Oil-impregnated Sintered Bearing And Production Method Therefor
A manufacturing method and bearing technology, applied in the directions of bearings, bearing components, shafts and bearings, etc., can solve problems such as insufficient oil film formation, and achieve the effect of suppressing the generation of scratching noises
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no. 1 Embodiment
[0078] As raw material powders, powders of the following (1) to (5) were prepared.
[0079] (1) Porous iron powder A: Specific surface area: 200m 2 / kg, 140 mesh sieve: 19.2%, 140 mesh sieve and 325 mesh sieve: 54.7%, and 325 mesh sieve: 26.1% particle size distribution
[0080] (2) Porous iron powder B: specific surface area: 100m 2 / kg, 90-mesh sieve: 2.8%, 90-mesh sieve and 145-mesh sieve: 24.3%, and 140-mesh sieve: 72.9% particle size distribution, the powder on the 90-mesh sieve has pores of 50 μm or more inside the powder Proportion to this powder: 85%, Proportion of powder with pores less than 40~60μm inside the powder under 90 mesh sieve and above 140 mesh sieve to this powder: 65%
[0081] (3) Electrolytic copper powder: the powder under the 145 mesh sieve and on the 350 mesh sieve is 80~90% by mass
[0082] (4) Foil-shaped copper powder: the powder under the 100-mesh sieve and on the 350-mesh sieve is 35~55% by mass
[0083] (5) Tin powder: under 325 mesh sieve. ...
no. 2 Embodiment
[0095] The porous iron powder A prepared in the first example was sieved with a 140-mesh sieve and a 325-mesh sieve, and classified into a powder on the 140-mesh sieve, a powder on the 140-mesh sieve and on the 325-mesh sieve, and a 325-mesh sieve The three types of powders below were mixed in the ratios shown in Table 2 to prepare porous powders A with different particle size distributions. It should be noted that in Table 2 and subsequent tables, "-#nnn" refers to the powder under the nnn mesh sieve, and "+#mmm" refers to the powder on the mmm mesh sieve. To these porous iron powders A, 8.8% by mass of the porous iron powder B prepared in the first embodiment (the amount of the porous iron powder becomes 90% of the iron powder), 5% by mass of the electrolytic copper powder, Raw material powders consisting of 6% by mass of foil-shaped copper powder and 1% by mass of tin powder were molded and sintered in the same manner as in the first example, thereby producing sintered body...
no. 3 Embodiment
[0104]The porous iron powder B prepared in Example 1 was sieved through a 90-mesh sieve and a 140-mesh sieve, and classified into a powder above the 90-mesh sieve, a powder below the 90-mesh sieve and above the 140-mesh sieve, and a 140-mesh sieve. The three types of powders below were mixed in the ratios shown in Table 3 to prepare porous powders B with different particle size distributions. The porous iron powder A used in the first example was used to add 8.8% by mass of the porous iron powder B (the amount of the porous iron powder A becomes 90% of the iron powder) and in the first example Using raw material powders of 5% by mass of electrolytic copper powder, 6% by mass of foil-shaped copper powder, and 1% by mass of tin powder, they were molded and sintered in the same manner as in the first example, and sample numbers 11 to 14 were produced. sintered samples.
[0105] For these sintered body samples, the area ratio of pores, the total number of pores, and the ratio of ...
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