| 摘要 |
The invention relates to a drilling tool comprising at least one machined groove (1) and at least one web (2). The machined groove and the web extend from a tip of the tool to the shank of the tool. A main cutting edge and an inner cooling channel (3) are formed on each web (2). Said cooling channel extends from the tip of the tool to an opposite drill end and has a continuously extending cross-sectional contour (30) enclosing an imaginary circle (K) with a center point (M). The cross-sectional contour (30) of the inner cooling channel (3) preferably comprises two maximum curvature values whose distance to the drill axis (A) is greater in the direction of a line between the center point (M) and the drill axis (A) or equal to the distance of the center point (M) to the drill axis (A). The invention is characterized in that minimum wall thicknesses (dAUX, dSPX, dSFX) exist between the inner cooling channel (3) and the outer periphery of the drill (7), between the inner cooling channel (3) and the machined surface (5) and between the inner cooling channel (3) and the non-machined surface (6), ranging from a minimum threshold Wmin to a maximum threshold Wmax. The lower and upper thresholds, along with the geometry of the internal cooling channel, are optimized in relation to the through-flow of coolant and to the stability of the tool. |
