CN108856435B - Hot spinning forming device and method for nickel titanium based shape memory alloy pipe joint - Google Patents

Hot spinning forming device and method for nickel titanium based shape memory alloy pipe joint Download PDF

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CN108856435B
CN108856435B CN201810588002.5A CN201810588002A CN108856435B CN 108856435 B CN108856435 B CN 108856435B CN 201810588002 A CN201810588002 A CN 201810588002A CN 108856435 B CN108856435 B CN 108856435B
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die insert
core die
shape memory
memory alloy
pipe joint
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CN108856435A (en
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张艳秋
江树勇
武桂香
王满
闫丙尧
孙冬
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Harbin Engineering University
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Harbin Engineering University
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/14—Spinning
    • B21D22/16—Spinning over shaping mandrels or formers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D37/00—Tools as parts of machines covered by this subclass
    • B21D37/10—Die sets; Pillar guides
    • B21D37/12—Particular guiding equipment, e.g. pliers; Special arrangements for interconnection or cooperation of dies

Abstract

The invention provides a hot spinning forming processing device and method for a nickel titanium base shape memory alloy pipe joint, which comprises a core mold insert, a bottom plate, a base plate, a screw, a positioning block and a pin; the core die insert comprises five core die insert blocks, the first core die insert block and the third core die insert block have the same structure and are symmetrical to each other, a first dovetail groove and a second dovetail groove are respectively arranged on the inner walls of the first core die insert block and the third core die insert block, a first dovetail groove and a second dovetail groove are arranged on the outer wall of the second core die insert, and the first dovetail groove and the second dovetail groove are respectively matched with the first dovetail groove and the second dovetail groove; the fourth core module insert and the fifth core module insert have the same structure and are symmetrical to each other, the bottoms of the fourth core module insert and the fifth core module insert are respectively provided with a third dovetail groove and a fourth dovetail groove, and the third dovetail groove and the fourth dovetail groove are matched with the third dovetail groove; the invention solves the problem that the annular inner rib is difficult to demould after being formed; the accurate forming of the inner rib of the shape memory alloy pipe joint can be realized, no processing trace is left at the inner rib, and the stress corrosion resistance of the pipe joint can be improved.

Description

Hot spinning forming device and method for nickel titanium based shape memory alloy pipe joint
Technical Field
The invention relates to a pipe joint machining device and method, in particular to a nickel titanium based shape memory alloy pipe joint spin forming machining device and method, and belongs to the field of spin forming machining.
Background
The nickel titanium based shape memory alloy has wide application in the fields of aerospace and ships due to the shape memory effect, wherein the most typical application case is the shape memory alloy pipe joint. The basic principle of the application of the nickel titanium based shape memory alloy pipe joint is as follows: the method comprises the steps of expanding and deforming a shape memory alloy pipe joint with the inner diameter smaller than the outer diameter of a connected pipe in a low-temperature martensite phase to enable the inner diameter to be larger than the outer diameter of the connected pipe, inserting the connected pipe into the pipe joint, and then heating the pipe joint to an austenite phase to enable the pipe joint to shrink and deform due to the shape memory effect, so that constraint stress is generated on the connected pipe, and connection is achieved. Compared with threaded connection and welding connection, the shape memory alloy pipe joint has the advantages of convenient connection and installation, high reliability, no leakage and light weight, and is particularly suitable for connection of dissimilar pipes. At present, the core technology of the forming and manufacturing of the nickel titanium base shape memory alloy pipe joint is still monopolized by developed countries in the west, and the nickel titanium base shape memory alloy pipe joint adopted by China at present mainly depends on import and is quite expensive. Because the surface contact is difficult to realize better sealing effect, the nickel titanium base shape memory alloy pipe joint is usually designed into a structure with a plurality of annular inner ribs to realize line contact, thereby obviously improving the sealing effect. However, because the annular ribs are positioned on the inner wall of the pipe joint, the annular ribs are usually machined by adopting a machining mode, however, the nickel titanium based shape memory alloy has higher machining difficulty and serious cutter abrasion, and in addition, the nickel titanium based shape memory alloy has higher elasticity and is difficult to ensure the dimensional precision. Therefore, the invention provides a new method for realizing the accurate manufacturing of the nickel titanium base shape memory alloy pipe joint by adopting spinning forming aiming at the urgent need of the localization of the nickel titanium base shape memory alloy pipe joint.
