A milling cutter made of cemented carbide is called a cemented carbide milling cutter. Cemented carbide is a powder metallurgy product sintered in a vacuum furnace or a hydrogen reduction furnace with cobalt or nickel as a binder and a carbide micron-sized powder of a high-hardness refractory metal as the main component.

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

1. Carbide milling cutter application:

Carbide milling cutters are generally used in CNC machining centers and CNC engraving machines. It can also be installed on an ordinary milling machine to process some relatively hard and uncomplicated heat-treated materials. details as follows:

1. Carbide angle milling cutter: used for milling grooves at a certain angle, there are two types of single-angle and double-angle milling cutters.

2. Carbide face milling cutter: It is used for machining planes on vertical milling machines, face milling machines or gantry milling machines. There are cutter teeth on the end face and circumference, as well as coarse teeth and fine teeth. Its structure has three types: integral type, insert type and indexable type.

3. Carbide three-sided milling cutter: It is used to process various grooves and stepped surfaces, and there are cutter teeth on both sides and on the circumference.

4. Carbide end mills: used for machining grooves and stepped surfaces, etc., the cutter teeth are on the circumference and end faces, and cannot be fed in the axial direction during work. Axial feed is possible when the end mill has end teeth that pass through the center.

5. Carbide cylindrical milling cutter: used for machining planes on horizontal milling machines. The cutter teeth are distributed on the circumference of the milling cutter, and can be divided into two types: straight teeth and helical teeth according to the tooth shape. According to the number of teeth, it can be divided into two types: coarse teeth and fine teeth. The helical-toothed coarse-tooth milling cutter has a small number of teeth, and the tooth strength is high, the chip space is large, and it is suitable for rough machining; the fine-toothed milling cutter is suitable for finishing.

2. Carbide milling cutter milling method

The feed direction of the carbide milling cutter relative to the workpiece and the rotation direction of the milling cutter mainly include the following two milling methods:

1. Climb milling. The direction of rotation of the milling cutter is the same as the feed direction of the cutting, and the milling cutter bites the workpiece and cuts off the last chip at the beginning of the cut.

2. Up-cut milling. The rotation direction of the milling cutter is opposite to the feeding direction of the cutting. The milling cutter must slip on the workpiece for a period before starting to cut, starting with the cutting thickness at zero, and reaching the maximum cutting thickness at the end of the cutting.

During down milling, the cutting force presses the workpiece toward the worktable, and during up milling, the cutting force causes the workpiece to leave the worktable. Since the cutting effect of down milling is the best, down milling is usually selected. Only when the machine tool has a thread clearance problem or a problem that cannot be solved by down milling, can up milling be considered.

3. Carbide milling cutter maintenance

When the axis line of the carbide milling cutter coincides with the edge line of the workpiece or is close to the edge line of the workpiece, the operator should do the following equipment maintenance work:

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

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

3. Use the correct milling cutter pitch for the process to ensure that there are not too many blades meshing with the workpiece at the same time to cause vibration. On the other hand, when milling narrow workpieces or milling cavities, make sure that there are enough The blade engages with the workpiece.

4. Ensure that the feed per insert is used so that the correct cutting effect can be obtained when the chip is thick enough, thereby reducing the wear on the tool. Indexable inserts with positive geometries for smooth cutting results and minimal power.

5. Select the diameter of the milling cutter suitable for the width of the workpiece.

6. Select the correct main declination angle.

7. The placement of the milling cutter should be correct.

8. Use cutting fluid only when necessary.

4. Carbide milling cutter selection

In addition to end mills, some end mills and cemented carbide as milling cutter materials for milling stainless steel, other types of milling cutters are generally made of high-speed steel, especially tungsten, molybdenum and high-vanadium high-speed steel, which have good results. The durability is 1-2 times higher than that of W18Cr4V. Carbide grades suitable for making stainless steel milling cutters are: YG8, YW2, 813, 798, YS2T, YS30, etc.

The adhesion and fusion of stainless steel are strong, and the chips are easy to adhere to the cutting edge of the milling cutter, which deteriorates the cutting conditions; during up milling, the cutting edge slides on the hardened surface first, which increases the tendency of work hardening; milling When the impact and vibration are large, the cutting edge of the milling cutter is easy to chip and wear.

The corrugated edge end mill is used to process stainless steel pipes or thin-walled parts. High-speed milling with carbide end mills and milling of stainless steel with indexable end mills can achieve good results.

When milling stainless steel, the down milling method should be used as much as possible. The asymmetric down milling method can ensure that the cutting edge is smoothly cut away 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 rake face when the cutter teeth re-cut into the workpiece. The phenomenon of spalling and chipping increases the durability of the tool.