Surface polishing treatment method for cold-formed section steel

Abstract

The invention relates to the technical field of steel treatment, and particularly discloses a cold-formed section steel surface polishing treatment method which is used for solving the problems of poor polishing efficiency and poor polishing quality in the prior art. Comprising the following steps that pretreatment is conducted, specifically, profile steel A is placed on a conveying assembly to be conveyed, then the profile steel A stays at the position of a pretreatment assembly, a soaking treatment area is constructed at the moment, and pretreatment liquid is fed into the soaking treatment area through a liquid supply mechanism; and self-adaptive mechanical rough polishing is conducted, specifically, the profile steel A is transferred to the position of a material spraying treatment assembly, the outer side of the profile steel A is evenly treated through the material spraying treatment assembly, and dead-corner-free spraying treatment is achieved in cooperation with conveying of a conveying assembly. According to the invention, a streamlined processing mode for the profile steel A is designed and constructed according to the existing requirements, and the profile steel A can be subjected to pretreatment, self-adaptive mechanical rough polishing, catalytic chemical fine polishing and ultrasonic-assisted passivation treatment, so that the surface quality of the profile steel is greatly improved, and the processing quality is also ensured by streamlined processing.

Description

Technical Field

[0001] The invention relates to the technical field of steel material processing, in particular to a surface polishing method for cold-bent steel. Background Art

[0002] Cold-bent steel is prone to surface defects such as scale, burrs, scratches, and residual stress during processing. Traditional polishing methods have the following pain points: Mechanical polishing (grinding wheel / sandpaper): low efficiency and easy to cause surface damage; Chemical polishing: serious acid pollution and difficult to control corrosion to high-strength steel (such as Q345); Electrochemical polishing: high equipment cost and not suitable for continuous production of large-size steel. The existing patent with authorization announcement number CN117300871B discloses a special-shaped steel pipe polishing device, which can push the special-shaped steel pipe to move through moving parts, so that the polishing parts can polish the end of the special-shaped steel pipe, thereby improving the polishing efficiency of the special-shaped steel pipe. However, this purely mechanical polishing method has the problem of poor polishing effect, poor polishing continuity, and is not suitable for polishing large-volume steel.

[0003] Based on this, a method for surface polishing of cold-bent steel is now provided, which can eliminate the disadvantages of the existing device. Summary of the invention

[0004] The purpose of the present invention is to provide a cold-bent steel surface polishing treatment method, which solves the problems of poor polishing efficiency and poor polishing quality in the prior art.

[0005] To achieve the above object, the present invention provides the following technical solutions: A processing device in a cold-bent steel surface polishing processing method includes a transmission component for transmitting steel A, on which a pretreatment component for preliminary treatment of steel A, a spraying component for mechanical polishing of steel A, a catalytic fine polishing component for fine treatment of steel A, and a passivation component for final passivation of the surface of steel A are sequentially arranged, and the end of the transmission component is connected to a drying component.

[0006] On the basis of the above technical solution, the present invention also provides the following optional technical solution: In an optional scheme: the spray processing component includes a fixed outer ring which is sleeved on the outside of the transmission path of the steel section A, a rotating inner ring is rotatably provided on the inner side of the fixed outer ring, a plurality of spray heads are connected to the inner side of the rotating inner ring, the air inlet end of the fixed outer ring is connected to the spray pump through a feed pipe, a suction pipe is provided at the suction end of the spray pump, the lower end of the suction pipe extends into the spray material box, and the pipeline axis of the spray head is set at an acute angle to the cross-section of the rotating inner ring.

[0007] In an optional scheme: the pretreatment component, catalytic polishing component and passivation treatment component all include two parallelly arranged blocking baffles, the blocking baffles are arranged in the transmission gap of the transmission component, the inner wall of the transmission frame is provided with a guide slide groove matching the blocking baffles, the two blocking baffles are connected by a connecting crossbeam, the center position of the connecting crossbeam is connected to the driving cross bar, the other end of the driving cross bar is connected to the output end of the lifting push rod, the lifting push rod is installed on the outside of the transmission frame, the bottom of the transmission frame is provided with a docking groove matching the bottom of the blocking baffle, so that the blocking baffle isolates the inside of the transmission frame into an immersion treatment area, and the inside of the transmission frame is provided with a liquid supply mechanism for replenishing liquid into the immersion treatment area.

