Transmission sleeve and manufacturing method thereof

Abstract

The invention aims at providing a transmission sleeve and a manufacturing method of the transmission sleeve. A body is provided with an inner circular hole for installation and provided with protrusions assisting in fixing. The transmission sleeve can well adapt to a transmission shaft and is prepared from 0.3-0.8% of ZnSt, 0.5-2.0% of Ni, 0.2-1.5% of Mo and the balance stainless steel powder. Thetransmission sleeve can well meet the standards of the density and the hardness, and the manufacturing method comprises the steps of mixing, pressing, sintering, honing, polishing, cleaning and detection. The powder metallurgy technology is adopted, the manufacturing method is mature and efficient, magnetization is not likely to be caused, the product accuracy rate is improved, cutting is avoided, and the cost is low.

Description

technical field [0001] The invention relates to the field of transmission sleeves, in particular to a transmission sleeve and a manufacturing method thereof. Background technique [0002] The transmission sleeve is used for the connection between the vacuum pump drive shaft and the rotor. The product requires a certain strength and toughness, not easy to break, and has a good anti-rust effect. Since the product weighs only 1g, it requires not only a certain hardness, but also good toughness and good rust resistance. Due to the small size and complex shape of the product, it is difficult to process steel parts. Although the rigidity is good, the toughness is poor and it is easy to break, causing the pump to be stuck and the anti-rust effect is poor; if iron-based powder metallurgy parts are used, the strength cannot be reached when the density is low. It is realized that when the density is high, the damage to the mold is great, the cost of the mold consumption is too high,...

AI Technical Summary

Problems solved by technology

Due to the small size and complex shape of the product, it is difficult to process steel parts. Although the rigidity is good, the toughness is poor and it is easy to break, causing the pump to be stuck and the anti-rust effect is poor; if iron-based powder metallurgy parts are used, the strength cannot be reached when the density is low. It is realized that when the density is high, the damage to the mold is great, the cost of the mold consumption is too high, and the anti-rust effect is poor; the stainless steel powder metallurgy parts can be pressed to a very low density (6-2-6.4g / cm³) and the damage to the mold is small. The matrix shrinks violently through high-temperature sintering, and the density can reach about 7.0g / cm³, resulting in good strength and toughness, and stainless steel has good anti-rust performance

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