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 value shall not be less than the minimum radial crushing strength speci? Grades available in three bronze base compositions identifiable by different graphite contents and one leaded bronze grade and Type Grades 1 and 2 are available in four types described by specific density ranges.

The maximum static bearing load should not exceed psi [60 MPa] of projected bearing area length times inside diameter of bearing for this material. B Outside diameter tolerances are the same as for? Dimensions and Tolerances 9.

Press Fit min, in. Is surface finish an important design feature, where, how to measure? For housings rigid enough to withstand the press? It is assumed that ground steel shafting having a recommended? Dimensions and Tolerances 9.

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Desigining for P/M

Standard chamfer tolerances are also listed in Table X1. The part specification or drawing should provide as much additional information regarding the part use as possible.

The size limitation of PM parts is based on powder compressibility and press tonnage. Oil content of bearings shall not be less than the prescribed value for each grade and type of material. The material shall conform to the required chemical composition for copper, tin, graphite, iron, lead, zinc, nickel, and antimony.

ASTM B / BM – 05 Specification for Bronze Powder Metallurgy (P/M) Bearing (Oil-Impregnated)

B483 maximum running clearances will automatically be held within good design practice for average conditions. A superscript epsilon e indicates an editorial change since the last revision or reapproval. Thanks for contacting us. To obtain oil-free chips, the parts selected for test shall have the oil extracted in accordance with Test Method B if necessary.

This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? The b4438 questions are most important for the material and process selection: Last previous edition approved in as B — 00a. The green bearing shall be sintered at a time—temperature relationship to produce a microstructure that is essentially alpha bronze and contains no tin-rich phases visible at The lower length to diameter and or length to wall thickness ratios, the easier asm becomes to maintain uniform density throughout the part.

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This standard does not purport to address all of the safety concerns, if any, associated with its use. Lubricant content may be veri? Will the part be machined—which surfaces, what tolerances?

Is there a region critical to the performance of the part? Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.

Any defect or failure shall be cause for rejection of the lot. The testing procedure and material strength requirements of the? Exposure shall be 5 min.

Current edition approved April 1, This abstract is a brief summary of the referenced standard. Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm.

The part combinations are only limited to the design concept. Flanged bearings shall be tested by cutting off the? Workmanship, Finish, and Appearance With some manufacturing processes, producing the desired surface finish on a part can require an additional finishing process.