小型金相试样切割机机械部分的设计

Mechanical Structure Design of a Miniature Automatic Metallographic Sample Cutting Machine

小型自动化金相试样切割机由机械部分和控制部分组成,文中针对机械结构部分进行设计。设计的小型金相试样切割机机械部分由切割机构、进给机构、夹具、机体和冷却系统组成。采用切割系统固定不动、试样进给的切割方式工作。切割机构采用三相变速异步电动机变速驱动,以简化机械结构并实现切割速度可调。三个方向的进给采用步进电机驱动滚珠丝杠来实现。夹具采用了螺旋夹紧机构。

A miniature automatic metallographic specimen cutting machine consists of mechanical system and control system. In this paper, a design is focused on its mechanical structure, which is composed of cutting mechanism, feeding mechanism, clamping device, cooling system and the body. The mode that the cutting mechanism is fixed and specimens are fed into cutting mechanism is employed in this cutting machine. Three-phase asynchronous motor with variable speed is selected for driving the main shaft of the cutting mechanism, in order to simplify the cutting mechanical structure and to achieve the adjustable cutting speed. The three feed motinns of feeding mechanism are achieved by the moving of ball screws, which are driven by stepper motor. And a mode of spiral clamping is setected in the clamping device.