[0008] In an optional scheme: the liquid supply mechanism includes a liquid storage tank for storing liquid, a liquid supply pump is provided on the liquid storage tank, the liquid suction end of the liquid supply pump extends into the interior of the liquid storage tank, the liquid outlet end of the liquid supply pump is connected with a liquid supply pipe, the upper end of the liquid supply pipe passes through the transmission frame and is connected with the immersion treatment area, the bottom of the transmission frame where the immersion treatment area is located is also provided with a liquid return port, the liquid return port is connected with the liquid storage tank through a reflux pipe, and a solenoid valve is provided on the reflux pipe.

[0009] In an optional solution: the transmission component includes a transmission frame, the cross-section of the transmission frame is a U-shaped long strip structure, and a plurality of transmission rollers for supporting the steel section A are horizontally arranged inside the transmission frame. The plurality of transmission rollers constitute a transmission surface for transferring the steel section A, and the transmission rollers are connected to a transmission drive mechanism for driving the transmission rollers to rotate.

[0010] In an optional scheme: the transmission drive mechanism includes a transmission wheel arranged on the outside of the transmission frame, the transmission wheel is connected to the transmission roller through a transmission shaft, and multiple transmission wheels are connected through a transmission belt transmission. A tensioning wheel is rotatably arranged between adjacent transmission wheels, and one end of one transmission roller is connected to a driving motor for driving its rotation. The driving motor is installed on the outside of the transmission frame, and one of the transmission rollers is driven to rotate by the driving motor, and the transmission roller drives the transmission wheel to rotate. The transmission wheel drives multiple transmission wheels to rotate through the transmission belt, thereby providing power for the synchronous rotation of the transmission rollers.

[0011] In an optional solution: a collecting port and a collecting bucket are provided at the bottom of the transmission frame where the spray processing assembly is located, so as to collect the waste materials.

[0012] The solution is as follows: Step 1: Pretreatment: Place the steel A on the transmission component for transmission, and then keep the steel A at the pretreatment component position. At this time, an immersion treatment area is constructed, and the pretreatment liquid is fed into the immersion treatment area through the liquid supply mechanism. The formula of the pretreatment liquid is: sodium hydroxide 50g / L + sodium carbonate 30g / L + surfactant (OP-10) 5g / L, temperature: 60-70℃, time: 5-10 minutes; with the help of ultrasonic waves with a frequency of 40kHz, remove oil stains and loose oxide scale to provide a clean surface for subsequent polishing; Step 2: Adaptive mechanical rough polishing: transfer the steel A, evenly treat the outer side of the steel A through the spraying treatment component, and cooperate with the transmission of the transmission component to achieve spraying treatment without dead angles; Granular material: Silicon carbide (80-120 mesh) is mixed with polyurethane elastomer to make a flexible grinding block that can fit complex cross-sections, and the pressure is controlled at 0.3-0.5MPa; Silicon carbide abrasive: 80-120 mesh is medium-coarse particle size, providing cutting ability, mainly used to remove deeper defects such as surface oxide scale, burrs, welding slag, etc.

[0013] Step 3: Catalytic chemical polishing, transfer steel A to the catalytic polishing assembly position, construct an immersion treatment area, and feed low-concentration acid solution and corrosion inhibitor into the immersion treatment area through the liquid supply mechanism, specifically 150mL of phosphoric acid (85%) + 50mL of sulfuric acid (98%) + 20g of sodium nitrate + 10g of hexamethylenetetramine + water to 1L, temperature: 45-55℃, time: 3-5 minutes, with megasonic vibration (frequency 1-3MHz) to accelerate solution penetration; Step 4: Ultrasonic assisted passivation, transfer the steel A to the position of the passivation treatment component, then construct an immersion treatment area, and feed the passivation solution into the immersion treatment area through the liquid supply mechanism. The formula of the passivation solution is: 2% γ-aminopropyltriethoxysilane (KH550) + 50% ethanol + 48% deionized water, and the pH is adjusted to 4.5 (acetic acid); Temperature: room temperature, time: 2-3 minutes, the steel is immersed in the passivation solution, and ultrasonic waves (frequency 20kHz) are applied to break bubbles and form a uniform silane film.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention is designed according to existing needs and constructs a flow-type processing method for steel A, which can perform pretreatment, adaptive mechanical rough polishing, catalytic chemical fine polishing and ultrasonic-assisted passivation treatment on steel A, thereby greatly improving the surface quality of the steel, and the flow-type processing also ensures the processing quality.

