CN117107177B - Mechanical training method and device for realizing high strength and high hardness of Ti-V-Al-Zr memory alloy - Google Patents

Abstract

The invention relates to the technical field of metal testing, and in particular to a mechanical training device for realizing high strength and high hardness of a Ti-V-Al-Zr shape memory alloy. The device comprises a mounting plate and a placement block, wherein the placement block is fixedly connected to one end of the mounting plate, a fixing component is installed on the placement block, and the fixing component comprises a pressing plate, a limit block, a push plate, a diamond block, the limit block is slidably connected to the placement block, the push plate is fixedly connected to the lower end of the limit block, the diamond block is rotatably connected to the placement block, and one end of the diamond block is slidably connected to a support rod. The invention stretches a tensile specimen to 6% deformation under room temperature conditions, and then unloads the specimen. The purpose of performing different training times is to regulate its microstructure and optimize the high-performance Ti-V-Al-Zr shape memory alloy having both excellent mechanical properties and hardness.

Description

Mechanical training method and device for achieving high strength and high hardness of Ti-V-Al-Zr memory alloy

Technical Field

The invention relates to the technical field of metal testing, in particular to a mechanical training method and device for achieving high strength and high hardness of a Ti-V-Al-Zr memory alloy.

Background technique

Composite materials have many excellent properties and are widely used in aerospace vehicles. In the application of composite materials in aerospace vehicles, the connection between composite materials is inevitable, and 60%-80% of the damage and failure of composite material structures occur at the joints of composite materials. Traditional riveting technology has many disadvantages such as large impact force, non-uniform interference, and poor reliability. Shape memory alloy connectors can realize a new type of intelligent connection between heterogeneous materials without impact, uniform and controllable interference, and high reliability based on the shape memory effect.

The strength and hardness of Ti-V-Al lightweight shape memory alloy are low, which will lead to insufficient bearing capacity of lightweight shape memory alloy connectors between composite materials. Therefore, it is urgent to explore new principles and methods to improve the strength and hardness of Ti-V-Al based lightweight shape memory alloys in order to achieve intelligent, safe and reliable connection between composite materials in aerospace vehicles.

Summary of the invention

The purpose of the present invention is to solve the following shortcomings in the prior art: the strength and hardness of Ti-V-Al lightweight shape memory alloy are relatively low, which will lead to insufficient bearing capacity of lightweight shape memory alloy connectors connecting composite materials. Therefore, it is urgent to explore new principles and methods to improve the strength and hardness of Ti-V-Al-based lightweight shape memory alloys to achieve intelligent, safe and reliable connection between composite materials in aerospace vehicles. The proposed mechanical training method and device for achieving high strength and high hardness of Ti-V-Al-Zr shape memory alloys.

In order to achieve the above object, the present invention adopts the following technical solutions:

A mechanical training device for realizing high strength and high hardness of Ti-V-Al-Zr memory alloy comprises a mounting plate and a placement block, wherein the placement block is fixedly connected to one end of the mounting plate;

The placing block is provided with a fixing component, which includes a pressing plate, a limiting block, a pushing plate, and a diamond block. The limiting block is slidably connected to the placing block, the pushing plate is fixedly connected to the lower end of the limiting block, the diamond block is rotatably connected to the placing block, one end of the diamond block is slidably connected to a support rod, the pressing plate is slidably connected to the placing block, and the support rod is hinged to the pressing plate;

A pulling component is installed at one end of the mounting plate away from the placing block, and the pulling component includes a moving block, a pressure plate, a cam, a fixed block, a gear rod, and a rack plate. The moving block is slidably connected to the mounting plate, the fixed block is fixedly connected to the mounting plate, the pressure plate is slidably connected to the moving block, the gear rod is rotatably connected to the fixed block, the cam is fixedly connected to the gear rod, the rack plate is slidably connected to the mounting plate and meshed with the gear rod, the rack plate is L-shaped and slidably connected to one end of the diamond block, and a first spring is connected between the rack plate and the mounting plate.

