CN106289950B - High-speed stretching centering device and method - Google Patents
High-speed stretching centering device and method Download PDFInfo
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- CN106289950B CN106289950B CN201510278863.XA CN201510278863A CN106289950B CN 106289950 B CN106289950 B CN 106289950B CN 201510278863 A CN201510278863 A CN 201510278863A CN 106289950 B CN106289950 B CN 106289950B
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Abstract
The device comprises a dynamic centering mechanism and a static centering mechanism, wherein the dynamic centering mechanism is arranged in a cavity of a dynamic clamp, a chuck hole is formed in the static centering mechanism, a static chuck is arranged in the chuck hole, a static end of a sample is inserted into the static chuck arranged in the static centering mechanism in advance before high-speed tensile test centering is carried out, and a dynamic end of the sample is inserted into the dynamic centering mechanism in the cavity of the dynamic clamp. Compared with the prior art, the invention has the beneficial effects that: the high-speed stretching centering device and the high-speed stretching centering method can simply and quickly realize synchronous centering of a static end of a high-speed stretching sample before being clamped and a dynamic end which always keeps a free state in a limited space, thereby realizing high-speed stretching centering; quick and accurate centering can be achieved regardless of the variation in sample width.
Description
Technical Field
The invention relates to a high-speed tensile testing technology of a metal plate, in particular to a high-speed tensile centering device and a high-speed tensile centering method.
Background
In the field of dynamic mechanical property research, due to strong promotion by research and development requirements of industries such as automobiles, aerospace and the like, a hydraulic servo type high-speed tensile test gradually becomes a main research and development means.
In the hydraulic servo high-speed tensile test of a sheet metal sample, one sample clamping mode is to clamp the static end of the sample in advance before the test, and the dynamic end of the sample is kept in a freely suspended state in a limited space surrounded by a striker, a dynamic clamp cavity and the like. In the test process, after the speed of the dynamic clamp reaches a preset value, the dynamic end of the sample is clamped, and further the subsequent tensile test is completed.
Such high-speed tensile samples are generally much longer than static tensile samples, and if only the static ends are centered, it is difficult to ensure synchronous centering of the dynamic ends due to the dead weight of the sample, and thus it is difficult to achieve high-precision high-speed tensile centering. And at higher test speeds, to ensure that the dynamic clamp obtains a greater acceleration stroke, the dynamic clamp needs to be lowered a greater distance along the sample during sample installation to allow the dynamic end to be inserted into the cavity of the dynamic clamp. Because the cavity is narrow, if the centering accuracy is not high, the dynamic end is very easy to touch the dynamic clamp and the cavity of the dynamic clamp to damage and bend when the dynamic clamp descends, and finally the test is failed, even equipment is damaged.
The existing static stretching centering device for the plate cannot reach the dynamic end of a high-speed stretching sample due to the blocking of a ram, a dynamic clamp and the like. At present, a centering scheme specially aiming at the dynamic end of the high-speed tensile sample in a limited space is not available, so that a rough centering mode of visual inspection and hand touch can only be adopted before the test is carried out, the consistency of a test result is difficult to ensure, and the centering scheme is not suitable for the high-precision requirement of dynamic test.
Disclosure of Invention
The invention aims to provide a high-speed stretching centering device and a high-speed stretching centering method, which can accurately center a static end of a sample before a test and synchronously center a dynamic end of the sample in a free state in a limited space, thereby realizing high-precision high-speed stretching centering.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the high-speed tensile centering device comprises a dynamic centering mechanism and a static centering mechanism, wherein the dynamic centering mechanism is arranged in a cavity of a dynamic clamp, a chuck hole is formed in the static centering mechanism, a static chuck is arranged in the chuck hole, before high-speed tensile test centering is carried out, the static end of a sample is inserted into the static chuck arranged in the static centering mechanism in advance, and the dynamic end of the sample is inserted into the dynamic centering mechanism in the cavity of the dynamic clamp.
The dynamic centering mechanism comprises a centering cone, positioning plates, clamping plates, supporting rods and a tray, when high-speed stretching dynamic centering is carried out, the centering cone is clamped on two sides of the section of the dynamic end of a sample, the positioning plates are horizontally arranged below the centering cone, the supporting rods penetrate upwards from the lower ends of the positioning plates, the lower ends of the supporting rods are fixedly connected with the tray, the upper ends of the supporting rods are temporarily fixed with the outer side of the dynamic clamp, and at least one clamping plate is padded between the positioning plates and the tray.
