Characteristics of Titanium Alloy Parts in Cutting Process

Titanium alloy has the advantages of good corrosion resistance, high strength and stable mechanical performance, so it is also an ideal manufacturing material for aircraft and engine. However, there are several aspects in the cutting process that we need to pay attention to. The following chapters will give you a detailed description:

1. General alloy steel processing does not use forward milling. Because of the influence of clearance between screw and nut of machine tool, the milling cutter acts on the workpiece in forward milling. The force in the feed direction is the same as that in the feed direction. It is easy to cause clearance movement of workpiece table, resulting in tool hitting. For forward milling, the cutter teeth meet hard skin at the beginning of cutting, which leads to tool breakage.

Secondly, because the reverse milling chips are thin to thick, the tool is easy to dry friction with the workpiece at the initial cut-in, which aggravates the sticky chips and chips of the tool. As far as titanium alloy is concerned, the latter contradiction is more prominent.

3. Tool wear is not serious when titanium alloy reamers are reamed. Carbide and high speed steel reamers can be used. Factory commonly used W18Cr4V, M42, YW1, YG8, YG10HT and so on. When using cemented carbide reamer, the rigidity of process system similar to drilling should be adopted to prevent reamer from breaking edge. The main problem in reaming of titanium alloy is that the reaming hole is not smooth. The following measures can be taken: narrowing the reamer blade bandwidth with asphalt to avoid bonding between the edge band and the hole wall, but to ensure sufficient strength, the general edge width is 0.1-0.15 mm.

Fourthly, according to the properties of titanium alloy parts and the characteristics of cutting process, the following aspects should be considered in processing:

1. To increase the contact length between chip and rake face and reduce the friction between workpiece and rake face, smaller rake angle and larger rear angle are adopted. The arc transition edge is used to improve the strength of tool tip and avoid sharp corner burning and edge collapse. Keep the blade sharp to ensure smooth debris discharge and avoid sticky debris avalanche.

2. Cutting speed should be low in order to avoid excessive cutting temperature; moderate feed, too large burnable knife, too small because of the cutting edge working in the hardening layer and wearing too fast; cutting depth can be large, so that the tool tip works below the hardening layer, which is conducive to improving tool durability.

3. The cutting resistance of titanium alloy parts is relatively large, so the process system needs to ensure sufficient stiffness. Because the titanium alloy is easy to deform, the cutting clamping force can not be large, especially in some finishing processes, when necessary, some auxiliary support can be used.

The above is about the characteristics of titanium alloy parts processing in the cutting process, which is a general principle to be considered in the processing; however, if under different conditions or with different processing methods, the problems to be solved are not the same; if there are other things you want to know, please call us for advice.