Hot Sale for Rear Leaf Spring Bushings - 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:
We provide fantastic energy in top quality and advancement,merchandising,gross sales and marketing and operation for Hot Sale for Rear Leaf Spring Bushings - China Manufacturer supply TRA-699 leaf spring for trailer – Jiachuang, The product will supply to all over the world, such as: Cairo, New Delhi, Hungary, We have more than 10 years experience of production and export business. We always develop and design kinds of novel products to meet the market demand and help the guests continuously by updating our products. We are specialized manufacturer and exporter in China. Wherever you are, please join us, and together we will shape a bright future in your business field!
By Genevieve from Bulgaria - 2017.03.28 16:34
We have been engaged in this industry for many years, we appreciate the work attitude and production capacity of the company, this is a reputable and professional manufacturer.
By Elvira from Egypt - 2018.06.21 17:11