RU1810201C - Method of isothermic forming of parts - Google Patents

Abstract

SUMMARY OF THE INVENTION: A method of isothermal stamping involves placing an enamel-coated preform in a stamp, deforming it, and then removing it using an ejector. The product is removed together with the shape-forming part of the ejector adjacent to it, followed by their separation after cooling due to the difference in the coefficients of thermal expansion. It is recommended to install the removable part of the ejector in the subsequent stamping cycles following the first stamping, which is heated to a temperature below the matrix temperature by an amount that provides sufficient clearance during assembly. It is recommended that an antifriction agent, e.g. boron nitride, be applied between the interfaces of the parts of the ejector. 3 s.p. f-ly, 1 ill.

Description

The invention relates to the field of metal forming, namely to isothermal stamping and can be used in the manufacture of thin-walled blanks developed in plan having a complex-shaped external bottom.

The aim of the invention is to improve product quality and process productivity in the manufacture of thin-walled products having an outer bottom with a complex profile.

The drawing shows a sketch of a stamping block that implements the proposed method.

The block consists of a matrix 1 and an ejector consisting of two parts, a removable insert 2 and the ejector 3 itself, the position 4 indicates a stamped part.

Example. The billet of the VT20 titanium alloy bearing housing is covered with EVT-24 glass enamel and heated in an electric furnace to a temperature of 960 ° C. The heated billet is placed in a stamp of an isothermal installation with a temperature of 960 ° C and deformation is carried out. The stamped preform is removed from the matrix using a composite ejector, the forming part of which is removable (see Fig.). The part, together with the removable part of the ejector (removable insert), is removed from the stamp using pliers or a manipulator. After cooling, the liner is easily separated from the part. Boron nitride is deposited on its surface in contact with (adjacent to) the surfaces of the stationary part of the ejector, it is heated to a temperature of about 900 ° C and placed in a matrix for a subsequent stamping cycle. Temperature equalization00

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The liner and matrix tours take place when the workpiece is inserted into the stamp and the initial stage of the stamping process. Several interchangeable inserts allow for almost continuous operation of the stamping unit. The proposed method allows to increase productivity by more than three times.

Claims (4)

SUMMARY OF THE INVENTION 1. A method for isothermally stamping articles having a profile external bottom surface, comprising laying a heated and enamelled preform in a matrix, deforming it, and then removing the article by means of an ejector having a forming part, characterized in that, in order to increase the productivity of the process and the quality received products, removal the products are manufactured together with the mold-forming part of the ejector, which is subsequently separated by cooling due to thermal compression. 2. The method according to claim 1, with the exception that the forming part of the ejector is pre-installed heated to a temperature below the temperature of the matrix, determined at the time of installation the smallest clearance on the lateral landing surface during assembly. 3. The method according to claim 1, characterized in that a high temperature antifriction substance is applied between the interfaces of the parts of the ejector. 4. The method according to claims 1 and 3, with the exception of the fact that boron nitride is used as a high-temperature antifriction substance.