CN104818441A - Biaxial bending deformation device and processing method for processing welded joint - Google Patents
Biaxial bending deformation device and processing method for processing welded joint Download PDFInfo
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Abstract
The invention provides a biaxial bending deformation device and a processing method for processing a welded joint. The biaxial bending deformation device comprises a heating heat preservation device, a plate feeding roller group, a plurality of pairs of curved roller groups, a plurality of pairs of rolling roller groups and a passage penetrating through all heat preservation layers, plate feeding roller group, curved roller groups and rolling roller groups, wherein the passage is divided into a horizontal section and a curved section, the heating heat preservation device, the plate feeding roller group and the rolling roller groups are arranged on the horizontal section, the curved roller groups are arranged on the curved section, the curved section comprises a plurality of concave curved surfaces and convex curved surfaces, which are alternately arranged, the curved roller groups include an upper curved roller group and a lower curved roller group, the upper curved roller group is arranged on the convex curved surface, and the lower curved roller group is arranged on the concave curved surface. By adopting the biaxial bending deformation device, a weld seam of the welded joint can be extended to certain extent, so that the residual stress can be reduced, and crystalline grains can be refined; and the biaxial bending deformation device is particularly suitable for the welded joint with relatively low mechanical performance.
Description
Technical field
The invention belongs to weldprocedure field, particularly, relate to a kind of the compound bending deformation device and the treatment process thereof that process welding joint.
Background technology
Welding is mild alloy product, the key technology of processing of particularly magnesium-alloy material manufacture, but magnesium alloy welding performance is bad, is difficult to realize reliable connection.Magnesium alloy structural part and the connection between magnesium alloy and other material structure part for this reason, becomes one of the technical bottleneck and gordian technique urgently to be resolved hurrily of the application of restriction magnesium alloy.The reliability of magnesium alloy weld joint has become the pressing issues of its application, current magnesium alloy is being applied to the manufacture of numerous load bearing structure part, as magnesium alloy frame of handwheel, power system automatic gear-box, the oil end, magnesium alloy pipe automobile chassis etc. in automobile industry.Strength of welded joint, the problem such as plasticity and fatigue property of these load bearing structure parts are the most basic of product safety reliability and most important evaluation index.Data shows, in the inefficacy of magnesium alloy welding structure, many accidents are because the fracture of welding joint causes.In practical engineering application, many welded constructions are all be on active service under the moving load of alternation, now iff static load tensile strength or the yield strength of considering welding joint, so welded construction is easy to just failure fracture occur during normal service, cause larger engineering accident, so the fatigue strength performance of welding joint under repeated load must be taken into full account when structure design, and for magnesium alloy welding structure, repeated stress failure is also a kind of principal mode that it lost efficacy, the welded construction failure fracture accident caused by fatigue cracking accounts for more than 80% of total fracture accident.Magnesium alloy welding structure can be subject to the effect of various vibration, pulsed load or repeated load in engineer applied, the threat of these load to its security used and working life is very big, fatigue cracking forming core and the micro-crack extension of structure can be caused, particularly magnesium alloy joint made by flame welding.Due to the feature of technique for welding itself and the physical and chemical performance of magnesium alloy self, magnesium alloy weld joint is caused to there is following shortcoming:
1. the discontinuity of joints, certainly will cause the intersection of reinforcement and mother metal to have stress concentration phenomenon;
2. the discontinuity of joint microstructure, the heat affected zone grain structure of magnesium alloy joint is thicker than organizing of weld seam and mother metal, the uneven microstructure of whole joint, discontinuous;
3. due to the shrinkability of weld metal, can unrelieved stress be produced near joints, reduce the mechanical property of joint;
4. joint has welding flaw, because the chemical property of magnesium alloy is active, inevitably has the welding flaw such as pore, slag inclusion and occur in welding process;
5. joint appearance unfairness, unsightly.