Preferably, the fixing component further comprises a protrusion and a fourth spring, the protrusion is fixedly connected to the placing block, and the fourth spring is fixedly connected between the protrusion and the pushing plate.

Preferably, the pulling component further includes a square plate and a third spring, the square plate is fixedly connected to the mounting plate, and the third spring is fixedly connected between the square plate and the moving block.

Preferably, an L-shaped plate is fixedly connected to the moving block, a hydraulic rod is fixedly connected to the L-shaped plate, and one end of the hydraulic rod is fixedly connected to the pressure plate.

Preferably, a clamping plate is slidably connected to the mounting plate, the clamping plate is fixedly connected to the rack plate, and a grinding plate is slidably connected to the lower end of the clamping plate.

Preferably, one end of the mounting plate is fixedly connected to a first transverse plate, and a screw rod is threadedly connected to the first transverse plate.

Preferably, a second transverse plate is fixedly connected to the mounting plate, a sliding rod is slidably connected to the second transverse plate, a second spring is fixedly connected between one end of the sliding rod and the second transverse plate, and round blocks are respectively provided on the sliding rod and the screw rod.

Preferably, a cushion block is fixedly connected to the mounting plate, and the cushion block is arranged between the placement block and the moving block.

The mechanical training device realizes the mechanical training method of high strength and high hardness of Ti-V-Al-Zr memory alloy, comprising the following steps:

S1: Place the stretched strip after heat treatment between the two round blocks, and rotate the screw rod. The screw rod moves to the right on the first horizontal plate, pushing the strip to move right and squeezing the slide bar while stretching the second spring. At this time, place 400# sandpaper in the clamping plate, with the steel on the upper side of the strip. Then connect the middle part of the diamond block to the external servo motor, and drive the diamond block to swing back and forth. When the lower end of the diamond block swings to the left, it can push the rack plate to move to the left. When the lower end of the diamond block moves to the right and no longer exerts a squeezing force on the rack plate, the rack plate resets and moves under the elastic force of the first spring, realizing the reciprocating motion of the rack plate. The grinding plate can grind the long strip alloy through the clamping plate as the rack plate reciprocates. By replacing 800# and 1500# sandpaper, grinding with different precisions can be performed to remove the oxide scale on the surface.

S2: Place the polished tensile specimen between the mounting plate and the moving block. When the upper end of the diamond block swings to the right, the pressing plate can be pushed to move right and squeeze the limit block to slide down. When the push plate moves down with the limit block, one end of the polished tensile specimen can be fixed. At the same time, the hydraulic rod is driven to extend and push the pressing plate down to fix the other end of the polished tensile specimen.

When the rack plate moves to the left, S3 can drive the gear rod to rotate clockwise, and drive the cam to push the moving block to move to the right. At this time, the moving block can pull the polished tensile specimen for stretching. The tensile specimen is stretched to 6% deformation at room temperature and then unloaded. This process is carried out 5 times, 10 times and 25 times respectively. The different training times are used to regulate its microstructure and optimize the high-performance Ti-V-Al-Zr shape memory alloy with excellent mechanical properties and hardness. The Ti-V-Al-Zr shape memory alloy tensile specimens with different training times are subjected to tensile experiments and microhardness tests.

Compared with the prior art, the present invention has the following beneficial effects:

During the reciprocating motion of the rack plate, the grinding plate can grind the long strip of alloy through the clamping plate as the rack plate reciprocates. By replacing 800# and 1500# sandpaper, grinding with different precisions can be performed to remove the oxide scale on the surface.

When the upper end of the diamond block swings to the right, it can push the pressing plate to move right and squeeze the limit block to slide down. When the pushing plate moves down with the limit block, one end of the polished tensile specimen can be fixed. At the same time, the hydraulic rod is driven to extend and push the pressing plate to move down, so as to fix the other end of the polished tensile specimen and achieve a rapid fixation of the metal specimen.

