SU1191200A1 - Method of machining shells of sliding-contact bearings - Google Patents

Description

The invention relates to metal processing and can be used in the processing of the inner cylindrical surfaces of the sliding bearing shells, split in 5 blocks, etc.

The purpose of the invention is to increase the resistance of the cutter due to the fact that a large, rough part of the allowance for processing is removed by one, rough tooth of the cutter, and the smaller, finishing part of the allowance is removed in one pass by a finishing tooth, which determines the size and quality of the machined surface. As a result, the wear of the cutter's new tooth practically does not affect the period of resistance of the cutter, which is completely dependent on the wear of a low-loaded final tooth.

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FIG. 1 shows the liner processing circuit; in fig. 2 - a device for implementing the method.

The proposed method is as follows. 25

The workpiece liner 1 is placed in the matrix 2, is fed down and pressed against the lower spring-loaded support 3.

The distance between the axes of the liner and the cutter 4 is 00 ^g . The second tooth of the cutter has an excess relative to the first by the value of the finishing part of the stock.

The cutter 4 is oriented relative to the workpiece liner so that first in contact with it could be entered the 1st tooth of the cutter.

The insert 1, fixed between the die 2 and the support 3, is moved along the guides 5 to the rotating cutter 4. At a distance of 0 ^ 0 'between the axes of the insert and the cutter, the 1st tooth enters the cutting, which / part removes part 6 of the total allowance b for processing . At the time of exit from 45 cutting of the 1st tooth of the cutter, the insert is retracted and the 2nd tooth of the cutter passes during half of its revolution through the air. Next, the liner is again fed to the mill and with a distance of 0 ^ 0 ¹ ₅₀

between the axes of the liner and the cutter, the 1st tooth of the cutter removes part 7 of the total allowance Ιι for processing. The insert is retracted, and the 2nd tooth of the cutter passes through the air. 55

On subsequent passes, the 1st tooth of the cutter removes parts 8.9 and 10 of the total allowance b, respectively, at

distances 0 ^ 0 ’, 0 ^ 0 'and 0 ^ 0' between the axes of the liner and cutter. At the time of exit of cutting the 1st tooth of the cutter after removing part 10 of the total allowance b, the 2nd tooth of the cutter enters the cutting, removing the part

11 total allowance equal in size. the excess of the 2nd tooth relative to the 1st and which is the finishing part of the allowance.

At the moment when the teeth of the cutter go to the line 0 ^{, (} - O ", the liner is retracted to its original position (001), it is unloaded from the die, the workpiece is loaded and the process is repeated.

FIG. 1 shows the position of the teeth of the cutter and the allowance removed by them with each turn of the cutter and changes in the distance between the axes of the cutter and the liner when moving the insert to the cutter. FIG. 1 shows the position of the teeth of the cutter: 1 ^ -2, during the first half of its first revolution; 1 ₂ ~ 2 ^ - during the first half of its second turn; 1 ^ - 2 during the first half of its third turn ·, Ι ^ - 2 ^ - during the first half of its fourth turn; 1 $ 2 ₅ ~ during the first half of its fifth turn; 2 $ - 1 ^ - during the second half of its fifth (last) turn.

'As can be seen from the diagram, the total allowance 1 b for processing cylindrical

the surface of the liner is removed at five rotations of the cutter, and the 2nd tooth works only during the second half of the 5th revolution of the cutter, removing the finishing part of the allowance for final processing equal to the excess of the second tooth relative to the first one. This keeps the cutting edge * Ζ-γο of the cutter tooth in good condition and ensures the required roughness and accuracy of the surface to be treated for a long time. As a result, the time spent on tool changes is reduced.

In the device for implementing the proposed method of moving the liner 1 installed between the matrix 2 and the support 3, carried out by a cam 12, a pusher 13 installed in the guides 14, a lever 15, whose shoulders interact with the matrix and the pusher. Support 3 podpruzhiz 119

Yen - in the direction of the matrix spring

16 discharging matrix

with the appropriate provisions of the cam 12.

Sections 1-, 2- ,, ^ 2 "2 ^, 1 ^, 2 ^, 1 ^, 5 21 _? and $ 2 on the cam 12 interact with the pusher roller with the corresponding positions of the cutter teeth relative to the liner due to the kinematic connection between the rotation

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cutters and cam (not shown in the drawing ^ the teeth of the cutter relative to the liner and the cam 12 relative to the pusher shown in the end processing position.

The claimed technical solution provides the possibility of improving processing performance by increasing the resistance of the cutter.

Ι19Ι2ΟΟ

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Faye. 2

Claims (1)

. METHOD FOR TREATING SLIPTED BEARING INSERTS with a two-bit cutter, namely. the workpiece liner is placed in the matrix, served on the mill to completely remove the allowance for processing, and output the processed insert from the contact with the cutter is carried out at the moment when both teeth of the cutter are outside the insert, characterized in that, in order to increase the resistance of the cutter, its second tooth is exceeded relative to the first tooth by the value of the finishing part of the allowance, the rough part of the allowance is removed first tooth, while the workpiece is removed from the second tooth at the time the first tooth comes out of contact with the workpiece, and during the last revolution of the cutter in a cycle, the finishing tooth is taken out § parts allowance second tooth cutters. 1 1191200 2