SU1712132A1 - Device for finish-machining of parts - Google Patents

Abstract

The invention relates to machine building, namely to the bilateral abrasive and non-abrasive finishing of flat surfaces. The aim of the invention is to improve the quality of processing and simplify the design. The device contains a base on which the main drive shaft is mounted with crankshaft 3, as well as two disk lap and separator 11 located in the Cylindrical hole 7 of the connecting rod housing 5 with a peripheral clearance, the connecting rod housing is connected to the base through a slider 6 allowing the connecting rod make angular and reciprocating movement in the horizontal plane of the base. The distance of the center of the cylindrical cavity from the slider is more than two times the distance from the crank. 2 Ill. • > & * ^^ XI N) K S > & phy ^

Description

The invention relates to mechanical engineering, namely to the bilateral abrasive and non-abrasive finishing of the flat surfaces of the parts.

The aim of the invention is to improve the quality of processing and simplify the design.

FIG. 1 shows a diagram of the machine section; in fig. 2 - the same, top view (upper lap is not shown).

The device comprises a base 1, on which the shaft 2 of the main drive is mounted with the crank 3. The shaft 2 is connected by a V-belt drive to the electric drive 4 and pivotally, through the crank 3, to the connecting rod 5 (FIG. 2). The connecting rod 5 is pivotally connected to the base 1 through a slider b (Fig. 2) with the ability to make angular and reciprocating movement in the horizontal plane of the base 1. In the case of the connecting rod 5, there is a cylindrical through / 7 gauge (Fig. 2) placed between crank 3 ( Fig. 1) and a slider (Fig. 2). The slider 6 is removed from the center of the cylindrical cavity of the connecting rod 5 by a distance exceeding the distance between the center of the cylindrical cavity 7 and the crank 3 more than twice. On the horizontal plane of the base 1 (Fig. 1), the rod 8 is fixed, the axis of which with zero radius of the crank 3 (Fig. 2) coincides with the center of the cylindrical cavity 7 of the connecting rod 5 (Fig. 2). On the rod 8 are alternately strung upper 9 (Fig. 1) and lower 10 lap. The separator 11 is located between the lap and placed inside the cylindrical cavity 7 with a gap. The size of the gap does not exceed 2/3 of the radius of the crank 3 (Fig. 2). The gap between the cylindrical cavity 7 and the outer diameter of the lap 9 and 10 is always greater than the radius of the crank 3. The upper lap 9 (Fig. 1) is pivotally connected to the loading device 12. The pivot joint and the free fit on the rod 8 of the upper section 9 of the article 9 allows it self-aligning on machined surfaces of parts 13.

Device Whirl works as follows.

During operation, the main drive shaft 2 rotates and, via crank 3, communicates to the crank 5 a complex oscillatory motion consisting of an angular movement relative to the hinge of the slider 6 and a reciprocating mirror along the slide rail 6. The connecting rod points 5. located in the cylindrical area cavities 7, move along an elliptical trajectory close to the circle. Large axis

an ellipse corresponds to a double value of the radius of the crank 3. and the smaller one corresponds to 2/3 of the radius. Separator 11 being in contact with the inner surface

the cylindrical cavity 7 of the rod, repeats the movement of the rod 5 and additionally makes rotation around its own axis of symmetry by rolling on the inner surface of the cylindrical cavity 7, i.e.

0 makes a planetary movement. Thus, the parts 13, placed with a gap in the slots of the separator 11, copy its movement, i.e. they oscillate along an elliptical path, move along the working surface of disk lap 9 and 10, and additionally rotate about their own axis of symmetry. The complex movement of the part 13 with a continuous change in the direction of the two;

During one revolution of the main drive shaft 2, the processors intensify the processing, since the cartoon grains of the lap-ups 9 and 10 work with all protruding edges, self-clean from cuttings and retain their cutting properties.

The microrelief-machined surface of the part 13 in appearance represents the superposition of an infinite number of strokes (vortices) of an elliptical profile. The uniqueness of the trajectory and the repeated intersection of the strokes form the surface roughness, the magnitude of which depends on the size of the grain, the material of groundings 9 and 10, and the processing modes.

5 The kinematics of the movement of parts 13 relative to stationary lapings 9 and 10 ensures the constancy of the velocities of relative displacements, the constancy of the working movement, the constancy of accelerations of inertial forces.

This independence of processing mode parameters ensures the stability of the machining process and allows us to solve the problem of uniform wear of the working

5 surface lapping 9 and 10, and hence the problem of increasing the geometric accuracy and uniformity of the cleanliness of the surfaces to be processed in combination with the simplicity and reliability of the design.

Claims (1)

0 claims A device for finishing the parts, the separator of which is installed with the possibility of plane-parallel movement in the horizontal plane between two parts 5 located on the base of fixed hooks and placed in a cylindrical bore of the connecting rod body with a gap around the periphery, which is connected to the drive shaft through the crank, and with the base through an intermediate element, so as to improve the quality of processing and simplify the design, the intermediate element is designed as a slider, and the connecting rod is installed with the possibility of additional angular displacements in the horizontal plane, the magnitude of the distance of the center of the cylindrical cavity from the slide being greater than its distance from the crank at least one time. Srig. 2