Multifunctional ball endmill

Abstract

The invention discloses a multifunctional ball endmill which includes a cutting portion, an assembly and disassembly portion and a connecting portion for the cutting portion, the assembly and disassembly portion. The cutting portion includes an inner ball cutting edge and at least one pair of outer ball cutting edges. The inner ball cutting edge and a central shaft are cross and are rotatably symmetric with respect to the central shaft, two outer ball cutting edges in each pair of outer ball cutting edges are rotatably symmetric with respect to the central shaft, a radial spacing is reserved between the outer ball cutting edges and the central shaft, a spherical surface formed by the inner ball cutting edge rotating with respect to the central shaft and a spherical surface formed by the outer ball cutting edge rotating with respect to the central shaft are cross, the spherical surface radius of the inner ball cutting edge is r, and the spherical surface radius of the outer ball cuttingedge is R, meeting: 5R<=r<=15R. The spherical surface radius of the inner ball cutting edge is far greater than that of the outer ball cutting edge, and when performing cavity large feeding cutting or flat surface copy milling, the endmill has a low radial load and high cutting efficiency.

Description

Technical field [0001] The invention relates to a metal cutting tool, in particular to a multifunctional ball-end milling cutter. Background technique [0002] General solid carbide ball end mills are mainly used for profiling, cavity and ball groove machining. The cutting part of ordinary ball end mills is mainly composed of ball cutting edges or ball cutting edges and column cutting edges. In order to ensure the ball cutting edge The integrity of the profiling processing capability, when at least one ball cutting edge rotates around the central axis for cutting, the cutting spherical surface is not less than half a spherical surface. In order to make the cutting edge feed of the ball end milling cutter uniform and stable, the single ball cutting edge of the ball end mill adopts a continuous cutting edge structure, and all the ball cutting edges on the ball end mill are distributed around the central axis The diameter of is constant and completely coincides on the same spherica...

AI Technical Summary

Problems solved by technology

Although the structure of the ball end milling cutter is simple, but limited by the process, the single ball cutting edge has constant structural parameters such as rake angle and relief angle.

Since the main cutting part of the ball end milling cutter is the ball end cutting edge part, the ball cutting edge starts from the central axis with zero diameter and ends at the largest diameter column cutting edge, the cutting speed of the ball cutting edge is quite different, especially in the center The cutting line speed is basically zero, and the cutting edge in the central area wears rapidly and is prone to chipping during cutting. The strength of the central cutting edge can be improved by optimizing the parameters such as rake angle and relief angle, but it will lead to a sharp increase in cutting force, Problems such as large vibration and poor surface quality seriously affect the overall performance of the ball end milling cutter, and the failure of the central cutting edge has become the main failure mode of the ball end milling cutter

Therefore, the diameter of the cutting sphere around the center of the ball cutting edge of the ordinary ball end milling cutter is equal to the cutting edge diameter of the ball end milling cutter. In order to reduce the surface residue and ensure the surface quality, only low cutting feed can be used for each machining. Low cutting efficiency

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