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

Method used

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

Examples

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Example Embodiment

[0033] Example 1

[0034] Such as figure 1 with figure 2 As shown, the continuous hot drawing forming 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 used for supplying power to the induction coil 2. The 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 diverging 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 The graphite tube 3 and the divergent section 1-2, the equal diameter section 1-3 and the tapered section 1-4 of the quartz tube 1 form a cavity 4; the graphite tube 3 is...

Example Embodiment

[0042] Example 2

[0043] The continuous hot drawing forming device used in this embodiment is the same as that of the first embodiment.

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

[0045] Step 1. Insert a 316L stainless steel mandrel with Φ6.5mm into a Ni-44Ti alloy tube with an outer diameter of 10mm and an inner diameter of 7mm to obtain assembly 11; the head of the mandrel in the assembly exposes 300mm of the tube, and the tail of the mandrel The exposed tube blank is 500mm; 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 core rod is Ra<3.2; the surface of the core rod is electroplated with a copper lubricating coating with a thickness of 10 μm;

[0046] Step 2: Insert the core rod head of the assembly 11 from the inlet pipe 1-1, pass through the graphite pipe 3 and then pass through the outlet pipe 1-5, and then pass through the drawing die of the drawing machine 12 and clam...

Example Embodiment

[0049] Example 3

[0050] The continuous hot drawing forming device used in this embodiment is the same as that of the first embodiment.

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

[0052] Step 1. Insert a 316L stainless steel mandrel of Φ6.5mm into a Ni-50.8Ti alloy tube with an outer diameter of 10mm and an inner diameter of 7mm to obtain a combination 11; the head of the mandrel in the combination is exposed to the tube by 100mm, and the mandrel The tail part of the exposed tube blank is 200mm; the inner surface roughness of the Ni-50.8Ti alloy tube blank is Ra<3.2, and the outer surface roughness of the core rod is Ra<3.2; the surface of the core rod is electroplated with a copper lubricating coating with a thickness of 2μm ;

[0053] Step 2: Insert the core rod head of the assembly 11 from the inlet pipe 1-1, pass through the graphite pipe 3 and then pass through the outlet pipe 1-5, and then pass through the drawing die of the drawing machine 12 a...

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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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