Device for detecting scratch resistance of passive film layer on surface of steel plate

Abstract

The utility model discloses a device for detecting the scratch resistance of a passivation film layer on the surface of a steel plate, which comprises a moving trolley, a measuring box is arranged in the moving trolley, a plurality of sliding chutes are uniformly arranged on the periphery of the outer side of the measuring box, and the sliding chutes are in sliding connection with sliding rails correspondingly arranged on the inner wall of the moving trolley; springs are fixed at four corners of the bottom of the measuring box, and the other ends of the springs are arranged in spring grooves in the bottom of the moving trolley; a measuring sleeve is arranged in the middle of the bottom of the measuring box, a through hole is formed in the position, corresponding to the moving trolley, below the measuring sleeve, and the measuring sleeve is detachably connected with a measuring pressure head. The device is applied to scratch resistance detection of a passivation film on the surface of a coated steel plate, replaces manual steel plate surface rubbing detection, and can qualitatively and quantitatively analyze the scratch resistance of the passivation film.

Description

Technical Field

[0001] This utility model relates to the field of steel plate surface testing technology, specifically to a device for testing the scratch resistance of a passivation film layer on a steel plate surface. Background Technology

[0002] During the processing of coated steel sheets, users shape them into sheet metal parts through stamping. The contact between the steel sheet and the stamping mold causes scratches, leaving marks on the surface that affect both aesthetics and product quality. For example, in the electrical cabinet industry, when drilling holes in steel sheets, the sheets are laid flat on a machine tool. A brush on the machine supports the sheet, and the continuous movement during positioning causes friction between the brush and the sheet, resulting in color variations and scratches that severely impact appearance. For industries with high surface quality requirements, processed parts must not have black, gray, or color-varying scratches.

[0003] To improve the scratch resistance of coated steel sheets, a passivation solution is usually applied to the surface of the coated steel sheet. After drying, a passivation film is formed. The quality characteristics of the passivation solution and the drying effect together affect the scratch resistance of the passivation film.

[0004] During processing, the passivation film on the surface of the coated steel sheet not only provides corrosion protection but also scratch resistance. The scratch resistance of the passivation film directly affects the surface quality of the steel sheet after processing. A passivation film with poor scratch resistance will result in the surface of the sheet metal parts not meeting aesthetic requirements after processing and use, leading to complaints and claims.

[0005] The scratch resistance of passivation films is typically tested by manually rubbing the surface of steel plates. However, this method is unreliable due to the inconsistent pressure applied and the lack of a defined number of rubs, leading to highly variable results and making quantitative testing impossible. Furthermore, manually rubbing the passivation film, a chemical product, poses a health risk and compromises operational safety.

[0006] Currently, there are no scientific testing instruments available, either domestically or internationally, to test the scratch resistance of passivation films. This leads to frequent customer complaints and claims after the coated steel sheets leave the factory, affecting not only product quality analysis but also communication and analysis with passivation solution manufacturers. Utility Model Content

[0007] The purpose of this utility model is to disclose a device for testing the scratch resistance of a passivation film layer on a steel plate surface, so as to solve the shortcomings of manual testing in the above-mentioned background technology, which is not scientific and accurate enough.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] A device for testing the scratch resistance of a passivation film on a steel plate surface includes a mobile trolley. A measuring box is installed inside the mobile trolley. Multiple sliding grooves are evenly arranged around the outer perimeter of the measuring box, and these grooves are slidably connected to sliding rails corresponding to those on the inner wall of the mobile trolley. Springs are fixed at the four corners of the bottom of the measuring box, with the other end of each spring resting in a spring groove at the bottom of the mobile trolley. A measuring sleeve is centrally located at the bottom of the measuring box, with a through hole at the lower part of the sleeve corresponding to the position of the mobile trolley. A measuring pressure head is detachably connected to the measuring sleeve.

[0010] Furthermore, to prevent measurement errors caused by the weights swaying during the movement of the trolley, the measuring box is equipped with multiple weight slots evenly spaced inside, and plate-type weights are held in these slots.

[0011] Furthermore, to facilitate the left and right movement of the trolley, a handle is fixed to the outside of the trolley.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] Before measurement, remove the weights and adjust the indenter position to ensure there is a gap between the indenter and the surface of the steel plate being measured; at this point, the pressure value is zero. Then, add the weights. Under the influence of gravity, the indenter moves downward to contact the steel plate surface and applies pressure. Multiple detection modes are available. For example, with a fixed pressure value, the indenter reciprocates against the steel plate, and the number of rubs corresponding to the appearance of passivation film peeling or discoloration is measured. Alternatively, with a fixed number of rubs, weights are added, and different pressures are applied; the indenter reciprocates against the steel plate, and the pressure corresponding to the appearance of passivation film peeling or discoloration is measured. Attached Figure Description

[0014] Figure 1 This is a front view of the structural cross-section of this utility model.

[0015] Figure 2 This is a three-dimensional structural diagram of the present invention.

[0016] In the diagram, 1-moving trolley, 2-measuring box, 3-slide groove, 4-slide rail, 5-measuring sleeve, 6-spring, 7-measuring pressure head, 8-weight slot, 9-plate weight, 10-handle. Detailed Implementation

[0017] The present invention will be further explained below with reference to the accompanying drawings.

