CN103743639A - Method for detecting bending fatigue property of welding connector and bending machine - Google Patents
Method for detecting bending fatigue property of welding connector and bending machine Download PDFInfo
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- CN103743639A CN103743639A CN201310731018.4A CN201310731018A CN103743639A CN 103743639 A CN103743639 A CN 103743639A CN 201310731018 A CN201310731018 A CN 201310731018A CN 103743639 A CN103743639 A CN 103743639A
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Abstract
The invention relates to a method for detecting a bending fatigue property of a welding joint and a bending machine. The method comprises the following steps of (1) surveying the diameter D of a reversing roller and the length a of a trim welding joint sheared off by a pair of average trim shears, sampling 50 samples of the trim welding joints, recording the length of each of the trim welding joints as ai, and calculating the length a of the average trim welding joint as: a=(a1+a2+...+a50)/50; (2) unifying the unit of the diameter D of the reversing roller and the length a of the trim welding joint, and calculating alpha: alpha=arctg(a/D); assuming that a bending angle is deviated for alpha from the normal; (3) surveying the times n of reversing strip steel in production, and assuming that the strip steel is qualified if the strip steel is not fractured after being bent for n+1 times; (4) arranging each trim welding joint onto a sample clamp, moving the position of a crankshaft on a turntable, and adjusting the bending angle to be alpha; (5) rotating a rocker arm, and bending each trim welding joint, wherein if each trim welding joint is not fractured after being bent for (n+1) times, the welding joint is qualified, and if the trim welding joint is fractured in the bending process, the welding joint is unqualified.
Description
Technical field
The present invention relates to iron and steel manufacturing, particularly a kind of method and bender that detects welding joint bending fatigue performance.
Background technology
In carrying out the process of iron and steel roll bending production, after continuous need of production will move ahead and roll up, follow-up volume couples together, current method of attachment is welding, welding is a kind of high temperature Thermal Cycling, changed the tissue of steel plate itself, make the performance of itself and steel plate itself have very large difference, the welding between especially different thickness specifications, different steel grades makes welding joint become the part with most fragile in steel production run more.The large production product line of steel mill moves continuously in order to guarantee main unit in addition, generally the long kink of hundreds of rice is all set, and kink plays the effect of impact damper, causes shutdown phenomenon when unit rhythm is asynchronous before and after preventing.Due to place restriction, which floor kink generally divides, and steel plate need to be at reversing roller reciprocating reversing repeatedly.The existence of kink makes to be with between steel and steel band weld seam will stand repeatedly back and forth bending, and production scene does not have special bending tool and material and weld seam carried out to the evaluation of buckling performance at present.Whether general welder's micro-judgment weld seam that leans on meets the requirements.
But under some working condition, need Welded Joints buckling performance to carry out scientific evaluation.For example line production new varieties are produced in pickling at present, are all generally to carry out just producing continuously after simple bending experiment, and the hidden danger that this method exists is that a bending can not reflect bending fatigue behaviour, can not fully estimate production risk.While producing continuously for another example, can there is different welding qualities because of fluctuation or the welder performance fluctuation of coil of strip in weld seam, only depend on range estimation can not judge whether welding joint meets the demands, and especially weldability is poor, the steel grade that production difficulty is large.In above two kinds of situations, having a big risk of phenomenon of rupture may be there is, thereby the evaluation of science need to be compared.
Chinese patent CN201120314013.8 discloses manual bending machine, comprises support, lifting jack and two positioning vertical columns, uses column as by the stress point of bending material and limit bending angle, for material being converted into crooked required shape.Chinese patent CN201120249929.X discloses a kind of manual tube bending machine, frame is provided with the medial support wheel of rotation, the end face of frame is provided with the guide rail of arranging along medial support wheel radial, is sliding combined with Mobile base on guide rail, and Mobile base is provided with two outside squeegee rollers.Can two outside squeegee rollers be moved with Mobile base by manual adjustment, complete more complicated bending.
Summary of the invention
The object of this invention is to provide a kind of method and bender that detects welding joint bending fatigue performance, evaluation welding joint bending fatigue behaviour that can simple and fast.
