Stage 04 of 10 — In-house
Sheet Metal
Bending & Forming
Our sheet metal bending services run on twelve CNC press brakes at 100 tons, forming material from 0.2 mm to 22 mm at lengths to 3,200 mm. Angle held to ±0.5°; flange length to ±0.2 mm under 100 mm. The tolerance schedule is published below in full — including where it widens.
In-house production sequence — all ten stages under one roof
Signature specification
Sheet metal bending services — the tolerance schedule
Most fabricators publish one tolerance figure. A single figure is either optimistic at long flange lengths or needlessly tight at short ones. Ours is banded, because that is how the physics actually behaves.
Why it widens
Positioning error and material springback both scale with distance from the bend line. A 60 mm flange and a 900 mm flange do not behave the same way on the same machine, with the same tooling, in the same material.
Specifying ±0.2 mm on a 900 mm flange adds cost without adding function. If your design genuinely needs it, say so at quotation and we will discuss tooling and staging options rather than quietly quoting to the standard band.
Springback differs by material
Stainless steel springs back more than mild steel at equal thickness. Aluminium behaves differently again, and temper matters as much as alloy. Our press brake programmes compensate per material — which is why we ask for material specification alongside geometry when quoting, not as an afterthought.
| Parameter | Specification |
|---|---|
| Machines | 12 × CNC press brake |
| Press capacity | 100 T |
| Max bending length | 3,200 mm |
| Material thickness | 0.2 – 22.0 mm |
| Machining accuracy | 0.1 mm |
| Angular tolerance | ±0.5° |
| Minimum order | 100 pieces |
Sequence
Bend allowance is designed in, not corrected out
Our sheet metal bending services sit at stage four of ten in our custom sheet metal fabrication programme, after laser cutting and CNC punching. Because cutting and forming happen in the same building under the same production plan, blank dimensions are adjusted for bend allowance before the sheet is cut.
Parts do not leave our control between stages. A formed part goes straight to welding, then finishing, then assembly — no transit, no third-party scheduling, no handoff where accountability blurs.
Typical formed parts
- Equipment enclosures & housings
- Electrical cabinets and racks
- Kiosk and terminal bodies
- Chassis and mounting panels
- Brackets and structural frames
- Vending machine cabinets
Credentials
Certified, audited, documented
Quality management is certified to ISO 9001:2015 and audited by SGS. Products are certified to CE, RoHS, UL, ETL, FCC and KC standards for the markets we ship to. Every job runs under three-stage inspection — incoming material, in-process, and final — at 100% inspection coverage with a 99.5% first-pass yield.
Dongji holds 166 registered intellectual property assets: 93 utility model patents, 23 design patents, 26 software copyrights and 24 trademarks.
- ISO 9001:2015
- CE
- SGS audited
- RoHS
- UL
- ETL
- FCC
- KC
- High-Tech Enterprise
Questions
Before you send drawings
What tolerance can you hold on a bent part?
±0.5° on angle. On flange length: ±0.2 mm up to 100 mm, ±0.3 mm from 100 to 300 mm, and ±0.5 mm from 300 to 1,000 mm. These are finished-part figures, not machine specifications.
What is the longest part you can bend?
3,200 mm, on any of twelve 100-ton CNC press brakes.
What thickness can you form?
0.2 mm to 22.0 mm, in mild steel, stainless, galvanised steel, aluminium and copper.
Can you bend and weld the same part?
Yes. Cutting, punching, bending, welding, finishing and assembly all run in this facility across ten documented stages.
What do you need from me to quote?
Geometry, material, thickness and finish. With those four, a quote comes back within 24 hours. Without material specified we have to ask, because springback compensation depends on it.
Next step
Tight tolerance? Tell us at quotation.
Send geometry, material, thickness and finish. Quote back within 24 hours — with the achievable tolerance stated, not assumed.
Request a quote