TD-382 NC Servo Closing Machine for Hollow Stabilizer Bars | Also Closes Large Shock Absorber Cylinders
Why a hollow stabilizer bar must be closed
To cut vehicle weight, stabilizer bars (anti-roll bars) are moving from solid bar to hollow steel tube. Once the bar is hollow, the tube ends must be closed to keep water and dirt out, prevent internal rust and keep the end stiff. Stabilizer bars use large-diameter, heavy-wall tube that a standard hydraulic closing machine often cannot handle, and that is the job of the TD-382.
 TD-382 NC servo closing machine |  Stabilizer bar tube end closing |  Stabilizer bar before and after closing |
How the TD-382 closes a stabilizer bar
- The tube spins in a hydraulic rotary chuck while servo X and Y axes drive the forming roller along a programmed path, closing the end in stages.
- The dome radius is set freely in the program. Each car model has its own program, with no mold change.
- Cold spin closing: no heating, no oxide scale, material properties unchanged, no weld seam or heat-affected zone.
- Feed and speed are set stage by stage, so heavy-wall tube closes steadily.
- The closed end is one piece with the tube and can be leak tested (see the videos below).
One machine for stabilizer bars and large shock absorber cylinders
| Part | End form | Notes |
|---|---|---|
| Hollow stabilizer bars, torsion bars, torsion beams | Fully closed dome | Radius set in the program; call a program per model |
| Large shock absorber cylinders | Center hole or flat end | Hole diameter and flat size set in the program |
Change product by calling a program; change tube size by swapping the jaw set and guide tube. One TD-382 can serve both a stabilizer bar line and a shock absorber line.
Range
| Item | Specification |
|---|---|
| Tube OD | Large-diameter heavy-wall tube, up to Ø70 mm (depending on the end form) |
| Material | Carbon steel, alloy steel, stainless steel; the material must be ductile |
| Forming drive | Servo X and Y axes |
| Control | Mitsubishi servo and PLC with touch screen; product programs stored and recalled |
| Power | 220–415 V, 3-phase |
| Certification | CE |
Track record
The TD-382 is used in a Japanese automotive parts supply chain for volume production of stabilizer bar tube ends, running in plants in Japan, Thailand and China. TONG DA supplies jaw sets, guide tubes and related spares long term.
Customer track record
Since 1989, TONG DA closing machines have been shipped to gas spring and shock absorber manufacturers in Korea, the USA, Germany, Turkey, the UK, India and mainland China, with ongoing supply of jaw sets, guide tubes and hydraulic chucks. The machines are built to last: many have been running on customers’ production lines for more than 20 years and are still in stable production today.
TD-382 or the TD-31050 hydraulic machine?
For tube OD within Ø50, a fixed end shape and high volume, the TD-31050 stabilizer bar closing machine is enough. For larger diameters, heavier walls, tight radius requirements or many car models, choose the TD-382.
Related videos
 Hollow Stabilizer Bar End Closing – Programmable Dome on Heavy Wall |  Stabilizer Bar / Torsion Beam Tube End Closing – NC Servo |  Stabilizer Bar Closed End Leak Test – Gas-Tight, Weld-Free |
More machine videos on our YouTube channel: youtube.com/@closingmachine
FAQ
Does a new car model need new tooling?
No. The dome radius is set by the servo X/Y program, so a new model is a new program. Only a change of tube size needs a new jaw set and guide tube.
Is the closed end gas-tight?
The end is formed in one piece with no weld seam and can be used where gas-tightness is required; a leak test is shown in the videos. Acceptance criteria follow the customer’s specification.
Can you trial-close our samples?
Yes. Send tube OD × wall × material × length and the end drawing; we close the samples and send them back.
How do we get a quote?
Email sales@tdco.com.tw with the tube specification, end drawing and expected volume.
