A bending device for delayed cracking test specimen of high-strength automobile steel plate

Abstract

The present invention relates to a bending device for a delayed cracking test specimen of a high-strength automobile steel plate, and the technical field of metallurgical physical test equipment. The device comprises a bench vise, a bending fixture, and an adjustment clamp (20), wherein the bench vise comprises a fixed jaw (1), a movable jaw (2), a jaw shoulder (3), a bench vise handle (5), a jaw fixing frame (6), and a jaw screw (4); the bending fixture comprises a sleeve (13), an upper clamp block (10), a rotating shaft seat (36), and a lower clamp block (12); the adjustment clamp (20) comprises a clamp plate (40), a clamp plate table (39), an adjustment screw (21), a clamp plate clamp (22), a clamp plate clamp hole (23), an adjustment screw hole (24), and a sample clamp hole (25). The device of the present invention is simple and easy to operate, and can achieve the high-strength automobile steel plate delayed cracking test specimen to accurately reach a predetermined bending target value, thereby improving the test accuracy and reducing the test cost.

Description

Technical Field

[0001] The invention relates to a high-strength automobile steel plate delayed cracking test specimen bending device, and the technical field of metallurgical physical test equipment. Background Art

[0002] The lightweighting of automobiles requires that the proportion of high-strength steel in the car body gradually increases. When the strength of the steel plate reaches 1000MPa, the hydrogen-induced cracking sensitivity of the steel plate increases significantly. At present, the national standard method for detecting delayed cracking of steel plates has not yet been unified. The main test methods include constant strain test, low strain rate test, constant load test, etc. Among them, the constant strain test method mainly involves U-bend fracture test, three-point bending test, etc. This test method requires a certain pre-deformation of the steel plate. The specific measures are to punch holes at both ends of the sample, use a bending tester to process the steel plate, and bend the steel plate to a certain extent by moving the punch. After bending, the sample can be taken out, the screw rod is passed through the two holes, and then the bolt is tightened. During the tightening process, the sample will have a certain rebound. The bent sample is placed in an environment containing hydrogen, and the appearance of cracks on the surface of the sample is observed for a period of time. Since high-strength steel is relatively strong, the top pressure on high-strength steel is relatively high, which may cause slight damage to the surface of high-strength steel or high-strength steel coated plates. The bent specimens will have a certain rebound during the fixing process, which may affect the accuracy of the delayed cracking test results of high-strength steel plates to a certain extent. Therefore, it is necessary to research and develop a high-strength automotive steel plate delayed cracking test specimen bending device to achieve the high-strength steel plate specimen bending can accurately reach the predetermined target value, improve the test accuracy, and reduce the test cost. Summary of the invention

[0003] The purpose of the present invention is to develop a high-strength automobile steel plate delayed cracking test specimen bending device, so that the high-strength automobile steel plate specimen bending can accurately reach a predetermined target value, improve the test accuracy and reduce the test cost.

[0004] The technical solution of the present invention is:

[0005] A high-strength automobile steel plate delayed cracking test specimen bending device, including a bench vise, a bending fixture, and an adjustment clamp. The bench vise includes a fixed jaw, a movable jaw, a jaw shoulder, a bench vise handle, a jaw fixing frame, and a jaw screw. The movable jaw can move relative to the fixed jaw under the rotation and push of the bench vise handle. A right-angled jaw shoulder is provided on the upper half of the working surface opposite to the fixed jaw and the movable jaw. Two threaded holes are provided on the side of the jaw shoulder. The jaw fixing frame includes a frame plate I, a frame plate II, a fixed plate, and a connecting plate. The frame plate I, the frame plate II, the fixed plate, The connecting plate is a quadrilateral steel plate, which is bent to one side at a right angle to the fixed plate, and the two side edges of the frame plate I and frame plate II are bent upward at a right angle to the connecting plate. A small shaft rotation hole is provided on frame plate I, and a large shaft rotation hole is provided on frame plate II. The center lines of the small shaft rotation hole and the large shaft rotation hole are collinear. Two jaw fixing holes are provided on the fixed plate, and the positions of the two jaw fixing holes match the positions of the two threaded holes on the side of the jaw shoulder. The two jaw fixing frames are assembled with the two threaded holes on the side of the jaw shoulder through the jaw screws passing through the fixing holes. The two jaw fixing frames are assembled and fixed to the jaw shoulders of the fixed jaw and the movable jaw.

