SU827267A1

SU827267A1 - Press-mould for pressing powder articles

Info

Publication number: SU827267A1
Application number: SU792785589A
Authority: SU
Inventors: Петр Александрович Витязь; Валерий Константинович Шелег; Владимир Евгеньевич Романенков; Руслан Анатольевич Кусин; Лев Константинович Гудин; Моисей Давидович Резников; Эдуард Дмитриевич Яковлев
Original assignee: Предприятие П/Я B-8981
Priority date: 1979-06-25
Filing date: 1979-06-25
Publication date: 1981-05-07

Description

1one

Изобретение относитс к области порошковой металлургии, в частности к устройствам дл прессовани изделий из металлического порошка.The invention relates to the field of powder metallurgy, in particular, to devices for pressing articles from metal powder.

Известна пресс-форма дл прессовани изделий из порошка, содержаша эластичную камеру дл порошка, помеш,енную в матрипу, и пуансоны 1.A known mold for compressing articles from powder, containing an elastic chamber for powder, placed in a matrip, and punches 1.

Известна пресс-форма е обеспечивает равномерную передачу усили в осевом и радиальном направлении.Known mold e provides uniform transmission of forces in the axial and radial direction.

Известна пресс-форма, содержаш,а эластичный элемент, разъемную матрицу и пуансоны , выполненные в виде внутренних и наружных формующих элементов, причем последние выполнены с отверсти ми 2.A mold is known, containing, and an elastic element, a split matrix and punches made in the form of internal and external forming elements, the latter being made with holes 2.

Данна схема прессовани обуславливает неравномерное распределение пористости по высоте и диаметру брикета 1вследствие неравномерных осевой и радиальной деформаций эластичной камеры в процессе уплотнени порошка. Осева деформаци эластичной камеры происходит практически только под действием осевой нагрузки, приложенной К верхнему пуансону. Радиальна деформаци эластичной камеры происходит как под действием осевой нагрузки (раст жение), так и радиальной нагрузки, действуюш,ей со стороны, уплотн емого порошка (сжатие). Суммарна радиальна деформаци будет равна разности этих деформаций и, следовательно, будет много меньше осевой. Расчеты показывают, что отношение осевой деформации к радиальД л г НОИ составл ет 4 ...о.This pressing scheme causes an uneven distribution of porosity over the height and diameter of the briquette 1, due to the uneven axial and radial deformations of the elastic chamber during the compaction of the powder. The axial deformation of the elastic chamber occurs almost exclusively under the action of an axial load applied to the upper punch. The radial deformation of the elastic chamber occurs both under the action of an axial load (tension) and a radial load, acting from the side of the compacted powder (compression). The total radial deformation will be equal to the difference of these deformations and, therefore, will be much smaller than the axial one. Calculations show that the ratio of axial deformation to radial l and g NOI is 4 ... o.

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Известна нресс-форма 2 вл етс наиболее близким по технической сущностиKnown Nress Form 2 is the closest in technical essence.

и достигаемому эффекту аналогом предложенного технического решени .and the effect achieved is analogous to the proposed technical solution.

С целью повышени равномерности распределени пористости изделий предложена пресс-форма, отличающа с от известной тем,In order to increase the uniformity of the porosity distribution of the products, a mold has been proposed which differs from that known in

что матрица выполнена в виде симметричной цанги, состо щей из нескольких лепестков , внутренн поверхность наружных элементов выполнена конической -формы и охватывает лепестки, а внутренние элементы размещены в отверсти х наружных.that the matrix is made in the form of a symmetric collet consisting of several petals, the inner surface of the outer elements is made conical-shape and covers the petals, and the inner elements are placed in the openings of the outer.

На чертеже представлена предлагаема пресс-форма.The drawing shows the proposed mold.

Claims

The iress form consists of an elastic bushing element 1 for a metal sponge, a matrix 2 made in the form of a symmetrical collet consisting of three or more petals; two external conical punches 3 and 4 and two internal punches 5 and 6. The device operates as follows. When the punches 5 and 6 are removed, the metal powder is poured into the elastic sleeve 1. Then the punches 5 and 6 are installed. Loopson are applied with a load, under the action of which the powder is compacted. In this case, the inner punches 5 and 6 deform the elastic sleeve 1 and compact the powder in the axial direction. The outer punches 3, 4 transfer the force to the collet, which deforms the elastic sleeve 1 in the radial direction and compacts the powder. The load acting on the elastic sleeve on the collet side must be greater than the load acting on the sleeve on the powder side. In this case, the radial deformation of the inner surface of the elastic sleeve of the lod will be directed in one direction by the action of axial and radial loads (stretching). Consequently, the total radial deformation of the inner surface of the elastic sleeve in the proposed device under the same loading conditions and briquette parameters will be greater than in the known device. Calculations have shown that in the proposed device the ratio is 2 ... 2.5. The uniform axial and radial deformations of the elastic sleeve in the proposed device allow a uniform compaction of the powder in height and diaphragm, which means a more uniform distribution of porosity in height and the diameter of the briquette. . The elastic element is made in the form of a sleeve FROM polyurethane. The collet can be made of three or more petals with an angle of inclination of the cone forming 80 °. For products pressed in the proposed form, with an average value of 30.2%, the mean square deviation is 2.015, which indicates an increase in the uniformity of porosity distribution by 30%. The invention of the mold for pressing products from metal powder, containing an elastic element, a split matrix and punches, Made in the form of internal and external forming elements with holes, characterized in that, in order to increase the uniform distribution of porosity of products, the matrix made in the form of a symmetric collet consisting of several petals, the inner surface of the outer elements is filled with a conical shape and covers the petals, and the inner elements are placed in the openings of the outer s. Sources of information taken into account in the examination 1. S. Kiparisov, Lpbenson G. A. Poroigkova metallurgists, M., “Metallurgists, 1972, p. 256.

2. USSR Author's Certificate No. 307847, class B 22F 3/02, 1968.