CN116694915B - A pulse magnetic field strengthening treatment method and device - Google Patents

Abstract

The invention relates to a pulse magnetic field strengthening treatment method and a device, wherein the device comprises a discharge control system, a punch assembly, an auxiliary positioning device and a driving mechanism; the punch assembly comprises a coil and a base, the coil is connected with the base through a guide rod, and the base is connected with a charge-discharge control system and is used for generating a pulse magnetic field; the coil on the guide rod generates instantaneous lorentz force to impact the main journal transition fillet under the action of the pulse magnetic field; the clamping assembly clamps the crankshaft, the driving mechanism actively rotates for a certain angle after the coil completes one-time impact strengthening, and the next strengthening preparation is completed.

Description

A pulse magnetic field strengthening treatment method and device

Technical Field

The invention relates to the technical field of metal surface strengthening equipment, and in particular to a pulse magnetic field strengthening treatment method and device.

Background technique

During the crankshaft production process, the fatigue resistance of the journal fillet transition area is reduced due to the high-temperature phase change-rapid cooling process that makes the original structure vulnerable to damage, uneven cooling that easily causes large internal stress, improper temperature control that easily generates harmful phases, and difficulty in deformation control. In order to improve the fatigue strength of the crankshaft, surface treatment methods are currently used to strengthen the crankshaft journal fillet transition area, so that the surface material produces residual compressive stress to offset part of the tensile stress during the working process, thereby achieving the purpose of increasing the crankshaft's fatigue resistance. At present, the surface strengthening technology for the crankshaft fillet can achieve the introduction of a residual compressive stress layer, and can be divided into phase change/modification strengthening and strain strengthening according to the strengthening mechanism.

Phase change/modification strengthening is to generate phase structure or hard particles with higher strength/hardness through material phase change or introduction of strengthening elements. The main strengthening methods for the transition part of crankshaft fillet are induction quenching, carburizing, nitriding, carbonitriding, etc. However, this strengthening process needs to undergo a high-temperature phase change-rapid cooling process. There are prominent problems such as the original structure (such as forging streamline structure) is easily damaged, uneven cooling causes large internal stress, improper temperature control easily generates harmful phases, and deformation control is difficult. Although surface quenching (such as induction, laser, electron beam quenching, etc.) helps to improve deformation, the high temperature-rapid cooling method is very likely to cause local stress concentration, low process control accuracy and other problems.

Strain hardening is to increase the yield strength through a certain plastic deformation at room temperature and introduce appropriate compressive stress. It mainly includes shot peening and rolling hardening. The high-temperature phase change-rapid cooling process makes the original structure vulnerable to damage, uneven cooling can easily cause large internal stress, improper temperature control can easily generate harmful phases, and deformation control is difficult. The use of shot peening technology has low efficiency and increased roughness, and rolling hardening technology has excessive pressure that leads to crankshaft deformation.

Summary of the invention

In view of the above-mentioned deficiencies in the prior art, the present invention provides a pulsed magnetic field strengthening treatment method and device, which continuously charges and discharges the coil through a charge and discharge control system, and utilizes a pulsed magnetic field to directly impact and strengthen the excessive fillet of the crankshaft without changing the original structure, having no high temperature process, changing the original roughness, and generating no pressure to cause deformation of the crankshaft.

The present invention provides a pulse magnetic field strengthening treatment method, which comprises the following steps:

S1. Configure a strengthening device, set a driving mechanism at one end of the crankshaft, the driving mechanism is used to drive the crankshaft to rotate, and the rotation center is the central axis of the journal to be strengthened, and a coil is set at the position of the journal to be strengthened, and the coil is electrically connected to the discharge control system;

S2, determine the rotation angle θ ₂ of the journal to be strengthened each time, and set the crankshaft rotation number N=0;

S3, the discharge control system discharges the coil, and the coil strengthens the journal;

S4, the driving mechanism drives the journal to be strengthened to rotate by an angle θ ₂ , and N=N+1;

S5. When N<360/θ ₂ , return to S3 to continue execution; otherwise, end the strengthening of the crankshaft journal.