The locating piece is wholly U-shaped structure, be provided with a 1/2 round hole and a 1/4 round hole respectively at the inboard bottom of locating piece and edge, the diameter of two round holes is the same with the diameter of two striker rods, the centre-to-centre distance of two round holes is the same with the centre-to-centre distance of two striker rods, during operation, two striker rods card are in two round holes, be fixed with the rectangular plate along the both sides of U-shaped structure at the upper surface of locating piece, two rectangular plates are on a parallel with the central line of two round holes, and use the central line of two round holes to set up as axisymmetry, the length of rectangular plate is the same with the width of sample.
The static centering mechanism comprises a driving mechanism, a driven mechanism, a detection mechanism, an insulated wire and an operation table, wherein two sets of driven mechanisms are symmetrically arranged at two ends of a chuck hole on the operation table, the symmetrical surfaces of the two sets of driven mechanisms are the middle vertical surfaces of a static chuck working surface, sleeve rods on the two sets of driven mechanisms are coaxially arranged, the driving mechanism is arranged on the operation table, the symmetrical surfaces of the driving mechanism are coincident with the symmetrical surfaces of the two sets of driven mechanisms, one end of the insulated wire is fixedly connected with the sleeve rods of the driven mechanisms, the other end of the insulated wire penetrates through a cylinder on the driving mechanism and is fixedly connected with a frame, the connecting point of the insulated wire and the frame is on the symmetrical surface of the driving mechanism, and the two insulated wires for connecting the driven mechanisms and the driving mechanism are equal in length.
The driving mechanism comprises cylinders, a sliding block, a screw rod support, a rotating hand wheel and a frame, wherein the sliding block is placed on the operation table, the upper end of the sliding block takes the longitudinal central line of the sliding block as a symmetrical axis, two cylinders are symmetrically welded, threaded holes are formed in the sliding block, the frame is fixedly connected with the operation table, the screw rod sequentially penetrates through an inner hole of the frame and the threaded holes of the sliding block, the screw rod support is erected on one side, close to the operation end, of the screw rod, the screw rod support is fixed on the operation table, and the rotating hand wheel is installed at the operation end of the screw rod.
The driven mechanism comprises a sleeve, a loop bar, an insulating pad, a wiring terminal and a fixing ring, wherein the insulating pad is fixed on the operating platform, the sleeve is fixed at the upper end of the insulating pad, the loop bar is arranged in the sleeve, the sleeve is in clearance fit with the loop bar, the fixing ring is fixed at one end, close to the static chuck, of the loop bar, the fixing ring is connected with an insulating wire, and the wiring terminal is fixed on the loop bar.
The method for centering the high-speed tensile test sample by adopting the high-speed tensile centering device comprises the following method steps:
1) Inserting the static end of the sample into a static chuck in a chuck hole of the static centering mechanism;
2) Gradually reducing the gap between the static chuck and the sample but ensuring that the gap is not equal to zero;
3) The loop bar in the driven mechanism is close to the sample, and the loop bar and the sample are contacted with each other;
4) Inserting the dynamic end of the sample into the cavity of the dynamic clamp;
5) Inserting a centering cone into two sides of a section of a sample in a cavity of the dynamic clamp; inserting a positioning sheet, clamping the striker rod in two round holes on the positioning sheet, and clamping the rectangular sheet into a gap between two centering cones;
6) Fixing a support rod of a pre-connected tray with a dynamic clamp;
7) Inserting a clamping piece until the centering cone is completely fixed in the cavity of the dynamic clamp;
8) Fixing the static end of the sample;
9) And (5) taking down the centering device to finish high-speed stretching centering.
Compared with the prior art, the invention has the beneficial effects that:
the high-speed stretching centering device and the high-speed stretching centering method can simply and quickly realize synchronous centering of a static end of a high-speed stretching sample before being clamped and a dynamic end which always keeps a free state in a limited space, thereby realizing high-speed stretching centering; quick and accurate centering can be achieved regardless of the variation in sample width.