When the rack plate moves to the left, it can drive the gear rod to rotate clockwise and drive the cam to push the moving block to move to the right. At this time, the moving block can pull the polished tensile specimen for stretching. The tensile specimen is stretched to 6% deformation at room temperature and then unloaded. The purpose of performing different training times is to regulate its microstructure and optimize it to obtain a high-performance Ti-V-Al-Zr shape memory alloy with excellent mechanical properties and hardness.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a front structural schematic diagram of a mechanical training device for realizing high strength and high hardness of Ti-V-Al-Zr memory alloy proposed by the present invention;

FIG2 is a schematic diagram of the placement block structure of the mechanical training device for realizing high strength and high hardness of Ti-V-Al-Zr memory alloy proposed by the present invention;

FIG3 is a schematic diagram of the bump structure of the mechanical training device for realizing high strength and high hardness of Ti-V-Al-Zr memory alloy proposed by the present invention;

FIG4 is a schematic diagram of the structure of a grinding plate of a mechanical training device for realizing high strength and high hardness of Ti-V-Al-Zr memory alloy proposed by the present invention;

FIG5 is a graph showing mechanical training stress-strain curves of the Ti-V-Al-Zr shape memory alloy proposed in the present invention after 6% strain and different cycles;

FIG6 is a graph showing the influence of the number of mechanical training times on the microhardness of the Ti-V-Al-Zr shape memory alloy proposed by the present invention.

In the figure: 1 mounting plate, 2 first spring, 3 screw rod, 4 first transverse plate, 5 rack plate, 6 grinding plate, 7 fixed block, 8 second transverse plate, 9 second spring, 10 slide bar, 11 cam, 12 square plate, 13 third spring, 14 moving block, 15 L-shaped plate, 16 pressure plate, 17 cushion block, 18 push plate, 19 limit block, 20 pressing plate, 21 diamond block, 22 placement block, 23 protrusion, 24 fourth spring, 25 gear rod, 26 clamping plate.

Detailed ways

The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

1-6 , a mechanical training device for realizing high strength and high hardness of Ti-V-Al-Zr memory alloy includes a mounting plate 1 and a placement block 22 , wherein the placement block 22 is fixedly connected to one end of the mounting plate 1 , and a cushion block 17 is fixedly connected to the mounting plate 1 , and the cushion block 17 is arranged between the placement block 22 and the moving block 14 .

The placement block 22 is provided with a fixed component, which includes a pressing plate 20, a limit block 19, a pushing plate 18, a diamond block 21, and the limit block 19 is slidably connected to the placement block 22. The pushing plate 18 is fixedly connected to the lower end of the limit block 19. The diamond block 21 is rotatably connected to the placement block 22. The middle part of the diamond block 21 is rotatably connected to the placement block 22, so that the diamond block 21 can be driven to swing under the drive of an external servo motor. One end of the diamond block 21 is slidably connected to a support rod, the pressing plate 20 is slidably connected to the placement block 22, and the support rod is hinged to the pressing plate 20. The fixed component also includes a protrusion 23 and a fourth spring 24. The protrusion 23 is fixedly connected to the placement block 22. The pressing plate 20 is arranged in a right-angle trapezoid. The fourth spring 24 is fixedly connected between the protrusion 23 and the pushing plate 18. The fourth spring 24 is used to reset the pushing plate 18.

A tension component is installed at one end of the mounting plate 1 away from the placement block 22, and the tension component includes a moving block 14, a pressure plate 16, a cam 11, a fixed block 7, a gear rod 25, and a rack plate 5. The moving block 14 is slidably connected to the mounting plate 1, the fixed block 7 is fixedly connected to the mounting plate 1, the pressure plate 16 is slidably connected to the moving block 14, the moving block 14 is fixedly connected to an L-shaped plate 15, and the L-shaped plate 15 is fixedly connected to a hydraulic rod, one end of the hydraulic rod is fixedly connected to the pressure plate 16, and the extension of the hydraulic rod can push the pressure plate 16 downward to achieve the moving The metal sample in the block 14 is fixed, the gear rod 25 is rotatably connected to the fixed block 7, the cam 11 is fixedly connected to the gear rod 25, the rack plate 5 is slidably connected to the mounting plate 1, and is meshed with the gear rod 25, the rack plate 5 is L-shaped, and is slidably connected to one end of the diamond block 21, a first spring 2 is connected between the rack plate 5 and the mounting plate 1, the tension component also includes a square plate 12 and a third spring 13, the square plate 12 is fixedly connected to the mounting plate 1, and the third spring 13 is fixedly connected between the square plate 12 and the moving block 14.

