SU1690963A1 - Single side boring tool - Google Patents

Description

FIG. 2

The invention relates to the processing of metals by cutting and can be used for machining holes with drill bits with internal coolant supply.

The purpose of the invention is to increase drill resistance and machining accuracy by improving coolant supply.

1 shows a general view of the drill; figure 2 is a view of And figure 1; on fig.Z - section bb in figure 2; figure 4 - section bb In Fig, 2; Fig. 5 is a view of G in Fig.2.

The single-sided drill bit includes stem 1 and head 2. In stem 1, a chip discharge 3 and an internal channel 4 are provided for coolant supply. Cutting plates 5 and guide plates 6 and 7 are located on the head 2 connected to the stem 1. An internal channel 8 is provided for supplying coolant from which the transverse channels 9 and 10 are made towards the outer surface of the head 2. Cross channels 9 and 10 are located at an acute angle to the axis of the head and directed towards the front end face 11 of the head. The exit of the transverse channel 9 is located between the guide plates 6 and 7, and the exit of the channel 10 is between the guide 6 and the cutting 5 plates. The outlets of the transverse channels 9 and 10 are located at the ends of the guide plates 6 and 7, which are far from the cutting zone. The guide plates 6 and 7 are made on the head 2 with screw, with the left direction of the screw with the right direction of rotation of the drill. The angle o) of the inclination of the helix of the guides is determined by the interval

LU1

Pr + bn

arctg w arctg -r 1Rip

where (O - the angle of the helix, hail;

hp is the thickness of the cutting plate, mm;

1p is the length of the cutting plate, mm;

Bn is the width of the guide plate, mm.

The drill works as follows. In the process of drilling the coolant enters

from channel 4 to channel 8. Most of the coolant reaches the front end 11, washes it and removes the formed chips into the chute 3. A smaller part of the coolant through channels 9 and 10 enters the outer surface of the gum 2, forms a stream there towards the front end 11. which counteracts penetration from this end towards the guide plates 6, 7 of the used coolant contaminated with the products of tool wear and small chips of the product.

At the same time, the guide plates 6 and 7 are lubricated with a clean coolant over the entire width.

Claims (1)

Invention Formula A one-way cutter drill containing a stem with a chip outlet and an internal coolant channel. head with internal coolant channel, carbide cutting and guide plates and transverse channels extending from the inner channel to the outer surface of the head between the cutting and guide plates, characterized in that increases drill resistance and machining accuracy by improving coolant flow. the transverse channels are inclined to the axis of the head at acute angles and directed toward the front end of the head, while the guide plates are screwed, and the angle of inclination of the helix of the guides is chosen from the condition arctg) arctg. Ipip where ft) is the angle of inclination of the helix, degrees: hp is the thickness of the cutting insert, mm; Ip is the length of the cutting plate, mmHLH is the width of the guide plate, mm. eleven 1 7 WW AT FIG. H Bb Fig.Z view loernu / 0 until sharpened / collected B