Method and device for detecting r-round bending of hot-rolled h-shaped steel by 90 degrees

Abstract

The application discloses a hot-rolled H-shaped steel r-round corner 90-degree bending detection method and device, belongs to the hot-rolled H-shaped steel testing technical field, and according to a sampling inspection sequence, two or more hot-rolled H-shaped steel samples are taken from each batch, are placed into a constant-temperature or refrigeration container, the temperature of the sample is reduced to a set temperature, and then the sample is taken out and placed in a hot-rolled H-shaped steel r-round corner 90-degree bending test device; the flange of the hot-rolled H-shaped steel is bent outward and flattened to 90 degrees; the r-round corner of the hot-rolled H-shaped steel is observed; if there is no visible crack, it is judged that the batch test is qualified; if there is a visible crack, it is judged that the batch test is unqualified. The application adopts the r-round corner 90-degree bending test method of the hot-rolled H-shaped steel, the test method is simple and easy to use, the safety performance of the hot-rolled H-shaped steel of a steel structure serving under different environmental temperatures can be simulated, hidden defects of weak links of the r-round corner where stress of the hot-rolled H-shaped steel is most concentrated can be detected, and the labor and material costs are saved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hot-rolled H-shaped steel testing, in particular to a hot-rolled H-shaped steel r-round corner 90-degree bending detection method and device. BACKGROUND

[0002] The modern construction industry is developing towards environmental protection, low carbon, and safe high-performance steel structure construction. Hot-rolled H-shaped steel is a high-efficiency and energy-saving building steel, and has a huge development space. Hot-rolled H-shaped steel is usually used for large bridges, high-rise buildings and other important purposes with large carrying capacity and good section stability performance. Hot-rolled H-shaped steel has good bending resistance, torsion resistance and compression resistance in safe and reliable service, which puts forward higher requirements for the toughness and ductility of hot-rolled H-shaped steel.

[0003] The prior art uses impact energy test and 180-degree bending test to detect the impact toughness and cold bending process performance of hot-rolled H-shaped steel. The impact energy test and 180-degree bending test need to sample longitudinally along the rolling direction on the flange of the hot-rolled H-shaped steel, and then make fine test samples required by the test on a sample making machine. Then, the test is carried out on an impact energy testing machine and a hydraulic bending testing machine. The shortcomings are: (1) long time-consuming, tedious work for the tester, and high test cost; (2) no detection is carried out on the stress concentrated r-round corner of the hot-rolled H-shaped steel product. The r-round corner is the intersection of the flange and the web of the hot-rolled H-shaped steel. The internal defects such as steel inclusions and sharp crack tip stress concentration at this place affect the safe service performance of the steel member made of the hot-rolled H-shaped steel. SUMMARY

[0004] In order to overcome the problem that the prior art does not detect the stress concentrated r-round corner of the hot-rolled H-shaped steel product, resulting in incomplete evaluation of the safe service performance of the steel member made of the hot-rolled H-shaped steel, the present application provides a hot-rolled H-shaped steel r-round corner 90-degree bending detection method, which comprises the following steps:

[0005] Step one, according to the sampling inspection order, take two or more hot-rolled H-shaped steel samples from each batch, cut the samples to a length of L respectively, and remove the cutting burrs;

[0006] Step two, place the samples in step one into a constant temperature or refrigeration container, reduce the temperature of the samples to a set temperature, take out the samples and place them in a hot-rolled H-shaped steel r-round corner 90-degree bending test device;

[0007] Step three, start the hot-rolled H-shaped steel r-round corner 90-degree bending test device, and bend the hot-rolled H-shaped steel flange outward and flatten it to 90 degrees;

[0008] Step four, observing the r-round corner of the hot-rolled H-beam, if no visible cracks are generated, it is judged that the r-round corner 90° bending test of the batch of hot-rolled H-beam is qualified; if visible cracks are generated, it is judged that the r-round corner 90° bending test of the batch of hot-rolled H-beam is unqualified.

[0009] The test device is used to bend the r-round corner of the hot-rolled H-beam, and then used to detect the reliability of the hot-rolled H-beam for safe service, as a supplement to the domestic and foreign hot-rolled H-beam product standards and detection standards, and also as a basis for evaluating the cleanliness of the intermediate product steel billet in the intermediate production process.

[0010] Preferably, in step two, the set temperature is one of -40℃-20℃.

