CN115586082A - Hot-rolled H-shaped steel r-fillet bending 90-degree detection method and device - Google Patents
Hot-rolled H-shaped steel r-fillet bending 90-degree detection method and device Download PDFInfo
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Abstract
The invention discloses a method and a device for detecting the r-fillet bending 90 degrees of hot-rolled H-shaped steel, belonging to the technical field of hot-rolled H-shaped steel testing, wherein more than two sections of hot-rolled H-shaped steel samples are taken from each batch according to sampling inspection sequence, are put into a constant temperature or freezing container, are taken out and are placed into a hot-rolled H-shaped steel r-fillet bending 90 degrees testing device after the temperature of the samples is reduced to a set temperature; bending and flattening the flange of the hot-rolled H-shaped steel outwards to bend 90 degrees; observing the r round angle of the hot-rolled H-shaped steel, and judging that the batch of test is qualified if no visible crack exists; and if the visible cracks exist, judging that the batch of tests is unqualified. The test method for bending the r-fillet of the hot-rolled H-shaped steel by 90 degrees is simple and easy to use, and can simulate the safety performance of the steel structure hot-rolled H-shaped steel in service at different environmental temperatures, so that the hidden defect of a weak link at the r-fillet where the stress of the hot-rolled H-shaped steel is most concentrated is detected, and meanwhile, the labor cost and the material cost are saved.
Description
Technical Field
The invention relates to the technical field of hot-rolled H-shaped steel testing, in particular to a method and a device for detecting the r-fillet bending of hot-rolled H-shaped steel by 90 degrees.
Background
The modern building industry develops towards the construction of environment-friendly, low-carbon and safe-in-service high-performance steel structures, and the hot-rolled H-shaped steel belongs to high-efficiency and economical building steel and has huge development space. The hot-rolled H-shaped steel is usually used for important purposes such as large bridges and high-rise buildings with large bearing capacity and good section stability, has good bending resistance, torsion resistance and compression resistance in the aspect of safety service reliability of the hot-rolled H-shaped steel, and puts higher requirements on the toughness and ductility of the hot-rolled H-shaped steel.
In the prior art, impact energy tests and 180-degree bending tests are used for detecting the impact toughness and the cold bending process performance of hot-rolled H-shaped steel, the impact energy tests and the 180-degree bending tests need to longitudinally sample on the flange of the hot-rolled H-shaped steel along the rolling direction, then delicate samples needed by the tests are manufactured on a sampling machine tool, and then the tests are respectively carried out on an impact energy testing machine and a hydraulic bending testing machine, and the defects are that: (1) The time consumption is long, the work of detection personnel is complicated, and the test cost is high; (2) The r fillet position which is concentrated aiming at the stress of the hot-rolled H-shaped steel product is not detected, wherein the r fillet is the intersection of the flange and the web of the hot-rolled H-shaped steel, and the safety service performance of the steel member manufactured by the whole hot-rolled H-shaped steel is influenced by the internal defects such as steel inclusion, sharp crack tip stress concentration and the like at the position.
Disclosure of Invention
In order to solve the problem that the r fillet with concentrated stress of a hot-rolled H-shaped steel product is not detected in the prior art, so that the evaluation on the safety service performance of a steel member manufactured by the hot-rolled H-shaped steel is incomplete, the invention provides a method for detecting the bending of the r fillet of the hot-rolled H-shaped steel by 90 degrees, which comprises the following steps:
taking more than two sections of hot-rolled H-shaped steel samples from each batch according to a sampling inspection sequence, respectively cutting the samples to a length of L, and removing cutting burrs;
step two, placing the sample obtained in the step one into a constant temperature or freezing container, taking out the sample after the temperature of the sample is reduced to a set temperature, and placing the sample into a hot-rolled H-shaped steel r-fillet 90-degree bending test device;
starting a hot-rolled H-shaped steel r-fillet 90-degree bending test device, and bending and flattening the flange of the hot-rolled H-shaped steel outwards to bend 90 degrees;
step four, observing the r round corner of the hot-rolled H-shaped steel, and judging that the 90-degree bending test of the r round corner of the hot-rolled H-shaped steel of the batch is qualified if no visible crack is generated; and if the visible cracks are generated, judging that the r-fillet 90-degree bending test of the batch of hot-rolled H-shaped steel is unqualified.