For achieving the above object, technical scheme of the present invention is:
A reciprocal bender, it comprises, base; Fixed support, is vertically arranged at base upper surface one side, and set collar is established in its upper end; Coupling shaft, is arranged in above-mentioned support bracket fastened set collar; Rocking arm, its one end connects one end of coupling shaft; Rotating disk, center of turntable connects the other end of coupling shaft; Chute support, is vertically arranged at middle part, base upper surface, the opposite side of the relative rocking arm of rotating disk; A chute is established on chute support top, and chute vertically arranges; Toggle, comprises, crank, and one end is connected in described rotating disk card one side by spindle, and crank is parallel with rotating disk card; Connecting rod, is arranged in the chute of chute support, and its one end is flexibly connected with the crank other end; Driven by rotary disc crank connecting link is done movement in vertical direction with crank-motion; Bending mechanism, comprises, bending arm, is frame structure, and one middle side part is established breach; Upper and lower pressure head, is arranged at respectively the upper and lower side of bending arm one side breach; Fixture, is arranged at the upper and lower pressure head of bending mechanism below, comprises, two fixture mount, are oppositely arranged; Two clamping plate, are arranged at respectively two fixture mount upper ends.
Further, the corresponding spindle of described rotating disk is established the locating slot plugging for spindle.
On described rotating disk, corresponding locating slot is established the scale mark of corresponding bending angle.
Again, described clamping plate comprise that upper and lower plate is established support spring between upper and lower plate; Adjusting bolt, its lower end is through upper plate against lower plate, and adjusting handle is established on adjusting bolt top.
Have, described two clamping plate and fixture mount are pivotally connected again.Described clamping plate can rotate around its axle, for coordinating bending angle to change.
Described upper and lower pressure head is threaded with bending arm, can twist to regulate fixedly welding joint.
In addition, the described relative one side of upper and lower pressure head is equipped with a groove that is used for fixing welder joint projection weld seam.
The described relative one side of upper and lower pressure head is arc transition.
A kind of method that detects welding joint bending fatigue performance of the present invention, it comprises the steps:
1) the trimming welding joint length a that the diameter dimension D of investigation reversing roller and average trimming shears cutter are cut, the sampling of trimming welding joint this 50, each length is designated as a
i, calculate average trimming welding joint length a=(a1+a2+ ... + a50)/50;
2) by reversing roller diameter D and trimming welding joint length a uniform units, calculate α=arctg(a/D); Set bending angle and depart from α along normal direction;
3) frequency n that need to commutate when investigation is produced with steel, sets bending times and does not ftracture for n+1 time as qualified;
4) trimming welding joint is put on described specimen holder, rotates degree of tightness part and fix, the position of removable crank spindle on rotating disk, adjusting bending angle is α;
5) rotate described rocking arm, the limit welding joint that liquidates carries out bending; If bending times reaches not cracking n+1 time, illustrate that welding joint is qualified, if trimming welding joint ftractures in Forging Process, illustrate that welding joint is defective.
The present invention can carry out the reciprocal bending of hand, tack weld exactly, and the band steel welded joint bending state of can simulated field producing, thus Welded Joints buckling performance is evaluated more accurately rapidly.Not only save energy consumption, guarantee safety in production, and manually bending is more flexible, makes operator can judge at any time the state of welding joint.In addition, this manual bending machine can, for evaluating the large production welding performance of new steel grade, help debugging to optimize welding technology.
Beneficial effect of the present invention
The present invention is Promethean to have developed produce bender and the bending method of welding joint bending fatigue behaviour with steel, Welded Joints carries out the evaluation of bending fatigue behaviour efficiently and effectively, do not affect rhythm of production, greatly reduce with steel production scene welding joint through risks that repeatedly commutation moves such as kinks.Bender itself is simple in structure easy to operate, and energy-conserving and environment-protective.
The present invention has filled up the blank to the test aspect with steel welded joint bending fatigue behaviour at present.
Accompanying drawing explanation
Fig. 1 is the structural representation of bender embodiment of the present invention;
Fig. 2 is the structural representation of specimen holder in bender embodiment of the present invention;
Fig. 3 is the schematic diagram of bender embodiment turntable of the present invention;
Fig. 4 is the schematic diagram of upper push-down head in bender embodiment of the present invention;
Fig. 5 is the band steel commutation schematic diagram in of the present invention;
Fig. 6 is band steel edge-punching welding joint schematic diagram of the present invention;
Fig. 7 is the A portion enlarged diagram of Fig. 6.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the present invention is described in further detail.
