CN118595198A - Sharp burning method of shape memory alloy ultrafine filament - Google Patents
Sharp burning method of shape memory alloy ultrafine filament Download PDFInfo
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- CN118595198A CN118595198A CN202410233963.XA CN202410233963A CN118595198A CN 118595198 A CN118595198 A CN 118595198A CN 202410233963 A CN202410233963 A CN 202410233963A CN 118595198 A CN118595198 A CN 118595198A
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- 238000000034 method Methods 0.000 title claims abstract description 42
- 229910001285 shape-memory alloy Inorganic materials 0.000 title claims abstract description 19
- 238000010438 heat treatment Methods 0.000 claims abstract description 51
- 230000000149 penetrating effect Effects 0.000 claims abstract description 9
- HZEWFHLRYVTOIW-UHFFFAOYSA-N [Ti].[Ni] Chemical compound [Ti].[Ni] HZEWFHLRYVTOIW-UHFFFAOYSA-N 0.000 claims description 18
- 229910001000 nickel titanium Inorganic materials 0.000 claims description 18
- 238000010304 firing Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 5
- 230000035515 penetration Effects 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 13
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 6
- 238000000227 grinding Methods 0.000 description 6
- 230000007797 corrosion Effects 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 238000005485 electric heating Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 2
- 238000010622 cold drawing Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 239000011259 mixed solution Substances 0.000 description 2
- 229910017604 nitric acid Inorganic materials 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007334 memory performance Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
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Abstract
The invention discloses a tip burning method of shape memory alloy ultrafine filaments, which comprises the following steps: pre-tightening and stretching the two ends of the wire to be burned, and respectively fixing the two ends of the wire; a direct-current constant-voltage constant-power heating device is arranged below the wire, and generates heat to preheat the wire; the direct-current constant-voltage constant-power heating device continues to heat the wire, and stretches the wire between the two fixed ends until the wire breaks to obtain a die penetrating tip; the direct-current constant-voltage constant-current heating device has the voltage of 10V-15V, the current of 8A-12A and the power of 80W-180W; the tensile force of the stretching is F (N) =1500×pi×r 2 ×1/3, and the speed of the stretching is 0.2 mm/s-2 mm/s. The invention can improve the surface reduction rate of the once-burned tip of the wire, meet the requirement of continuous repeated die penetration, improve the drawing efficiency, and especially improve the drawing efficiency of the micron-sized filament.
Description
Technical Field
The invention relates to the technical field of nickel-titanium shape memory alloy preparation, in particular to a tip burning method of a shape memory alloy ultrafine filament.
Background
The nickel-titanium shape memory alloy has unique super elasticity, shape memory performance, high strength, low modulus and corrosion resistance, and is widely applied to engineering fields and medical fields such as aviation, aerospace, medical treatment, mechanical manufacturing, construction and the like.
In the preparation process of the nickel-titanium shape memory alloy ultrafine wire, the continuous multi-pass cold drawing process of the micron-sized wire is a key step in the industrial field. The cold drawing process comprises the following steps: firing, die-piercing, loading and drawing, wherein the firing technique is very important for optimizing the efficiency of the drawing process.