The testing device is adopted to bend the r fillet of the hot-rolled H-shaped steel by 90 degrees, and then the testing device is used for detecting the reliability of the safety service of the hot-rolled H-shaped steel, is used as the supplement of the standard and the detection standard of the hot-rolled H-shaped steel at home and abroad, and is also used as the cleanliness evaluation basis for producing qualified intermediate product billets in the intermediate production process.
Preferably, in the second step, the set temperature is one of temperature values of-40 ℃ to 20 ℃.
Preferably, in the second step, the set temperature is 20 ℃, 0 ℃, minus 20 ℃ or minus 40 ℃.
Preferably, in the step one, the length of each batch of hot-rolled H-shaped steel sample is 400-600mm, and the samples are respectively cut to a length L, wherein the length L is 250-400mm.
Preferably, in the first step, the length of each hot-rolled H-shaped steel sample in each batch is 500mm, and the samples are respectively cut to a length L, wherein the length L is 300mm.
Preferably, in the third step, the flanges of the hot-rolled H-section steel are vertically placed, and the abutting plates are abutted against the flanges of the hot-rolled H-section steel to be outwardly abutted until the flanges are outwardly bent and flattened to be bent by 90 °.
Preferably, in the third step, test device includes the cell type base, bends the top and supports the mechanism and flatten the top and support the mechanism, the cell type base upper surface is formed with two parallel arrangement's bar groove, will hot rolling H shaped steel both sides edge of a wing vertical place the bar inslot, start to bend the top and support the mechanism and will hot rolling H shaped steel edge of a wing outwards supports and bends to near 45, then the drive is bent the top and is supported the mechanism and return the normal position to start flattening the top and support the mechanism and continue exerting pressure to level to the edge of a wing of slope, realize the crooked 90 test in edge of a wing.
Preferably, in the third step, the bending abutting mechanism abuts against the inner sides of flanges on two sides of the hot-rolled H-shaped steel simultaneously to enable the flanges to be abutted outwards and bent to be near 45 degrees, then the bending abutting mechanism is driven to return to the original position, two flattening abutting mechanisms on two sides of the hot-rolled H-shaped steel are started to continuously apply pressure to the inclined flanges respectively until the inclined flanges are flat, and the test that the flanges on two sides are bent for 90 degrees is realized.
The test method is simple and easy to use by adopting the 90-degree bending of the r fillet of the hot-rolled H-shaped steel, and can simulate the safety performance of the steel structure hot-rolled H-shaped steel in service at different environmental temperatures, so that the hidden defect of the weak link at the r fillet with the most concentrated stress of the hot-rolled H-shaped steel is detected, and meanwhile, the labor cost and the material cost are saved.
The invention also provides a device for detecting the r-fillet bending 90 degrees of the hot-rolled H-shaped steel, which comprises a tester frame, a groove-shaped base, a bending abutting mechanism and a flattening abutting mechanism by adopting the detection method, wherein the groove-shaped base is fixedly arranged at the bottom position in the tester frame, the bending abutting mechanism and the flattening abutting mechanism are fixedly arranged at the position above the groove-shaped base in the tester frame, and two strip-shaped grooves which are arranged in parallel are formed on the upper surface of the groove-shaped base.
The hot rolling H-shaped steel is placed in a strip-shaped groove on the groove-shaped base, the bending abutting mechanism and the flattening abutting mechanism are utilized to apply force to one flange in the hot rolling H-shaped steel in sequence, so that the flange is bent outwards from the r fillet and then flattened to be 90 degrees, and the purpose of the r fillet bending test is achieved.
Preferably, the width of each strip-shaped groove is equal to the thickness of the flange of the hot-rolled H-section steel, the depth of each strip-shaped groove is greater than or equal to the distance from the end of the flange on the hot-rolled H-section steel to the plane where the web plate is close to the end of the flange, and the distance between the two strip-shaped grooves is equal to the distance between the flanges on the two sides of the hot-rolled H-section steel.
Preferably, the bending abutting mechanism comprises a bending hydraulic cylinder, a hydraulic cylinder seat and a bending 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 axial direction of the hydraulic cylinder rotating shaft, and the bending abutting plate is fixedly installed on the movable end of the bending hydraulic cylinder.
Preferably, the telescopic direction of the movable end of the bending hydraulic cylinder is perpendicular to the length direction of the strip-shaped groove, and the axial direction of the rotating shaft of the hydraulic cylinder is the same as the length direction of the strip-shaped groove;
when the hot-rolled H-shaped steel is placed in the strip-shaped groove of the groove-shaped 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.
