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Définir les paramètres géométriques des outils de tournage et de fraisage en titane pour améliorer la qualité des produits des pièces en alliage de titane. Les produits sont livrés rapidement et à temps.
(1) L'angle de coupe de l'outil γ0: La longueur de contact entre les copeaux en alliage de titane et la face de coupe est courte. Lorsque l'angle de coupe est petit, la zone de contact de la puce peut être augmentée, de sorte que la chaleur et la force de coupe ne soient pas excessivement concentrées près du tranchant. Améliorer les conditions de dissipation thermique, et peut renforcer le tranchant et réduire le risque d'écaillage. Le tournage du titane prend généralement γ0=5°～15°.
(2) The clearance angle α0 of the tool: The processed surface of titanium alloy has large elastic recovery and serious cold hardening. The use of a large relief angle can reduce the friction, adhesion, adhesion, tearing and other phenomena caused to the flank surface, so as to reduce the wear of the flank surface. The relief angle of various cutting titanium alloy tools is basically greater than or equal to 15°.
(3) The leading deflection angle κr and the secondary deflection angle κ´r of the milling tool: When milling titanium alloys, the cutting temperature is high and the elastic deformation tends to be large. When the rigidity of the process system allows, the entering angle should be reduced as much as possible to increase the heat dissipation area of the cutting part and reduce the load per unit length of the cutting edge. En général, κr=30° is used, and κr=45° for rough machining. Reducing the secondary deflection angle can strengthen the tool tip, which is beneficial to heat dissipation and reduces the surface roughness value of the machined surface. Generally take κ´r =10°～15°.
(4) The blade inclination angle of the tool λs: Due to the rough surface and uneven surface structure of the blank, the cutting edge is prone to chipping during rough turning. In order to increase the strength and sharpness of the cutting edge, the sliding speed of the chip should be increased. En général, λs = -3°～-5° is used for rough turning, and λs = O° for fine turning.
(5) The radius of the nose arc of the tool rε: When turning titanium alloy, the tool tip is the weakest part, which is easy to chip and wear, so it needs to grind the tool tip arc. Generally rε=0.5～1.5mm.
Negative chamfering (bγ=0.03～0.05 mm, γ01=-10°～0°) is used during turning, and the arc radius of the bottom of the chip flute is Rn=6～8 mm.
En outre, the quality of tool sharpening is also very important to improve its durability. Carbide cutting tools should be sharpened with diamond grinding wheels. The cutting edge must be sharp when cutting, the surface roughness Ra value of the front and rear cutting faces should be less than 0.4um, and the cutting edge is not allowed to have tiny gaps. After the tool is sharpened and ground, its durability can be increased by 30%.
Design of cutting edge angle for turning and milling titanium