small lot and compact cold forging pre-treatment line (WLS)

What is Wet-blast Lubricant System?
Integrated Line by Lubricant Coating and Wet-blast

WLS for pre-treatment of precise cold-forging billet

The new equipment "WLS" is coming! Environment-responsive and suitable for global production. WLS is a compact treatment equipment without damaging or denting a billet in precise cold-forging process from pre-treatment to applying lubricant.

Process flow of precise cold-forging billet


Work pieceBillet
Work sizeDiameter : 25-40mm
Length : 30-70mm
Processing time5s/piece
Gun1/2 in. Long Blast Gun x 2
Power supplyAC200V, 50/60Hz, 3 phases
Power consumptionApprox. 23.2kW (Total rated apparent power of all the cell)
Air supply pressure0.5MPa or more, 0.7MPa and below
Air consumption4.1m3/min (NTP at 0.4 MPa of preset blast air pressure)
ExhaustAbout 7m3/min


The system WLS (Wet Blast Lubricant System) that our company offers has the characteristics which are stated below.

  • 1) Compact process line by largely reducing ordinary processes.
  • 2) High space‐productivity
  • 3) Higher throughput

Compared with ordinary processing

There were several problems of the ordinary processing method before forging such as increase in rejection rate due to process separation, reduction of spatial usability and increase in in-process stock. WLS removes scale, degreases and cleans dirt by wet-blasting at the same time and then applies lubricants coating directly.

WLS process chart

Effects of Wet blast

Before Billet before processing
After Processed billet
  • 1) Surface forming that is suitable for solid lubricant coating.
  • 2) Cleaning dirt and grease.
  • 3) Removal of scale.

Why can the solid lubricant be coated neatly?

The surface after wet-blasting is completely cleaned and degreased. Because of enhanced wettability and durability achieved by micro-surface roughness, uniform coating of solid lubricants can be made.

Drop of water on untreated surface

When the surface is flat, the surface tension is working and the droplet shrinks.

Drop of water on wet-blasting treated surface

The fine uneven surface prevents the droplet movement (shrinks).

Abrasives for forging process “GH0.10-0.20

G10 G10
  • Name : GH0.10-0.20
  • Material : High hardened stainless steel
  • Shaoe : Grit shape
  • Hardness : HV750 (Cutwire SUS304 is around HV200)


  • It has 1.5 times more cutting ability power than the original abrasives (Alumina abrasives of ceramics series). *Figure 1
  • Abrasion and consumption are extremely small, due to hard particles. *Figure 2
  • Waste amount can be decreased more than 10 times, compared to original abrasives.
  • Retrieve it by using an iron powder collection equipment, and do away with it as valuables.

Processing power of special stainless abrasives. -Figure 1

  • Processing conditions
  • Work piece : Stainless steel
  • Air pressure : 0.2MPa