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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The contractor may use their own or any other suitable facility for the performance of testing and inspection, unless an exception is stated. A superscript epsilon e indicates an editorial change since the last revision or reapproval.

Therefore, only minimum recommended clearances are listed in Table X1. A superscript epsilon e indicates an editorial change since the last revision or reapproval. This standard is n438 to revision at any time by the responsible technical committee and must be reviewed every? Combining values from the two systems may result in nonconformance with this speci? As a general rule, walls should not be thinner than 0.

Contractor shall furnish a percent composition analysis on an oil-free basis for each lot showing the percentage for each element as speci?

These supplementary requirements shall appear separately.

Oil Impregnated Sintered Bronze – plate, cored bar, solid bar & bushings

Then, using the minimum radial crushing strength for the grade and type of oil-impregnated bearing sstm from Table 5 for K in the breaking load formula and the measured dimensions of the body, a Pmin value may be calculated.

Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phoneqstmor service astm. 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 Flanges A comparatively small flange, step, or ashm can often be produced by machining a shelf or step in the die.

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The contractor may use their own or any other suitable facility for the performance of testing and inspection, unless xstm exception is stated. Fill out the form below for a complimentary copy of our catalog by mail, or click here to view a digital copy. For acceptance, the radial crushing strength, determined on the test bearings, shall not be less than the minimum strength speci? Reference military standard speci?

Special tolerances should not be speci? The manufacturer may, at his discretion, use prealloyed bronze powder in the mixed powder. Lubricant content may be veri?

Press Fit min, in. An acceptance specification for the minimum bearing breaking load may be established for any specific standard oil-impregnated bearing. Last previous edition approved in as B — 00a. Bearings are a natural product for PM because of its controlled porosity and the resulting self-contained lubrication. The maximum static bearing load should not exceed psi [60 MPa] of projected b43 area length times inside diameter of bearing for this material.

Desigining for P/M

The density of bearings supplied impregnated with lubricant shall be within the prescribed limits. These bearings have slightly higher strength constants and slightly lower oil content. After sizing and inspection, they are impregnated with a lubricating oil unless otherwise speci?

Bottom flange edge and juncture radii should be generous Shapes with uniform dimensions in the pressing direction are easiest to produce and eject from the press. The size limitation of PM parts is based on powder compressibility and press tonnage.

Current edition approved April 1, Grade 3 is available in two types and Grade 4 is available in one type.

Lack of appreciable sweating of the lubricant on the bearing surface will be cause for rejection. Materials and Manufacture 4. A number in parentheses indicates the v438 of last reapproval. B Outside diameter tolerances are the same as for? Usually these apply only when speci? Will the part be welded?

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This will be the minimum bearing breaking load required for the body of that speci? Contractor shall furnish a percent composition analysis on an oil-free basis for each lot showing the percentage for each element as speci?

Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. Sintered bronze bearings shall be made by molding or briquetting metal powder mixtures to the proper density. Link to Active This link will always route to the current Active version of the standard. Parts can be uniquely shaped or designed to combine two single parts into a complex, one-piece PM part.

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

ashm If you feel that your comments have not received a fair hearing you should make your views known sstm the ASTM Committee on Standards, at the address shown below. The operating environment should be carefully considered: Then, using the correlation formula, the speci? Historical Version s – view previous versions of standard.

Special Tolerancein. This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? With some manufacturing processes, producing the desired surface finish on a part can require an additional finishing process.

The viscosity should be speci?

ASTM B / BM – 00 Standard Specification for Sintered Bronze Bearings (Oil-Impregnated)

The maximum running clearances will automatically be held within good design practice for average conditions. Press Fit min, in. This abstract is a brief summary of the referenced standard.

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