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Twist drill is the most commonly used hole machining tool. The straight main cutting edge of this type of drill bit is longer. The two main cutting edges are connected by a chisel edge. The chip flute is spiral (for chip removal), and a part of the spiral flute constitutes the rake The rake face, rake face and vertex angle (2¦È) determine the size of the rake angle, so the rake angle of the drill point is not only closely related to the helix angle, but also affected by the inclination of the blade.The structure and geometric parameters of the twist drill are shown in the figure.

D: Diameter ¦Õ: Chisel edge bevel angle ¦Â: Helix angle 2¦È: Apex angle d: Drill core diameter L1: Length of working part

The chisel edge bevel angle ¦Õ is the angle between the chisel edge and the main cutting edge in the end projection. The size of ¦Õ and the length of the chisel edge depend on the relief angle and the top angle of the drill core..When the apex angle is constant, the larger the relief angle, the smaller ¦Õ and the longer the chisel edge (usually control ¦Õ in the range of 50¡ã¡«55¡ã).

The S-blade drill point is also called the Winsland drill point. From the end projection, the chisel point is S-shaped.From the front projection, it can be seen that the middle of the drill tip is slightly bulged, showing a parabolic crown.According to the shape of the parabolic crown and the chisel edge, S-blade drill tips can be basically divided into three types, namely, high-crown S-blade, low-crown S-blade and low-crown small S-blade (see picture).

S-blade drill tip cutting part (L0) is longer, S-blade crown curvature is larger.

Features

Since the cutting part is relatively high (L0 is longer), the negative rake angle is basically eliminated, and even positive cutting can be achieved, so there is no need to add a chisel cutting groove.High grinding efficiency, suitable for grinding thick core drilling tools.However, the tip of the drill tip is relatively weak and has poor strength, which is not suitable for high-speed machining of high-hardness workpieces.The material of the drill point needs to be made of materials with good toughness (such as high-speed steel).

The cutting part (L0) of the drill tip is shorter, and the crown curvature of the S blade is smaller.From the projection direction of the end surface, it can be seen that the chisel edge is a large S shape, and the middle part can be a small straight line. The chisel edge has two small grooves, which can reduce the negative rake angle of the drill tip..

Features<

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