[0015] 2. During mechanical polishing, the abrasive particles of the present invention are wrapped by polyurethane, and the cutting force of the abrasive particles is evenly released through elastic deformation during grinding, thereby reducing the risk of scratching the surface of the steel.

[0016] 3. The present invention can horizontally roll and transfer the steel section A, thereby avoiding the problem of processing dead angles caused by traditional clamping and ensuring the processing quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a process flow chart of the present invention.

[0018] Figure 2 It is a schematic diagram of the structure of one side of the present invention.

[0019] Figure 3 It is a structural schematic diagram of another side of the present invention.

[0020] Figure 4 It is a schematic diagram of the structure of the spray processing component of the present invention.

[0021] Figure 5 It is a schematic diagram of the guide chute structure in the present invention.

[0022] Reference numerals: transmission frame 100, transmission belt 101, transmission wheel 102, transmission roller 103, driving motor 104, tension wheel 105; Spraying treatment component 500, passivation treatment component 400, catalytic polishing component 300, pretreatment component 200; Connecting crossbeam 401, driving crossbar 402, blocking partition 403, lifting push rod 404, reflux pipe 405, liquid storage tank 406, liquid supply pump 407, liquid supply pipe 408, guide chute 409, steel A410; Spray paint box 501 , suction pipe 502 , spray pump 503 , feed pipe 504 , spray head 505 , fixed outer ring 506 , rotating inner ring 507 . DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] like Figure 1-Figure 5As shown, an embodiment of the present invention provides a polishing treatment device in a cold-bent steel surface polishing treatment method, including a transmission component for transmitting the steel A410, the transmission component is sequentially provided with a pretreatment component 200 for preliminary treatment of the steel A410, a spray treatment component 500 for mechanical polishing of the steel A410, a catalytic fine polishing component 300 for fine treatment of the steel A410, and a passivation treatment component 400 for final passivation treatment of the surface of the steel A410, the end of the transmission component is connected to a drying component, and after treatment, the surface of the steel A410 is dried by the drying component; The spraying treatment assembly 500 includes a fixed outer ring 506 sleeved on the outside of the transmission path of the steel A410, a rotating inner ring 507 is rotatably provided inside the fixed outer ring 506, and a plurality of spray heads 505 are connected inside the rotating inner ring 507. The air inlet end of the fixed outer ring 506 is connected to the spraying pump 503 through a feed pipe 504, and a suction pipe 502 is provided at the suction end of the spraying pump 503. The lower end of the suction pipe 502 extends into the spray material box 501, so that The granular material in the spray material box 501 is fed into the fixed outer ring 506 through the suction pipe 502, and then the high-pressure gas mixed with the granules is sprayed out along the nozzle 505, so as to polish the surface of the steel A410. The pipeline axis of the nozzle 505 is set at an acute angle with the section of the rotating inner ring 507, so that the reaction force generated by the spray of the nozzle 505 will construct a rotational torque, so that the rotating inner ring 507 rotates rapidly, so as to spray the outer side of the steel A410 without dead angles; The pretreatment component 200, the catalytic polishing component 300 and the passivation treatment component 400 all include two parallel blocking baffles 403, the blocking baffles 403 are arranged in the transmission gap of the transmission component, the inner wall of the transmission frame 100 is provided with a guide slide groove 409 matching the blocking baffles 403, the two blocking baffles 403 are connected by a connecting crossbeam 401, the center position of the connecting crossbeam 401 is connected to the driving crossbar 402, the other end of the driving crossbar 402 is connected to the output end of the lifting push rod 404, the lifting push rod 404 is installed on the outside of the transmission frame 100, and the lifting push rod 404 is driven by the driving crossbar 402. The driving cross bar 402 is driven to move downward, and the driving cross bar 402 drives the two blocking baffles 403 to move downward along the guide slide groove 409 through the connecting cross beam 401. The bottom of the transmission frame 100 is provided with a docking groove matching the bottom of the blocking baffle 403, so that the blocking baffle 403 can isolate the inside of the transmission frame 100 into an immersion treatment area, so that the treatment liquid can immerse the steel A410. The transmission frame 100 is provided with a liquid supply mechanism for replenishing liquid in the immersion treatment area. The target liquid can be added to the immersion treatment