In the prior art, the tip burning technology comprises a chemical corrosion method, a grinding method, a tubular furnace hot stretching method and an electric heating method, wherein the chemical corrosion method needs strong acid hydrofluoric acid, has complex process and low surface reduction rate of the tip burning, basically needs the tip burning before penetrating through a die once, and cannot continuously penetrate through the die; the grinding method is simple in technology, but the head of the wire is often bent after being ground, so that the wire is not easy to pass through a die, the surface reduction rate of the grinding method is low, and the wire cannot pass through the die continuously; the tube furnace hot drawing process wastes longer filaments; the existing electric heating method is generally alternating current heating, the wire loses a work hardening mechanism, the local temperature is increased, the fusing process is accelerated, the radial length of the tip is shorter, and particularly when micron-sized filaments are formed, the diameter of the filaments is too small, and the length of the tip is too short to pass through a die.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a method for burning a shape memory alloy ultrafine filament, which improves the surface reduction rate of the wire material for one-time burning, can continuously pass through a die for multiple times, improves the drawing efficiency, and particularly improves the drawing efficiency of a micrometer-sized filament.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
A method for sharpening shape memory alloy ultrafine filaments, which comprises the following steps:
pre-tightening and stretching the two ends of the wire to be burned, and respectively fixing the two ends of the wire;
A direct-current constant-voltage constant-power heating device is arranged below the wire, and generates heat to preheat the wire;
The direct-current constant-voltage constant-power heating device continues to heat the wire, and stretches the wire between the two fixed ends until the wire breaks to obtain a die penetrating tip; the direct-current constant-voltage constant-current heating device has the voltage of 10V-15V, the current of 8A-12A and the power of 80W-180W; the tensile force of the stretching is
In the formula, r represents the radius of the wire material, and the unit is mm;
the stretching speed is 0.2 mm/s-2 mm/s.
The implementation of the embodiment of the invention has the following beneficial effects:
According to the embodiment of the invention, a low-voltage direct current heating method is adopted, so that local high temperature is avoided after the wire is quickly overheated, the wire is uniformly heated and softened, the reduction rate of the firing tip of each pass can be more than 25% by matching with proper stretching tension and stretching speed, the die can be continuously penetrated, and the drawing efficiency is improved.
The tip burning method can realize the reduction rate of more than 25% even for micron-sized wires, and improve the drawing efficiency of high-difficulty micron-sized wires.
The tip after tip burning by the tip burning method is straight and thin, so that auxiliary devices such as a magnifying glass and the like can be omitted, the die can be directly penetrated visually, the die penetrating difficulty is reduced, and the die penetrating efficiency is improved.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Wherein:
FIG. 1 is a schematic view of a tip burning apparatus according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention discloses a tip burning method of shape memory alloy ultrafine filaments, which comprises the following steps:
1) And pre-tightening and stretching the two ends of the wire to be burned, and respectively fixing the two ends of the wire.
2) The direct-current constant-voltage constant-power heating device is arranged below the wire, and generates heat to preheat the wire for 5-10 s.
In this step, the preheating is performed for 5s to 10s, based on the reddening of the surface of the wire.
3) The direct-current constant-voltage constant-power heating device continues to heat the wire, and simultaneously stretches the wire between the two fixed ends until the wire breaks to obtain a die penetrating tip; wherein, the voltage of the direct current constant voltage and constant current heating device is 10V-15V, the current is 8A-12A, and the power is 80W-180W; the tensile force of the stretching is
In the formula, r represents the radius of the wire material, and the unit is mm; the stretching speed is 0.2 mm/s-2 mm/s.
In the step, the wire is heated and stretched simultaneously, and the invention adopts a low-voltage direct current heating method, so that the wire is prevented from generating local high temperature after being quickly overheated, the wire is uniformly heated and softened, and the reduction rate of the firing tip of each pass is more than 25 percent by matching with proper stretching tension and stretching speed, so that the die can be continuously penetrated, and the drawing efficiency is improved. In the prior art, the reduction rate of the continuous die is usually 10%, so that the reduction rate of the continuous die is more than 25%, at least 3 continuous dies can be continuously penetrated, and the drawing efficiency can be remarkably improved.
The tip burning method can realize the reduction rate of more than 25% even for micron-sized wires, and improve the drawing efficiency of high-difficulty micron-sized wires.
The tip after tip burning by the tip burning method is straight and thin, so that auxiliary devices such as a magnifying glass and the like can be omitted, the die can be directly penetrated visually, the die penetrating difficulty is reduced, and the die penetrating efficiency is improved.
In one embodiment, the diameter of the wire to be tipped is 0.03mm to 0.3mm.
In one embodiment, the stretching is constant tension, constant speed stretching.
In one embodiment, the shape memory alloy suitable for the tip burning method is nickel-titanium shape memory alloy.