[0006] The bending fixture includes a sleeve, an upper clamping block, a rotating shaft seat, a lower clamping block, a rotating shaft, a clamping screw, a pressure plate, and a sleeve fixing screw. The sleeve is a cylindrical structural member with a notch on one side and a quadrilateral cross-section. Two sleeve fixing holes are respectively arranged on both sides of the notch, and a clamping screw hole is arranged on the side opposite to the notch. The upper clamping block and the lower clamping block are hexahedrons of the same shape. Four clamping block fixing screw holes are arranged on the lower clamping block. The positions and specifications of the clamping block fixing screw holes match the positions and specifications of the sleeve fixing holes. The rotating shaft seat is a hexahedron with an axial hole in the middle. The upper clamping block is fixedly connected to the rotating shaft seat. One side surface of the rotating shaft seat is on the same plane as the side surface of the upper clamping block. The rotating shaft is a cylindrical shaft. A small shaft with a diameter smaller than the rotating shaft is arranged at one end, and a small shaft with a diameter smaller than the rotating shaft is arranged at the other end. A square block-shaped shaft plug is provided, the diameter of the rotating shaft matches the inner diameter of the shaft hole and the large shaft rotating hole, the diameter of the small shaft matches the inner diameter of the small shaft rotating hole, the clamping screw is a screw with a through hole at the end, and a disc-shaped pressure plate is fixedly connected to the top of the screw, the lower clamping block is assembled in the sleeve, and the lower clamping block is fixedly assembled on the sleeve through the sleeve fixing screw and the clamping block fixing screw hole and the sleeve fixing hole, the upper clamping block is assembled in the sleeve, the clamping screw is assembled with the assembly clamping screw hole, and the pressure plate can push the upper clamping block to move to the lower clamping block through the rotation of the clamping screw, the rotating shaft passes through the large shaft rotating hole and is assembled in the shaft hole, and the small shaft is assembled in the small shaft rotating hole, and two sets of bending fixtures are provided, which are respectively assembled on the jaw fixing frames on both sides of the bench vise through the rotating shaft.

[0007] 4. The repairing kit for automotive dents, according to claim 1, wherein a bottom of the foot stand is provided with a toothed structure and the toothed structure is connected along the center of the foot stand to the vertical cam, and the toothed structure is connected along the bottom of the foot stand to the vertical cam.

[0008] The sum of the thickness of the upper clamping block and the lower clamping block is 8-10 mm smaller than the thickness of the inner cavity of the sleeve.

[0009] The outer circle radius of the clamping plate is 230-250 mm, the width of the clamping plate ring is 28-32 mm, and the circumference of the outer circle arc is 200-250 mm.

[0010] The thickness of the lower clamping block is 2-3 mm greater than the distance from the center line of the large shaft rotation hole to the upper surface of the connecting plate.

[0011] There are 4 to 8 clamping holes on each side of the splint, which are equidistantly arranged on the inner side of the arc edge of the splint.

[0012] There are 4 to 8 sample card holes, which are equidistantly arranged between the arc edges of the clamping plates.

