Box joint cuticle nippers

Die wichtigsten Bearbeitungsstufen bei den durchgesteckten Hautzangen sind:

Production

The basic material (forged part) is given its relevant shape for further processing. For cuticle and nail nippers ZWILLING J.A. HENCKELS uses steel bars made of normal steel and FRIODUR®, ice-hardened steel.

The most important manufacturing steps at a glance:

  • Cutting to shape: slugs cut from a long flat steel bar provide the basic material for the forging of the nipper blade.
  • Heating: the slugs are heated to 1000 – 1100°C.
  • Forging: in the die-block the slugs are given their first rough shape (box joint blade or lap joint blade).
  • Cutting out the blank: the blank is deburred on an eccentric power press (punched out).
  • Removing forging residue by sand blasting.
  • Shaping the upper and lower blades on a press.

Mechanically producing the blank

The following manufacturing steps are carried out:

  • Milling:
    Precise milling of the closing surfaces; milling of the “box”, i.e. the clearance through which the second nipper half is inserted.
  • Drilling:
    Drilling the screw hole; cutting of the thread; hobbing the bearing for the screw head.
    Drilling and thread cutting for the spring bolt.

Assembly

The nipper blades are screwed together. The blades and points are adjusted. The cutting edges of nippers must fit precisely so that the nail or a protruding piece of skin can be cut smoothly and cleanly.

Hardening

The most important manufacturing steps are:

  • Heating
  • Cooling
  • Tempering to reduce the steel’s tension
  • ZWILLING J.A. HENCKELS has optimised the hardening process for quality steel. Products made of this refined steel carry the trademark FRIODUR.

Surface treatment

Grinding nippers is an elaborate process which is done by high-precision machines. ZWILLING J.A. HENCKELS pays particular attention to the treatment of the joint area because an accurate shape is decisive for the efficiency of the nippers.

The manufacturing steps are:

  • The between blade and box blade are rough-dry and fine-dry ground.
  • Cutting: grinding.
  • Nickel plating for normal steel nippers and polishing.
  • The surface of high-grade steel nippers is polished or/and brushed.

Honing and final inspection

The manufacturing steps are:

  • Seal filing and sharpening of the blade.
  • Honing on an oilstone.
  • Testing the cutting performance and the closing force of the nippers.

Important:
All production stages are subject to stringent and regular quality control.