers performed multi-stage commissioning: static air pressure holding test, no-load continuous jog test, low-load trial stamping, and full-load continuous running verification. All servo torque threshold parameters, clutch engagement delay and protection alarm values were re-optimized and written into the control system to match the customer’s battery bracket forming process. Beyond direct fault repair, our after-sales team delivered value-added supporting services. We trained the customer’s equipment maintenance team on clutch daily inspection points, standard air pressure checking frequency, abnormal temperature judgment method and correct alarm reset operation. A customized periodic maintenance plan was issued for this 200T servo press, and a dedicated service follow-up group was established to track equipment operating data for 30 days after repair.

After the whole service procedure, the 200T servo punch press passed 8 consecutive hours of full-load continuous stamping verification. Overload alarms and clutch slippage disappeared completely. The dimension pass rate of aluminum alloy battery bracket workpieces recovered from 72.3% before maintenance to 99.6%, and the effective production efficiency of the line rose by 27.8%. The customer’s delayed order schedule was effectively rescued. This case once again proves that our full-link after-sales system integrates rapid remote diagnosis, on-site emergency dispatch, original spare part guarantee, precision calibration, operator training and long-term follow-up monitoring, not only solving sudden breakdowns but also helping customers reduce recurring failure risks and stabilize the profitability of stamping production lines.

Q1: Why does clutch slippage mainly trigger overload alarm instead of direct stop immediately? A1: The servo drive collects real-time torque feedback. When the clutch slips, the servo motor keeps outputting torque to compensate the lost transmission force. Once torque exceeds the preset protection threshold, the system triggers overload alarm as a soft protection action rather than instant hard emergency stop.

Q2: Can we just increase air pressure temporarily to eliminate slippage without replacing friction plates? A2: Temporary pressure increase can lift friction torque for a short time, yet it will accelerate uneven wear of residual friction material, overheat the clutch hub and greatly raise the risk of sudden clutch failure during heavy stamping, which is an unsafe makeshift operation and not allowed in our service specification.

Q3: What advantages do original friction plates have over generic replacement parts? A3: Original friction plates adopt customized high-temperature resistant composite material with stable friction coefficient under cyclic impact load, consistent thickness tolerance and matched thermal expansion performance. Generic parts often have unstable friction coefficient, which easily leads to repeated slippage or seizure.

Q4: What is included in your priority emergency after-sales commitment for key customers? A4: It includes 15-min remote response, 4-hour on-site arrival in designated service areas, original spare part supply, post-repair running verification, on-site maintenance skill training and 30-day free operation follow-up tracking.

Q5: How should the workshop operator judge early clutch wear signals before serious slippage appears? A5: Typical early signals include periodic torque fluctuation records on HMI, abnormal friction noise during clutch engagement, slow temperature rise of clutch housing and subtle scattering of workpiece size, which should trigger inspection before formal failure.

Q6: Will the adjusted clutch delay parameter affect the existing stamping die service life? A6: The parameter optimization is finished on the premise of matching the original press kinematic curve. It only optimizes the engagement buffer phase, avoiding rigid impact, so it helps reduce die impact load and prolong die service life properly.