Preferably, the method for determining the rotation angle _θ2 of the journal to be strengthened in step S2 comprises the following steps:

S21, according to the power balance equation and the voltage balance equation in the discharge enhancement process, the coil current i is obtained;

S22. Calculate the equivalent pulse magnetic pressure P when the coil is placed close to the strengthening surface according to the coil current i;

S23, using the unit pure radial motion equation and the crankshaft surface flow stress equation, calculate the crankshaft radial deformation depth ω ₀ (t) and deformation angle θ ₁ ;

S24. After one discharge strengthening, the rotation angle _θ2 of the journal to be strengthened is:

Where r is the crankshaft journal radius, ω ₀ (t) is the radial deformation depth of the crankshaft, and θ ₁ is the deformation angle.

Preferably, the method for calculating the coil current i in step S21 comprises the following steps:

S211. The power balance equation during discharge enhancement is:

The voltage balance equation is:

In equations ② and ③, Q is the charge stored in the capacitor. is the mechanical power required to change the geometric dimensions of the loop, t is the time, C is the capacitance of the energy storage capacitor, L is the equivalent inductance of the coil, R is the equivalent resistance, and i is the coil current;

S212. According to the power balance equation and voltage balance equation in the discharge enhancement process, the coil current i is obtained:

In the formula, t is time, C is the capacitance of the energy storage capacitor, L is the equivalent inductance of the coil, and R is the equivalent resistance.

Preferably, the method for calculating the equivalent pulse magnetic pressure P in step S22 comprises the following steps:

S221. Place the coil close to the enhanced surface, and the equivalent pulse magnetic pressure P is expressed as:

Where, _μ0 is the vacuum magnetic permeability, λ is the Nagaoka coefficient, T is the number of turns per unit length of the coil, and i is the coil current;

S222, Order The equivalent pulse magnetic pressure P is obtained as:

In the formula, t is time, C is the capacitance of the energy storage capacitor, L is the equivalent inductance of the coil, and R is the equivalent resistance.

Preferably, the method for calculating the crankshaft radial deformation depth ω ₀ (t) in step S23 comprises the following steps:

S231. Ignoring the bending moment, the unit's pure radial motion equation is:

Where N _θ is the circumferential force, σ _θ is the surface stress, γ is the crankshaft material density, r is the crankshaft journal radius, and h is the deformation thickness during strengthening;

S232. Take the crankshaft surface flow stress P _y :

Wherein, σ is the average value of σ ⁰ , σ ⁰ is the equivalent stress, k = 0.5exp[-l(2D)], D is the crankshaft journal diameter, and l is the length of the strengthened surface;

S233. According to the unit pure radial motion equation and the crankshaft surface flow stress P _y, we get:

Integrate the above equation ⑨, and from the initial condition Simplified calculation:

Where, _t1 is the discharge start time, _t3 is the discharge stop time;

When t = t ₁ , From the above formula ⑩, we can get:

S234. According to the simplified calculation of the above formulas ⑧⑨⑩, the crankshaft radial deformation depth ω ₀ (t) is:

In the above formula, _μ0 is the vacuum magnetic permeability, λ is the Nagaoka coefficient, T is the number of turns per unit length of the coil, γ is the density of the crankshaft material, h is the deformation thickness during strengthening, U is the coil voltage, C is the capacitance of the energy storage capacitor, R is the equivalent resistance,/> t is time.

Preferably, in step S23, the deformation angle _θ1 is:

Where ω ₀ (t) is the radial deformation depth of the crankshaft, and x is the surface deformation radius.

A pulse magnetic field strengthening treatment device, the device comprising:

A punch assembly, the punch assembly comprising a base, a guide rod is arranged on one side of the base, a first end of the guide rod is fixedly connected to the base, a second end of the guide rod is arranged with a coil, the coil is sleeved and fixed on the second end of the guide rod, and the coil faces the journal to be strengthened of the crankshaft;

The discharge control system is electrically connected to the coil and is used to energize the coil.

Preferably, an auxiliary positioning device is provided on the base, and the auxiliary positioning device comprises a positioning plate, a positioning groove is formed on the positioning plate, and the guide rod is arranged in the positioning groove.

Preferably, it also includes a driving mechanism for driving the crankshaft's journal to be strengthened to rotate around the central axis of the journal to be strengthened, the driving mechanism includes a driving motor, the output shaft of the driving motor is coaxially arranged with the connecting rod journal to be strengthened of the crankshaft, and a clamping assembly is arranged at the output end of the driving motor, and the clamping assembly is used to clamp the crankshaft.

