Have Any Questions?
Automotive
Automotive parts made on TONG DA machines
| Part | Tube operations | TONG DA machines |
|---|---|---|
| Tailgate and hood gas springs | Cylinder closing, inner grooving, external grooving, pressing and edge folding, lock nut | TD-31040, TD-627, TD-42815, TD-AT155, TD-91528 |
| Shock absorbers, dampers | Cylinder closing, inner grooving | TD-31050, TD-31040, TD-627 |
| Torsion beams, torsion bars, stabilizer bars | Large-diameter heavy-wall end closing and forming | TD-382 NC servo |
| Seat frames, headrest rods | End closing, grooving, beading | TD-31040, TD-41335 |
| Fuel and airbag tubes | End closing, center hole | TD-31040 |
Why automotive suppliers use cold roll closing
Cold roll closing forms the tube end in one piece with no weld seam and no heat-affected zone; the wall thickens at the closure, so pressure and fatigue strength exceed a welded cap. One operation, no filler, no grinding. End shape (dome, flat, center hole) is set by tooling or program, so batches are consistent.
 TD-382 NC servo closing machine |  Shock absorber tube ends, closed and with hole |  Stabilizer bar tube end closing |
Track record
TONG DA closing and grooving machines have supplied gas spring, shock absorber and chassis parts makers since 1989; machines sold to the USA, Germany, Turkey, the UK, India, China and Japan, CE certified.
How to start
Send the part drawing, tube OD × wall × material and annual volume; TONG DA recommends machines and line layout and makes samples.
Related videos
 Hollow Stabilizer Bar End Closing – Programmable Dome on Heavy Wall |  TD-31050 Thick-Wall Shock Absorber Tube Closing OD40×2.5t |  Servo CNC Gas Spring Damping Groove (Inner Grooving) Machine |
More machine videos on our YouTube channel: youtube.com/@closingmachine
