A powder metallurgy method and product for preparing a bearing sleeve of an automobile seat lifter

Abstract

The invention discloses a method and a product for preparing a bearing sleeve of an automobile seat lifter by powder metallurgy, belonging to the technical field of powder metallurgy production. The method is specifically carried out according to the following steps: (1) powder mixing; (2) forming; (3) sintering; (4) machining; (5) heat treatment; (6) finishing; (7) polishing and degreasing. The advantages are: 1) Using a special lubricant, a higher pressing density can be obtained under a lower pressing pressure, and the final structural shape of the bearing sleeve can be formed at one time, reducing mold loss, and its material utilization rate can reach more than 99%; 2) The product has good consistency, high precision, and does not require excessive machining processes; 3) The use of diffusion alloyed steel powder can make the material alloyed more uniformly and fully at a lower sintering temperature, and improve the strength and dimensional accuracy of the bearing sleeve ; 4) Using the existing production equipment, the output of one press shift is 2000-2500 pieces, which is only equivalent to 60% of the original cold pier molding.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy production, and in particular relates to a powder metallurgy preparation method of a bearing sleeve, and also relates to a product obtained by the method. Background technique [0002] The car seat lifter is an important part of a small car. It can be used not only to adjust the height of the car seat, but also to adjust the angle of the seat cushion to make the passenger and the driver sit more comfortably. These actions require lifter bearings It is completed with the cooperation of the set. The existing car seat lifter bearing sleeves include sleeves, steps and bosses. The bearing sleeves have complex structures, not only require high dimensional accuracy, but also need to be able to withstand high torsion and impact forces. Traditional machining methods are basically unable to produce. , Most of the blanks are processed by cold pier molding, and then machined into shape, and the mat...

AI Technical Summary

Problems solved by technology

The existing car seat lifter bearing sleeves include sleeves, steps and bosses. The bearing sleeves have complex structures, not only require high dimensional accuracy, but also need to be able to withstand high torsion and impact forces. Traditional machining methods are basically unable to produce. , mostly use cold pier molding to process the blank, and then machine it into shape, and its material is mostly 45 # steel

The problem is that due to the complex structure of the bearing sleeve, the structure of the cold pier mold is also very complicated, and the mold strength requirement is high, the corresponding mold cost is high, and the mold consumption is large, which greatly increases the production cost; Due to the limitations of the product, the product has low precision, poor consistency, and a large amount of machining, requiring more machining to meet the final shape and accuracy requirements of the product, resulting in low production efficiency and low material utilization.

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