Four-tip and eight-edge drill bit without chisel edge
A technology without chisel edge and drill bit, which is used in drilling repairs, drilling tool accessories, drilling/drilling equipment, etc., can solve the problems of low efficiency and resistance of brittle metal materials, reduce operation difficulty, eliminate resistance, improve The effect of work efficiency
Inactive Publication Date: 2013-01-30
SUZHOU INDAL PARK INSTITUE OF VOCATIONAL TECH
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Problems solved by technology
[0002] The existing high-speed steel twist drill bit, its main body includes a cutter body and a cutter head, the cutter body is provided with a spiral groove as a chip removal groove, and the cutting part on the cutter head includes two symmetrical cutting edges, between the symmetrical cutting edges is Chisel edge, the main resistance in drilling comes from the chisel edge, so it is inefficient when drilling brittle metal materials
[0003] The existing basic group drills are three-pointed and seven-edged, and its cutting speed of brittle metal materials is 2 to 3 times higher than that of the above-mentioned ordinary twist drills, but its chisel edge is shorter than that of ordinary twist drills, but there is still resistance
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[0012] Such as figure 1 , figure 2 The present embodiment shown is a four-pointed and eight-edged non-chisel drill bit, between the two circular arc edges of the three-pointed and seven-edged basic group drill bit, that is, the original chisel edge, along the plane counterclockwise at 25 degrees and Grind a V-shaped groove vertically in the axial direction. The two groove sides of the V-shaped groove form two inner cutting edges, and a chisel edge is ground to form a four-pointed and eight-edged chisel-free drill.
[0013] Such as figure 1 The four sharp corners shown in the front view are sharp corner one (a), sharp corner two (b), sharp corner three (c), sharp corner four (d), the outer edge (L1) on the left side of the drill, the arc edge (L2), the inner edge (L3), the four edges of the inner cutting edge (L4), and the four edges on the right side of the drill that are symmetrical to the left side, thus forming eight edges.
[0014] The angle between the two inner cutti...
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The invention discloses a four-tip and eight-edge drill bit without a chisel edge. A drill bit body adopts a three-tip and seven-edge basic gang drill bit; a V-shaped groove is ground between two arc edges of the basic gang drill bit, namely the position of the original chisel edge along a plane in the counterclockwise direction at 25 to 28 degrees and in the axial direction perpendicular to the edges; two inner cutting edges are formed on two sides of the V-shaped groove; and one chisel edge is ground away, so that the four-tip and eight-edge drill bit without the chisel edge is formed. With the adoption of the four-tip and eight-edge gang drill edge type, when fragile metal material is drilled, the operation difficulty is reduced and the drilling technologic scope is expanded, and therefore, the working efficiency can be improved.
Description
technical field [0001] The invention relates to a drill bit, in particular to a four-pointed and eight-edged drill bit without chisel edges, which can be used on ordinary drilling machines, numerical control drilling machines and boring machines for drilling brittle metal materials. Background technique [0002] The existing high-speed steel twist drill bit, its main body includes a cutter body and a cutter head, the cutter body is provided with a spiral groove as a chip removal groove, and the cutting part on the cutter head includes two symmetrical cutting edges, between the symmetrical cutting edges is Chisel edge, the main resistance in drilling comes from the chisel edge, so it is inefficient when drilling brittle metal materials. [0003] The existing basic group drill has three points and seven edges, and its cutting speed of brittle metal materials is 2 to 3 times higher than that of the above-mentioned ordinary twist drill, but its chisel edge is shorter than that o...
Claims
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Login to View More IPC IPC(8): B23B51/00
Inventor 蔡晓双於星孙重阳
Owner SUZHOU INDAL PARK INSTITUE OF VOCATIONAL TECH