Preferably, the clamping assembly comprises a support plate, the support plate is fixedly connected to the output shaft of the driving motor, and claws for clamping the crankshaft are arranged on the support plate.

Compared with the prior art, the pulse magnetic field strengthening treatment method and device provided by the present invention have the following beneficial effects:

1. The present invention uses magnetic field design to continuously impact the crankshaft transition fillet while the charge and discharge control system continuously charges and discharges the coil, with high efficiency and relatively stable effect. The crankshaft R angle strengthening can be quickly achieved, the processing efficiency is very high, and the process is reliable. Direct impact strengthening of the crankshaft transition fillet using a pulsed magnetic field will not change the metal surface material, can keep the structure unchanged, and will not reduce the surface roughness. During strengthening, the overall bending and deformation of the crankshaft will not occur due to excessive pressure, and the strengthening process is easy to control. Since there is no high-temperature process, the crankshaft material hardly undergoes structural changes, and the excellent structure formed by the original heat treatment or forging can be maintained.

2. The present invention consumes very little energy, and the process is basically carried out at room temperature, does not require high-temperature heating and protective atmosphere, and has almost no material loss; and very little energy is required to establish a pulsed magnetic field.

3. The present invention can achieve uniform strengthening and controllable stress: by adjusting the pulse magnetic field characteristics (frequency, intensity, number of times, direction, etc.), the depth of the strengthening layer can be controlled; and the low-frequency characteristics can effectively reduce micro stress.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of the overall structure of the present invention;

FIG2 is a schematic diagram of a coil of the present invention;

FIG3 is a schematic diagram of a three-jaw caliper of the present invention;

FIG4 is a schematic diagram of a use state of the present invention;

FIG5 is a schematic diagram of the strengthening position I of the crankshaft after rotating one angle according to the present invention;

FIG6 is a schematic diagram II of the strengthening position after the crankshaft rotates once;

FIG7 is a schematic diagram of the strengthening position of the crankshaft after one rotation angle of the present invention III;

FIG8 is a flow chart of the processing method of the present invention.

Description of reference numerals:

1. Discharge control system; 2. Punch assembly; 3. Auxiliary positioning device; 4. Clamping assembly; 5. Coil; 6. Guide rod; 7. Base.

Detailed ways

The specific implementation modes of the present invention are described in detail below in conjunction with Figures 1 to 8 , but it should be understood that the protection scope of the present invention is not limited by the specific implementation modes.

The present invention provides a pulse magnetic field strengthening treatment method, which comprises the following steps:

S1. Configure a strengthening device, set a driving mechanism at one end of the crankshaft, the driving mechanism is used to drive the crankshaft to rotate, and the rotation center is the central axis of the journal to be strengthened, and a coil 5 is set at the position of the journal to be strengthened, and the coil 5 is electrically connected to the discharge control system;

S2, determine the rotation angle θ ₂ of the journal to be strengthened each time, and set the crankshaft rotation number N=0;

S3, the discharge control system discharges the coil 5, and the coil 5 strengthens the journal;

S4, the driving mechanism drives the journal to be strengthened to rotate by an angle θ ₂ , and N=N+1;

S5. When N<360/θ ₂ , return to S3 to continue execution; otherwise, end the strengthening of the crankshaft journal.

Further, the method for determining the rotation angle _θ2 of the journal to be strengthened in step S2 comprises the following steps:

S21, according to the power balance equation and the voltage balance equation in the discharge enhancement process, the coil current i is obtained;

S22, calculating the equivalent pulse magnetic pressure P when the coil 5 is placed close to the strengthening surface according to the coil current i;

S23, using the unit pure radial motion equation and the crankshaft surface flow stress equation, calculate the crankshaft radial deformation depth ω ₀ (t) and deformation angle θ ₁ ;

S24. After one discharge strengthening, the rotation angle _θ2 of the journal to be strengthened is:

Where r is the crankshaft journal radius, ω ₀ (t) is the radial deformation depth of the crankshaft, and θ ₁ is the deformation angle.

