High-strength and high-elasticity shape memory alloy chuck for high-carbon steel wire drawing

Abstract

The invention relates to the technical field of high-carbon steel wire machining, and particularly discloses a high-strength and high-elasticity shape memory alloy chuck for high-carbon steel wire drawing. The high-strength and high-elasticity shape memory alloy chuck comprises two chuck main bodies, NiTi shape memory alloy plates are connected to the opposite surfaces of the two chuck main bodies through mounting plates, iron permeating layers are arranged on the opposite surfaces of the two NiTi shape memory alloy plates, and limiting mechanisms are arranged on the opposite surfaces of the two mounting plates. The mechanical characteristic that NiTi shape memory alloy stress induces martensite inverse phase transformation is applied, flexible loading is conducted on the clamped high-carbon steel wire, a stress platform is generated in the loading process, that is, the stress does not change along with the increase of deformation, and therefore it is guaranteed that the high-carbon steel wire does not generate stress concentration at the chuck position, the steel wire is prevented from being broken, the drawing efficiency of the high-carbon steel wire is improved, the iron permeating layer is attached to the surface of the NiTi shape memory alloy plate through a double glow plasma alloying technology, and the surface hardness of the NiTi shape memory alloy plate is improved.

Description

technical field [0001] The invention relates to the technical field of high-carbon steel wire processing, in particular to a high-strength and high-elastic shape memory alloy chuck for drawing high-carbon steel wire. Background technique [0002] After proper heat treatment or cold drawing hardening, high carbon steel wire has high strength and hardness, high elastic limit and fatigue limit (especially notch fatigue limit), and the cutting performance is acceptable, but the welding performance and cold plastic deformation ability are poor; Due to the high carbon content, cracks are prone to occur during water quenching, so double-liquid quenching (water quenching + oil cooling) is often used, and oil quenching is often used for small cross-section parts; this type of steel is generally tempered or normalized or tempered at medium temperature after quenching. Used in the surface quenched state; mainly used in the manufacture of springs and wear-resistant parts. [0003] The ...

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Problems solved by technology

[0003] The production of high-carbon steel wire requires drawing processing of the wire rod, and the drawing process requires 8 to 12 passes of drawing dies. The drawing stress required in this process is relatively large, especially when the diameter of the steel wire is less than 2mm. Stress concentration is easy to occur at the chuck position, and due to the large drawing stress, the steel wire often breaks, which greatly reduces the efficiency of steel wire drawing

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