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当使用细长的小冲头在抗剪强度较高、厚度较大的坯料上冲孔时,冲头承受了很大的压缩应力和弯曲应力。当冲头的长径比大于5时,在使用中就会产生种种麻烦,因此必须采用特殊的方法加以强化。 1.单件圆形冲头在下列情况下必须对小孔冲头采取强化措施: (1)冲孔直径小于0.100in; (2)板料抗剪强度较低,孔径:料厚<1.5; (3)板料抗剪强度较高,孔径;料厚<2。强化方法为:(1)加粗冲头杆部;(2)附加支承套管。首先可以采用较大直径的冲头杆部和较短的冲切部分。这类冲头常用的尺寸比例参见图
The punch suffers from significant compressive and flexural stresses when punched in blanks with high shear and thicknesses using slender small punches. When the aspect ratio of the punch is more than 5, there will be a lot of troubles in use, so it must be strengthened by a special method. 1. Single circular punch punch in the following cases must be taken to strengthen the punches: (1) punching diameter of less than 0.100in; (2) Shear lower shear strength, pore size: material thickness <1.5; (3) High shear strength of sheets, pore size; material thickness <2. Reinforcement methods are: (1) bold punch head; (2) additional bearing sleeve. First, a larger diameter punch shank and a shorter blanking section can be used. Such punch commonly used size ratio see Figure