Furthermore, the method for calculating the coil current i in step S21 includes the following steps:

S211. The power balance equation during discharge enhancement is:

The voltage balance equation is:

In equations ② and ③, Q is the charge stored in the capacitor. is the mechanical power required to change the geometric dimensions of the loop, t is the time, C is the capacitance of the energy storage capacitor, L is the equivalent inductance of the coil, R is the equivalent resistance, and i is the coil current;

S212, the first wave of the magnetic pressure pulse plays a major role in deformation. The equivalent inductance of the discharge circuit changes very little. Ignoring the change in equivalent inductance will not have a significant impact on the calculation accuracy. Therefore, the inductance change is not considered. According to the power balance equation and voltage balance equation in the discharge enhancement process, the coil current i is obtained:

In the formula, t is time, C is the capacitance of the energy storage capacitor, L is the equivalent inductance of the coil, and R is the equivalent resistance.

Furthermore, the method for calculating the equivalent pulse magnetic pressure P in step S22 includes the following steps:

S221. Place the coil close to the strengthening surface, and the equivalent pulse magnetic pressure P is expressed as:

In the formula, _μ0 is the vacuum magnetic permeability, λ is the Nagaoka coefficient (can be found in the table), T is the number of turns per unit length of the coil, and i is the coil current;

S222, Order The equivalent pulse magnetic pressure P is obtained as:

In the formula, t is time, C is the capacitance of the energy storage capacitor, L is the equivalent inductance of the coil, and R is the equivalent resistance.

Further, the calculation method of the crankshaft radial deformation depth ω ₀ (t) in step S23 includes the following steps:

S231. Ignoring the bending moment, the unit's pure radial motion equation is:

Where N _θ is the circumferential force, σ _θ is the surface stress, γ is the crankshaft material density, r is the crankshaft journal radius, and h is the deformation thickness during strengthening;

S232. Take the crankshaft surface flow stress P _y :

Wherein, σ is the average value of σ ⁰ , σ ⁰ is the equivalent stress, k = 0.5exp[-l(2D)], D is the crankshaft journal diameter, and l is the length of the strengthened surface;

S233. According to the unit pure radial motion equation and the crankshaft surface flow stress P _y, we get:

Integrate the above equation ⑨, and from the initial condition Simplified calculation:

Where, _t1 is the discharge start time, _t3 is the discharge stop time;

When t = t ₁ , From the above formula ⑩, we can get:

S234. According to the simplified calculation of the above formulas ⑧⑨⑩, the crankshaft radial deformation depth ω ₀ (t) is:

In the above formula, _μ0 is the vacuum magnetic permeability, λ is the Nagaoka coefficient (can be found in the table), T is the number of turns per unit length of the coil, γ is the density of the crankshaft material, h is the deformation thickness during strengthening, U is the coil voltage, C is the capacitance of the energy storage capacitor, R is the equivalent resistance,/> t is time.

As shown in FIG. 1 to FIG. 4 , the present invention provides a pulse magnetic field strengthening treatment device, which includes:

The punch assembly 2 includes a base 7, a guide rod 6 is disposed on one side of the base 7, a first end of the guide rod 6 is fixedly connected to the base 7, a second end of the guide rod 6 is disposed with a coil 5, the coil 5 is sleeved and fixed on the second end of the guide rod 6, and the coil 5 faces the journal to be strengthened of the crankshaft;

The discharge control system 1 is electrically connected to the coil 5 and is used to energize the coil 5 .

The coil 5 is used to generate a pulse magnetic field; the coil 5 on the guide rod 6 generates an instantaneous Lorentz force under the action of the pulse magnetic field to impact the transition radius of the main shaft neck.

Furthermore, an auxiliary positioning device 3 is provided on the base 7 , and the auxiliary positioning device 3 comprises a positioning plate, a positioning groove is formed on the positioning plate, and the guide rod 6 is arranged in the positioning groove.

The auxiliary positioning device 3 ensures that the coil 5 is located at the same position each time the strengthening starts, so that the entire journal R angle can be strengthened after several fixed times of pulse strengthening as the crankshaft rotates.

Furthermore, it also includes a driving mechanism for driving the crankshaft's to-be-strengthened journal to rotate around the central axis of the to-be-strengthened journal, the driving mechanism includes a driving motor, the output shaft 8 of the driving motor is coaxially arranged with the crankshaft's to-be-strengthened connecting rod journal, and the output end of the driving motor is provided with a clamping assembly 4, the clamping assembly 4 is used to clamp the crankshaft. The driving mechanism can actively rotate a certain angle after the coil completes one impact strengthening to complete the next strengthening preparation.

