The SUNTECHMACH STB76 is a powered section and tube rolling machine built for fast, accurate large-radius bends and complete circles in round tubes, square tubes and flat sections. A 1.5kW motor at 1400 rpm drives two rollers with a third driven roller, and the top roll is adjusted by hand to set the bending radius. It forms thin-walled mild steel and stainless steel tube from Ø16mm up to Ø76mm round and 16mm to 50mm square, which makes it a practical machine for steel greenhouse frame production, railings, frames and general fabrication work.

Key Features

• 1. Wide Rolling Range: round tubes Ø16-76mm and square tubes 16-50mm, covering greenhouse arches, railings, frames and general fabrication work.
• 2. Three-Roller Powered System: two driving rollers and one driven roller, driven by a 1.5kW motor at 1400 rpm for smooth, continuous forming.
• 3. Manual Top-Roll Adjustment: the top roll is adjusted by hand to set the bending radius, so one machine can produce different radii as well as complete circles.
• 4. Combination Tooling (2-IN-1 / 3-IN-1): round-tube dies cover 16 / 19 / 22&63 / 25&51 / 32&38mm and square-tube dies cover 30&50 / 16&25&40 / 19&22&28mm, reducing the number of dies needed.
• 5. Grey Cast Iron Tooling: tooling made of grey cast iron gives long service life and stable forming.
• 6. Two Working Positions: the machine can be used on either side, front or rear - the front handles the larger tube while the rear is capable of rolling smaller tubes.
• 7. Built-In Safety: closed construction for added safety, with a foot pedal and emergency stop available on request.
• 8. Made for Greenhouse Frame Production: especially applicable to the production of steel greenhouse frames, and capable of rolling thin-walled mild steel and stainless steel round and square tubes.

Technical Specifications

How to Choose

Rolling Capacity - Round Tubes (max. wall thickness, mm)

Rolling Capacity - Square Tubes (max. wall thickness, mm)

What's Included

• 1x STB76 section & tube rolling machine
• 1x Set of round tube tooling - 16 / 19 / 22&63 / 25&51 / 32&38mm
• 1x Set of square tube tooling - 30&50 / 16&25&40 / 19&22&28mm
• 1x Foot pedal with emergency stop
• 1x Operation manual + warranty card

Applications

• Steel greenhouse frame arch production (the main application for this machine)
• Large-radius bends and complete circles in round tube, square tube and section
• Railings, gates and architectural metalwork
• Steel furniture frames and shop fittings
• Thin-walled stainless steel tube forming (0.5-2.0mm wall depending on diameter)
• Hoop, ring and arch forming for covers and canopies
• General fabrication, repair and tube processing workshops

Packaging & Quality Assurance

Packed in an export-grade wooden case. 73 x 63 x 103cm, gross weight 250kg

After-Sales Support

• 12-month warranty (excluding consumable tooling wear parts)
• Lifetime technical support by WhatsApp / Email
• Spare tooling and wear parts supplied for the STB series
• WhatsApp: +86-13777804353 ｜ Email: sales@cnsuntech.com

Operation Guide

1. Select the tooling set that matches the tube size and section type (round or square).
2. Fit the tooling onto the roller shafts and check that the dies are seated correctly and running true.
3. Loosen the top-roll adjustment and set the required bending radius by hand.
4. Turn the Forward-Pause-Back switch to the required direction and start the machine.
5. Feed the tube into the rollers, keeping it square to the rollers so the bend stays in one plane.
6. Roll the tube through in successive passes, closing the top roll a little each pass, until the required radius or a complete circle is reached.
7. Use the foot pedal with emergency stop (available on request) to pause or stop the machine quickly.
8. After rolling, switch off the machine, remove the tube and clean swarf from the rollers and tooling.

Common Faults & Solutions

FAQ

Q: What is a section and tube rolling machine used for?

A: It forms round tubes, square tubes and flat sections into large-radius bends or complete circles by passing them through three rollers. Typical work includes greenhouse frame arches, railings, frames and general fabrication.

Q: What tube sizes does STB76 roll?

A: Round tubes from Ø16mm to Ø76mm, and square tubes from 16mm to 50mm.

Q: What wall thickness can it roll?

A: For round tube the maximum wall is 0.5mm at Ø16mm rising to 2.0mm at Ø76mm in stainless steel, and 0.8mm at Ø16mm rising to 2.3mm at Ø76mm in mild steel. For square tube the maximum wall is 0.5-1.5mm in stainless steel and 0.8-1.8mm in mild steel across 16-50mm. 【待工厂确认】 - please check the figures against the factory chart before publishing.

Q: Can it make complete circles?

A: Yes. The machine is designed for large-radius bending and complete circles, including hoop and ring work.

Q: How is the bending radius adjusted?

A: The top roll is adjusted manually. The tube is passed through in successive passes and the top roll is closed a little each pass until the required radius is reached.

Q: Can it roll both round and square tube?

A: Yes. Dedicated round-tube and square-tube tooling sets are used, including 2-IN-1 and 3-IN-1 combination dies.

Q: What tooling is available?

A: Round-tube tooling: 16 / 19 / 22&63 (2-IN-1) / 25&51 (2-IN-1) / 32&38 (2-IN-1) mm. Square-tube tooling: 30&50 (2-IN-1) / 16&25&40 (3-IN-1) / 19&22&28 (3-IN-1) mm.

Q: What motor and voltage does it use?

A: 1.5kW at 1400 rpm, available in 220V or 380V.

Q: Does it come with a foot pedal?

A: A foot pedal with emergency stop is available on request.

Q: What material is the tooling made of?

A: Grey cast iron, which gives a long service life.

Q: What is the gross weight and packing size?

A: 250kg gross weight and 73 x 63 x 103cm packing size for the STB76.

Q: Can the machine be supplied with our own brand?

A: Yes. For bulk orders we can supply nameplates and customized packaging in your brand (OEM).