Preferably, when the bending abutting plate abuts against the flange of the hot-rolled H-shaped steel, an included angle between the telescopic direction of the movable end of the bending removing hydraulic cylinder and the horizontal plane is 30-60 degrees.
Preferably, the top of flattening supports the mechanism and supports the board including the pneumatic cylinder that flattens and pressing the flat top, the pneumatic cylinder fixed mounting that flattens is in test machine frame top, press the flat top to support board fixed mounting in the pneumatic cylinder expansion end that flattens, the vertical setting of the flexible direction of the pneumatic cylinder expansion end that flattens.
Preferably, the bending abutting mechanism is located at one side of one of the strip-shaped grooves far away from the other strip-shaped groove and is fixedly installed on one side of the tester frame; the flattening propping mechanism is arranged far away from the bending propping mechanism, the upper part of the strip-shaped groove is deviated from the position of one side of the bending propping mechanism.
Preferably, the horizontal distance between the lower end part of the flattening abutting mechanism and the strip-shaped groove is smaller than half of the flange length of the hot-rolled H-shaped steel.
During an actual bending test, the bending abutting mechanism can be moved to abut against the inner side of the flange of the hot-rolled H-shaped steel to enable the flange to be bent outwards to be near 45 degrees, then the bending abutting mechanism is retreated, and the flattening abutting mechanism is driven to abut against the inner side of the flange of the hot-rolled H-shaped steel downwards continuously to be bent to 90 degrees, namely, a flattening state. After the bending of 90 degrees, the r round corner of the hot-rolled H-shaped steel has no visible crack, and the 90-degree bending test of the r round corner of the hot-rolled H-shaped steel of the batch (heat) is qualified.
Preferably, the groove-shaped base comprises a fixed base and a movable base, the movable base is arranged 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; unable adjustment base and activity base upper surface are in on the coplanar, and the upper surface all is formed with the bar groove, are located the bar groove of unable adjustment base and activity base upper surface is parallel to each other, just base adjustment mechanism adjust the direction with bar groove length direction is perpendicular.
Here, adjust the distance of movable base for unable adjustment base according to hot rolling H shaped steel specification, make the distance between two bar grooves equal with the distance between the hot rolling H shaped steel two edges of a wing, place hot rolling H shaped steel in the bar groove on the cell type base again, utilize the flattening of bending top to support the mechanism and exert the effect to the edge of a wing that lies in on the unable adjustment base in the hot rolling H shaped steel, make the edge of a wing from r fillet department outside bend flattening to crooked 90, reach the purpose of r fillet bending test.
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, which is close to the movable base, and second adjusting holes penetrating through two opposite sides of the movable base are formed on the movable base at positions corresponding to the first adjusting hole; the horizontal adjusting rod penetrates through the second adjusting hole, 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.
Preferably, an adjusting seat body is fixedly installed on one side, close to the movable base, of the horizontal adjusting rod.
Preferably, an external thread is formed on a section of the outer circumferential surface of the horizontal adjusting rod, which is close to the fixed base, and an internal thread matched with the external thread is formed on the inner wall of the first adjusting hole.
Preferably, the base adjusting mechanism further comprises a positioning moving rod, a first positioning hole is formed in one side, close to the movable base, of the fixed base, a second positioning hole penetrating through two opposite sides of the movable base is formed in the position, corresponding to the first positioning hole, of the movable base, the positioning moving rod penetrates through the second positioning hole, and one end of the positioning moving rod is installed in the first positioning hole; the straight line of the positioning moving rod is parallel to the straight line of the horizontal adjusting rod.
Preferably, the bending abutting mechanism is fixedly installed on one side, far away from the fixed base, of the testing machine frame.
Preferably, when the bending jacking plate butts against the hot-rolled H-shaped steel flange on the fixed base, an included angle between the telescopic direction of the movable end of the bending removing hydraulic cylinder and the horizontal plane is 30-60 degrees.
Has the advantages that:
the technical scheme of the invention has the following beneficial effects:
(1) The hot rolling H-shaped steel is placed in a strip-shaped groove on the groove-shaped base, the bending abutting mechanism and the flattening abutting mechanism are utilized to apply force to one flange in the hot rolling H-shaped steel in sequence, so that the flange is bent outwards from the r fillet and then flattened to be 90 degrees, and the purpose of the r fillet bending test is achieved.
