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Continuous hot-drawing forming method for nickel-titanium alloy pipe

A hot-drawing and nickel-titanium alloy technology, applied in the field of continuous hot-drawing and forming of nickel-titanium alloy pipes, can solve the problems of ineffective control of dimensional tolerances, poor import channels, low process efficiency, etc., to avoid surface scratches , The effect of fast heating and good surface quality

Active Publication Date: 2013-11-20
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, only nickel-titanium alloy pipes with large sizes can be produced in China, and the dimensional tolerance cannot be effectively controlled, and the use is limited. The market for nickel-titanium alloy capillary tubes is basically blank, mainly relying on imports, but the import channels are not smooth and the cost is high.
In China, the processing method of nickel-titanium alloy pipe mainly adopts multi-pass cold rolling and intermediate vacuum annealing, which has low process efficiency, high cost and low yield

Method used

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  • Continuous hot-drawing forming method for nickel-titanium alloy pipe
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Examples

Experimental program
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Effect test

Embodiment 1

[0034] Such as figure 1 and figure 2 As shown, the continuous hot drawing device used in this embodiment includes a quartz tube 1, a graphite tube 3 arranged in the quartz tube 1, and an induction coil 2 wound outside the quartz tube 1, and is used to supply power to the induction coil 2 High-frequency induction heating power supply 8; the quartz tube 1 includes an inlet pipe 1-1, an equal-diameter section 1-3 connected to the inlet pipe 1-1 through a divergent section 1-2, and a tapered section 1-4 The outlet pipe 1-5 connected with the equal-diameter section 1-3; the left end of the graphite pipe 3 is attached to the inner wall of the right end of the inlet pipe 1-1, and the right end of the graphite pipe 3 is attached to the inner wall of the left end of the outlet pipe 1-5 Form a cavity 4 between the gradual expansion section 1-2 of the graphite tube 3 and the quartz tube 1, the equal diameter section 1-3 and the tapered section 1-4; the graphite tube 3 is provided with ...

Embodiment 2

[0043] The continuous hot drawing device used in this embodiment is the same as that in Embodiment 1.

[0044] The continuous hot drawing forming method of the present embodiment is:

[0045] Step 1. Insert a Φ6.5mm 316L stainless steel mandrel into a Ni-44Ti alloy tube blank with an outer diameter of 10mm and an inner diameter of 7mm to obtain an assembly 11; 500 mm of the tube blank is exposed; the roughness of the inner surface of the Ni-44Ti alloy tube blank is Ra<3.2, and the roughness of the outer surface of the mandrel is Ra<3.2; the surface of the mandrel is electroplated with a copper lubricating coating with a thickness of 10 μm;

[0046] Step 2. Insert the mandrel head of the assembly 11 from the inlet pipe 1-1, pass through the graphite tube 3 and exit from the outlet pipe 1-5, then pass through the drawing die of the drawing machine 12 and clamp On the fixture of the drawing machine 12, the mandrel afterbody of the assembly 11 is supported on the discharge rack 1...

Embodiment 3

[0050] The continuous hot drawing device used in this embodiment is the same as that in Embodiment 1.

[0051] The continuous hot drawing forming method of the present embodiment is:

[0052] Step 1. Insert a Φ6.5mm 316L stainless steel mandrel into a Ni-50.8Ti alloy tube blank with an outer diameter of 10mm and an inner diameter of 7mm to obtain an assembly 11; The tail is exposed to the tube blank by 200 mm; the roughness of the inner surface of the Ni-50.8Ti alloy tube blank is Ra<3.2, and the roughness of the outer surface of the mandrel is Ra<3.2; the surface of the mandrel is electroplated with a copper lubricating coating with a thickness of 2 μm ;

[0053] Step 2. Insert the mandrel head of the assembly 11 from the inlet pipe 1-1, pass through the graphite tube 3 and exit from the outlet pipe 1-5, then pass through the drawing die of the drawing machine 12 and clamp On the fixture of the drawing machine 12, the mandrel afterbody of the assembly 11 is supported on the...

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Abstract

The invention discloses a continuous hot-drawing forming method for a nickel-titanium alloy pipe. The continuous hot-drawing forming method comprises the following steps: 1, inserting a core rod into a nickel-titanium alloy pipe blank to obtain a combined body; 2, drawing the combined body by adopting a continuous hot-drawing forming device; 3, repeating the step 2; 4, heating the drawn combined body, then plastically stretching the core rod in the combined body to reduce the diameter of the core rod, and finally taking out the diameter-reduced core rod to obtain the nickel-titanium alloy pipe. According to the method, due to induction heating, the heating speed is high; continuous hot-drawing can be realized by continuous heating, so that the production efficiency is improved; furthermore, a work hardening state on the surface of the pipe can be effectively reduced in a heat treatment stage by virtue of a skin effect of current; the subsequent plastic processing of materials is facilitated. A graphite pipe is adopted as the continuous hot-drawing forming device used in the method, and can preserve the heat of the materials and realize a lubricating function; therefore, the phenomenon that the surface of the pipe is scratched during the axial stretching motion in a furnace pipe can be effectively avoided.

Description

technical field [0001] The invention belongs to the technical field of nickel-titanium alloy pipe material processing, and in particular relates to a continuous hot drawing method for nickel-titanium alloy pipe material. Background technique [0002] Nickel-titanium alloy capillaries are widely used in aerospace, medical and civil industries. Nitinol tubing is a difficult profile to machine. In 1963, the U.S. Naval Ordnance Research Office discovered the shape memory effect and superelastic properties of nickel-titanium alloys. Since then, the plastic forming of nickel-titanium alloys has been a hot and difficult point in the field of plastic processing in various countries, especially the processing technology of conventional pipes and special pipes of nickel-titanium alloys. Nickel-titanium alloy pipes are used in the connection, fastening and driving elements of aerospace liquid pipe joints, biomedical catheters and vascular stents, satellite space truss connection slee...

Claims

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Application Information

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IPC IPC(8): B21C1/24B21C9/00B21C9/02
Inventor 马光张科郑晶贾志华王轶操齐高
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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