ASTM B438 PDF

ASTM B Standard Specification for Bronze-Base Powder Metallurgy (PM) Bearings (Oil-Impregnated). ASTM – B, Grade 1, Type II; MPIF – CTK26; Military – MIL-BD, Type I, Grade I (this spec only applies to Bushings & Washers. It must be requested. ASTM – B, Grade 1, Type II. Military – MIL-BD, Type I, Comp. A. MPIF – CTK Heavy industry uses Sintered Bronze as machinery components.

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This acceptance procedure can be very useful when evaluating multiple or repeat shipments of the same bearing.

Sintered bronze bearings shall be made by molding or briquetting metal powder mixtures to the proper density. It is therefore worthwhile to consider some of the guidelines of design related to the PM process. If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards, at the address shown below.

Too large a flange causes ejection difficulties. Special Tolerancein. This calculated value will be the minimum acceptable breaking load for that speci? Grade 3 is available in two types and Grade 4 is available in one type. Contractor shall furnish a percent composition analysis on an oil-free basis for each lot showing the percentage for each element as speci?

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Desigining for P/M

The manufacturer may, at his discretion, use ashm bronze powder in the mixed powder. Standard chamfer tolerances are also listed in Table X1. To obtain oil-free chips, the parts selected for test shall have the oil extracted in accordance with Test Method B if necessary. Will the part be welded?

The contractor may use their own or any other suitable facility for the performance of testing and inspection, unless an exception is stated. Is surface finish an important design feature, where, how to measure?

Their dimensions are referenced throughout the tolerance tables. Second, whole spherical bearings from the same lot are crushed, keeping their axes horizontal, to determine the breaking load of the whole bearing.

Bearing shall conform to this speci? Compression ratio—the ratio of the height of the loose powder filling the die to that of the compacted part—also tends to limit vertical part lengths.

B Outside diameter tolerances are the same as for? Current edition approved Nov. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. The edges of a part should be designed with chamfers rather than radii to prevent burring. An acceptance specification for the minimum bearing breaking load may be established for any specific standard oil-impregnated bearing.

Exposure shall be 5 min. Thanks for contacting us.

The test procedure and breaking load requirements for the? Four samples shall be made available for? This standard is subject to revision at any time by the responsible technical committee and must be reviewed every?

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A superscript epsilon e indicates an editorial change since the last revision or reapproval. During the period, beads shall exude uniformly from the bearing surface. It is determined by breaking plain, thin-walled bearings or hollow cylindrical test specimens under diametrical loading, following the procedure described in Test Method Band calculating the radial crushing strength according the material strength formula contained herein.

The shaping of a sintered bearing is essentially defined by the tool design and its manufacture. Will the part require heat treatment—what type?

Oil Impregnated Sintered Bronze / SAE Products

Originally approved in adtm Rejection should be reported to the producer or supplier promptly and in writing. Sintered bronze bearings are normally sized after sintering to maintain the dimensional characteristics required of the bearing. Combining values from the two systems may result in nonconformance with the speci? Must the part be burr-free—what type, amount of corner radius?

The lower length to diameter and or length to wall thickness ratios, the easier it becomes to maintain uniform density throughout the part.