Drawings
FIG. 1 is a schematic view of a high-speed tension centering device according to the present invention;
in the figure: 1. a sample; 2. a dynamic end; 3. a dynamic centering mechanism; 4. a static end; 5. a static centering mechanism; 6. a dynamic clamp; 7. centering cone; 8. a positioning sheet; 9. a clamping piece; 10. a striker; 11. a support rod; 12. a tray; 13. rectangular pieces; 14. a static chuck; 15. an active mechanism; 16. an insulating wire; 17. a driven mechanism; 18. a detection mechanism; 19. a cylinder; 20. an operation table; 21. a slide block; 22. a screw rod; 23. a screw rod bracket; 24. rotating a hand wheel; 25. a sleeve; 26. a loop bar; 27. an insulating pad; 28. a connection terminal; 29. a fixing ring; 30. a frame; 31. a multimeter; 32. copper wire.
Detailed Description
The present invention will be described in detail below with reference to the drawings of the specification, but it should be noted that the practice of the present invention is not limited to the following embodiments.
As shown in fig. 1, the high-speed tensile centering device comprises a dynamic centering mechanism 3 and a static centering mechanism 5, wherein the dynamic centering mechanism 3 is arranged in a cavity of a dynamic clamp 6, a chuck hole is arranged on the static centering mechanism 5, a static chuck 14 is arranged in the chuck hole, a static end 4 of a sample 1 is inserted into the static chuck 14 arranged in the static centering mechanism 5 in advance before high-speed tensile test centering is carried out, and a dynamic end 2 of the sample 1 is inserted into the dynamic centering mechanism 3 in the cavity of the dynamic clamp 6.
The dynamic centering mechanism 3 comprises a centering cone 7, a positioning sheet 8, a clamping sheet 9, a supporting rod 11 and a tray 12, wherein the centering cone 7 is clamped on two sides of the section of the dynamic end 2 of the sample 1 when the sample 1 is dynamically centered in a high-speed stretching mode, the positioning sheet 8 is horizontally arranged below the centering cone 7, the lower end of the centering cone 7 is clamped between a rectangular sheet 13 and a collision rod 10 at the upper end of the positioning sheet 8, the supporting rod 11 passes through the lower end of the positioning sheet 8 upwards, the lower end of the supporting rod 11 is fixedly connected with the tray 12, the upper end of the supporting rod 11 is temporarily fixed on the outer side of a cavity of the dynamic clamp 6, and at least one clamping sheet 9 is padded between the positioning sheet 8 and the tray 12.
The surface of the centering cone 7 is in a polyhedral structure, and is smooth, the surface of the centering cone comprises a conical surface and a plane, the conical surface faces the inner side of the cavity of the dynamic clamp 6, the plane comprises a centering cone 7 side plane which is positioned on the side of the section of the sample 1 and is parallel to the section of the sample 1, and the bottom surface of the centering cone 7 is perpendicular to the section of the sample 1;
the support rod 11 has a cylindrical structure. The tray 12 has a semicircular ring structure.
The thickness of the locating piece 8 is 3mm, the locating piece 8 is of a U-shaped structure integrally, a 1/2 round hole and a 1/4 round hole are respectively formed in the bottom and the edge of the inner side of the locating piece 8, the diameters of the two round holes are identical to those of the two striker bars 10, the center distance of the two round holes is identical to that of the two striker bars 10, the two striker bars 10 are 90mm, when the locating piece is in operation, rectangular pieces 13 are fixed on the upper surface of the locating piece 8 along the two sides of the U-shaped structure, the two rectangular pieces 13 are parallel to the center lines of the two round holes, the center lines of the two round holes are used as axisymmetric, the length of the rectangular pieces 13 is identical to the width of the sample 1, the width of the rectangular pieces 13 is 5mm, and the thickness is 2mm.
The shape of the clamping piece 9 is the same as that of the positioning piece 8 with the rectangular piece 13 removed, and the thickness of the clamping piece 9 is 0.01mm,0.02mm and 0.03 mm. . . Up to 1mm, 50 sheets of each gauge gripping sheet 9 were present.
The static centering mechanism 5 comprises a driving mechanism 15, a driven mechanism 17, a detection mechanism 18, an insulation wire 16 and an operation table 20, wherein two sets of driven mechanisms 17 are symmetrically arranged at two ends of a chuck hole on the operation table 20, symmetrical planes of the two sets of driven mechanisms 17 are middle vertical planes of a working surface of the static chuck 14, sleeve rods 26 on the two sets of driven mechanisms 17 are coaxially arranged, the driving mechanism 15 is arranged on the operation table 20, the symmetrical planes of the driving mechanism 15 are overlapped with the symmetrical planes of the two sets of driven mechanisms 17, one end of the insulation wire 16 is fixedly connected with the sleeve rods 26 of the driven mechanisms 17, the other end of the insulation wire 16 passes through a cylinder 19 on the driving mechanism 15 and is fixedly connected with a frame 30, a connecting point of the insulation wire 16 and the frame 30 is arranged on the symmetrical planes of the driving mechanism 15, the two insulation wires 16 connecting the driven mechanisms 17 and the driving mechanism 15 are equal in length, and the detection mechanism 18 is respectively connected with the sleeve rods 26 of the two driven mechanisms 17 through copper wires 32.
