CN115896660A - Titanium alloy strengthening device and method in a pulsed magnetic field inner plane converging force system - Google Patents

Abstract

The application provides a titanium alloy strengthening device in a pulsed magnetic field inner plane convergence force system, the strengthening device includes: a circular solenoid, used to generate a uniform strong magnetic field; a transparent resin material, filled in the circular A cylinder with a closed bottom is formed around the solenoid; the aluminum tube is arranged in the cylinder and adhered to the inner wall of the cylinder; titanium alloy devices can be accommodated in the aluminum tube, and the There is a gap between the titanium alloy device and the aluminum tube; the projectile is arranged between the titanium alloy device and the aluminum tube; wherein, when the current flows through the circular solenoid, it will interact with the The excitation current generated in the aluminum tube interacts to form a surface magnetic pressure, and the surface magnetic pressure is transmitted to the surface of the titanium alloy device through the projectile, and impacts the titanium alloy device to achieve the effect of strengthening the surface of the titanium alloy device.

Description

Titanium alloy strengthening device and method in a plane converging force system in a pulsed magnetic field

technical field

The application belongs to the technical field of surface strengthening of metal materials, and in particular relates to a titanium alloy strengthening device and method in a pulsed magnetic field inner plane converging force system.

Background technique

Due to its corrosion resistance, high temperature resistance, and high strength, titanium alloys have been increasingly used in key parts such as aircraft bodies and engine compressors, and even play an important role as structural parts in missiles and rockets. Therefore, strengthening methods for improving the strength, hardness and other properties of these titanium alloy components are also extremely important. However, the traditional metal surface strengthening methods have certain shortcomings.

For example, the surface heat treatment technology has very strict requirements on the furnace temperature control and the atmosphere in the furnace. If the treatment is not done properly, the parts to be treated will be scrapped, causing multiple losses. Moreover, equipment such as cooling tanks are also matched with the furnace body, and the overall equipment is bulky and heavy.

Although shot peening has simple equipment and low cost, this method will cause damage and peeling on the surface of the processed device, and when processing thinner parts, the high-speed impact of a large number of projectiles on one side will cause deformation of the part and destroy the shape of the part.

Rolling treatment of metal is easy to cause its surface and interior to delaminate and fall off, and it is difficult to process slender rods, thin-walled pipes and even complex parts.

The pulsed magnetic field technology generates a powerful pulsed magnetic field through the instantaneous discharge of high voltage and low capacitance, so that the metal placed in the magnetic field generates an excitation current near the surface, that is, the skin effect. magnetic pressure. And the powerful magnetic field generated in this process can be transmitted to the atomic scale of the metal without contact between the two, causing dislocations to be generated inside and promoting the movement of dislocations, and even change the spin state of electrons outside the nucleus and Arrangement rules, etc.

Utilizing this principle, Cu, Al and its alloys, high-speed tool steel have been strengthened by pulsed magnetic field, and remarkable results have been achieved. If you want to increase the magnetic pressure acting on the metal surface, you need to make the excitation current generated inside the metal more concentrated on the metal surface. According to the calculation formula of the skin depth of the excitation current, the conductivity of the metal is the key to this depth. one of the parameters. However, the electrical conductivity of titanium alloy (taking Ti-6Al-4V as an example) is small, which is an order of magnitude different from that of Al and Cu, so the excitation current generated inside the titanium alloy in the magnetic field is relatively scattered, making the magnetic pressure on it not so useful.

In addition, when processing materials such as thin plates in such a strong magnetic field, it is easy to cause deformation of parts due to uneven force. Therefore, a reasonable method and device are needed to effectively strengthen titanium alloy devices.

Contents of the invention

In order to solve the above technical problems, in the first aspect, the present application provides a titanium alloy strengthening device in a pulsed magnetic field inner plane convergence force system, the strengthening device includes:

Circular solenoid for generating a uniform strong magnetic field;

A transparent resin material is filled around the circular solenoid to form a cylinder with a closed bottom;

An aluminum tube is arranged in the cylinder and bonded to the inner wall of the cylinder; wherein the aluminum tube is used to generate an excitation current to form a surface magnetic pressure; a titanium alloy device can be accommodated in the aluminum tube, There is a gap between the titanium alloy device and the aluminum tube;

A projectile, arranged between the titanium alloy device and the aluminum tube; wherein the projectile is used to transfer energy in the magnetic field to the surface of the titanium alloy device;

Wherein, when the current flows through the circular solenoid, it will interact with the excitation current generated in the aluminum tube to form a surface magnetic pressure, and the surface magnetic pressure is transmitted to the surface of the titanium alloy device through the projectile. The titanium alloy device is impacted to achieve the effect of strengthening the surface of the titanium alloy device.