Referring to Fig. 1～Fig. 4, a kind of reciprocal bender of the present invention, it comprises, base 1; Fixed support 2, is vertically arranged at base 1 upper surface one side, and set collar 21 is established in its upper end; Coupling shaft 3, is arranged in the set collar 21 of above-mentioned fixed support 2; Rocker arm 4, its one end connects one end of coupling shaft 3; Rotating disk 5, center of turntable connects the other end of coupling shaft 3; Chute support 6, is vertically arranged at base 1 middle part, upper surface, the opposite side of the relative Rocker arm 4 of rotating disk; A chute 61 is established on chute support 6 tops, and chute 61 vertically arranges; Toggle 7, comprises, crank 71, and one end is connected in described rotating disk 5 card one sides by spindle 72, and crank 71 is parallel with rotating disk 5 cards; Connecting rod 73, is arranged in chute support 6 chutes 6, and its one end is flexibly connected with crank 71 other ends; Rotating disk 5 drives crank 71, connecting rod 73 to do movement in vertical direction with crank 71 motions; Bending mechanism 8, comprises, bending arm 81, is frame structure, and one middle side part is established breach 811; Upper and lower pressure head 82,83, is arranged at respectively the upper and lower side of bending arm 81 1 side breach 811; Fixture 9, is arranged at the upper and lower pressure head of bending mechanism 8 82,83 belows, comprises, two fixture mount 91,91 ', are oppositely arranged; Two clamping plate 92,92 ', are arranged at respectively two fixture mount 91,91 ' upper ends.
The corresponding spindle 72 of described rotating disk 5 is established the locating slot 51 plugging for spindle 72.
On described rotating disk 5, corresponding locating slot 51 is established the scale mark 52 of corresponding bending angle.
Described clamping plate 92(be take clamping plate 92 as example, lower same) comprise that upper and lower plate 921,922 is established support spring 923 between upper and lower plate 921,922; Adjusting bolt 924, its lower end is through upper plate 921 against lower plate 922, and adjusting handle 925 is established on adjusting bolt 924 tops.
Two described clamping plate 92 are pivotally connected by rotating shaft 93 with fixture mount 91.Left and right two auxiliary splints of described fixture can rotate around its axle, for coordinating bending angle to change.
Described upper and lower pressure head 82,83 all has screw thread, can twist to regulate fixedly welding joint.
Described upper and lower pressure head 82,83 relative one sides are equipped with a groove 821,831 that is used for fixing welder joint projection weld seam.
Described upper and lower pressure head 82,83 relative one sides are arc transition.
Use clamp clamps weld joint samples 100, weld joint samples is put into clamping plate, weld seam is placed placed in the middle, adjusting bolt, and welding joint is fixed.Upper and lower pressure head on twisting bending arm is by welding joint to just blocking weld seam, and pressure head groove part blocks protruding weld seam.Along the axle of chute removable crank, to the scale shown in scale mark, fixing according to the angular movement providing; Then shake rocking arm and rotating disk, driven by rotary disc crank reciprocally swinging, crank drives bending arm, and the upper and lower pressure head on bending arm withstands welding joint bends it.
The invention also discloses a kind of method that detects welding joint bending fatigue performance, according to actual production line data, formulate concrete bending scheme, and use described hand reciprocating bender to carry out the evaluation of bending fatigue behaviour, whether check welding joint meets need of production.
Referring to Fig. 5～Fig. 7, a kind of method that detects welding joint bending fatigue performance of the present invention, comprises the steps:
1) in the band large production scene of steel, reversing roller 200 place's band steel 300 have bending, referring to Fig. 5, in order to guarantee production safety, be with to have trimming shears after steel toe tail welding and cut part welding joint at every turn, the welding joint of cutting is called to trimming welding joint, referring to Fig. 6, first investigate the diameter dimension D of reversing roller 200 and the trimming welding joint length a that average trimming shears cutter is cut, trimming welding joint sampling basis 50, each length is designated as a
i, calculate average trimming welding joint length a=(a1+a2+ ... + a50)/50;
2) by reversing roller diameter D and trimming welding joint length a uniform units, calculate α=arctg(a/D); Set bending angle and depart from α along normal direction; Referring to Fig. 7;
3) frequency n that need to commutate when investigation is produced with steel, sets bending times and does not ftracture for n+1 time as qualified;
4) trimming welding joint is put on described specimen holder, rotating bolt is fixed, the position of removable crank spindle on rotating disk, and regulating bending angle size is α;
5) rotate described rocking arm, the limit welding joint that liquidates carries out bending; If bending times reaches not cracking n+1 time, illustrate that welding joint is qualified, if trimming welding joint ftractures in Forging Process, illustrate that welding joint is defective.