The insulated wire 16 is an inelastic soft insulated wire having a diameter of 3 mm.
The driving mechanism 15 comprises cylinders 19, a sliding block 21, a lead screw 22, a lead screw support 23, a rotary hand wheel 24 and a frame 30, wherein the sliding block 21 is arranged on the operation table 20, the upper end of the sliding block 21 is symmetrically welded with the longitudinal center line of the sliding block as a symmetrical axis, threaded holes are formed in the sliding block 21, the frame 30 is fixedly connected with the operation table 20, the lead screw 22 sequentially penetrates through the inner hole of the frame 30 and the threaded holes of the sliding block 21, the lead screw support 23 is erected on one side, close to the operation end, of the lead screw 22, the lead screw support 23 is fixed on the operation table 20, and the rotary hand wheel 24 is arranged at the operation end of the lead screw 22.
The cylinder 19 is a steel pipe having a diameter of 4 mm.
The axis of the cylinder 19 at the upper end of the sliding block 21 of the driving mechanism 15 is on the same horizontal plane with the axis of the loop bar 26 of the driven mechanism 17.
The driving mechanism 15 is of a symmetrical structure as a whole, and the longitudinal center line of the slide block 21, the symmetry axis of the cylinder 19 and the center line of the screw 22 all fall on the symmetry plane of the driving mechanism 15.
The driven mechanism 17 comprises a sleeve 25, a sleeve rod 26, an insulating pad 27, a wiring terminal 28 and a fixing ring 29, wherein the insulating pad 27 is fixed on the operating platform 20, the sleeve 25 is fixed at the upper end of the insulating pad 27, the sleeve rod 26 is arranged in the sleeve 25, the sleeve 25 is in clearance fit with the sleeve rod 26, the fixing ring 29 is fixed at one end of the sleeve rod 26 close to the static clamping head 14, the fixing ring 29 is connected with the insulating wire 16, and the wiring terminal 28 is fixed at the outer end part of the sleeve rod 26.
The fixing rings 29 are welded on the side of the loop bars 26 facing the driving mechanism 15, and the positions of the welding fixing rings 29 on the two loop bars 26 are the same.
The detection mechanism 18 comprises a universal meter 31 and a copper wire 32, and the anode and the cathode of the universal meter 31 are respectively connected with the copper wire 32. The other end of the copper wire 32 is connected to the terminal block 28 on the loop bar 26.
In the embodiment, the thickness of the high-speed stretching sheet metal sample 1 is 2mm, the width of the clamping part is 25mm, the length of the dynamic end 2 is 300mm, and the length of the static end 4 is 100mm. The method for carrying out high-speed stretching centering on the sample 1 by adopting the high-speed stretching centering device comprises the following method steps:
1) When the dynamic clamp 6 is moved up to nearly approach the upper end of the plunger 10, the static end 4 of the sample 1 is inserted in the vertical direction between two static chucks 14 that are loosened 5mm in advance;
2) If the sample 1 cannot be placed between the two static chucks 14 safely and nondestructively after the operation in the step 1), the beam where the dynamic clamp 6 is positioned is moved upwards, so that the sample 1 can be just inserted between the two static chucks 14;
3) Tightening the fastening bolt of the static clamping head 14, so that the clearance between the working surface of the static clamping head 14 and the sample 1 is less than 1mm but is ensured to be different from zero;
4) Checking a wire connection line, ensuring that the copper wire 32 is connected with each mechanism correctly, opening the universal meter 31, and dialing to a resistance gear;
5) Pulling the rotating hand wheel 24 (when the screw thread of the screw 22 is a right-handed screw, the rotating hand wheel 24 is pulled anticlockwise, and when the screw thread of the screw 22 is a left-handed screw, the rotating hand wheel 24 is pulled clockwise), so that the sliding block 21 drives the cylinder 19 to move towards the direction of the sample 1, and at the moment, the insulating wire 16 drives the two loop bars 26 to move towards the direction of the sample 1 under the action of the cylinder 19;
when one of the loop bars 26 contacts the sample 1, the sample 1 is pushed in the other direction, and the two loop bars 26 are symmetrically arranged by taking the center vertical plane of the working surface of the chuck 14 as the symmetrical plane, so that when the two loop bars 26 fully contact the sample 1, the static end 4 of the sample 1 is automatically centered.
