CN109283067B - A bidirectional shear test device for sheet metal - Google Patents
A bidirectional shear test device for sheet metal Download PDFInfo
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- CN109283067B CN109283067B CN201811069614.XA CN201811069614A CN109283067B CN 109283067 B CN109283067 B CN 109283067B CN 201811069614 A CN201811069614 A CN 201811069614A CN 109283067 B CN109283067 B CN 109283067B
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- 238000012360 testing method Methods 0.000 title claims abstract description 102
- 230000002457 bidirectional effect Effects 0.000 title claims abstract description 50
- 239000002184 metal Substances 0.000 title claims abstract description 23
- 238000010008 shearing Methods 0.000 claims abstract description 114
- 230000007246 mechanism Effects 0.000 claims abstract description 61
- 238000007906 compression Methods 0.000 claims abstract description 10
- 230000006835 compression Effects 0.000 claims abstract description 8
- 230000033001 locomotion Effects 0.000 claims abstract description 7
- 238000006073 displacement reaction Methods 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 15
- 230000008569 process Effects 0.000 claims description 14
- 239000003638 chemical reducing agent Substances 0.000 claims description 7
- 230000009471 action Effects 0.000 claims description 6
- 230000000694 effects Effects 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 12
- 230000008859 change Effects 0.000 description 3
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000005056 compaction Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000004590 computer program Methods 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
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- 238000006467 substitution reaction Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/24—Investigating strength properties of solid materials by application of mechanical stress by applying steady shearing forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0025—Shearing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/005—Electromagnetic means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/0202—Control of the test
- G01N2203/0208—Specific programs of loading, e.g. incremental loading or pre-loading
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/026—Specifications of the specimen
- G01N2203/0262—Shape of the specimen
- G01N2203/0278—Thin specimens
- G01N2203/0282—Two dimensional, e.g. tapes, webs, sheets, strips, disks or membranes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0676—Force, weight, load, energy, speed or acceleration
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0682—Spatial dimension, e.g. length, area, angle
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Abstract
本发明公开了一种金属板材双向剪切试验装置，包括伺服电机、减速机构、测量仪器、拉压剪切机构和旋转剪切机构。伺服电机为整个装置提供动力，驱动整个装置的运转；减速机构是为了将高速的电机转动转化为低速的剪切运动；测量仪器是为了测量试验过程中产生的作用力和变形；拉、压剪切机构和旋转剪切机构是整个试验装置的执行机构，是为了实现双向剪切试件两个方向的剪切变形。利用电机驱动能够实现双向剪切时，任意比例恒定的拉、压剪切变形和旋转剪切变形，提高试验试验结果的可靠性；通过驱动系统的正转和反转，实现金属板材的正反向剪切，从而更全面的研究材料性能。
The invention discloses a bidirectional shearing test device for a metal plate, which comprises a servo motor, a deceleration mechanism, a measuring instrument, a tension-compression shearing mechanism and a rotary shearing mechanism. The servo motor provides power for the whole device and drives the operation of the whole device; the deceleration mechanism is to convert the high-speed motor rotation into low-speed shear motion; the measuring instrument is to measure the force and deformation generated during the test; tension, compression shear The cutting mechanism and the rotating shearing mechanism are the actuators of the whole test device, which are used to realize the shear deformation of the bidirectional shear specimen in two directions. The use of motor drive can realize tension, compression shear deformation and rotational shear deformation at any proportion and constant during bidirectional shearing, which improves the reliability of test results; through the forward and reverse rotation of the drive system, the positive and negative of the metal plate can be realized. shearing, so as to study the material properties more comprehensively.
Description
Technical Field
The invention belongs to a test device, and relates to a test device for measuring the shearing performance of a metal plate, in particular to a bidirectional shearing test device for the metal plate.
Background
In recent years, in order to improve the utilization rate of materials as much as possible and to fully exert the material properties, some new material property testing methods are gradually adopted. The shear test of the metal plate has a large strain range, so that the shear test can be widely concerned for researching the behavior of a material with large strain. At present, a lot of test modes for shearing test and shear-containing test of metal plates exist, but the performance research of the plates in two-way shearing is less, and different deformation states have great influence on the material performance.
