Stainless steel surface texturing rolling process for torque buffer plate of hybrid vehicle transmission

Abstract

A stainless steel surface texturing rolling process for a torque buffer plate of a hybrid vehicle transmission; a stainless steel strip has a thickness of 2-10 mm and a width of 150-950 mm; a finished product has a thickness of 0.5-3.0 mm and a width of 140-940 mm. The rolling process comprises the following steps: S1, pre-deformation rolling; S2, first cleaning; S3, first annealing; S4, surface texturing rolling; S5, second cleaning; S6, second annealing; and S7, slitting and warehousing.

Description

Stainless steel surface roughening rolling process for torque buffer plates in hybrid vehicle transmissions Technical Field

[0001] This invention belongs to the field of stainless steel roughened surface production technology, and relates to a rolling process for a roughened surface of stainless steel for torque buffer plates of hybrid vehicle transmissions, and more particularly to a rolling process for a roughened surface of stainless steel plate for torque buffer plates of transmissions of hybrid vehicles. Background Technology

[0002] Hybrid electric vehicles cleverly combine an internal combustion engine and an electric motor, which work together to automatically switch power modes according to different driving conditions, thereby reducing fuel consumption. In congested urban traffic, where vehicles frequently start and stop, hybrid vehicles rely on the electric motor for propulsion, avoiding the internal combustion engine operating in its inefficient range. When the vehicle speed increases to high speeds, it automatically switches to internal combustion engine propulsion, ensuring power output while significantly optimizing fuel economy and effectively reducing fuel consumption. This dual-system drive mode not only reduces carbon emissions and environmental pollution but also reduces the frequency of internal combustion engine use, thereby reducing engine wear and extending engine life. This gives hybrid vehicles unique advantages in terms of environmental protection and durability.

[0003] The torque damper is a core component in the transmission of a hybrid vehicle. During normal operation, it transmits the output shaft torque to the input shaft via friction plates to ensure smooth operation. Under overload conditions, it limits torque transmission to prevent damage, and automatically resumes torque transmission after the load decreases, improving efficiency. The surface roughness parameters of the torque damper affect many key performance aspects, including determining torque adjustment accuracy, enhancing wear resistance, and extending lifespan. Good surface roughness parameters of the torque damper have a cushioning and shock absorption effect, affecting power transmission efficiency, stability, and accuracy. It is also related to wear durability and high-temperature stability. Appropriate parameters can reduce vibration and noise, and in emergencies, it can quickly cut off power transmission, improving safety.

[0004] The surface roughness parameter of torque buffer strips in automotive transmissions is crucial. During production, in the stainless steel rolling stage before stamping, it is essential to ensure that the roughening process produces a uniform and constant surface roughness of the stainless steel. This is key to guaranteeing the performance of the torque buffer strip and is of great significance to the stable operation of the automotive transmission. A search revealed that invention patent CN114433624B discloses a method for producing roughened stainless steel cold-rolled strips. This method achieves the roughened surface of the stainless steel through processes such as molten iron pretreatment, continuous casting, slab rolling, annealing and pickling of hardened steel coils, roughening and leveling of the steel coils, and tension leveling, cleaning, and slitting of the steel plates. The main process for achieving the roughened surface involves roughening the strip surface by leveling the strip surface after annealing and pickling the hardened steel coils. However, since the surface roughening is only achieved through a leveling process, the efficiency of transferring the roughness parameter from the roughening roller to the strip surface is low. Furthermore, the micro-deformation and chrome plating treatment alter the strip properties, which is detrimental to the subsequent stamping and forming of the torque buffer strip. Therefore, this method is not suitable for the application of torque buffer strips in transmissions.

