Advantages of thread forming compared to cut threads:
- no chips are formed, complications with their jamming are eliminated
- higher surface quality on the walls of the
formed thread
- smooth thread, no cutting grooves on the thread surface
- uniform thread calibration
- uninterrupted material fibers by cutting
- increased strength of the screw connection
- greater tool resistance to breakage and thus longer tool life
- higher speeds during forming increase productivity
Conditions for using thread forming technology:
- compliance with the required diameter of the pre-drilling hole; a smaller hole can cause the tool to break, a larger hole means a small thread diameter that is not formed
- sufficient
lubrication; high friction occurs during forming, therefore the use of high-quality lubricating
oil is recommended
- sufficient shaft/
tap speed - revolutions
Recommended pre-drilling of holes for thread forming
The stated values must always be verified with regard to the tensibility of the formed material.
Other articles:
Jak nabrousit vrták
Jak vybrat správný ruční závitník?
Vrtání a závitování jedním nástrojem
Jak vybrat strojní závitník?
