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Lubrication method of Ti-Ni based memory alloy during hot extrusion

A technology of memory alloy and hot extrusion, which is applied in the lubrication of Ti-Ni-based memory alloy hot extrusion processing, and in the field of Ti-Ni-based memory alloy hot extrusion lubrication, which can solve the problem of mold gnawing, stuffy car, and large deformation resistance etc. to achieve the effects of reducing diffusion pollution, improving lubrication conditions, and reducing diffusion speed

Inactive Publication Date: 2017-06-23
GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ti-Ni-based memory alloys have high deformation resistance in the thermal processing range, and the traditional titanium alloy extrusion lubrication process (such as glass lubrication, metal sheath method (copper, iron, etc.)) cannot effectively solve the lubrication problem in the extrusion process. Ti - During the extrusion process of Ni-based memory alloys, problems such as surface cracks, mold gnawing, and stuffy cars will occur due to poor lubrication conditions. See Figure 1-a to Figure 1-c

Method used

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  • Lubrication method of Ti-Ni based memory alloy during hot extrusion
  • Lubrication method of Ti-Ni based memory alloy during hot extrusion
  • Lubrication method of Ti-Ni based memory alloy during hot extrusion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Realization of Ti on an 850 ton extrusion press with a barrel diameter of 95mm 44 Ni 47 Nb 9 Memory alloy 20mm rod hot extrusion process.

[0026] The specific steps are:

[0027] Step 1: Machining the Extruded Billet

[0028] Ti in diameter 100mm 44 Ni 47 Nb 9 A 200mm long extrusion billet is cut from the memory alloy ingot billet. Machining peeling, flat end processing extrusion billet; since the extruded billet needs to reserve the thickness of the nickel layer for later spraying, the outer diameter of the extruded billet processed this time is 90mm.

[0029] Step 2: Sandblasting

[0030] Sand blasting is used to remove oil stains on the surface of the machined blank and make the blank form a rough surface.

[0031] Step 3: Thermal Spray Nickel Layer

[0032] Ti by thermal spraying 44 Ni 47 Nb 9 A 1mm-thick nickel sprayed layer is formed on the surface of the shape memory alloy extrusion billet.

[0033] Step 4: Extrude

[0034] Select a suitable die, ...

Embodiment 2

[0040] Realization of TiNi on an 850 ton extrusion press with a barrel diameter of 95mm 50.8 Extrusion of memory alloy pipes with an outer diameter of 44mm and an inner diameter of 24mm.

[0041] Step 1: Machining the Extruded Billet

[0042] TiNi in diameter 100mm 50.8 A 200mm long extrusion billet is cut from the memory alloy ingot billet. Machining peeling, flat end processing extrusion billet; since the extruded billet needs to reserve the thickness of the later sprayed nickel layer, the outer diameter of the extruded billet processed this time is 92mm, and the prefabricated inner hole is 24mm.

[0043] Step 2: Sandblasting

[0044] Sand blasting is used to remove oil stains on the surface of the machined blank and make the blank form a rough surface.

[0045] Step 3: Thermal Spray Nickel Layer

[0046] TiNi by thermal spraying 50.8 A 0.5 mm thick nickel sprayed layer is formed on the surface of the memory alloy extrusion billet.

[0047] Step 4: Extrude

[0048] Sel...

Embodiment 3

[0055] Realization of Ti on a 500 ton extrusion press with a barrel diameter of 95mm 50 Ni 47 Fe 3 Extrusion processing of shape memory alloy outer diameter T profile.

[0056] Step 1: Machining the Extruded Billet

[0057] Ti in diameter 100mm 50 Ni 47 Fe 3 A 200mm long extrusion billet is cut from the memory alloy ingot billet. Machining peeling, flat end processing extrusion billet; because the extrusion billet needs to reserve the thickness of the later sprayed nickel layer, the outer diameter of the extrusion billet processed this time is 91mm.

[0058] Step 2: Sandblasting

[0059] Sand blasting is used to remove oil stains on the surface of the machined blank and make the blank form a rough surface.

[0060] Step 3: Thermal Spray Nickel Layer

[0061] Ti by thermal spraying 50 Ni 47 Fe 3 A layer of 0.75 mm thick nickel sprayed layer is formed on the surface of the shape memory alloy extrusion billet.

[0062] Step 4: Back Extrude

[0063] Select a suitable...

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Abstract

The invention relates to lubrication method of Ti-Ni based memory alloy during hot extrusion, and belongs to the field of Ti-Ni based memory alloy processing. A thermal spraying mode is used for forming a nickel metal layer on the surface of a Ti-Ni based memory alloy extrusion billet, and the nickel metal layer is used as a metal lubricating layer in the extruding process in order to realize extruding and lubrication effects. Firstly, scaling and port flatting and other machining of a Ti-Ni based memory alloy workpiece are carried out in order to obtain extrusion billets; surface sand-blast treating is carried out for the extrusion billets; thermal spraying is carried out for the surface of the extrusion billets, and the Ti-Ni based memory alloy extrusion billets whose surfaces are covered by nickel metal layers are obtained. The nickel metal layer is used as the metal lubricating layer in the process of extruding, in order to realize the effects of extruding and lubrication. The lubrication mode can be used for realizing lubrication requirements of Ti-Ni based memory alloy forward / backward extruded tube, rod and other materials, and Ti-Ni based memory alloy extrusion materials with qualified quality are processed.

Description

technical field [0001] The invention relates to a hot extrusion lubrication method for a Ti-Ni-based memory alloy, in particular to a lubrication method during hot-extrusion processing of a Ti-Ni-based memory alloy, and belongs to the field of Ti-Ni-based memory alloy processing. Background technique [0002] Shape memory alloys are smart metals represented by equiatomic ratio TiNi alloys, which have unique shape memory properties. The shape memory effect is a special property that the alloy returns to its original shape when it is heated above a certain critical temperature after being deformed at a low temperature. A variety of driving and actuator components have been prepared in engineering using the characteristic of shape memory alloy materials, which have been widely used in machinery and automation industries. Among them, the shape memory alloy pipe joint is a typical representative. Its principle is to expand the diameter of a pipe joint of a certain size at low te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C23/32
CPCB21C23/32
Inventor 尹向前米绪军李艳锋高宝东惠松骁刘睿解浩峰彭丽军冯雪
Owner GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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