[0011] Preferably, in step two, the set temperature is 20℃, 0℃, -20℃ or -40℃.

[0012] Preferably, in step one, the length of the hot-rolled H-beam sample in each batch is 400-600mm, and the sample is cut to a length L, wherein the length L is 250-400mm.

[0013] Preferably, in step one, the length of the hot-rolled H-beam sample in each batch is 500mm, and the sample is cut to a length L, wherein the length L is 300mm.

[0014] Preferably, in step three, the flange of the hot-rolled H-beam is placed vertically, and a top pressing plate is used to press outwardly against the flange until the flange is bent and flattened to 90°.

[0015] Preferably, in step three, the test device includes a groove base, a bending pressing mechanism and a flattening pressing mechanism, the upper surface of the groove base is formed with two parallel strip grooves, the flanges of the hot-rolled H-beam are first placed vertically in the strip grooves, the bending pressing mechanism is started to press the flanges outwardly to bend to about 45°, then the bending pressing mechanism is driven to return to the original position, and the flattening pressing mechanism is started to continue to press the inclined flanges to be flat, realizing the test of bending the flanges to 90°.

[0016] Preferably, in step three, the bending pressing mechanism simultaneously presses against the inner sides of the flanges of the hot-rolled H-beam to bend outwardly to about 45°, then the bending pressing mechanism is driven to return to the original position, and the two flattening pressing mechanisms located on both sides of the hot-rolled H-beam are started to continue to press the inclined flanges to be flat, realizing the test of bending the flanges on both sides to 90°.

[0017] The r-round corner 90-degree bending test method for hot-rolled H-shaped steel is simple and easy to use, can simulate the safety performance of the hot-rolled H-shaped steel serving under different ambient temperatures, and thus detect the hidden defects of the weak link of the r-round corner of the hot-rolled H-shaped steel with the most concentrated stress, while saving labor and material costs.

[0018] The application further provides a r-round corner 90-degree bending detection device for hot-rolled H-shaped steel, which adopts the above detection method and comprises a testing machine frame, a groove base, a bending top abutting mechanism and a flattening top abutting mechanism.

[0019] The hot-rolled H-shaped steel is placed in the strip-shaped grooves on the groove base, and the bending top abutting mechanism and the flattening top abutting mechanism are used to sequentially apply force to one of the flanges of the hot-rolled H-shaped steel, so that the flange is first bent and then flattened to 90 degrees from the r-round corner, thereby achieving the purpose of r-round corner bending test.

[0020] Preferably, the hot-rolled H-shaped steel further comprises a web connecting the two flanges, the widths of the two strip-shaped grooves are equal to the thickness of the flange of the hot-rolled H-shaped steel, the depths of the two strip-shaped grooves are greater than or equal to the distance from the end of the flange of the hot-rolled H-shaped steel to the plane on which the side of the web close to the end of the flange is located, and the distance between the two strip-shaped grooves is equal to the distance between the two flanges of the hot-rolled H-shaped steel.

[0021] Preferably, the bending top abutting mechanism comprises a bending hydraulic cylinder, a hydraulic cylinder seat and a bending top abutting plate, the hydraulic cylinder seat is fixedly installed on one side of the testing machine frame, the bending hydraulic cylinder is connected to the hydraulic cylinder seat through a hydraulic cylinder rotating shaft and can rotate along the direction of the hydraulic cylinder rotating shaft, and the bending top abutting plate is fixedly installed on the movable end of the bending hydraulic cylinder.

[0022] Preferably, the extension direction of the movable end of the bending hydraulic cylinder is perpendicular to the length direction of the strip-shaped groove, and the direction of the hydraulic cylinder rotating shaft is the same as the length direction of the strip-shaped groove.

[0023] When the hot-rolled H-shaped steel is placed in the strip-shaped grooves of the groove base, the height of the hydraulic cylinder rotating shaft is higher than the height of the top of the flange of the hot-rolled H-shaped steel.

[0024] Preferably, when the bending top abutting plate abuts against the flange of the hot-rolled H-shaped steel, the included angle between the extension direction of the movable end of the bending hydraulic cylinder and the horizontal plane is 30-60°.

[0025] Preferably, the flattening top abutting mechanism comprises a flattening hydraulic cylinder and a flattening top abutting plate, the flattening hydraulic cylinder is fixedly installed on the top of the testing machine frame, and the flattening top abutting plate is fixedly installed on the movable end of the flattening hydraulic cylinder, and the telescopic direction of the movable end of the flattening hydraulic cylinder is vertically arranged.