area through the liquid supply mechanism, thereby realizing the treatment operation of the steel A410 at different stages; The liquid supply mechanism includes a liquid storage tank 406 for storing liquid, and a liquid supply pump 407 is provided on the liquid storage tank 406. The liquid suction end of the liquid supply pump 407 extends into the liquid storage tank 406, and the liquid outlet end of the liquid supply pump 407 is connected with a liquid supply pipe 408. The upper end of the liquid supply pipe 408 passes through the transmission frame 100 and is connected with the immersion treatment area. The bottom of the transmission frame 100 where the immersion treatment area is located is also provided with a liquid return port, which is connected with the liquid storage tank 406 through a reflux pipe 405. The reflux pipe 405 is provided with a solenoid valve, so that after a single treatment, the solenoid valve can be opened to return the liquid to the liquid storage tank 406. After the liquid is recovered, the blocking partition 403 can be lifted up, so that the steel A410 can be smoothly transferred to the next stage; The transmission assembly includes a transmission frame 100, the cross section of the transmission frame 100 is a U-shaped strip structure, a plurality of transmission rollers 103 for supporting the steel A410 are horizontally arranged inside the transmission frame 100, and the plurality of transmission rollers 103 constitute a transmission surface for transferring the steel A410, and the transmission rollers 103 are connected to a transmission driving mechanism for driving the transmission rollers 103 to rotate, and under the action of the transmission driving mechanism, the plurality of transmission rollers 103 rotate synchronously, thereby providing power for the transmission of the steel A410, and the transmission mode here makes the surface treatment of the steel A410 free from the problem of clamping dead angle, thereby ensuring the processing quality; The transmission drive mechanism includes a transmission wheel 102 arranged on the outside of the transmission frame 100, the transmission wheel 102 is connected to the transmission roller 103 through a transmission shaft, and multiple transmission wheels 102 are connected through a transmission belt 101. A tensioning wheel 105 is rotatably arranged between adjacent transmission wheels 102, and the tensioning wheel 105 presses down the upper side of the transmission belt 101 to ensure smooth transmission between the transmission wheel 102 and the transmission belt 101. One end of one of the transmission rollers 103 is connected to a driving motor 104 for driving the transmission roller 103 to rotate. The driving motor 104 is installed on the outside of the transmission frame 100, and one of the transmission rollers 103 is driven to rotate by the driving motor 104, and the transmission roller 103 drives the transmission wheel 102 to rotate. The transmission wheel 102 drives multiple transmission wheels 102 to rotate through the transmission belt 101, thereby providing power for the synchronous rotation of the transmission rollers 103. The specific treatment method includes the following steps: pretreatment → adaptive mechanical rough polishing → catalytic chemical fine polishing → ultrasonic assisted passivation; Step 1: Pretreatment: Place the steel A410 on the transmission component for transmission, and then keep the steel A410 at the position of the pretreatment component 200. At this time, an immersion treatment area is constructed, and the pretreatment liquid is fed into the immersion treatment area through the liquid supply mechanism. The formula of the pretreatment liquid is: sodium hydroxide 50g / L + sodium carbonate 30g / L + surfactant (OP-10) 5g / L, temperature: 60-70℃, time: 5-10 minutes; with the help of ultrasonic waves with a frequency of 40kHz, remove oil stains and loose oxide scale to provide a clean surface for subsequent polishing; Step 2: Adaptive mechanical rough polishing: transfer the steel A410, and evenly treat the outer side of the steel A410 through the spraying treatment component 500, and cooperate with the transmission of the transmission component to achieve spraying treatment without dead angles; Granular material: Silicon carbide (80-120 mesh) is mixed with polyurethane elastomer to make a flexible grinding block that can fit complex cross-sections, and the pressure is controlled at 0.3-0.5MPa; Silicon carbide abrasive: 80-120 mesh is medium-coarse particle size, providing cutting ability, mainly used to remove deeper defects such as surface oxide scale, burrs, welding slag, etc.

[0025] Polyurethane elastomer: As a flexible matrix, it has high elasticity, wear resistance and corrosion resistance. Its hardness is usually Shore A50-A80, and its hardness can be controlled by adjusting the formula.

[0026] Flexible fit: Polyurethane elastomer enables the grinding block to adapt to the complex cross-sections of cold-bent steel (such as round, rectangular, and special-shaped tubes), avoiding the stress concentration problem of the corners of rigid molds.

