SU1466917A1 - Arrangement for vibration generating process - Google Patents

Abstract

The invention relates to the cold treatment of metals and alloys by plastic deformation and can be used for finishing the surface of parts by vibro-rolling. The goal is to improve the quality of the regular microrelief. For this, the working part of the mandrel is made in the form of a bracket, in which two deforming elements (DE) with racks are installed. The radius of curvature of one DE is more than three times the radius of curvature of another DE. A rack with DE of a larger radius of curvature and brackets are installed with the possibility of mutually parallel movement relative to the shank of the mandrel and each other in a plane perpendicular to the direction of oscillation, and in a direction parallel to the feed of the workpiece. When the workpiece vibrates on the surface of the workpiece, the DE forms the profile and dimensions of the grooves of the regular microrelief, and DE with a large radius of curvature crushes, rolls out the sagging formed along the edges of the grooves to the height of the roughness of the original roughness. 3 il. i (L

Description

one

The invention relates to the cold processing of metals and alloys by the method of plastic deformation and can be used for finishing the surface of parts by vibrating.

The purpose of the invention is to improve the quality by smoothing the sagging to a height comparable to the height of asperities of the original roughness.

FIG. 1, the rationale for selecting the radii of the deforming elements is explained; in fig. 2 shows the proposed device, a general view; in fig. 3 is a section A-A in FIG. 2

The device consists of a mandrel 1 with a shank 2, which is inserted into the oscillation assembly (the assembly causing reciprocating movement of the deforming elements) of the vibration heads (not shown). In the body of the mandrel 1 there is a groove of the “dovetail” type in which the nut 3 is placed

The L-shaped bracket 4, to which the screw 5 is attached, is fixed in the mandrel 1, on which the flywheel 6 and the nonius 7 are located. In the horizontal shelf of the L-shaped bracket 4 there is also a “dovetail” groove parallel to the slot in the mandrel 1 in which it is installed vertical stand 8. A limiting stop 9 is installed on the end of the horizontal shelf of the L-shaped bracket to prevent the stand 8 from escaping from the groove. In the rack 8 there is a ball bearing 10, on which the deforming element 11 rests, housed in the separator 12, connected with screws (not shown) with the rack 8. The ball-support 10 is mounted on the axis 13, mounted in the rack 8 on the key 14 and secured by the nut 15. Inside the axis 13, a threaded hole is threaded, into which a screw 16 enters, mounted on a vertical shelf of an L-shaped bracket 4, on which the mouth

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An axis 17 with a ball bearing 18 and a separator 19 are installed, in which a deforming ball 20 is placed with a ball bearing support 18. On fly 16, a flywheel 21 and a nonius 22 are located.

The radius of curvature of the deforming elements, crumpling overflows, should be more than three times the radius of curvature of the deforming element profiling the groove. This condition is chosen by solving the inequality.

h, - h, -: hj., i.e. HA / GV 3, where Kd - the radius of the deforming (rolling out flows) element; fjj is the radius of the deforming (working, profiling) element; li is the depth of the groove from deforming with a ball with a large radius of curvature;

 the depth of the groove from deforming the ball with a smaller radius of curvature (the ball profiling the groove); 1ij - imaginary groove depth

(segment height).

The device works as follows.

Preliminary, based on the conditions for the formation of the necessary sinusoidal groove of the FFHR, sign Fsar and Pesi, f is determined. Then, set the stand 8 with the deforming element 11 on this value f., Turning the screw 16 with the flywheel 21 along the nonius 22 so that the distance between the centers of the deforming elements (balls) 11 and 20 is equal to f (this can be determined by contact points surface). Further, the screw 5 of the flywheel 6 is screwed along the nonius zero vernier 7 (not shown) to move the bracket 4 in the desired direction so that the axis of the shank 2 of the mandrel 1 passes through the middle distance between the centers of the deforming elements (balls) 11 and 20. After loading the device By the work force of deformation, turning on the workpiece feed and oscillation movement (oscillation direction perpendicular to the plane of Fig. 1), the surface of the workpiece vibrates. When this deforming the ball 20 squeezes out the grooves

FRMR, forming the profile and their dimensions, and the deforming ball 11 rolls out, crushes the nodules formed along the edges of the grooves to a height smaller than the depth of the grooves and comparable with the height of the irregularities of the original roughness.

For example, when applying the workpiece F, 2400. mm / min, oscillation frequency n 240 dv. x./min, wavelength of the IKR Р 10 mm groove, oscillation amplitude 8 mm, deformation effort per ball 400 N, workpiece material with hardness HB 200 kg / mm 2, deforming balls 3 and 12 mm respectively, width d of the groove d 0,424 mm, the depth of the groove microns,

L 8 μm, h 4 μm, the difference h, -h is 4 μm, i.e. -i within R 2.5-4 μm of the initial roughness, i.e. This inequality is feasible, moreover, 125r or 0.424 0.188, where r is the radius of the deforming core.

The application of the proposed device will provide for the creation of regular micro-reliefs with the exception of the negative effect of nodules on the performance of rubbing surfaces.

Claims (1)

Invention Formula five 0 A device for vibromachine, containing a mandrel mounted with the possibility of reciprocating movement and associated with a brace carrying a holder with deforming elements, characterized in that, in order to improve the quality by reducing the sag to the original roughness value, the mandrel is connected with the bracket is made in the form of a “dovetail” groove, and the bracket is made composite with a vertical stand and L-shaped, on a horizontal shelf of which a dovetail for mouth is made parallel to the groove of the mandrel Novki therein movable vertical Stoics, the radii of curvature of the deformation elements are in sootnoschenii Where 6rjr 3, radius of the work item. Nodules Nodules B 7 Phie.1 FIG. 2 U / U / 7 77 Fi.Z