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一、是非题 1.在机械制造的两种配合制度——基轴制与基孔制中,基轴制的上偏差为0。 2.为了使钢材得到良好的综合机械性能,必须进行淬火处理。 3.当冲床的滑块处于下死点位置,并将连杆调至最短时,滑块底面至冲床台面的距离叫做冲床的最小闭合高度。 4.冲床的压力在整个行程中是一个定值。 5.斜刃口落料时,凸模应作成平刃。 6.为了提高冲裁件断面质量,模具间隙越小越好。 7.为了防止零件弯曲时断裂,弯曲线应与材料的辗压纤维方向垂直。
First, the problem is not 1. In the machinery of the two with the system - the basic shaft system and the base hole system, the base system deviation of 0. 2. In order to obtain good overall mechanical properties of steel, it must be quenched. 3. When the punch press the slider in the position of the bottom dead center, and the link to the shortest, the bottom of the slider to the punch table surface is called the minimum closing height of the punch. 4. Punch pressure throughout the trip is a fixed value. 5. Inclined cutting edge blanking, punch should be made of flat blade. In order to improve the quality of blanking section, the smaller the die gap, the better. 7. In order to prevent bending when the part is bent, the bending line should be perpendicular to the direction of the material being rolled.