Disclosure of Invention
The invention aims to provide a hot spinning forming processing device for a nickel titanium base shape memory alloy pipe joint, which can smoothly take out the nickel titanium base shape memory alloy pipe joint.
The purpose of the invention is realized as follows:
a hot spinning forming processing device for a nickel titanium based shape memory alloy pipe joint comprises a core mold insert, a bottom plate, a base plate, a screw, a positioning block and a pin; the core die insert comprises five core die insert blocks, wherein the first core die insert block and the third core die insert block have the same structure and are symmetrical to each other, a first dovetail groove and a second dovetail groove are respectively arranged on the inner walls of the first core die insert block and the third core die insert block, a first dovetail groove and a second dovetail groove are arranged on the outer wall of the second core die insert, and the first dovetail groove and the second dovetail groove are respectively matched with the first dovetail groove and the second dovetail groove; the fourth core module insert and the fifth core module insert have the same structure and are symmetrical to each other, the bottoms of the fourth core module insert and the fifth core module insert are respectively provided with a third dovetail groove and a fourth dovetail groove, and the third dovetail groove and the fourth dovetail groove are matched with the third dovetail groove; the bottom plate is sleeved on the outer edge of the base plate and fixed by screws, and the positioning block is installed on the bottom plate and fixed by pins.
The invention also includes such structural features:
1. a through hole is formed in the second core mold insert;
2. the handle can be inserted into the through hole;
3. the material of the processing device is hot work die steel H13 steel.
The invention also aims to provide a hot spinning forming processing method of the nickel titanium base shape memory alloy pipe joint, which can simultaneously and accurately form the annular inner ribs of the nickel titanium base shape memory alloy pipe joint.
A hot spinning forming processing method for a nickel titanium base shape memory alloy pipe joint comprises the following steps:
the method comprises the following steps: determining the size of a tube blank of the nickel titanium base shape memory alloy: inner diameter d0Wall thickness t0And length l0；
d0Wall thickness t equal to the inside diameter of the pipe joint0And length l0Calculated according to the following formula:
t0＝tw/φ
in the formula (I), the compound is shown in the specification,
twthe pipe joint has the wall thickness phi of 50-60 percent, and the phi is the wall thickness reduction rate;
Figure GDA0002309845780000021
in the formula:
v is the volume of the pipe joint, and delta l is the machining allowance which comprises the allowance left by the fixed end;
step two: mounting a processing device;
mounting the processing device on a spindle of a spinning machine, fixing a bottom plate and the spindle of the spinning machine together during mounting, and enabling the axis of the processing device to be parallel to a horizontal plane;
step three: installing the tube blank;
preparing a nickel titanium base shape memory alloy tube blank according to the size calculated in the step one, wherein one end of the nickel titanium base shape memory alloy tube blank is provided with a notch matched with the positioning blockThe other end is 1/4t0Chamfering at 45 degrees, and sleeving the nickel titanium base shape memory alloy tube blank on the assembled core mould;
step four: spinning and forming;
simultaneously heating the nickel titanium base shape memory alloy tube blank and a processing device, and carrying out spinning forming at the temperature of 750-850 ℃, wherein the reduction rate of each pass is 15-20% and the feed ratio is 1.2-1.6 mm/r, and the wall thickness of the nickel titanium base shape memory alloy tube blank formed by spinning is 0.1mm larger than the wall thickness of a tube joint;
step five: finishing;
and after the spinning forming is finished, stopping heating, cooling to room temperature, and performing surface finishing spinning to ensure that the wall thickness of the nickel titanium base shape memory alloy tube blank formed by the finishing spinning is equal to the wall thickness of the tube joint.
Step six: taking a part;
inserting a handle into a through hole in a second core die insert, moving the handle to pull out the second core die insert outwards along the axial direction, simultaneously driving the first core die insert and a third core die insert to move towards the center, when the protruding outer ribs on the outer surfaces of the first core die insert and the third core die insert are completely separated from rib grooves of the pipe joint, continuously pulling the handle to pull out the second core die insert outwards, then pushing a fourth core die insert and a fifth core die insert to move towards the center, and taking down the pipe joint after the protruding outer ribs on the outer surfaces of the fourth core die insert and the fifth core die insert are also separated from the rib grooves of the pipe joint;
step seven: restoring the processing device to the original state;
moving a fourth core die insert and a fifth core die insert outwards to the outer edge of the base plate to enable the outer edge of the base plate to be close to the inner wall of the base plate, and then inserting the first core die insert, the second core die insert and the third core die insert into a position between the fourth core die insert and the fifth core die insert along a dovetail slide way;
step eight: and removing excess materials.
