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Designating of clearance value in punching is especially vital. The reasonableness of clearance value has an impact on the section burr height of blanking pieces, the width of the section bright belt, the section gradient and the dimension precision of blanking pieces. Combining with actual production, it aims to conduct a test on designating of blanking clearance value of deep drawing products 08F steel plate made by Nanjing Tang Yi Precision Machinery Manufacturing Co., Ltd.. Through fixing the die size to change the punch size, five groups lf different clearance were got and blanked. And then the dimension precision, the burr height and the bright band width of products with different clearance values were analyzed, and the influence law of clearance on product quality of section was found out. The test results show that the clearance value increases from 0.15 mm (6% of plate depth) to 0.3 mm(12% of plate depth), the burr height of workpiece fracture decreases greatly and stays 0.03-0.04 mm, the bright belt rate is moderate, the inclined angle of cross section is small, the product size is stable, the waster rate reduces, and the lifetime of die increases.
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