[0005] Therefore, in order to ensure the constant surface roughness parameters of the torque buffer plate for automotive transmissions and to facilitate subsequent stamping processes, this invention provides a novel rolling process for roughened stainless steel plates used in torque buffer plates for hybrid electric vehicle transmissions. Summary of the Invention

[0006] In view of this, in order to solve the problems of existing stainless steel sheet surface roughening treatment methods that alter strip properties, are not conducive to subsequent torque buffer sheet stamping, and are unsuitable for gearbox torque buffer sheet applications, the present invention provides a stainless steel surface roughening rolling process for torque buffer sheets in hybrid vehicle gearboxes. This rolling process improves the surface roughness parameter accuracy of the finished stainless steel strip by pre-rolling deformation and smoothing, and asynchronous rolling to efficiently transfer the surface roughness of the roughening roller, thereby meeting the surface roughness parameter requirements of the torque buffer sheet.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A rolling process for a roughened stainless steel surface on a torque buffer plate for a hybrid vehicle transmission includes the following steps:

[0009] S1. Pre-deformation rolling: The stainless steel strip is rolled into a pre-deformed semi-finished product with a thickness of 1.5~4.6mm through multiple passes. The reduction per pass is 5%~40%, the rolling pressure is 200~1000t, the rolling speed is 50~400m / min, and a pair of work rolls are replaced for each pass.

[0010] S2. First cleaning: The pre-deformed semi-finished product is cleaned by alkaline washing and ultrasonic cleaning processes to remove rolling oil and fine particulate impurities from the strip surface, and to prevent surface oxidation during annealing and subsequent roughening rolling from affecting the uniformity of surface roughness.

[0011] S3, First annealing: The pre-deformed semi-finished product after cleaning is bright annealed in a full hydrogen atmosphere. Annealing softens the hard stainless steel by recrystallization, which is beneficial for the subsequent transfer of the surface roughness parameters of the texturing roller to the stainless steel surface.

[0012] S4. Textured Rolling: The annealed pre-deformed semi-finished product is subjected to multi-pass asynchronous texturing rolling to produce a finished strip with a thickness of 0.5~3.0mm. The single-pass reduction is 5%~40%, the rolling pressure is 50~1000t, the rolling speed is 40~300m / min, and the speed ratio is 1.05~1.2. During the rolling process, the strip on the winding side is padded with paper throughout the process. A pair of texturing work rolls are replaced for each pass, and the surface of the work rolls is texturized by electrical discharge texturing process.

[0013] When using asynchronous rolling, the frictional forces on the upper and lower surfaces of the stainless steel deformation zone are opposite, which is beneficial for the transfer of surface roughness parameters of the texturing roll. The padding paper throughout the process prevents friction between the strips caused by the high tension during rolling, which would damage the uniformity of the surface roughness parameters of the stainless steel. Replacing a pair of work rolls for each pass ensures high precision and stability of the texturing strip parameters.

[0014] S5. Second cleaning: Clean the finished strip material using alkaline washing and ultrasonic cleaning processes.

[0015] S6. Second annealing: The cleaned finished strip is subjected to bright annealing in a full hydrogen atmosphere to recrystallize the deformed stainless steel strip, which is beneficial for the subsequent stamping and forming of torque buffer sheets.

[0016] S7. Slitting and warehousing: The finished strip after annealing is trimmed and slited.

[0017] Furthermore, in step S1, the chemical composition of the stainless steel strip used for the torque buffer plate of the hybrid vehicle transmission, by mass percentage, includes: C: 0.05~1%, Si: 0.1~2%, Mn: 0.2~3%, P: 0.02~0.1%, S: 0.01~0.1%, Cr: 10~25%, with the remainder being Fe and other unavoidable impurities. The thickness of the stainless steel strip used for the torque buffer plate of the hybrid vehicle transmission is 2~10mm, and the width is 150~950mm.

[0018] Furthermore, the synchronous rolling equipment used in the pre-deformation rolling in step S1 is an HL-type six-roll reversible mill with a work roll diameter of 90~120mm and a work roll surface roughness of Ra 0.1~0.5μm.

[0019] During pre-rolling deformation, the low surface roughness makes the stainless steel strip surface smooth and does not affect the subsequent roughening rolling.

[0020] Furthermore, both the first cleaning in step S1 and the second cleaning in step S5 use a NaOH solution with an alkaline concentration of 20-30%, and the ultrasonic cleaning uses an ultrasonic frequency of 20KHz-60KHz and a cleaning speed of 30-150m / min.

[0021] Furthermore, in step S3, the temperature of the first annealing is 650~1100℃, and the yield strength of the pre-deformed semi-finished strip after annealing is 180~400MPa, the tensile strength is 270~600MPa, and the elongation is 14~45%.

