New composite materials precision machinery parts processing process study with the progress of science and technology, more and more of the materials used in precision machining
, in addition to the traditional some of the materials, and composite material, it is composed of two or more than two kinds of properties of different materials by combination technology means.
Constituent materials can have synergy effect on performance, is a kind of good new comprehensive engineering materials.
Besides with light weight and good mechanical properties, and excellent heat insulation, sound and shock absorption performance, widely used in aerospace and electronics and so on precision machinery parts processing.
Composite materials belong to difficult processing materials, when cutting parameters is not reasonable, can make the interlayer stress is too large and cause delamination.
Belongs to a kind of layer of degum form between a damage phenomenon, layered can seriously degrade the performance of the material, and even make the scrap processing precision machinery parts, even a tiny layered there are serious security hidden danger.
Cutting force aspects of composite material, can be divided into the following three parts: 1.
Overcome the resistance of the material elastic deformation processed;
Overcome by processing materials in the fiber fracture and matrix of shear resistance;
Overcome scraps of friction on the surface of the knife before and after the knife in the face of machining surface and surface friction resistance.
Among them, the cutting force mainly comes from the high strength carbon fiber cutting and cutting tools and precision mechanical parts machined part surface friction, while the volume of the resin content is about 50%, but compared with the carbon fiber, its ultimate strength is much lower, the resistance can be neglected.
The influence of cutting speed on cutting force is not big, especially for drilling, basically have no effect.
Feeding has a greater effect on cutting force, the basic linear relationship;
Has a greater effect on cutting force, cutting depth increases with the increase of cutting depth.
These laws and metal precision machining, cutting composite material cutting cutting force is very uneven, showed more obvious in the drilling, the drill pin torque present cyclical fluctuations, 2 times of the speed change frequency, this is mainly because in the process of drilling, as the rotation of drill tool edge and fibers of different Angle, fiber in turn after splitting, cutting and bending shear fracture process of different, and a periodic changes.
The vibration of the cutting force phenomenon can make the processing surface roughness value increases, affect the quality of precision machinery parts processing.
Experimental results show that the high speed cutting or use diamond tool can effectively reduce the cutting force, improve the quality of the composite material surface processing precision machinery parts.
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