1. Scissors are complex and precise tools made of metal materials. They are not only hard and durable, but also very effective.
2. With the development of smelting technology, it is possible to make tools with metal materials. Most metals are not only hard and durable, but also very malleable. People can melt, stretch, bend, shape and reshape metals to make all kinds of complex and precise tools. The scissors we use now are such tools.
3. Scissors are a tool that can be processed flexibly and finely. People control the moving direction and opening and closing angle of the blade through the handle, and the change of the blade direction and angle can flexibly process and shear materials. People also skillfully designed various parts of scissors according to their needs, so that scissors can be better applied to many fields of life, such as clothing processing, medical surgery and so on.
4, the structure of scissors and the names and functions of each part: handle-one hand to hold, the space is just convenient for all five fingers to participate. The scissors shaft-fulcrum is inserted between two blades, and the lever principle is used. Blade-the front end of scissors.
Scissors mouth-suitable for cutting large-area and large-profile parts, saving time and effort. Back and front-suitable for cutting some parts with long lines. Center-suitable for one-time cutting, broken cutting, interspersed cutting and so on. Scissors tip-suitable for cutting small areas and short strips, not easy to be broken.
5. Scissors is a kind of combined tool, which has the structural characteristics of inclined plane and lever. The blade and conical tip of scissors are inclined planes, and the blade and handle rotate around the central axis, which can be regarded as levers. The iron core connecting the two blades is the fulcrum of the scissors. Combining various technologies is an important direction of tool development.
6. Classification of scissors: household scissors, medical scissors, flower scissors, dining table scissors, barber scissors, steel scissors, tailor scissors, nail scissors, telescopic scissors, etc.