Furthermore, the clamping assembly 4 includes a support plate, which is fixedly connected to the output shaft 8 of the driving motor. The support plate is provided with claws for clamping the crankshaft, and the claws can be three-jaw calipers.

The output shaft 8 of the driving motor is always coaxial with the crankshaft to be strengthened. The position of the clamping assembly 4 on the support plate is determined according to the position of the clamping end of the crankshaft to be strengthened, so as to facilitate clamping, thereby ensuring that the crankshaft to be strengthened can rotate around its axis.

working principle

The present invention provides a pulse magnetic field strengthening treatment device. During operation, the charge and discharge control system charges the coil, so that the coil is charged to generate a pulse magnetic field, and the crankshaft generates an induced current and a magnetic field, which interacts with the instantaneous strong magnetic field of the coil to form an instantaneous magnetic field force, impacting the transition fillet of the crankshaft to be processed. In the working state, the coil will continuously impact the crankshaft and introduce a residual stress layer into the transition fillet of the crankshaft, thereby achieving the purpose of strengthening. After the coil completes the impact strengthening of a certain position of the transition fillet of the crankshaft, the drive mechanism rotates the crankshaft by a certain angle, and the charge and discharge control system charges the coil again, so that the next strengthening position corresponds to the coil, and the next impact strengthening process begins, until the strengthening of the transition fillet of the crankshaft to be processed is completed.

When the driving mechanism drives the crankshaft to rotate, if the crankshaft rotates too much each time, as shown in Figure 5, it will cause uneven impact strengthening at the crankshaft corners, resulting in large and small residual stresses, leading to stress relaxation and uneven surface strengthening, which will cause the match with the connecting rod to deteriorate, thereby increasing the vibration of the crankshaft connecting rod mechanism and reducing the service life of the crankshaft.

If the crankshaft rotation angle is too small, as shown in Figure 6, as the number of impacts increases, the width and depth of the plastic deformation area on the metal surface will continue to increase, and the surface roughness will continue to deteriorate; if the rotation angle is too small, the number of impacts will increase, reducing the service life of the impact rod coil and increasing the economic cost of strengthening.

The present invention makes the rotation angle more accurate through calculation, as shown in FIG7 , thereby improving the uniformity of the crankshaft fillet reinforcement and ensuring the reinforcement quality. While ensuring the reinforcement quality, the number of reinforcements is reduced, the service life of the coil is increased, and the cost is reduced.

The above disclosure is only a preferred specific embodiment of the present invention, but the embodiments of the present invention are not limited thereto, and any changes that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims (5)

1. A pulsed magnetic field enhancement method, comprising the steps of:

s1, configuring a strengthening device, wherein a driving mechanism is arranged at one end of a crankshaft, the driving mechanism is used for driving the crankshaft to rotate, the rotation center is a central shaft of a journal to be strengthened, a coil (5) is arranged at the position of the journal to be strengthened, and the coil (5) is electrically connected with a discharge control system;

S2, determining the rotation angle theta ₂ of the journal to be reinforced each time, and enabling the rotation times N=0 of the crankshaft;

S3, discharging the coil (5) by a discharge control system, and strengthening the journal by the coil (5);

s4, driving the shaft neck to be reinforced by a driving mechanism to rotate by an angle theta ₂, so that N=N+1;

S5, returning to S3 to continue execution when N is less than 360/theta ₂, otherwise, ending the reinforcement of the crankshaft journal;

The method for determining the rotation angle theta ₂ of the journal to be reinforced in the step S2 comprises the following steps:

s21, obtaining a coil current i according to a power balance equation and a voltage balance equation in a discharge strengthening process;

S22, calculating equivalent pulse magnetic pressure P when the coil (5) is placed close to the reinforced surface according to the coil current i;

s23, calculating radial deformation depth omega ₀ (t) and deformation angle theta ₁ of the crankshaft by using a pure radial motion equation of the unit and a flow stress equation of the surface of the crankshaft;

S24, after discharge strengthening is performed once, the rotation angle theta ₂ of the journal to be strengthened is as follows:

Wherein r is the radius of a crankshaft journal, omega ₀ (t) is the radial deformation depth of the crankshaft, and theta ₁ is the deformation angle;

The method for calculating the coil current i in step S21 includes the steps of:

S211, a power balance equation in the discharge strengthening process is as follows:

