SU1572793A1 - Method and apparatus for continuous superfinishing of balls - Google Patents

Abstract

The invention relates to abrasive machining and can be used for continuous superfinishing of balls. The purpose of the invention is to improve the accuracy of the geometric shape of the balls by continuously changing the distance between the rolls during processing. The distance between the rolls varies from minimum to maximum and back over a period equal to the time it takes for the ball to pass under all bars. A device for implementing the method of treating balls contains a mechanism for continuously changing the distance between the rollers. 2 sec. f-ly, 1 ill.

Description

The invention relates to abrasive machining and can be used for continuous superfinishing of balls.

The purpose of the invention is to improve the accuracy of the geometric shape of the balls.

The drawing shows a scheme of continuous superfinishing of balls "

A device for implementing the method comprises a smooth conveying roller 1, a profiled roller 2 with a helical groove of an angular profile, abrasive bars 3 of different grain sizes and hardness. The outer radius of the smooth roll is RJ. where R is the outer radius of the smooth roll; R is the radius of the profiled roll at the point of contact of the ball with one of the sides of the profi helical groove. The device also contains two shoulders D and 5 levers, one of the arms of which is fixed to the axles of the smooth and profiled rolls, while the others are connected to nuts 6 and 7, the bar, which are read on the driving screw 8. The foam plate consists of two parts directional threads interconnected by a smooth section at the point of passage of the major axis on, Coupling 9 and a gearbox 10 connected to an electric motor 11 electrically connected to limit switches 12 and 13 are installed on the axis of the spindle screw. Arm 4 has a segment 14 with contact 15 installed m to cooperate with limit switches 12 and 13.

The method is implemented as follows.

Before the start of work, the rolls 1 and 2 are set so that their axes of rotation are parallel, and the distance between them has a minimum value A defined by the formula

Amine Rr f Rn + hell, Itz,

WITH

SP

h

You j

WITH

oz

MIN S

where R is the outer radius of the smooth

roll;

R is the outer radius of the profiled roll;

  minimum clearance between rolls „

The value of Amia is established experimentally and is 0.5-1 mm. The distance ammn corresponds to the reference angle oi,

The smooth roller 1 and the profiled roller 2 rotate in the same direction with the same angular velocity C0 &. The balls to be processed are fed one by one from the feeding tray of the loading device (not shown) and are placed in the hollows of the helical groove of the profiled roll 2.

The balls 16 receive rotation around the instantaneous axis with an angular speed (the direction opposite to the direction of rotation of the rolls 1 and 2, and moving in the turns of the helical groove along the axes of rotation of the roll) The abrasive bars 3 with a certain force P put pressure on the balls 16 and simultaneously return -accessible motion with a high frequency and a small amplitude of oscillation along the axes of the rolls (oscillating motion).

The removal of metal from the surfaces of the balls 16 occurs during their passage through rolls 1 and 2 under the abrasive bars 3 The first bars provide the main metal removal and correction of out-of-roundness and waviness, and the subsequent ones provide a high class of surface cleanliness, I

Change in distance between axes

rolls 1 and 2 occurs due to the movement of nuts 6 and 7 along the threaded screw 8, which receives rotation from the electric motor 11 through the gearbox 10 and the coupling 9. This occurs as follows: „Nuts 6 and 7, moving along the running screw 8 in the direction of the major axis rolls, turn two shoulders levers 4 and 5 around the supports, pushing the rolls 1 and 2 "When the lever 4 turns at a certain angle, contact 15, interacting with the contact of the limit switch 13, it commands the motor to change the direction of rotation. The finite switch 13 is set so that the reverse of the engine 11 begins at this shaft-jKOB position when the distance between their axes

g

Q 5

0

5 0 5

0

has a maximum value, which is determined by the formula

AMCIKC Rr + Rn + amo | ks where amake is the maximum gap between

rolls.

This value is established experimentally and is (0.75-0.9) dw, where the diameter of the ball to be processed. The distance A d, d cc corresponds to the reference angle a ,.

Claims (2)

1. A method of continuous superfinishing of balls, in which the balls are placed on two parallel-mounted and rotating rollers and moved along the axis of rotation of the latter by means of a helical groove on the working surface of one of the rolls, and the treatment is carried out using oscillating abrasives installed in a row along the large axis of the rolls bars of different granularity and hardness, characterized in that, in order to increase the accuracy of the geometric shape of the balls, the distance between from the rolls from the minimum A ddIN to the maximum AMC1X values and back over a period equal to the ball passing time under all the bars, with the values of Amia Amax being determined by dependencies  milli ouc  Rr + Rn (0.5-1.0) mm; Rr + Kn (0.75-0.9) -d TO w - the radius of the outer surface of the smooth roll; R n is the radius of the outer surface of the profiled roll; -1.0) mm - the minimum gap between the rollers; 5-0.9) s1sh - the maximum gap between the rolls; 15727936. moving the balls, as well as abrasive bars installed along the large axis of the rolls, characterized in that it is equipped with a mechanism for changing the distance between the axes of the rolls, made in the form of two shoulders, one of the arms of which is fixed on the axes of the smooth and the prof- rolls, and the other shoulders are connected to the nuts mounted on the drive screw, which consists of two parts with opposing threads, connected by a smooth section 1sh - diameter of the machined in place of the passage of the major axis of the ball. rolls mounted on the running axle clutch screw, and motorized gearbox, electrically connected 2. A device for continuous sweeping of 4 balls, containing two rolls installed in parallel with the possibility of rotation — a smooth cylindrical and shaped with a helical groove for rotation and a dog with limit switches; the 20 arms of one of the double-arm levers are provided with a contact installed with alternating interaction with limit switches. gt.- "-os and with limit switches, with the shoulder of one of the two shoulders levers provided with a contact installed with the possibility of alternate interaction with the limit switches.