Lowest Price for HD72 leaf spring - China Manufacturer supply TRA-699 leaf spring for trailer – Jiachuang Detail:
This spring assy are widely used in American for trailer .
Spring Measurements Specs
Totally 4 blades , End to End Measurement 1110 mm (Free Length Measurement), Free Arch Measurement (see picture) 105mm,Tolerance range within ±3mm . Middle straight 203mm,4pcs middle pads 200*71*1*12.5(mm).
All datas are obtained by measuring the new produce product .
Semi-Trailer Tra699 Leaf Spring Are Made As Follows
Multi-leaf springs are made as follows:
1. Shearing of flatbar
2. Center holepunching / Drilling
3. End Heatingprocess forming (hot & cold process)
1. Eye Forming /Wrapper Forming
2. Diamond cutting/ end trimming / width cutting / end tapering
3. End punching /end grooving / end bending / end forging / eye grinding / end rolling
4. Center holepunching / Drilling / nibbing
4. Heat Treatment
1. Heating
2. Hardening
3. Cambering
4. Quenching
5. Tempering
5. Surfacepreparation
1. Shot peening /stress peening
2. Primary painting
6. Eye bushpreparation process
1. Eye reaming /eye boring
2. Bush insertion
3. Bush reaming
7. Assemble
1. Presetting &load testing
2. Finish painting
3. Marking &packing
Key Points Keep The High Quality
| 1) Raw matrail . |
| Thickness less than 20mm. we choose SUP9/55Cr3/SAE5160H as the product material |
| Thickness from 20-30mm. wE choose SUP11A/50CrVA |
| Thickness more than 30mm. We choose 51CrV4 as the raw material |
| Thickness more than 50mm. We choose 52CrMoV4 as the raw material |
| 2) Quchenging Process |
| We strickly controled the steel temeprure around 800 degree. |
| we swing the spring in the qenching oil among 10 seconds according to the spring thickness. |
| 3)Shot Peening. |
| Each assmembing spring set under stress peening . |
| Fatigue test can reach over 150000 cycus |
| 4) Painting |
| Each leaf under cataphoresis painting. |
| Salt spray testing reach 500hours |
Production Process
1.Material Cutting
4.Edge Cutting
7.Stress Peening
2.Punching
5.Quenching
8.Assembling
3.Eye Rolling
6.Tempering
9.Painting
FAQ
Q1: What type of leaf spring could you produce ?
A: We can produce most kinds of springs in the market. especially on the parabolic springs.
Q2: What material could you supply for leaf spring?
A: Our material grade should be SUP9/SUP9A /SUP11A/51CrV4 /52CrMoV4/ even 55Cr3 and SAE5160H as well .
Q3: How long will be your delivery time?
A: 20-40days. If material stock enough around 20days. if not,would be 40days
Q4: What payment terms are acceptable?
A: TT and LC at sight
Q5: What is the packing?
A: No fumigation wooden pallet . we also can pack according to whatever you request if reasonable.
Q6:How about the surface finishing ?
A : electrophoresis coating (black,red,gray,or as customer’s requests )
Product detail pictures:
Related Product Guide:
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By Atalanta from Ottawa - 2017.11.11 11:41
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By Moira from Lebanon - 2017.08.18 11:04