Correctly select the number of teeth of the milling cutter to maximize the processing efficiency of the product

In the manufacture of various CNC machine tools and other machinery, CNC milling cutters and other devices are widely used. In recent years, with the advancement of numerical control technology and the general improvement of automation, the production and application of machining center machine tools, numerical control lathes, and numerical control milling machines have become more and more extensive, and the demand for high-precision and high-efficiency CNC milling cutters is also increasing. .

As manufacturers continue to introduce products with stronger functions and higher efficiency, the manufacturing of milling machines has become more and more complex and difficult. In addition to having complex contours and tighter tolerances, milling machines are usually made of high-performance materials, which provide the required strength and reliability, but also adversely affect machinability. As a common tool for machining planes, steps, grooves, forming surfaces and cutting workpieces on a milling machine, the milling cutter has one or more rotary cutters, and each cutter intermittently cuts off the remaining part of the workpiece during work. quantity.

In the process of milling machine processing with a milling cutter, the correct selection of the number of teeth of the milling cutter is very important in order to maximize the processing efficiency. For example, a sparse tooth milling cutter with a diameter of 100 mm has only 6 teeth, while a close tooth milling cutter with a diameter of 100 mm can have 8 teeth. Whether the teeth are dense or not will affect the production efficiency and product quality. If the cutter teeth are dense, the production efficiency will be improved and the quality of the processed workpiece will be better. However, the dense cutter teeth will also cause inconvenience in chip discharge. According to the diameter of the tooth, it can be divided into sparse tooth, fine tooth and dense tooth.

Sparse teeth are used for rough machining of workpieces. It uses 1 to 1.5 blades per 25.4mm diameter, which has a large chip holding space. This kind of tool is used for cutting soft materials that can produce continuous chips. Long blades and large width cutting are selected. Dense toothing is good for machining under stable conditions. It is generally used for rough machining of cast iron. It is also suitable for shallow cutting, narrow cutting of high-temperature alloys and cutting when no chip space is required. The dense tooth is used for fine milling, the axial depth of cut is 0.25 ~ 0.64mm, the cutting load of each tooth is small, and the required power is not large, such as the processing of thin-walled materials. The size of the tooth pitch will determine the number of cutter teeth involved in cutting at the same time during milling. During cutting, there should be at least one blade cutting to avoid milling impact, resulting in tool damage and overload of the machine tool.

In addition, the number of blade teeth must be selected so that the chips are properly curled and easily leave the cutting area. Improper chip holding space will result in chip retention, damage to the cutting edge and possibly damage to the workpiece. At the same time, the blade should have enough density to ensure that no less than one blade is cutting at any time during cutting. If this is not guaranteed, it will cause severe impact, which will lead to the break of the blade, the damage of the tool and the machine tool. Overloaded.