The alloy high feed end mill is a multi-cutting edge tool, and the number of teeth (z) can be changed. There are some elements that can help determine the pitch or number of teeth for different types of machining. Data, workpiece size, overall stability, overhang size, appearance quality requirements and available power are the factors related to processing. The elements related to the tool include sufficient feed per tooth, at least two teeth cutting together, and the chip capacity of the tool, which are only a small part of it.
The tooth pitch (u) of the high feed end mill is the distance from a point on the cutting edge of the blade to the same point on the next cutting edge. High feed end mill is divided into sparse, dense and super dense pitch high feed end mill. The close pitch means that there are more teeth and appropriate chip space, which can be cut with a high metal removal rate. Generally used for medium load milling of cast iron and steel. The close pitch is a general-purpose milling cutter and recommended for mixed production.
Sparse tooth pitch means that there are fewer teeth and a large chip space on the circumference of the milling cutter. Sparse pitch is often used for rough machining to finish machining of steel, and oscillation in steel machining has a great influence on the machining result. Sparse pitch is a problem solving solution, it is long overhang milling, low-power machine tools or other applications to reduce cutting force.
The chip space of the ultra-close pitch tool is very small, and it can use a higher table feed. These tools are suitable for continuous cast iron surface cutting, cast iron rough machining and small margin cutting of steel, such as side milling. They are also suitable for applications that insist on low cutting speeds. The high feed end mill can also have uniform or unequal tooth pitch. The latter refers to the unequal distance of the teeth on the tool, which is also an effective way to deal with the problem of oscillation.
When there is an oscillation problem, use the high feed end mill with sparse teeth and unequal pitch as much as possible. Since there are fewer blades, the possibility of increased oscillation is less. A small tool diameter can also improve this situation.
The above is the analysis of the reasons why some milling cutters have different tooth pitches. I hope you have some understanding.