The following are specific examples.
Example 1
Referring to fig. 1, the tip burning device comprises a bottom plate 1, a first clamping jaw mounting seat 2, a second clamping jaw mounting seat 6, two clamping jaws 3, a direct-current constant-voltage constant-power heating device 5, a guide rod 7, a motor 8, a tension input end 9, a graduated scale 10 and a graduated scale indicator 11, wherein the first clamping jaw mounting seat 2 is fixed on the bottom plate 1, the two clamping jaws 3 are respectively fixed on the first clamping jaw mounting seat 2 and the second clamping jaw mounting seat 6 and used for clamping and fixing two ends of a nickel titanium wire 4, the motor 8 drives the second clamping jaw mounting seat 2 to move along the guide rod 7, the graduated scale indicator 11 is fixed on the second clamping jaw mounting seat 6 and moves along with the second clamping jaw mounting seat 6, the tension value is input through the tension input end 9, the tensile tension is controlled, and the elongation and the reduction ratio of the wire are calculated through the position of the graduated scale 10 indicated by the graduated scale indicator 11.
The method comprises the steps of fixing two ends of a nickel titanium wire to be sintered with the diameter of 0.3mm on a clamping jaw 3, setting constant voltage of a direct-current constant-voltage constant-power heating device 5 to be 12V, setting constant current to be 10A, opening the direct-current constant-voltage constant-power heating device 5 to preheat, turning the surface of the wire red after 5 s-10 s, continuously opening the direct-current constant-voltage constant-power heating device 5, simultaneously inputting a constant tension value of 30N at a tension input end 9, and enabling a second clamping jaw mounting seat 6 to uniformly move along a guide rod 7 at the speed of 2mm/s until the wire is broken.
Example 2
The method comprises the steps of fixing two ends of a nickel titanium wire to be sintered with the diameter of 0.1mm on a clamping jaw 3, setting constant voltage of a direct-current constant-voltage constant-power heating device 5 to be 12V, setting constant current to be 10A, opening the direct-current constant-voltage constant-power heating device 5 to preheat, turning the surface of the wire red after 5 s-10 s, continuously opening the direct-current constant-voltage constant-power heating device 5, simultaneously inputting a constant tension value of 4N at a tension input end 9, and enabling a second clamping jaw mounting seat 6 to uniformly move at the speed of 1mm/s along a guide rod 7 until the wire is broken.
Example 3
The two ends of the nickel titanium wire to be sintered with the diameter of 0.03mm are fixed on the clamping jaw 3, the constant voltage of the direct-current constant-voltage constant-power heating device 5 is 12V, the constant current is 10A, the direct-current constant-power heating device 5 is opened for preheating, the surface of the wire turns red after 5 s-10 s, the direct-current constant-power heating device 5 is continuously opened, and meanwhile, a constant tension value of 0.3N is input at the tension input end 9, so that the second clamping jaw mounting seat 6 moves at the uniform speed of 0.2mm/s along the guide rod 7 until the wire is broken.
Example 4
The method comprises the steps of fixing two ends of a nickel titanium wire to be sintered with the diameter of 0.1mm on a clamping jaw 3, setting constant voltage of a direct-current constant-voltage constant-power heating device 5 to be 15V, setting constant current to be 12A, opening the direct-current constant-voltage constant-power heating device 5 to preheat, turning the surface of the wire red after 5 s-10 s, continuously opening the direct-current constant-voltage constant-power heating device 5, simultaneously inputting a constant tension value of 4N at a tension input end 9, and enabling a second clamping jaw mounting seat 6 to uniformly move at the speed of 1mm/s along a guide rod 7 until the wire is broken.
Example 5
The method comprises the steps of fixing two ends of a nickel titanium wire to be sintered with the diameter of 0.1mm on a clamping jaw 3, setting constant voltage of a direct-current constant-voltage constant-power heating device 5 to be 10V, setting constant current to be 8A, opening the direct-current constant-voltage constant-power heating device 5 to preheat, turning the surface of the wire red after 5 s-10 s, continuously opening the direct-current constant-voltage constant-power heating device 5, simultaneously inputting a constant tension value of 4N at a tension input end 9, and enabling a second clamping jaw mounting seat 6 to uniformly move at the speed of 1mm/s along a guide rod 7 until the wire is broken.