Preferably, the upper end of the cylinder is open, and the strengthening device further includes:

The end cap is used to close the opening; wherein, the opening is used to take and place samples.

Preferably, the end cap is a movable end cap, and the end cap is made of insulating transparent resin material.

Preferably, the projectiles include projectiles made of non-conductive materials and projectiles made of weakly conductive materials.

Preferably, straight rods are reserved at both ends of the circular solenoid; wherein, the straight rods are axially parallel to the circular solenoid.

Preferably, the strengthening device further includes:

High-voltage pulse power supply equipment is connected to the straight rods at both ends of the circular solenoid, and the high-voltage pulse power supply equipment is used to generate high-voltage pulse current;

Wherein, when the current of the high-voltage pulse power supply equipment flows through the circular solenoid, it will interact with the excitation current generated in the aluminum tube to form a surface magnetic pressure, and the surface magnetic pressure passes through the aluminum tube and The projectiles filled between the titanium alloy devices are quickly transferred to the surface of the titanium alloy device, and impact the titanium alloy device to achieve the effect of strengthening the surface of the titanium alloy device.

In the second aspect, the present application also provides a titanium alloy strengthening method in a plane converging force system in a pulsed magnetic field, the strengthening method comprising:

Insert the titanium alloy device to be processed into the aluminum tube;

Fill the projectile to all the gaps between the titanium alloy device and the aluminum tube;

Connect the terminal of the high-voltage pulse power supply equipment with the straight rods at both ends of the circular solenoid;

Charge the capacitor in the high-voltage pulse power supply equipment, and after it reaches the preset voltage, turn on the high-voltage switch to discharge, and complete the pulse impact strengthening treatment.

Preferably, the strengthening method also includes:

According to the impact effect and the preset target, perform multiple or multiple voltage impacts on the device to be processed.

Beneficial technical effect of the application:

This application uses an aluminum tube as the energy generating device during the impact process, and uses a projectile as the energy transfer device during the impact process to quickly and efficiently transfer the magnetic field energy to the surface of the titanium alloy device to be treated, thereby achieving the effect of strengthening the surface of the titanium alloy; this application Applying for the use of aluminum tubes to impact the titanium alloy device in the middle position in the plane converging force system, which solves the problem that the titanium alloy device is easily deformed under unidirectional force; this application uses projectiles to squeeze the surface of the device, avoiding shot peening Device surface loss due to processing.

Description of drawings

Fig. 1 is a cross-sectional view of a titanium alloy strengthening device in a plane converging force system provided by an embodiment of the present application;

Fig. 2 is a schematic structural diagram of a titanium alloy strengthening device in a plane converging force system provided by an embodiment of the present application;

Fig. 3 is an overall schematic diagram of a titanium alloy strengthening device in a plane converging force system provided by an embodiment of the present application;

Among them: 1-projectile; 2-circular solenoid; 3-aluminum tube; 4-end cover; 5-transparent resin material; 6-titanium alloy gear device.

Detailed ways

This application proposes a titanium alloy strengthening device and method in a pulsed magnetic field inner plane converging force system, wherein the strengthening device includes: a circular solenoid for generating a uniform strong magnetic field; an aluminum tube for generating an excitation current , to form the surface magnetic pressure; the titanium alloy device is set at the center of the impact device; there is a gap between the titanium alloy device and the aluminum tube; the projectile is set between the titanium alloy device and the aluminum tube to transfer the energy in the magnetic field to the Titanium alloy device surface.

Wherein, the circular solenoid is filled with transparent resin material; the transparent resin material is used to fix, support, insulate and protect the solenoid. The lower end of the circular solenoid is closed, and the upper end uses a movable end cap for taking and placing samples. Both the closure and end cap materials use insulating transparent resin materials. The outer diameter of the aluminum tube should be equal to the inner diameter of the solenoid filled with transparent resin material, which can be closely fitted to ensure the uniformity of the force on the aluminum tube.

Further, the radial length of the aluminum tube should be less than or equal to the radial length inside the solenoid after wrapping the transparent resin material, so as to ensure the effectiveness of the magnetic field treatment. Projectiles should be made of non-conductive or weakly conductive materials, and the size should be small so as to fill all gaps and ensure the accuracy of device processing. Straight rods are reserved at both ends of the circular solenoid; wherein, the straight rods are axially parallel to the circular solenoid.

