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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,基轴制轴的上偏差为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,滑块底而至冲床台面的距离,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。(√)
First, the non-issue 1. In the machinery manufacturing of the two with the system - the basic shaft and base-hole system, the axis of the shaft 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 distance from the bottom of the slider to the punch table, called the minimum closing height of the punch. (×) 4. Punch pressure throughout the trip is a constant value. (×) 5. Bevel edge blanking, the punch should be made of flat blade. (√)