[0022] Furthermore, in step S4, the asynchronous rolling equipment used for the texturing surface rolling is a four-roll reversible combined forming mill, with a texturing work roll diameter of 80~150mm, a surface roughness Ra of 2.0~6.0μm, Pc of 10~60, and Rsk of -0.5~0.8.

[0023] Furthermore, in step S4, the material of the texturing work roll in the texturing rolling process is high-speed steel, and its composition by mass percentage includes: C: 0.85-1.25%, Si: 0.10-0.85%, Mn: 0.09-0.50%, S: ≤0.030%, P: ≤0.030%, Cr: 3.50-4.25%, Mo: 8.00-11.00%, W: 1.10-2.15%, V: 0.75-1.50%, Co: 7.65-8.95%, with the balance being Fe. The surface hardness of the texturing work roll is HRC 65-67.

[0024] The electrical discharge texturing process can texturize the surface of work rolls with high hardness, and is not affected by the material of the work rolls. It can provide more precise work roll surface roughness and peak density, which is beneficial to the stability of the surface parameters of stainless steel strip during texturing rolling.

[0025] Furthermore, in step S4, the output power of the electrical discharge texturing machine tool used for the electrical discharge texturing work roll is 40-50%, the frequency is 4KHz-400KHz, the voltage is 800-1000V, the current is 3-5A, the pulse width is 10-80μs, and the gap between the electrode and the workpiece is 0.01-0.15mm.

[0026] Furthermore, in step S6, the temperature of the second annealing is 750~880℃, and the yield strength of the annealed finished strip is 205~250MPa, the tensile strength is 420~450MPa, and the elongation is 22~25%.

[0027] Furthermore, in step S7, the surface roughness Ra of the finished strip is 0.6~3.5μm, Pc is 10~90, and Rsk is -0.4~0.8, and the width of the slit finished strip is 140~940mm.

[0028] The beneficial effects of this invention are as follows:

[0029] 1. The stainless steel surface roughening rolling process for torque buffer plates of hybrid vehicle transmissions disclosed in this invention uses low-roughness work rolls for pre-rolling deformation to flatten the surface of the stainless steel strip, which is beneficial to the uniformity and stability of the stainless steel surface parameters in subsequent roughening rolling. Asynchronous rolling is performed using high-hardness roughening work rolls, where the frictional forces on the upper and lower surfaces of the stainless steel deformation zone are opposite. Furthermore, the mechanical property parameters of the stainless steel strip are controlled by the first annealing process, which enables the surface parameters of the work rolls to be efficiently transferred to the surface of the stainless steel strip, thereby improving the accuracy of the surface roughness parameters of the finished stainless steel strip.

[0030] 2. The stainless steel surface roughening rolling process for torque buffer plates in hybrid vehicle transmissions disclosed in this invention employs an electrical discharge machining (EDM) process to roughen the surface of the work rolls. This process can roughen the surface of work rolls with high hardness, is unaffected by the material of the work rolls, and can provide more precise work roll surface roughness and peak density, which is beneficial to the stability of the surface parameters of the stainless steel strip during roughening rolling. The rolls are replaced for each pass during roughening rolling, so that the roughness parameters transferred to the surface of the strip are stable, uniform, and highly accurate, meeting the surface roughness parameters required for torque buffer plates.

[0031] 3. The stainless steel surface roughening rolling process for the torque buffer plate of hybrid vehicle transmission disclosed in this invention adopts a two-pass alkaline washing and ultrasonic cleaning process to remove the influence of semi-finished products and fine impurity particles on the surface roughness of stainless steel strip. During roughening rolling, paper is used as padding on the winding side throughout the process to prevent friction between layers of stainless steel strip under the rolling tension on the winding side, which would cause changes in the surface roughness parameters of stainless steel.

