Method for preparing bearing outer ring through powder metallurgy

Abstract

The invention discloses a method for preparing a bearing outer ring through powder metallurgy. The method comprises the following steps: the bearing outer ring is prepared from the following raw materials in percentage by weight: 0.6 to 0.7 percent of nickel, 0.2 to 0.4 percent of cerium, 0.2 to 0.4 percent of chromium, 0.4 to 0.6 percent of molybdenum, 0.2 to 0.6 percent of corundum powder, 0.3 to 0.4 percent of zinc stearate, 1 to 2 percent of modified aid, 30 to 45 percent of calcium carbonate and the balance of iron. The modified aid is added and ultrafine powder which can be filled in gaps of large particles is provided in mixed raw materials, so that the apparent density of the mixed materials is improved; the main components of the ultrafine powder comprise nano-iron powder and calcium stearate; the novel modified aid obtained by aids such as a silane coupling agent further improves various physical properties, such as wear resistance, of the product; and iron powder and liquid paraffin as lubricating agents are added into the modified aid, so the effect of the modified aid during mixing pressing is enhanced, the strength of pressed blanks of a powder metallurgical structural piece is greatly enhanced under the same pressing pressure, the combining shape and the pore shape of the raw material particles are changed, and crack is avoided fundamentally.

Description

technical field [0001] The invention mainly relates to a powder metallurgy preparation method for a bearing outer ring, which belongs to the field of casting. Background technique [0002] With the continuous development of my country's economy, powder metallurgy structures are used more and more widely. As a near net shape technology, powder metallurgy has great economic advantages in the production of structural parts and other parts with large batches, high dimensional accuracy and high processing costs. However, there is a weakness in powder metallurgy structural parts: the compact strength of the product before sintering is very low, which leads to cracks easily appearing during the forming and handling process, and cannot be detected during the manufacturing process. This is a fatal defect in some applications such as key parts of automobiles, which leads to the application of powder metallurgy structural parts only to low- and medium-risk stress-bearing parts, an...

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Problems solved by technology

The material composition affects the manufacturing cost, the product density has a great influence on the loss of the molding machine and the mold, and the crack is mainly affected by the strength of the compact, and it is difficult to detect