[0027] Elastic grinding: The abrasive particles are wrapped in polyurethane, and the cutting force of the abrasive particles is evenly released through elastic deformation during grinding, reducing the risk of scratching the surface of the steel; Step 3: Catalytic chemical polishing: transfer the steel A410 to the position of the catalytic polishing assembly 300, construct an immersion treatment area, and feed low-concentration acid solution and corrosion inhibitor into the immersion treatment area through the liquid supply mechanism, specifically 150mL of phosphoric acid (85%) + 50mL of sulfuric acid (98%) + 20g of sodium nitrate + 10g of urotropine + water to 1L, temperature: 45-55℃, time: 3-5 minutes, with megasonic vibration (frequency 1-3MHz) to accelerate solution penetration; Step 4: Ultrasonic assisted passivation, transfer the steel A410 to the position of the passivation treatment component 400, then construct an immersion treatment area, and feed the passivation solution into the immersion treatment area through the liquid supply mechanism. The formula of the passivation solution is: 2% γ-aminopropyltriethoxysilane (KH550) + 50% ethanol + 48% deionized water, and the pH is adjusted to 4.5 (acetic acid); Temperature: room temperature, time: 2-3 minutes, the steel is immersed in the passivation solution, and ultrasonic waves (frequency 20kHz) are applied to break bubbles and form a uniform silane film; Effect: Silane film thickness is 1-2μm, and the corrosion resistance time in salt spray test is ≥720 hours; Low concentration catalytic chemical polishing liquid; When sodium nitrate and urotropine are added to the phosphoric acid-sulfuric acid system, the polishing rate is ≥15μm / min and the substrate corrosion rate is <2μm / min.

[0028] Megasonic-Ultrasonic Combined Strengthening: Megasonic waves are used to accelerate mass transfer during the chemical polishing stage, and ultrasonic waves are used to enhance film formation during the passivation stage, increasing overall efficiency by 30%; Step 5: Drying: Drying conditions: 120℃, 10 minutes.

[0029] Table 1:

[0030] From the data comparison in Table 1, it can be clearly seen that the processing method of the present application is significantly improved compared with the existing processing method.

[0031] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for surface polishing of cold-formed steel, characterized in that: The following steps are involved: Step 1: Pretreatment: placing the steel section A (410) on the transmission assembly for transmission, and then allowing the steel section A (410) to remain at the position of the pretreatment assembly (200), at which time an immersion treatment area is constructed, and a pretreatment liquid is supplied to the immersion treatment area through a liquid supply mechanism; Step 2: Adaptive mechanical rough polishing: The steel section A (410) is transferred to the spraying treatment assembly (500), and the outer side of the steel section A (410) is evenly treated by the spraying treatment assembly (500), and the transmission of the transmission assembly is coordinated to achieve a spraying treatment without dead angles; Step 3: catalytic chemical polishing, transferring the steel A (410) to the position of the catalytic polishing assembly (300), constructing an immersion treatment area, and supplying low-concentration acid solution and corrosion inhibitor to the immersion treatment area through a liquid supply mechanism; Step 4: Ultrasonic assisted passivation, the steel A (410) is transferred to the position of the passivation treatment assembly (400), and then an immersion treatment area is constructed, and the passivation liquid is supplied to the immersion treatment area through a liquid supply mechanism.

2. The cold-formed steel surface polishing method according to claim 1, characterized in that: The formula of the pretreatment liquid is: sodium hydroxide 50g / L + sodium carbonate 30g / L + surfactant 5g / L, temperature: 60-70℃, time: 5-10 minutes; with ultrasonic wave of 40kHz frequency, it can remove oil stains and loose oxide scale to provide a clean surface for subsequent polishing.

3. The cold-formed steel surface polishing method according to claim 1, characterized in that: The granular material in the spraying treatment component (500): silicon carbide 80-120 mesh is mixed with polyurethane elastomer to form a flexible grinding block, which can fit complex cross-sections, and the pressure is controlled at 0.3-0.5 MPa.

4. The method for surface polishing of cold-formed steel according to claim 1, characterized in that: In the step 3, low concentration acid solution and corrosion inhibitor are 85% phosphoric acid 150mL + 98% sulfuric acid 50mL + sodium nitrate 20g + hexamethylenetetramine 10g + water to 1L, temperature: 45-55°C, time: 3-5 minutes, with megasonic vibration, frequency 1-3MHz, to accelerate solution penetration.

