Device for spirally grinding back knife face of spiral drill based on electrospark wire cutting

Abstract

The invention provides a device for spirally grinding a back knife face of a spiral drill based on electrospark wire cutting, which comprises a spiral drill, a rotary shaft, a ball screw nut pair, a rolling guide pair and a rack; the spiral drill is mounted at one end of the rotary shaft by a spanner three-jaw drill chuck; the other end of the rotary shaft is connected with a first step motor through a shaft coupler; the rotary shaft is mounted in a bearing seat by a bearing; a connecting plate is fixed to the bottom of the bearing seat; the ball screw nut pair is composed of a screw rod and a nut sleeved to the screw rod; the screw rod is connected to a second step motor; the nut is fixedly connected with the connecting plate; the rolling guide pair is composed of a groove arranged on a rolling guide block and a guide embedded in the groove; the rolling guide block is fixed to the bottom of the connecting plate; and the guide is fixed to the rack. The device provided by the invention has the advantages that: the device may not cause grinding burn injury of the back knife face for no grinding force, is not influenced by knife materials and knife sizes and can grind spiral drills of various conductive knife materials and sizes.

Description

technical field [0001] The invention belongs to the technical field of metal cutting tool sharpening, and in particular relates to a helical surface sharpening device for twist drill flanks based on wire electric discharge cutting. Background technique [0002] For standard twist drills, according to the cutting requirements, two purposes must be achieved after sharpening. One is that the distribution of the relief angle on the main cutting edge should be smaller on the outer edge, and the closer to the drill core, the larger it should be, and there should be an appropriate chisel edge bevel angle. and the front and rear angles of the chisel edge; the second is to require good linearity of the main cutting edge. The existing twist drill flank sharpening technology widely adopts grinding wheel sharpening, specifically there are conical surface sharpening method, helical surface sharpening method, plane sharpening method, hyperboloid surface sharpening method and cylindrical s...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a kind of helicoid method sharpening device of twist drill flank based on wire electric discharge cutting, to overcome existing emery wheel sharpening method sharpening twist drill to easily produce flank grinding burn, and can not The problem of sharpening small size twist drills below Φ10

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