Aviation difficult to process materials and parts cutting technology is a complex system engineering.On the choice of tools, should be a reasonable choice with the machined parts in the mechanical properties, chemical properties, physical properties to match the new and efficient tool aircraft difficult to machine materials and parts Cutting technology is a complex system engineering.On the choice of tools, new and efficient tools that match the mechanical properties, chemical properties and physical properties of the machined parts should be selected reasonably.High speed steel tools with excellent performance, hard Alloy coated knives, ceramics and superhard materials Cutting tools are the first choice for efficient cutting of aerospace hard-to-machine materials.
The following is a successful case of aviation parts processing:
(1) Processing of a nickel base superalloy GH4169 ring, which is equivalent to the American material grade Inconel718 with a hardness of 35 to 47 HRC, a linear speed of 400 m / min, a feed rate of 0.25 mm / r and a depth of cut of 1.6 mm. Knife, the use of oblique cutting new technology, that is, in the cutting process gradually reduce the depth of cut, the effect is very good, not only minor blade wear, blade shape intact, but also to achieve efficient cutting, to ensure the processing quality.
(2) A machine casing parts, material for the GH2132. Solution and aging after high hardness. The cutting temperature of the material, the tendency of work hardening, hardening of the cutting depth of up to 0.05mm, to the cutting process brought Adverse effects.High strength material, plasticity and toughness, the surface residual stress.Cutting should be a reasonable choice of cutting depth and feed rate, the cutting edge below the hardened layer cutting, otherwise it will speed up the tool wear.Compared with the diameter of the part Large, thin wall thickness, parts rigidity is not strong, leading to increased cutting force, vibration occurs in the processing, causing parts deformation, parts surface prone to oscillation ripple in the cutting test according to the workpiece cut depth of multiple stratification .
Test equipment: five-coordinate CNC milling machine, spindle speed of the machine up to 1800r / min, feed rate of 500 ~ 700mm / min.
Test tool: The overall carbide end mill, diameter 12mm, equidistant 4 teeth, the main declination angle 90º, handle diameter 12mm, helix angle 45º, blade length 26mm, length 75mm, TiALN coating, using high pressure cooling 45º helix angle can effectively increase the chip space, milling cutter and helix angle is reasonable optimization, reducing the cutting force, extending tool life, the surface quality of parts meet the technical requirements.