High and low temperature resistant oil-retaining bearing made of powder metallurgy material and manufacturing method of high and low temperature resistant oil-retaining bearing

Abstract

The invention discloses a high and low temperature resistant oil-retaining bearing made of a powder metallurgy material and a manufacturing method of the high and low temperature resistant oil-retaining bearing. The high and low temperature resistant oil-retaining bearing is prepared from iron powder, copper powder, graphite powder, zinc stearate, tin, polyvinyl alcohol, ferrous sulfate and No.20engine oil. The manufacturing method comprises the specific steps of mixing, pressing, partition sintering, cooling and oil immersion. According to a process, the three temperature interval values andthe sintering time of the three temperature interval values are as follows: 600-650 DEG C is kept for 30 min, 750-850 DEG C is kept for 40 min, and 1040-1120 DEG C is kept for 90 min, thus a materialproduct can be well preheated in the earlier stage of sintering, and a lubricant and adsorbed gas in a blank can be well exhausted; and the material product which is sintered and recovered to the normal temperature is placed in a vacuum box and evacuated to -720 mmhg, then the No.20 engine oil is poured into an oil immersion device, the oil immersion device is heated to 80 DEG C and kept for 30-35 min, oil and the material product are better contacted and fused in the vacuum oil immersion device at the hot temperature, and therefore better oil immersion work is completed.

Description

technical field [0001] The invention discloses a high and low temperature resistant oil-impregnated bearing made of powder metallurgy material and a manufacturing method thereof, belonging to the technical field of bearing manufacturing. Background technique [0002] In the existing technology, when the high and low temperature resistant bearings are manufactured and sintered, they are mostly sintered at two temperature intervals. After the material is pressed, it directly enters a higher temperature interval, and the heat cannot be transmitted evenly. The entire body of the material cannot remove the lubricant and adsorbed gas in the billet; and during the oil immersion process, the normal temperature oil and the normal temperature material cannot be better contacted and fused in the normal temperature vacuum oil immersion device, resulting in The problem that the oil immersion effect becomes worse has a deficiency on the one hand. Contents of the invention [0003] The ...

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to overcome the fact that most of the existing saikosaponins have low purity, and their preparation has more residual impurities, and some impurities are ignored in the process of extraction, resulting in a large amount...