In Welding Technology of Magnesium Alloy, solving its welding joint obdurability, is the prerequisite guaranteeing that magnesium alloy welding structure is applied.Existing research at present have employed different welding processs and means are eliminated or weaken the above-mentioned shortcoming of magnesium alloy weld joint, but these methods are very limited to the resolution ability of the problems referred to above.Because magnesium alloy has the characteristic such as high thermal conductivity, the large coefficient of expansion, lower fusing point and boiling point; make easily to produce overheated structure and coarse grains in magnesium alloy weld seam Ji Jinfeng district; this coarse grain directly can affect the mechanical property of joint; magnesium can also form fragility nitride by strong chemical combination with the nitrogen in air, reduces the mechanical property of joint.
Summary of the invention
The present invention is in order to solve the above-mentioned defect and deficiency that exist in prior art, provide a kind of the compound bending deformation device and the treatment process thereof that process welding joint, the weld seam of welding joint can be made to obtain certain extension, unrelieved stress can be reduced, simultaneously can crystal grain thinning, substantially increase intensity and the plasticity of welding joint, and then improve the fatigue property of welding joint, be particularly suitable for the welding joint that mechanical property is lower.
For solving the problems of the technologies described above, the invention provides a kind of compound bending deformation device processing welding joint, comprise the heating and heat-insulating device set gradually, send plate roller set, some to bend roller set and rolling roller set and run through described thermal insulation layer, send plate roller set, the passage of bend roller set and rolling roller set, described passage is divided into horizontal section and bend section, described heating and heat-insulating device, plate roller set and rolling roller set is sent to be placed in described horizontal section place, described bend roller set is placed in described bend section place, described bend section comprises several concave curved surface be arranged alternately and convex surfaces, described bend roller set comprises bend roller set and lower bend roller set, described upper bend roller set is placed in described convex surface place, described lower bend roller set is placed in described concave curved surface place.
Preferably, the summit of described convex surface and described horizontal section flush.
Preferably, the vertical range between the summit of described convex surface and the summit of described concave curved surface is 3-10mm.
Preferably, the vertical range between the summit of described convex surface and the summit of described concave curved surface is 5mm.
Preferably, the roller of described bend roller set is hollow, and the inside is provided with heating unit.
Preferably, described heating unit is resistor rod.
Utilize the method for compound bending deformation device process welding joint, comprise the following steps:
Step one, adopts the argon arc welding of tungsten level to carry out welding motherboard, obtains welding defect welding joint;
Step 2, welding joint flows slowly over heating and heat-insulating device by utilizing the horizontal section of passage, and the temperature in described heating and heat-insulating device is 150-200 DEG C, and welding joint is 2.0-3.0mm/s through the speed of heating and heat-insulating device;
Step 3, the bending section of welding joint admission passage under the effect sending plate roller set out in heating and heat-insulating device, welding joint is made to produce gradient crystal grain by the effect of bending section bend roller set, finally undertaken rolling sizing by rolling roller set, the described pressure at plate roller set place that send is 50-100MPa, and the pressure at described rolling roller set place is 0-100MPa.
Preferably, described bending section comprises several convex surface be arranged alternately and concave curved surfaces.
Preferably, described convex surface place is provided with bend roller set, and described concave curved surface place is provided with lower bend roller set.
Preferably, the vertical range between the summit of described convex surface and the summit of described concave curved surface is 5mm.
The Advantageous Effects that the present invention reaches:
1. joint is suppressed level, eliminate discontinuity and the stress concentration phenomenon of profile, realize weld seam to mother metal gentle transition;
2. compound bending distortion is by multidirectional compression set, in joint accumulation twinning deformation, produces twin, and along with the increase of bending passage, final formation upper and lower surface twin density is large, the symmetric gradient tissue that intermediate density is little;
3. adopt compound bending distortion that the weld metal of contraction can be made to obtain to extend, can be correcting deformed and regulate the distribution of internal stress, the weld seam partial heat treatment before simultaneously bending, can eliminate welding residual stress;
4. compound bending distortion can weaken or eliminate the defect such as pore, slag inclusion;
5. after compound bending distortion, then through compacting roller set, joint can be made smooth attractive in appearance.
