(7) Using VF-MD right-angle end mill to simultaneously machine the side and bottom surface of hardened steel with hardness up to HRC60, the cutting is stable, and good surface quality can be obtained. The chip shape and color are normal, and the cutting speed is 151m/min. The feed amount was 0.1 mm/tooth, and the bottom edge resistance was good and the outer peripheral edge was excellent in abrasion resistance.
(8) With the circular end mill VF-MDRB, the cutting speed is 50m/min, the feed per tooth is 0.05mm/tooth, the depth of cut is 0.5mm, and the width is 8mm. SKDII (60HRC) is processed, and the air is cooled. After cutting the length of 8 meters, the tool is almost harmless.
End mill hard alloy particles ultra-fine
The end mill cutter teeth are repeatedly subjected to impact loads during processing, so they must have sufficient toughness. When cutting hardened materials, the cutting force is large, and the toughness should be improved. Nowadays, the hardness of the coating is getting higher and higher, the coating guarantees the wear resistance of the tool when cutting hardened steel, and the machinability and toughness are more guaranteed by the base material. The base material of the coated carbide end mill is mainly a K-type hard alloy with high toughness and good vibration resistance (the main component is WC). In order to improve the toughness, the WC crystal grains are refined, and the harder the coating surface is, the more the grain of the matrix is ​​refined, and the performance of the hardened steel is higher. The Impact Miracle coated substrate has a grain size of less than 1 μm, which increases both wear resistance and toughness.
In order to adapt to the hardened steel processing, the improvement of the end mill structure
(1) Improvement of the structure of the ball end mill: the two main blades are formed at the center of the top edge to avoid the generation of the chisel edge to reduce the cutting force, improve the cutting performance of the center part, eliminate the crowding phenomenon, and facilitate the formation and elimination of the chip. The ball edge and the peripheral edge should be smoothly transitioned without any seams.
(2) Improvement of the right-angle end mill and the arc-end end mill on the bottom edge: the bottom edge position is staggered, which is easy to manufacture, improves the cutting condition at the center of the bottom edge; and improves the groove shape to facilitate chip removal; Rounding improves the breakage resistance of the cutting edge to accommodate cutting high hardness materials.
(3) In order to improve the life and enhance the rigidity, the VF-2SSB short-edge end mill is specially designed, and the total length is also short. It is an end mill suitable for the sleeve clamping shank.
(4) In order to achieve the “milling and grinding†and achieve high precision of grinding, the accuracy of the end mill itself must be improved. Mitsubishi's high-precision ball end mill has a ball nose radius R accuracy of ±0.002mm and a diameter accuracy of 0-0.01mm. The circular arc R of the arc end mill has a precision of 0 to ±0.01 mm. If the entire batch of end mill products are divided into several groups according to the dimensional tolerance within the range of diameter tolerance, the grouping dimensional tolerance will be reduced, and the precision of each group of end mills can be improved. With such high precision end mills, The side of the processing die can achieve a high precision of ±0.005mm, which enables the high-precision and high-precision machining of the mold with the end mill, completely eliminating the grinding process.
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