(2) The method has the advantages that the hot-rolled H-shaped steel detection is firstly provided, r fillet 90-degree bending detection is added, the method is a reliable guarantee for verifying and detecting the safety service of the section steel product, and meanwhile, the method is a supplement to the standards and detection standards of hot-rolled H-shaped steel products at home and abroad; the result of the detection method is also used as the cleanliness evaluation basis for producing qualified intermediate product billets by carrying out intermediate production procedures (steelmaking smelting, refining and continuous casting).
(3) The test method is simple and easy to use by adopting the 90-degree bending of the r fillet of the hot-rolled H-shaped steel, and can simulate the safety performance of the steel structure hot-rolled H-shaped steel in service at different environmental temperatures, so that the hidden defect of the weak link at the r fillet with the most concentrated stress of the hot-rolled H-shaped steel is detected, and meanwhile, the labor cost and the material cost are saved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a flow chart of the present invention for measuring the r-radius bend of a hot rolled H-section by 90 degrees;
FIG. 2 is a schematic view of the structure of the preferred hot-pressed H-shaped steel of the present invention;
FIG. 3 shows the case of r-fillet crack in the bending state of the hot-pressed H-section steel according to the preferred embodiment of the present invention;
FIG. 4 is a schematic front view of a 90 degree bend detection apparatus according to an embodiment of the present invention;
FIG. 5 is a schematic side view of a 90 degree bend detection apparatus according to one embodiment of the present invention;
FIG. 6 is a schematic front view of a 90-degree bending detection device according to a second embodiment of the present invention;
FIG. 7 is a schematic view of an internal structure of a base adjustment mechanism in a second embodiment of the present invention;
FIG. 8 is a first schematic front view of a 90 degree bend detection apparatus according to a third embodiment of the present invention;
fig. 9 is a schematic front view of a 90 ° bending detection apparatus according to a third embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
As shown in FIG. 1, the method for detecting the r-fillet bending of the hot-rolled H-shaped steel by 90 degrees comprises the following steps:
step S101, taking more than two sections of hot-rolled H-shaped steel samples from each batch according to a sampling inspection sequence, respectively cutting the samples to a length of L, and removing cutting burrs;
s102, placing the sample in the first step into a constant temperature or freezing container, taking out the sample after the temperature of the sample is reduced to a set temperature, and placing the sample into a hot-rolled H-shaped steel r-fillet 90-degree bending test device;
step S103, starting a hot-rolled H-shaped steel r-fillet 90-degree bending test device, and bending and flattening the flange of the hot-rolled H-shaped steel outwards to bend 90 degrees;
step S104, observing the r-round angle of the hot-rolled H-shaped steel, and judging that the r-round angle 90-degree bending test of the batch of hot-rolled H-shaped steel is qualified if no visible crack is generated; and if the visible cracks are generated, judging that the r-fillet 90-degree bending test of the batch of hot-rolled H-shaped steel is unqualified.
The test device is adopted to bend the r fillet of the hot-rolled H-shaped steel by 90 degrees, and then the test device is used for detecting the reliability of the safety service of the hot-rolled H-shaped steel, is used as the supplement of the standard and the detection standard of the hot-rolled H-shaped steel at home and abroad, and is also used as the cleanliness evaluation basis for producing qualified intermediate product billets in the intermediate production process.
In a preferred embodiment, in step S102, the set temperature is one of-40 ℃ to 20 ℃.
In a preferred embodiment, the set temperature is 20 ℃, 0 ℃, 20 ℃, or-40 ℃ in step S102.
In a preferred embodiment, in step S101, the length of each hot-rolled H-section steel sample in each batch is 400 to 600mm, and the samples are cut to length L, wherein the length L is 250 to 400mm.
In a preferred embodiment, in step S101, the length of each hot-rolled H-section steel sample is 500mm, and the samples are cut to length L, wherein the length L is 300mm.
In a preferred embodiment, in step S103, the flanges of the hot-rolled H-section steel are placed vertically, and are abutted outwards by the abutting plate until the flanges are bent outwards and flattened to be bent by 90 °.
