CN103331345B - Stretch-bending forming device with insulated stretching head and forming method thereof - Google Patents
Stretch-bending forming device with insulated stretching head and forming method thereof Download PDFInfo
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- CN103331345B CN103331345B CN201310289518.7A CN201310289518A CN103331345B CN 103331345 B CN103331345 B CN 103331345B CN 201310289518 A CN201310289518 A CN 201310289518A CN 103331345 B CN103331345 B CN 103331345B
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Abstract
The invention discloses a stretch-bending forming device with an insulated stretching head and a forming method of the stretching-bending forming device. The insulated stretching head is arranged between a rotating support arm of a stretch-bending machine and a pneumatic chuck, and the two ends of insulated stretching head are connected with a rear cover of the pneumatic chuck and the rotating support arm of the stretch-bending machine respectively. An insulated working platform is arranged on the upper surface of a rotary table of the stretch-bending machine. A stretch-bending die is installed on the upper surface of the insulated working platform. A pulse power supply is located at one side of the rotary table of the stretch-bending machine and the pneumatic chuck, the pulse power supply keeps a safety distance from the rotary table of the stretch-bending machine and the pneumatic chuck, and a lead line of the pulse power supply is connected to a part to be formed. According to the stretch-bending forming device with the insulated stretching head, the insulated stretching head is used for achieving insulation between the part to be formed and a machine body of the stretch-bending machine, and therefore the safety of personnel and equipment are guaranteed. Due to applied electric plasticity stretching-bending forming, the resistance to deformation of materials is reduced, the forming limit of the materials is greatly improved, the surface quality and the comprehensive mechanical property of a product are improved, and the production quality and production efficiency of the part are improved. Besides, the stretch-bending forming device with the insulated stretching head is convenient to use, practical, simple in structure, easy to produce and manufacture, and good in insulation effect.
Description
Technical field
The present invention relates to shape stretch wrap forming technical field, specifically a kind of aluminium lithium alloy section bar Electroplastic stretch bending insulation pull head and building mortion.
Background technology
Stretch bending is formed in aircraft manufacturing the application obtained widely, be mainly used in the connectors such as shaping fuselage, bulkhead, rib, engine mount, adopt stretch bending process that part can be made to obtain rational school shape surplus, improve the accuracy of manufacture of part, reduce the manufacturing cost of part.But the raising day by day required along with processing precision of products, the resilience in existing stretch bending forming process, the wrinkling and skin defect such as to break highlights all the more, limits the application of traditional stretch wrap forming.
Chinese patent CN 102172689 (Electroplastic bending device for light metal section) describes a kind of Electroplastic bending device for light metal section, comprise mould, high energy pulse power supply and clamp, wherein the symmetrical and power end of clamp is connected with high energy pulse power supply about mould for two clamps, two chucks are symmetrically distributed in both sides, the axis formation electrode cavity of clamp, electrode insulation to be fixed in electrode cavity and to be connected with high energy pulse power supply, and the working portion surface of electrode cavity and mould scribbles alumina ceramic layer.But the method has following shortcoming: being coated with insulating barrier can because the friction in use procedure is damaged and coating aging comes off and occurs leaky, and the clamping force of this electroded special chuck and working strength are difficult to ensure different size stretch bending demand.Should ensure that high-density current is only added on section bar in Electroplastic stretch bending process, other parts will carry out strict insulation processing, the main body of stretch benders is all iron structure, very easily conduct electricity, hydraulic oil in the hydraulic gear of simultaneously stretch benders is met the function of current and can be caused fire, the common method being coated with insulating barrier at chuck and die surface, can because the friction in use procedure is damaged and coating aging comes off and occurs leaky, therefore, the quality of insulation processing is by the safety of the safety and machinery equipment that directly affect operating personnel.
Metal electric plasticity has very important application in engineering, if can this performance of research and utilization metal effectively, will have very large impetus to manufacturing industry.Aluminium lithium alloy is very potential structural material, its because of density low, easily the feature such as processing will by the industrial extensive use of aeronautical manufacture, but it also have impact on some performances because it is more crisp.If improve it by electro plasticity to stretch and stretch bending performance, its range of application of increase that can be larger.
Summary of the invention
The Insulation Problems of section bar and stretch benders rotating arm during for overcoming the Electroplastic stretch bending existed in prior art, and in stretch wrap forming process, produce resilience, defect that wrinkling and skin breaks, the present invention proposes one has insulation pull head stretch wrap forming device and manufacturing process.
Of the present invention have insulation pull head stretch wrap forming device to comprise stretch benders rotating arm, insulation pull head, pneumatic chuck, stretch benders turntable, insulated working platform, stretch bending mold and the pulse power.Insulation pull head is between stretch benders rotating arm and pneumatic chuck, and one end of insulation pull head is connected with pneumatic chuck bonnet, and the other end of insulation pull head is connected with stretch benders rotating arm, and insulated working platform is arranged on the upper surface of stretch benders turntable.Stretch bending mold is arranged on the upper surface of insulated working platform.The pulse power is positioned at the side of stretch benders turntable and pneumatic chuck, and and keep a safe distance between stretch benders turntable and pneumatic chuck; The extraction wire of the pulse power is connected on part to be formed.