[0013] The invention is advantageous in that the device is simple and easy to operate, and can achieve accurate bending of a high-strength automobile steel plate delayed cracking test specimen to a predetermined target value, thereby improving test accuracy and reducing test costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the device of the present invention;

[0015] Figure 2 It is a schematic diagram of the jaw fixing frame of the device of the present invention;

[0016] Figure 3 It is a schematic diagram of the assembly of the bending fixture and the jaw fixing frame of the device of the present invention;

[0017] Figure 4 It is a schematic diagram of the sleeve of the device of the present invention;

[0018] Figure 5 This is a schematic diagram of the lower clamping block of the device of the present invention;

[0019] Figure 6It is a schematic diagram of the clamping block and the rotating shaft seat of the device of the present invention;

[0020] Figure 7 A schematic diagram of a clamping screw and a pressing plate of the device of the present invention;

[0021] Figure 8 It is a schematic diagram of the assembly of the sleeve, lower clamping block and clamping screw of the device of the present invention;

[0022] Fig. 9 It is a schematic diagram of the rotating shaft of the device of the present invention;

[0023] Fig.10 It is a cross-sectional view of the assembly of the jaw fixing frame, the upper clamping block and the rotating shaft seat of the device of the present invention;

[0024] Fig.11 A schematic diagram of adjusting the splint of the device of the present invention;

[0025] Fig.12 It is a schematic diagram of the test sample, sample clamp and strain gauge;

[0026] Fig.13 A schematic diagram of the implementation state of the device of the present invention is provided;

[0027] Fig.14 This is a schematic diagram of the bending state of a specimen using a bench clamp in the device of the present invention;

[0028] Fig.15 It is a schematic diagram of the installation and adjustment of the clamping plate when the device of the present invention uses a bench clamp to implement sample bending;

[0029] Fig.16 It is a schematic diagram of the state when the device of the present invention uses an adjustment clamp to implement fine adjustment of the bending of the sample;

[0030] Fig.17 It is a schematic diagram of the state when the device of the present invention uses an adjusting clamp to implement the bending of the sample to reach a predetermined target value;

[0031] The markings in the figure are as follows: fixed jaw 1, movable jaw 2, jaw shoulder 3, jaw screw 4, bench vise handle 5, jaw fixing frame 6, jaw fixing hole 7, small shaft rotation hole 8, large shaft rotation hole 9, upper clamp block 10, shaft hole 11, lower clamp block 12, sleeve 13, clamping screw 14, sleeve fixing screw 15, clamp block fixing screw hole 16, sleeve fixing hole 17, clamping screw hole 18, pressure plate 19, adjustment clamp plate 20, adjustment screw 21, clamp plate clip 22, clamp plate clip hole 23, adjustment screw hole 24, sample clip hole 25, wrench 26, test sample 27, sample clip 28, rotating shaft 29, strain gauge 30, strain gauge 31, computer 32, frame plate I 33, frame plate II 34, fixed plate 35, rotating shaft seat 36, small shaft 37, shaft plug 38, clamping plate table 39, clamp plate 40, connecting plate 41.

[0032] Specific embodiments and methods

[0033] The present invention will be further described below by way of examples with reference to the accompanying drawings.

[0034] As shown in the accompanying drawings, a high-strength automobile steel plate delayed cracking test specimen bending device includes a bench vise, a bending fixture, and an adjustment clamp 20. The bench vise includes a fixed jaw 1, a movable jaw 2, a jaw shoulder 3, a bench vise handle 5, a jaw fixing frame 6, and a jaw screw 4. The movable jaw 2 can move relative to the fixed jaw 1 under the rotation and push of the bench vise handle 5. A right-angled jaw shoulder 3 is provided on the upper half of the working surface opposite to the fixed jaw 1 and the movable jaw 2. Two threaded holes are provided on the side of the jaw shoulder 3. The jaw fixing frame 6 includes a frame plate I 33, a frame plate II 34, a fixed plate 35, and a connecting plate 41. The frame plate I 33, the frame plate II 34, the fixed plate 35, and the connecting plate 41 are quadrilateral steel plates. The connecting plate 41 is bent to one side at a right angle to the fixed plate 35, and the two side edges of the frame plate I 33, the frame plate II 34, and the connecting plate 41 are bent upward at a right angle A small shaft rotation hole 8 is provided on the frame plate I 33, and a large shaft rotation hole 9 is provided on the frame plate II 34. The center lines of the small shaft rotation hole 8 and the large shaft rotation hole 9 are collinear. Two jaw fixing holes 7 are provided on the fixing plate 35. The positions of the two jaw fixing holes 7 match the positions of the two threaded holes on the side of the jaw shoulder 3. The jaw screws 4 pass through the fixing holes 7 and are assembled with the two threaded holes on the side of the jaw shoulder 3. Two jaw fixing frames 6 are assembled and fixed on the jaw shoulders 3 of the fixed jaw 1 and the movable jaw 2.