The invention discloses a Chinese patent with the publication number of CN108169036A, which is found by the document search of the prior art and has the following name: a mechanical sheet metal bidirectional shearing device can realize bidirectional shearing of a sheet metal and is used for researching the deformation behavior of the bidirectional shearing, but the deformation proportion between rotary shearing and press-down shearing of the device is fixed, different connecting rods need to be replaced if the deformation proportion is changed, the size of each connecting rod is required, and the device is high in cost and very inconvenient. In addition, in the test process, the proportion of the two deformation modes is not constant, and certain influence is caused on the test result. Meanwhile, the inner ring and the outer ring of the test piece are fixed by bolts, and after the inner ring is fixed, the bolts of the outer ring are inconvenient to install and easily slide relative to each other. The self-locking phenomenon can occur due to the use of the link mechanism, the maximum operation displacement in the test process can be influenced, and the method can not be used for researching the material performance of the material during circular shearing.
Disclosure of Invention
The technical problem to be solved is as follows:
in order to avoid the defects of the prior art, the invention provides the metal plate bidirectional shearing test device which can realize constant pulling, pressing, shearing deformation and rotary shearing deformation in any proportion during bidirectional shearing of the metal plate, and improve the reliability of a test result; through the forward rotation and the reverse rotation of the driving system, the tension-compression type shearing or forward-reverse rotation shearing of the metal plate is realized, so that the material performance is more comprehensively researched. The device has the advantages of simple process, convenient operation, low cost, short flow, high efficiency, convenience and the like, and is easy for large-scale industrial application.
The technical scheme of the invention is as follows: the utility model provides a two-way shear test device of sheet metal which characterized in that: the device comprises a servo motor, a speed reducing mechanism, a measuring instrument, a pulling and pressing shearing mechanism and a rotating shearing mechanism; the servo motors comprise two servo motors and are used for providing power to drive the test device to operate; the two speed reducing mechanisms are respectively connected with the two servo motors and are used for converting the rotation of the high-speed motor into low-speed shearing motion; the measuring instrument force sensor, the displacement sensor, the torque sensor and the angle sensor are used for measuring acting force and deformation generated in the test process; the pulling and pressing shearing mechanism and the rotating shearing mechanism are used for realizing the shearing deformation of the bidirectional shearing test piece with the circular plate-shaped structure in the axial direction and the circumferential direction;
the pulling and pressing shearing mechanism comprises a screw rod, a screw rod fixing seat, a movable support, a circular boss and a pressing block; two ends of the lead screw respectively penetrate through the two through holes in the lead screw fixing seat and are in clearance fit with the through holes, the lead screw fixing seat is used for supporting the lead screw, and one end of the lead screw is connected with one speed reducing mechanism; the movable support is provided with a threaded through hole which is matched with the thread of the lead screw; the speed reducing mechanism further drives the movable support to move by driving the lead screw to rotate, and the displacement sensor is mounted on the movable support and used for measuring the deformation displacement of the test piece; the movable support is fixedly provided with a force sensor, a movable support and a circular boss in sequence towards one end of the rotary shearing mechanism; the circular boss is of a cylindrical structure, one end of the circular boss is fixed on the movable support, and the other end of the circular boss penetrates through the step through hole in the pressing block to be coaxially and fixedly connected with the bidirectional shearing test piece; the compression block is of a columnar structure, the step through hole is positioned at the position of the central shaft, one end with a large aperture is in clearance fit with the bidirectional shearing test piece, and one end with a small aperture is sleeved on the circular boss;
one end of the rotary shearing mechanism is connected with the pressing block, and the other end of the rotary shearing mechanism is connected with the other speed reducing mechanism through a shaft; the rotary shearing mechanism comprises a bearing disc, a torque sensor, a rotary block and a bearing seat; the shaft penetrates through a bearing arranged in the through hole of the bearing seat, and the shaft is supported by the bearing; the shaft is provided with the angle sensor and is used for measuring a deformation corner generated in the rotary shear test process; one end of the rotating block is coaxially and fixedly connected with the shaft, and the other end of the rotating block is coaxially and sequentially fixedly connected with the torque sensor and the bearing disc; the bearing disc is of a hollow cylindrical structure with an opening at one end, the closed end of the bearing disc is connected with the torque sensor, the opening end of the bearing disc is of a flange disc structure, the inner diameter of the flange disc is smaller than the diameter of the bidirectional shearing test piece, and the outer diameter of the flange disc is larger than the diameter of the bidirectional shearing test piece;
the diameter of the circular boss is smaller than the inner diameter of the flange plate of the bearing plate; and the servo motor operates to move the movable support and further push the bidirectional shearing test piece, so that the bidirectional shearing test piece is coaxially contacted with the flange plate of the bearing plate, and then the pressing block and the bearing plate are coaxially fastened by using bolts.
