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کشش عمیق · پرسکاری فلزات · ماشین‌کاری CNC · بدنه شیر برقی · قطعات فلزی رباتیک و پهپاد · آماده PPAP
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پاسخ‌های فنیEmail: shawn@balford.net

Free Engineering Tool

Tube Bending Unfold Calculator

Calculate the developed length of round and square tube after bending with centerline radius and bend angle inputs. Supports multi-bend sequences, material K-factors, minimum radius and thin-wall warnings.

1 · Tube Profile & Material
2 · Tube Dimensions
mm
mm
3 · Bend Sequence (straights & bends in order)
Segment 1 …Straight
mm
Segment 2 …Bend
°
mm
Segment 3 …Straight
mm
Total Developed Length
318.44 mmσ net straights + σ bend allowances
σ Bend Allowance120.84 mmσ θ × (R + K·T)
σ Net Straights197.6 mmL −tangent offsets
OD / T ratio15.4:1round >25 / square >20 warns

All bends within recommended radius limits for this material.

Bend allowance uses the neutral-axis method BA = θ × (R + K×T). Tangent offsets R × tan(θ/2) are removed from adjacent straights. Confirm with a trial bend …"springback and mandrel choice affect the final result.

Need a production quote for your metal parts?

Send your drawing to shawn@balford.net — our engineers will confirm material grade, gross weight, machining and pricing within 24 hours.