A clamping plate 26 is slidably connected to the mounting plate 1, and the clamping plate 26 is fixedly connected to the rack plate 5. A grinding plate 6 is slidably connected to the lower end of the clamping plate 26. Different types of grinding plates 6 can slide into the clamping plate 26, so it is convenient to replace the grinding plate 6. One end of the mounting plate 1 is fixedly connected to the first cross plate 4, and the first cross plate 4 is threadedly connected with the screw 3. The mounting plate 1 is fixedly connected to the second cross plate 8, and the second cross plate 8 is slidably connected with a slide rod 10. A second spring 9 is fixedly connected between one end of the slide rod 10 and the second cross plate 8. Round blocks are respectively provided on the slide rod 10 and the screw rod 3. As the screw rod 3 rotates and moves to the right, the metal sample can be pushed to the right and clamped.

The mechanical training device realizes the mechanical training method of high strength and high hardness of Ti-V-Al-Zr memory alloy, comprising the following steps:

S1: Place the stretched strip after heat treatment between the two round blocks, and rotate the screw rod 3, the screw rod 3 moves to the right on the first horizontal plate 4, pushes the strip to move right and squeezes the slide bar 10 while stretching the second spring 9. At this time, place 400# sandpaper in the clamping plate 26, and the steel is on the upper side of the strip. Then connect the middle part of the diamond block 21 to the external servo motor, and drive the diamond block 21 to swing back and forth. As the lower end of the diamond block 21 swings to the left, it can push the rack plate 5 to move to the left. When the lower end of the diamond block 21 moves to the right and no longer has an extrusion force on the rack plate 5, the rack plate 5 resets and moves under the elastic force of the first spring 2, so that the rack plate 5 reciprocates. The grinding plate 6 can grind the long strip alloy through the clamping plate 26 as the rack plate 5 reciprocates. By replacing 800# and 1500# sandpaper, grinding with different precisions can be performed to remove the oxide scale on the surface;

S2: Place the polished tensile specimen between the mounting plate 1 and the moving block 14. When the upper end of the diamond block 21 swings to the right, the pressing plate 20 can be pushed to move right and squeeze the limit block 19 to slide down. When the push plate 18 moves down with the limit block 19, one end of the polished tensile specimen can be fixed. At the same time, the hydraulic rod is driven to extend and push the pressing plate 16 to move down, so as to fix the other end of the polished tensile specimen.

When the rack plate 5 moves to the left, S3 can drive the gear rod 25 to rotate clockwise, and drive the cam 11 to push the moving block 14 to move to the right. At this time, the moving block 14 can pull the polished tensile specimen for stretching. The tensile specimen is stretched to 6% deformation at room temperature and then unloaded. This process is carried out 5 times, 10 times and 25 times respectively. The different training times are to regulate its microstructure and optimize the high-performance Ti-V-Al-Zr shape memory alloy with excellent mechanical properties and hardness. The Ti-V-Al-Zr shape memory alloy tensile specimens with different training times are subjected to tensile tests and microhardness tests.

In the present invention, the stretched long strip after heat treatment is placed between the two round blocks, and the screw rod 3 is rotated. The screw rod 3 moves to the right on the first horizontal plate 4, pushing the long strip to move right and squeezing the sliding rod 10 while stretching the second spring 9. At this time, 400# sandpaper is placed in the clamping plate 26, and the steel is on the upper side of the long strip. Then, the middle part of the diamond block 21 is connected to the external servo motor, and the diamond block 21 is driven to swing back and forth. As the lower end of the diamond block 21 swings to the left, it can push the rack plate 5 to move to the left. When the lower end of the diamond block 21 moves to the right and no longer has an extrusion force on the rack plate 5, the rack plate 5 resets and moves under the elastic force of the first spring 2, realizing the reciprocating motion of the rack plate 5. The grinding plate 6 can realize the grinding of the long strip alloy through the clamping plate 26 as the rack plate 5 reciprocates. By replacing 800# and 1500# sandpaper, grinding with different precisions can be performed to remove the oxide scale on the surface.

