Composite materials are materials with a certain number of ratios of two or more different properties, which are artificially compounded by physical or chemical methods to form a multi-phase material with obvious interfaces between each phase and new properties. Various materials complement each other in terms of performance and produce a synergistic effect, so that the comprehensive performance of the composite material is better than the original composition material to meet various requirements.
Among the composite materials, fiber-reinforced materials with the advantages of small specific gravity, large specific strength and specific modulus, good fatigue resistance and corrosion resistance are the most widely used and the most used. For example, aerospace, automotive industry, chemical textile, machinery manufacturing, medicine and other fields. However, in the use process, in most cases, the composite material needs to be cut and trimmed. However, the poor processing performance of the composite material makes cutting difficult. During mechanical cutting, there are often phenomena such as wire drawing, brushing, delamination, bulging, and frictional scorching.
Commonly used mechanical cutting includes grinding wheel cutting and band saw cutting. Generally, when diamond grinding wheel is used for cutting, when the spindle speed is low, the cutter is not easy to cut the fiber and it is easy to pull the fiber out of the matrix; when the spindle speed is high, the cutting temperature is high, which makes the matrix melt and stick to the cutter Affect the material performance and cutting quality. When the band saw is used for cutting, the cutting efficiency is high, but the quality of the cut is poor, not flat enough, and fiber burrs will be generated at the exit edge, so the band saw cutting is generally only used for rough processing of composite materials.
In view of the above cutting shortcomings, diamond wire cutting has undoubtedly become a new choice. When the diamond wire diameter is Φ0.4mm and the wire transport speed is 5m / s, the cutting speed of unidirectional carbon fiber reinforced plastic, glass fiber reinforced plastic, flame retardant glass fiber reinforced plastic, aramid, carbon cloth, etc. 10mm / min. The incision is narrow and narrow, the cut surface is neat and smooth, the hierarchy is clear, and there is no drawing, drawing, delamination, bulging and frictional scorching. The composite material processed by this cutting can be classified as defect-free cutting, and can be directly used for the test of the interlayer shear strength, bending performance, tensile performance and other items of the composite material.
Based on the above cutting data and results, it can be seen that diamond wire cutting can be used to cut a variety of composite materials, and has a high cutting speed and cutting surface quality. Therefore, diamond wire cutting is the best choice for cutting composite materials.
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