[0026] Preferably, the bending top abutting mechanism is located at a position away from the other one of the strip-shaped grooves on one side of the testing machine frame, and is fixedly installed on one side of the testing machine frame; and the flattening top abutting mechanism is arranged above the strip-shaped groove away from the bending top abutting mechanism and is deviated to a position away from the bending top abutting mechanism.

[0027] Preferably, the horizontal distance between the lower end of the flattening top abutting mechanism and the strip-shaped groove is less than half of the length of the flange of the hot-rolled H-shaped steel.

[0028] In the actual bending test, the bending top abutting mechanism is first driven to abut against the inner side of the flange of the hot-rolled H-shaped steel, so that the flange is bent outward to about 45°, then the bending top abutting mechanism is retracted, the flattening top abutting mechanism is driven to continue abutting against the inner side of the flange of the hot-rolled H-shaped steel to bend 90°, i.e. to flatten the state. After bending 90°, no visible cracks are generated at the r-round corner of the hot-rolled H-shaped steel, so that it can be judged that the batch (furnace) of hot-rolled H-shaped steel r-round corner 90° bending test is qualified.

[0029] Preferably, the groove-shaped base comprises a fixed base and a movable base, the movable base is installed on one side of the fixed base through a base adjusting mechanism and adjusts the horizontal position of the movable base relative to the fixed base; the upper surfaces of the fixed base and the movable base are on the same plane, and the upper surfaces of the fixed base and the movable base are each formed with a strip-shaped groove, the strip-shaped grooves on the upper surfaces of the fixed base and the movable base are parallel to each other, and the adjusting direction of the base adjusting mechanism is perpendicular to the length direction of the strip-shaped grooves.

[0030] Here, the distance between the two strip-shaped grooves is equal to the distance between the two flanges of the hot-rolled H-shaped steel by adjusting the distance between the movable base and the fixed base according to the specification of the hot-rolled H-shaped steel, the hot-rolled H-shaped steel is placed in the strip-shaped grooves on the groove-shaped base, and the flange located on the fixed base of the hot-rolled H-shaped steel is bent and flattened outward from the r-round corner to 90° by the bending and flattening top abutting mechanism, so as to achieve the purpose of r-round corner bending test.

[0031] Preferably, the base adjusting mechanism comprises a horizontal adjusting rod and an adjusting hand wheel, a first adjusting hole is formed on one side of the fixed base close to the movable base, a second adjusting hole penetrating through the opposite sides of the movable base is formed at a position corresponding to the first adjusting hole on the movable base; the horizontal adjusting rod passes through the second adjusting hole, and one end of the horizontal adjusting rod is installed in the first adjusting hole, and the other end of the horizontal adjusting rod is installed with the adjusting hand wheel.

[0032] Preferably, an adjusting seat body is fixedly installed on the horizontal adjusting rod near one side of the movable base.

[0033] Preferably, an outer circumferential surface of the horizontal adjusting rod is formed with external threads near the fixed base, and the first adjusting hole is formed with internal threads matching the external threads.

[0034] Preferably, the base adjusting mechanism further comprises a positioning moving rod, the fixed base is formed with a first positioning hole near one side of the movable base, the movable base is formed with a second positioning hole penetrating through opposite sides of the movable base at a position corresponding to the first positioning hole, the positioning moving rod penetrates through the second positioning hole and is installed in the first positioning hole at one end, and a straight line where the positioning moving rod is located is parallel to a straight line where the horizontal adjusting rod is located.

[0035] Preferably, the bending abutting mechanism is fixedly installed on the testing machine frame away from the fixed base.

[0036] Preferably, when the bending abutting plate abuts on the flange of the hot-rolled H-shaped steel located on the fixed base, an included angle between an extension direction of the movable end of the unbending hydraulic cylinder and a horizontal plane is 30-60°.

[0037] Beneficial effects:

[0038] The beneficial effects generated by adopting the technical scheme of the present application are as follows:

[0039] (1) The hot-rolled H-shaped steel is placed in the strip-shaped groove on the groove base, the bending abutting mechanism and the flattening abutting mechanism are used to sequentially apply force to one of the flanges of the hot-rolled H-shaped steel, so that the flange is first bent and then flattened to 90° from the r-round corner, so as to achieve the purpose of r-round corner bending test.