Accompanying drawing explanation
Fig. 1 compound bending deformation device structural representation;
The metallographic structure of Fig. 2 after the process of compound bending deformation device with without the magnesium alloy weld joint of compound bending deformation device process contrasts picture;
Fig. 3 mother metal, welding joint, mechanical curves collection of illustrative plates through the welding joint of compound bending deformation device process.
Embodiment
In order to the technique effect that auditor can better understand technical characteristic of the present invention, technology contents and reach, now accompanying drawing of the present invention is described in detail in conjunction with the embodiments.But shown accompanying drawing, just in order to technical scheme of the present invention is better described, is not actual proportions of the present invention and best configuration, so, ask auditor not with regard to ratio and the configuration of accompanying drawing, limit claims of the present invention.
Below in conjunction with drawings and Examples, patent of the present invention is further illustrated.
As shown in Figure 1, the invention provides a kind of compound bending deformation device processing welding joint, comprise the heating and heat-insulating device set gradually, send plate roller set, some to bend roller set and rolling roller set and run through described thermal insulation layer, send plate roller set, the passage of bend roller set and rolling roller set, described passage is divided into horizontal section and bend section, described heating and heat-insulating device, plate roller set and rolling roller set is sent to be placed in described horizontal section place, described bend roller set is placed in described bend section place, described bend section comprises several concave curved surface be arranged alternately and convex surfaces, described bend roller set comprises bend roller set and lower bend roller set, described upper bend roller set is placed in described convex surface place, described lower bend roller set is placed in described concave curved surface place.Summit and the described horizontal section of described convex surface flush.Vertical range between the summit of described convex surface and the summit of described concave curved surface is 3-10mm.Preferably, the vertical range between the summit of described convex surface and the summit of described concave curved surface is 5mm.The roller of described bend roller set is hollow, and the inside is provided with heating unit.Preferably, described heating unit is resistor rod.
Utilize the method for compound bending deformation device process welding joint, comprise the following steps:
Step one, adopts the argon arc welding of tungsten level to carry out welding motherboard, obtains welding defect welding joint;
Step 2, welding joint flows slowly over heating and heat-insulating device by utilizing the horizontal section of passage, and the temperature in described heating and heat-insulating device is 150-200 DEG C, and welding joint is 2.0-3.0mm/s through the speed of heating and heat-insulating device;
Step 3, the bending section of welding joint admission passage under the effect sending plate roller set out in heating and heat-insulating device, welding joint is made to produce gradient crystal grain by the effect of bending section bend roller set, finally undertaken rolling sizing by rolling roller set, the described pressure at plate roller set place that send is 50-100MPa, the pressure at described rolling roller set place is 0-100MPa, states bending section and comprises several convex surface be arranged alternately and concave curved surfaces.Described convex surface place is provided with bend roller set, and described concave curved surface place is provided with lower bend roller set.Vertical range between the summit of described convex surface and the summit of described concave curved surface is 5mm.
In addition, it should be noted that, the present invention is applicable to the welding joint that process sheet metal thickness is less than or equal to 2mm, its principle is constantly bent up and down by convex surface and concave curved surface, make welding joint place produce gradient crystal grain, thus make the upper and lower surface crystal grain of welding joint tiny, middle crystal grain is slightly large, both ensure that intensity like this, in turn ensure that plasticity simultaneously.
Embodiment
The present invention is particularly suitable for the lower welding joint of mechanical property, as magnesium alloy weld joint, welded joints in aluminium alloy.In order to welding joint treatment effect of the present invention is described, the Mg-Al system AZ31 magnesium alloy plate that the author selects Shandong Yin Guangmei industry company limited to provide is as test mother metal.
