A jig that deforms or wears out early ruins the parts it holds. Graphite fixtures handle heat and sliding where metal fails, but only when machined to the right specs. This article covers five specs that make a graphite fixture last.
Jiecheng Graphite (since 2003) machines graphite fixtures to spec, and confirms geometry in writing.
Five specs that make a jig last
Grade sets temperature and wear resistance. Flatness on the datum controls the part. Pocket design allows expansion. Wall thickness carries the load. And surface finish controls wear against the part.
· Grade — matched to temperature and wear
· Flatness — held on the datum
· Pocket — allows expansion
· Wall — sized to the load
· Finish — smooth against the part
Where graphite fixtures are used
Graphite fixtures hold, support and guide parts through high-temperature processes. Confirm the part, temperature and load before ordering.
· Sintering and hot-press jigs
· Brazing and soldering fixtures
· Furnace and heat-treat carriers
What to specify before you buy
Send the part, temperature, load and datum requirement. Jiecheng Graphite machines fixtures in its 3,000 m² Dalang plant and ships worldwide.
Spec | What to confirm | Why it matters |
Grade | Temp + wear | Sets life |
Flatness | Datum value | Controls part |
Pocket | Expansion gap | Allows growth |
Wall | Thickness | Carries load |
Finish | Ra value | Controls wear |
Buying checklist
1. Send part, temperature and load
2. Specify flatness on the datum
3. Confirm pocket and wall design
4. Agree grade and finish
5. Freeze the fixture spec
FAQ
Why does my jig deform?
Grade, wall or support; confirm the design.
What grade lasts longest?
A grade matched to temperature and wear; confirm the value.
How do I protect the part?
Hold flatness and a smooth finish on the contact face.
Confirming fixture performance
A fixture is judged in your furnace, not in the shop. Confirm the temperature, load and datum before machining, and check the first part in service. Jiecheng Graphite machines to your process data and documents the geometry, so the fixture performs as designed.
· Confirm temperature and load
· Check the datum and fit in service
· Keep the fixture spec on file
A long-lasting fixture comes from grade, flatness, pocket, wall and finish, all confirmed. Jiecheng Graphite has made fixtures since 2003 and keeps the spec on file.
