Double-end pilot drill

Abstract

The invention discloses a double-head centering drill, which comprises a first end edge, a chip removal groove, a first side edge, a first cutter head, a stopper, a spring washer, a handle, a fixed block, a second cutter head, a second cutter head, and a second cutter head. Two side cutting edges, a second flute, a second end cutting edge and a receiving groove. Both ends of the handle of the double-ended pilot drill of the present invention are threadedly connected to the first cutter head, so that the pilot drill can be disassembled and the handle can be reused, thereby reducing the waste of available parts of the pilot drill ; There is a second cutter head engaged inside the receiving groove, and the second cutter head is threadedly connected with the receiving groove, and both the first cutter head and the second cutter head are of the same size, so that the cutting head can be carried out without introducing new materials. The replacement between the center drills prolongs the service life of the pilot drill, further reduces the waste of materials, and greatly saves the manufacturing cost; at the same time, the end edge is set in an arc-shaped structure, which effectively reduces the resistance of the blade during drilling, thereby reducing occurrence of breakage.

Description

technical field [0001] The invention relates to a spot drill, in particular to a double-head spot drill, belonging to the field of mechanical processing. Background technique [0002] Spot drill is a commonly used drilling tool in machinery manufacturing, its main purpose is industrial drilling, widely used in processing, machinery, shipbuilding and other industries. The apex angle of the center drill should be equal to or greater than the micro-drill apex angle of the final drilled hole. If the apex angle of the center drill is small, then when the micro-drill cuts in, the two cutting edges will contact the workpiece before the tip, which may easily cause edge chipping . Before drilling, use a rigid center drill to drill an initial hole with a depth of 1 to 2 times the diameter to ensure the accuracy of drilling with ordinary drills, and reserve chamfers for tapping, which is convenient for tapping. silk processing. [0003] The cutter head of the current double-ended ce...

AI Technical Summary

Problems solved by technology

[0003] The cutter head of the current double-ended centering drill is generally welded to the handle so that it cannot be disassembled, and the blade is easily damaged during the drilling process. In the end, the damaged centering drill can only be discarded as a whole, resulting in waste of materials , thus increasing the cost of work

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