SU1599157A1 - Method of producing parts from metallic powders - Google Patents

Abstract

The invention relates to powder metallurgy, in particular, to methods for producing parts from metal powders with a large pressing surface. The goal is to expand the technological capabilities of the method by obtaining large-sized parts. Metal powder is poured into the mold with a replaceable insert and pressed to the desired density of the part. Similarly pressed subsequent elements, using the previous ones as the mold. The method allows to obtain large surface products with a relatively high and uniform density using medium power presses. 5 il.

Description

The invention relates to powder metallurgy, in particular, to the technology of manufacturing parts from metal powders with a large press surface.

The purpose of the invention is to expand the technological capabilities of the method by obtaining large-sized parts.

Figures 1, 2 and 3 are diagrams illustrating the manufacturing sequence, details in a mold; figure 4 - the rotor magnetic core with a breakdown into structural elements; figure 5 - powder rotor motor assembly.

The mold includes ferrule 1 concentric punches 2,3 and 4, which form compacts 5, 6 and 7, respectively, as well as rod 8, forming a shaft bore and rods 9, forming holes for the rotor winding. The positions 10, 11 and 12 denote concentric elements into which the product is divided, on the basis of ensuring the achievable density of the compacts.

Economically feasible to achieve: - - the density of the compacts will be 7 g g / cm, which is slightly more than 91% of the ideal density. This density

ate

is achieved at a pressure of 8 cu / cm. With a maximum press force of 160 cu, in order to achieve a density of 7.1 ton / cm 3, parts or their parts with a surface area of not more than 160 cu should be pressed: S 8 ts / cm 20 cm .

The magnetic circuit having an end surface area of 56 cm is divided into three concentric elements with the front face of each of them equal to 18–20 cm.

To form the ring 10, the pressed powder is poured into the space between the sleeve 1j by the punch 3 and the forming rods 9 (Fig. 1). The punch 2 forms the presses 5 of the outer ring 10 with holes for winding. In this case, the pressing force for achieving the target density is quite achievable on widely used equipment. Then, the punch 3 is removed, poured into the space between the punch 4 and

pressing 5 new batch of powder and

pressed it with a punch 3 (). In this process, pressing 6 is formed in the area of pressing 5, it is additionally compacted by lateral forces and tightly clashes with it. At the next stage of the process, a punch 4 is drawn, the space between the pressing and the rod 8 is filled with powder and pressed with a punch 4 (FIG. 3) The pressing 7 is formed between the pressing 6 and the central core 8 and also forms a single whole with the previous pressing 5. L since the radial size of the compression elements 10,11 and 12 is in this end

// II

0

15 20 25

17.10 and 11 mm, respectively, the density of compacts in the horizontal direction will be negligible. The pressing of the magnetic conductor manufactured in this manner (Fig. 4) is removed from the press-form and subjected to sintering in the endogas medium at + 1150 ° C,

If the rotor were made according to the traditional technology used in powder metallurgy, then to achieve a given part density, a pressing pressure of 56 cm X 8 tf / cm 432 tf is necessary. It does not guarantee uniformity of part density.

Using the proposed method provides parts with a relatively high and uniformly distributed density when using presses of medium power, while providing the necessary specific pressure and strength of the connection of structural elements of the part

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Invention Formula

A method of manufacturing parts from metal powders, comprising pressing the first element of a part in a mold with a replaceable central part and pressing the subsequent elements of the part using a mold as a mold, in this case that, in order to expand the technological capabilities of the method by obtaining large-sized parts, each element is pressed to the final predetermined density of the part.

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Fig: 4

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Editor A.Dolinich

Compiled by I. Poimenov Tehred L. Oliynyk Proofreader S. Cherni

Order 3109

Circulation 645

VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Raushskv nab. 4/5

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Production and Publishing Combine Patent, Uzhgorod, st. Gagarin, 101

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Claims (1)

Claim A method of manufacturing parts from metal powders, comprising pressing the first element of the part in a mold with a replaceable central part and pressing subsequent elements of the part using the previous ones as a mold, characterized in that, in order to expand the technological capabilities of the method by producing large parts, each element is pressed to the final specified density of the part. Figure 1 .1599157 Fig.Z Fig