Continuous equal channel angular extrusion combination mould and extrusion method

Abstract

The invention provides a continuous equal channel angular extrusion combination mould and an extrusion method. The combination die comprises a cavity (6) with a stock stopping block and a feeding opening, a mould (8) with a sizing strip hole, an inner mould cushion (7), an outer mould cushion (9) and a fastening device (10), wherein the inner mould cushion is located on the inner side of the mould; the outer mould cushion is located on the outer side of the mould; the fastening device is mounted outside the outer mould cushion; the inner mould cushion, the outer mould cushion and the fastening device are provided with inner holes; the feeding opening, the sizing strip hole and the inner holes of the inner mould cushion, the outer mould cushion and the fastening device are concentric; the inner hole of the inner mould cushion is a cone hole; the small-bore end of the cone hole is opposite to the sizing strip hole of the mould; the stock stopping block has a gradient; an angle alpha of the gradient is 0-45 degrees. The continuous equal channel angular extrusion combination mould is simple and practicable, low in cost and easy to maintain, is suitable for various metals, alloys and high polymers and is beneficial to the implementation of equal channel angular extrusion under a condition with different extrusion corners and different back pressures.

Description

technical field [0001] The invention relates to an extrusion die, in particular to a continuous equal-diameter angular extrusion die. The invention also relates to a continuous equal-diameter angular extrusion deformation method. Background technique [0002] Ultrafine-grained materials have excellent mechanical and physical properties due to their unique microstructure, making them one of the hotspots in the field of materials research. Compared with other methods of preparing bulk ultrafine-grained materials, such as evaporation condensation-in-situ cold pressing method, high-energy ball milling method and amorphous crystallization method, equal channel angular pressing (ECAP) not only eliminates The large number of pores and impurities in grinding in the cold-pressed ultrafine-grained samples can be eliminated, and three-dimensional large-sized dense block nanomaterials can be prepared. [0003] Equal angular extrusion based on continuous extrusion technology not only h...

AI Technical Summary

Problems solved by technology

However, the material stopper and the mold are integrated with high cost and complicated process, and neither of them involves the specific realization of the extrusion corner.

In addition, the preparation method given in US patent document US7152448 and Chinese patent document 200910183586.9 cannot provide back pressure, and the technical solution in Chinese patent document 02130881.0 is unfavorable for multi-pass extrusion

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