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大长宽比矩形孔是指长边S_1与短边S_2之比大于2以上的孔。对于此类矩形孔,预孔应加工成如图1所示的“腰子形”孔,采取图2所示的拉削图,用一把如图3所示的矩形孔拉刀拉成。拉刀的削角齿部分(拉刀第一段)拉去图2上的第1部分,相对两窄面,刀齿拉去图2上的第2部分,相对两宽面,刀齿拉去图2上的第3部分。采用这种拉削方法有较好的技术经济效益。
A large aspect ratio rectangular hole refers to a hole whose ratio of the long side S_1 to the short side S_2 is greater than 2. For such rectangular holes, pre-holes should be machined into “kidney-shaped” holes as shown in Fig. 1, drawn using a broach as shown in Fig. 2 and drawn into a rectangular hole as shown in Fig. Broach part of the broach (broach the first paragraph) to pull the first part of Figure 2, the relative two narrow surface, the teeth pulled to Figure 2 on the second part of the relative width of the face, the teeth pulled away Figure 2 on the third part. Using this broaching method has a better technical and economic benefits.