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What are the characteristics of titanium alloys? What are the milling parameters for titanium alloy?

The characteristics of titanium alloy:

Gas impurities (such as oxygen, nitrogen, and hydrogen) have a significant impact on the machinability of titanium alloys, as titanium has high chemical reactivity and is easily combined with gas impurities. When the temperature exceeds 600 degrees, titanium is oxidized, forming a brittle layer, known as the "microstructure" α Chemical layer; Generating hydrogen embrittlement with hydrogen; Forming hard and brittle TiN with nitrogen at high temperatures.

Titanium alloy milling parameters:

(1) The main characteristics of titanium alloy cutting processing. Titanium alloy materials have high strength, high thermal strength, small deformation of the cutting layer, severe cold hardening phenomenon, strong affinity with titanium carbide, easy adhesion, and poor thermal conductivity.

(2) Selection of milling cutter materials. The commonly used tool materials for milling titanium alloys are mainly high-speed steel and hard alloy. High speed steel should be selected with drilling, aluminum, and vanadium content. Milling cutter materials commonly include W12Cr4Mo, W2M09Cr4V4C08, W6M05C, r4V2Al, etc; Tungsten drill type (or containing a small amount of other carbides) hard alloys should be selected, with the commonly used grade being YG8. Coated blades and tungsten titanium drill hard alloys are not suitable for use.

(3) Structure and geometric parameters of milling cutters. When milling titanium alloys, it is advisable to use forward milling. During forward milling, due to the thin chips produced by the cutting teeth, they are not easily adhered to the cutting edge. When reverse milling is the opposite, it is easy to stick chips. When the cutter teeth cut people again, the chips are broken, which can easily cause the tool to break. However, during forward milling, due to the small elastic modulus of titanium alloy, there is a phenomenon of tool yielding, which requires the machine tool and tool to have strong rigidity. When milling, the contact length between the tool and the chips is small, making it difficult to roll chips. It is required that the tool has good tooth strength and a large chip holding space. Chip blockage can cause severe tool wear.

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