Development of the cutting tools on Hard Cutting Precision

High Precision Rolls are mainly used for rolling Condensate tube, and the common materials will be Cr12MoV, and it is often through heat treatment, which belongs to hardened steel. For this high hardness materials workpiece, it can’t machine with traditional turning process, and it often adopt grinding process in the past times. However in modern times, we can use hard turning instead of grinding with high cutting speed. At early times, we use ceramic cutters for hard turning rolls, the processing efficiency can improve about 5~10 times. And nowadays, the manufactures will choose cbn inserts for hard turning the hardened steel rolls. The following will share the development.

Part 1 Hard Turning Process
Hard Turning is hard cutting the hardened steel with hardness between HRC54~63, and it is for final machining or finishing process, which help realize turning instead of grinding. Usually, the workpiece has finished the roughing process before heat treatment, and finishing process is only going on with hardened steel layer. With the development of turning process, hard turning already become an very common way in the modern process.

Part 2 Ceramic Cutters and CBN Inserts for hard cutting
The most difficult problems of realizing hard turning is the cutting tools, in the past times, it can only use carbide inserts or coating inserts, but they will wear easily. With the development of the cutting tools, ceramic cutting tools are widely used, because its thermal hardness, abrasion resistance and chemical stability are better than carbide insert and HSS insert, so it will be suitable for hard turning hardened steel. But in nowadays, CBN Inserts are so common in many Mechanical industries, and has proved that it is the right hard cutting tools for machining the hardened steel rolls.

Part 3 The Solutions on Main Materials Rolls with CBN Insert

With the development of the technology, the cutting tools on hard turning hardened steel rolls also become more and more wear resistant and obtain good performance, which help the manufacturers improve the processing efficiency and lower the costs.