6) When the loop bar 26 fully contacts the sample 1, immediately checking the reading of the universal meter 31 until the resistance is zero, and loosening the rotary hand wheel 24;
7) Slowly moving down the dynamic clamp 6 while guiding the sample 1 to penetrate into the cavity of the dynamic clamp 6 without contacting any part of the dynamic clamp 6;
8) If the dynamic clamp 6 moves down to the lower limit, and the sample 1 still does not enter the cavity of the dynamic clamp 6, the beam moves down to enable the dynamic clamp 6 to move down and continuously guide the dynamic end 2 of the sample 1 to a position, which is approximately 10mm away from the upper end face of the cavity, of the top of the dynamic end 2;
9) Inserting two centering cones 7 of the dynamic centering mechanism 3 into a gap between the plunger 10 and the sample 1 at an opening on the side surface of the cavity of the dynamic clamp 6, so that the tops of the two centering cones 7 face upwards and the side plane faces the section of the sample 1; the positioning sheet 8 is horizontally inserted into the striker 10 and the sample 1, 1/2 circle and 1/4 circle on the positioning sheet 8 are respectively clamped on the front striker 10 and the rear striker 10, the positioning sheet 8 and the centering cone 7 are moved up and down along the striker 10, the directions of two rectangular sheets 13 on the positioning sheet 8 are adjusted, and the two rectangular sheets 13 are just clamped into gaps formed by the side planes of the two centering cones 7 along the length direction;
at this time, the dynamic end 2 of the sample 1 is initially centered with reference to the center distance of the striker 10.
10 The lower ends of the two support rods 11 are respectively connected with the two trays 12 in advance, then the two support rods 11 vertically pass through the middle part of the positioning sheet 8 along the collision rod 10 in tandem, and the upper ends of the support rods 11 are fixedly connected with the outer side of the cavity of the dynamic clamp 6;
the supporting rod 11 is provided with a threaded hole, and the corresponding position on the outer side of the cavity of the dynamic clamp 6 is also provided with a threaded hole, and the supporting rod 11 is fixedly connected with the dynamic clamp 6 through bolts.
11 10 clamping sheets 9 with the thickness of 1mm, 8 clamping sheets 9 with the thickness of 0.05mm, 5 clamping sheets 9 with the thickness of 0.02mm and 2 clamping sheets 9 with the thickness of 0.02mm are sequentially and horizontally inserted between the positioning sheet 8 and the tray 12, so that the positioning sheet 8 and the centering cone 7 move upwards until the centering cone 7 is completely clamped on the upper end surface of the cavity of the dynamic clamp 6;
the dynamic end 2 of the sample 1 is now finally centered and positioned.
12 The rotary hand wheel 24 is pulled clockwise again to make the resistance of the universal meter 31 zero, and simultaneously the static chuck 14 is immediately and completely screwed down to completely fix the static end 4 of the sample 1;
13 All parts of the dynamic centering mechanism 3 are sequentially removed, and high-speed stretching centering of the sample 1 is completed.
Claims (5)
1. The high-speed stretching centering device is characterized by comprising a dynamic centering mechanism and a static centering mechanism, wherein the dynamic centering mechanism is arranged in a cavity of a dynamic clamp, a chuck hole is formed in the static centering mechanism, a static chuck is arranged in the chuck hole, a static end of a sample is inserted into the static chuck arranged in the static centering mechanism in advance before high-speed stretching test centering is carried out, and a dynamic end of the sample is inserted into the dynamic centering mechanism in the cavity of the dynamic clamp;
the dynamic centering mechanism comprises a centering cone, positioning plates, clamping plates, supporting rods and a tray, wherein when high-speed stretching dynamic centering is carried out, the centering cone is clamped on two sides of the section of a dynamic end of a sample, the positioning plates are horizontally arranged below the centering cone, the supporting rods penetrate upwards from the lower ends of the positioning plates, the lower ends of the supporting rods are fixedly connected with the tray, the upper ends of the supporting rods are temporarily fixed with the outer side of the dynamic clamp, and at least one clamping plate is padded between the positioning plates and the tray;
the static centering mechanism comprises a driving mechanism, a driven mechanism, a detection mechanism, an insulated wire and an operation table, wherein two sets of driven mechanisms are symmetrically arranged at two ends of a chuck hole on the operation table, the symmetrical surfaces of the two sets of driven mechanisms are the middle vertical surfaces of a static chuck working surface, sleeve rods on the two sets of driven mechanisms are coaxially arranged, the driving mechanism is arranged on the operation table, the symmetrical surfaces of the driving mechanism are coincident with the symmetrical surfaces of the two sets of driven mechanisms, one end of the insulated wire is fixedly connected with the sleeve rods of the driven mechanisms, the other end of the insulated wire penetrates through a cylinder on the driving mechanism and is fixedly connected with a frame, the connecting point of the insulated wire and the frame is on the symmetrical surface of the driving mechanism, and the two insulated wires for connecting the driven mechanisms and the driving mechanism are equal in length.
