Processing Machinery
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PA6 Office Chair Caster
Problem Phenomenon
The PA6 caster of the office chair cracks at the wheel axle under heavy load
Cause Analysis
The caster bears the seat load and rolling impact for a long time, the wheel axle hole wall undergoes compression creep, and stress concentration at the thin wall causes cracking; when troubleshooting on site, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
Strengthen the wall thickness at the wheel axle and add a metal bushing; select reinforced grades; conduct rolling durability tests according to standards such as BIFMA; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Key Takeaway
Casters undergo rolling durability tests according to furniture standards, and axle hole metallization is a reliable solution; after confirming effectiveness, fix the parameters and practices into the work instructions to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar problems in the future
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