The main cutting edges of the cemented carbide tools are distributed on the cylindrical or conical surface, the end cutting edge is the secondary cutting edge, and the milling cutter axis is perpendicular to the processing surface. According to the material of the cutter teeth, it can be divided into two categories: high-speed steel and cemented carbide. Most of them adopt nested insert structure, and the cutter body material is 40Cr.
Compared with high-speed steel milling cutters, cemented carbide cutters have higher milling speed and better surface quality, and can process workpieces with hard skin and hardened layers, so they have been widely used. According to the different installation methods of blades and teeth, cemented carbide tools can be divided into three types: integral type, machine clamp welding type and indexable type.
Carbide cutting tools are mainly used for vertical milling machines or horizontal milling machines to process step surfaces and planes, and are especially suitable for processing larger planes. The face milling cutter with the main deflection angle of 90° can mill the stepped surface with a wider bottom.
Carbide tools use face milling cutters to machine planes. At the same time, there are many cutting teeth and the auxiliary cutting edge has a polishing function, which makes the surface roughness value of the machined small. Therefore, it can use a large number of cutting, high productivity and wide application. Due to the reduction of alloy tools required in the machining process, the entire production process is speeded up.
As the main category of cemented carbide products, cemented carbide tools mainly use cemented carbide materials, which can form good geometric dimensions during the grinding process and improve the surface quality of the parts. The grooves of cemented carbide tools can be rotated, and can also be directly ground with ordinary round milling cutters or conical milling cutters. Both left-hand and right-handed tools have the functions of left-hand grinding or right-hand grinding. The core thickness can be programmed by a loop or variable.
In addition, the user can also use the shearing angle cutter to grind, which is especially suitable for grinding welding materials of high-speed steel bars and cemented carbide steel plates, but not suitable for grinding all cemented carbide steel bars.
Because the position of the welded steel plate is uncertain, it needs to be determined before the carbide tool is ground. The correct space trajectory of the clamping surface grinding should be calculated, and the grinding of the relief angle should be determined according to the relevant trajectory to ensure that the required profile reaches a high level. Precision grinding effect.
When processing the back angle with alloy tools, cup grinding wheels, drill point grinding wheels, fillet grinding wheels and external round grinding wheels can be used for grinding as required. Usually the secondary cutting edge can also be used to grind the relief angle along the cutting edge. Another method is to use a continuous relief angle trajectory to machine the relief angle through rotary grinding.