Introduced a cutting-bending die using on the automatic metal plate machining line,the die structure was simple,working stably and reliably.

However the productivity effect and quality of product are all hard to be guaranteed,because it is using turning,saw cutting and grinding-wheel cutting generally when baiting.

Structural design of square tube cutting equipment by applying punching technology;

In order to study the performance and effect of the cutter blade to cut off various staples,according to the working principles of staple cutting machine and the needs of the test,the main technical parameters were determined by cutting experiments and calculations for the size of knife wheel and staple consumption.

A description is made on a structure and operating principle of the progressive die for grooving and cut-off of junction pole.

In this paper,The reasonable approaches of organic synthesis have been designed to use analytic and examinatorial program by means of corey's concept of synthon and disconnection,in the meantime ,some common synthetic tactics have been suggested.

With the study of battery discharge features in base stations,after the analysis on the disconnection device for step loads classified by voltage and duration, the article believes the setup of this device exists abuse which might be harmful for battery operation and shorten its life time.

japonica clones which had undergone interconnection and disconnection treatments grew in four types of habitats whose overall soil nitrogen levels showed a gradient.