The polished tensile specimen is placed between the mounting plate 1 and the moving block 14. When the upper end of the diamond block 21 swings to the right, the pressing plate 20 can be pushed to move right and squeeze the limit block 19 to slide down. When the push plate 18 moves down with the limit block 19, one end of the polished tensile specimen can be fixed. At the same time, the hydraulic rod is driven to extend and push the pressing plate 16 to move down, so as to fix the other end of the polished tensile specimen and quickly fix the sample.

When the rack plate 5 moves to the left, it can drive the gear rod 25 to rotate clockwise, and drive the cam 11 to push the moving block 14 to move to the right. At this time, the moving block 14 can pull the polished tensile specimen for stretching. The tensile specimen is stretched to 6% deformation at room temperature and then unloaded. This process is carried out 5 times, 10 times and 25 times respectively. The different training times are used to regulate its microstructure and optimize the high-performance Ti-V-Al-Zr shape memory alloy with excellent mechanical properties and hardness. The Ti-V-Al-Zr shape memory alloy tensile specimens with different training times are subjected to tensile experiments and microhardness tests.

As shown in Figure 5, the microhardness of the Ti-V-Al-Zr shape memory alloy increases monotonically with the increase in the number of mechanical training times. When the number of mechanical training times increases from 0 to 25 times, its microhardness continues to increase from 319.7 HV to 350.8 HV. The continuous increase in the microhardness of the Ti-V-Al-Zr shape memory alloy is due to the work hardening produced during the mechanical training process.

The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims (9)

1. The mechanical training device for realizing high strength and high hardness of the Ti-V-Al-Zr memory alloy comprises a mounting plate (1) and a placing block (22), and is characterized in that the placing block (22) is fixedly connected to one end of the mounting plate (1);

The device is characterized in that a fixing part is arranged on the placement block (22), the fixing part comprises a pressing plate (20), a limiting block (19), a pushing plate (18), a diamond-shaped block (21) and the limiting block (19) are in sliding connection with the placement block (22), the pushing plate (18) is fixedly connected to the lower end of the limiting block (19), the diamond-shaped block (21) is rotationally connected to the placement block (22), one end of the diamond-shaped block (21) is connected with a supporting rod in a sliding manner, the pressing plate (20) is in sliding connection with the placement block (22), and the supporting rod is hinged with the pressing plate (20);

The utility model discloses a rack board, including installation board (1), rack board (5), installation board (1), keep away from place the one end of piece (22) and install the pulling force part, pulling force part includes movable block (14), clamp plate (16), cam (11), fixed block (7), rack board (25), movable block (14) sliding connection is in on installation board (1), fixed block (7) fixed connection is in on installation board (1), clamp plate (16) sliding connection is in on movable block (14), rack board (25) swivelling joint is in on fixed block (7), cam (11) fixed connection is in on rack board (25), rack board (5) sliding connection is in on installation board (1), and with rack board (25) meshing connection, rack board (5) are L type setting, and with one of them sliding connection of diamond (21), rack board (5) with be connected with first spring (2) between installation board (1).

2. The mechanical training device for achieving high strength and high hardness of Ti-V-Al-Zr memory alloy according to claim 1, wherein said fixing means further comprises a bump (23), a fourth spring (24), said bump (23) being fixedly connected to said placing block (22), said fourth spring (24) being fixedly connected between said bump (23) and said pushing plate (18).

3. The mechanical training device for realizing high strength and high hardness of the Ti-V-Al-Zr memory alloy according to claim 1, wherein the tension component further comprises a square plate (12) and a third spring (13), the square plate (12) is fixedly connected to the mounting plate (1), and the third spring (13) is fixedly connected between the square plate (12) and the moving block (14).

