The results show that the effects on surface roughness are feed speed, depth of cutting , tool rake angle and parts hardness in turn.
结果表明：工件进给速度对表面粗糙度的影响最大，切削深度和刀具前角次之，工件硬度影响最小。
The feed equipment of impact crusher was improved. A rational structural and simple feeding device was designed. It can be connected with the impact crusher at any Angle in the horizontal position.
对机械冲击式粉碎机的进料装置进行改进，设计了一个结构合理、简单的进料装置，可在水平位置按任意角度连接在冲击式粉碎机上。
In this system the crankshaft rotating Angle, where the peak combustion pressure occurs, is taken to be a feed back signal, so that the ignition timing of the engine is able to be controlled.
该控制系统利用最高燃烧压力点的曲轴转角作为反馈信号，实现其对发动机点火正时的控制。
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