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3-Die Thread rolling machine

THREE DIES ROLLING Thread Rolling Machine


This machine is designed for the thread/profile forming on the thin pipes/tubes, which equipped with 3 same size rolling shafts and needs 3 pieces of rolling dies while rolling. These three shafts are swivel able to ensures optimum capacity and use in making threads and axially parallel profiles in the through-feed process. For this special through-feed process automatic feed of the work is necessary.
This machine can also be used in the in-feed process with parallel die axes, the length of the profile to be rolled depends on the width of the rolling dies, there is no axial movement of the workpiece.
Tapered pipe thread (PT, FT series) forming are most common applications by this machine.

3 roll Thread rolling machine PTR3-40 PTR3-80 PTR3-120
Max roll pressure 100kN 200KN 300KN
Max rolling diameter Φ9-40mm Φ20-Φ80mm Φ30-Φ120mm
Max diameter of rollers Φ78-90mm Φ100-Φ170mm Φ120-Φ210mm
Inner diameter of roller Φ25.4\Φ35 Φ54mm Φ75mm
Max thickness of rollers  20、40mm  100mm  Φ120mm
Axis tilt angle ±3° ±6° ±3°
Activities spindle feed rate 20mm/s 20mm/s 20mm/s
Workpiece thickness Less than 2mm Less than 2mm Less than 2mm
length unlimited Unlimited Unlimited
Hydraulic Power 1.5kw 4kw 3.175kw
Active Power 2,2kw 7.5kw 11kw-6
Cooling power 125W 125w 125w
Total mass 600kg 2500kg 3900kg±50kg
Dimensions 1200×850×1400mm 1750×1600×1900mm 2500×1500×2100mm


Superior quality of thread

Rolling process is recommended when threads are required with superior tensile, shear, and fatigue strength. Other processes like turning, milling and grinding remove material to produce the thread form, but thread rolling displaces the material with hardened steel dies. Rolling dies typically have a hardness between a range of RC 58-63 and there is a specific set of dies for each thread size and each thread form.  
  • Static tensile tests on parts formed through thread rolling show overall increases in strength of about 30 percent.
  • Fatigue strength is improved by 50-75 percent.
  • Tests on bolts first heat-treated to a hardness of 35-40 Rockwell C and subsequently rolled show even greater fatigue strength.

High benefits of Thread rolling process are:

✓ Lower costs
✓ Increased production
✓ Faster lead times
✓ Superior quality and accuracy:
 ○ Stronger threads
 ○ Improved finish
 ○ More accurate profile