SU1646711A1 - Double-edge drill bit - Google Patents

Abstract

The invention relates to the processing of metals by cutting and the molecules to be used for machining holes with internal-feed drills & The aim of the invention is to increase the productivity of the drill and increase its service life by improving the coolant supply to the cutting zone. The two-prong drill bit consists of the cutting part with carbide inserts 1, 2 and the body 3. Both feathers are connected by a bridge, which is a part of the body of the drill. In the case of the drill, a hole 5 is offset relative to the axis of the drill in such a way that at the exit the forming hole 5 coincides with the axial plane of the drill parallel to the transverse edge 2 ”

Description

1

The invention relates to metal cutting and can be used for machining holes with internal drills.

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The aim of the invention is to increase the productivity of the drill and increase its service life due to the improvement of coolant supply to the cutting zone.

FIG. 1 shows the proposed drill, side view; in fig. 2 - the same plan view.

A two-prong drill with a hole for internal coolant consists of a cutting part with carbide inserts 1 and 2 and a housing 3. Both feathers of the drill are connected to each other 4, which is a part of the drill body. In the case of the drill, along the whole working area with chip grooves, the hole 5 is displaced relative to the soybean so that, at the exit after each regrinding, the forming hole 5 coincides with the axial plane of the drill parallel to the transverse edge 6. The hole 5 communicates with the hole the tail end of the drill. The width of the cutting plate 1 is 1 / 2D, where D is the diameter of the drill, and the corresponding length of the main cutting edge is 1. The side surface of the plate 1 facing the coolant hole is aligned with the axial plane, mormal to the main cutting edges. The width of the direction plate 2 is selected on the basis of design considerations but not more than 1/2 (B - dc), where dc is the diameter of the core of the drill, and the length of the cutting edge corresponding to the cutting plate 2 is 1 .. The front surfaces of the cutting plate are sharpened at the rear angle - on two planes at the corners (Y ,,,, and Ck Ma On the feather, which contains a hole in the core area for internal coolant supply, in the area adjacent to the transverse edge, an additional sharpening was performed with the formation of an angle of transverse blade X in front of it, and performed so that edge 7 crossing the front surface

8 of the surface 9 of the reinforcing chamfer with a width of 1 is located in the axial plane parallel to the edge 6. This section is located. he is at an angle D (p with respect to the main cutting edge of the plate 2. In this case, the transverse edge is displaced from the drill axis 1.1 located at an angle of the CR with respect to the main cutting edges, allowed within ln 0.01-0.25 mm „

The drill works as follows.

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50

During the rotation and axial movement of the drill, the section of the transverse cutting edge 6, which is made on the relaying part 1, comes into operation at the beginning. At the same time, the pod is transported freely to the chip core. Then successively spurs - from the work of the sections of the edges of both Tastins. The SOL, which is released under pressure from the hole, provides cooling and lubrication to the surface of the vessel, and also facilitates the efficient transportation of chips from the cutting zone.

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An earwig with an ero contains a body with chip grooves and a cutting part, the back surfaces of which are referred to as flat sharpening and additional for the back surface point of one feather, and the offset is offset from the drill face, while a hole is made in the cutting part of the body designed for internal coolant supply, shifted relative to the OGI drill towards the pen with additional sharpening, characterized in that, with the aim of improving the performance of rolling and increasing its service life by improving supplying coolant to the cutting zone ogtsrrs- Gia, designed for internal supply of the coolant, formed by voey length of the drill body, wherein at vy-- uode forming said apertures coincides with isergn plogkh 1yu drill ,, parallel to the transverse edge

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2

Claims (1)

A two-feather drill containing a body with chip grooves and a cutting part, the rear surfaces of which have planar sharpening and additional sharpening of the rear surface of one pen, and the transverse edge is offset relative to the axis of the drill, while a hole is made in the cutting part of the body for the day of the internal coolant supply, offset relative to the axis of the drill towards the pen with additional sharpening, characterized in that, in order to increase the productivity of the drill and increase the resource of its work by improving ode to the cutting zone, the hole intended for the internal coolant supply is made along the entire length of the drill body, while at the output the generatrix of the said hole coincides with the axial plane of the drill = parallel to the transverse edge <