[0032] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0033] To make the objectives, technical solutions, and advantages of the present invention clearer, the preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, wherein:

[0034] Figure 1 is a flowchart of the stainless steel surface roughening rolling process for the torque buffer plate of the hybrid vehicle transmission of the present invention;

[0035] Figure 2 shows the macroscopic surface of the work roll after electrical discharge texturing according to the present invention;

[0036] Figure 3 shows the macroscopic surface of the finished textured strip of the present invention;

[0037] Figure 4 shows the microscopic surface of the finished textured tape of the present invention;

[0038] Figure 5 shows the surface profile curve of the finished textured strip of the present invention as measured by a roughness tester. Detailed Implementation

[0039] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

[0040] The chemical composition of the stainless steel strip in the embodiments of this invention is as follows: C: 0.1%, Si: 0.7%, Mn: 0.8%, P: 0.02%, S: 0.01%, Cr: 16%, with the remainder being Fe and other unavoidable impurities;

[0041] The chemical composition of the texturized work rolls is as follows (mass fraction): C: 1.05–1.15%, Si: 0.15–0.65%, Mn: 0.15–0.40%, S: ≤0.030%, P: ≤0.030%, Cr: 3.50–4.25%, Mo: 9.00–10.00%, W: 1.15–1.85%, V: 0.95–1.35%, Co: 7.75–8.75%, with the balance being Fe. The surface hardness of the work rolls is HRC 65–67. Synchronous rolling is performed using an HL-type six-high reversible mill, and asynchronous rolling is performed using a four-high reversible combined forming mill. Example 1

[0042] Stainless steel strip with a specification of 5x468mm was selected and roughened by rolling, and the final product was a roughened stainless steel strip with a specification of 1.8x232mm.

[0043] As shown in Figure 1, its rolling process includes the following steps:

[0044] S1. Pre-deformation rolling: The raw material is rolled in three simultaneous passes to form a pre-deformed semi-finished product with a thickness of 2.6mm x 468mm. The reductions in the three passes are 20%, 20%, and 19%, respectively. The rolling pressures are 400t, 420t, and 420t, respectively, and the rolling speed is 120m / min for all three passes. The surface roughness of the work rolls in the first two passes is Ra0.3μm, and the surface roughness of the work rolls in the third pass is Ra0.2μm. The diameter of the work rolls in all three passes is 120mm.

[0045] S2. First cleaning: The pre-deformed semi-finished product is cleaned using a 30% NaOH solution for alkaline washing, a 50KHz ultrasonic cleaning frequency, and a cleaning speed of 80m / min.

[0046] S3. First annealing: The pre-deformed semi-finished product after cleaning is subjected to bright annealing in a full hydrogen atmosphere at a temperature of 930℃. The yield strength, tensile strength and elongation of the pre-deformed semi-finished strip after annealing are 220MPa, 398MPa, and 24%.

[0047] S4. Textured Rolling: The annealed pre-deformed semi-finished product is subjected to two passes of asynchronous textured rolling to produce a finished strip with a thickness of 1.8mm x 468mm. The reductions for the two passes are 15% and 18%, respectively, with rolling pressures of 240t and 260t, and rolling speeds of 70m / min and 65m / min, respectively. The speed ratios are 1.06 and 1.08, respectively. During the rolling process, the strip on the winding side is padded with paper throughout. Asynchronous rolling uses 90mm diameter work rolls. The surface of the work rolls is textured by an electrical discharge machining (EDM) process. The EDM textured process is as follows: machine output power 45%, frequency 200kHz, voltage 900V, current 4A, pulse width 60μs, and electrode-workpiece gap 0.01mm. The surface parameters of the textured work rolls are Ra 4.0μm, Pc 30, and Rsk 0.2. The macroscopic surface of the textured work rolls is shown in Figure 2.

[0048] S5. Second cleaning: The finished strip is cleaned using a 25% NaOH solution for alkaline washing, a 30kHz ultrasonic cleaning frequency, and a cleaning speed of 70m / min.

[0049] S6. Second annealing: The cleaned finished strip is subjected to bright annealing in a full hydrogen atmosphere at a temperature of 880℃. The yield strength, tensile strength and elongation of the finished strip after annealing are 230MPa, 430MPa and 24% respectively.

[0050] S7. Slitting and Warehousing: The annealed finished strip is slit into strips with a product specification of 1.8x232mm. The surface roughness parameters of the strip are Ra 1.8μm, Pc 30, and Rsk 0.2. The macroscopic surface of the finished strip is shown in Figure 3, the microscopic surface is shown in Figure 4, and the surface profile curve measured by a roughness tester is shown in Figure 5. Example 2

[0051] Stainless steel strip with a specification of 3x470mm was selected and roughened by rolling, and the final product was a roughened stainless steel strip with a specification of 1.2x234mm.

