At present, the commonly used binders can be classified into metal binders (such as Ni, Co, Ti, Ti-Al, etc.) and ceramic binders (such as TiN, TiC, TiCN, Al2O3, etc.) according to their physical and chemical properties; According to the action, it can be divided into catalysts (such as Al, AlN, AlB2, Si, etc.) and solvent (such as Ti, Ni, Co, TiN, TiC, TiCN, etc.). Both the type and amount of binder have different effects on the performance of the PCBN insert. Carbide, nitride, carbonitride can improve the chemical wear resistance and impact resistance of PCBN inserts, but too high content will reduce tool hardness and shorten tool life; cobalt is the most commonly used binder to improve CBN sintering. Titanium sintering time; Ti ceramic binder can improve the toughness of PCBN insert; aluminum and aluminum compounds can react with CBN particles and other binders to make CBN particles bond more firmly and improve tool wear resistance; The mixture with Al, AlN and AlB2 is an effective catalyst for the conversion of HBN to CBN. Adding a small amount of Al and Si to the ceramic binder can also enhance the bond between CBN and form a continuous ceramic phase [12]; The PCBN composite sheet with nickel as a binder is highly conductive and suitable for cutting with low-cost electric spark.
Due to the different binders, PCBN inserts now tend to have two characteristics: one is high wear resistance (high content CBN, catalytic binder), and the other is good impact resistance (low content CBN) , ceramic binder).
3 PCBN blade market status
At present, the manufacturers of PCBN inserts at home and abroad are uneven, and there are great differences in the quality of PCBN inserts. However, in general, domestic PCBN inserts have a certain gap in terms of quality, specifications and varieties compared with foreign products. Table 1 compares the grades produced by major PCBN blade manufacturers at home and abroad and their main components. (slightly)
As can be seen from Table 1, with the deepening of research and manufacturing, foreign PCBN blades have now become serialized, which brings specialization of applications; on the other hand, the size of PCBN composite sheets is also large, and the available specifications are currently 57mm. , 74mm, 101.6mm, etc. Large composite sheets not only reduce the cost per unit area, but also improve the utilization rate, and are more suitable for users to manufacture blades of various specifications. In addition, the introduction of integrated inserts (eg, Seco CBN100, CBN30, CBN300, etc.) overcomes the cutting depth limitations due to the small size of the welded PCBN inserts and the risk of PCBN failure due to solder joint failure during processing; PCBN inserts Materials have also been developed in a variety of forms, coated PCBN inserts have been successfully developed and used in industrial production (such as Sumitomo BNC80, BNC150, BNC200; Seco CBN50C, CBN400C, etc.).
Although China's research and manufacture of PCBN materials began earlier, it has limited the application and development of PCBN tools because of the previous practice in the domestic manufacturing industry to use hard alloys and ordinary abrasives to process iron-based metals. At present, although the number of manufacturers capable of manufacturing PCBN inserts in China is large, the overall strength is poor, the types of products are small, and the quality is relatively poor. Therefore, in the automotive industry and other key users to cut difficult materials, China's PCBN blades are mostly dependent on imports.
PCBN insert. 4 <br> <br> trend since PCBN tool has unique advantages in terms of processing an iron-based metal, which is suitable for high speed cutting technology, the "turning instead of grinding" technology, not only the cost but also improves Production efficiency will surely make PCBN tools widely available in China. At the same time, the tool manufacturer's position from a pure tool supplier has risen to become a key partner of the user's enterprise to improve production efficiency and product quality, reduce manufacturing costs, making the PCBN blade material develop in a diversified and serialized way to adapt to different Cutting of materials. At present, PCBN composite materials, coating technology, and PCBN nanotechnology have become the main directions for the development of PCBN blade materials in the future.
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