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2022

Three principles of milling cutter selection

Author：

A milling cutter is a rotary tool with one or more teeth for milling operations. When working, each cutter tooth cuts off the allowance of the workpiece intermittently in turn. Milling cutters are mainly used for machining planes, steps, grooves, forming surfaces and cutting workpieces on milling machines. The author believes that when choosing a milling cutter, pay attention to the milling cutter body and tool holder:

1. The milling cutter is used on the CNC machining center or on the ordinary milling machine.

2. The material and hardness of the milling cutter.

3. The specifications of the milling cutter, such as: blade length, overall length, blade diameter, shank diameter, etc. If it is used on a CNC machining center, solid carbide should be used. White steel can be used for ordinary milling machines. White steel milling cutters are softer than carbide milling cutters. High-speed steel knives are cheap and have good toughness, but their strength is not high, making them easy to cut, and their wear resistance and thermal hardness are relatively poor. When the material is harder, if the coolant is not in place, it is easy to burn the knife, which is one of the reasons for the low thermal hardness. Carbide milling cutters have good thermal hardness and wear resistance, but their impact resistance is poor. If you drop the blade, it will be broken. Carbide is a material made of powder metallurgy. The hardness can reach about 90HRA, and the heat resistance can be Up to 900-1000 degrees. Therefore, white steel is suitable for ordinary milling machines, and alloy milling cutters are used in CNC machining centers.