As a preferred embodiment, in step S102, the testing device includes the cell type base, bends to push against the mechanism and flatten and push against the mechanism, the cell type base upper surface is formed with two parallel arrangement' S bar groove, and will vertical place the hot rolling H shaped steel both sides edge of a wing the bar inslot, start to bend to push against the mechanism will the hot rolling H shaped steel edge of a wing outwards pushes against and bends to near 45, then the drive is bent to push against the mechanism and is returned the normal position to start flattening to push against the mechanism and continue to exert pressure to leveling to the edge of a wing of slope, realize the crooked 90 test of edge of a wing.
In a preferred embodiment, in step S103, the bending abutting mechanisms simultaneously abut against the inner sides of the flanges on both sides of the hot-rolled H-section steel, so that the flanges are outwardly abutted and bent to about 45 °, and then the bending abutting mechanisms are driven to return to the original positions, and two flattening abutting mechanisms on both sides of the hot-rolled H-section steel are started to respectively continuously press the inclined flanges to be flat, so as to realize the test that the flanges on both sides are bent by 90 °.
The test method is simple and easy to use by adopting the 90-degree bending of the r fillet of the hot-rolled H-shaped steel, and can simulate the safety performance of the steel structure hot-rolled H-shaped steel in service at different environmental temperatures, so that the hidden defect of the weak link at the r fillet with the most concentrated stress of the hot-rolled H-shaped steel is detected, and meanwhile, the labor cost and the material cost are saved.
The following describes structures of several hot-rolled H-shaped steel r-fillet bending 90-degree detection devices, which can be used for r-fillet bending 90-degree tests.
The first embodiment is as follows:
as shown in fig. 2 to 5, hot rolling H shaped steel r fillet bending 90 detection device includes testing machine frame 1, cell type base 2, bends to push against mechanism 3 and flatten the top and support mechanism 4, cell type base 2 fixed mounting be in bottom position in the testing machine frame 1, bend to push against mechanism 3 with flatten the top and support mechanism 4 fixed mounting in the testing machine frame 1 interior 2 top positions of cell type base department, 2 upper surfaces of cell type base are formed with two parallel arrangement's bar groove 21.
The hot-rolled H-shaped steel 100 is placed in a strip-shaped groove on a groove-shaped base, and a bending abutting mechanism and a flattening abutting mechanism are utilized to sequentially exert force on one flange 101 in the hot-rolled H-shaped steel, so that the flange 101 is bent outwards from an r fillet 103 and then flattened to be bent to 90 degrees, and the purpose of an r fillet bending test is achieved.
The width of each of the two strip grooves 21 is equal to the thickness of the flange 101 of the hot-rolled H-shaped steel 100, the depth of each of the two strip grooves 21 is greater than or equal to the distance between the end part of the flange 101 on the hot-rolled H-shaped steel 100 and the plane where the web 102 is close to the end part of the flange 101, and the distance between the two strip grooves 21 is equal to the distance between the flanges 101 on the two sides of the hot-rolled H-shaped steel 100.
The bending abutting mechanism 3 comprises a bending hydraulic cylinder 31, a hydraulic cylinder seat 32 and a bending abutting plate 33, the hydraulic cylinder seat 32 is fixedly installed on one side of the testing machine frame 1, an installation beam 35 can be arranged on the side surface of the testing machine frame 1, and the hydraulic cylinder seat 32 is installed on the installation beam 35; the bending hydraulic cylinder 31 is connected to the hydraulic cylinder base 32 through a hydraulic cylinder rotating shaft 34 in a shaft mode and can rotate along the axial direction of the hydraulic cylinder rotating shaft 34, and the bending abutting plate 33 is fixedly installed on the movable end of the bending hydraulic cylinder 31.
The telescopic direction of the movable end of the bending hydraulic cylinder 31 is perpendicular to the length direction of the strip-shaped groove 21, and the axial direction of the hydraulic cylinder rotating shaft 34 is the same as the length direction of the strip-shaped groove 21;
when the hot-rolled H-shaped steel is placed in the strip-shaped groove of the groove-shaped 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.
When the bending abutting plate 33 abuts against the flange 101 of the hot-rolled H-shaped steel 100, the included angle between the telescopic direction of the movable end of the bending removing hydraulic cylinder 31 and the horizontal plane is 30-60 degrees.
Flattening top is supported mechanism 4 including the pneumatic cylinder 41 that flattens and flattening top and is supported board 42, the pneumatic cylinder 41 fixed mounting that flattens is in 1 top of test machine frame, it supports board 42 fixed mounting to press the flat top and is in the pneumatic cylinder 41 expansion end flattens, the vertical setting of pneumatic cylinder 41 expansion end flexible direction flattens.
