According to the titanium alloy processing mechanism analysis, the cutting force of titanium alloy is only slightly higher than that of ordinary steel with the same hardness, but the physical phenomenon of processing titanium alloy is much larger than that of processing steel, making titanium alloy processing difficult.
Defects in titanium machining are caused by thermal conductivity
The "culprit" of titanium alloy's tough to work is "heat!" The heat conductivity of most titanium alloys is 1/7 that of steel and 1/16 that of aluminum. Inoculation occurs during the cutting of titanium alloy, so a large amount of heat is very difficult to agilely conduction to the artifact or taken away by chip, and agglomeration in cutting area, the inoculation of temperature can be as high as 1000 °C above, the accumulation of heat is quite harm, make the cutter blade wear quickly and naturally the devolop tumor, rapid wear the blade, and the cutting area occurs more heat, Further shrinkage tool life.Simultaneously, the high temperature created during the cutting process degrades the appearance integrity of titanium alloy components, resulting in a variety of flaws.
How to Solve Titanium Alloy Processing Technology?
A. Use a blade with a positive angle to reduce cutting force, cutting heat, and workpiece deformation.
B. Connect continuous feed and halt workpiece hardening. During milling, the tool should always be in the feeding condition, and the radial bite ae should be 30% of the radius.
C. High pressure and high flow cutting fluid are acceptable to preserve thermal stability of the processing process and to prevent workpiece deformation and tool damage caused by high temperatures.
D. The sharp, blunt link blade edge of the tool causes heat mobilization and wear, which can lead to tool failure.
E. Try to process the titanium alloy when it is at its softest. Because the material becomes more difficult to treat after hardening, thermal disposal enhances the material's strength while also increasing blade wear.
F. Cut with a big tip radius or chamfering and a larger edge area. This reduces cutting force and heat at each spot, reducing localized damage. In the milling of titanium alloy, the cutting rate has the largest influence on the tool life VC, followed by the radial bite (milling depth).
How to Solve the Item Wear Issue?
The blade groove wear in titanium alloy machining is the local wear on the rear and front along the cutting depth bias, which is frequently produced by the hardening layer left by the early processing. One of the causes of groove wear is the chemical interaction and diffusion of the tool and workpiece material at processing temperatures more than 800°C.
Because of the concentration of titanium molecules in the workpiece at the front of the blade during the cutting process, chip tumors develop easily under high pressure and temperature. When a chip is removed from a blade, the carbide coating is lost, reducing tool life significantly. As a result, proper blade material and form are required for titanium alloy machining.
How to Solve the Tool Layout and Cooling Issues in Titanium Machining?
The heat problem is at the heart of titanium alloy machining; solving the effective loss of heat solves the bigger problem.
To begin with, the selection of appropriate or even imported high-end imported liquid, particularly lubrication and cooling cooling liquid, can quickly and agilely reduce the temperature of the tool and workpiece, but also lubricate, reduce material surface wear, and extend the service life of the tool.
Second, in order to disperse heat fast, a significant volume of high-pressure cutting fluid must be injected accurately on the cutting edge in real time, thus the layout and design of the machining tool are also crucial.
