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小冲头稳定性校校主要是确定冲头不发生失稳弯曲的最大长度Lmax。据目前资料介绍: 无导向装置的一般形状凸模不发生失稳的最大长度Lmax≤135(J/P)~(1/2) 有导向装置的一般形状凸模不发生失稳的最大长度Lrnax≤380(J/P)~(1/2) 其中J—凸模最小横断面惯性矩(毫米~4)。 P—冲裁力(公斤) 然而,在实际生产中,我们发现当凸模长度远超过上述公式所计算的极限值时,凸模仍不失稳而正常冲裁。本文就小冲头稳定性校核提出新的探讨。
Small punches stability school is to determine the main punch does not buckle the maximum length of bending Lmax. According to the current information: The general shape of the guide without the maximum length of the punch does not occur instability Lmax ≤ 135 (J / P) ~ (1/2) with the general shape of the guide punch does not occur the maximum length of instability Lrnax ≤ 380 (J / P) ~ (1/2) where J-punch minimum cross-sectional moment of inertia (mm ~ 4). P-punching force (kg) However, in actual production, we found that when the punch length far exceeds the limit calculated by the above formula, the punch is still not stablized and punched normally. This article puts forward a new discussion on the stability check of small punches.