[0040] (2) The r-round corner 90° bending test of the hot-rolled H-shaped steel is first proposed, which is a reliable guarantee for verifying the safety service of the steel product, and also a supplement to the standards of the hot-rolled H-shaped steel products at home and abroad. The results of the detection method are also used as the basis for evaluating the cleanliness of the intermediate product billet in the intermediate production process (steel smelting, refining, continuous casting).

[0041] (3) The r-round corner 90° bending test of the hot-rolled H-shaped steel is simple and easy to use, can simulate the safety performance of the hot-rolled H-shaped steel of the steel structure under different environmental temperatures, so as to detect the hidden defects of the weak link of the r-round corner where the stress of the hot-rolled H-shaped steel is most concentrated, and save the labor and material costs. BRIEF DESCRIPTION OF DRAWINGS

[0042] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation to the scope. Other related drawings can also be obtained by those skilled in the art without any creative effort based on the drawings.

[0043] Figure 1 is a preferred r-round corner bending 90° detection flow chart of the hot-rolled H-shaped steel of the present application;

[0044] Figure 2 is a preferred hot-pressed H-shaped steel structure schematic diagram of the present application;

[0045] Figure 3 is a preferred r-round corner crack condition of the hot-pressed H-shaped steel in the bent state of the present application;

[0046] Figure 4 is a preferred main view schematic diagram of the bending 90° detection device in Embodiment One of the present application;

[0047] Figure 5 is a preferred side view schematic diagram of the bending 90° detection device in Embodiment One of the present application;

[0048] Figure 6 is a preferred main view schematic diagram of the bending 90° detection device in Embodiment Two of the present application;

[0049] Figure 7 is a preferred internal structure schematic diagram of the base adjusting mechanism in Embodiment Two of the present application;

[0050] Figure 8 is a preferred main view schematic diagram of the bending 90° detection device in Embodiment Three of the present application; Figure 1 ;

[0051] Figure 9 is a preferred main view schematic diagram of the bending 90° detection device in Embodiment Three of the present application. Figure 2 . DETAILED DESCRIPTION

[0052] ​In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative labor fall within the protection scope of the present application. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative labor fall within the protection scope of the present application.

[0053] As shown in Figure 1 The hot-rolled H-shaped steel r-round corner 90° bending detection method comprises the following steps:

[0054] Step S101, according to the sampling inspection sequence, two or more hot-rolled H-shaped steel samples are taken from each batch, the samples are cut to a length of L respectively, and the cutting burrs are removed;

[0055] Step S102, the sample in step one is placed in a constant temperature or refrigeration container, the temperature of the sample is reduced to a set temperature, then the sample is taken out and placed in a hot-rolled H-shaped steel r-round corner 90° bending test device;

[0056] Step S103, the hot-rolled H-shaped steel r-round corner 90° bending test device is started, and the flange of the hot-rolled H-shaped steel is bent outward and flattened to 90°;

[0057] Step S104, the r-round corner of the hot-rolled H-shaped steel is observed, if no visible cracks are generated, it is judged that the hot-rolled H-shaped steel r-round corner 90° bending test of this batch is qualified; if visible cracks are generated, it is judged that the hot-rolled H-shaped steel r-round corner 90° bending test of this batch is unqualified.

[0058] The test device is used to bend the hot-rolled H-shaped steel r-round corner 90°, and then used to detect the reliability of the hot-rolled H-shaped steel for safe service, as a supplement to the domestic and foreign hot-rolled H-shaped steel product standards and detection standards, and also as a basis for evaluating the cleanliness of the intermediate product steel billet in the intermediate production process.

[0059] As a preferred embodiment, in step S102, the set temperature is one of -40℃-20℃.

[0060] As a preferred embodiment, in step S102, the set temperature is 20℃, 0℃, -20℃ or -40℃.

[0061] As a preferred embodiment, in step S101, the length of the hot-rolled H-shaped steel sample in each batch is 400-600 mm, and the sample is cut to a length L, wherein the length L is 250-400 mm.

[0062] As a preferred embodiment, in step S101, the length of the hot-rolled H-shaped steel sample in each batch is 500 mm, and the sample is cut to a length L, wherein the length L is 300 mm.

[0063] As a preferred embodiment, in step S103, the flange of the hot-rolled H-shaped steel is placed vertically, and a top plate is used to top against the flange of the hot-rolled H-shaped steel to top outward until the flange is bent and flattened to 90°.