The voltage balance equation is:

In equations ② and ③, Q is the charge stored by the capacitor, For the mechanical power changing the geometric dimension of the loop, t is time, C is the capacitance of the energy storage capacitor, L is the equivalent inductance value of the coil, R is the equivalent resistance, and i is the coil current;

s212, obtaining coil current i according to a power balance equation and a voltage balance equation in the discharge strengthening process:

In the method, in the process of the invention, T is time, C is energy storage capacitor capacitance, L is coil equivalent inductance value, R is equivalent resistance;

the method for calculating the equivalent pulse magnetic pressure P in step S22 includes the steps of:

s221, placing the coil close to the strengthening surface, and expressing the equivalent pulse magnetic pressure P as:

Wherein mu ₀ is vacuum magnetic permeability, lambda is long-period coefficient, T is number of turns in unit length of the coil, and i is coil current;

S222, order The obtained equivalent pulse magnetic pressure P is:

P＝P₀e^-2βtsin²(ωt) ⑥

In the method, in the process of the invention, T is time, C is energy storage capacitor capacitance, L is coil equivalent inductance value, R is equivalent resistance;

The calculation method of the radial deformation depth omega ₀ (t) of the crankshaft in the step S23 comprises the following steps:

S231, ignoring bending moment, wherein the pure radial motion equation of the unit is as follows:

Where N _θ is the circumferential force, Sigma _θ is surface stress, gamma is crank shaft material density, r is crank shaft journal radius, h is strengthening middle deformation thickness;

s232, taking the flow stress P _y of the surface of the crankshaft:

In the method, in the process of the invention, Sigma ⁰ is the equivalent stress, k=0.5 exp < -l (2D) ], D is the crankshaft journal diameter, l is the strengthened surface length;

S233, obtaining according to a unit pure radial motion equation and a crankshaft surface flow stress P _y:

Integrating ⑨ above, from the initial condition And (3) simplifying calculation to obtain:

Wherein t ₁ is discharge start time, and t ₃ is discharge stop time;

When t=t ₁, From the above ⑩:

S234, simplifying calculation according to ⑧⑨⑩, wherein the radial deformation depth omega ₀ (t) of the crankshaft is as follows:

In the above-mentioned method, the step of, Mu ₀ is vacuum permeability, lambda is the coefficient of Length, T is the number of turns per unit length of the coil, gamma is the density of the crankshaft material, h is the thickness of deformation in strengthening, U is the coil voltage, C is the capacitance of the storage capacitor, R is the equivalent resistance,/>T is time;

in step S23, the deformation angle θ ₁ is:

where ω ₀ (t) is the radial deformation depth of the crankshaft and x is the deformation radius of the crankshaft surface.

2. A pulsed magnetic field enhancement processing apparatus that implements the pulsed magnetic field enhancement processing method of claim 1, comprising:

the punch assembly (2), the punch assembly (2) comprises a base (7), one side of the base (7) is provided with a guide rod (6), a first end of the guide rod (6) is fixedly connected with the base (7), a second end of the guide rod is provided with a coil (5), the coil (5) is sleeved and fixed at the second end of the guide rod (6), and the coil (5) faces towards a shaft neck to be reinforced of the crankshaft;

And the discharge control system (1) is electrically connected with the coil (5) and is used for controlling the on-off of the coil (5).

3. The pulsed magnetic field strengthening treatment device according to claim 2, characterized in that the base (7) is provided with an auxiliary positioning device (3), the auxiliary positioning device (3) comprises a positioning plate, a positioning groove is formed in the positioning plate, and the guide rod (6) is arranged in the positioning groove.

4. A pulsed magnetic field strengthening treatment device as claimed in claim 3, further comprising a drive mechanism for driving the journal to be strengthened of the crankshaft to rotate around the central axis of the journal to be strengthened, the drive mechanism comprising a drive motor, an output shaft (8) of the drive motor being arranged coaxially with the journal of the connecting rod to be strengthened of the crankshaft, the output end of the drive motor being provided with a clamping assembly (4), the clamping assembly (4) being for clamping the crankshaft.

5. The pulsed magnetic field intensification treatment device of claim 4, characterized in that the clamping assembly (4) comprises a support plate fixedly connected with an output shaft (8) of the drive motor, and a claw for clamping the crankshaft is provided on the support plate.