31. What are the components and functions of machine tool fixtures?

The machine tool fixture is a device for clamping the workpiece on the machine tool. Its function is to keep the workpiece in a correct position relative to the machine tool and the cutting tool, and to maintain this position unchanged during the machining process. The components are: 1. Positioning components or devices. 2. Tool guiding components or devices. 3. Clamping components or devices. 4. Connecting components. 5. Clamp body. 6. Other components or devices.

Main functions: 1. Ensure processing quality 2. Improve production efficiency 3. Expand the scope of machine tool technology 4. Reduce workers’ labor intensity and ensure production safety.

32. How are machine tool fixtures classified according to their usage range?

1. Universal fixture 2. Special fixture 3. Adjustable fixture and group fixture 4. Combined fixture and random fixture

33. The workpiece is positioned on a plane. What are the commonly used positioning components? And analyze the situation of eliminating degrees of freedom.

The workpiece is positioned on a plane. Commonly used positioning components are 1. Fixed support 2. Adjustable support 3. Self-positioning support 4. Auxiliary support

34. The workpiece is positioned with a cylindrical hole. What are the commonly used positioning components? And analyze the situation of eliminating degrees of freedom.

The workpiece is positioned with a cylindrical hole. Commonly used positioning components include 1. Spindle 2. Positioning pin

35. When positioning a workpiece on an outer circular surface, what are the commonly used positioning components? And analyze the situation of eliminating degrees of freedom.

The workpiece is positioned on the outer circular surface. Commonly used positioning components include V-shaped blocks.

36. The workpiece is positioned with "two pins on one side". How to design the two pins?

1. Determine the size and tolerance of the center distance between the two pins. 2. Determine the diameter of the cylindrical pin and its tolerance. 3. Determine the width, diameter and tolerance of the rhombus pin.