DONGBEN WORKHOLDING
What actually happens in the shop
A fixture is only as good as the last grinding operation and the inspection that follows it. This page lists the equipment and the sequence, so you can judge whether the tolerance on the drawing is achievable here.
Machining
- 3-axis and 4-axis vertical machining centres for bodies, plates and jaws
- Horizontal boring for tombstone faces and large housing fixtures
- Turning up to Ø500 × 1,000 mm for mandrels, flanges and adaptors
- Wire EDM for split collets, thin slots and hardened details
Thermal and stress treatment
- Stress relief of weldments before final machining, so the fixture does not move after six months
- Hardening of jaws, collets and wear parts to HRC 50–62
- Blackening and zinc plating for non-working surfaces
Grinding and fitting
- Surface grinding of datum faces, up to 1,500 mm
- Cylindrical grinding of mandrel lands and spigots
- Hand fitting and scraping where a ground joint is not enough
Inspection
- CMM with 0.001 mm resolution for geometry reports
- Granite plate, height gauge and dial indicators for runout and parallelism
- Hydraulic pressure test at 1.5× working pressure, logged
- Trial cut on a machine of the same configuration wherever possible
Assembly and test
- Clamping force measured per station, not assumed from the cylinder bore
- Sequence valve setting recorded on the hydraulic schematic
- Trial-cut video and first-article report shipped with the fixture
Capacity and lead times
| Employees | 13, of which 3 in design and programming |
|---|---|
| Production lines | 3 — machining, assembly, inspection |
| Annual output | About 2,000 fixture sets and workholding units |
| Typical load | 6–10 fixtures in process at any time |
What we do not do
- We do not press carbide. Inserts are sourced and stocked, not manufactured here.
- We do not build fixtures for parts above roughly 400 kg without a specific engineering review.
- We do not sell used or rebadged fixtures.
- We do not quote a fixed price before seeing the drawing — the published band is a band, not an offer.
Send a drawing and get a number
3D model, machine table drawing, the operations and the annual volume — that is enough for a quote within one working day.