RU2015844C1 - Device for manufacture of articles from powder materials - Google Patents

Abstract

FIELD: manufacture of articles from powder materials. SUBSTANCE: after molding of article 11, molding punch is removed from die 1 and ejecting unit is installed instead by aligning annular protrusions 6 of body 5 and recess 7 on die 1. Article 11 is ejected by tightening the die, by application of pressure to sleeve-shaped body 5 of ejection unit. EFFECT: higher efficiency. 2 dwg

Description

 The invention relates to powder metallurgy, in particular to devices for the manufacture of products from powder materials.

 A device for manufacturing products from powder materials is known, containing a die, punches, one of which (lower) is fixedly mounted, and the other (upper) is able to move inside the matrix.

 The disadvantages of this device are: the low quality of the molded products due to the possible occurrence of chips, cracks and macro-fractures in them at the time of pressing, as well as the limited technological capabilities of the device that does not allow to obtain high-quality, large-sized in terms of products (for example, with a diameter of more than 300 mm and a thickness of less 10 mm) from various powder materials, including high-modulus molybdenum, tungsten and other materials, without the use of special plasticizers and vyazuyuschih substances.

 Also known is a device for manufacturing products from powder materials, selected as a prototype, containing a matrix mounted on elastic elements, an upper (movable) that can move inside the matrix, and lower (fixed) punches.

 The main disadvantages of the prototype device should be attributed to the low quality of the products obtained, since cracks, chips, and damage may occur in the products at the time of pressing out as a result of uneven redistribution of the pressing pressure over the surface of the manufactured products and the distortion of the latter when they exit the matrix, which is typical for thin ( less than 10 mm thick) of the compacts, as well as the narrow scope of the devices under consideration that do not allow obtaining high-quality large-sized products in terms of, for example, with a diameter of more than 300 mm and a height of less than 10 mm, especially from high-modulus materials (molybdenum, tungsten and other heterogeneous powder mixtures), formed, as a rule, using special plasticizers and binders.

 The objective of the invention is to improve the quality of the products and expand the technological characteristics of the device due to the technical result: creating a uniform distribution of the extruding pressure on the surface of the molded compact at the time of its removal from the die cavity, which makes it possible to manufacture large-sized products from various powder raw materials, including high-modulus materials.

 Figure 1 shows the initial moment of pressing (to the left of the axis of the device) and the end of the molding process of the product (to the right of the axis); figure 2 - the initial moment of extrusion (to the left of the axis of the device) and the completion of the process of extruding the product from the matrix (to the right of the axis).

 A device for manufacturing products from powder materials contains (Fig. 1) a matrix 1 mounted on elastic elements 2, a fixed lower punch 3 and installed at the time of pressing on the matrix 1, the upper pressing punch 4, moved when a load is applied (pressing pressure) together with the matrix 1, since in comparison with the internal cavity of the matrix 1, the punch 4 has large transverse dimensions, and also additionally contains (Fig. 2) a press-out unit made in the form of an inverted cup 5 mounted on a mat 1 when pressing out so that the annular protrusion 6 of the housing 5 mates with the annular recess 7 of the matrix 1. Inside the cup-shaped housing 5 there is a press-out punch 8 interconnected through the elastic elements 9 with the bottom of the housing 5.

 The operation of the device is as follows. A predetermined amount of powder material 10 (volumetric or weight dosage) is poured into the cavity of the matrix 1 (Fig. 1), the upper pressing movable punch 4 is mounted on the matrix 1 and under the influence of the pressing pressure causing the punch 4 to move along with the matrix 1 in the direction of powder compaction 10 form the product 11 of the required geometric dimensions. After removing the load, the punch 4 from the matrix 1 is removed and a press-out unit is installed in its place, combining the annular protrusion 6 of the housing 5 and the recess 7 on the matrix 1 (Fig. 2). Pressure is applied to the cup-shaped housing 5 of the pressing unit, which, together with the matrix 1 and the product 11, moves in the pressing direction until the product 11 contacts the stationary lower punch 3. When the body 5 and the matrix 1 continue to move, remaining stationary, the product 11 starts to exit the matrix cavity 1. As the product exits the matrix, uniform pressure is applied to its entire surface, transmitted by the elastic elements 9 through the internal press-out punch 8. After the product 11 exits the matrix 1, the system is unloaded, the extruder unit and the product 11 are removed, the pressing cycle - extrusion is repeated.

Claims (1)

 DEVICE FOR PRODUCTION OF PRODUCTS FROM POWDER MATERIALS, containing a matrix mounted on elastic elements, a pressing punch mounted on the matrix, and a lower punch, characterized in that it is equipped with a unit for pressing the product by pulling the matrix installed between the pressing punch and the matrix and made in the form of an inverted glass with an inner punch connected to the bottom of the glass by means of elastic elements.

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