SU1743718A2 - Method of hole machining - Google Patents

Abstract

Use: metal cutting, namely the processing of oval ridges or straight linear grooves. SUMMARY OF THE INVENTION: Providing machining of oval-shaped holes, which is carried out by tool 1, which is a gun drill having a blade 2 with a smaller radius of a point and a blade 3 with a large radius of a point, which is installed in a rotating spindle 4, having an axial feed. The tool vibrates when the flange 6 interacts with the vibrator 5. Before machining, the tool 1 is placed on the larger axis of symmetry of the oval hole at a distance from the axis of intersection of the planes of the latter, equal to the half-difference of the largest size of the oval and the diameter of the tool intersections of the mentioned symmetry planes. At the same time, the tool 1 is given the axial feed with the greatest value, and the parts mounted on the floating table 8 are informed by plane-parallel movement in the direction perpendicular to the axis of the tool 1, after which its oscillation phase is changed by 180 °; by turning the vibrator 5. 6 Il.

Description

The invention relates to the field of metal cutting, namely, the processing of oval holes or straight deep grooves and is an improvement of the known technical solution according to the author. No. 1180172.

The purpose of the invention is the expansion of technological capabilities by obtaining oval-shaped holes.

Figure 1 shows the initial position of the tool when implementing the method at the time of the smallest supply; in figure 2 - the same, at the time of the largest supply; in FIG. 3, the extreme position of the tool when machining a hole with a length L; figure 4 - the same, with

changing the phase of oscillation; FIG. 5 is a view A of FIG. 3; Fig. 6 shows the tool movement trajectory during cyclic phase change of oscillations.

It is necessary to obtain an oval hole of length L, depth I, width D. Tool 1 is sharpened so that the blade 2 with a smaller radius cuts the material, and the blade 3 with a larger radius of the pointed rests on the cutting surface (a drill tool has this design). During processing, the tool 1 installed in the spindle 4 rotates with it, the feed movement is communicated to the spindle and a non-rotating vibrator 5 interacting with the VJ N

GJ 4

WITH

Yu

spindle flange 6 b. When the spindle rotates, its bevelled flange b slides on the vibrator and the spindle receives axial oscillations with the frequency of rotation and amplitude AS. Before starting the treatment, the part 7 fixed on the floating table 8 is set relative to the drill so that the axis of the latter is located at a distance (L-D) / 2 from the center of intersection of the symmetry planes of the oval hole. In this case, the tool direction at the beginning of machining Can be carried out along the conical inlet 9. To machine an oval hole in a given direction, tool 1 is installed in spindle 4 so that the main plane of the drill coincides with the plane in which flange b has the greatest slope , and the cutting blade 2 should be located on the side where this flange is thinner. The vibrator 5 is set in such a way that the plane in which the axial feed will have the smallest and largest values coincide with the direction of the larger axis of the oval, and fixes it in this position. After the start of machining, the tool will have the smallest axial flow, and after half a turn - the largest. When basing the blade 3 on the cutting surface and axial oscillations of the tool during each revolution, the tool will shift in the radial direction by a certain amount A AI - Yes, where AI is the radial displacement of the drill at the highest axial feed rate S + AS, and Az - at the smallest axial feed. In this case, tool 1 will move in the axial direction, and the part in the direction Sp, i.e. the relative plane-parallel movement of the part will be performed, as a result of which the additional cutting blade of the tool 1 will cut the side walls of the hole. The tool moves in a given direction to the distance L-D and depth

N. Then the oscillation phase is changed by rotating the vibrator 5 by 180 and the processing cycle is repeated, as a result of which the part will be shunted in the opposite direction to the distance L.-D and depth (2. Then the oscillation phase is again changed by rotating the vibrator 5 by 180 °, and the cycle is repeated until the required hole depth I is reached; the tool path will be zigzag (Fig. 6).

An example of a specific implementation method.

The treatment was carried out with a gun drill. Axial oscillations created by a special vibrator on the machine mod. 2H135 (vertical-drilling). Rotation speed 36 rpm; axial feed, 14 mm / min; oscillation amplitude, 2 mm. The frequency of oscillation is equal to the frequency of rotation. The oscillation phase was changed every 5 mm depth of the hole. Preparation material - plexiglas. The diameter of the tool is 11 mm. An oval hole with MM dimensions was obtained; I-20 mm; 11 mm wide.

Claims (1)

Invention Formula The method of processing holes cho aut.St. Ms 1180172, characterized in that, in order to expand the technological capabilities by obtaining oval-shaped holes, before starting the processing, the tool is placed on the larger axis of symmetry of the oval hole at a distance from the axis of intersection of the symmetry L-D planes ri last where L is the largest size of the oval, D is the diameter of the tool, the blade with a smaller radius of the spike is directed to the intersection axis of the mentioned symmetry planes, while simultaneously the tool is informed of the axial flow with the greatest value, and the parts are reported plane-parallel movement in the direction perpendicular to the tool axis then change the phase of oscillations of the latter by 180 °, L 812.SSH shigd P Figm 5 No. 6