Claims (9)
1. a reciprocal bender, is characterized in that: comprises,
Base;
Fixed support, is vertically arranged at base upper surface one side, and set collar is established in its upper end;
Coupling shaft, is arranged in above-mentioned support bracket fastened set collar;
Rocking arm, its one end connects one end of coupling shaft;
Rotating disk, center of turntable connects the other end of coupling shaft;
Chute support, is vertically arranged at middle part, base upper surface, the opposite side of the relative rocking arm of rotating disk; A chute is established on chute support top, and chute vertically arranges;
Toggle, comprises,
Crank, one end is connected in described rotating disk card one side by spindle, and crank is parallel with rotating disk card;
Connecting rod, is arranged in the chute of chute support, and its one end is flexibly connected with the crank other end; Driven by rotary disc crank connecting link is done movement in vertical direction with crank-motion;
Bending mechanism, comprises,
Bending arm, is frame structure, and one middle side part is established breach;
Upper and lower pressure head, is arranged at respectively the upper and lower side of bending arm one side breach;
Fixture, is arranged at the upper and lower pressure head of bending mechanism below, comprises,
Two fixture mount, are oppositely arranged;
Two clamping plate, are arranged at respectively two fixture mount upper ends.
2. reciprocal bender as claimed in claim 1, is characterized in that: the corresponding spindle of described rotating disk is established the locating slot plugging for spindle.
3. reciprocal bender as claimed in claim 1, is characterized in that: on described rotating disk, corresponding locating slot is established the scale mark of corresponding bending angle.
4. reciprocal bender as claimed in claim 1, is characterized in that: described clamping plate comprise upper and lower plate, between upper and lower plate, establishes support spring; Adjusting bolt, its lower end is through upper plate against lower plate, and adjusting handle is established on adjusting bolt top.
5. reciprocal bender as claimed in claim 1, is characterized in that: described two clamping plate and fixture mount are pivotally connected.
6. reciprocal bender as claimed in claim 1, is characterized in that: described upper and lower pressure head is threaded with bending arm.
7. reciprocal bender as claimed in claim 1, is characterized in that: the described relative one side of upper and lower pressure head is equipped with a groove that is used for fixing welder joint projection weld seam.
8. the reciprocal bender as described in claim 1 or 7, is characterized in that: the described relative one side of upper and lower pressure head is arc transition.
9. a method that detects welding joint bending fatigue performance, it comprises the steps:
1) the trimming welding joint length a that the diameter dimension D of investigation reversing roller and average trimming shears cutter are cut, the sampling of trimming welding joint this 50, each length is designated as a
i, calculate average trimming welding joint length a=(a1+a2+ ... + a50)/50;
2) by reversing roller diameter D and trimming welding joint length a uniform units, calculate α=arctg(a/D); Set bending angle and depart from α along normal direction;
3) frequency n that need to commutate when investigation is produced with steel, sets bending times and does not ftracture for n+1 time as qualified;
4) trimming welding joint is put on described specimen holder, the position of removable crank spindle on rotating disk, adjusting bending angle is α;
5) rotate described rocking arm, the limit welding joint that liquidates carries out bending; If bending times reaches not cracking n+1 time, illustrate that welding joint is qualified, if trimming welding joint ftractures in Forging Process, illustrate that welding joint is defective.
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| CN201310731018.4A CN103743639A (en) | 2013-12-26 | 2013-12-26 | Method for detecting bending fatigue property of welding connector and bending machine |
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| CN201310731018.4A CN103743639A (en) | 2013-12-26 | 2013-12-26 | Method for detecting bending fatigue property of welding connector and bending machine |
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Cited By (5)
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| CN104764667B (en) * | 2015-03-31 | 2017-03-15 | 中国日用五金技术开发中心 | Stainless steel kitchenware neck fatigue strength tester and its method of testing |
| CN106990003A (en) * | 2017-05-04 | 2017-07-28 | 苏州正易鑫新能源科技有限公司 | A kind of anti-folding durable test device of photovoltaic cell |
| CN107611883A (en) * | 2017-11-13 | 2018-01-19 | 河南宏骏通信工程有限公司 | Cable fixed mount is used in a kind of communication equipment installation |
| CN109490093A (en) * | 2018-10-17 | 2019-03-19 | 欣强电子（清远）有限公司 | A kind of Rigid Flex bending angle device for detecting performance |
| CN116008072A (en) * | 2022-12-13 | 2023-04-25 | 北京京能建设集团有限公司 | Reinforced concrete beam testing device |
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| CN109490093A (en) * | 2018-10-17 | 2019-03-19 | 欣强电子（清远）有限公司 | A kind of Rigid Flex bending angle device for detecting performance |
| CN116008072A (en) * | 2022-12-13 | 2023-04-25 | 北京京能建设集团有限公司 | Reinforced concrete beam testing device |
| CN116008072B (en) * | 2022-12-13 | 2024-01-26 | 北京京能建设集团有限公司 | Reinforced concrete beam testing device |
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