The bending abutting mechanism 4 is positioned at one side of one strip-shaped groove 21 far away from the other strip-shaped groove 21 and is fixedly installed at one side of the tester frame 1; the flattening propping mechanism 4 is arranged far away from the bending propping mechanism 3, and the upper part of the strip-shaped groove 21 is deviated from the position of one side of the bending propping mechanism 3.
The horizontal distance between the lower end part of the flattening abutting mechanism 4 and the strip-shaped groove 21 is smaller than half of the length of the flange 101 of the hot-rolled H-shaped steel 100.
During an actual bending test, the bending abutting mechanism can be moved to abut against the inner side of the flange of the hot-rolled H-shaped steel to enable the flange to be bent outwards to be near 45 degrees, then the bending abutting mechanism is retreated, and the flattening abutting mechanism is driven to abut against the inner side of the flange of the hot-rolled H-shaped steel downwards continuously to be bent to 90 degrees, namely, a flattening state; after the bending of 90 degrees, the r round corner of the hot-rolled H-shaped steel has no visible crack, and the 90-degree bending test of the r round corner of the hot-rolled H-shaped steel of the batch (heat) is qualified.
In order to bend and flatten the entire flange 101, the length of the bending abutting plate 33 and the pressing abutting plate 42 is preferably greater than or equal to the length of the flange 101 in the length direction of the hot rolled H-section steel, but may be slightly smaller than the length of the flange 101 in the length direction of the hot rolled H-section steel.
In addition, in order to flatten the flange 101, the distance from the strip-shaped groove 21 to the two inner walls of the test machine frame 1 is greater than the distance from the bent section of the flange 101, and here, the distance from the strip-shaped groove 21 to the two inner walls of the test machine frame 1 is preferably greater than half of the total length of the flange 101.
The bending abutting mechanism 3 and the flattening abutting mechanism 4 can also adopt the same driving mechanism, and the flange is bent by 90 degrees from a vertical state to a horizontal state by driving the abutting plate abutting against the flange of the hot-rolled H-shaped steel to move along a curve track and continuously applying thrust and pressure to the side surface of the flange, so that the purpose of bending and flattening is achieved.
During an actual bending test, the bending and abutting mechanism can be moved to abut against the inner side of the flange of the hot-rolled H-shaped steel, so that the flange of the hot-rolled H-shaped steel is bent outwards to be near 45 degrees, then the bending and abutting mechanism is retracted, and the flattening and abutting mechanism is driven to abut against the inner side of the flange of the hot-rolled H-shaped steel downwards continuously to be bent to 90 degrees, namely, a flattening state. After the bending of 90 degrees, no visible crack is generated at the r-round corner of the hot-rolled H-shaped steel, and the qualification of the 90-degree bending test of the r-round corner of the hot-rolled H-shaped steel of the batch (heat) can be judged.
The second embodiment:
as shown in fig. 6 and 7, the hot-rolled H-section steel r fillet bending 90 ° detection device, wherein the groove-shaped base 2 is optimally designed to be able to place hot-rolled H-section steels of various specifications, specifically, the groove-shaped base 2 is designed to have an adjustable distance between two strip-shaped grooves 21 on the surface thereof, specifically, the groove-shaped base 2 comprises a fixed base 21 and a movable base 22, the movable base 22 is installed on one side of the fixed base 21 through a base adjustment mechanism 23 and adjusts the horizontal position of the movable base 22 relative to the fixed base 21; unable adjustment base 21 and activity base 22 upper surface are in on the coplanar, and the upper surface all is formed with strip groove 24, is located the strip groove of unable adjustment base 21 and activity base 22 upper surface is parallel to each other, just base adjustment mechanism 23 adjust the direction with 24 length direction in strip groove are perpendicular.
Here, the distance of the movable base relative to the fixed base is adjusted according to the specification of the hot-rolled H-shaped steel 100, 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 flange on the fixed base in the hot-rolled H-shaped steel is acted by a bending flattening propping mechanism, the flange is bent and flattened to be bent by 90 degrees from the r fillet to the outer side, and the purpose of the r fillet bending test is achieved.
