Equal-channel angular extrusion die adopting bottom sliding block

Abstract

The invention relates to an equal-channel angular extrusion die adopting a bottom sliding block. The die comprises an upper die plate, a side pressing plate, a male die, a punch, a die core, a die sleeve, a lower die plate, the sliding block, a thrust motor, a heating rod, an electromagnet, a speed sensor, lines and a damping strip, wherein a through hole is formed in the center of the male die, a boss is arranged on the inner side of the through hole, an upper die body is sequentially provided with the upper die plate, the side pressing plate, the male die and the punch from top to bottom, and a guide column is arranged on the bottom face of the side pressing plate; and a lower die body is composed of the die core, the die sleeve, the lower die plate and the sliding block, the die core comprises a left die core body and a right die core body, and continuous channels are formed in the upper side, the lower side and the right side of the left die core body. According to the die, the continuous channels are formed in the upper side, the lower side and the inner side surface of the die core, so that the corner channels can be conveniently replaced when being damaged, the thrust motor pushes the sliding block of the lower die plate and the lines on the surface of the sliding block to slide reversely to reduce the bottom speed during corner rotation of an extrusion part, and the heating rod in the die core can improve the metal fluidity of a workpiece so as to increase the top speed of the workpiece.

Description

technical field [0001] The invention relates to the technical field of metal material pressure processing, in particular to an equal-channel angular extrusion die using a bottom slide block. Background technique [0002] In recent years, with the development of the field of metal materials, in order to obtain better mechanical properties of metals, ultra-fine-grained materials can be prepared through large-scale shear deformation, which has physical properties different from traditional materials and Mechanical properties of high strength and high plasticity and high strain rate processing superplasticity at lower temperatures. [0003] Equal-channel angular extrusion is an effective technique for preparing ultra-fine-grained materials. It is generally believed that the effect of shearing and refining grains is best when channel extrusion with a rotation angle of 90° is used, while the currently used 90° Equal-channel angular extrusion dies will produce warping and uneven m...

AI Technical Summary

Problems solved by technology

[0003] Equal-channel angular extrusion is an effective technique for preparing ultra-fine-grained materials. It is generally believed that the effect of shearing and refining grains is best when channel extrusion with a rotation angle of 90° is used, while the currently used 90° Equal-channel angular extrusion dies will produce warping and uneven material heads after extrusion, which is related to the speed difference between the upper and lower ends of the workpiece when it is cornered. At the same time, the bottom of the channel will produce a large stress, prone to channel damage

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