What is CBN Tools ?

• What is CBN TOOLS?

CBN insert is a professional hard material cutting tool, the main processing objects are high-hardness cast iron, high-hardness steel (hardness after quenching is above HRC45). SCBN TOOLS CBN inserts have been continuously improved and are currently available in three structures: solid insert, through-welding insert and tipped insert.

For the finishing process, the main material is quenched high-hardness steel. Common parts are gears, bearings, ball screws, molds, etc. The commonly used tool grade are SBH150 and SBH170.

For the rough machining process, the main materials are high-hardness cast iron, high-hardness steel and other materials. The commonly used tool materials are SCBN TOOLS SBN900, SBN750.

• What material parts can CBN insert be ued to machine? How to choose CBN insert grade?

1. Hardened steel: parts such as hardened gears/gear shafts, bearings, molds, synchronizers, ball cage universal joints, and hardened rolls are typical hardened parts with a hardness of about HRC60. SCBN TOOLS SBH170 grade CBN inserts can be easily solve and guarantee a high surface finish.

2. High hardness cast iron/cast steel/forged steel: such as high chromium cast iron, alloy cast iron, nickel hard cast iron, white cast iron, high manganese steel, high-speed steel and other materials can be processed, and SCBN TOOLS SBN900 grades can be used for processing such workpieces The overall polycrystalline CBN insert has a large allowance for cutting the blank, which improves the production efficiency and reduces the total production cost.

3. Ordinary gray cast iron: such as engine block/cylinder head, brake disc, brake drum, pulley, clutch pressure plate, etc. are all gray cast iron materials. The SCBN TOOLS SBN750 grade CBN insert can advantageously replace the carbide insert for high-speed cutting, and on the basis of ensuring high surface quality, the tool life is 10-20 times that of the carbide insert.

• Advantages of CBN insert for processing hardened steel:

1. High hardness, good red hardness at high temperature, especially for hard-to-machine materials with high hardness. After quenching, the hardness of quenched steel can reach above HRC55, and it is difficult for ordinary tools to process. The microhardness of SCBN TOOLS CBN single crystal is HV8000~9000, which is the second highest hardness material known so far. Therefore, CBN inserts made of SCBN TOOLS can easily turn high hardness workpieces of about HRC55~62, which is a turning process. Preferred tool grade for hardened steel.

   
   

2. High temperature resistance and good thermal conductivity. When processing hardened steel, the unit cutting force is large, the cutting temperature is high, and the ordinary tool wears seriously. The heat-resistant temperature of SCBN TOOLS CBN inserts can reach 1400~1500℃, and it can maintain excellent machining effect even at 1200~1300℃, and there will be no tool wear caused by high temperature.

   
   

3. Strong wear resistance, good impact toughness and no chipping. Some quenched steel workpieces have intermittent cutting conditions, and the phenomenon of common tool chipping is serious. CBN insert have good wear resistance and impact toughness, and even in high-speed cutting conditions, there will be no chipping, which meets the intermittent cutting requirements of hardened steel workpieces.

   
   

4. High machining accuracy. It is difficult for conventional tools to achieve the finishing of hardened steel, and grinding is often the main method. SCBN TOOLS CBN insert has a low friction coefficient, can hard turn hardened steel, achieves the effect of turning grinding instead of grinding, meets the processing accuracy requirements of hardened steel, and greatly improves the processing efficiency of hardened steel.

SCBN TOOLS CBN inserts can realize the effects of turning grinding and milling instead of grinding, which greatly improves the production and processing efficiency and reduces the overall production and processing cost.

According to different processing conditions, CBN inserts of different materials need to be selected, and you can contact the tools’ engineers for consultation.