The invention also includes such features:
1. adopting a thermocouple to measure the temperature in the fourth step;
2. and in the fourth step, the spinning forming is carried out in a reverse spinning mode.
Compared with the prior art, the invention has the beneficial effects that:
1. the problem that the annular inner rib is difficult to demould after being formed is solved;
2. the accurate forming of the inner rib of the shape memory alloy pipe joint can be realized, no mechanical processing trace is left at the inner rib, and the stress corrosion resistance of the pipe joint can be improved;
3. a plurality of annular inner ribs can be formed at the same time, so that the production efficiency is improved;
4. the forming of the inner rib pipe joints with different sizes can be realized only by replacing the core mould insert, and the production cost can be reduced.
Drawings
FIG. 1 is a schematic view of a shape memory alloy tube joint;
FIG. 2a is a schematic top view of a spin forming apparatus;
FIG. 2b is a cross-sectional view of FIG. 2 a;
FIG. 2c is a cross-sectional view of FIG. 2 a;
FIG. 3a is a front view of a first and third core module insert configuration;
FIG. 3b is a side view of the first and third core module insert structures;
FIG. 3c is a sectional view taken along line A-A of FIG. 3 b;
FIG. 4a is a front view of a fourth and fifth core module insert configuration;
FIG. 4b is a top view of a fourth and fifth core module insert configuration;
FIG. 4c is a side view of a fourth and fifth core module insert structure;
FIG. 4d is a bottom view of the fourth and fifth core module insert structures;
FIG. 5a is a front view of the pad structure;
FIG. 5b is a top view of the pad structure;
FIG. 5c is a side view of the dunnage structure;
FIG. 6a is a front view of the floor structure;
FIG. 6b is a top view of the floor structure;
figure 7a is a schematic top view of the tube blank after it has been mounted in the processing apparatus;
FIG. 7b is a cross-sectional view of FIG. 7 a;
FIG. 7c is a cross-sectional view of FIG. 7 a;
FIG. 8a is a schematic top view of the assembly of the tube fitting to the machining apparatus after spin forming;
FIG. 8b is a cross-sectional view of FIG. 8 a;
FIG. 8c is a cross-sectional view of FIG. 8 a;
fig. 9a is a schematic top view of the first core die insert, the second core die insert and the third core die insert during extraction;
FIG. 9b is a cross-sectional view of FIG. 9 a;
FIG. 9c is a cross-sectional view of FIG. 9 a;
FIG. 10a is a schematic top view in elevation of the post-demolded condition;
FIG. 10b is a cross-sectional view of FIG. 10 a;
fig. 10c is a cross-sectional view of fig. 10 a.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
A hot spinning forming processing device for a nickel titanium based shape memory alloy pipe joint comprises a core mold insert, a bottom plate 4, a base plate 5, a screw 6, a positioning block 7 and a pin 8; the core die insert comprises five core die insert blocks, wherein the first core die insert block 1 and the third core die insert block 3 have the same structure and are symmetrical to each other, a first dovetail groove and a second dovetail groove are respectively arranged on the inner walls of the first core die insert block and the third core die insert block, a first dovetail groove and a second dovetail groove are arranged on the outer wall of the second core die insert block 2, and the first dovetail groove and the second dovetail groove are respectively matched with the first dovetail groove and the second dovetail groove; the fourth core die insert 9 and the fifth core die insert 10 are identical in structure and symmetrical to each other, the bottoms of the fourth core die insert and the fifth core die insert are respectively provided with a third dovetail groove and a fourth dovetail groove, and the third dovetail groove and the fourth dovetail groove are matched with the third dovetail groove; the bottom plate 4 is sleeved on the outer edge of the base plate 5 and fixed by screws 6, and the positioning block is installed on the bottom plate and fixed by pins 8.
The second core mould insert 2 is provided with a through hole;
the invention also comprises a handle 13, wherein the handle 13 can be inserted into the through hole;
the material of the processing device is hot work die steel H13 steel.