[0064] As a preferred embodiment, in step S102, the test device includes a groove base, a bending top mechanism and a flattening top mechanism. The upper surface of the groove base is formed with two parallel strip grooves. The flanges of the hot-rolled H-shaped steel are first placed vertically in the strip grooves, the bending top mechanism is started to top the flanges of the hot-rolled H-shaped steel outward to bend to about 45°, then the bending top mechanism is driven to return to the original position, and the flattening top mechanism is started to continue to press the inclined flanges to be flat, realizing the test of bending the flanges to 90°.

[0065] As a preferred embodiment, in step S103, the bending top mechanism simultaneously tops against the inner sides of the flanges of the hot-rolled H-shaped steel on both sides to top outward to bend to about 45°, then the bending top mechanism is driven to return to the original position, and the flattening top mechanisms located on both sides of the hot-rolled H-shaped steel are started to continue to press the inclined flanges to be flat, realizing the test of bending the flanges on both sides to 90°.

[0066] The r-round corner 90° bending test method for hot-rolled H-shaped steel is simple and easy to use, can simulate the safety performance of the hot-rolled H-shaped steel of the steel structure in service under different environmental temperatures, and thus detect the hidden defects of the weak link of the r-round corner where the stress of the hot-rolled H-shaped steel is most concentrated, while saving labor and material costs.

[0067] Several structures of the r-round corner 90° bending test device for hot-rolled H-shaped steel are introduced below, which can be used for the r-round corner 90° bending test.

[0068] Example 1:

[0069] As Figures 2 to 5As shown, the hot-rolled H-shaped steel r-round bending 90° detection device comprises a testing machine frame 1, a groove base 2, a bending top abutting mechanism 3 and a flattening top abutting mechanism 4. The groove base 2 is fixedly installed at the bottom of the testing machine frame 1. The bending top abutting mechanism 3 and the flattening top abutting mechanism 4 are fixedly installed above the groove base 2 of the testing machine frame 1. Two parallel strip grooves 24 are formed on the upper surface of the groove base 2.

[0070] The hot-rolled H-shaped steel 100 is placed in the strip grooves of the groove base. The bending top abutting mechanism and the flattening top abutting mechanism are used to apply force to one of the flanges 101 of the hot-rolled H-shaped steel in sequence, so that the flange 101 is first bent and then flattened outward from the r-round corner 103 to 90°, achieving the purpose of r-round bending test.

[0071] The hot-rolled H-shaped steel 100 further comprises a web 102 connecting the two flanges 101. The width of the two strip grooves 24 is equal to the thickness of the flange 101 of the hot-rolled H-shaped steel 100. The depth of the two strip grooves 24 is greater than or equal to the distance from the end of the flange 101 to the plane on which the side of the web 102 close to the end of the flange 101. The distance between the two strip grooves 24 is equal to the distance between the two flanges 101 of the hot-rolled H-shaped steel 100.

[0072] The bending top abutting mechanism 3 comprises a bending hydraulic cylinder 31, a hydraulic cylinder base 32 and a bending top abutting plate 33. The hydraulic cylinder base 32 is fixedly installed on one side of the testing machine frame 1. Here, a mounting beam 35 can be provided on the side of the testing machine frame 1, and the hydraulic cylinder base 32 is installed on the mounting beam 35. The bending hydraulic cylinder 31 is connected to the hydraulic cylinder base 32 through a hydraulic cylinder rotating shaft 34 and can rotate along the axis of the hydraulic cylinder rotating shaft 34. The bending top abutting plate 33 is fixedly installed on the movable end of the bending hydraulic cylinder 31.

[0073] The extension direction of the movable end of the bending hydraulic cylinder 31 is perpendicular to the length direction of the strip groove 24, and the axis direction of the hydraulic cylinder rotating shaft 34 is the same as the length direction of the strip groove 24.

[0074] When the hot-rolled H-shaped steel is placed in the strip groove of the groove base, the height of the hydraulic cylinder rotating shaft is higher than the height of the top of the flange of the hot-rolled H-shaped steel.

[0075] When the bending top abutting plate 33 abuts against the flange 101 of the hot-rolled H-shaped steel 100, the included angle between the extension direction of the movable end of the bending hydraulic cylinder 31 and the horizontal plane is 30-60°.