[0018] like Figure 1-2As shown, a device for testing the scratch resistance of a passivation film layer on a steel plate surface includes a mobile trolley 1. A measuring box 2 is installed inside the mobile trolley 1. Multiple sliding grooves 3 are evenly arranged around the outer perimeter of the measuring box 2, and these grooves 3 are slidably connected to sliding rails 4 corresponding to those on the inner wall of the mobile trolley 1. Springs 6 are fixed at the four corners of the bottom of the measuring box 2, with the other end of each spring 6 resting in a spring groove at the bottom of the mobile trolley 1. A measuring sleeve 5 is centrally located at the bottom of the measuring box 2, with a through hole at the bottom of the sleeve corresponding to the position on the mobile trolley 1. The measuring sleeve 5 extends out of the through hole and is detachably connected to a measuring pressure head 7. Multiple weight slots 8 are evenly arranged inside the measuring box 2, and plate weights 9 are held in each weight slot 8. A handle 10 is also fixed to the outer side of the mobile trolley 1.

[0019] It should be noted that in the above device structure, the sliding groove and rail combination for fixing the measuring box 2 on the outside and the slot for holding the plate weight inside the measuring box 2 are both designed to ensure that the entire measuring box 2 can transmit the pressure of the weight in the vertical direction.

[0020] As a first embodiment where the measuring sleeve 5 and the measuring pressure head 7 are detachably connected, the inner wall of the measuring sleeve 5 is machined with internal threads, and the outer wall of the measuring pressure head 7 is machined with external threads. The two are connected by the cooperation of internal and external threads, and the up and down positions can be adjusted by turning the measuring pressure head 7.

[0021] As another embodiment where the measuring sleeve 5 and the measuring head 7 are detachably connected, a threaded through hole is provided on the outer wall of the measuring sleeve 5, and a tightening screw is connected in the threaded through hole. After the measuring head 7 is inserted into the measuring sleeve 5 and the exposed length is adjusted, the tightening screw is tightened to fix the measuring head 7 and the measuring sleeve 5.

[0022] The plate weights (9) are used for friction pressure measurement. Each weight weighs 1000 grams, and there are 10 weights in total. By adding weights, pressure values ​​at 10 pressure levels can be measured. The pressure range is 1 kgf to 10 kgf.

[0023] The measuring indenter 7 is used for friction on the steel plate surface. The indenter is made of silicone or polyurethane and is connected to the measuring box via a measuring sleeve. The weight pressure is transmitted to the indenter. Before measurement, remove the weight and adjust the position of the measuring indenter to ensure it is in perfect contact with the surface of the steel plate being measured; at this point, the pressure value is zero. Then, add the weight. Under the influence of gravity, the measuring indenter moves downward to contact the steel plate surface and applies pressure.

[0024] The working process of this utility model is as follows:

[0025] Before measurement, remove the plate weight 9 and adjust the position of the measuring indenter 7 to ensure that the measuring indenter is in just contact with the surface of the steel plate being measured or has a slight gap. At this point, the pressure value is zero, and the spring is in a state of force equilibrium. Then, add the plate weight 9. Under the gravity of the plate weight 9, the equilibrium state of the spring 6 is disrupted, and the measuring indenter 7 moves down to contact the surface of the steel plate and applies pressure. At this time, manually push and pull the measuring instrument housing back and forth, record the number of pushes and pulls, and visually observe the surface of the steel plate until the surface of the steel plate shows demolding or discoloration. Stop the operation, record the number of repeated frictions and the indenter pressure, and evaluate the scratch resistance of the passivation film layer by the number of frictions and the indenter pressure.

[0026] In summary, this invention is applied to the testing of the scratch resistance of the passivation film on the surface of coated steel plates, replacing manual rubbing of the steel plate surface for testing. It can qualitatively and quantitatively analyze the scratch resistance characteristics of the passivation film. For example, it can achieve multiple testing modes. For instance, with a fixed pressure value, the indenter rubs the steel plate back and forth, measuring the number of rubbing cycles corresponding to the passivation film peeling off or discoloration; or with a fixed number of rubbing cycles, weights are added to apply different pressures, and the indenter rubs the steel plate back and forth, measuring the pressure corresponding to the passivation film peeling off or discoloration. The friction pressure of this invention is calibrated by a combination of weights, making it easy to operate. It does not require a power source; the measuring instrument is manually moved repeatedly to complete the repeated friction motion, providing qualitative and quantitative scientific analysis characteristics.

Claims

1. A device for detecting the scratch resistance of a passivation film layer on a steel sheet surface, characterized by comprising: a scratch tester; a scratch tester control unit; a scratch tester data storage unit; a scratch tester data analysis unit; and a scratch tester data output unit. The utility model relates to a kind of mobile trolley (1), the mobile trolley (1) is provided with measuring box (2) inside, and the outer side of measuring box (2) is evenly provided with multiple chute (3) around, the chute (3) is slidably connected with the slide rail (4) corresponding to being arranged on the inner wall of mobile trolley (1);Spring (6) is fixed at the bottom of measuring box (2) four corners, and the other end of spring (6) is seated in the spring groove in the bottom of mobile trolley (1);Measuring sleeve (5) is centrally arranged at the bottom of measuring box (2), and the position corresponding hole is opened in the lower side of measuring sleeve (5) with mobile trolley (1), and measuring sleeve (5) extends through hole and is detachably connected with measuring pressure head (7).

2. The device for detecting the scratch resistance of the passivation film layer on the surface of a steel sheet according to claim 1, characterized in that, The measuring box (2) is evenly provided with multiple weight clamping grooves (8) inside, and the weight clamping groove (8) is clamped with plate weight (9) inside.

3. The device for detecting the scratch resistance of the passivation film layer on the surface of a steel sheet according to claim 1, characterized in that, The mobile trolley (1) is fixed with handle (10) outside.

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