In a feasible implementation manner, the strengthening device further includes: high-voltage pulse power supply equipment; wherein, the high-voltage pulse power supply equipment is connected with straight rods at both ends of the circular solenoid for generating high-voltage pulse current; wherein, When the current of the high-voltage pulse power supply equipment flows through the circular solenoid, it will interact with the excitation current generated in the aluminum tube to form a surface magnetic pressure. The surface magnetic pressure is quickly transmitted to the coil through the projectile filled between the aluminum tube and the titanium alloy device. The surface of the titanium alloy is impacted to achieve the effect of strengthening the surface of the titanium alloy device.

This application uses an aluminum tube as the energy generating device during the impact process, and uses a projectile as the energy transfer device during the impact process to quickly and efficiently transfer the magnetic field energy to the surface of the titanium alloy device to be treated, thereby achieving the effect of strengthening the surface of the titanium alloy; this application Applying for the use of aluminum tubes to impact the titanium alloy device in the middle position in the plane converging force system, which solves the problem that the titanium alloy device is easily deformed under unidirectional force; this application uses projectiles to squeeze the surface of the device, avoiding shot peening Device surface loss due to processing.

The application is described in further detail in conjunction with accompanying drawings 1-3 and specific embodiments:

This application provides a titanium alloy strengthening device and method in a pulsed magnetic field inner plane converging force system. The method uses a high-voltage, low-capacitance discharge and low-inductance magnetization device to cooperate with aluminum tubes and projectiles to impact titanium alloy devices. To achieve the effect of its surface strengthening. The device consists of projectile 1; circular solenoid 2; aluminum tube 3; end cap 4; transparent resin material 5; titanium alloy gear device 6, the specific appearance of the device is shown in Figure 2.

In other embodiments of the present application, a method for strengthening titanium alloys in a plane converging force system within a pulsed magnetic field is provided, including the following steps:

(1) Insert the titanium alloy device to be processed into the aluminum tube;

(2) Fill the projectile to all the gaps between the titanium alloy device and the aluminum tube;

(3) Connect the terminal post of the high-voltage pulse power supply equipment with the straight rods at both ends of the circular solenoid, wherein the contact area between the two is required to be not less than the cross-sectional area of the solenoid;

(4) Charge the capacitor in the high-voltage pulse power supply equipment according to the preset processing requirements, turn on the high-voltage switch after it reaches the preset voltage, and discharge the circuit where the device is located to complete the pulse impact strengthening treatment. Shock effect and pre-set target The device to be processed is subjected to multiple or multi-voltage shocks.

Among them, according to the calculation formula of the skin depth, in order to concentrate the excitation current in the aluminum tube on the thinner near-surface layer, it is necessary to reduce the number of turns of the circular solenoid as much as possible and use a lower capacitance.

Furthermore, according to the calculation formula of the discharge energy, it can be seen that in order to increase the magnetic pressure between the circular solenoid and the aluminum tube and make the aluminum tube have a greater impact force, a larger discharge voltage is required. In order to reduce the heat energy loss generated by the circuit during the discharge process, it is necessary to choose a metal material with a larger cross-sectional area and better conductivity to wind the circular solenoid.

Wherein, the straight rod parts reserved at both ends of the circular solenoid should be parallel to its axial direction, so that the magnetic fields generated by the straight rod part and the circular solenoid part after electrification will not interfere with each other. The inner diameter of the solenoid filled with transparent resin material fits closely with the aluminum tube to ensure the uniformity of the force on the aluminum tube. The radial length inside the solenoid filled with the transparent resin material should be greater than or equal to the radial length of the aluminum tube to ensure the effectiveness of the magnetic field treatment. The round end cap equipped at the upper mouth of the device is to prevent the projectile from being squeezed and flying out during the impact. The circular solenoid is filled with transparent resin material, which can fix, support and insulate the solenoid after it solidifies and protect the solenoid during the discharge process.

The application can effectively solve the problem that the surface of the titanium alloy device is difficult to strengthen, and can adjust the power supply voltage and the number of impacts in time according to the treatment effect. The circular solenoid can provide a uniform and strong magnetic field for the aluminum tube, and the simultaneous radial impact of the aluminum tube can prevent the titanium alloy device from being deformed due to unidirectional force. The movable end cover at the upper end is more convenient for taking and placing samples, which effectively shortens the processing cycle of a single sample and significantly improves the efficiency.

In other embodiments of the present application, please refer to Figures 1-3, a specific implementation manner is:

1. Tooling preparation:

The solenoid contained in the device is a circular solenoid wound by a copper rod with a diameter of 10mm, its axial length is 170mm, and the outer diameter of the circular section is 120mm. 100mm parallel and axial straight rods are reserved at both ends of the solenoid for connecting external high-voltage pulse power supply equipment. The surrounding of the solenoid is filled with transparent resin material, the thickness is 20mm, the thickness of the lower end seal is 15mm, the upper end cap is movable, its diameter is 130mm, and the thickness is 15mm. The axial length of the aluminum tube nested in the solenoid is 155 mm, the outer diameter of the section is 90 mm, and the inner diameter is 80 mm.

