The advantages and application of cbn inserts hard turning b
Category：News
PublishedDate：2017-10-18
With the development of modern technology, it require higher on the precision of the large scale bearings, and the tolerance grade also reach P4 and P5. Normally, large bearings use CNC Lathe and Grinding Tools, and because of the limitation of the grinding process, the efficiency is low and the tool cost is high.
With the research and use of the superhard cutting tools (CBN Insert), in many cold process, turning process can replace grinding. This article will share you the process of hard turning bearings rings, and the surface roughness will reach Ra0.4~0.8, and can meet the requirements of the bearing.
1. The characters of cbn insert for hard turning bearings
CBN Insert is the best materials for machining ferrous metal materials in current times, and has high hardness and wear resistance, the hardness is only second to diamond tools. It has good performance when machining high hardness materials.
CBN Insert has high stable performance and high temperature red hardness, whenthe cutting temperature is high, the materials soften, which will be benefit for the cutting process.
CBN Insert has high antioxidant capacity, and will not react with iron materials in the temperature 1200~1300 ℃,however it will occur Hydrolysis at 1000 ℃，so when we use cbn inserts machining bearings, we need use dry cutting methods.
CBN Insert has low Co-efficient of friction, and will not easily form the chipping layer, and can improve the surface quality of the workpiece.
2. CBN materials for hard turning bearings
The allowance for machining large scale bearing is large, we usually use solid cbn insert to try to reduce the cutting steps and improve the efficiency. And BN-S20 Solid CBN Insert is one of the most widely used cbn materials.
BN-S20 belong to solid cbn insert, the hardness is about HRC95~1000, and adopt ceramic as the binder, which can make sure the excellent wear resistance and high chemical resistance in high temperature.
For example, machining wind power bearings with diameter 1900mm, thickness 130mm, if use grinding process, the grinding time is about more than 18h; if use turning instead of grinding process, it only needs about 4.5h. And the roughness can reach Ra0.3μm，the processing efficiency of turning is about 4 times of grinding. And all the costs only have 20% percent.
3. The advantages of cbn inserts hard turning bearings
(1) Efficiency improved several times,
(2) It is suitable for mass order, and is durable.
(3) Reduce the pollution: compared with grinding process, the chips are easily reclyed. And turning process don’t need cutting fluid.
4.Conclusion
If we use cbn cutting tools hard turning bearings with CNC Lathe, it will have high working efficiency, and lower the tool costs. With the development of the cutting tools industry, more and more bearings manufacturer use cbn insert instead of grinding process.
If you also would like to know something about turning instead of grinding with cbn inserts, please feel free to contact with us info@halnntools.com, skype:info@halnntools.com, Whatsapp:+8615617635382, Wechat: Halnntools.