The invention aims to provide a spinning method capable of accurately forming a plurality of annular inner ribs on the pipe wall and the inner wall of a nickel titanium-based shape memory alloy pipe joint (shown in figure 1) at the same time, and a special tool (shown in figure 2) is designed to ensure that the pipe joint 12 is taken out smoothly after spinning forming.
The invention specifically comprises the following contents:
the first step is as follows: the size of the nickel titanium based shape memory alloy tube blank 11 is determined. Tube blank 11 dimensions include inside diameter d0Wall thickness t0And length l0. Wherein d is0Wall thickness t equal to the inside diameter of pipe joint 120Should be determined according to equation (1).
t0＝tw/φ(1)
In the formula (1), t0Is the wall thickness of the tube blank, twThe thickness of the pipe joint part is measured, phi is the wall thickness reduction rate, and is generally 50-60%. Length of tube blank l0And (4) calculating according to a volume invariant principle, and obtaining the volume of the pipe joint part through the calculated volume by the formula (2).
Figure GDA0002309845780000051
In the formula (2), V is the volume of the pipe joint part, and delta l is the machining allowance, including the allowance left by the fixed end.
The second step is that: the spin forming tooling shown in fig. 2 was fixed to a spinning machine. The spinning tool structure comprises a first core die insert 1, a second core die insert 2, a third core die insert 3, a bottom plate 4, a base plate 5, a screw 6, a positioning block 7, a pin 8, a fourth core die insert 9 and a fifth core die insert 10. The first core die insert 1 and the third core die insert 3 have the same shape and size and are symmetrical to each other, and dovetail grooves are respectively machined on the inner walls of the two inserts, as shown in fig. 3. The outer wall of the second core die insert 2 is provided with dovetails corresponding to the two dovetail grooves, and when the second core die insert is axially drawn out, the dovetails can slide in the dovetail grooves of the first core die insert 1 and the third core die insert 3 and drive the two inserts to move towards the center, so that the protruding outer ribs on the outer surface of the second core die insert are separated from the rib grooves of the pipe joint. The fourth core die insert 9 and the fifth core die insert 10 have the same shape and size and are symmetrical to each other, and the bottoms of the two inserts are respectively provided with a dovetail, as shown in fig. 4, the two inserts can slide in a dovetail groove on a base plate 5 (as shown in fig. 5), and the two inserts are pushed towards the center, so that the protruding outer ribs on the outer surface of the two inserts can be separated from rib grooves of the pipe joint. During assembly, the dovetails of the fourth core die insert 9 and the fifth core die insert 10 are required to be assembled in the dovetail grooves of the base plate 5, then the base plate is sleeved on the outer edge of the base plate, and finally the base plate and the base plate are fixed through the screws 6. In addition, in order to prevent the rotation of the blank tube 11 in the circumferential direction during spinning, a positioning block 7 is further mounted on the base plate 4 (shown in fig. 6), and both are fixed by pins 8. When the spinning tool is installed on the spinning machine, the end of the base needs to be connected with a spindle of the spinning machine. In order to ensure that the tool has enough strength and hardness during hot spinning forming, the tool parts are all made of hot-work die steel H13 steel.
The third step: and (5) installing the tube blank. Preparing a shape memory alloy tube blank according to the size of the tube blank calculated in the step one, processing one end of the tube blank into a notch with the size matched with the size of the positioning block 7 on the tool, and processing the other end of the tube blank into an 1/4t0 multiplied by 45 degree chamfer angle so as to be convenient for the biting of a spinning wheel. Then the tube blank is sleeved on the assembled core mould, and the opening of the tube blank is clamped on the positioning block 7, as shown in figure 7.
The fourth step: and (4) spinning and forming. The spin forming is performed in a reverse spin manner, that is, a spin wheel is screwed from the side close to the second core mold insert 2. The spinning is carried out by heating the tube blank and the tool simultaneously by a fire gun, measuring the temperature by adopting a thermocouple, and carrying out the first spinning forming when the temperature of the tube blank reaches 850 ℃. Continuously carrying out spinning forming of three passes, wherein the tube blank and the tool are heated before each pass of spinning, and the temperature of the tube blank and the tool is kept at 750-850 ℃. During spinning, the reduction rate of each pass is 15% -20%, the feeding ratio is 1.2-1.6 mm/r, and the wall thickness of a finally formed workpiece is 0.1mm larger than that of a pipe joint 12 part. The state after the spin forming is shown in fig. 8.
