Pressure device and method for thin-walled powder metallurgy shaft sleeve

Abstract

The invention provides a pressure device and method for a thin-walled powder metallurgy shaft sleeve. The device comprises a template, wherein a lower die is fixed on the template. The device is characterized in that a pressing die is fixed in the lower die; an inner hole in the pressing die is the same as the excircle of the powder metallurgy shaft sleeve; a core rod is mounted in the center of the pressing die; the excircle of the core rod is the same as an inner hole in the powder metallurgy shaft sleeve; the inner hole in the pressing die and the excircle of the core rod are combined to form a die cavity for pressing of the powder metallurgy shaft sleeve; an ejecting sleeve for pushing out the powder metallurgy shaft sleeve is arranged on the excircle of the core rod; the lower end of the ejecting sleeve is connected with an ejecting device capable of moving up and down; an upper punch connected with a punch press sliding block is arranged above the die cavity; the front end of the upper punch takes the shape of a circular tube matched with the die cavity; a powder feeding pipe for a power metallurgy material is arranged above the die cavity, and can move left and right; a material pushing plate is connected with the front end of the powder feeding pipe; when the powder feeding pipe moves to the die cavity, the material pushing plate pushes the powder metallurgy shaft sleeve to move out of a punching area; a graphite powder material is added into the power metallurgy material, and the weight of the added graphite powder material accounts for 1-2% of the total weight.

Description

technical field [0001] The invention relates to the manufacture of powder metallurgy shaft sleeve parts, in particular to the manufacturing equipment and method of thin-walled powder metallurgy shaft sleeves. Background technique [0002] Most of the products made of powder metallurgy bushing parts that we routinely make have a wall thickness of more than 1 mm. Powder metallurgy bushing products with a wall thickness of less than 1 mm are difficult to produce, or even impossible. At present, when some powder metallurgy products of shaft sleeves with very thin wall thickness are made, they are first pressed into bushes with thicker wall thickness (thickened during pressing). After the sintering process is completed, the wall thickness is reduced by metal cutting. It is troublesome to process it until it is thinner, and it wastes raw materials and increases manufacturing costs. Moreover, because the wall thickness is too thin, it is easy to deform during clamping and other pr...

AI Technical Summary

Problems solved by technology

At present, when some powder metallurgy products of shaft sleeves with very thin wall thickness are made, they are first pressed into bushes with thicker wall thickness (thickened during pressing). After the sintering process is completed, the wall thickness is reduced by metal cutting. Re-processing to thin, this method is more troublesome, and wastes raw materials, increases manufacturing costs, and because the wall thickness is too thin, it is easy to deform during processing and clamping, and the quality is difficult to guarantee

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