4. The mechanical training device for realizing high strength and high hardness of the Ti-V-Al-Zr memory alloy according to claim 1, wherein an L-shaped plate (15) is fixedly connected to the moving block (14), a hydraulic rod is fixedly connected to the L-shaped plate (15), and one end of the hydraulic rod is fixedly connected with the pressing plate (16).

5. The mechanical training device for realizing high strength and high hardness of the Ti-V-Al-Zr memory alloy according to claim 1, wherein a clamping plate (26) is connected to the mounting plate (1) in a sliding manner, the clamping plate (26) is fixedly connected with the rack plate (5), and a polishing plate (6) is connected to the lower end of the clamping plate (26) in a sliding manner.

6. The mechanical training device for realizing high strength and high hardness of the Ti-V-Al-Zr memory alloy according to claim 1, wherein one end of the mounting plate (1) is fixedly connected with a first transverse plate (4), and a screw rod (3) is connected to the first transverse plate (4) in a threaded manner.

7. The mechanical training device for realizing high strength and high hardness of Ti-V-Al-Zr memory alloy according to claim 6, wherein a second transverse plate (8) is fixedly connected to the mounting plate (1), a sliding rod (10) is slidably connected to the second transverse plate (8), a second spring (9) is fixedly connected between one end of the sliding rod (10) and the second transverse plate (8), and round blocks are respectively arranged on the sliding rod (10) and the screw rod (3).

8. The mechanical training device for realizing high strength and high hardness of Ti-V-Al-Zr memory alloy according to claim 1, wherein a cushion block (17) is fixedly connected to the mounting plate (1), and the cushion block (17) is arranged between the placing block (22) and the moving block (14).

9. A mechanical training method for achieving high strength and high hardness of a Ti-V-Al-Zr memory alloy according to any one of claims 1-8, comprising the steps of:

S1: the method comprises the steps that a heat-treated stretching strip is placed between two round blocks, a lead screw (3) is rotated, the lead screw (3) moves rightwards on a first transverse plate (4), the strip is pushed to move rightwards and extrude a sliding rod (10), a second spring (9) is stretched, 400# sand paper is placed in a clamping plate (26) and is positioned on the upper side of the strip, then the middle part of a diamond-shaped block (21) is connected with an external servo motor, the diamond-shaped block (21) is driven to swing reciprocally, the rack plate (5) can be pushed to move leftwards when the lower end of the diamond-shaped block (21) swings leftwards, when the lower end of the diamond-shaped block (21) does not have extrusion force on the rack plate (5) any more, the rack plate (5) moves back under the elasticity of the first spring (2), the rack plate (5) moves reciprocally, polishing of strip alloy can be achieved when the clamping plate (26) moves reciprocally along with the rack plate (5), and the surface oxide skin of a strip alloy can be removed through polishing of 800# and 1500# of different precision;

s2: the polished tensile sample is placed between the mounting plate (1) and the moving block (14), when the upper end of the diamond-shaped block (21) swings rightwards, the pressing plate (20) can be pushed to move rightwards and the limiting block (19) is extruded to slide downwards, the pushing plate (18) is pushed to fix one end of the polished tensile sample along with the downward movement of the limiting block (19), and meanwhile, the hydraulic rod is driven to extend and push the pressing plate (16) to move downwards, so that the other end of the polished tensile sample is fixed;

s3: when the rack plate (5) moves leftwards, the rack bar (25) can be driven to rotate clockwise, the cam (11) is driven to push the moving block (14) to move rightwards, at the moment, the moving block (14) can pull the polished tensile sample to stretch, the tensile sample is stretched to 6% deformation under the room temperature condition, then the tensile sample is unloaded, the process is sequentially carried out for 5 times, 10 times and 25 times respectively, different training times are carried out for regulating and controlling microstructure thereof so as to optimize and obtain the high-performance Ti-V-Al-Zr shape memory alloy with excellent mechanical property and hardness, and the tensile test and microhardness test are carried out on the tensile sample of the Ti-V-Al-Zr shape memory alloy with different training times.