Drill
A drill bit and screw technology, applied in the drill bit field, can solve the problems of reducing the machining accuracy, the drill bit does not have centering, and consumes a lot of time, and achieves the effect of improving the machining accuracy and efficiency.
Inactive Publication Date: 2014-12-10
CHANGZHOU XILI ALLOY TOOLS
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Problems solved by technology
[0002] Existing drill bits are often entangled by drill cuttings during drilling, which not only seriously affects the surface quality of the drilled hole, reduces the machining accuracy, but also brings serious safety hazards to the personnel who operate the machine tool, and the existing drill bits are not With the function of centering, it is necessary to punch a concave hole on the surface of the workpiece with a punch before drilling, and then drill the hole at the center to facilitate centering during drilling. The process is complicated and the drill needs to be replaced, which takes a lot of time
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[0015] Such as Figure 1 to Figure 3 The drill bit shown includes a handle 2 and a cutting part 1 at the front end of the handle 2. The cutting part 1 is provided with two helical cutting edges 1.1, and between the helical cutting edges 1.1 is a helical chip relief groove 1.2. The main cutting edge 1.11 where the front end of the cutting part 1 meets, and the spiral side edge 1.12 spirals along the cutting part 1. The main cutting edge 1.11 meets smoothly at the front end of the cutting part 1 to form a cylindrical protrusion 1.13, and the main cutting edge 1.11 is on the protrusion 1.13 continues to extend spirally and stops at the front axis of 1.13 to form a convex point 1.14, and the helical side edge 1.12 is uniformly provided with multiple notches 1.121 along the helical direction, and the helical side edge 1.12 corresponding to the front of the notch 1.121 gradually moves to the bottom of the notch 1.121 Shrinks and smoothly connects with the bottom of the notch 1.121, ...
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The invention relates to the technical field of metal cutting, in particular to a drill. The drill comprises a tool handle and a cutting part at the front end of the tool handle. The cutting part is provided with two spiral cutting edges. A spiral chip receding groove is formed between the spiral cutting edges. The spiral cutting edges comprise the main cutting edges and the spiral side edges, wherein the main cutting edges and the spiral side edges are arranged at the front end of the cutting part. The main cutting edges intersect at the front end of the cutting part and form protrusions, and the main cutting edges continue extending spirally on the protrusions and stop at the front end axes before the protrusions to form convex tips. The spiral side edges are evenly provided with a plurality of notches. The positions, corresponding to the fronts of the notches, of the spiral side edges gradually contract to the bottoms of the notches and are in smooth connection with the bottoms of the notches. The positions, corresponding to the rears of the notches, of the spiral side edges are connected with the rear ends of the notches through bevels. The spiral chip receding groove is provided with an arc-shaped groove. The front end of the groove is in smooth transition with the surface of the spiral chip receding groove through an arc surface, and the rear end of the grove is connected with the surface of the spiral chip receding groove at a right angle. The drill has the functions of centering and positioning, the chip breaking effect of drilling is good, and metal chips will not be wound around the drill.
Description
technical field [0001] The invention relates to the technical field of metal cutting, in particular to a drill bit. Background technique [0002] Existing drill bits are often entangled by drill cuttings during drilling, which not only seriously affects the surface quality of the drilled hole, reduces the machining accuracy, but also brings serious safety hazards to the personnel who operate the machine tool, and the existing drill bits are not With the function of centering, it is necessary to punch a concave hole on the surface of the workpiece with a punch before drilling, and then drill the hole at the center to facilitate centering during drilling. The process is complicated and the drill needs to be replaced, which takes a lot of time. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a drill bit for the above-mentioned defects. The drill bit has the function of centering and positioning, and the chip breakin...
Claims
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IPC IPC(8): B23B51/02
CPCB23B51/02B23B2251/085B23B2251/40B23B2251/48
Inventor 胡金斌
Owner CHANGZHOU XILI ALLOY TOOLS