Handle brazing twist drill and manufacturing method thereof

Abstract

The invention belongs to a metal cutting tool and manufacturing technology, and relates to a handle brazing twist drill and a manufacturing method thereof. The handle braze twist drill comprises a handle portion and a cutting portion, a blind hole is drilled in the center of the handle portion, the rear end of the cutting portion is coaxially inserted into the blind hole and is in clearance fit with the blind hole, and brazing materials fill the fit clearance and the bottom clearance between the rear end of the cutting portion and the blind hole. According to the metal cutting tool, a brazingmode is adopted, so that the handle portion and the cutting portion of the split type twist drill are connected, the connecting strength is high, and the appearance quality is good; and a workpiece ina clamp is heated and brazed through an induction heating mode, so that the manufacturing process is simple, the coaxiality is easy to guarantee, and the manufacturing cost is low.

Description

technical field [0001] The invention belongs to metal cutting tools and manufacturing technology, and relates to a shank brazing twist drill and a manufacturing method thereof. Background technique [0002] Existing twist drills mainly have two structural forms: [0003] One is an integral structure, that is, the shank and cutting part of the twist drill are processed from the whole tool steel material. The cutting part and the shank of this structure are made of the same expensive tool steel. On the one hand, the consumption of precious materials is relatively low. Large, on the other hand, the manufacturing process is complex and labor-intensive, so the product cost is high; [0004] The other is a split connection structure, that is, the cutting part and the shank part of the twist drill are processed with different materials and then connected. This structure can reduce the use of expensive tool steel materials and reduce material costs. However, in the existing techno...

AI Technical Summary

Problems solved by technology

However, in the existing technology, the connection between the shank and the rear end of the cutting part of the drill bit is usually realized by means of riveting, conical self-locking, holding glue, radial piercing pins, etc., which not only require high machining accuracy of the process parts, but also require high torsional strength after connection. Not high, the radial runout of the drill point relative to the shank is large, and the production process is complicated and the productivity is low

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