Described insulation pull head comprises the first fixture block, insulating washer, the second fixture block, insulating sleeve, fastening bolt and insulation board.Insulation board is between the first fixture block and the second fixture block, and two end faces of insulation board are fitted with the bottom surface of the first fixture block and the second fixture block respectively.The installation through hole of multiple concentric insulating sleeve is evenly equipped with respectively at the end face of described first fixture block and the second fixture block.Multiple fastening bolt is respectively charged in each insulating sleeve, is connected by described first fixture block and tightens up with the second fixture block; Insulated at the end face of the first fixture block with between the end face of the second fixture block and each fastening bolt by insulating washer.
Described first fixture block larger diameter end is bare terminal end, the end face of this bare terminal end and insulation board surface engagement.First fixture block smaller diameter end is link.The end face of described first fixture block bare terminal end is distributed with the through hole of multiple installing insulating sleeve; And the centerline parallel of the center line of this through hole and the first fixture block.
Described second fixture block larger diameter end is bare terminal end, the end face of this bare terminal end and another surface engagement of insulation board.Second fixture block smaller diameter end is link; The end face of described second fixture block bare terminal end is distributed with the through hole of multiple installing insulating sleeve; And the center line of this through hole is concentric with the through hole on the end face of the first fixture block bare terminal end; All insulated paint is applied at the outer surface of the second fixture block.
The invention allows for a kind of method having insulation pull head stretch wrap forming device stretch wrap forming described in utilization, detailed process is:
The first step, clamping part to be formed.Lay insulation board on stretch benders turntable, is placed on mould on described insulation board.Part to be formed is placed on mould, and clamps with pneumatic chuck.
Second step, setting stretch benders parameter.The pulse power is connected on part to be formed.Described stretch benders parameter is: pulse current is 1200A, and current density is 120A/mm
2; Pulsatile once electricity is generated, each pulse persistance 0.03s every 30s.In whole stretch wrap forming, remain set stretch benders parameter.
3rd step, prestretched.In prestretched, pretension is by 0N multistage loadings to 6000N, and the amplification of every grade is 1000N, and the speedup of every grade is 16.6N/s, until load desired value reaches 6000N, completes the prestretched treating formation of parts.In described prestretched, multistage loadings pretension is: the pretension of stretch benders, from 0N, stops when pretension reaches 1000N loading 10s, makes stable load at 1000N; Adjustment pretension desired value is 2000N, stops loading 10s, make stable load at 2000N when pretension reaches 2000N; The rest may be inferred, until load desired value reaches 6000N.
4th step, bending forming.After prestretched terminates, bending forming is carried out to the part to be formed through prestretched.In bending forming, stretch benders turntable rotates 120 ° with 5 °/min, and stretch benders remain 6000N pulling force.Obtain the part of Electroplastic stretch wrap forming.
5th step, precision measure.
The present invention utilizes turntable type stretch bending machine, by insulation board, the first fixture block and the second fixture block joint are separated, reach the object of front and back end insulation, then insulating sleeve is put in the circular hole of flange and screw rod and flange are insulated, then the fastening bolt of insulating washer is had to be connected by each building block of pull head with cover, finally the first fixture block of pull head is connected with pneumatic chuck, by the screw thread place precession pneumatic chuck bonnet of leading portion flange, and carries out encapsulation process.
Section bar front end is placed on stretch bending mold by the present invention, again stretch bending mold is placed on insulated working platform, and clamp with the retaining part that stretch bending mold carries, other end pneumatic chuck clamps, the pulse power is received on section bar, owing to connecing the insulation pull head in the present invention after pneumatic chuck, section bar and stretch benders body can well be insulated by insulated working platform and insulation pull head like this, the safety of guarantee personnel and equipment, start turntable stretch-bending machine make pulse power supply carries out stretch bending process, along with the rotation of stretch benders turntable, section bar bends and coating mould.