Example 6
The method comprises the steps of fixing two ends of a nickel titanium wire to be sintered with the diameter of 0.1mm on a clamping jaw 3, setting constant voltage of a direct-current constant-voltage constant-power heating device 5 to be 12V, setting constant current to be 10A, opening the direct-current constant-voltage constant-power heating device 5 to preheat, turning the surface of the wire red after 5 s-10 s, continuously opening the direct-current constant-voltage constant-power heating device 5, simultaneously inputting a constant tension value of 4N at a tension input end 9, and enabling a second clamping jaw mounting seat 6 to uniformly move along a guide rod 7 at the speed of 2mm/s until the wire is broken.
Example 7
The method comprises the steps of fixing two ends of a nickel titanium wire to be sintered with the diameter of 0.1mm on clamping jaws 3, setting constant voltage of a direct-current constant-voltage constant-power heating device 5 to be 12V, setting constant current to be 10A, opening the direct-current constant-voltage constant-power heating device 5 to preheat, turning the surface of the wire red after 5 s-10 s, continuing to open the direct-current constant-voltage constant-power heating device 5, inputting a constant tension value of 4N at a tension input end 9, and enabling a second clamping jaw mounting seat 6 to uniformly move along a guide rod 7 at the speed of 0.2mm/s until the wire is broken.
Comparative example 1
The existing chemical corrosion tip burning method is adopted, 0.10mm of wire materials to be burned are placed in mixed solution of hydrofluoric acid, nitric acid and water (HF: HNO 3:H2 O volume ratio is 1:3:10), and oxidation films and graphite emulsion are arranged on the surfaces of the wires for protection, so that the wires are not easy to corrode; placing the 0.10mm to-be-burned tip wire polished to a bright surface in a mixed solution of hydrofluoric acid and nitric acid (HF: HNO 3 volume ratio is 1:3), corroding the wire for 5-10s, and reacting the surface of the wire vigorously; and taking out the wire, and flushing with clear water to obtain the corroded tip.
Comparative example 2
The prior grinding method is adopted, 0.10mm of to-be-burned tip wire is put on a grinding wheel rotating at high speed for light rotary grinding; the wire is taken out and washed with clear water to obtain a ground tip.
Comparative example 3
The alternating current is adopted for electric heating, the tip burning device shown in fig. 1 is adopted, two ends of a nickel titanium wire to be burned with the diameter of 0.1mm are fixed on the clamping jaw 3, the heating device 5 is replaced by an ultrahigh frequency heating coil, the parameters are 380V, the frequency is 700KHZ-1100KHZ, the electric heating device is opened for preheating, the surface of the wire turns red after 2 s-5 s, a constant tension value 4N is input at the tension input end 9, and the second clamping jaw mounting seat 6 moves at the uniform speed of 1mm/s along the guide rod 7 until the wire is broken.
Comparative example 4
Comparative example 4 compared with example 2, the constant voltage is overlarge, two ends of the 0.1mm nickel titanium wire to be sintered are fixed on the clamping jaw 3, the constant voltage of the direct-current constant-voltage constant-power heating device 5 is set to be an overlarge value of 24V, the constant current is 10A, the direct-current constant-voltage constant-power heating device 5 is opened for preheating, the surface of the wire turns red after 5 s-10 s, the direct-current constant-voltage constant-power heating device 5 is continuously opened, meanwhile, a constant tension value of 4N is input at the tension input end 9, and the second clamping jaw mounting seat 6 moves at a uniform speed of 1mm/s along the guide rod 7 until the wire is broken.