[0076] The flattening top abutting mechanism 4 comprises a flattening hydraulic cylinder 41 and a flattening top abutting plate 42, the flattening hydraulic cylinder 41 is fixedly installed on the top of the testing machine frame 1, the flattening top abutting plate 42 is fixedly installed on the movable end of the flattening hydraulic cylinder 41, and the telescopic direction of the movable end of the flattening hydraulic cylinder 41 is vertically arranged.

[0077] The bending top abutting mechanism 3 is located at a position away from the other one of the strip-shaped grooves 24 on one side of the testing machine frame 1, and is fixedly installed on one side of the testing machine frame 1; the flattening top abutting mechanism 4 is arranged at a position above the strip-shaped groove 24 away from the bending top abutting mechanism 3 and deviated to the side away from the bending top abutting mechanism 3.

[0078] The horizontal distance between the lower end of the flattening top abutting mechanism 4 and the strip-shaped groove 24 is less than half the length of the flange 101 of the hot-rolled H-shaped steel 100.

[0079] In the actual bending test, the bending top abutting mechanism can be first driven to abut against the inner side of the flange of the hot-rolled H-shaped steel to bend it outward to about 45°, then the bending top abutting mechanism is retracted, the flattening top abutting mechanism is driven to continue abutting against the inner side of the flange of the hot-rolled H-shaped steel downward to bend 90°, i.e. to flatten the state; after bending 90°, no visible cracks are generated at the r-round corner of the hot-rolled H-shaped steel, so that it can be judged that the batch (furnace) of hot-rolled H-shaped steel r-round corner 90° bending test is qualified.

[0080] In order to realize the bending and flattening of the entire flange 101, the length of the bending top abutting plate 33 and the flattening top abutting plate 42 is preferably greater than or equal to the length of the flange 101 along the length direction of the hot-rolled H-shaped steel, of course, it can also be slightly smaller than the length of the flange 101 along the length direction of the hot-rolled H-shaped steel, but it cannot be too small.

[0081] In addition, in order to realize the flattening of the flange 101, the distance from the strip-shaped groove 24 to the two inner walls of the testing machine frame 1 is greater than the distance of the bent section of the flange 101, and the distance from the strip-shaped groove 24 to the two inner walls of the testing machine frame 1 is preferably greater than half the total length of the flange 101.

[0082] The bending top abutting mechanism 3 and the flattening top abutting mechanism 4 can also use the same driving mechanism, which drives the top abutting plate abutting against the flange of the hot-rolled H-shaped steel to move along a curved track and continuously apply a pushing force and a pressing force to the side surface of the flange, so that the flange is bent from the vertical state to the horizontal state by 90°, achieving the purpose of bending and flattening.

[0083] In the actual bending test, the bending abutment mechanism is first driven to press against the inner side of the flange of the hot-rolled H-beam, bending it outward to about 45°. Then, the bending abutment mechanism is retracted, and the flattening abutment mechanism is driven downward to continue pressing against the inner side of the flange of the hot-rolled H-beam until it bends to 90°, i.e., to the flattened state. After bending 90°, if no visible cracks are generated at the radius of the hot-rolled H-beam, it can be judged that the 90° bending test of the radius of the hot-rolled H-beam of that batch (furnace) is qualified.

[0084] Example 2:

[0085] like Figure 6 and 7 As shown, the hot-rolled H-beam radius bend detection device (r-shaped corner bend 90°) optimizes the design of the channel base 2 to accommodate hot-rolled H-beams of various specifications. Specifically, the channel base 2 is designed so that the distance between the two grooves 24 on its surface is adjustable. The channel base 2 includes a fixed base 21 and a movable base 22. The movable base 22 is mounted on one side of the fixed base 21 via a base adjustment mechanism 23, which adjusts the horizontal position of the movable base 22 relative to the fixed base 21. The upper surfaces of the fixed base 21 and the movable base 22 are on the same plane, and both upper surfaces have grooves 24 formed thereon. The grooves on the upper surfaces of the fixed base 21 and the movable base 22 are parallel to each other, and the adjustment direction of the base adjustment mechanism 23 is perpendicular to the length direction of the grooves 24.

[0086] Here, the distance between the movable base and the fixed base is adjusted according to the specifications of the hot-rolled H-beam 100 so that the distance between the two strip grooves 24 is equal to the distance between the two flanges 101 of the hot-rolled H-beam 100. Then, the hot-rolled H-beam 100 is placed in the strip grooves 24 on the groove base. The bending and flattening top abutment mechanism applies force to the flanges of the hot-rolled H-beam located on the fixed base, so that the flanges are bent and flattened from the r-round corner to the outside until they are bent at 90°, thus achieving the purpose of the r-round corner bending test.