The base adjusting mechanism 23 comprises a horizontal adjusting rod 231 and an adjusting handwheel 232, a first adjusting hole 211 is formed on one side of the fixed base 21 close to the movable base 22, and a second adjusting hole 221 penetrating through two opposite sides of the movable base 22 is formed on the movable base 22 at a position corresponding to the first adjusting hole 211; the horizontal adjustment rod 231 penetrates through the second adjustment hole 221, one end of the horizontal adjustment rod is installed in the first adjustment hole 211, and the other end of the horizontal adjustment rod is provided with the adjustment hand wheel 232.
An adjusting seat body 233 is fixedly arranged on one side of the horizontal adjusting rod 231 close to the movable base 22.
An external thread is formed on the outer circumferential surface of the horizontal adjusting rod 231 near one section of the fixed base, and an internal thread matched with the external thread is formed on the inner wall of the first adjusting hole 211.
The base adjusting mechanism 23 further includes a positioning moving rod 234, a first positioning hole 212 is formed on one side of the fixed base 21 close to the movable base 22, a second positioning hole 222 penetrating through two opposite sides of the movable base 22 is formed on 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 one end of the positioning moving rod is installed in the first positioning hole 212; the positioning moving rod 234 is located on a straight line parallel to the horizontal adjustment rod 231.
Here, the bending abutting mechanism 3 is fixedly installed on the side of the tester frame 1 away from the fixed base 21.
When the bending abutting plate 22 abuts against the flange 101 of the hot-rolled H-section steel 100 on the fixed base 21, the included angle between the extension direction of the movable end of the bending hydraulic cylinder 31 and the horizontal plane is 30-60 °.
When experimental, bend to push up and support mechanism 3 and install at 1 top intermediate position of test machine frame, two flatten the top and support mechanism 4 and install respectively at 1 top of test machine frame bend to push up and support mechanism 3 both sides, after the edge of a wing is bent to the outside, the optional 45 of bending here, bend to push up and support mechanism 3 upward movement withdrawal, two flatten the top and support mechanism 4 and flatten to crooked 90 with the edge of a wing that both sides were bent downwards. The horizontal positions of the bending abutting mechanism 3 and the two flattening abutting mechanisms 4 at the top of the tester frame 1 can be adjusted, namely, the distance between the movable base and the fixed base is adjusted according to the specification of the hot-rolled H-shaped steel 100, 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 abutting mechanism 3 is adjusted to be located in the middle of the two flanges 101 of the hot-rolled H-shaped steel 100, the bending flattening abutting mechanism is used for exerting force on the two flanges in the hot-rolled H-shaped steel, the flanges are bent and flattened to be bent to be 90 degrees from the r fillet to the outer side, and the purpose of the r fillet bending test is achieved.
Example three:
hot rolling H shaped steel r fillet bending 90 detection device, wherein test machine frame 1 and cell type base 2 structure all with embodiment one and embodiment two, the fifty percent discount is bent the top and is supported mechanism 3 and flatten the top and support mechanism 4 and adjust, carry out bending 90 simultaneously to the edge of a wing of hot rolling H shaped steel both sides experimental, as shown in fig. 8 and 9, specifically, bend the top and support mechanism 3 including bending pneumatic cylinder 31 and bend the top and support board 33, wherein bend the pneumatic cylinder 31 and install position department directly over the hot rolling H shaped steel web just the vertical downward flexibility of bending pneumatic cylinder 31 expansion end, two bend the top and support board 33 and support 36 hub connections through the top and be in bending pneumatic cylinder 31 expansion end, when bending the edge of a wing, two bend the top and support board 33 top and support the position of hot rolling H shaped steel both sides edge, bend pneumatic cylinder 31 downstream makes the top and support board 33 of bending bend the edge of a certain angle to the outside.
Here, the hydraulic cylinder 31 of bending is installed at the middle position of testing machine frame 1 top, and two are flattened and are pushed against mechanism 4 and install respectively at testing machine frame 1 top bend hydraulic cylinder 31 both sides, after the edge of a wing is bent to the outside, the hydraulic cylinder 31 of bending upward movement withdrawal, two are flattened and are pushed against mechanism 4 and flatten the edge of a wing that both sides were bent downwards to crooked 90.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A method for detecting r-fillet bending of 90 degrees of hot-rolled H-shaped steel is characterized by comprising the following steps:
taking more than two sections of hot-rolled H-shaped steel samples from each batch according to a sampling inspection sequence, respectively cutting the samples to a length of L, and removing cutting burrs;
step two, placing the sample in the step one into a constant temperature or freezing container, taking out the sample after the temperature of the sample is reduced to a set temperature, and placing the sample into a hot-rolled H-shaped steel r-fillet 90-degree bending test device;
starting a hot-rolled H-shaped steel r-fillet 90-degree bending test device, and bending and flattening the flange of the hot-rolled H-shaped steel outwards to bend 90 degrees;
observing the r-round angle of the hot-rolled H-shaped steel, and judging that the r-round angle 90-degree bending test of the batch of hot-rolled H-shaped steel is qualified if no visible crack is generated; and if the visible cracks are generated, judging that the r-fillet 90-degree bending test of the batch of hot-rolled H-shaped steel is unqualified.
