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Load-bearing titanium alloy cutting technology with internal cooling

Titanium is a metal that we encounter on many occasions in our lives.In medicine, titanium has become indispensable for joint and dental implants;In aviation, the carrier parts are made of titanium.Titanium alloys have the same strength as steel, but weigh only half as much, and are remarkably resilient and do not brittle at low temperatures.However, in the course of cutting operations, titanium alloys will reveal certain defects, which will lead to increased processing and tool costs.

Titanium alloy is a very poor conductor of heat, compared to steel, its coefficient is 10.During the cutting process, 75% of the heat generated by the machining is transmitted to the tool and is not removed with the chip.In order to solve this problem, people need to use a kind of hard metal material with high heat resistance, and take effective cooling measures during processing.This will result in the use of a large amount of coolant, preferably at high pressure through the main shaft directly into the cutting surface.Therefore, for titanium alloy cutting operations, with internal cooling bearing tool has become a preferred product.

Another consequence of this poor thermal conductivity of titanium alloys is the generation of high temperatures on cutting tools.It produces chemical reactions such as oxidation and diffusion on the blade surface.

Through a lot of cold deformation, titanium tends to harden very strongly, tripling its tensile strength and reducing its breaking force by up to 90%.The tendency to harden causes the cutting process to encounter significant resistance: the cutting edge is prone to breakage or damage to the cutting material.The cutting force can be reduced by a sharp blade, thus achieving a certain compensation, but this measure should not be excessive, otherwise the blade will become too fragile.

Many of the components used in the aerospace industry are made of cast titanium alloys.The surface hardness of these parts is not uniform, so the load level for the transposing blade is unpredictable.Ceratizit, with a special heat-resistant coating composite called hyper-coat, solves this problem well.Behind it lurks an ISO P and M35 class hard metal material and a coating designed for such applications.The new hard metal is called the CTP5240.

This material is a kind of medium grain hard metal material with high heat resistance. It combines high wear resistance, enough flexibility and high heat resistance.Coating makes the workpiece material such as oxidation and diffusion of chemical reaction trend significantly weakened, it has excellent friction characteristics, thermal stability, high hardness.

At the same time, this coating also produces an effective thermal protective layer that protects hard metal materials from premature wear at higher cutting speeds.In addition, the coating material has undergone special surface treatment, it can achieve a very smooth cutting surface, which can greatly reduce the friction coefficient in the cutting process.

In the shape of the CTP5240 blade, Ceratizit has achieved a high, sharp design.This geometry allows for good cutting results at low cutting forces and pressures.Therefore, the processing temperature can be maintained in 200~250℃ for a long time.Other characteristics of the blade are that it also has a good cutting shape and effective chip discharge.This geometry contributes to efficient chip removal by having a good cutting profile, as the amount of chips is always kept low.Due to the good combination of geometry and material variety, cutting speed of 120m/min, feed of 0.12mm and axial cutting depth of 6mm can be achieved during rough machining.

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