[0087] The base adjustment mechanism 23 includes a horizontal adjustment rod 231 and an adjustment handwheel 232. A first adjustment hole 211 is formed on the fixed base 21 near the movable base 22. A second adjustment hole 221 is formed on the movable base 22 at a position corresponding to the first adjustment hole 211, penetrating both sides of the movable base 22. The horizontal adjustment rod 231 passes through the second adjustment hole 221, with one end installed in the first adjustment hole 211 and the other end installed with the adjustment handwheel 232.

[0088] An adjustment seat 233 is fixedly installed on the side of the horizontal adjustment rod 231 near the movable base 22.

[0089] The outer circumferential surface of the horizontal adjusting rod 231 is formed with external threads near the fixed base, and the inner wall of the first adjusting hole 211 is formed with internal threads matching the external threads.

[0090] The base adjusting mechanism 23 further comprises a positioning moving rod 234. The fixed base 21 is formed with a first positioning hole 212 near one side of the movable base 22. The movable base 22 is formed with a second positioning hole 222 penetrating through the opposite sides of the movable base 22 at a position corresponding to the first positioning hole 212. The positioning moving rod 234 penetrates through the second positioning hole 222 and is installed in the first positioning hole 212 at one end. The straight line where the positioning moving rod 234 is located is parallel to the straight line where the horizontal adjusting rod 231 is located.

[0091] Here, the bending stop mechanism 3 is fixedly installed on the test machine frame 1 away from the fixed base 21.

[0092] When the bending stop plate 33 stops on the flange 101 of the hot-rolled H-shaped steel 100 located on the fixed base 21, the angle between the telescopic direction of the movable end of the unbending hydraulic cylinder 31 and the horizontal plane is 30-60°.

[0093] During the test, the bending stop mechanism 3 is installed at the middle position of the top of the test machine frame 1, and the two flattening stop mechanisms 4 are respectively installed on the two sides of the bending stop mechanism 3 at the top of the test machine frame 1. When the flange is bent outward, the bending angle can be selected as 45°. The bending stop mechanism 3 moves upward to retract, and the two flattening stop mechanisms 4 press the two flanges on the two sides to flatten to 90°. The horizontal positions of the bending stop mechanism 3 and the two flattening stop mechanisms 4 on the top of the test machine frame 1 can be adjusted, that is, the distance between the two movable bases relative to the fixed base is adjusted according to the specifications of the hot-rolled H-shaped steel 100, so that the distance between the two strip-shaped grooves 24 is equal to the distance between the two flanges 101 of the hot-rolled H-shaped steel 100. Then, the hot-rolled H-shaped steel 100 is placed in the strip-shaped grooves 24 on the groove-shaped base, the horizontal position of the bending stop mechanism 3 is adjusted so that it is located in the middle of the two flanges 101 of the hot-rolled H-shaped steel 100, and the bending and flattening stop mechanism is used to exert force on two flanges of the hot-rolled H-shaped steel to bend and flatten the flanges from the r round corner to the outside to 90°, so as to achieve the purpose of r round corner bending test.

[0094] Embodiment Three:

[0095] The hot-rolled H-shaped steel r round corner bending 90° detection device, wherein the test machine frame 1 and the groove-shaped base 2 have the same structure as in Embodiment One and Embodiment Two. The bending stop mechanism 3 and the flattening stop mechanism 4 are adjusted, and the flanges on both sides of the hot-rolled H-shaped steel are simultaneously bent to 90°, such as Figure 8 and 9As shown, specifically, the bending top abutting mechanism 3 comprises a bending hydraulic cylinder 31 and two bending top abutting plates 33, wherein the bending hydraulic cylinder 31 is installed at a position right above the web of the hot-rolled H-shaped steel, and the movable end of the bending hydraulic cylinder 31 vertically extends downward, and the two bending top abutting plates 33 are respectively connected to the movable end of the bending hydraulic cylinder 31 through abutting rods 36, and when the flanges are bent, the two bending top abutting plates 33 abut against the inner sides of the two flanges of the hot-rolled H-shaped steel, and the bending hydraulic cylinder 31 moves downward to make the bending top abutting plates 33 bend the flanges outward by a certain angle.