Comparative example 5
Comparative example 5 compared with example 2, the constant current is overlarge, two ends of the 0.1mm nickel titanium wire to be sintered are fixed on the clamping jaw 3, the constant voltage of the direct-current constant-voltage constant-power heating device 5 is set to be 12V, the constant current is an overlarge value 20A, the direct-current constant-voltage constant-power heating device 5 is opened for preheating, the surface of the wire turns red after 5 s-10 s, the direct-current constant-voltage constant-power heating device 5 is continuously opened, meanwhile, a constant tension value 4N is input at the tension input end 9, and the second clamping jaw mounting seat 6 moves at a uniform speed of 2mm/s along the guide rod 7 until the wire is broken.
Comparative example 6
Comparative example 6 compared with example 2, the constant voltage is too small, two ends of the 0.1mm nickel titanium wire to be sintered are fixed on the clamping jaw 3, the constant voltage of the direct-current constant-voltage constant-power heating device 5 is set to be too small 6V, the constant current is 10A, the direct-current constant-power heating device 5 is opened for preheating, the surface of the wire turns red after 5 s-10 s, the direct-current constant-voltage constant-power heating device 5 is continuously opened, meanwhile, a constant tension value 4N is input at the tension input end 9, and the second clamping jaw mounting seat 6 moves at a uniform speed of 2mm/s along the guide rod 7 until the wire is broken.
Comparative example 7
Comparative example 7 compared with example 2, the constant current is too small, two ends of the 0.1mm nickel titanium wire to be sintered are fixed on the clamping jaw 3, the constant voltage of the direct-current constant-voltage constant-power heating device 5 is set to be 12V, the constant current is too small 5A, the direct-current constant-voltage constant-power heating device 5 is opened for preheating, the surface of the wire turns red after 5 s-10 s, the direct-current constant-voltage constant-power heating device 5 is continuously opened, meanwhile, a constant tension value 4N is input at the tension input end 9, and the second clamping jaw mounting seat 6 moves at the uniform speed of 1mm/s along the guide rod 7 until the wire is broken.
The reduction ratios of the tips obtained in examples 1 to 7 and comparative examples 1 to 7 are shown in Table 1.
Table 1: tip parameters and face reduction ratio of each example and each comparative example
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the claims. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (5)
1. A method for sharpening shape memory alloy ultrafine filaments, which is characterized by comprising the following steps:
pre-tightening and stretching the two ends of the wire to be burned, and respectively fixing the two ends of the wire;
A direct-current constant-voltage constant-power heating device is arranged below the wire, and generates heat to preheat the wire;
The direct-current constant-voltage constant-power heating device continues to heat the wire, and stretches the wire between the two fixed ends until the wire breaks to obtain a die penetrating tip; the direct-current constant-voltage constant-current heating device has the voltage of 10V-15V, the current of 8A-12A and the power of 80W-180W; the tensile force of the stretching is as follows:
In the formula, r represents the radius of the wire material, and the unit is mm;
the stretching speed is 0.2 mm/s-2 mm/s.
2. The method for firing the shape memory alloy ultrafine wire according to claim 1, wherein the diameter of the wire to be fired is 0.03mm to 0.3mm.
3. The method of sharpening shape memory alloy ultrafine filaments of claim 1, wherein the stretching is constant tension constant speed stretching.
4. The method of sharpening a shape memory alloy ultrafine wire according to claim 1, wherein the shape memory alloy is a nickel-titanium shape memory alloy.
5. The method for firing the shape memory alloy ultrafine wire according to claim 1, wherein the preheating time is 5s to 10s.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410233963.XA CN118595198A (en) | 2024-03-01 | 2024-03-01 | Sharp burning method of shape memory alloy ultrafine filament |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410233963.XA CN118595198A (en) | 2024-03-01 | 2024-03-01 | Sharp burning method of shape memory alloy ultrafine filament |
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| CN118595198A true CN118595198A (en) | 2024-09-06 |
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| CN202410233963.XA Pending CN118595198A (en) | 2024-03-01 | 2024-03-01 | Sharp burning method of shape memory alloy ultrafine filament |
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