Preparation method of high-precision small-diameter thin-wall nickel-titanium alloy pipe

A nickel-titanium alloy, high-precision technology, used in metal rolling, metal rolling, metal processing equipment and other directions, can solve the problems of low cost, high yield, poor cold working plasticity of nickel-titanium alloy, etc. The effect of small deformation and improved drawing productivity

Pending Publication Date: 2022-08-05
西安诺博尔稀贵金属材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method solves the problem of poor cold-working plasticity of nickel-titanium alloy, and the obtained pipe has better surface quality and dimensional accuracy, high yield and low cost, and is suitable for mass industrial production

Method used

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  • Preparation method of high-precision small-diameter thin-wall nickel-titanium alloy pipe
  • Preparation method of high-precision small-diameter thin-wall nickel-titanium alloy pipe
  • Preparation method of high-precision small-diameter thin-wall nickel-titanium alloy pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Step 1, tube blank preparation: the nickel-titanium alloy bar is peeled and then drilled to prepare a nickel-titanium alloy tube blank with an outer diameter of 30 mm and a wall thickness of 5 mm, and the inner and outer surfaces of the tube blank are smooth without visible defects; the nickel-titanium alloy bar is be hot extruded or hot forged bars;

[0035] Step 2. Lubricate the surface of the tube blank: first, open the hydrogen flame heating gun, and use compressed hydrogen as fuel to heat the surface of the nickel-titanium alloy tube blank described in step 1 to 700 ° C to remove excess grease on the surface, and then place it in the atmosphere to naturally Cooling; when the surface temperature of the tube blank reaches 300°C, apply graphite emulsion lubricant evenly on its inner and outer surfaces, and then place it in the atmosphere to air dry for use;

[0036] Step 3: Warm rolling of the tube blank: The material of the warm rolled mandrel and the roll is M42 hig...

Embodiment 2

[0046] Step 1: Preparation of the tube blank: The nickel-titanium alloy bar is peeled and then drilled to prepare a nickel-titanium alloy tube blank with an outer diameter of 18 mm and a wall thickness of 2 mm. The inner and outer surfaces of the tube blank are smooth without visible defects; the nickel-titanium alloy bar is be hot extruded or hot forged bars;

[0047] Step 2. Lubricate the surface of the tube blank: First, turn on the hydrogen flame heating gun, and use compressed hydrogen as fuel to heat the surface of the nickel-titanium alloy tube blank described in step 1 to 800 ° C to remove excess grease on the surface, and then place it in the atmosphere. Cool naturally. When the surface temperature of the tube blank reaches 400°C, apply graphite emulsion lubricant evenly on its inner and outer surfaces, and then place it in the atmosphere to air dry for use;

[0048] Step 3: Warm rolling of the tube blank: The material of the rolled mandrel and the roll is W18Cr4V tu...

Embodiment 3

[0058] Step 1, tube blank preparation: the nickel-titanium alloy bar is peeled and then drilled to prepare a nickel-titanium alloy tube blank with an outer diameter of 15 mm and a wall thickness of 1.5 mm, and the inner and outer surfaces of the tube blank are smooth without visible defects; the nickel-titanium alloy rod The material is hot extruded bar or hot forged bar;

[0059] Step 2. Lubricate the surface of the tube blank: first, open the hydrogen flame heating gun, and use compressed hydrogen as fuel to heat the surface of the nickel-titanium alloy tube blank described in step 1 to 750 ° C to remove excess grease on the surface, and then place it in the atmosphere to naturally cool down. When the surface temperature of the tube blank reaches 350°C, apply graphite emulsion lubricant evenly on the inner and outer surfaces of the tube blank, and then place it in the atmosphere to air dry for use;

[0060] Step 3: Warm rolling of the tube blank: the material of the warm ro...

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Abstract

The invention discloses a preparation method of a high-precision small-diameter thin-wall nickel-titanium alloy pipe. The preparation method comprises the following steps: 1, preparing a pipe blank; 2, warm-rolling the pipe blank to obtain a semi-finished pipe; and 3, performing cold drawing on the pipe to obtain the finished pipe. The semi-finished pipe is obtained through warm rolling, the problem that nickel-titanium alloy is difficult to deform can be fundamentally solved in the warm rolling process, the plastic processing performance of the material is improved, the rolled pipe is good in surface quality and free of cracking defects, the number of intermediate annealing times in the rolling process can be remarkably reduced compared with a cold machining method, the production efficiency can be improved, and the production cost is reduced. The production cost is reduced; the problem that nickel-titanium alloy is poor in cold machining plasticity is solved, the obtained pipe is good in surface quality and size precision, the yield is high, cost is low, and the method is suitable for large-scale industrial production.

Description

technical field [0001] The invention belongs to the technical field of metal material processing, and in particular relates to a preparation method of a high-precision small-diameter thin-walled nickel-titanium alloy pipe. Background technique [0002] Nickel-titanium alloy is one of the most widely used shape memory alloys developed in recent decades. Compared with traditional medical metal materials (such as stainless steel and titanium alloys), nickel-titanium alloys are widely used in oral, It has been widely used in the fields of orthopedics, cardiovascular and cerebrovascular, hepatobiliary and extrathoracic. [0003] High-precision thin-walled nickel-titanium alloy pipes with diameters of 2mm to 3mm (tolerance ±0.02mm) and wall thickness of 0.2mm to 0.3mm (tolerance of ±0.02mm) have high strength and radial support, and special shape recovery. It has a wide range of applications in minimally invasive surgical instruments, especially interventional endoluminal stents...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): B21B17/02B21B45/02B21C1/24C21D9/08C22F1/02C22F1/10C22F1/18
CPCB21B17/02B21B45/0242B21C1/24C21D9/08C22F1/02C22F1/10C22F1/183Y02P10/25
Inventor朱绍珍谯小瑜胡彦敏薛晶晶纪光
Owner西安诺博尔稀贵金属材料股份有限公司