1) raw-material selection
Test plate (panel) is of a size of 2000mm × 600mm × 2mm, welding material select the said firm to provide with the AZ31 magnesium alloy solder wire of mother metal homogeneity, specification is φ 3.0mm.The main chemical compositions of magnesium alloy mother metal and mechanical property are in table 1 and table 2:
The chemical composition (wt.%) of table 1 AZ31 magnesium alloy
The mechanical property of table 2 AZ31 magnesium alloy
2) Welding Method & Equipment are chosen
1 secondary jam welding test plate (panel) is formed with the 2 blocks of sheet materials being of a size of 2000mm × 600mm × 2mm.Test piece for welding opens the double V-groove of 60 °, and root opening controls at 3 ~ 4mm.Remove the greasy dirt on test plate (panel) surface with acetone, by within welding region 20-30mm with sand papering to exposing metalluster, groove face removes oxide film through scraping, ensures that the region to be welded before welding starts does not have pollutent.Test adopts TPS4000 digitizing argon arc welding/soldering multi-functional welding equipment to carry out manual welding, and tungsten electrode end grinder buffing becomes semisphere, and diameter is 2.5mm, nozzle diameter 7mm, electric arc height 4mm.Front welding 2 layers during welding, back side welding 1 layer, forms the double welded joint with certain reinforcement.
3) welding joint process
Allow welding joint according to treatment process provided by the invention through the process of compound bending deformation device, by the two-way alternating bending of convex surface-concave curved surface, carry out the flexural deformation of 6 passages altogether, a convex surface or a concave curved surface are 1 passage, the wherein temperature 150 DEG C ~ 200 DEG C of heating and heat-insulating device, send the pressure of plate roller set to be 100MPa, the pressure of rolling roller set is 100MPa, send plate speed to be 2mm/s.
4) stuctures and properties characterizes
As shown in Figure 2, wherein (a) is the metallurgical tissue picture of the magnesium alloy weld joint through the process of compound bending deformation device, b () is the metallurgical tissue picture of the magnesium alloy weld joint without the process of compound bending deformation device, as seen from the figure, through the process of compound bending deformation device AZ31B magnesium alloy weld joint through alternating bending distortion after, the little crystal grain in weld metal zone still remains equiax crystal pattern, there is less twinning therein, and in larger crystal grain, there is obvious twin phenomenon, and have many twins parallel to each other.As can be seen from the figure, accumulate more twinning deformation in the weld seam surface layer grain after bending, the nearly surface of weld seam creates the twin of more intersection.Weld face twin density is comparatively large, and volume fraction is substantially saturated, and the little crystal grain of generation mainly appears at crystal boundary and twin boundary place, and little crystal grain is in being similar to strip arrangement.In bending deformation process, the distortion of being out of shape weld metal zone has been coordinated in the slippage of little crystal particle crystal boundary; Middle layer only has a small amount of twin to produce all the time, and materials tend is in forming the gradient structure that top layer twin density is large, middle layer twin density is little.
Fig. 3 mother metal, welding joint, mechanical curves collection of illustrative plates through the welding joint of compound bending deformation device process, as seen from the figure, the tensile strength of the welding joint after the process of compound bending deformation device can reach 230MPa, the tensile strength measured result of AZ31 magnesium alloy (no-welding-seam) mother metal is 238MPa, illustrate that welding joint is after compound bending deformation process, tensile strength has reached 96.6% of base metals.And the tensile strength of as-welded joint is usually between 150 ~ 190MPa, only have 60% ~ 75% of base metals tensile strength.Therefore can think that the strength of joint of postwelding compound bending deformation process is close to the strength level of base metals, strength of joint tool improves significantly.From the elongation of tension test, the elongation of as-welded joint is between 6% ~ 8%, and the joint elongation after compound bending distortion is usually between 11% ~ 16%.
In sum, the various mechanical performance indexs of the welding joint of AZ31 magnesium alloy TIG welding after the process of compound bending deformation device are all better than as-welded joint, the high temperature dynamic plasticity distortion of two-way alternating bending promotes disperse educt and the diffusion of welding joint supersaturation alloying element homogenizing of the inner strengthening phase of nonequilibrium freezing welding joint structure, the intensity of magnesium alloy weld joint and plasticity is made all to be better than as-welded joint, close to mother metal performance.The fracture location of magnesium alloy joint made by flame welding mainly occurs in heat affected zone, is also the position often occurring phenomenon of rupture near the fusion area of heat affected zone.The reduction of joint performance main and heat affected zone Grain Boundary Melting Down, grain coarsening and brittlement phase β-Mg
17al
12distribution along crystal boundary is relevant.
