SU1006086A1 - Boring bar with guiding assembly - Google Patents

Description

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The invention relates to metalworking and is gnawed to be used for machining deep holes.

A boring bar with a guide assembly is known, comprising a tubular body with a groove under the guide members 1.

A disadvantage of the known borstangis design, the guide assembly should be considered that the supports do not allow passage through the sealing assemblies of the oil receivers or guide devices due to the protruding of the guide elements above the surface of the boring bar.

The aim of the invention is to increase the longitudinal stability of the boring bar and to reduce the auxiliary time during drilling, boring, countersinking, etc. deep holes.

This goal is achieved in that the boring bars are provided with male and female sleeves, spring-loaded with respect to the housing, the external surfaces of the male and internal surfaces of the female sleeves are filled with equal eccentricities, and the guides placed on the female sleeves are spaced apart along the horizontal shaft.

FIG. Figure 1 shows a boring bar with a guide assembly with a cut, general view; in fig. 2 is pa & A-A in FIG. one; in fig. 3 shows a section BB in FIG. 1J in FIG. 4 - REID B in FIG. 1, FIG. 5 is a section G-Y in FIG. one; in fig. 6 - the same, when the guide element is made on the elastic base of the sleeve; in fig. 7 is another embodiment of the boring bar.

The boring bar with the guide assembly shown in Fig. 1 is a separate tubular body 1, on which support sleeves 2 and 3 are installed with guide keys 4 arranged on them. The housing 1 is placed between two sections 5 and b of the boring bars and secured by centering necks and threads. The location of the boring bar guide assembly is determined depending on the dimensions of the boring bars and on the length of the hole being machined, on the ratio of cutting forces and the strength of the boring bars. In order to simplify the assembly, in the middle part of the housing, sleeves 7 and 8 are located on the outer surface. The outer surfaces of sleeves 7 and 8 are made with eccentricity 6 relative to the axis of the housing 1, and the sleeves 2 I13 with similar eccentricity 1 | 2 are placed on the inner surface relative to the outer concentric to these sleeves.

Sleeves 7 and 8 are fixed rigidly on the tubular housing 1 using

tapered pins 9 (Fig. 2 and 3. On one side of the sections at the ends of the support sleeve 10 and sleeve 8 (Fig. 1. and 4), lugs 11 and 12 are embedded, in which the ends of the twisted spring 13 are fixed. Support sleeves 3, 2 and 10 are interconnected by grooves and protrusions, providing simultaneous reversal of them (Fig. 5).

The guide elements 4 pok 10 in FIG. 1 in contact with the surface of the machined hole of the part 14 in three equal areas offset from each other. The eccentricity value is chosen

5 depending on the size of the annular gap required for the supply of coolant. The annular gap -fc is formed by the outer surface of the steb T), by the surface

0 of the machined hole d, .- blanks 13. The guiding elements 4 mounted on the outer surface of the support sleeve 3 (.4, 10) can be made elastic by performing the undercut of the sleeve (Fig. B).

Borshtanga works as follows ..

Before inserting the guide assembly into the sealing device of the oil. Receiver or as it passes through the roller steady, one of the thrust bushings 2 and 3 is rotated and thus a cylindrical surface can be obtained without the guide elements 4 protruding. After the passage

 through the oil receptacle bushings 2 and 3, which are rigidly connected by means of grooves and corresponding protrusions, are mounted under the action of the spring 13 in the initial position, ensuring the contacting of the guide elements 4 with the surface of the machined hole on the surface of the machined hole of the workpiece 14.

5 cops are determined by the spring characteristic. Upon completion of processing by turning the support sleeve 3 in the opposite direction, the guide pins 4 together with the support sleeve are aligned with the surface of the boring bar.

Boring bar structures can be used for machining deep holes, as shown in FIG. 7. Borshtanga is a two-layer pipe. The inner tube is 1 GV carrier and is mounted in the feed carriage. The outer pipe 2 is from the side of the support sleeves 3 and 3 3 .H3L by means of projections and grooves (Fig. 5), and the other end is free or has a rotation and fixation drive relative to the supporting pipe 1. On the outer surface of the support sleeves 3

5, guide elements 4 are installed,

made in the form of a carbide plate placed in the groove of the sleeve 3. Before the boring bar guide assembly passes through the sealing units of the oil receiver 5, the sleeve is rotated clockwise. The rotation of the outer pipe 2 in one direction or another can be carried out manually and mechanically driven. When the pipe 2 is rotated, the cylindrical surfaces of the support sleeve 3 are aligned with the surface of the boring bar, and thereby ensuring free passage of the boring bar along its entire length. At the opposite rotation of the pipe 2, the support sleeves 3 respectively unfold and are in contact with the treated

the surface of the part 6 (FIG. 6). The guide pins 4 protrude above the outer surface of the boring bar.

The above design solutions for the implementation of boring with direction-. with a knot, they allow to increase the rigidity of the boring bar –instrument system, to eliminate the bending of the boring bar used in the machining of deep holes, and

0 auxiliary time required for boring bar maintenance during operation. These circumstances ultimately also increase the productivity and accuracy of the operation of machining deep holes in parts.

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Claims (1)

BORING STAINS WITH GUIDE ASSEMBLY, comprising a tubular body with a groove under the guide elements, characterized in that, in order to increase productivity, the boring bar is provided with male and female bushings spring-loaded relative to the housing, the outer surfaces of male and female surfaces of female bushings being made with equal eccentricities, and guides placed on female sleeves are spaced along the axis of the boring bar. g * = “ ^A Figure 1 B