TD-382 NC Closing Machine for Large Shock Absorber Cylinders and Hydraulic Cylinder Tubes
Why big cylinders are hard to close
Shock absorber, hydraulic and pneumatic cylinders are larger and thicker than gas spring tubes, carry higher internal pressure, and rarely want a plain dome: some need a center hole for the rod, some a flat mounting face, some a flat ring around the hole for a seal. Hydraulic closing tooling gives one shape per set, and heavy wall closed in a single stroke tends to wrinkle or crack.
How the TD-382 does it
The forming rollers ride on X / Z servo slides; the closing path is split into stages with separate feed and speed, so heavy wall folds in layer by layer. Hole diameter, flat diameter and dome radius are program settings: a drawing change is a program change, with no wait for tooling. Cold forming, no weld seam, no heat-affected zone, thicker wall at the closure.
Typical end forms
| Part | End form |
|---|---|
| Large shock absorber and damper cylinders | Center hole with flat seal land |
| Hydraulic cylinder tubes | Flat heavy-wall end, screw positions available |
| Pneumatic cylinder tubes, air reservoirs | Pressure-tight dome |
| Industrial gas springs and buffers | Dome or center hole to design |
Tube materials
Carbon steel, alloy steel and stainless steel; large-diameter heavy-wall tube up to Ø70 mm, evaluated per end shape. Good ductility required; welded tube needs a sound seam.
How to check fit
Send cylinder OD × wall × material × length and the end drawing (hole, flat, radius); TONG DA trial-closes and returns samples before you decide between a machine and contract closing. Full machine details on the TD-382 main page.
FAQ
Can the hole diameter be changed?
Yes. It is a program parameter; the same rollers are used.
How many bore sizes on one machine?
Change the collet and jaw set for the bore; the end shape stays in the program.
Capacity, lead time and price?
Email sales@tdco.com.tw with the cylinder spec, end drawing and expected quantity.