The fifth step: and (6) finishing. After the spinning is completed, the heating is stopped. And after the part is cooled to room temperature, performing surface finishing spinning on the part, and finally enabling the wall thickness to reach the design size of the part.
And a sixth step: and (6) taking the workpiece. The handle 13 is first inserted into the hole in the second core die insert 2 as shown in figure 8. The second core die insert 2 is pulled out axially by the moving handle 13, because the dovetail on the second core die insert 2 is in sliding fit with the dovetail grooves on the inner walls of the first core die insert 1 and the third core die insert 3, the first core die insert 1 and the third core die insert 3 are driven to move towards the center by pulling out axially, and when the protruding outer ribs on the outer surfaces of the first core die insert 1 and the third core die insert 3 are completely separated from the rib grooves of the pipe joint, the second core die insert 2 can be pulled out axially by pulling outwards continuously, as shown in fig. 9. Then, the fourth core insert 9 and the fifth core insert 10 are pushed by a tool to move towards the center, so that the protruding outer ribs on the outer surface of the fourth core insert and the fifth core insert are also separated from the rib grooves, and then the pipe joint part 12 can be taken down, as shown in fig. 10.
The seventh step: and (5) restoring the tool to the original state. Firstly, the fourth core insert 9 and the fifth core insert 10 are moved outwards to the outer edge of the backing plate 5 by a tool, so that the outer edge is abutted against the inner wall of the base plate 4, then the first core insert 1, the second core insert 2 and the third core insert 3 are inserted into a gap between the fourth core insert 9 and the fifth core insert 10 along a dovetail slide way, and finally the tool can be restored to the state shown in fig. 2.
Eighth step: and removing excess materials. The spin formed shape memory alloy coupling was turned to the length dimension shown in figure 1.
Example (b):
the first step is as follows: and determining the size of the shape memory alloy tube blank. The shape of the part to be processed is shown in figure 1, the part is a nickel titanium shape memory alloy pipe joint, and the part is a cylindrical part with three annular inner ribs on the inner wall. And according to the size of the part, calculating the size of the tube blank before spinning according to the formula of the first step.
The second step is that: and (6) installing a tool. Firstly, the spinning tool shown in fig. 2 is installed on a spindle of a spinning machine, and during installation, a base 4 and the spindle of the spinning machine are required to be fixed together, and the axis of the spinning tool is parallel to the horizontal plane.
The third step: and (5) installing the tube blank. Preparing a shape memory alloy tube blank according to the size of the tube blank calculated in the step one, processing one end of the tube blank into a notch with the size matched with the size of the positioning block 7 on the tool, and processing the other end of the tube blank into 1/4t0Chamfering at 45 degrees, and then sleeving the pipe blank on the assembled core mould according to the figure 7, so that the notch of the pipe blank is clamped on the positioning block 7.
The fourth step: and (4) spinning and forming. And simultaneously heating the tube blank and the tool by using a fire gun, measuring the temperature by using a thermocouple, starting the first-pass spinning forming when the temperature of the tube blank reaches 850 ℃, and screwing the spinning wheel into the second core die insert 2 from one side when spinning. Firstly, continuously carrying out spinning forming of three passes, wherein the tube blank and the tool are heated before each pass of spinning, and the temperature of the tube blank and the tool is kept at 750-850 ℃. During spinning, the reduction rate of each pass is 15% -20%, the feeding ratio is 1.2-1.6 mm/r, and the wall thickness of a finally formed workpiece is 0.1mm larger than that of a pipe joint part. The state after the spin forming is shown in fig. 8.
The fifth step: and (6) finishing. After the spinning is completed, the heating is stopped. And after the part is cooled to room temperature, performing surface finishing spinning on the part, and finally enabling the wall thickness to reach the design size of the part.
And a sixth step: and (6) taking the workpiece. The handle 13 is first inserted into the hole in the second core die insert 2 as shown in figure 8. The handle 13 is moved to pull out the second core mold insert 2 axially and outwardly, and at the same time, the first core mold insert 1 and the third core mold insert 3 are driven to move toward the center, and when the protruding outer ribs on the outer surfaces of the first core mold insert 1 and the third core mold insert 3 are completely separated from the rib grooves of the pipe joint, the second core mold insert 2 can be pulled out axially and outwardly, as shown in fig. 9. Then, the fourth core die insert 9 and the fifth core die insert 10 are pushed by a tool to move towards the center, so that the protruding outer ribs on the outer surface of the core die insert can be separated from the rib grooves of the pipe joint, and then the pipe joint part can be taken down, as shown in fig. 10.