5. The cold-formed steel surface polishing method according to claim 1, characterized in that: In step 4: Passivation solution formula: 2% γ-aminopropyltriethoxysilane + 50% ethanol + 48% deionized water, pH adjusted to 4.5, room temperature, time: 2-3 minutes, the steel is immersed in the passivation solution, and ultrasonic waves are applied at a frequency of 20kHz to break bubbles and form a uniform silane film.

6. The cold-formed steel surface polishing method according to claim 1, characterized in that: The spraying processing assembly (500) comprises a fixed outer ring (506) sleeved on the outer side of the transmission path of the steel section A (410); a rotating inner ring (507) is rotatably provided inside the fixed outer ring (506); a plurality of spray heads (505) are connected inside the rotating inner ring (507); an air inlet end of the fixed outer ring (506) is connected to a spray pump (503) through a feed pipe (504); a suction pipe (502) is provided at a suction end of the spray pump (503); a lower end of the suction pipe (502) extends into a spray material box (501); a pipe axis of the spray head (505) is arranged at an acute angle to a cross section of the rotating inner ring (507); and a collecting port and a collecting bucket are provided at the bottom of a transmission frame (100) where the spraying processing assembly (500) is located, so as to collect waste materials.

7. The cold-formed steel surface polishing method according to claim 1, characterized in that: The pretreatment component (200), the catalytic polishing component (300) and the passivation treatment component (400) all include two parallel blocking baffles (403), the blocking baffles (403) are arranged in the transmission gap of the transmission component, the inner wall of the transmission frame (100) is provided with a guide slide groove (409) matching the blocking baffles (403), the two blocking baffles (403) are connected by a connecting crossbeam (401), and the center position of the connecting crossbeam (401) is aligned with the driving crossbar ( The transmission frame (100) is connected to the transmission frame (100) at one end, the other end of the driving cross bar (402) is connected to the output end of the lifting push rod (404), the lifting push rod (404) is installed on the outside of the transmission frame (100), the bottom of the transmission frame (100) is provided with a docking groove matching the bottom of the blocking partition (403), so that the blocking partition (403) isolates the inside of the transmission frame (100) into an immersion treatment area, and the inside of the transmission frame (100) is provided with a liquid supply mechanism for replenishing liquid in the immersion treatment area.

8. The cold-formed steel surface polishing method according to claim 1, characterized in that: The liquid supply mechanism comprises a liquid storage tank (406) for storing liquid, a liquid supply pump (407) being provided on the liquid storage tank (406), a liquid suction end of the liquid supply pump (407) extending into the interior of the liquid storage tank (406), a liquid outlet end of the liquid supply pump (407) being connected to a liquid supply pipe (408), an upper end of the liquid supply pipe (408) passing through a transmission frame (100) and being connected to an immersion treatment area, a liquid return port being provided at the bottom of the transmission frame (100) where the immersion treatment area is located, the liquid return port being connected to the liquid storage tank (406) via a reflux pipe (405), and a solenoid valve being provided on the reflux pipe (405).

9. The cold-formed steel surface polishing method according to claim 1, characterized in that: The transmission assembly comprises a transmission frame (100), the transmission frame (100) having a U-shaped long strip structure in cross section, a plurality of transmission rollers (103) for supporting the steel section A (410) being horizontally arranged inside the transmission frame (100), the plurality of transmission rollers (103) constituting a transmission surface for transferring the steel section A (410), and the transmission rollers (103) being connected to a transmission driving mechanism for driving the transmission rollers (103) to rotate.

10. The cold-formed steel surface polishing method according to claim 9, characterized in that: The transmission drive mechanism comprises a transmission wheel (102) arranged outside the transmission frame (100); the transmission wheel (102) is connected to a transmission roller (103) via a transmission shaft; a plurality of transmission wheels (102) are connected to each other via a transmission belt (101); a tensioning wheel (105) is rotatably arranged between adjacent transmission wheels (102); an end of one of the transmission rollers (103) is connected to a driving motor (104) for driving the transmission roller to rotate; the driving motor (104) is installed outside the transmission frame (100); one of the transmission rollers (103) is driven to rotate via the driving motor (104); the transmission roller (103) drives the transmission wheel (102) to rotate; the transmission wheel (102) drives a plurality of transmission wheels (102) to rotate via the transmission belt (101), thereby providing power for the synchronous rotation of the transmission rollers (103).

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