It should be noted that in order to reduce the heat generated when the current passes through the circular solenoid, it is necessary to choose a metal material with good conductivity and make its cross-sectional area large enough. In addition, the selected transparent resin material should have sufficient strength after solidification to prevent the device from cracking or even breaking during impact. In order to make the excitation current generated in the aluminum tube large enough, the magnetic pressure between the solenoid and the aluminum tube is strong enough and the radial force of the aluminum tube is uniform, the outer wall of the aluminum tube and the inner diameter of the solenoid filled with transparent resin material must be tightly packed. fit. The projectile should be made of non-conductive or weakly conductive materials, such as carbon steel shot, glass shot, ceramic shot, plastic shot, etc., and the size of the projectile can be adjusted according to the processing requirements.

2. Implementation steps:

(1) Insert a titanium alloy device whose size is smaller than the inner space of the aluminum tube into the aluminum tube;

(2) Fill all the gaps between the aluminum tube and the titanium alloy device with the selected projectile;

(3) Cover the movable upper end cover to complete the sample assembly step;

(4) Connect the terminal of the high-voltage pulse power supply equipment with the straight rods drawn from both ends of the circular solenoid, and fasten the connection with bolts to ensure that the contact area between the two is larger than the cross-sectional area of the conductive rod ;

(5) Set the voltage to 8KV to charge the capacitor. After the charging is completed, turn on the high-voltage discharge switch to discharge the circuit. The discharge times and charging voltage can be adjusted according to the strengthening effect.

Claims (8)

1. A titanium alloy strengthening device in a planar intersection system within a pulsed magnetic field, the strengthening device comprising:

a circular solenoid for generating a uniform strong magnetic field;

transparent resin material filled around the circular solenoid to form one cylinder with closed bottom;

the aluminum pipe is arranged in the cylinder and is attached to the inner wall of the cylinder; the aluminum pipe is used for generating exciting current to form surface magnetic pressure; a titanium alloy device can be accommodated within the aluminum pipe with a gap left between the titanium alloy device and the aluminum pipe;

a shot disposed between the titanium alloy device and the aluminum tube; wherein the shot is used for transferring energy in a magnetic field to the surface of the titanium alloy device;

when current flows through the circular solenoid, the current interacts with excitation current generated in the aluminum tube to form surface layer magnetic pressure, and the surface layer magnetic pressure is transmitted to the surface of the titanium alloy device through the shot to impact the titanium alloy device so as to achieve the effect of strengthening the surface of the titanium alloy device.

2. The stiffening device of claim 1, wherein the cylinder is open at an upper end, the stiffening device further comprising:

an end cap for closing the opening; wherein the opening is used for taking and placing a sample.

3. The reinforcement apparatus of claim 2, wherein the end caps are removable end caps, and the end caps are made of an insulating transparent resin material.

4. The reinforcement device of claim 3, wherein the pellets comprise pellets of a non-conductive material and pellets of a weakly conductive material.

5. The reinforcement device according to claim 4, wherein a straight rod is reserved at two ends of the circular solenoid; wherein the straight rod is axially parallel to the circular solenoid.

6. The stiffening device of claim 5, further comprising:

the high-voltage pulse power supply equipment is connected with the straight rods at the two ends of the circular solenoid and is used for generating high-voltage pulse current;

when the current of the high-voltage pulse power supply equipment flows through the circular solenoid, the current can interact with the exciting current generated in the aluminum pipe to form surface magnetic pressure, and the surface magnetic pressure is quickly transmitted to the surface of the titanium alloy device through the shot filled between the aluminum pipe and the titanium alloy device to impact the titanium alloy device so as to achieve the effect of strengthening the surface of the titanium alloy device.

7. A method of strengthening a titanium alloy in a planar intersection system within a pulsed magnetic field, the method comprising:

inserting a titanium alloy device to be treated into an aluminum tube;

filling the shot into all gaps between the titanium alloy device and the aluminum pipe;

connecting binding posts of high-voltage pulse power supply equipment with straight rods at two ends of a circular solenoid;

and charging a capacitor in the high-voltage pulse power supply equipment, and switching on a high-voltage switch to discharge after the capacitor reaches a preset voltage to finish pulse impact strengthening treatment.

8. The reinforcement method of claim 7, further comprising:

and carrying out multiple times or multiple voltage impacts on the device to be processed according to the impact effect and the preset target.

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