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钻床钻削工件(φ34~(±0.5)×25毫米)的端面时,使用弹簧卡具,因工件外径允差较大,很不方便。后来我们制造了内凸轮自紧夹具,结构简单,手柄转动角在15°～25°之间,可牢固夹紧工件。结构如图1所示。底座8压固在钻床工作台上。保持器3旋在件8上,用螺母7锁紧。件3外径与内凸轮套4内孔滑动配合,三个槽内放入夹紧柱9。盖板1是为防止件9脱落。件4与件7之间用垫圈5支承并滑动配合。扭簧6的两端,
Drilling machine drilling workpiece (φ34 ~ (± 0.5) × 25 mm) the end surface, the use of spring fixture, due to the workpiece diameter tolerance is very large, very inconvenient. Later, we made the inner cam self-tightening clamp, the structure is simple, the rotation angle of the handle is between 15 ° ~ 25 °, which can firmly clamp the workpiece. Structure shown in Figure 1. The base 8 is press-fixed on the drilling table. The holder 3 is screwed onto the piece 8 and locked with a nut 7. Piece 3 and the inner diameter of the inner cam sleeve 4 sliding fit, three slots into the clamping column 9. The cover 1 is for preventing the pieces 9 from falling off. Between the member 4 and the member 7 is supported by a washer 5 and slidably fitted. Both ends of the torsion spring 6,