10. 联轴器具有一定的补偿被联两轴轴线相对偏移的能力。 二、选择题
1.可以精确调整滚珠丝杠螺母副轴向间隙的结构形式是（ ）。 A.双螺母齿差式 B.双螺母垫片式 C. 双螺母螺纹式
2.对于高精度、高速旋转的滚珠丝杠应该采用（ ）安装方式。 A 两端游动 B 两端固定 C 一端固定，一端游动
3. 通过预紧可以消除滚珠丝杠螺母副的轴向间隙和提高轴向刚度，通常预紧力应为最大轴向负载的（ ）。
A. 1/2 B. 1/3 C. 1/4 D. 1 三、简答
1.数控机床进给系统中为什么要采用消隙齿轮箱？ 2.进给系统的“零传动”
第七章
一、填空题
1.从车床受力情况的分析来看，对加工精度影响较大的是 。
2. 肋板中纵向肋板的作用是 ，横向肋板的作用是 。
3．三角形导轨与矩形导轨相比，其导向精度 ，承载能力 。
4．提高支承件结构动刚度，在准静态区，主要提高 ；在共振区，主要增加 ；在惯性区，主要增加 。
5．导向精度主要是指运动部件沿导轨运动轨迹的
或 ，导轨的 精度直接影响导向精度。
6.支承件空心截面的惯性矩比实心的 ，圆形截面的抗扭刚度比方形的 ，抗弯刚度比方形的 。
7.导轨按照运动轨迹分为 、 ；按工作性质分为 、 、 ；按受力情况分
为 、 。
8．设计支承件应着重分析低阶固有频率和主振型，因为 ，
二、选择题
1．滚动导轨预紧力确定的一般原则是（ ）。
A.预紧力小于外载荷 B.预紧力等于外载荷 C. 预紧力大于外载荷 2. 为了有效提高抗弯刚度，纵向肋板应布置在（ ）平面内。 A 弯曲 B 与弯曲平面相垂直的 C 任意 3. 依靠几何形状封闭的导轨属于（ ） A 开式导轨 B 闭式导轨 三、简答
1.肋板起什么作用?有哪几种形式? 2.简述三角形--矩形组合导轨的使用特点。
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