The further technical scheme of the invention is as follows: coaxial annular grooves are formed in the same positions of two end faces of the bidirectional shearing test piece; the diameter of the circular boss is smaller than that of the inner wall of the groove; the diameter of one end of the small aperture of the pressing block is larger than that of the outer wall of the groove; the inner diameter of the flange plate of the bearing plate is larger than the diameter of the outer wall of the groove of the bidirectional shearing test piece.
The further technical scheme of the invention is as follows: the pulling and pressing shearing mechanism also comprises a guide rail and an acting support, and the acting support is fixed below the movable support and plays a supporting role; but movable support and effect support bottom all install slide rail or slider with the guide rail cooperation is used for reducing but movable support and movable support atress resistance when removing.
The further technical scheme of the invention is as follows: the movable support is of a U-shaped structure, one end side wall of the movable support is fixed with the force sensor, the other end side wall of the movable support is fixed with the circular boss, and the lower end face of the movable support is fixed with the action support.
The further technical scheme of the invention is as follows: the speed reducing mechanism comprises a speed reducer, a turbine worm pair, a base and a coupler, and is sequentially connected with the servo motor.
Advantageous effects
The invention provides a test device capable of measuring the shearing performance of a metal plate, aiming at the shearing performance of the metal plate. The invention has the beneficial effects that:
1. the bidirectional shearing test or the unidirectional shearing test of the metal plate can be simultaneously carried out through the motor drive, and the test is convenient and fast without replacing other equipment; the constant proportion of the pull-press type shear deformation and the rotary type shear deformation can be ensured;
2. the test piece can be subjected to a circulating shear test in a pulling state and a pressing state and a clockwise and anticlockwise rotating shear test by utilizing the forward rotation and the reverse rotation of the motor, so that the follow-up strengthening shear performance of the material can be researched;
3. the pull (press) and rotation bidirectional shearing test can be simultaneously carried out through the forward rotation and the reverse rotation of the motor, and the test is used for researching the follow-up strengthening shearing performance during bidirectional shearing;
4. when the motor is used for driving to carry out a shearing test, the downward-pressing type shearing deformation and the rotary type shearing deformation in any proportion can be realized, the limitation of the maximum deformation is avoided, and the reliability of the test result is improved;
5. the angle sensor is used for measuring the rotating angle, and the measuring result is more accurate than the triangular transformation by using the link mechanism in the prior art;
6. compared with the prior art that bolts are used for directly fixing, the structure that the pressing block and the bearing disc are used for pressing and fixing the bidirectional shearing test piece is more reliable, and relative displacement cannot occur;
7. the invention can change the deformation rate in the test by replacing different speed reducers or turbine worm pairs with different transmission ratios, thereby researching the influence of the deformation rate on the test performance.
Drawings
FIG. 1 is an overall schematic view of the present invention;
FIG. 2 is a schematic view of a reduction mechanism;
FIG. 3 is a schematic view of a pulling (pressing) shearing mechanism;
FIG. 4 is a schematic view of a rotation mechanism;
description of reference numerals: 1-a first servo motor; 2-a first reducer; 3-a first machine base; 4-a first coupling; 5-a first worm; 6-a first turbine; 7-a second coupling; 8-lead screw fixing seat; 9-fixing a bracket; 10-a displacement sensor; 11-displacement sensor holder; 12-a guide rail; 13-a slide block; 14-a movable support; 15-a lead screw; 16-a force sensor; 17-acting support; 18-a bearing seat; 19-a second worm; 20-a second stand; 21-an angle sensor; 22-a second turbine; 23-a second reducer; 24-a second motor; 25-axis; 26-a rotating block; 27-a torque sensor; 28-carrying tray; 29-bidirectional shearing of the test piece; 30-a compaction block; 31-round boss; 32-movable support.
