New energy vehicle fastener development process
Fastener development runs through the whole process of vehicle development, product pre-research, concept development, product development, product certification, trial production, and batch production.
Concept development: fastener alignment, fastener structure selection, fastener load evaluation, fastener quick calculation check, fastener assembly torque design
Product development: load determination, detailed calculation of fasteners, fastener selection, fastener development, fastener torque development
Product Certification: fastener size performance test, fastener clamping force test, key fastener road test torque and clamping force test
Pilot production: tool and range selection, tightening process settings, monitoring process settings, retest torque settings
Fastener design calculation
Detailed calculations are carried out in accordance with the VDI2230 standard:
1. Calculation of the clearance force 2. Calculation of the preload force loss 3. Design and calculation of the minimum preload force of the bolt connection 4. Bolt specification and performance level check 5, slip check 6, fatigue check 7, surface contact stress check 8. Matching nut performance level and internal thread engagement length check 9. Torque calculation when torque method is tightened 10, bolt length confirmation 11, surface treatment confirmation 12, anti-loose method confirmation 13, tightening method confirmation (torque method, corner method) 14. Confirmation of head form 15. Confirmation of assembly space.
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