[0035] The bending fixture includes a sleeve 13, an upper clamping block 10, a rotating shaft seat 36, a lower clamping block 12, a rotating shaft 29, a clamping screw 14, a pressure plate 19, and a sleeve fixing screw 15. The sleeve 13 is a cylindrical structural member with a notch on one side and a quadrilateral cross-section. Two sleeve fixing holes 17 are respectively arranged on both sides of the notch, and a clamping screw hole 18 is arranged on the opposite side of the notch. The upper clamping block 10 and the lower clamping block 12 are hexahedrons of the same shape. Four clamping block fixing screw holes 16 are arranged on the lower clamping block 12. The positions and specifications of the clamping block fixing screw holes 16 match the positions and specifications of the sleeve fixing holes 17. The rotating shaft seat 36 is a hexahedron with an axial hole 11 in the middle. The upper clamping block 10 is fixedly connected to the rotating shaft seat 36. One side of the rotating shaft seat 36 is on the same plane as the side of the upper clamping block 10. The rotating shaft 29 is a cylindrical shaft, one end of which is provided with a small shaft 37 with a diameter smaller than the rotating shaft 29, and the other end is provided with a small shaft 37 with a diameter smaller than the rotating shaft 29. A square block-shaped shaft plug 38 is provided, the diameter of the rotating shaft 29 matches the inner diameter of the shaft hole 11 and the large shaft rotating hole 9, the diameter of the small shaft 37 matches the inner diameter of the small shaft rotating hole 8, the clamping screw 14 is a screw with a through hole at the end, and a disc-shaped pressing plate 19 is fixedly connected to the top of the screw. The lower clamping block 12 is assembled in the sleeve 13, and the sleeve fixing screw 15 is assembled with the clamping block fixing screw hole 16 and the sleeve fixing hole 17 to fix the lower clamping block 1 2 is fixedly assembled on the sleeve 13, the upper clamping block 10 is assembled in the sleeve 13, the clamping screw 14 is assembled with the assembly clamping screw hole 18, the pressing plate 19 can push the upper clamping block 10 to move toward the lower clamping block 12 through the rotation of the clamping screw 14, the rotating shaft 29 passes through the large shaft rotating hole 9 and is assembled in the shaft hole 11, the small shaft 37 is assembled in the small shaft rotating hole 8, and the bending fixture is provided with two sets, which are respectively assembled on the jaw fixing frames 6 on both sides of the bench vise through the rotating shaft 29.

[0036] The adjustment clamping plate 20 includes a clamping plate 40, a clamping plate platform 39, an adjustment screw 21, a clamping plate clip 22, a clamping plate hole 23, an adjustment screw hole 24, and a sample hole 25. The clamping plate 40 is a circular ring segment, and the clamping plate platform 39 is a hexahedral component. The clamping plate platform 39 is vertically fixedly connected to an end face of one side of the clamping plate 40. The center of the clamping plate platform 39 is provided with an adjustment screw hole 24. The clamping plate hole 23 and the sample hole 25 are long strip holes. The clamping plate hole 23 is provided on both sides of the arc of the clamping plate 40 along the circumference direction of the arc. The sample card hole 25 is arranged along the radius direction of the arc, the splint clip 22 is a long strip-shaped protrusion, the shape of the splint clip 22 matches the shape of the splint card hole 23, there are two splint clips 22, the position of the splint clip 22 matches the position of the splint card hole 23, the adjustment screw 21 is a screw with a through hole at the end, and is assembled with the adjustment screw hole 24, the adjustment splint 20 has two sets, and the splint clip 22 on each set of adjustment splints 20 is assembled in the splint card hole 23 on the other set of adjustment splints 20.

