The HRC55 end mill carbide tools mainly have the following two milling methods relative to the feed direction of the workpiece and the rotation direction of the milling cutter:

The first type is down milling. The rotation direction of the milling cutter is the same as the cutting feed direction. When the cutting starts, the milling cutter bites the workpiece and cuts off the final chips.
The second type is up-milling. The rotation direction of the milling cutter is opposite to the cutting feed direction. The manufacturer of HRC55 end mill carbide tools tells you that the milling cutter must slide a section on the workpiece before starting to cut, starting with the cutting thickness as zero. , The cutting thickness reaches the maximum at the end of cutting.
During down milling, the cutting force presses the work piece against the worktable, and during up milling, the cutting force pushes the work piece away from the worktable. Because the cutting effect of down milling is the best, down milling is usually the first choice, and only when the machine has thread clearance problems or problems that cannot be solved by down milling, then up milling is considered.
Every time the HRC55 end mill carbide tools inserts into the cutting, the cutting edge must bear an impact load. The load depends on the cross section of the chip, the workpiece material and the cutting type. Under ideal conditions, the diameter of the milling cutter should be larger than the width of the workpiece, and the axis of the milling cutter should always be slightly away from the centerline of the workpiece. When the tool is placed directly at the cutting center, it is very easy to produce burrs. The manufacturer of HRC55 end mill carbide tools tells you that the direction of the radial cutting force when the cutting edge enters and exits cutting will continue to change, the machine tool spindle may vibrate and be damaged, the blade may be chipped and the machining surface will be very rough, HRC55 end mill carbide tools Slightly off-center, the cutting force direction will no longer fluctuate, and the milling cutter will gain a kind of preload.