SU1488181A1 - Tool for working small-diameter deep bores - Google Patents

Abstract

A tool for processing deep holes of small diameter, containing an expanding element in the form of rectangular corrugations, in the hollows of which cutting elements are fixed, while the expanding element is installed with the possibility of longitudinal stretching, characterized in that, in order to improve the machining accuracy, the expandable element is provided with at least one more rectangular corrugation, wherein the corrugations are located along a circle in a plane normal to the tool axis and facing each other by depressions.

Description

The invention relates to a machine tool industry and can be used to finish machining deep holes in parts of machines and devices.

The aim of the invention is to increase the processing accuracy.

Figure 1 shows the proposed tool; figure 2 - the same, in the working position; on fig.Z - section aa on fig, 2, with two cutting elements; 4 - the same, with three cutting elements.

The tool consists of an expanding element stretched by wire 1. The expanding element is formed with the help of rectangular brackets 2 carrying the cutting elements 3. The brackets 2 are located circumferentially in a plane normal to the axis of the tool and are hollowed inwards. The ends of the staples 2 are fastened to the connecting sleeves 4, the stretching wire 1 is passed through the opening of the connecting sleeve A and fixed by the collar 5, the ends of the wire are fixed in the machine chucks (not shown) for machining the part 6 (Fig. 2). The cutting elements may be two (fig.Z) or more (figure 4).

The holes are machined as follows.

The tool is inserted into the machined hole of the part 6, and its ends are rigidly attached to the supports of the machine. After installation of the tool by axial movement of one support, the tool is stretched by force F, and parts 6 impart rotational and reciprocating motion. Coolant is supplied to the treatment area. Tension of wire 1 causes straightening of staples 2 and pressing of cutting elements 3 against the surface to be treated. The lateral expansion of the tool is controlled by a corresponding change in the tensile force R. At the same time, the cutting elements, which are located opposite one another, uniformly overlap the entire surface of the hole being machined during processing, which prevents the formation of geometrical errors in the hole.

S

(L

four

00 00

oo

5 2

one

g g u

Fdg

g

Aa

Fig.Z

Editor V. Petrash Tehred M. Khodanych

Order 3499/18 Circulation 662 Subscription

VNIIGSH of the State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 4/5, Moscow, Zh-35, Raushsk nab. 113035

1

D-

Fy

Proofreader M. Pojo

Claims (1)

TOOL FOR PROCESSING DEEP HOURS OF A SMALL DIAMETER, containing an expandable element in the form of rectangular corrugations, in the hollows of which the cutting elements are fixed, while the expandable element is mounted with the possibility of longitudinal extension, characterized in that, in order to increase the accuracy of processing, the expandable element is provided with at least one more rectangular corrugation, while the corrugations are located around the circumference in the plane normal to the axis of the tool and face each other with troughs.