Fast cutting clearance evaluation in piercing processes by means of vision system

by

Fast cutting clearance evaluation in piercing processes by means of vision system

Cezary Jasiński, Łukasz Morawiński

Department of Production Engineering, Warsaw University of Technology, Narbutta 85, 02-524 Warsaw, Poland.

DOI:

https://doi.org/10.7494/cmms.2017.3.0607

Abstract:

Cutting is one of the most commonly used processes in sheet metal forming. One of the most important parameters of this process is the clearance. Clearance value is defined as the distance between the cutting edge of the punch and the cutting edge of the die. It is relative to the sheet thickness and has a significant effect on the quality of the cutting hole surface, the size of the hole and the possibility of a burr occurring or the rollover area on the edge of the product. In the cutting process clearance value increase during tools wear. Its correct evaluation allows to determine moment when the tools should be replaced. In the presented paper authors have proposed fast clearance evaluation method base on the geometry measurement of the finished product. Measurements was carried out by means of vision system equipped with specially designed illumination, which allows to extract the rollover area at the edge of the hole. Then measured rollover area diameter was compared to clearance values.

Cite as:

Jasiński, C., Morawiński, Ł. (2017). Fast cutting clearance evaluation in piercing processes by means of vision system. Computer Methods in Materials Science, 17(3), 164 – 176. https://doi.org/10.7494/cmms.2017.3.0607

Article (PDF):

Keywords:

Shear Cutting, Cutting Clearance, Vision System

References:

Arslan, Y., Özdemir, A., 2016, Punch structure, punch wear andcut profiles of AISI 304 stainless steel sheet blanksmanufactured using cryogenically treated AISI D3 toolsteel punches, The International Journal of AdvancedManufacturing Technology, 87, 1, 587-599.

Erbel, S., Kuczyński, K., Olejnik, L., 2003, Technologia obróbkiplastycznej – Laboratorium. Warszawa: OficynaWydawnicza Politechniki Warszawskiej (in Polish).Faura, F., Sebastián, M., Zamora, R., 2001, A decision supportsystem for sheet metal blanking process parameters selection,Journal of Materials Processing Technology,118 ,1-3, 371-376.

Greban, F., Monteil, G., Roizard, X., 2007, Influence of thestructure of blanked materials upon the blanking qualityof copper alloys, Journal of Materials Processing Technology,186, 27-32.

Morawiński, Ł, Jasiński, C., Kocańda, A., 2013, Rekonstrukcjageometrii pęknięć powstałych w blachach w procesachgięcia i wytłaczania przez rozciąganie, Przegląd Mechaniczny,10, 35-39 (in Polish).

Mucha, J., Jaworski, J., 2017, The Quality Issue of the PartsBlanked from Thin Silicon Sheets, Journal of MaterialsEngineering and Performance, 26, 4, 1865-1877.

Nothhaft, K., Suh, J., Golle, M., Picas, I., Casellas, D., Volk,W., 2012, Shear cutting of press hardened steel: influenceof punch chamfer on process forces, tool stressesand sheared edge qualities, Production Engineering, 6,4, 413-420.