Shock Absorber Manufacturing Machines | Cylinder Bottom Closing, Grooving, Valve Riveting and Piston Rod Preparation

Machines for shock absorber tubes and assemblies

Twin-tube and mono-tube shock absorbers, motorcycle and bicycle dampers, cab and seat dampers all start with a steel cylinder that has to be closed at the bottom, grooved, marked and assembled. TONG DA builds the tube machines for these steps and special purpose machines for valve assembly. Since 1989 our closing machines have been shipped to gas spring and shock absorber makers in Korea, the USA, Germany, Turkey, the UK, India and mainland China.

	Cylinder bottom closing TD-31050 shock absorber closing machine (two-station, OD 15–50 mm) cold-spins the tube bottom into a one-piece dome, fully closed or with a hole; no welded cap and no weld seam to leak.
	Large or thick-wall cylinders, programmable ends TD-382 NC servo closing machine for large shock absorber cylinders: the servo X and Y axes set the dome, flat bottom or hole from the program, so one machine runs several products.
	External grooves and beads TD-41335 hydraulic axial roll grooving machine rolls grooves and beads on shock absorber tubes without chips.
	Inner grooves For dampers that use a bypass groove inside the cylinder: TD-627 servo grooving machine or TD-61530 hydraulic grooving machine.
	Valve assembly (special purpose) Multi-station rebound valve nut tightening and riveting machines, and base valve spin riveting machines, built to your valve drawing (see videos).
	Piston rods Rod cutting, induction hardening, four-point welding and turning can be added through partner machines; ask when you send your drawings.

Why spin-close the cylinder bottom

• One piece with the tube: no welded cap, no weld seam, no leak path.
• Cold forming, no heat: no oxide scale and no change to the tube material.
• Dome radius and hole adjustable on the machine.

Videos

TD-31050 – OD44.45 shock absorber tube	TD-31050 – OD40×2.5 thick-wall tube	Automatic closing – OD55.1 shock absorber tube
Rebound valve nut tightening & riveting	Base valve spin riveting	TD-41335 – shock absorber tube grooving
Inner grooving – OD28×470 shock absorber tube	Roll marking on shock absorber tubes	Piston rod four-point welding

More videos: youtube.com/@closingmachine

FAQ

Can you close our cylinder before we buy?
Yes. Send tube OD × wall × length, material and the bottom drawing to sales@tdco.com.tw; we close samples and send photos and video.

Which machine for which size?
TD-31050 up to OD 50 mm; larger diameters, thicker walls or programmable shapes go to TD-382. Send the drawing and we recommend.

Spare jaws and guide tubes?
See spare parts.

Türkçe: amortisör üretim makineleri

TONG DA (Tayvan, 1989'dan beri) amortisör silindirleri için makineler üretir: silindir dibinin soğuk dönerek kapatılması (kaynaksız, tek parça), dış ve iç kanal açma, geri dönüş valfi somun sıkma ve perçinleme, taban valfi döner perçinleme özel makineleri. Kendi borunuzla numune: sales@tdco.com.tw.

Português: máquinas para amortecedores

Máquinas para cilindros de amortecedores: fechamento do fundo do cilindro por repuxo a frio (sem solda, peça única), ranhuras externas e internas, máquinas especiais para aperto e rebitagem da porca da válvula de retorno e rebitagem orbital da válvula de base. Amostras com o seu tubo: sales@tdco.com.tw.

Español: máquinas para amortiguadores

Máquinas para cilindros de amortiguadores: cierre del fondo del cilindro por rotación en frío (sin soldadura, una sola pieza), ranurado exterior e interior, máquinas especiales para apriete y remachado de la tuerca de la válvula de rebote y remachado orbital de la válvula de base. Muestras con su tubo: sales@tdco.com.tw.

Names used in different markets

English: shock absorber manufacturing machine, shock absorber tube closing machine, damper cylinder machine, shock absorber assembly machine. Turkish: amortisör üretim makinesi, amortisör boru kapama makinesi. Portuguese: máquina para amortecedores. Spanish: máquina para amortiguadores. Malay / Indonesian: mesin penyerap hentakan. Chinese: 减震器生产设备、减震器封底机、减震器铆合机、避震器設備。