Deep hole drilling is a complex process of drilling holes that are larger than 10 times the diameter of the drill bit. The process is used in a variety of industries such as aviation, aerospace, automotive, and medical technology. Deep hole drilling is used to create holes in materials that are difficult to machine such as hardened steel alloys, titanium, and high nickel alloys.
To achieve the desired hole size, deep hole drilling inserts are used as they are specifically designed for intricate and precise drilling tasks. These inserts are made of tough, high-speed steel with carbide tips to ensure an efficient and accurate drill. However, using deep hole drilling inserts in hardened materials can be challenging and requires proper techniques.
Choose the Right Cutting Edge Geometry
The cutting edge geometry of the inserts plays a significant role in the drilling process. Insert geometries designed for drilling in hardened materials are usually different from those designed for softer materials such as aluminum or mild steel. The right cutting edge geometry and angle prevent premature insert failure, improve the chip evacuation process, and reduce tool deflection.
Use the Proper Lubrication
Lubrication is crucial when drilling hardened materials. It helps prevent tool breakage, increase tool life and reduces the heat generated during the drilling process. The type of lubrication used varies depending on the material being drilled. Water-soluble lubricants are generally suitable for soft materials while oil-based lubricants are recommended for harder materials. It is essential to use the recommended lubrication CNC Inserts for the insert being used.
Control the Speed of the Drill
Controlling the drilling speed plays a significant role in the success of deep hole drilling in hardened materials. High drilling speeds can cause premature insert failure, while low drilling speeds can lead to slower production rates. The ideal drilling speed varies depending on the material hardness, diameter of the hole, and the type of insert being used. Operators must refer to the manufacturer's recommendations to ensure that the correct speed is used.
Avoid Overheating
During the drilling process, heat builds up and can cause premature insert failure, reduce tool life, and affect the surface finish of the hole. Operators should use high-pressure coolant systems to reduce the heat build-up during the drilling process, lubricate the drill, shoulder milling cutters and flush chips from the hole. Using the proper lubrication can also help minimize the heat build-up during the drilling process.
Conclusion
Using deep hole drilling inserts in hardened materials requires careful consideration of the cutting edge geometry, lubrication, drill speed, and prevention of overheating. By taking these precautions, operators can create precise and intricate holes in hardened materials with minimal tool wear.
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