TD-31040 Pipe End Closing Machine | Tube Spinning & Roll Closing, Hydraulic 3-Station

What the machine does

TD-31040 roll-spins the open end of a metal tube at room temperature into one of three results:

1. Fully closed: a sealed dome end.
2. Dome with center hole: the hole diameter is adjusted independently, for a piston rod, screw or fitting.
3. Adjustable dome radius (set on the machine, no mold change): the curvature of the closed end is set to the product drawing.

How it works

The tube is held in a hydraulic rotating chuck and spun at high speed while hydraulic cylinders feed forming rollers that progressively close the end toward the center. The process is cold forming: no heat-affected zone, and the wall thickens naturally at the closure, so the end is stronger than a welded cap or a plastic plug.

Tube range

Machine specification

Compared with other methods

More capabilities

• Three stations, same or different sizes: run one tooling size on all three stations for volume, or a different size on each (e.g. Ø15 and Ø28 on the same machine at the same time) for mixed production.
• Adjustable end shape: closed or with a hole, hole size, center flat area and dome radius all set to the drawing.
• Special tubes: symmetrical square tube, tapered tube, long tube (with tube support) and short tube (with a support mandrel).
• Further processing: weld an eye, fitting or bracket onto the closed end.
• Larger OD in stages: tubes over 32 mm OD may be formed in 2–3 passes depending on material.
• Long machine life, low tooling wear: cold forming, no heat, clean finish.

Company history

Founded in 1989 to build hydraulic tube end closing and tube end forming machines; OEM department added in 1993 for metal and tube parts; TONG DA holds patents in several countries, and its machines are CE certified; robotic and automatic feeding introduced in 2015.

Also known as

Tube end closing machine, tube sealing machine, pipe end closing machine, roll closing machine, tube spinning machine, end forming machine, gas spring cylinder closing machine.

Applications

Gas spring and tailgate strut cylinders, shock absorber tubes, stabilizer bars, heat pipes and heat exchanger tubes, furniture and chair tubing, stroller frames, wheelchairs, crutches, telescopic poles, fitness equipment, lighting and sanitary hardware. See the gas spring, heat exchanger and furniture application pages for details.

Machine builder and tube processing contractor

TONG DA has built tube closing machines in Tainan, Taiwan since 1989, with machines sold to the USA, Germany, Turkey, the UK, India, China and other countries, and also runs them in-house for contract tube end closing. Send sample tubes for a trial closing before deciding between buying a machine and subcontracting.

Each station works independently

Every station is an independent unit. Run the same size on all stations for volume production (for example three stations on one size), or a different size on each station (three stations, three sizes) for small mixed lots. The dome radius and the hole diameter are adjusted separately on each station.

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.

Related: Gas spring production line · Outdoor, rattan & aluminium furniture · Spare parts: jaws, guide tubes, chucks

Other names by market

USA / UK / India: tube end closing machine, tube closing machine, pipe end closing machine, tube sealing machine, pipe sealing machine, tube end sealing machine, roll closing machine, roll closure machine, tube spinning machine, spin closing machine. Turkey: boru ucu kapama makinesi, boru kapatma makinesi, boru ağzı kapama makinesi, boru sıvama makinesi. Brazil: máquina de fechamento de tubos, máquina de fechar ponta de tubo, máquina de repuxo de tubos, repuxadeira de tubos. Spain / Mexico: máquina cerradora de tubos, máquina de cierre de tubos, máquina de repulsado de tubos. China: 封口机、管端封口机、旋压封口机、热旋压封口机、旋压机. Taiwan: 封管機、封口機、金屬封管機、管端封口機、管端成型機.

FAQ

Can it close stainless steel tube?
Yes. Stainless, copper, aluminum and carbon steel all work within the wall thickness table; welded tube needs a sound seam.

How many tube sizes can one machine run?
Any OD from 10 to 40 mm by changing the jaw set and guide tube; one set per OD. The dome radius is adjusted on the machine, with no mold change.

Can it leave a center hole?
Yes. The hole diameter is adjusted independently of the dome radius; proximity-switch positioning keeps the hole size consistent.

Square tube?
Square tube has been closed on this machine; send a drawing for evaluation.

Larger than Ø40 mm?
TD-31050 and the 70-type chuck models cover larger tubes; contact us with your specification.

Capacity, lead time and price?
Email sales@tdco.com.tw with tube OD × wall × material × length, the closed-end drawing and expected quantity; we reply with full details and arrange a trial closing.

＊Tubes must have enough ductility.

＊Because it is a cold forming process, the tolerance will be unstable due to the factors of the pipe, and the tolerance of the incoming material will affect the overall tolerance. The tolerance of the incoming material must be as small as possible.

＊Sealing machine to process tube weld bead have to firm, when sealed weld bead will not dehiscence.

＊Outside dia less than 20mm, within length 1000mm can to install tube holder keep tube don't shake (need extra purchase).

＊Stainless steel tube hardness is softer the better and good ductility, tube material weld bead have to firm.

＊Tube outside dia and thickness have to collocation each other. Especially outside dia more than 25mm tube.

Patent Information:

Safety certification:

CE MARK

Partner company:

Sold to Germany gas spring factory , European, USA company,  China, Thailand, Japanese car companies