Detailed Description
The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
Referring to fig. 1, the invention relates to a bidirectional shearing test device for a metal plate, which comprises a servo motor, a speed reducing mechanism, a measuring instrument, a pulling and pressing shearing mechanism and a rotating mechanism. The servo motor is used for providing power for the whole bidirectional shearing device, and positive and negative rotation of the servo motor can be realized through programming, so that pulling shearing or pressing shearing and rotary shearing deformation are carried out, and the positive and negative shearing performance of the material is researched. The bidirectional shearing test piece is of a circular plate-shaped structure, and coaxial annular grooves are formed in the same positions of two end faces of the bidirectional shearing test piece.
Since a small movement speed is required for the shear test, the deformation speed of the whole device, particularly the shear deformation speed, needs to be controlled. Referring to fig. 2, the speed reducing mechanism comprises a speed reducer, a turbine worm pair, a base and a coupler, the speed reducer is matched with the motor for use, the turbine worm with a proper transmission ratio is selected for further speed reduction, and the speed reducing mechanism is fixed on the test platform through the base.
The measuring instrument comprises a force sensor 16, a displacement sensor 10, an angle sensor 21 and a torque sensor 27, and is mainly used for measuring and recording force values, displacements, corners and torques generated in the shearing test process.
Referring to fig. 3, the pulling and pressing shear mechanism is an actuating mechanism of the whole device, and is used for realizing the shearing of the metal plate in one direction, and the specific pulling and pressing shear movement can be controlled by the positive rotation and the negative rotation of the servo motor. The pulling and pressing shearing mechanism comprises a guide rail 12, a sliding block 13, a lead screw 15, a lead screw fixing seat 8, a movable support 14, an acting support 17, a circular boss 31 and a pressing block 30. Wherein, the screw rod fixing seat 8, the guide rail 12 and the fixing bracket 9 are arranged on the test platform and used for fixing the whole mechanism. One end of the pulling and pressing shearing mechanism is connected with the second coupler 7, and the other end of the pulling and pressing shearing mechanism is connected with one end of the rotary shearing mechanism; two ends of the screw rod 15 respectively penetrate through the two through holes in the screw rod fixing seat 8 and are in clearance fit with the through holes, the screw rod fixing seat 8 is used for supporting the screw rod, and one end of the screw rod is connected with the second coupler 7; the movable support 14 is provided with a threaded through hole which is matched with the thread of the lead screw 15; the speed reducing mechanism further drives the movable support 14 to move by driving the screw rod 15 to rotate, the displacement sensor 10 is arranged on the movable support 14 through the displacement sensor fixing frame 11, and the displacement generated in the pulling and pressing shearing processes is measured through the change of the relative distance between the displacement sensor 10 and the fixing support 9; the movable support 14 is fixedly provided with a force sensor 16, a movable bracket 32 and a circular boss 31 in sequence towards one end of the rotary shearing mechanism, and the force sensor 16 is used for measuring the tensile force or the pressure in the test process. The circular boss 31 is of a cylindrical structure, one end of the circular boss is fixed on the movable support 32, and the other end of the circular boss penetrates through the step through hole in the pressing block 30 and is coaxially and fixedly connected with the bidirectional shearing test piece 29; the compression block 30 is of a columnar structure, the step through hole is located at the position of the central shaft, one end with a large aperture is in clearance fit with the outer peripheral surface of the bidirectional shearing test piece 29 and used for limiting the radial movement of the bidirectional shearing test piece 29, and one end with a small aperture is sleeved on the circular boss. The diameter of the circular boss 31 is smaller than that of the inner wall of the groove of the bidirectional shearing test piece; the diameter of one end of the pressing block 30 with small aperture is larger than the diameter of the outer wall of the groove of the bidirectional shearing test piece.
The action support 17 is fixed below the movable bracket 32 and plays a supporting role; the movable support 14 and the action support 17 are provided with sliding blocks 13 at the bottoms thereof, and the sliding blocks are matched with the guide rails 12 and used for reducing resistance from the test platform when the action support 17 and the movable support 32 move. The movable support 32 is of a U-shaped structure, one end side wall of the movable support is fixed with the force sensor, the other end side wall of the movable support is fixed with the circular boss 31, the lower end face of the movable support is fixed with the action support 17, and the structure is used for guaranteeing coaxiality during installation and transmitting load in the process of tension and compression shear tests, so that the force sensor can measure more accurately.