[0037] The sum of the thickness of the upper clamping block 10 and the lower clamping block 12 is 18 mm less than the inner cavity thickness of the sleeve 13. The outer circle radius of the clamping plate 40 is 240 mm, the ring width of the clamping plate 40 is 30 mm, and the circumference of the outer circle arc is 240 mm.

[0038] The thickness of the lower clamp block 12 is 6 mm greater than the distance from the center line of the large shaft rotation hole 9 to the upper surface of the connecting plate 41. There are 6 clamping plate holes 23 on each side, which are equidistantly arranged on the inner side of the arc edge of the clamping plate 40. There are 6 sample clamping holes 25, which are equidistantly arranged between the arc edges of the clamping plate 40.

[0039] Example:

[0040] Taking the newly quenched T1500HS steel plate as an example, when the high-strength automobile steel plate delayed cracking test specimen is bent, the production steps are as follows:

[0041] 1. Processing and manufacturing test sample 27: Cut the steel plate into an outer dimension of 230×30mm, and extend a pair of 8*5mm clips 28 on both sides at 60mm from one end, with a tolerance of ±1mm. Install the strain gauge 30 in the middle of the test sample 27, connect and debug the strain gauge 31 and computer 32 to prepare for the test.

[0042] 2. Install the bench vise and bending fixture: Turn the bench vise handle 5 to open the bench vise by more than 250mm, pass the jaw screw 4 through the fixing hole 7 and assemble it with the two threaded holes on the side of the jaw shoulder 3, and assemble and fix the two jaw fixing frames 6 on the jaw shoulders 3 of the fixed jaw 1 and the movable jaw 2. Assemble the two sets of bending fixtures on the jaw fixing frames 6 on both sides of the bench vise through the rotating shaft 29 respectively.

[0043] 3. Install the test sample 27: Turn the clamping screws 14 on both sides to adjust the gap between the upper clamp block 10 and the lower clamp block 12 to be slightly larger than the thickness of the test sample 27. Insert one end of the test sample 27 between the upper clamp block 10 and the lower clamp block 12 on one side of the fixed jaw 1, with the top of the test sample 27 contacting the root of the upper clamp block 12, and align the other end of the test sample 27 between the upper clamp block 10 and the lower clamp block 12 on one side of the movable jaw 2. Turn the bench vise handle 5 to insert the other end of the test sample 27 between the upper clamp block 10 and the lower clamp block 12 on one side of the movable jaw 2, as shown in the figure. Figure 6 Continue to rotate the vise handle 5 until both ends of the test sample 27 contact the roots of the upper clamping blocks 10 on both sides, and use the wrench 26 to rotate the clamping screw 14 to tighten the test sample 27.

[0044] 4. Sample bending:

[0045] Turn the vise handle 5 to clamp the vise. At this time, due to the gap between the test sample 27 and the rotating shafts 29 on both sides, an upward torque is generated when tightening, forcing the test sample 27 to bend upward. At the same time, observe the deformation reading of the strain gauge 31. When the deformation is close to the test requirement, stop the operation.

