SU1237321A1 - Attachment for drilling machine - Google Patents

Description

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The invention relates to a handheld mechanized tool and can be used, for example, in drilling and riveting works for machining holes in hard-to-reach places of products made from difficult-to-work materials.

 The aim of the invention is to expand the technological capabilities of machining in hard-to-reach places of the product by approaching the axis of the hole being machined to the walls of the product by reducing the size of the back drill bit.

This goal is achieved by unloading the rear support of the drill from the axial cutting force by balancing it with the oppositely directed axial force of the helical drive wheel.

The drawing shows the nozzle, a longitudinal section.

The nozzle includes a split housing consisting of parts 1 and 2, bolted together. Gear-spindle 3, parasitic gear 4 and gear-chuck 5 are installed in the housing. Gear-collet 5 carries a drill 6 clamped by a nut 7. All gears are helical, and the direction of inclination of the teeth on gear collet 5 is opposite to the cutting edge of the drill The front support of the drill 8 and the rear support of the drill 9 are made in the form of sliding bearings. Cover Yu has a hole for access to a through hole 11, used when knocking out a jammed drill.

The holes are machined in hard-to-reach places of the product 12, for example, in the corners.

The nozzle works as follows.

1237321 2

The housing with its clamp terminal is mounted on the housing of the drill. Drill 6 is inserted into gear-collet 5 and clamped by nut 7. Rotation through

5, the tapered connection from the drill is transmitted to the gear-spindle 3, then through the parasitic gear 4 to the gear-collet 5 and to the drill 6. Since the gear-collet tooth 5 is directed

10 opposite to the cutting edge of the drill bit, then when drilling a hole in the engagement, an axial force arises, which is directed against the axial cutting force. Thus, the rear support

15, the drill is unloaded from the axial cutting force, its dimensions can be chosen smaller, due to which it is possible to approach the hole axis to the product wall at a distance of -1 equal.

20 two drill diameters and less.

25

thirty

35

40

The quantitative value of the angle of inclination of the gear-collet 5 is determined by the value of the unloading, which is at least 50% of the axial force of the cut-. which is found from the ratio Р Р (, р. tgcc, where Rd.r is the circumferential force on the gear-collet 5, and tg on is the angle of inclination of the gear teeth of the collet 5. If it is accepted that the processing of difficult-to-work materials uses drill bits with the angle of inclination of the cutting edge WITH 20-45 °, the optimal ratio is 1-4.

Unloading the rear support reduces friction as the spindle rotates and increases the efficiency of the drive.

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The use of the nozzle is most effective when processing difficult-to-cut materials, since the axial cutting forces in this case are quite large.

Editor A.Gulko

Compiled by Yu.R Zanov

Tehred L.Oleynik Proofreader M.Sharoshi

3229/12

Circulation 1001 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35 Raushsk nab, „, d. 4/5

Production and printing company, Uzhgorod, Projecto st., 4

The quantitative value of the angle of inclination of the gear-collet 5 is determined by the value of the unloading, which is at least 50% of the axial force of the cut-. which is found from the ratio Р Р (, р. tgcc, where Rd.r is the circumferential force on the gear-collet 5, and tg on is the angle of inclination of the gear teeth of the collet 5. If it is accepted that the processing of difficult-to-work materials uses drill bits with the angle of inclination of the cutting edge WITH 20-45 °, the optimal ratio is 1-4.

Unloading the rear support reduces friction as the spindle rotates and increases the efficiency of the drive.

t

The use of the nozzle is most effective when processing difficult-to-cut materials, since the axial cutting forces in this case are quite large.

Claims (1)

BIT FOR DRILLING MACHINE for. drilling holes in hard-to-reach places, containing a drill with a drive of its rotation made in the form of helical gears, characterized in that, in order to expand the technological capabilities of machining in hard-to-reach places of the product by approximating the axis of the hole to be worked to the walls of the product, the teeth of the helical gear drive into rotation drill, made with opposite directions to the cutting edge of the drill, and the angle of inclination of the teeth of the helical gear is 1-4 of the angle of inclination of the cutting edge of the drill. SU .. „1237321 1 1237321