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Selection of milling cutter blades


Selection of milling cutter blades

1. For finishing milling, the best choice is grinding blade. This kind of insert has better dimensional accuracy, so the positioning accuracy of the cutting edge in milling is higher, and better processing accuracy and surface roughness can be obtained. In addition, the development trend of grinding milling inserts used in finishing is to grind out chip grooves to form large positive rake cutting edges, which allow the inserts to be cut at small feed and small cutting depth. When carbide blades without sharp rake angle are processed by small feed and small cutting, the tool tip rubs against the workpiece and the tool life is short.

2. It is more appropriate to select pressing blade in some processing occasions. Sometimes it is also necessary to choose grinding blade. The best choice for rough processing is the compacted blade, which can reduce the processing cost. The dimension accuracy and edge sharpness of the compacted blade are worse than those of the grinding blade, but the edge strength of the compacted blade is better, and it can withstand impact and larger cutting depth and feed during roughing. Compressed blades sometimes have chip grooves on the rake face, which can reduce cutting force and friction with workpieces and chips, and reduce power demand.

3. However, the surface of the pressed blade is not as close as that of the grinded blade, and the dimension accuracy is poor. The height of each tool tip on the milling cutter body is quite different. Because the pressing blade is cheap, it is widely used in production.

4. Grinded large rake blades can be used to milling viscous materials (such as stainless steel). Through the shearing action of the sharp blade, the friction between the blade and the workpiece material is reduced, and the chip can leave from the front of the blade quickly.

5. As another combination, the pressing blade can be installed in the blade base of most milling cutters, and then a polished blade can be disposed. Scraping blade can get better surface roughness than pressing blade only. Moreover, the application of scraper blade can reduce cycle time and cost. Scraping technology is an advanced technology, which has been widely used in turning, slot cutting and drilling.

The selection of milling cutter body can make the efficiency of machining order more efficient than half the effort.

Milling cutters are expensive. A face milling cutter with a diameter of 100 mm may cost more than 600 dollars. Therefore, careful selection should be made to meet the specific processing needs.

1. First of all, when choosing a milling cutter, the number of teeth should be considered. For example, a rough-tooth milling cutter with a diameter of 100 mm has only six teeth, while a compact-tooth milling cutter with a diameter of 100 mm has eight teeth. The size of tooth spacing will determine the number of cutter teeth involved in milling at the same time, which will affect the stability of cutting and the requirement of machine tool cutting rate. Each milling cutter manufacturer has its own series of rough and dense surface milling cutters.

2. Coarse-toothed milling cutters are mostly used for rough machining because they have larger chip grooves. If the chip groove is not large enough, it will cause the difficulty of scrap rolling or the friction between the chip and the cutter body and the workpiece will intensify. At the same feed speed, the cutting load per tooth of rough-tooth milling cutter is larger than that of dense-tooth milling cutter.

3. When finishing milling, the cutting depth is relatively shallow, generally 0.25-0.64 mm, the cutting load of each tooth is small (about 0.05-0.15 mm), and the power required is not large. Dense-tooth milling cutter can be selected, and larger feed can be selected. Because the metal removal rate is always limited in finishing milling, it's no harm to have smaller chip grooves in dense-tooth milling cutters.

4. For the spindle with bigger taper hole size and better rigidity, dense-tooth milling cutter can also be used for rough milling. Because dense-tooth milling cutters have more teeth involved in cutting at the same time, when using a larger cutting depth (1.27-5mm), attention should be paid to whether the power and rigidity of the machine tool are enough, and whether the chip-holding groove of the milling cutter is large enough. Chip removal needs to be tested and verified. If there is a problem with chip removal, the cutting parameters should be adjusted in time.

5. In heavy-duty rough milling, excessive cutting force can cause chatter of machine tools with poor rigidity. This kind of chatter will cause the carbide blade to collapse, thus shortening the tool life. Choosing rough-tooth milling cutter can reduce the requirement of machine tool power. Therefore, when the size of spindle hole is small (such as R-8, 30, 40),the rough tooth milling cutter can be effectively used for milling.

milling tool head

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