[0046] Take two adjustment clamps 20, align the sample clamp hole 23 at the root of one adjustment clamp 20 with the sample clamp 28, install the adjustment screw 21 on the other adjustment clamp 20 and install it on the other side of the bent test sample 27, align the clamp clamp 28 with the clamp clamp hole 23 on the opposite side closest to the test sample 27, and assemble and install the two adjustment clamps 20 tightly against both sides of the test sample 27. Turn the adjustment screw 21 until the top of the adjustment screw 21 presses against the surface of the test sample 27. At this time, clamp the clamp clamps 22 of the adjustment clamps 20 on both sides into the clamp clamp holes 23, confirm that the adjustment clamps 20 on both sides are locked, loosen the tightening screws 14 on both sides with the wrench 26, and remove the test sample 27 with the adjustment clamps 20 installed as a whole.

[0047] Hold the test sample 27 and use the wrench 26 to rotate the adjustment screw 21 to make the test sample 27 continue to bend, and observe the deformation reading of the computer 32 until the deformation reaches the test requirement.

[0048] The strain gauge was removed and the fabricated test specimen 27 was subjected to a delayed cracking test.

[0049] The device has a simple structure and is easy to operate, and can enable a high-strength automobile steel plate delayed cracking test specimen to accurately reach a predetermined target bending value, thereby improving test accuracy and reducing test costs.

Claims

1. A high-strength automobile steel plate delayed cracking test specimen bending device, characterized in that The bench vise comprises a bending fixture and an adjustment clamp (20). The bench vise comprises a fixed jaw (1), a movable jaw (2), a jaw shoulder (3), a bench vise handle (5), a jaw fixing frame (6), and a jaw screw (4). The movable jaw (2) can move relative to the fixed jaw (1) when the bench vise handle (5) is rotated and pushed. A right-angled jaw shoulder (3) is provided on the upper half of the working surface opposite to the movable jaw (2), and two threaded holes are provided on the side of the jaw shoulder (3). The jaw fixing frame (6) includes a frame plate I (33), a frame plate II (34), a fixing plate (35), and a connecting plate (41). The frame plate I (33), the frame plate II (34), the fixing plate (35), and the connecting plate (41) are quadrilateral steel plates. The connecting plate (41) and the fixing plate (35) are bent to one side at a right angle, and the two sides of the frame plate I (33), the frame plate II (34) and the connecting plate (41) are bent upward at a right angle. The frame plate I (33) is provided with a small shaft rotation hole (8), the frame plate II (34) is provided with a large shaft rotation hole (9), the center lines of the small shaft rotation hole (8) and the large shaft rotation hole (9) are collinear, the fixed plate (35) is provided with two jaw fixing holes (7), the positions of the two jaw fixing holes (7) match the positions of the two threaded holes on the side of the jaw shoulder (3), the jaw screws (4) pass through the fixing holes (7) and are assembled with the two threaded holes on the side of the jaw shoulder (3), and the two jaw fixing frames (6) are assembled and fixed on the jaw shoulders (3) of the fixed jaw (1) and the movable jaw (2); The bending fixture comprises a sleeve (13), an upper clamping block (10), a rotating shaft seat (36), a lower clamping block (12), a rotating shaft (29), a clamping screw (14), a pressure plate (19), and a sleeve fixing screw (15). The sleeve (13) is a cylindrical structural member with a notch on one side and a quadrilateral cross section. Two sleeve fixing holes (17) are respectively arranged on both sides of the notch, and a clamping screw hole (18) is arranged on the side opposite to the notch. The upper clamping block (10) and the lower clamping block (12) are hexahedrons of the same shape. The lower clamping block (13) is a cylindrical structural member with a notch on one side and a quadrilateral cross section. Two sleeve fixing holes (17) are respectively arranged on both sides of the notch, and a clamping screw hole (18) is arranged on the side opposite to the notch. The upper clamping block (10) is provided with four clamping block fixing screw holes (16), the positions and specifications of the clamping block fixing screw holes (16) match the positions and specifications of the sleeve fixing holes (17), the shaft seat (36) is a hexahedron, the middle of which is provided with an axial hole (11), the upper clamping block (10) is