SU1342698A1 - Method of bringing balls to the specified exact size - Google Patents

Abstract

The invention relates to the finishing treatment of parts and can be used in the bearing industry in fine-tuning balls. The aim of the invention is to improve the geometrical parameters and reduce the size of the balls while increasing productivity by leveling the processing conditions in the work areas. Balls 4 are processed by rolling between clamping disk 1 and driving disk 2, on the end of which annular grooves 3 are made, between which diamagnetic partitions 5 are installed. When processing in working areas, a magnetic field is created by an electromagnetic coil 6 sufficient to hold the ferromagnetic finishing paste between the partitions and the volume of the paste V. in each working zone is determined from the condition: V. 5H. + (0.2, ..., 0.6) (E „-Kb) YAN, where S is the cross-sectional area of the groove; R is the radius of the i-th groove; R - outer and inner radin 6 disc mustache; H is the distance between the partitions; h - the height of the partitions. 3 dw., 3 tab. (L 05 from 00

Description

The invention relates to the finishing treatment of parts and can be used in the under-heading industry when fine-tuning the marble.

The purpose of the invention is to increase productivity, improve the geometrical parameters and reduce the spherical size of the balls by equalizing the processing conditions in the working areas.

FIG. 1 shows a device for the implementation of the proposed method section; in fig. 2 - working area formed by a V-shaped groove with partitions; in fig. 3 - the same for the groove of the semicircular profile.

A device for implementing the inventive method comprises a presser disk 1 and a driving disk 2 associated with a drive, with annular grooves 3 formed at its end to accommodate the balls 4 being processed, between which there are partitions 5. There is an electromagnetic coil 6 for creating a magnetic field. The presser and driving disks They are made of a soft magnetic material, for example steel 10, and partitions 5 are made of a diamagnetic material in order to eliminate the loss of a magnetic field.

The method of finishing the balls is carried out as follows.

Before loading the balls into the working zones formed by the grooves 3 and partitions 5, paste having ferromagnetic properties is poured, then the balls are laid, the pressure plate 1 is lowered with a certain force, the electromagnetic coil 6 is turned on and the drive of the drive disk 2 rotates

In order to more fully hold the paste, an electric current is applied to the electromagnetic coil simultaneously with the application of a clamping force. This makes it possible, due to magnetic forces, to prevent the overflow of the paste through the partitions and its ejection from the working area.

The amount of paste for each groove is determined according to the expression

V; SR, + (0,2,. ..P, 6) () jiHh,, (1)

where V- is the volume of the paste laid in the i-th groove;

S is the cross-sectional area of the groove on the disk;

RJ is the radius of the i-th groove;

Where

(

., 0.6) K - the coefficient of filling with the paste between the partitions; H „- outer radius of the disk; Kg is the inner radius of the disk; H is the distance between partitions;

h - the height of the partition. The first term in the formula determines the volume of the paste in the groove itself, and the second, the volume of the paste held by the partitions.

For the grooves of the V-shaped profile, the expression (1) takes the form

., 40.2, ..., 0.6),,

(2) angle groove profile.

i

For the grooves of the semicircular profile, the expression (1) has the form

sin / b) + (0,2 ,.

., 0.6)

(3)

Where

g is the radius of the semicircular profile; fi is the central angle of the arc groove profile. Example. The method of finishing the balls is carried out with different ways of imposing a magnetic field on the pressure disk and filling the space between the partitions with paste.

Comparative studies are carried out at the technological operation of the first finishing of balls according to the 111th degree of accuracy. The adjustment of balls with a diameter of 25.4 mm (produced on a machine model VS-D204 with disks with an outer diameter of 800 mm in three annular grooves of the V-shaped profile for 8 hours. The adjustment modes of both batches are set to be identical. At that the ball is 50 N, and the rotational speed of the disk with partitions is 4.5 s. The coil has 3000 turns of wire with a diameter of 0.8 mm and an electric current of 0.5 is applied. The composition of the finishing paste is used with the following components, wt.%: electrocorundum white (22 .. 24) AM 14,15-16; iron powder PJ 1-2 1-2 6.0-6.5; machine other oil 58-60; paraffin 15; synthetic fatty acid fractions 5-6. This paste has a magnetic property.

- 1342698

The coefficient K (0,2, ..., 0, b) is the size of the paste between the disks. Experiments x () - (3) determined the experimental data on the definition of K by mental means, it limits the data in table. one.

Table 1

 mm, where the indices p, c, c, respectively. 2

table 2

289 413 573

370 413 480

The test results are given in table 3.

I method of dosing pasta without imposing a magnetic field (known)

200

in various grooves presented in

Table 3

155

1.1

1.3

1.6

II method of dosing the paste without imposing a magnetic field 184 178 170 1.3 1.3 1.4

With the imposition of a magnetic field

220 211 208 1.0 1.0 1.1

Thus, the imposition of a magnetic field and the dosed supply of paste into the grooves ensure a reduction in the spatiality of the balls and a deviation from the spherical shape with an increase in the productivity of the treatment.

The increase in removal of the allowance when applying a magnetic field is due to the fact that the paste does not flow from the central grooves into the peripheral and its discharge from the working area. In addition, an increase in the removal rate ensures an orderly orientation of the abrasive grains of the paste.

From a physical point of view, the efficiency of finishing the balls when applying a magnetic field is due to an increase in the plasticity of the surface layer of the metal, which facilitates the processes of micro-cutting

When the paste is dosed and the flow is eliminated in the peripheral groove, the intensity of the paste decreases due to the reduced abrasive effect of the paste, while the central groove, on the contrary, increases the benefits (5 increases the amount of paste in all work areas.

Claims (1)

Invention Formula The method of finishing balls by running them between two discs with Continued table. 3 25 20 30 g 0 five the force at which the balls with liquid lapping paste are placed in the working zones formed by annular grooves formed in the lower disk and annular partitions installed between them, which is characterized by the fact that, in order to improve the geometric parameters and reduce the size of the balls when fine-tuning, in the treatment areas, an additional magnetic field is created, sufficient to hold the paste between the partitions, which are made of diamagnetic material, while using t paste with ferromagnetic properties, and the amount of paste fed into each groove is determined from the expression V. SR; + (0,20,6) (K „-Kv) LN, where V is the paste volume, laid in the i-th groove; S is the cross-sectional area of the groove on the disk; RJ is the radius of the i-th groove; 0.2, ..., 0.6 is the paste filling ratio between the partitions; R is the outer radius of the disk; Rg is the inner radius of the disk; H is the distance between partitions; h, is the height of the partition. FIG. Editor And, Gorna Compiled by I. Malkhazov Tehred A. Kravchuk 4584 / 1D Circulation 714 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4 Proofreader I. Muska