[0096] Here, the bending hydraulic cylinder 31 is installed at a middle position on the top of the testing machine frame 1, and the two flattening top abutting mechanisms 4 are respectively installed on the two sides of the bending hydraulic cylinder 31 on the top of the testing machine frame 1, and after the flanges are bent outward, the bending hydraulic cylinder 31 moves upward to retract, and the two flattening top abutting mechanisms 4 press the two bent flanges downward to flatten the flanges to 90°.

[0097] The above only describes the preferred embodiments of the present application and is not used to limit the present application, and for those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for detecting 90° bend in the radius of a hot-rolled H-beam, characterized in that, Includes the following steps: Step 1: Take two or more hot-rolled H-beam samples from each batch according to the sampling inspection order, cut the samples to a length of L, and remove the cutting burrs. Step 2: Place the sample from Step 1 into a constant temperature or freezing container, and after the sample temperature drops to the set temperature, take out the sample and place it in the hot-rolled H-beam 90° radius bend test device. Step 3: Activate the hot-rolled H-beam 90° radius bend test device. Bend the hot-rolled H-beam flange outwards and flatten it to a 90° bend. The hot-rolled H-beam flange is placed vertically, and a top plate is used to press the hot-rolled H-beam flange outwards until it is bent and flattened to a 90° bend. The test device includes a channel-shaped base, a bending and pressing mechanism, and a flattening and pressing mechanism. The upper surface of the channel-shaped base has two parallel strip grooves. First, place the two flanges of the hot-rolled H-beam vertically in the strip grooves. Activate the bending and pressing mechanism to bend the hot-rolled H-beam flange outwards to about 45°. Then, drive the bending and pressing mechanism back to its original position and activate the flattening and pressing mechanism to continue applying pressure to the inclined flange until it is flat, thus achieving the 90° flange bend test. Step 4: Observe the fillet of the hot-rolled H-beam. If no visible cracks are found, the batch of hot-rolled H-beam is deemed to have passed the 90° bend test of the fillet. If visible cracks are found, the batch of hot-rolled H-beam is deemed to have failed the 90° bend test of the fillet.

2. The method for detecting 90° bend in the radius of a hot-rolled H-beam according to claim 1, characterized in that, In step two, the set temperature is one of the temperature values ​​between -40℃ and 20℃.

3. The method for detecting 90° bend in the radius of a hot-rolled H-beam according to claim 2, characterized in that, In step two, the set temperature is 20℃, 0℃, -20℃, or -40℃.

4. The method for detecting 90° bend in the radius of a hot-rolled H-beam according to claim 1, characterized in that, In step one, the length of the hot-rolled H-beam sample taken from each batch is 400-600mm, and the sample is cut to length L, where length L is 250-400mm.

5. The method for detecting 90° bend in the radius of a hot-rolled H-beam according to claim 4, characterized in that, In step one, the length of the hot-rolled H-beam sample taken from each batch is 500mm, and the sample is cut to length L, where length L is 300mm.

6. The method for detecting 90° bend in the radius of a hot-rolled H-beam according to claim 1, characterized in that, In step three, the bending and abutting mechanism simultaneously abuts against the inner side of the flanges on both sides of the hot-rolled H-beam, causing it to bend outward to about 45°. Then, the bending and abutting mechanism is driven back to its original position, and the two flattening and abutting mechanisms located on both sides of the hot-rolled H-beam are activated to continue to apply pressure to the inclined flanges until they are flat, thus achieving a 90° bending test of the flanges on both sides.

7. A device for detecting 90° bend in the radius of a hot-rolled H-beam, employing the detection method described in any one of claims 1-6, characterized in that, The test machine includes a frame, a grooved base, a bending and pressing mechanism, and a flattening and pressing mechanism. The grooved base is fixedly installed at the bottom of the test machine frame. The bending and pressing mechanism and the flattening and pressing mechanism are fixedly installed above the grooved base in the test machine frame. Two parallel strip grooves are formed on the upper surface of the grooved base.

8. The device for detecting 90° bend of hot-rolled H-beams according to claim 7, characterized in that, The hot-rolled H-beam also includes a web connecting two flanges. The width of the two strip grooves is equal to the thickness of the flanges of the hot-rolled H-beam. The depth of the two strip grooves is greater than or equal to the distance from the end of the flange on the hot-rolled H-beam to the plane of the web near the end of the flange. The distance between the two strip grooves is equal to the distance between the two flanges on the hot-rolled H-beam.

Images