[0052] Its rolling process includes the following steps:

[0053] S1. Pre-deformation rolling: The raw material is rolled in two simultaneous passes to form a pre-deformed semi-finished product with a thickness of 2.0mm x 470mm. The reduction in the two passes is 20% and 17% respectively, the rolling pressure is 430t and 430t respectively, the rolling speed is 130m / min for both passes, the surface roughness of the work rolls in both passes is Ra0.2μm, and the diameter of the work rolls in both passes is 100mm.

[0054] S2. First cleaning: The pre-deformed semi-finished product is cleaned using a 25% NaOH solution for alkaline washing, a 60KHz ultrasonic cleaning frequency, and a cleaning speed of 70m / min.

[0055] S3. First annealing: The pre-deformed semi-finished product after cleaning is subjected to bright annealing in a full hydrogen atmosphere at a temperature of 890℃. The yield strength, tensile strength and elongation of the pre-deformed semi-finished strip after annealing are 210MPa, 395MPa, and 28%.

[0056] S4. Textured Surface Rolling: The annealed pre-deformed semi-finished product is subjected to three passes of asynchronous textured rolling to produce a finished strip with a thickness of 1.2mm x 470mm. The reduction amounts for the three passes are 20%, 15%, and 12%, respectively. The rolling pressures are 230t, 210t, and 190t, respectively, and the rolling speeds are 70m / min, 65m / min, and 65m / min, respectively, with speed ratios of 1.08, 1.05, and 1.05. During the rolling process, paper is used as a backing material on the winding side of the strip throughout. Asynchronous rolling uses 90mm diameter work rolls. The surface of the work rolls is textured using an electrical discharge machining (EDM) process. The EDM textured process is as follows: machine output power 48%, frequency 240kHz, voltage 880V, current 5A, pulse width 70μs, and electrode-workpiece gap 0.01mm. The surface parameters of the textured work rolls are Ra 4.2μm, Pc 35, and Rsk 0.4.

[0057] S5. Second cleaning: The finished strip is cleaned using a 25% NaOH solution for alkaline washing, a 25KHz ultrasonic cleaning frequency, and a cleaning speed of 65m / min.

[0058] S6. Second annealing: The cleaned finished strip is subjected to bright annealing in a full hydrogen atmosphere at a temperature of 830℃. The yield strength, tensile strength and elongation of the finished strip after annealing are 235MPa, 440MPa and 22% respectively.

[0059] S7. Slitting and Warehousing: The annealed finished strip is trimmed and slited into strips with a product specification of 1.2x234mm.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A rolling process for a roughened stainless steel surface on a torque buffer plate for a hybrid vehicle transmission, characterized in that, Includes the following steps: S1. Pre-deformation rolling: The stainless steel strip is rolled into a pre-deformed semi-finished product with a thickness of 1.5~4.6mm through multiple passes. The reduction per pass is 5%~40%, the rolling pressure is 200~1000t, the rolling speed is 50~400m / min, and a pair of work rolls are replaced for each pass. S2. First cleaning: The pre-deformed semi-finished product is cleaned by alkaline washing and ultrasonic cleaning processes to remove rolling oil and fine particulate impurities from the strip surface, and to prevent surface oxidation during annealing and subsequent roughening rolling from affecting the uniformity of surface roughness. S3, First annealing: The pre-deformed semi-finished product after cleaning is bright annealed in a full hydrogen atmosphere. Annealing softens the hard stainless steel by recrystallization, which is beneficial for the subsequent transfer of the surface roughness parameters of the texturing roller to the stainless steel surface. S4. Textured Rolling: The annealed pre-deformed semi-finished product is subjected to multi-pass asynchronous texturing rolling to produce a finished strip with a thickness of 0.5~3.0mm. The single-pass reduction is 5%~40%, the rolling pressure is 50~1000t, the rolling speed is 40~300m / min, and the speed ratio is 1.05~1.

