76mm Mandrel Tube Bender for Steel Processing

Overview of the 76mm Mandrel Tube Bender

This machine serves workshops that produce tubular components from carbon steel, stainless steel, and alloy steel. Its mandrel system supports the inner wall of the tube during bending, which reduces ovality and wrinkling on tight-radius work. The minimum bend radius is 30 mm and the maximum is 350 mm, covering most common tubular part geometries. The bending head rotates up to 190°, and the through-effective distance of 3000 mm allows long tube lengths to be fed through the machine.

Key Features of the GM-SB-76NCB Mandrel Tube Bender

Full-Hydraulic Drive and Clamping

All primary motions — clamping, pressure die, mandrel, and bend arm — are hydraulically actuated. The system motor is rated at 7.5 kW, the oil pump delivers 25 L, and maximum system pressure reaches 16 MPa. Hydraulic actuation provides consistent torque across the full bend arc, which helps maintain uniform wall thinning on thick-wall steel tubing.

Mandrel, Wiper Die, and Booster Push

The mandrel rod is paired with a wiper (crease-resistant) die and an assist-push mechanism. The mandrel follows the tube through the bend zone, the wiper die supports the outside radius, and the booster pushes material toward the bend point. Together these components reduce wrinkling, flattening, and cracks on tight-radius bends in thick-wall steel.

PLC Control with Encoder Feedback

Bend angle is controlled by a high-precision imported encoder and a PLC with a touch-screen or text interface. The encoder feeds the actual bend angle back to the controller, which corrects hydraulic drift and holds repeatability at ±0.10°. Bending speed is set at 30° per second. Operators can store bend programs and switch between tube diameters by changing the tooling set.

Technical Specifications for the 76mm Mandrel Tube Bender

The table below lists the machine parameters as supplied by the manufacturer.

Applications of the Mandrel Tube Bender for Steel Processing

The GM-SB-76NCB is used in the production of exhaust pipes, roll cages, furniture frames, scaffolding components, agricultural machinery tubes, and structural tubular parts. It bends both standard round profiles and selected non-round shapes when fitted with matched tooling. The 3000 mm through-effective distance supports long workpieces such as truck exhaust assemblies and handrail sections.

Quality Assurance and After-Sales Support for the 76mm Mandrel Tube Bender

The machine is manufactured under an ISO 9001 quality management system and is supplied with CE documentation. Each unit is tested under load before shipment. The manufacturer provides a 2-year warranty, spare-parts supply, and remote technical support. Installation guidance and operator training can be arranged on request.

FAQ About the 76mm Mandrel Tube Bender

What is the maximum bending capacity of the machine?

The maximum bending capacity is 76 mm outside diameter by 5 mm wall thickness for round steel tubing. Capacity varies with material yield strength and bend radius; thinner-wall or lower-strength tubes can be bent at larger diameters with appropriate tooling.

Which materials can the GM-SB-76NCB bend?

The machine is designed primarily for carbon steel, stainless steel, and alloy steel tubes. It can also process copper, aluminum, and other ductile metals when the tooling and mandrel are matched to the material.

What is the minimum bending radius?

The minimum bending radius is 30 mm, measured to the centerline of the tube, and the maximum is 350 mm. Tight-radius bends below approximately 1.5 times the tube diameter require the mandrel and wiper die to be engaged.

Does the machine include a mandrel?

Yes, the mandrel system, clamping die, guide die, anti-crease (wiper) die, and assist-push mechanism are included as standard. Tooling for specific tube diameters is ordered separately to match the production requirement.