half round drill bit

Abstract

The invention provides a semicircular drill head, and can simultaneously generate a concealed top core and a guide column function to optimize the accuracy of machined holes during cutting. To-be-formed holes are firstly cut by an eccentric drill tip and a cutting edge with chip breaking step, then continues to increase aperture by a drill body and a drill edge. According to the semicircular drillhead, the drill tip and a stepped edge is of an eccentric structure, so that the central static point is minimized, the chips generated during cutting are refined, thereby achieving drilling resistance minimization advantages, cutting aperture accuracy and stability are improved, the rigidity of the drill point, the drill edge and the drill body are strengthened.

Description

technical field [0001] The invention relates to a cutting tool, in particular to a drill bit with a semicircular single-edged structure, which can produce a hidden center at the same time during cutting. The hole diameter is continuously increased by the drill body. According to this, the drill tip is an eccentric structure, which minimizes the center static point, and refines the chips generated during cutting to achieve the advantage of minimizing the drilling resistance and improving the accuracy of the cutting hole diameter. A half-round drill with enhanced drill tip and drill body rigidity. Background technique [0002] Existing twist drills mainly rely on two drill edges to remove material to create a hole diameter. When the drill cuts material, the chips generated by the two drill edges are discharged out of the hole along the chip flute. The chip width is large, and the limited chip removal The inside of the groove (groove width is about 1 / 4 drill diameter, chip wid...

AI Technical Summary

Problems solved by technology

But this case still has the following disadvantages: (1) the drill point 103 is set at the center, which is the static point, and the drill point 103 has no cutting function but increases the cutting resistance during cutting; (2) as shown in the accompanying drawings of the case, In order to reduce the cutting resistance, a plurality of grooves 105 are provided on the drill edge 104. The design of the discontinuous straight cutting line of the cutting edge can increase the chip cutting ability of the drill bit 101, and reduce the risk of chips rolling on the drill edge 104 in a lump. the end

Through this type of structure, on the one hand, the drill tip 103 is reduced, and on the other hand, the chips are miniaturized through multiple cutting edges, reducing chip removal resistance; however, grinding the groove 105 on the drill edge 104 can reduce the cutting resistance and at the same time The drill bit 101 is rigid, so the processing must reduce the feed rate to avoid the wear of the drill bit 101. This method not only prolongs the processing time, but also causes the power loss of the machine tool, increases the cost and loses competitiveness

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