Method and apparatus for manufacturing a contoured internal diam

Details Method and apparatus for manufacturing a contoured internal diam Method and apparatus for manufacturing a contoured internal diam

1979-05-14

1981-09-22

Smith, Gary L.

Abrasive tool making process, material, or composition

With carbohydrate or reaction product thereof

51227R, 51290, 51324, 72370, 72402, 59 8, B24B 100, B24B 540

Patent

active

042902363

ABSTRACT:
PCT No. PCT/US79/00322 Sec. 371 Date May 14, 1979 Sec. 102(e) Date May 14, 1979 PCT Filed May 14, 1979 WO80/02526 Nov. 27, 1980
The ends (14,16) of cylindrical bushings 10) in which pins rotate bear relatively heavy loads. This can lead to a slight internal deformation of the bushing (10) which can interfere with free rotation of the pin. Such a problem is encountered, for example, with track pin bushings. A solution to this problem is to contour the ends (14,16) of the bushing (10) so that the inner diameter thereof flares (28,30) outwardly toward the bushing ends (14,16). This has not previously been accomplished via a single relatively non-critical operation. In the present invention a first end (14) of a cylindrically bored tube (10) is compressed radially inwardly sufficient to force it to a reduced internal diameter (18). The tube (10) is then bored axially inwardly while it is compressed with a boring tool (22) which bores a hole of a diameter (21) greater than the diameter (18) induced by the compressing. After the boring, the end (14) is released and its external dimension (24) returns towards its uncompressed size.

REFERENCES:
patent: 839776 (1906-12-01), Lewis
patent: 1493515 (1924-05-01), Berthold
patent: 1895819 (1933-01-01), Remington
patent: 2049841 (1936-08-01), Kjaer
patent: 2431702 (1947-12-01), McCann
patent: 2431764 (1947-12-01), McCann
patent: 3160420 (1964-12-01), Simpson
patent: 3685216 (1972-08-01), Frey

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