What is a Carbide End Mill?

Carbide milling cutter refers to a milling cutter made of cemented carbide. To understand cemented carbide milling cutters, we must first know what is cemented carbide. Cemented carbide is based on carbide (WC, TiC) micron powder of high hardness and refractory metal, and it is made of cobalt (Co) or nickel (Ni). Molybdenum (Mo) is a powder metallurgical product sintered in a vacuum furnace or a hydrogen reduction furnace as a binder.

Carbide milling cutter

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Cemented carbide

Carbide milling cutters are mainly divided into: solid carbide milling cutters, carbide straight shank slot milling cutters, carbide saw blade milling cutters, cemented carbide spiral milling cutters, cemented carbide reamer milling cutters. Carbide end mills. Carbide ball end mills

Carbide milling cutter uses:

Carbide milling cutters are mainly used in

When the axis of the carbide milling cutter coincides with the edge line of the workpiece or approaches the edge line of the workpiece, the situation will be very serious. The operator should do the relevant equipment maintenance work:

1. Check the power and stiffness of the machine to ensure that the required cutter diameter can be used on the machine.

2. The overhang of the tool on the spindle is as short as possible to reduce the impact of the milling cutter axis and the workpiece position on the impact load.

3 Use the correct milling cutter pitch suitable for this process to ensure that there are not too many inserts engaged with the workpiece during the cutting to cause vibration. On the other hand, ensure that there are sufficient inserts when milling narrow workpieces or milling cavities. Engage with the workpiece.

4 Make sure that the feed per blade is used so that the correct cutting results are obtained when the chips are thick enough to reduce tool wear. Indexable inserts with positive rake grooves for smooth cutting results and lowest power.

5. Choose a cutter diameter suitable for the width of the workpiece.

6. Use the correct main declination.

7. Place the milling cutter correctly.

8. Use cutting fluids only when necessary.

9. Follow tool maintenance and repair rules and monitor tool wear.

Doing a good job of maintaining the carbide milling cutter can prolong the service life of the cutter and improve the work efficiency.

Milling stainless steel except for end mills and some end mills and hard alloys as milling cutter materials, other types of milling cutters are made of high-speed steel, especially tungsten-molybdenum-based and high-vanadium high-speed steel. Durability can be increased by 1 to 2 times than W18Cr4V. Carbide grades suitable for stainless steel milling cutters include YG8, YW2, 813, 798, YS2T, YS30, YS25 and so on.

The spray cooling method has the most significant effect, which can increase the durability of the milling cutter by more than double; if it is cooled with a general 10% emulsion, the cutting fluid flow should be fully cooled. When milling stainless steel with a carbide milling cutter, Vc = 70 150m / min and Vf = 37.5 150mm / min. At the same time, it should be appropriately adjusted according to the different alloy grades and workpiece materials.

Stainless steel has strong adhesion and fusing properties, and chips easily adhere to the cutting edge of the milling cutter, which deteriorates the cutting conditions. During reverse milling, the cutting edge slides on the hardened surface first, increasing the tendency of work hardening. Impact during milling 2. The vibration is large, which makes the milling cutter blade easy to chip and wear.

When milling stainless steel, the cutting edge must be sharp and able to withstand impact, and the chip flute must be large. Large helix milling cutters (cylindrical milling cutters, end milling cutters) can be used. The helix angle b is increased from 20 ° to 45 ° (gn = 5 °). The rake angle g0e is increased from 11 ° to more than 27 °, and milling is light. However, the b value should not be too large, especially b35 ° for end milling cutters, so as not to weaken the cutter teeth.

Wave-shaped end mills are used to process stainless steel pipes or thin-walled parts. The cutting is quick, the vibration is small, the chips are brittle, and the workpiece is not deformed. High-speed milling with carbide end mills and stainless steel with indexable end mills can achieve good results.

1Cr18Ni9Ti is milled with a silver white chip end mill. Its geometric parameters are gf = 5 °, gp = 15 °, af = 15 °, ap = 5 °, kr = 55 °, kr = 35 °, g01 = -30 ° , Bg = 0.4mm, re = 6mm, when Vc = 50 90m / min, Vf = 630 750mm / min, ap = 2 6mm, and the feed per tooth reaches 0.4 0.8mm, the milling force is reduced It is 10% to 15% smaller, the milling power is reduced by 44%, and the efficiency is also greatly improved. The principle is to grind negative chamfers on the main cutting edge, artificially generate chipping edge during milling, and make it replace the cutting edge for cutting. The rake angle gb of the chipping edge can reach 20 ~~ 302. As a result, the chipping tumor is driven by a thrust force parallel to the cutting edge generated on a rake face and becomes a secondary chip outflow, thereby taking away the cutting heat and reducing the cutting temperature.

When milling stainless steel, down milling should be used whenever possible. The asymmetrical down milling method can ensure that the cutting edge is smoothly cut from the metal, the chip bonding contact area is small, and it is easy to be thrown off under the action of high-speed centrifugal force, so as to avoid the impact of the chip on the cutting surface when the cutter teeth re-cut into the workpiece Peeling and chipping increase tool durability.

Stainless steel materials are widely used and can be encountered in turning, milling, drilling, and tapping. But because stainless steel has different characteristics from other general materials, processing stainless steel has become a major problem for technicians!