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Thread rolling die - grinding threads

Grinding & Cutting thread rolling dies


Grinding & Cutting thread rolling dies


There are 2 producion methods of producing the proflie of thread rolling dies:

  • Cutting method:is the traditional way for producing the thread shape of thread rolling dies, the threads are cut by the lathe machine.The thread shapes are with flat tip and flat root
  • Grinding method: is the newly way of producing the thread shape of thread rolling dies, the threads are ground by the thread grinding machines, teh trhead shapes are with round tip and round root.

Why we choose the grinding method for UNIFY thread rolling dies, please check the above for the reason.

Currently, we have more then 10 units of REISHAUER thread grinding machines (Swiss made) in our factory.The thread rolling dies offered by UNIFY are always the grinding type.The higher level quality can be ensured!


Why Grinding method is better:

Items The cutting method the grinding method
"R" shape (ISO standard for tip and root)
The precision of thread rolling dies
The surface of thread rolling dies (smooth)
Burr *
Die life
Die cost *
Tensile strength

Thru feed & In-feed (Die-01-01)


Thru feed & In-feed

In feed (Plunge) thread rolling dies:

  • There are multiple starts (helix angle) at the edge of thread rolling dies.
  • The type of thread rolling dies are sutiable to thread rolling of shorter length.
  • the thread rolling progress as:
    Place a work piece in between of thread rolling dies, the screws are formed by strongly pressing progress, when the right thread rollign die returns, take out the work piece. (the work piece stays at the same rollng point).

Thru feed thread rolling dies:

  • The threads are as the rings on the surface of thread rolling dies.
  • The type of thread rolling dies are sutiable to thread rolling longer length of screws. (longer then the length of thread rolling dies)
  • The threading progress as:
    Set the helix angle with the roller shafts of thread rolling machines first, and insert the thread rolling dies.
    1.Place a work piece in between of thread rolling dies, make sure the work piece is clamped by thread rolling dies.
    2.The work piece is moving ahead during the thread rolling progress.
    3.The screw shape is forming gradually at the end part of thread rolling dies
    4.Take out the work piece when the screw shape is well formed.
  • There are 4 different types of thru feed as:
    1.Annular ring type
    2.Continuous rolling type
    3.Helical slow feed type
    4.Speed-up type
    ->Choose the most sutiable one for your work piece, or we can suggest you for the case as long as we have your work piece for the study in ahead!

Specification Table:

Manufacturing thread rolling die range:

Outside diameter Max 300mm Pitch: 0.4 ~ 10.0P (60 ~2 1/2 TPI)
LENGTH MAX 400mm Module 0.2 ~ 2.0
Pressure Angle 10 ~45 degrees Helix Angle +/- 40 degrees


THREAD ROLLING DIE - grinding type (Die-01)



The superior tool steel is a very important element of thread rolling dies. SKD11 (JIS) and 1.2379 (DIN) are the named raw material which we have chosen for the past years.The blank of thread rollingd ies are heat treated by Japanese TECHNO vaccum & oil quenching furnace by heat treating dep. (TOYOGEN INDUSTRIAL CO.,)It will render the higher rigidity and higher wear-resistance of thread rolling dies.

After the heat tratment progress, the thread rolling dies are ground by Swiss REISHAUER thread grinding machines.And another progress of tempering to reduce the grinding stress is necessary for thread rolling dies.The thread rolling dies are ready for sale after the quality exam.The good quality of thread rolling dies is able to offer higher precision, longer working life, and reduced the cost to customers.

We also produce the thread rollingd ies for other brands thread rolling machines. Your special specifications and requirements are very welcomed.