Quality Research of Metal Parts Produced by Cold Sheet Forming


  • Ieva MARKŪNIENĖ Kaunas University of Technology
  • Joris VĖŽYS Kaunas University of Technology
  • Giedrius JANUŠAS Kaunas University of Technology




forming, cold stamping, metal, surface, damage.


Sheet metal forming is one of the most popular technologies for obtaining finished products in automotive industries. The main techniques of sheet metal forming: sheet microforming, warm/hot forming, incremental sheet forming, flexible-die forming, Electromagnetic sheet forming, Electrohydraulic forming, Spinning and Shear Spinning, Shear Spinning and Flow Forming and cold sheet forming. One most popular cold stamping process. In the production line of Ravne VPS400 1992, we take twenty details for looking quality review, looking for surface damage reasons - a little changing tonnage and speed. The biggest deformation, when velocity is the slowest the tonnage don’t have an impact on this radius deformation.

Firstly, we measured the surface for all twenty details with Contourograph CV-2100 M4. In one measurement point we have ten points which is the biggest or slowest tolerance, these results can be the reason why the detail is damage. These details make one tact process. We can say the recommendation – if the detail will be making for one more tact process, detail not be damage, but this extra process is a very grown the price.

Second, we see metal steel chemistry alloy elements, and we can be looking which elements have some reason mechanical properties of steels.

Our samples have not enough elasticity, and in steel structure we can recommend taking more carbon C, Silicon Si and Vanadium V. Silicon Si, is important for a machinability and tensile properties as well and this element is essential in steel structure.

Thirsty, we used the 3D coordinate measuring machine Mitutoyo SurfaceMeasure 606T, looking for tolerances differences.

And we see in detail which places will have a damage, we have the results lowest from the layout, we see the blue color. If we made detail not one tact process, but more tact’s making detail the thickness would be evenly gradually. The crystalline structure of the metal broke due to excessive thinning.