This paper is to present a comparative study of the straining behaviour of the material during fine blanking and conventional blanking. It can be demonstrated that if one metal hardens easier than the other, the resulting hardness distribution surrounding the blanked edge should reflect this phenomenon under different blanking actions. In this paper, materials used for this investigation are cold rolled mild steel sheet (SPCC) and aluminium alloy sheet which are both subjected to fine and conventional blanking under the same condition. It can be shown that fine blanking process will be mostly dominated by shearing mechanism rather than a combination of shearing and fracturing mechanisms as in conventional blanking process. This confirms that the metal with a higher n-value (ie., straining factor) will normally exhibit a gradual decrease in the hardness value over a wider area and vice versa. Also, the straining behaviour of the material which will be just the mirror image of the corresponding hardness distribution curve, is found to be heavily dependent on the nature of the blanking process, ie., whether the material is processed by fine blanking or normal conventional blanking.
ASJC Scopus subject areas
- Ceramics and Composites
- Computer Science Applications
- Metals and Alloys
- Industrial and Manufacturing Engineering