To investigate a new type of low stress precision cropping system, it is necessary to obtain the feasibility that the heat stress was used to prefabricate the ideal crack of V-shaped notch tip.
针对研究新型低应力精密下料系统时，需要获得热应力预制V型槽尖端理想裂纹方法的有效性问题。
A new type of precision cropping machine utilizes variant frequency vibration to crop bar precisely with low stress, an system of measure and control of vibration in the machine is necessary.
新型下料机是利用变频振动实现低应力下料的，针对需要建立振动的有效测控系统的问题。
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