A cutting cutter is a rotary tool for the treatment of milling with one or more tool teeth. During work, each knife teeth cut the remaining amount of the part intermittently. The milling cutters are mainly used to treat planes, steps, grooves, the formation of surfaces and the cutting of parts on the dying machines.
The author believes that when choosing a milling cutter, you must pay attention to both the striker’s body and the tool holder:
Is the millingr used in CNC machining centers or ordinary milling costs?
Materials and hardness of the treatment of milling strawberries.
Strawberry specifications, such as: blade length, complete length, blade diameter, handle diameter, etc.
If used in a CNC machining center, it must be in integrated cemented carbide. White steel can be used for ordinary milling.
The hardness of white steel strawberries is softer than that of cemented carbide strawberries. The high -speed steel knives are cheap, have good tenacity, but not high resistance, easy to make the knife and have relatively bad wear and thermal hardness. Duration of approximately 65 hours. .
Cealing carbide strawberries have good resistance to thermal hardness and wear, but poor resistance to impact. 900-1000 degrees. Consequently, white steel is suitable for ordinary milling costs and alloy strawberries are suitable for CNC machining centers.
1. Selection of the diameter of the cutter cut
The selection of the diameter of the cutter cut varies considerably depending on the volume of the product and production batch.
1. Planar milling cutter
When choosing the diameter of a planar milling cutter, it is mainly necessary to consider that the power required for the tool must be in the power range of the machine tool, and the diameter of the pin of the machine- tool can also be used as a selection base. The diameter of the plane grinding fragment can be selected as D = 1.5D (D is the diameter of the spindle). During mass production, the diameter of the tool can also be selected at 1.6 times the cutting width of the part.
2. End
The choice of the diameter of the final mill should mainly consider the requirements of the size of the treatment of the part and guarantee that the power required for the tool is in the nominal power range of the machine tool. If you are a small diameter end mill, you must mainly determine whether the maximum rotation number of the tool-machine can reach the minimum cutting speed of the tool (60 m / min).
3. Slit strawberry cutter
The diameter and width of groove fraignage must be selected according to the size of the machining part, and the cutting supply is in the eligible supply range of the machine tool.
2. Selection of cuttime blades
1. For fine milling, it is preferable to use grinding inserts. This type of insert has good dimensional precision, so that the point of positioning of the tip of the molding is high, which can achieve better machining precision and surface roughness. In addition, the development trend of grinding grinding inserts used for the finish is to grind the routing grooves to form a large positive front -angle cutting, allowing the insert to cut on small foods and A small cutting depth. For cemented carbide blades without sharp angles, when small foods and deep cutting treatments are used, the tip of the tool will rub against the room and the lifespan of the tool is short.
2. It is more suitable to choose pressed blades on certain treatment occasions, and sometimes you should also choose crushed blades. It is best to use pressed blades for rough treatment, which can reduce treatment costs. The dimensional precision and the sharpness of the pressed blade are worse than those of the grinding blade, but the resistance of the edge of the pressed blade is better, it resists the impact during the rough treatment and can resist a great depth of Cut and power supply. The pressed blade sometimes has a flea groove on the surface of the front blade, which can reduce the cutting force, while reducing friction with parts and chips, reducing power needs.
3. However, the surface of the pressed blade is not as tight as the grinding blade, and the dimensional accuracy is mediocre and the height of each cutting point on the body of the striker varies considerably. Because pressing blades are cheap, they are widely used in production.
4. Large crushed front corner inserts can be used to wet sticky materials (such as stainless steel). Thanks to the shear action of the sharp blade, the friction between the blade and the material of the part is reduced and the chips can quickly leave the front of the blade.
5. In another combination, the pressed blade can be installed in the blade support for most strawberries, then a polished scraper blade is arranged. The scratch blade eliminates rough cutting marks, which can achieve better surface roughness than using only the blade pressure. In addition, using a striped blade can reduce cycle time and cost. Scraping technology is an advanced process that has been widely used in fields of treatment, groove and cutting and drilling.
3. Choice of the body of the striker
The price of strawberries is relatively expensive.
1. First, when you choose a milling cutter, consider its number of teeth. For example, a rough tooth striker with a diameter of 100 mm has only 6 teeth, while a dense dense striker with a diameter of 100 mm can have 8 teeth. The size of the dental pitch will determine the number of tools of tools involved in the cut during grinding, affecting the softness of the cut and the requirements for the cutting rate of machine tools. Each manufacturer of milling strawberries has its own series of dense and dense toothbooks.
2. Moor -tooth strawberries are mainly used for rough treatment because they have larger grooves filled with fleas. If the groove of the chip support is not large enough, it will cause difficulties in rolling the chip or increasing the friction between the chip and the body of the tool and the room. At the same power speed, the tooth cutting load of a rough tooth grinding is greater than that of a dense grinder fragment.
3. The cutting depth during the fine grinding is shallow, generally 0.25 to 0.64 mm, the cutting load per tooth is small (about 0.05 to 0.15 mm) and the power is not large. can choose a larger one. Given that the rate of elimination of fine strawberry metals is always limited, it is normal to have a smaller flea groove in dense dense dense.
4. For pins with large specifications of cones and good rigidity, they can also be roughly crushed with a dense teeth striker. Since dense teeth strawberries also have more teeth involved in the cut, when using a greater cutting depth (1.27 ~ 5 mm), be careful if the power and rigidity of the tool-tool are sufficient and if the groove of the shot chip is large enough. The flea elimination situation must be tested and verified.
5. During the high raw load, the excessive cutting force can cause vibrations of machine tools with poor rigidity. This vibration can lead to the collapse of the carbide blade, thus shortening the lifespan of the tool. Choosing a rough tooth-toothed fragmentation can reduce the food machine feed needs. Therefore, when the specifications of the spindle hole are small (like R-8, 30 #, 40 # conical holes), you can use a rough toothbreath to effectively perform the treatment of milling.
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