How to choose CNC milling cutters of various materials?

by:Ronix Tools     2021-06-16
CNC milling cutter arbor material use: 40Cr steel General CNC milling cutter processing process: quenching and tempering-----workpiece processing-----heat treatment----grinding the shank part----finished 40Cr steel Main characteristics: medium Carbon modulation steel, cold heading die steel. The steel is moderately priced and easy to process. After proper heat treatment, a certain degree of toughness, plasticity and wear resistance can be obtained. Normalizing can promote the spheroidization of the structure and improve the cutting performance of the hardness less than that of the blank. Tempering at a temperature of 550-570°C, the steel has the best comprehensive mechanical properties. The hardenability of this steel is higher than that of 45 steel, and it is suitable for surface hardening treatments such as high-frequency quenching and flame quenching. 40Cr steel is one of the widely used steels in the machinery manufacturing industry. After quenching and tempering, it has good comprehensive mechanical properties, good low-temperature impact toughness and low notch sensitivity. The hardenability of steel is good. It can be hardened to 28-60mm in water quenching and 15-40mm in oil quenching. In addition to quenching and tempering, this steel is also suitable for cyanidation and high-frequency quenching. The cutting performance is better. When the hardness is HB174~229, the relative machinability is 60%. In fact, different CNC tools perform cutting operations. Before considering which CNC tool to use for a specific operation, you need to understand the materials used by the manufacturer when producing the tool. Based on these materials, we classify CNC tools as:    1. Carbon steel tools    These tools are inexpensive and are mainly used for low-speed operations. They have a carbon content of 0.6-1.5% and contain a small amount of manganese and silicon. They are mainly twist drills, forming tools, milling cutters and turning.   2. High Speed u200bu200bSteel (HSS)    It is composed of high carbon steel and a reasonable amount of elemental alloys such as chromium, tungsten and molybdenum. Through this combination, it can improve hardness, wear resistance and toughness. It also provides higher removal rates for metals and other materials. In order to improve its performance, you need to apply a certain surface treatment.   3. Ceramic    These chemically inert tools are resistant to corrosion and are 10 times faster than high-speed steel. Generally, alumina and silicon nitride constitute ceramic materials. Projects that require finishing operations usually use ceramics.   4. Cemented carbide    These cemented carbide tools are specially designed for high-speed operation. They are very hard and can withstand temperatures up to 1000oC. Under normal circumstances, tantalum, titanium and tungsten can be manufactured. Operations that require high-quality surface treatment can also use them.   Other categories include diamond tools, cubic boron nitride (CBN), Sialon and cermets. The selection method of CNC milling cutter    1. The choice of CNC milling cutter should be selected according to the processing capacity of the machine tool, the performance of the workpiece material, the processing procedure, the cutting amount, the clamping size of the tool holder and other related factors.   2. The general principle of tool selection is: convenient installation and adjustment, good rigidity, high durability and high precision. On the premise of meeting the processing requirements, try to choose a shorter tool holder to improve the rigidity of tool processing. The basic principle of choosing CNC milling cutters      In economical CNC machining, since the grinding, measuring and changing of tools require manual operations, this does take a long time. Therefore, we need to arrange an appropriate order for each CNC machine tool . The basic principles for selecting CNC milling cutters are as follows: 1. Minimize the number of cutting tools; 2. After clamping the tool, all machining parts should be completed; 3. Roughing CNC milling cutters should be used alone, even if they are of the same specification   4. Milling is carried out before drilling;    5. Surface processing first, and then two-dimensional contour processing;    6. When possible, use automatic changes in CNC machining to increase the rate;
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