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How to Repair a Damaged End Face of a 177 Twin Screw Extruder Barrel? A Full Workflow and Inspection Guide

2025-04-10

Case Background: How to Deal with Extruder Barrel End Surface Damage?

A customer recently commissioned ZHITIAN to repair a 177 twin screw extruder barrel with end surface damage due to operational mishandling. The goal was to restore dimensional accuracy and sealing performance without replacing the entire unit.

Repair Procedure and Inspection Protocol

ZHITIAN carried out the following repair procedures in compliance with European standards:

Weld repair to restore the damaged sealing surface.
Leak testing to ensure no internal leakage.
Penetrant Testing (PT) to detect surface cracks or welding flaws.
3D CMM inspection to verify dimensional accuracy before and after repair.
Surface roughness measurement to ensure post-repair Ra ≤ 0.2 μm.

najnowsza sprawa firmy na temat How to Repair a Damaged End Face of a 177 Twin Screw Extruder Barrel? A Full Workflow and Inspection Guide 3

Post-Repair Inspection Results Summary

Item	Inspection Method	Post-Repair Result	Acceptance Criteria
Flatness	CMM Measurement	≤ 0.02 mm	≤ 0.03 mm
Parallelism	CMM Measurement	≤ 0.02 mm	≤ 0.03 mm
Overall Length	CMM Measurement	Within design tolerance	As per drawing
Pin Hole Perpendicularity	CMM	≤ 0.02 mm	≤ 0.03 mm
Weld Seam Quality	PT + Leak Testing	No cracks or leakage	No visible flaws
Surface Roughness	Roughness Tester	Ra ≤ 0.2 μm	Ra ≤ 0.4 μm

FAQ: Common Questions from European Buyers

What is the final precision after barrel repair?
We guarantee that flatness, parallelism, and hole positioning will be controlled within 0.02 mm. Surface finish is controlled at Ra ≤ 0.2 μm, suitable for critical sealing and alignment.

Why choose repair instead of replacement?
Repairing saves both time and cost while maintaining comparable performance. ZHITIAN verifies all key dimensions before and after to ensure full restoration.

Which brands can ZHITIAN service?
We support repair services for brands like Coperion, Leistritz, JSW, USEON, and other common European extruder systems.

Conclusion: Why Partner with ZHITIAN?

This case highlights ZHITIAN’s technical strength in restoring twin screw barrel integrity with complete dimensional and quality testing. By using German-equivalent materials and precision CNC finishing, we ensure your equipment continues to perform like new.

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How to Repair a Damaged End Face of a 177 Twin Screw Extruder Barrel? A Full Workflow and Inspection Guide

Case Background: How to Deal with Extruder Barrel End Surface Damage?

Repair Procedure and Inspection Protocol

Post-Repair Inspection Results Summary

FAQ: Common Questions from European Buyers

Conclusion: Why Partner with ZHITIAN?

twin screw barrel repair

extruder barrel maintenance

ZHITIAN

Ra roughness

welding NDT

PT test

CMM measurement

flatness correction

OEM repair

end-face restoration

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