2. A high-speed tension centering device as claimed in claim 1, wherein: the locating piece is wholly U-shaped structure, be provided with a 1/2 round hole and a 1/4 round hole respectively at the inboard bottom of locating piece and edge, the diameter of two round holes is the same with the diameter of two striker rods, the centre-to-centre distance of two round holes is the same with the centre-to-centre distance of two striker rods, during operation, two striker rods card are in two round holes, be fixed with the rectangular plate along the both sides of U-shaped structure at the upper surface of locating piece, two rectangular plates are on a parallel with the central line of two round holes, and use the central line of two round holes to set up as axisymmetry, the length of rectangular plate is the same with the width of sample.
3. A high-speed tension centering device as claimed in claim 1, wherein: the driving mechanism comprises cylinders, a sliding block, a screw rod support, a rotating hand wheel and a frame, wherein the sliding block is placed on the operation table, the upper end of the sliding block takes the longitudinal central line of the sliding block as a symmetrical axis, two cylinders are symmetrically welded, threaded holes are formed in the sliding block, the frame is fixedly connected with the operation table, the screw rod sequentially penetrates through an inner hole of the frame and the threaded holes of the sliding block, the screw rod support is erected on one side, close to the operation end, of the screw rod, the screw rod support is fixed on the operation table, and the rotating hand wheel is installed at the operation end of the screw rod.
4. A high-speed tension centering device as claimed in claim 1, wherein: the driven mechanism comprises a sleeve, a loop bar, an insulating pad, a wiring terminal and a fixing ring, wherein the insulating pad is fixed on the operating platform, the sleeve is fixed at the upper end of the insulating pad, the loop bar is arranged in the sleeve, the sleeve is in clearance fit with the loop bar, the fixing ring is fixed at one end, close to the static chuck, of the loop bar, the fixing ring is connected with an insulating wire, and the wiring terminal is fixed on the loop bar.
5. A method of centering a high-speed tensile test specimen using a high-speed tensile centering device as defined in claim 2, comprising the method steps of:
1) Inserting the static end of the sample into a static chuck in a chuck hole of the static centering mechanism;
2) Gradually reducing the gap between the static chuck and the sample but ensuring that the gap is not equal to zero;
3) The loop bar in the driven mechanism is close to the sample, and the loop bar and the sample are contacted with each other;
4) Inserting the dynamic end of the sample into the cavity of the dynamic clamp;
5) Inserting a centering cone into two sides of a section of a sample in a cavity of the dynamic clamp; inserting a positioning sheet, clamping the striker rod in two round holes on the positioning sheet, and clamping the rectangular sheet into a gap between two centering cones;
6) Fixing a support rod of a pre-connected tray with a dynamic clamp;
7) Inserting a clamping piece until the centering cone is completely fixed in the cavity of the dynamic clamp;
8) Fixing the static end of the sample;
9) And (5) taking down the centering device to finish high-speed stretching centering.
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| CN201510278863.XA CN106289950B (en) | 2015-05-27 | 2015-05-27 | High-speed stretching centering device and method |
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| CN103712851A (en) * | 2013-12-20 | 2014-04-09 | 浙江大学 | High-pressure hydrogen environment fatigue test clamp for material testing machine |
| CN204177664U (en) * | 2014-03-28 | 2015-02-25 | 云南电力试验研究院（集团）有限公司电力研究院 | A kind of aligning device for sheet coupon tension test |
| CN204694541U (en) * | 2015-05-27 | 2015-10-07 | 鞍钢股份有限公司 | A kind of high-speed stretch centralising device |
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