SU1247175A1 - Boring mandrel - Google Patents

Description

This invention relates to metalworking and can be used in boring holes.

The purpose of the invention is to improve the quality of processing by increasing the rigidity of the structure.

FIG. 1 shows a boring mandrel with a general view (at the working position of a Lolu-finishing cutter); in fig. 2 the same, when the working position of the finishing tool; in fig. 3 is a view A of FIG. 2; in fig. 4 is a section BB in FIG. 3

The boring mandrel contains a composite body 1, in the rectangular transverse groove of which the tool holder 2 is arranged with the possibility of radial movement, carrying diametrically located radial 3 and clean 4 cutters. A groove 5 is made in the tool holder 2. In the case I, a pusher b is installed with the possibility of axial movement and interaction with the groove 5 of the tool holder 2 by means of a mating surface. The groove 5 of the toolholder 2 and the plunger 6 are made with two eccentric conical surfaces 7, 8 and 9, 10, respectively, facing

one to the other by their guides. Fixing the pusher b against rotation relative to the housing 1 can be carried out by means of a pin 11.

The mandrel works as follows.

In the case of a semi-finish bore, the pusher b is moved by a power cylinder (not shown) to the extreme right position and its support surface 9 centers the tool holder 2 along the conical surface 7 of the groove 5. At the same time, the semi-finished cutter 3 is in the working position, and the finishing cutter 4 is retracted from the work surface. When moving the boring bar (from right to left in the drawing),

semi-final processing.

When finishing the bore, the pusher b moves to the extreme left position and its support surface 10 centers the tool holder 2 along the conical surface 8 of the groove 5. The tool holder 2 moves

in the radial direction, removal of the semi-finishing cutter 3 from the machined surface and bringing the finishing cutter 4 to the working position. Thereafter, the boring bar is moved (from left to right in the drawing), producing a fine boring hole.

Type A

FIG. g

FIG. 3

Compiled by Klimov

Editor A. OgarTehred I. VeresKorrektor V. But ha

Zakap4056 / 14 Circulation 1001 Subscription

VNIIPI USSR State Committee

for inventions and discoveries

113035, Moscow, Zh-35, Raushsk nab. 4/5

Branch PPP "Patent, Uzhgorod, st. Project, 4

FIG. tf

Claims (1)

BORING CORRECTION, comprising a housing in which the tool holder is located, with the possibility of radial movement, bearing two diametrically located cutters, while a groove is made in the tool holder, and a pusher is installed in the housing with the possibility of axial movement and interaction with the surface of the specified groove by means of the counter surface, characterized in that, in order to improve the quality of processing, the groove of the tool holder and the pusher are made with two eccentric conical surfaces facing one another moieties. SU ,, 1247175 FIG. 1