Thread rolling machine for worm shaft manufacturing | Chipless cold forming

Two-Axis Thread Rolling Machine for Worm Machining: Precision, Efficiency & Cost Savings

Worms are essential components in gearboxes, speed reducers, automotive systems, elevators, and industrial automation equipment. Traditional worm processing methods like hobbing, turning, and milling often lead to low efficiency, high material waste, and inconsistent thread quality. For manufacturers seeking a stable, high-volume production solution, the two-axis thread rolling machine has become the preferred choice for worm machining.

What Is a Two-Axis Thread Rolling Machine?

A two-axis thread rolling machine uses two synchronized rolling dies to form external threads through cold plastic deformation. Unlike cutting processes, it does not remove material but displaces metal to create precise worm profiles. This forming method preserves the metal’s internal fiber structure, resulting in stronger and more wear-resistant worms.

The two-axis design is especially suitable for solid cylindrical worm blanks, offering high rigidity, stable operation, and easy adjustment. It is widely used for processing standard worms, involute worms, trapezoidal worms, and multi-start worms.

Technical parameter:

Z28-200 heavy model

Rolling thread range Diameter 80mm

Max thread pitch 8mm

Spindle angle ±10°

Max rolling pressure 300kn

Spindle RPM 22/28/35/45/56/70rpm

Roller size range

Outside diameter 220mm

Hole 75mm

Max width 150mm

Spindle drive power 11kw/6grade

Hydraulic transmission power 5.5kw

Cooling pump power 90w

Dimension 1950*1700*1550mm

Weight 2800kg

How Worm Machining Works with a Two-Axis Thread Rolling Machine

1. Blank Preparation

The worm blank is turned to a specified diameter, deburred, and prepared for rolling. Suitable materials include carbon steel, alloy steel, 40Cr, 42CrMo, stainless steel, and aluminum with good ductility.

2. Rolling Die Installation

Precision rolling dies are customized according to the worm’s module, pitch, helix angle, and tooth shape. The two dies are installed and adjusted to ensure concentricity and synchronization.

3. Cold Forming Process

The workpiece is fed between the two rotating rollers. Under controlled pressure, the metal flows plastically to form the worm thread. The machine supports both infeed rolling and throughfeed rolling for different worm lengths.

4. Automatic Discharge Inspection

Finished worms are automatically discharged. Common quality indicators include pitch accuracy, surface roughness, tooth profile consistency, and concentricity.

Key Advantages of Two-Axis Thread Rolling for Worms

1. Higher Strength  Longer Service Life

Cold rolling forms a continuous metal grain flow. Rolled worms have higher tensile strength, fatigue resistance, and wear resistance than cut worms. The surface is work-hardened, reducing the need for additional heat treatment.

2. Excellent Precision Surface Finish

Two-axis thread rolling machines achieve high dimensional stability and thread accuracy, often reaching ISO 6G or higher. The surface finish can reach Ra 0.8–3.2 μm, significantly reducing noise and friction in transmission systems.

3. Extremely High Production Efficiency

Rolling speed is 3–10 times faster than hobbing or turning. A single machine can produce hundreds of worms per hour, making it ideal for mass production.

4. Material Cost Savings

Since no chips are produced, material utilization can exceed 95%. Tool life is long, and labor costs are reduced with automated feeding systems.

5. Wide Applicability

The two-axis thread rolling machine can process various types of worms:

• Single-start and multi-start worms

• Involute worms

• Trapezoidal worms

• Modular worms

• Worm shafts for automobiles, robots, reducers, and lifts

Applications of Worms Produced by Two-Axis Rolling Machines

• Automotive: power steering, seat adjustment, window regulators

• Speed reducers gearboxes

• Elevator and lifting equipment

• Conveyor systems industrial robots

• Valve actuators small power tools

How to Choose a Two-Axis Thread Rolling Machine for Worms

• Processing diameter range

• Maximum rolling force

• Applicable module and pitch range

• Automatic feeding and unloading system

• Rolling die customization support

• Stability, spindle accuracy, and after-sales service

Conclusion

For modern manufacturing, the two-axis thread rolling machine represents the most efficient and economical way to produce high-quality worms. It combines high precision, high strength, low cost, and high efficiency, helping manufacturers improve product performance while reducing production costs.

If you are looking for a stable solution for mass worm production, the two-axis thread rolling machine is your best choice. And contact zhihaomachinery freely.

Email: sales@zhihaomachinery.com

Mob/whatsapp: +8615512868421