RU2688492C2 - Method of layer-by-layer pressing parts from lithium hydrogen-containing materials of various density - Google Patents

Abstract

FIELD: manufacturing technology.SUBSTANCE: invention relates to methods for layer-by-layer cold pressing of multilayer part from lithium hydrogen-containing powder materials in steel mold. Method includes preparation of batches, preparation of mold by its assembly from forming elements with application of lubricant, filling material into mold die and pressing first layer into size to preset average density, installation of obtained part layer in form of forming matrix for next layer, filling material of second layer and pressing of second layer in size to specified average density into first layer of part, pressing the third layer into the second layer with subsequent pressing of the layers to obtain the required number of layers of the part. Each previous layer is used as shaping matrix for the next layer, and forming elements included in the set of the mold are used for each layer after their re-adjustment.EFFECT: obtaining structural parts without defects (cracks, sinks, delaminations), with provision of requirements for density, discontinuity in size without machining and gluing.1 cl, 1 tbl

Description

The invention relates to the production of multilayer parts (products) from powder materials, namely from lithium hydrogen-containing materials (LVSM) by cold pressing.

The main requirements to be met by the product are density, heterogeneity, the absence of cracks and internal defects, the compliance of the geometric parameters with the requirements of the design documentation (KD), the integrity of the design.

There are designs of parts (products), consisting of two or more parts glued together.

The disadvantage of these structures is the need to manufacture for each part of the blanks, their subsequent machining and gluing together.

The disadvantage of the technology of manufacturing parts with their subsequent gluing is the need for mechanical processing of the workpieces with the provision of the required clearance between the parts, for the location of the glue in it. Production of blanks dramatically reduces the utilization rate of expensive raw materials, significantly increases the complexity of manufacturing products.

The technical problem of the claimed solution is the development of the technology for manufacturing parts using the method of cold layer-by-layer pressing to the size of parts made from powder materials, in particular from LVSM, ensuring the requirements of the design documentation.

The solution to the problem is provided by using the present invention, namely the fact that all the parts included in the assembly are pressed in size, one into the other. It turns out the gapless connection, which achieves the required quality of the mechanical connection of parts.

Initially, the base layer of the part is pressed. It is monitored for compliance with the requirements of the design documentation: the appearance of the absence of cracks and chips, geometric parameters, density, different densities, internal defects. Then, the resulting layer is installed in the mold, the necessary amount of material is poured for the manufacture of the second layer of the part and it is pressed. After pressing, the part (product) is removed from the mold and its geometry and density are monitored.

A similar procedure is used in the manufacture of parts consisting of any number of successively pressed layers.

Below are examples illustrating the use of the invention. The data are tabulated.

The analysis of the indicators given in the table confirms that the laboriousness of manufacturing is significantly reduced by eliminating the process of fitting one layer to another, in order to ensure the gap between layers on the mating surfaces required by KD. It eliminates the fire hazardous process of machining parts and the need to equip the production site with an inert gas medium in the cutting zone. In the manufacture of parts there is no chips, and this is a 100% use of material, without loss. The decrease in the adhesion strength of the layers in the parts is within the limits of the permissible CD. The control imposed on the details (products) of the parameters was carried out similarly on the same equipment. This method allows, thus, to obtain finished multilayer parts, but not blanks, and the layers can be of different thickness, geometry, and of various materials.

Claims (1)

The method of layer-by-layer cold pressing of a multilayer part of lithium hydrogen-containing powder materials in a steel mold, including preparing weights, preparing the mold by assembling it from forming elements with applying lubricant, filling the material into the mold matrix and pressing the first layer in size to a given the average density, the installation of the obtained layer details in the form of a matrix for the subsequent layer, filling the material of the second layer and pressing the second layer in size to a predetermined medium density in the first layer of the part, pressing the third layer in the second layer, followed by pressing the layers to obtain the required number of layers of the part, each previous layer being used as a shaping matrix for the next layer, and the shaping elements included in the mold kit are used to each layer after their readjustment.