Multi-Blow Cold Formed Screws

With full in-house tooling and manufacturing capabilities and a team of highly skilled engineering professionals, Unisteel is experienced in producing intricate multi-operation cold formed components within a single manufacturing cost structure, resulting in lower component costs.

Using special progressive multi-stage machines, multi-blow cold forming is the go-to process for applications requiring components with complex internal and external part geometries. This process forms intricate shapes by deforming and splitting metal into the intended shapes, without any loss in material.

From 1 die 2 blow heading machines, right through to state-of-the-art seven station parts formers, parts such as gears, shafts, studs, pins, collars, spacers and specialized fasteners can be rapidly produced through our cold forming techniques.

Features & Benefits

  • Ability to create various shapes
  • Parts can be formed into net or near net shapes
  • Multiple material capabilities
  • Consistency in quality and hold close tolerance
  • Increased hardness and improved grain structure
  • Material cost savings
  • Better functional reliability
  • Available for mass production
Material : Carbon steel, stainless steel, titanium, aluminium and brass.
Size Range : 0.3mm – 10.0mm (diameter)
Length : 1.5mm – 38.0mm

 
Types of Cold Forming Shapes

Upsetting
A method to form heads on fasteners, material contained in the die is forced outward by the punch to produce a large cross section than the initial blank. This technique may yield diameter increases of 2-3 times the starting diameter.

Extrusion
The extrusion process forces the material to flow in the open space between a die and a punch. There are two types – forward and backward. Both types may be deployed simultaneously in some designs.

  • Forward extrusion is a method to reduce diameter. Material is forced forward by the punch through an orifice in the die, producing a smaller cross section than the initial blank.
  • Backward extrusion is where material is contained in the die and forced backward around the punch, producing blind holes and cups.


Flatten & Pierce

  • Flattening is an alternate form of upsetting.
  • Piercing is a method of providing a through hole in a work piece at much higher rates than drillings and without creating machining shavings.


Trimming

Trimming process is the shearing of excess material from the headed configuration of complex shapes so as to obtain the final design and specifications

Ironing
Usually performed as a secondary operation, ironing reduces the outside diameter by thinning the side walls. This technique is also used to size the inside diameter and outside diameter of a part. The material that is moved goes into the overall length.

Flaring
Flaring is used to increase the outside diameter and inside diameter of the open end of a hollow cylindrical part which may result in slight thinning of the wall. Two times the starting diameter can be achieved.