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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Oil Impregnated Sintered Bronze / SAE Products
Sintered bronze bearings are normally sized after sintering to maintain the dimensional characteristics required of the bearing. The appropriate layout of the components geometry and the selection of suitable material according b4388 the PM process has a strong influence on tool life and consequently on the price of astj part. Press Fit min, in. This standard does not purport to address all of the safety concerns, if any, associated with its use. Originally approved in The values stated in each system are not exact equivalents; therefore, each system shall be used independently of the other.
Materials and Manufacture 4. Press Fit min, in. The edges of a part should be designed with chamfers rather than radii to prevent burring. Is there a region critical to the performance of the part? The operating environment b483 be carefully considered: Closer tolerances can be held with special tooling or processing, or both.
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. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.
ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date. A representative sample of chips may be obtained by milling, drilling,?
Desigining for P/M
Dimensions and Tolerances 9. This specification covers sintered bronze, oil-impregnated bearings made primarily from elemental copper, tin, lead, and graphite powders.
A superscript epsilon e indicates an editorial change since the last revision or reapproval. For housings rigid enough to withstand the press? It is informational only and not an official part of the standard; the full text aastm the standard itself must be referred to for its use and application.
Oil Impregnated Sintered Bronze – plate, cored bar, solid bar & bushings
The Government reserves the right to perform an inspection set forth herein to assure supplies and sources conform to the prescribed requirements.
Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. Will the part be machined—which surfaces, what tolerances? B348, only minimum recommended clearances are listed in Table X1. Must it be leak tight?
Contractor shall furnish a percent composition analysis on an oil-free basis for each lot showing the percentage for each element as speci? Super Sintered Iron Material Specifications. Repeated start-stop operation, oscillatory or reciprocating motion, high speeds, shock loads, and temperature extremes tend to decrease permissible loads.
B Outside diameter tolerances are the same as for? The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
Usually these apply only when speci? A number in parentheses indicates the year of last reapproval.
As a general rule, walls should not be thinner than 0. The maximum static bearing load should not exceed psi [60 MPa] of projected bearing area length times inside diameter of bearing for this material.