Lubrication impact extrusion forming method of nickel titanium-base shape memory alloy tubing glass

A memory alloy and glass lubrication technology, which is applied in the field of nickel-titanium-based shape memory alloy pipe glass lubricated impact sleeve extrusion and pipe forming, can solve the problems of high production cost, high vacuum annealing cost, long equipment time, etc. The effect of low cost, low cost and less equipment occupied

Inactive Publication Date: 2005-11-30
JIANGSU FASTEN TECH DEV CENT
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AI Technical Summary

Problems solved by technology

Because each deformation of cold rolling is very small, there are many cold rolling passes; the cost of vacuum annealing is high and the...

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0015] 1. Test conditions:

[0016] Test material composition: the tube blank is made of Ni 50.8 Ti 49.2 , the metal mandrel is made of Ni 492 Ti 50.8 ; Vacuum induction furnace smelting, 850□ forging blank into 50mm round bar. The equipment adopts a 1000-ton high-energy screw press. Design special bar pressing die. The heating furnaces are 13KW and 75KW resistance furnaces respectively.

[0017] 2. Stamping sleeve extrusion molding process

[0018] Step 1. Forging or rolling nickel-titanium-based shape memory alloy rods, and machining a blind-hole tube blank along the axis, machining a cone with the same shape as the die head at the closed end of the tube blank, and machining the nickel-titanium-based shape Memory alloy mandrel, so that the ratio of the outer diameter of the tube blank to the diameter of the mandrel is 1.4-2.

[0019] Step 2. First heat the tube blank, mandrel, extrusion pad and mold to 200±10□, spray lubricant on the outer surface of the tube blank,...

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Abstract

This invention relates to impact cover extrusion forming method with nickel-tantalum based shape memory alloy pipe glass lubrication with the technical steps: 1) forge or roll to nickel-tantalum based shape memory alloy bar, process blind core bar and hole pipe billet with block end of cone; 2) heat pipe billet, core bar, extrusion pad and mould to 200Degí‚10Deg, spray lubricant agent separately, insert the core bar into pipe billet to make the integer with back end of extrusion pad, heat integrally to 830Deg~880Deg; 3) heat mould to 400Deg~550Deg; 4) put the integer and its extrusion pad into mould to impact and break; 5) move away the extrusion pad, cut the back integer end to present core bar, and heat integer to 800Deg~850Deg; 6) draw the core bar plastically to reduce its diameter and take out from pipe billet. This invention saves labor and time, and has low cost.

Description

Technical field: [0001] The invention relates to a pipe forming method, in particular to a glass lubrication impact sleeve extrusion forming method of a nickel-titanium-based shape memory alloy pipe. The invention belongs to the technical field of pipe metal plastic processing and forming. Background technique: [0002] Nickel-titanium-based shape memory alloy pipes are widely used in fasteners, connectors and medical fields. Nickel-titanium-based shape memory alloy seamless pipe is a difficult-to-machine profile. For decades, the plastic forming of nickel-titanium-based shape memory alloy pipes has been one of the difficulties and hot spots in the field of plastic processing engineering at home and abroad. Its products have important applications in hydraulic pipe joints, various types of catheters in the medical field, vascular stents, miniature reconnaissance aircraft, insect robots and other miniature weapons and equipment as connectors and load-sharing connections. B...

Claims

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Application Information

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IPC IPC(8): B21C23/18
Inventor 陈威刘礼华张伟红谭佃龙李运良张士宏孙文蔡伟王利明
Owner JIANGSU FASTEN TECH DEV CENT
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