The milling of titanium alloy parts is the same as other difficult-to-machine materials, because the cutting speed of the tool will increase due to a small increase in cutting speed.
The difference is that due to the high strength and high viscosity of the titanium alloy, it is easier to generate and accumulate heat in the cutting area during cutting, coupled with poor thermal conductivity, there is a risk of burning when milling with a large amount of cutting. This is why milling titanium alloy parts must not choose high cutting speeds.
However, the processing speed of titanium alloy parts can still be increased. That is, when the cutting speed remains unchanged, the processing speed of the part is increased by increasing the metal removal rate. Achieving this goal does not include the use of higher power or high-end machine tools, but the equipment can fully utilize the existing
The cutting tool of the machine tool can also compensate for some shortcomings of the machine tool, such as poor rigidity.
First, titanium alloys are mainly used for high-end parts, not only for manufacturing aircraft fuselage and engine parts, but also for manufacturing many parts in medical equipment. Especially for some growth
Another reason is that not every workshop can achieve high feed speed processing, so when titanium alloy milling is difficult to process materials, or when the cutting speed is not high during processing, what way to achieve high efficiency processing has become an urgent need The problems solved have aroused great attention from manufacturers.
Choose the right choice of cutting tool materials using high toughness cutting tools will be the first important issue to achieve efficient milling of titanium alloys. Cemented carbide tools can be the right choice, and machine shops are often accustomed to using cemented carbide as the best cutting tool material, especially in almost all difficult machining, usually carbide. For titanium alloy processing, a new generation of high-speed steel will be a good substitute for cemented carbide.
It stands to reason that carbide cutting tools with good wear resistance can implement high cutting speeds at reasonable processing costs. But this reasonable processing cost is based on the premise that the tool must have “high toughness” or resistance to impact and fracture. But unfortunately it is usually used
‘S hard alloy is much more brittle than high-speed steel.
This is very important in milling titanium alloys. Generally speaking, the main reason for the failure of cemented carbide tools is not the wear of the cutting edge, but the fracture of the blade body. Secondly, the increase in cutting heat during the milling of titanium alloys also prevents cemented carbide tools from taking advantage of high cutting speeds. Because machining at a high cutting speed requires the addition of a large amount of coolant, under the alternating effect of heat and cold, a strong thermal shock is generated between the tool and the workpiece, which will quickly cause the brittle carbide tool cutting edge broken. Both of the above technical problems need to be solved by the inherent high toughness of the tool itself. But ordinary cemented carbide tools are far from competent. The cutting test proves that using a high-toughness tool, such as milling a titanium alloy workpiece with a high-speed steel tool, there is no need to worry about the impact of the cutting and the cutting edge cracking. Especially when machining on less rigid machine tools, high-toughness high-speed steel tools can achieve high metal cutting rates by increasing the cutting depth rather than by increasing the cutting speed.
Not only that, but also can provide a wide range of high toughness high speed steel tool materials for users to choose. Most workshops do not know this. They also do not know that the high-speed steel cutters on the market can also go through some special processing procedures, such as the implementation of a
high-speed steel smelting (such as increasing cobalt content) for heat treatment (multiple graded quenching and tempering), or strictly controlling the manufacturing process of high-speed steel materials to make powder metallurgy high-speed steel with uniform metallographic structure. Therefore, expensive high-cobalt high-speed steel and powder metallurgy high-speed steel are ideal tool materials for efficient milling of titanium alloys.
Control of high cutting temperature
Sometimes you can also choose cemented carbide cutting tools, using a small radial cutting method to cut titanium alloy parts, can achieve amazing high speed (see “10% and 100%” section). In these cuttings, the tool must not only solve the problem of wear resistance in general, but especially the high-cutting
The problem of wear resistance of cutting tools at cutting temperature is very important. It needs to be processed with coated carbide cutting tools.