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Punch and die wear irregularity at blanking of sheet rectangular parts

100%

Yavorovsky V. , Roshchina I.

Zeszyty Naukowe Politechniki Rzeszowskiej. Mechanika

2000

tom z. 54 [179]

103-110

The punch and die wear of blanking dies is known to depend on the sort of material, deformation condition, thickness and shape of a part under blanking, a kind of press and die design, etc. The irregular wear of cutting edges at the face and sides of the punch and die is revealed with blanking a rectangular plate having the first or second order of difference among its dimensions. The paper considers the results of this irregularity examination by measuring the coordinates of well-worn working contour in a tool microscope and description of the contour with mathematical simulation methods. Stock of various thicknesses and different materials is blanked. Numerous experiments confirm previously known details of the wear and describe new facts. The springing of stock metal to be of small thickness is shown to influence extremely the irregularity of wear before parting the blank with the stock. The further research study of the irregularity of blanking process itself for parts of intricate shape is outlined.