Below disclose the present invention with preferably embodiment, so it is not intended to limiting the invention, allly takes equivalent replacement or technical scheme that the scheme of equivalent transformation obtains, all drops in protection scope of the present invention.
Claims (10)
1. process the compound bending deformation device of welding joint, it is characterized in that: comprise the heating and heat-insulating device set gradually, send plate roller set, some to bend roller set and rolling roller set and run through described thermal insulation layer, send plate roller set, the passage of bend roller set and rolling roller set, described passage is divided into horizontal section and bend section, described heating and heat-insulating device, plate roller set and rolling roller set is sent to be placed in described horizontal section place, described bend roller set is placed in described bend section place, described bend section comprises several concave curved surface be arranged alternately and convex surfaces, described bend roller set comprises bend roller set and lower bend roller set, described upper bend roller set is placed in described convex surface place, described lower bend roller set is placed in described concave curved surface place.
2. the compound bending deformation device of process welding joint according to claim 1, is characterized in that: summit and the described horizontal section of described convex surface flush.
3. the compound bending deformation device of process welding joint according to claim 1, is characterized in that: the vertical range between the summit of described convex surface and the summit of described concave curved surface is 3-10mm.
4. the compound bending deformation device of process welding joint according to claim 3, is characterized in that: the vertical range between the summit of described convex surface and the summit of described concave curved surface is 5mm.
5. the compound bending deformation device of process welding joint according to claim 1, is characterized in that: the roller of described bend roller set is hollow, and the inside is provided with heating unit.
6. the compound bending deformation device of process welding joint according to claim 5, is characterized in that: described heating unit is resistor rod.
7. utilize the method for compound bending deformation device process welding joint, it is characterized in that: comprise the following steps:
Step one, adopts the argon arc welding of tungsten level to carry out welding motherboard, obtains welding defect welding joint;
Step 2, welding joint flows slowly over heating and heat-insulating device by utilizing the horizontal section of passage, and the temperature in described heating and heat-insulating device is 150-200 DEG C, and welding joint is 2.0-3.0mm/s through the speed of heating and heat-insulating device;
Step 3, the bending section of welding joint admission passage under the effect sending plate roller set out in heating and heat-insulating device, welding joint is made to produce gradient crystal grain by the effect of bending section bend roller set, finally undertaken rolling sizing by rolling roller set, the described pressure at plate roller set place that send is 50-100MPa, and the pressure at described rolling roller set place is 0-100MPa.
8. the method utilizing compound bending deformation device process welding joint according to claim 7, is characterized in that: described bending section comprises several convex surface be arranged alternately and concave curved surfaces.
9. the method utilizing compound bending deformation device process welding joint according to claim 8, it is characterized in that: described convex surface place is provided with bend roller set, described concave curved surface place is provided with lower bend roller set.
10. the method utilizing compound bending deformation device process welding joint according to claim 8, is characterized in that: the vertical range between the summit of described convex surface and the summit of described concave curved surface is 5mm.
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| CN105642714A (en) * | 2016-01-11 | 2016-06-08 | 上海应用技术学院 | Rolling device for manufacturing sheet metal gradient structure |
| CN107083477A (en) * | 2017-04-22 | 2017-08-22 | 南京工程学院 | One kind realizes welding point full-automatic bidirectional multi-angle flexural deformation device and its application method |
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Effective date of registration: 20190701 Address after: 214253 New Town of Yixing City, Wuxi City, Jiangsu Province Patentee after: Wuxi Tongrui Electric Power Automation Equipment Co.,Ltd. Address before: 211167 1 Hong Kong Avenue, Jiangning Science Park, Nanjing, Jiangsu Patentee before: Nanjing Institute of Technology |