2. The method for detecting r-fillet bending of 90 ° of hot-rolled H-section steel according to claim 1, wherein in the second step, the set temperature is one of-40 ℃ to 20 ℃.
3. The method for detecting r-fillet bending 90 ° of hot-rolled H-section steel according to claim 2, wherein in the second step, the set temperature is 20 ℃, 0 ℃, 20 ℃ or-40 ℃.
4. The method for detecting r-fillet bending of 90 ° of hot-rolled H-section steel according to claim 1, wherein in the first step, the length of each hot-rolled H-section steel sample in each batch is 400-600mm, and the samples are respectively cut to a length L, wherein the length L is 250-400mm.
5. The method for detecting r-radius bend 90 ° of hot-rolled H-shaped steel according to claim 4, wherein in the first step, the length of each hot-rolled H-shaped steel sample in each batch is 500mm, and the samples are respectively cut to a length L, wherein the length L is 300mm.
6. The method for detecting the r-fillet bending of 90 degrees of the hot-rolled H-section steel according to claim 1, wherein in the third step, the flanges of the hot-rolled H-section steel are vertically placed and are abutted outwards by an abutting plate until the flanges are bent outwards and flattened to be bent by 90 degrees.
7. The method for detecting the r-fillet bending 90 degrees of the hot-rolled H-shaped steel according to claim 6, characterized in that in the third step, the testing device comprises a groove-shaped base, a bending abutting mechanism and a flattening abutting mechanism, two strip-shaped grooves which are arranged in parallel are formed in the upper surface of the groove-shaped base, flanges on two sides of the hot-rolled H-shaped steel are vertically placed in the strip-shaped grooves, the bending abutting mechanism is started to outwards abut and bend flanges of the hot-rolled H-shaped steel to be near 45 degrees, then the bending abutting mechanism is driven to return to the original position, the flattening abutting mechanism is started to continuously apply pressure to the inclined flanges to be flat, and the 90-degree bending test of the flanges is realized.
8. The method for detecting the r-fillet bending 90 degrees of the hot-rolled H-section steel according to claim 7, wherein in the third step, the bending abutting mechanisms simultaneously abut against the inner sides of flanges on two sides of the hot-rolled H-section steel to enable the flanges to be outwardly abutted and bent to be about 45 degrees, then the bending abutting mechanisms are driven to return to the original positions, and two flattening abutting mechanisms on two sides of the hot-rolled H-section steel are started to continuously press inclined flanges to be flat respectively, so that the test that the flanges on two sides are bent by 90 degrees is realized.
9. The hot-rolled H-shaped steel r fillet bending 90-degree detection device adopts the detection method according to any one of claims 1-8, and is characterized by comprising a tester frame, a groove-shaped base, a bending abutting mechanism and a flattening abutting mechanism, wherein the groove-shaped base is fixedly installed at the bottom position in the tester frame, the bending abutting mechanism and the flattening abutting mechanism are fixedly installed in the tester frame at the position above the groove-shaped base, and two strip-shaped grooves which are arranged in parallel are formed in the upper surface of the groove-shaped base.
10. The device for detecting r-radius bend 90 ° of hot-rolled H-section steel according to claim 1, wherein the widths of the two strip grooves are equal to the thickness of the flange of the hot-rolled H-section steel, the depths of the two strip grooves are greater than or equal to the distance from the end part of the flange on the hot-rolled H-section steel to the plane where the web is close to the end part of the flange, and the distance between the two strip grooves is equal to the distance between the flanges on two sides of the hot-rolled H-section steel.
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| CN202211223411.8A CN115586082A (en) | 2022-10-08 | 2022-10-08 | Hot-rolled H-shaped steel r-fillet bending 90-degree detection method and device |
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