3 Inch Pipe Straightening Machine for ERW Tube Mill

Product Description

The 3 inch pipe straightening machine is designed for the finishing section of an ERW tube mill line, used to straighten welded steel pipes after forming and sizing.
By applying continuous multi-point roller straightening, the machine effectively corrects pipe bending, residual stress, and local deformation, ensuring the pipe straightness meets customer and international standards.

This model adopts a 7-roller straightening structure, driven by an AC motor through a transmission shaft.
It is suitable for carbon steel pipes up to 3 inches in diameter and can be equipped with Siemens or Inovance (Huichuan) frequency inverters according to customer requirements.

✅1. Technical Specifications

Working Principle

1. Pipe Feeding
   Welded and sized pipes enter the straightening machine smoothly from the finishing line.

2. Roller Drive
   The AC motor drives the transmission shaft, rotating all straightening rollers synchronously.

3. Multi-Roller Straightening
   Pipes pass through staggered upper and lower rollers, undergoing repeated micro-bending to remove curvature and internal stress.

4. Precise Adjustment
   Roller gaps are adjusted by a worm gear mechanism, allowing accurate control for different pipe diameters and straightness requirements.

5. Pipe Output
   Straightened pipes exit the machine and proceed to cutting, inspection, or packing.

Key Features

• 7-Roller Straightening Design
  Provides stable and uniform straightening for welded steel pipes.

• Reliable AC Motor Drive
  Ensures smooth operation and long-term reliability in continuous production.

• High-Precision Worm Gear Adjustment
  Easy to operate, stable positioning, and high adjustment accuracy.

• Variable Speed Control
  Optional Siemens or Inovance inverter for perfect speed matching with the ERW tube mill.

• Customizable Configuration
  Electrical components, motor power, and roller dimensions can be customized.

Applications

• ERW welded pipe production lines

• Structural steel pipes

• Construction and scaffolding pipes

• Furniture and general-purpose steel tubes

Frequently Asked Questions

Is this straightening machine suitable only for 3 inch pipes?

This model is designed for pipes up to 3 inches. Machines for larger pipe diameters can be customized.

What straightness accuracy can be achieved?

The machine meets standard straightness requirements for construction and structural pipes. Final accuracy depends on material and wall thickness.

What material are the straightening rollers made of?

All rollers are made of hardened alloy steel for excellent wear resistance and long service life.

Is the roller adjustment complicated?

No. The worm gear adjustment system is simple, stable, and easy for operators to use.

Can this machine be integrated into an existing ERW tube mill line?

Yes. It supports both online and offline installation and can be matched to existing production lines.

Why Choose This 3 Inch Pipe Straightening Machine

This ERW tube mill straightening machine combines stable performance, precise straightening, and flexible configuration.
It is an ideal solution for manufacturers seeking improved pipe quality and reliable finishing-line equipment.

1. Why Choose Us?

2. 1.Leading Technology, Reliable Quality, Excellent Service! Optimized Design, High quality material select!  Heat treatment process guarantee!

3. 2.Spiral bevel gear, drum gear coupling and carburization. Gear teeth quenching. Driven system stable, efficient and wearable with lower noise.

4. 3.High precision wear resisting and Long life of toolings. All the machine Lathes, Key Grooves are positioned and Milled by CNC.

5. 4.Quality department make sure the material of the raw materials quality, and ensure the machine running perfect.