fixedly connected to the shaft seat (36), a side surface of the shaft seat (36) and a side surface of the upper clamping block (10) are on the same plane, the shaft (29) is a cylindrical shaft, one end of which is provided with a small shaft (37) having a diameter smaller than that of the shaft (29), and the other end of which is provided with a square The block-shaped shaft plug (38) has a diameter that matches the inner diameter of the shaft hole (11) and the large shaft rotating hole (9), and a diameter of the small shaft (37) matches the inner diameter of the small shaft rotating hole (8). The clamping screw (14) is a screw with a through hole at the end, and a disc-shaped pressing plate (19) is fixedly connected to the top of the screw. The lower clamping block (12) is assembled in the sleeve (13), and the sleeve fixing screw (15) is assembled with the clamping block fixing screw hole (16) and the sleeve fixing hole (17) to fix the lower clamping block (12). The upper clamping block (10) is mounted on the sleeve (13), the clamping screw (14) is mounted on the assembly clamping screw hole (18), the pressure plate (19) can push the upper clamping block (10) to move toward the lower clamping block (12) by rotating the clamping screw (14), the rotating shaft (29) passes through the large shaft rotating hole (9) and is mounted in the shaft hole (11), the small shaft (37) is mounted in the small shaft rotating hole (8), and the bending fixture is provided in two sets, which are respectively mounted on the jaw fixing frames (6) on both sides of the bench vise through the rotating shaft (29); The adjustment clamping plate (20) comprises a clamping plate (40), a clamping plate platform (39), an adjustment screw (21), a clamping plate clamp (22), a clamping plate clamping hole (23), an adjustment screw hole (24), and a sample clamping hole (25). The clamping plate (40) is a circular ring segment, and the clamping plate platform (39) is a hexahedral component. The clamping plate platform (39) is vertically fixedly connected to an end surface of one side of the clamping plate (40). An adjustment screw hole (24) is arranged at the center of the clamping plate platform (39). The clamping plate clamping hole (23) and the sample clamping hole (25) are long strip-shaped holes. The clamping plate clamping hole (23) is arranged on both sides of the arc of the clamping plate (40) along the circumference of the arc. The sample clamp hole (25) is arranged along the arc radius direction, the clamp clip (22) is a long strip protrusion, the shape of the clamp clip (22) matches the shape of the clamp clip hole (23), there are two clamp clips (22), the position of the clamp clip (22) matches the position of the clamp hole (23), the adjustment screw rod (21) is a screw rod with a through hole at the end, and is assembled with the adjustment screw hole (24), the adjustment clamp plate (20) has two sets, and the clamp clip (22) on each set of adjustment clamp plates (20) is assembled in the clamp hole (23) on the other set of adjustment clamp plates (20).

2. The high-strength automobile steel plate delayed cracking test specimen bending device according to claim 1, characterized in that The sum of the thickness of the upper clamping block (10) and the lower clamping block (12) is 8-10 mm smaller than the thickness of the inner cavity of the sleeve (13).

3. The high-strength automobile steel plate delayed cracking test specimen bending device according to claim 1, characterized in that The outer circle radius of the clamping plate (40) is 230-250 mm, the ring width of the clamping plate (40) is 28-32 mm, and the circumference of the outer circle arc is 200-250 mm.

4. The high-strength automobile steel plate delayed cracking test specimen bending device according to claim 1, characterized in that The thickness of the lower clamping block (12) is 2-3 mm greater than the distance from the center line of the large shaft rotation hole (9) to the upper surface of the connecting plate (41).

5. The high-strength automobile steel plate delayed cracking test specimen bending device according to claim 1, characterized in that There are 4 to 8 clamping holes (23) on each side of the clamping plate, which are equidistantly arranged on the inner side of the arc edge of the clamping plate (40).

6. The high-strength automobile steel plate delayed cracking test specimen bending device according to claim 1, characterized in that There are 4 to 8 sample card holes (25) which are equidistantly arranged between the arc edges of the clamping plate (40).

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