SU721136A1 - Method of manufacturing hollow press-articles - Google Patents

Description

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This invention relates to the field of metal forming.

There is a known method for manufacturing a press product by squeezing a hollow billet out of a container into an annular gap formed by a point of a matrix and a needle on which is mounted a buckle {i},

However, the technological lubricant applied to the needle has the ability to flow onto the forming surface of the matrix, which lowers the quality of the resulting press products, as this leads to if you get delaminations, thin layers, and when using combined matrices - to the absence of metal welding along the seam.

The purpose of the invention is to improve the quality of press products by eliminating the possibility of lubricant falling from the needle onto the forming surface of the die.

This is achieved by the fact that, when the preform is placed on a needle by the proposed method, its end face is mixed relative to the needle end in the direction of pressing with the second end of the workpiece supported by means of a press stamp. In this case, extrusion of the billet metal onto the end of the needle is provided before forming the press-edel, thereby preventing grease from falling from the needle onto the forming surface of the die.

FIG. 1 shows the moment of installation of the workpiece on the needle; in fig. 2 - the moment of extrusion of the billet metal onto the needle end before forming the press section; on fgp. 3 - the moment of forming a press product by pressing through a die.

The manufacture of hollow press articles is carried out as follows. The workpiece 1 is heated to a predetermined temperature and fed to the axis of the press. A lubricant is applied to the surface of the needle 2, and then the workpiece 1 is pushed onto the needle 2. Moreover, when the workpiece is installed, its end 3 is displaced relative to the end 4 of the needle 2 in the direction

Claims (1)

The claims, since the workpiece at this moment rests on the matrix 7, and the needle does not reach the point of the matrix, then a part of the metal 8 of the workpiece is extruded onto the end face 4 of the needle 2 even before the start of the shaping of the press article. Thus, the release of lubricant from the surface of the needle 2 to the matrix 7 is blocked by metal extruded onto the end 4 of the needle 2. Example. Tube is pressed from alloy D16 having hollow stiffeners. Workpiece size 0 414 * 0 310 * 20 X900 mm is heated to 440 ° C and put on a pre-lubricated needle so that the end face of the workpiece is offset relative to the end of the needle by about 100 mm ²⁵ As a result of pressing, a pipe with a size of 0 300 * 0 312x6000 mm with hollow stiffeners is obtained. Order 34/6 Draw 986 14. OM ιίι · ιη · ιιιιι "ιΐί" ιι_ι.ΓнтIIГ'-i · III riinix · ιιιιιι · <ι · Γΐπ · ο TsNIIIPI A method of manufacturing hollow molds by extruding a press stamp 10 hollow eagotraining from a container into an annular gap formed by a matrix point and a needle on which a workpiece is mounted, characterized in that, in order to improve the quality of 15 molds by eliminating the possibility ingress of grease from the needle onto the forming surface of the matrix, when installing the workpiece on the needle, its end face is displaced relative to the end of the needle in the pressing direction with the second end of the workpiece being supported by a press stamp.