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用可换锥形(扩口)和平面(翻口)冲头在固定凹模里扩口并形成平法兰的管端翻口方法是最常用的管端翻口工艺.这一工序由于必须更换冲头,因而劳动量大、生产率不高.但如果使用组合冲头结构,则可消除上述缺陷. 研制这些结构时,运用了锥形冲头管端扩口过程的特性,即冲头锥形部分倾角α_k足够大时,扩口侧壁的最大直径将远超过扩口冲头的锥形部分直径(图1).
The most commonly used tube end flaring process is the method of flaring and flattening the flare in a fixed die with interchangeable taper (flare) and flats (flare) punches, The replacement of punch, and therefore labor-intensive, productivity is not high, but if the combination of punch structure, you can eliminate the above defects.Development of these structures, the use of tapered punch pipe end flaring process characteristics, namely, punch cone When the partial inclination α_k is sufficiently large, the maximum diameter of the flared side wall will far exceed the diameter of the tapered portion of the flared punch (Fig. 1).