The seventh step: and (5) restoring the tool to the original state. Firstly, the fourth core insert 9 and the fifth core insert 10 are moved outwards to the outer edge of the backing plate 5 by a tool, so that the outer edge is close to the inner wall of the bottom plate 4, and then the first core insert 1, the second core insert 2 and the third core insert 3 are inserted into the space between the fourth core insert 9 and the fifth core insert 10 along the dovetail slide way. The recovered tooling should be as shown in fig. 2.
Eighth step: and removing excess materials. The spin formed shape memory alloy coupling was turned to the length dimension shown in figure 1.

Claims (3)

1. A hot spinning forming processing method of a nickel titanium based shape memory alloy pipe joint is characterized by comprising the following steps:
the method comprises the following steps: determining the size of a tube blank of the nickel titanium base shape memory alloy: inner diameter d0Wall thickness t0And length l0；
d0Wall thickness t equal to the inside diameter of the pipe joint0And length l0Calculated according to the following formula:
t0＝tw/φ
in the formula (I), the compound is shown in the specification,
twthe pipe joint has the wall thickness phi of 50-60 percent, and the phi is the wall thickness reduction rate;
Figure FDA0002309845770000011
in the formula:
v is the volume of the pipe joint, and delta l is the machining allowance which comprises the allowance left by the fixed end;
step two: mounting a processing device;
mounting the processing device on a spindle of a spinning machine, fixing a bottom plate and the spindle of the spinning machine together during mounting, and enabling the axis of the processing device to be parallel to a horizontal plane;
step three: installing the tube blank;
preparing a nickel titanium base shape memory alloy tube blank according to the size calculated in the step one, wherein one end of the nickel titanium base shape memory alloy tube blank is provided with a notch matched with the positioning block, and the other end of the nickel titanium base shape memory alloy tube blank is 1/4t0Chamfering at 45 degrees, and sleeving the nickel titanium base shape memory alloy tube blank on the assembled core mouldThe above step (1);
step four: spinning and forming;
simultaneously heating the nickel titanium base shape memory alloy tube blank and a processing device, and carrying out spinning forming at the temperature of 750-850 ℃, wherein the reduction rate of each pass is 15-20% and the feed ratio is 1.2-1.6 mm/r, and the wall thickness of the nickel titanium base shape memory alloy tube blank formed by spinning is 0.1mm larger than the wall thickness of a tube joint;
step five: finishing;
after the spinning forming is finished, stopping heating, cooling to room temperature, and performing surface finishing spinning to ensure that the wall thickness of the nickel titanium base shape memory alloy tube blank formed by the finishing spinning is equal to the wall thickness of the tube joint;
step six: taking a part;
inserting a handle into a through hole in a second core die insert, moving the handle to pull out the second core die insert outwards along the axial direction, simultaneously driving the first core die insert and a third core die insert to move towards the center, when the protruding outer ribs on the outer surfaces of the first core die insert and the third core die insert are completely separated from rib grooves of the pipe joint, continuously pulling the handle to pull out the second core die insert outwards, then pushing a fourth core die insert and a fifth core die insert to move towards the center, and taking down the pipe joint after the protruding outer ribs on the outer surfaces of the fourth core die insert and the fifth core die insert are also separated from the rib grooves of the pipe joint;
step seven: restoring the processing device to the original state;
moving a fourth core die insert and a fifth core die insert outwards to the outer edge of the base plate to enable the outer edge of the base plate to be close to the inner wall of the base plate, and then inserting the first core die insert, the second core die insert and the third core die insert into a position between the fourth core die insert and the fifth core die insert along a dovetail slide way;
step eight: and removing excess materials.
2. The hot-spinning forming method of the NiTi-based shape memory alloy pipe joint as claimed in claim 1, wherein in the fourth step, the temperature is measured by using a thermocouple.
3. The hot-spinning forming method of the nitinol-based shape memory alloy pipe joint according to claim 1 or 2, wherein the spinning forming is performed in a reverse-spinning manner in the fourth step.
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