The structure and processing characteristics of the CBN inserts

With the rapid development of machinery manufacturing industry, more and more materials and Superhard materials which difficult to machine were widely used, machining tool is also a severe test, development of various good wear resistance, thermal stability, impact excellent Superhard cutting tool is an inevitable trend. Efficient processing, hard machining, dry machining, ultra-precision machining difficult materials and new machining direction of the tool is the development of the industry, CBN is the most advantageous tool material for machining high hardness as the current difficult to machine ferrous materials , is the future for precision and ultra-precision machining of the necessary tools.

Currently, CBN insert has a strong competitiveness in many machining of automotive, aerospace and medical equipment and other industrial fields .Mounting the CBN insert in the machine tool which has a good steel can take advantage of the CBN tools performance , CBN inserts also save the manufacturer costs , when you have a more favorable opportunity to improve productivity.

Part 1 Formal structures Category of the CBN inserts

1.Solid CBN inserts
Solid CBN blade has good wear resistance and impact resistance, especially when processing the cast iron material which ferrite-containing less than 10%.Large margin roughing and finishing are both OK, it greatly improved processing efficiency and reduce processing costs, as more and more high hardness castings produced by the more customers, the future market share there will be a big surge.

 2, composite CBN inserts
Composite CBN insert choose a better carbide substrate, the edge portion of the insert welded the CBN material, it has good wear resistance, mainly used in finishing material which hardness was more than HRC45 and a small margin, can get a well finish and dimensional accuracy.

 3. Mosaic CBN inserts
The so-called mosaic CBN inserts is a complete top surface sintered on a cemented carbide substrate, providing multiple cutting edge on just one side of of the tool, this tool is cheaper than the composite tool and can be made more cutting edge, largely reducing the processing costs, but mainly for the finishing process, control unilateral knife to eat in less than 0.3mm depth is well, enabling high-speed turning, finish up Ra0.8-0.4.

Part 2 The processing characteristics of CBN insert :

1.Suitable for processing materials with high hardness
 As CBN tools hardness rank only second to diamond, CBN and diamond tools are both name super-hard tools, the CBN tools mainly for machining ferrous materials with high hardness, the hardness of work piece control in general HRC45 or more, the processing effect is not ideal if the hardness less than HRC45.

Halnn superhard, the leader specializing in hard materials processing tools, mainly for research and development of the tools for high hardness and difficult machined material, such as Halnn developed a superhard BN-K1 grades CBN inserts, can machine the workpiece which has a high hardness HRC79, which is unimaginable before, but with the constant study and practice tool industry from Halnn Superhard tools company, ultimately be achieved.
 2. Roughing with large margin 
Integral CBN insert can achieve a large margin roughing, such as Halnn superhard company developed Integral CBN BN-S20 grade insert, depth of cut can up to 8mm, can eat over the entire insert, production efficiency was increased exponentially.
 3. High-speed cutting
Due to CBN tools good performance, can be fully realized high-speed cutting, and can be the perfect combination of CNC machine tools, efficient cutting of the workpiece greatly improved production efficiency.
Such as Halnn superhard companys CBN tools speed can reach 1500m / min when finishing without considering the lathes rigidity and clamping manner . Gray iron can be achieved high-speed cutting, and get a good finish and dimensional accuracy.
 4 Dry cutting

CBN tools have a high hot red hardness, if add coolant, its blade easily happen to crack when temperature plunged, so CBN inserts general machine the workpiece use dry machine , especially in the case of intermittent cutting, dry machine was not only environmentally friendly but also save some costs.
Part 3 Summary
CBN inserts is the best tool machining ferrous metal materials currently, with the application of high hardness and difficult materials increasingly widespread in the future, CBN blade market share will gradually increase, CBN insert will become the mainstay of hard materials processing industry in the future.