Double-arc irregular shaped inner-cooling type efficient titanium alloy milling tool

Abstract

The invention relates to a double-arc irregular shaped inner-cooling type efficient titanium alloy milling tool. High processing difficulty, low cutting efficiency and short service life of a tool are caused by the mutual influence of physical, chemical and mechanical properties of titanium alloy, so that the titanium alloy becomes a typical difficultly processed material. The double-arc irregular shaped inner-cooling type efficient titanium alloy milling tool comprises a tool handle (1), wherein the tool handle (1) is transited to a milling tool bit with a double-arc shape at the front end through a cone (2); a pair of chip pockets (6) with front angle structures are arranged on one side of the tool bit; a cooling liquid channel (5) is arranged at the center of the tool; an outlet of the cooling liquid channel is located on the end part of the tool; and a negative chamfered edge (7) is arranged on the tail part of the tool. The invention is applied to the milling tool.

Description

technical field [0001] The invention relates to a milling tool. Background technique [0002] Due to the interaction of physical, chemical and mechanical properties of titanium alloy, it is difficult to process, low cutting efficiency and short tool life, making it a typical difficult-to-machine material. Its main cutting features are as follows: [0003] (1) The contact area between the chips and the rake face is small, the tool tip stress is large, and the temperature is high, which makes the tool tip and cutting edge easy to wear. [0004] (2) The coefficient of friction is large. Under the same conditions, titanium alloy materials have a larger friction coefficient than ordinary carbon steel, and the friction work done by chips flowing through the rake face is large, resulting in higher friction interface temperature and making the tool easy to wear. [0005] (3) High chemical activity. The chemical activity of titanium alloy is very high at high temperature, and it ...

AI Technical Summary

Problems solved by technology

[0003] (1) The contact area between the chip and the rake face is small, the tool tip stress is large, and the temperature is high, which makes the tool tip and cutting edge easy to wear

[0004] (2) Large coefficient of friction

The chemical activity of titanium alloy is very high at high temperature, and it can chemically react with oxygen, nitrogen and water vapor in the air to form a hardened layer on the surface of titanium alloy, resulting in a substantial increase in the hardness of the workpiece, while reducing the plasticity of the workpiece and making the chip and the former The contact length of the tool face is further reduced, leading to faster tool wear

[0006] (4) Low thermal conductivity

The thermal conductivity of titanium alloy is only 1 / 5 of that of iron and 1 / 14 of that of aluminum. In addition, the contact length between the tool and the chips is short, so that the cutting heat accumulates in a small area near the cutting edge and is not easy to dissipate, resulting in excessive temperature of the tool. Accelerated tool wear

[0007] (5) Small modulus of elasticity

Due to the small elastic modulus and large yield ratio of titanium alloy, the machined surface of the workpiece is prone to rebound during the cutting process, which will easily cause the flank wear of the tool to increase and the workpiece to deform

[0008] (6) Higher requirements for machine tools

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