2. During the rolling process, the strip on the winding side is padded with paper throughout the process. A pair of texturing work rolls are replaced for each pass, and the surface of the work rolls is texturized by electrical discharge texturing process. S5. Second cleaning: Clean the finished strip material using alkaline washing and ultrasonic cleaning processes. S6. Second annealing: The cleaned finished strip is subjected to bright annealing in a full hydrogen atmosphere to recrystallize the deformed stainless steel strip, which is beneficial for the subsequent stamping and forming of torque buffer sheets. S7. Slitting and warehousing: The finished strip after annealing is trimmed and slited.

2. The stainless steel surface roughening rolling process for torque buffer plates in hybrid vehicle transmissions as described in claim 1, characterized in that, The chemical composition of the stainless steel strip used for the torque buffer plate of the hybrid vehicle transmission in step S1, by mass percentage, includes: C: 0.05~1%, Si: 0.1~2%, Mn: 0.2~3%, P: 0.02~0.1%, S: 0.01~0.1%, Cr: 10~25%, with the remainder being Fe and other unavoidable impurities. The thickness of the stainless steel strip used for the torque buffer plate of the hybrid vehicle transmission is 2~10mm, and the width is 150~950mm.

3. The stainless steel surface roughening rolling process for torque buffer plates in hybrid vehicle transmissions as described in claim 1, characterized in that, In step S1, the synchronous rolling equipment used for pre-deformation rolling is an HL-type six-roll reversible mill with a work roll diameter of 90~120mm and a work roll surface roughness of Ra 0.1~0.5μm.

4. The stainless steel surface roughening rolling process for torque buffer plates in hybrid vehicle transmissions as described in claim 1, characterized in that, Both the first cleaning in step S1 and the second cleaning in step S5 use a NaOH solution with an alkaline concentration of 20-30%. The ultrasonic cleaning uses an ultrasonic frequency of 20KHz-60KHz and a cleaning speed of 30-150m / min.

5. The stainless steel surface roughening rolling process for torque buffer plates in hybrid vehicle transmissions as described in claim 4, characterized in that, In step S3, the temperature of the first annealing is 650~1100℃, and the yield strength of the pre-deformed semi-finished strip after annealing is 180~400MPa, the tensile strength is 270~600MPa, and the elongation is 14~45%.

6. The stainless steel surface roughening rolling process for torque buffer plates in hybrid vehicle transmissions as described in claim 1, characterized in that, In step S4, the asynchronous rolling equipment used for texturing the surface is a four-roll reversible combined forming mill. The diameter of the texturing work roll is 80~150mm, and the surface roughness Ra is 2.0~6.0μm, Pc is 10~60, and Rsk is -0.5~0.

8.

7. The stainless steel surface roughening rolling process for torque buffer plates in hybrid vehicle transmissions as described in claim 6, characterized in that, In step S4, the material of the texturing work roll in the texturing rolling process is high-speed steel, and its composition by mass percentage includes: C: 0.85-1.25%, Si: 0.10-0.85%, Mn: 0.09-0.50%, S: ≤0.030%, P: ≤0.030%, Cr: 3.50-4.25%, Mo: 8.00-11.00%, W: 1.10-2.15%, V: 0.75-1.50%, Co: 7.65-8.95%, with the balance being Fe. The surface hardness of the texturing work roll is HRC 65-67.

8. The stainless steel surface roughening rolling process for torque buffer plates in hybrid vehicle transmissions as described in claim 7, characterized in that, In step S4, the output power of the EDM texturing machine tool used for the EDM texturing work roll is 40-50%, the frequency is 4KHz-400KHz, the voltage is 800-1000V, the current is 3-5A, the pulse width is 10-80μs, and the gap between the electrode and the workpiece is 0.01-0.15mm.

9. The stainless steel surface roughening rolling process for torque buffer plates in hybrid vehicle transmissions as described in claim 1, characterized in that, In step S6, the temperature for the second annealing is 750~880℃, and the yield strength of the finished strip after annealing is 205~250MPa, the tensile strength is 420~450MPa, and the elongation is 22~25%.

10. The stainless steel surface roughening rolling process for torque buffer plates in hybrid vehicle transmissions as described in claim 9, characterized in that, In step S7, the surface roughness Ra of the finished strip is 0.6~3.5μm, Pc is 10~90, and Rsk is -0.4~0.8, and the width of the finished strip after slitting is 140~940mm.

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