Referring to fig. 4, the rotating mechanism is another actuator of the whole device, one end of which is connected with the pressing block 30, and the other end of which is connected with another speed reducing mechanism through a shaft 25; comprises a bearing disc 28, a torque sensor 27, a rotating block 26 and a bearing seat 18; the bearing block 18 is arranged on the test platform, the shaft passes through a bearing arranged in the through hole of the bearing block, and the shaft is supported by the bearing; the bearing block 18 is used for coaxial fixation of the whole rotating mechanism. One end of the shaft 25 is connected with the angle sensor 21, when the rotary shear deformation is carried out, the shaft 25 can rotate, and the angle sensor 21 can measure the angle change in the test process. Rotatory piece 26 one end and the coaxial fixed connection of axle 25, the other end and the coaxial fixed connection of torque sensor 27 to pass through the key-type connection with axle 25, the rotation through axle 25 drives the rotation of rotatory piece 26, thereby makes whole rotary mechanism carry out the rotation type to two-way shearing test piece 29 and shear. The bearing disc 28 is of a hollow cylindrical structure with an opening at one end, the closed end of the bearing disc is coaxially and fixedly connected with the torque sensor 27, the opening end of the bearing disc is of a flange disc structure, and the inner diameter of the flange disc is smaller than the diameter of the bidirectional shearing test piece 29 and larger than the diameter of the outer wall of the groove of the bidirectional shearing test piece 29; the outer diameter of the flange plate is larger than the diameter of the bidirectional shearing test piece 29;
the diameter of the round boss 31 is smaller than the inner diameter of the flange plate of the bearing plate 28; the servo motor 1 is operated to move 32 the movable support to further push the two-way shear test piece 29, so that the two-way shear test piece 29 is coaxially contacted with the flange plate of the bearing plate 28, and then the pressing block 30 and the bearing plate 28 are coaxially fastened by using the bolt.
Before the test is started, the bidirectional shearing test piece 29 is fixed on the circular boss 31 through the bolt, the pressing block 30 penetrates through the circular boss 31, then the first servo motor 1 operates to enable the movable support 14 to move, the acting support 17 is pushed to move to enable the acting support to be close to the bearing disc 28, after the bidirectional shearing test piece 29 is contacted with the bearing disc 28, the pressing block 30 is used for pressing and fixing the bidirectional shearing test piece through the bolt, and therefore the bidirectional shearing test piece is installed. During the test, the servo motors for controlling the shearing in two directions are programmed, and the movement amount of the acting support 17 and the rotation amount of the shaft 25 are controlled by a computer program, so that the pulling and pressing shearing deformation and the rotating shearing deformation are controlled. The corresponding force sensor 16 and displacement sensor 10 measure the tension, pressure and displacement during the tension, compression shear deformation, and the angle sensor 21 and torque sensor 27 measure the rotation angle and torque during the rotation shear deformation. Through analyzing the measured value of the sensor, the feedback adjustment can be carried out on the shearing test process, so that the shearing quantity proportion of the two deformation directions in the test process is controlled to be kept constant, and the influence of different proportions of tension shearing, compression shearing and rotary shearing on the material performance is researched.
The bidirectional shear test piece 29 can also be in other plate-shaped structures, such as quadrangles, and the shape of the large-aperture end of the stepped through hole of the compaction block 30 is matched with the shape of the bidirectional shear test piece 29 and keeps clearance fit.
In addition, a motor can be independently used in the test, so that the pulling and pressing shear test or the rotating shear test can be independently carried out, and the coupling relation of the unidirectional shear and the bidirectional shear can be researched.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made in the above embodiments by those of ordinary skill in the art without departing from the principle and spirit of the present invention.
