Place "A" panel (4" x 6"), sharp burr edge down, on bottom half of (4" x 12") so that cut edge of (4" x 6") barely covers all oil.

将A板（4*6）毛边向下平放在（4*12）板的下半部，一时（4*6）板刚好覆盖所有的油；

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The surface of the syringe must be clear and pure; rough edge, burr, plastic stream, defect are not allowed.

注射器表面必须清洁无杂质，不得有毛边、毛刺、塑流、缺损等缺陷。

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The shape of the male die cutting edge was determined by experiment. The products punched had minimal burr and smooth section.

通过试验确定了合理的凸模刃口形状，冲出的零件毛刺极小，产品断面平整光滑。

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