Claims (4)
1. The utility model provides a two-way shear test device of sheet metal which characterized in that: the device comprises a servo motor, a speed reducing mechanism, a measuring instrument, a pulling and pressing shearing mechanism and a rotating shearing mechanism; the servo motors comprise two servo motors and are used for providing power to drive the test device to operate; the two speed reducing mechanisms are respectively connected with the two servo motors and are used for converting the rotation of the high-speed motor into low-speed shearing motion; the measuring instrument comprises a force sensor, a displacement sensor, a torque sensor and an angle sensor and is used for measuring acting force and deformation generated in the test process; the pulling and pressing shearing mechanism and the rotating shearing mechanism are used for realizing the shearing deformation of the bidirectional shearing test piece with the circular plate-shaped structure in the axial direction and the circumferential direction;
the pulling and pressing shearing mechanism comprises a screw rod, a screw rod fixing seat, a movable support, a circular boss and a pressing block; two ends of the lead screw respectively penetrate through the two through holes in the lead screw fixing seat and are in clearance fit with the through holes, the lead screw fixing seat is used for supporting the lead screw, and one end of the lead screw is connected with one speed reducing mechanism; the movable support is provided with a threaded through hole which is matched with the thread of the lead screw; the speed reducing mechanism further drives the movable support to move by driving the lead screw to rotate, and the displacement sensor is mounted on the movable support and used for measuring the deformation displacement of the test piece; the movable support is fixedly provided with a force sensor, a movable support and a circular boss in sequence towards one end of the rotary shearing mechanism; the circular boss is of a cylindrical structure, one end of the circular boss is fixed on the movable support, and the other end of the circular boss penetrates through the step through hole in the pressing block to be coaxially and fixedly connected with the bidirectional shearing test piece; the compression block is of a columnar structure, the step through hole is positioned at the position of the central shaft, one end with a large aperture is in clearance fit with the bidirectional shearing test piece, and one end with a small aperture is sleeved on the circular boss;
one end of the rotary shearing mechanism is connected with the pressing block, and the other end of the rotary shearing mechanism is connected with the other speed reducing mechanism through a shaft; the rotary shearing mechanism comprises a bearing disc, a torque sensor, a rotary block and a bearing seat; the shaft penetrates through a bearing arranged in the through hole of the bearing seat, and the shaft is supported by the bearing; the shaft is provided with the angle sensor and is used for measuring a deformation corner generated in the rotary shear test process; one end of the rotating block is coaxially and fixedly connected with the shaft, and the other end of the rotating block is coaxially and sequentially fixedly connected with the torque sensor and the bearing disc; the bearing disc is of a hollow cylindrical structure with an opening at one end, the closed end of the bearing disc is connected with the torque sensor, the opening end of the bearing disc is of a flange disc structure, the inner diameter of the flange disc is smaller than the diameter of the bidirectional shearing test piece, and the outer diameter of the flange disc is larger than the diameter of the bidirectional shearing test piece;
the diameter of the circular boss is smaller than the inner diameter of the flange plate of the bearing plate; the servo motor operates to enable the movable support to move and further push the bidirectional shearing test piece, so that the bidirectional shearing test piece is coaxially contacted with the flange plate of the bearing disc, and then the pressing block and the bearing disc are coaxially fastened by using bolts;
coaxial annular grooves are formed in the same positions of two end faces of the bidirectional shearing test piece; the diameter of the circular boss is smaller than that of the inner wall of the groove; the diameter of one end of the small aperture of the pressing block is larger than that of the outer wall of the groove.
2. The sheet metal bi-directional shear test device of claim 1, wherein: the pulling and pressing shearing mechanism also comprises a guide rail and an acting support, and the acting support is fixed below the movable support and plays a supporting role; but movable support and effect support bottom all install slide rail or slider with the guide rail cooperation is used for reducing but movable support and movable support atress resistance when removing.
3. The sheet metal bi-directional shear test device of claim 2, wherein: the movable support is of a U-shaped structure, one end side wall of the movable support is fixed with the force sensor, the other end side wall of the movable support is fixed with the circular boss, and the lower end face of the movable support is fixed with the action support.
4. The sheet metal bi-directional shear test device of claim 1, wherein: the speed reducing mechanism comprises a speed reducer, a turbine worm pair, a base and a coupler, and is sequentially connected with the servo motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN111647831A (en) * | 2020-05-21 | 2020-09-11 | 范语楠 | Device and method for preparing Al-Cu-Mg alloy nanocrystalline grain structure |
| CN112170611B (en) * | 2020-08-13 | 2024-12-03 | 无锡诹访拓新精机有限公司 | An electric bidirectional circumcision device |
| CN112611654B (en) * | 2020-11-27 | 2022-05-17 | 山东大学 | Circulating shear fatigue testing machine |
| CN113532370B (en) * | 2021-06-11 | 2023-03-31 | 中国建筑第八工程局有限公司 | Deformation measuring method for bidirectional sheared concrete member |
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