The present invention makes full use of electro plasticity process principle, proposes a kind of Electroplastic stretch bending insulation pull head, for the insulation of pneumatic chuck and stretch benders rotating arm coupling part, prevents electric current from flowing on body with chuck.In addition, additionally provide a kind of Electroplastic stretch wrap forming device with this insulation pull head, the present invention can well ensure the insulating properties of section bar and stretch benders rotating arm, due to employing is insulating materials, damaged and the coating aging of the adjoint friction of surface spraying insulating layer approach can well be avoided to come off defect, the safety of operating personnel is guaranteed, namely the advantage that Electroplastic is shaped can be given full play to when ensureing safety, when being subject to the stimulation of electric pulse in material deformation district, the atom of material internal obtains energy, atomic vibration strengthens, thus accelerate dislocation motion, dislocation activation energy can be changed, open the entanglement between dislocation, it is made easily to overcome obstacle on slide surface, such material deformation is easier, reduce the resistance of deformation of material, significantly increase the forming limit of material, the percentage elongation about 8% of aluminium lithium alloy in no power situation, continue stretching and will occur fracture, and under adopting the effect of logical high energy pulse electric current, the percentage elongation of aluminium lithium alloy can bring up to about 15%, this just considerably increases the advantage of the bending forming of aluminium lithium alloy architrave class part, solving conventional stretch bending cannot the electro plasticity stretch wrap forming of formation of parts due to forming limit reason, in addition, electric pulse can improve the plastic deformation ability of metal material, promote the crystallization process of non-crystaline amorphous metal, the solidified structure of refining alloy, improve surface quality and the comprehensive mechanical property of product, solve the resilience in stretch bending forming process well, the quality problems such as wrinkling and skin breaks, improve the part quality of production and production efficiency, and the present invention is convenient and practical, structure is simple, be easy to processing and manufacturing, insulation effect is good.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the present invention is described further.
Fig. 1 is the structural representation of building mortion in the present invention.
Fig. 2 is the structural representation of insulation pull head.
Fig. 3 is the top view of the first fixture block.
Fig. 4 is the A-A sectional view of Fig. 3.
Fig. 5 is the structural representation of insulation board.
Fig. 6 is the structural representation of the second fixture block.
Fig. 7 is different current density and percentage elongation relation in electro plasticity processing, and in figure, transverse axis represents current density, and the longitudinal axis represents percentage elongation.
Fig. 8 is current density 110A/mm in electro plasticity processing
2under condition, different energising opportunity is on the impact of percentage elongation, and in figure, transverse axis a% represents in energising after material extending a%, and the longitudinal axis represents percentage elongation.Wherein:
1. stretch benders rotating arm, 2. insulation pull head, 3. pneumatic chuck, 4. stretch benders turntable, 5. insulated working platform, 6. stretch bending mold, the 7. pulse power, 8. section bar, 9. the first fixture block, 10. insulating washer, 11. second fixture blocks, 12. nuts, 13. insulating sleeves, 14. fastening bolts, 15. insulation boards.
Detailed description of the invention
Embodiment one
The present embodiment is the stretch wrap forming device of the aluminium lithium alloy T profile for thickness 2mm, obtains after improving to stretch benders of the prior art.
The present embodiment comprises stretch benders rotating arm 1, insulation pull head 2, pneumatic chuck 3, stretch benders turntable 4, insulated working platform 5, stretch bending mold 6, the pulse power 7 of building mortion.Wherein: insulation pull head 2 is between stretch benders rotating arm 1 and pneumatic chuck 3, the front end of insulation pull head 2 is threaded connection in the screwed hole of precession pneumatic chuck 3 bonnet, rear end and the stretch benders rotating arm 1 of insulation pull head 2 are bolted, insulated working platform 5 is installed to the upper surface of stretch benders turntable 4, the bottom surface of insulated working platform 5 and the upper surface of stretch benders turntable 4 are fitted, and be fastened by bolts, stretch bending mold 6 is installed to the upper surface of insulated working platform 5, the bottom surface of stretch bending mold 6 and the upper surface of insulated working platform 5 are fitted, and be fastened by bolts, the pulse power 7 is positioned at the side of stretch benders turntable 4 and pneumatic chuck 3, and do not contact with pneumatic chuck 3 with stretch benders turntable 4, keep a safe distance, one end of section bar 8 is positioned on stretch bending mold 6, the other end is positioned on pneumatic chuck 3, the extraction wire of the pulse power 7 is connected on section bar 8.
Described insulation pull head 2 comprises the first fixture block 9, insulating washer 10, second fixture block 11, insulating sleeve 13, fastening bolt 14 and insulation board 15.
Insulation board 15 is between the first fixture block 9 and the second fixture block 11, and two end faces of insulation board 15 are fitted with the bottom surface of the first fixture block 9 and the second fixture block 11 respectively.Be evenly equipped with 6 concentric through holes respectively at the end face of described first fixture block 9 and the second fixture block 11, the aperture of this through hole is identical with the external diameter of insulating sleeve 13.Insulating sleeve 13 quantity is 12, is placed in respectively in each through hole of described first fixture block 9 and the second fixture block 11 end face.6 fastening bolts 14 are respectively charged in each insulating sleeve on described first fixture block 9 and the second fixture block 11, be connected by this first fixture block 9 and tightened up by nut 12 with the second fixture block 11.Insulating washer 10 quantity is 12, the end face of the first fixture block 9 and being insulated by insulating washer 10 between the end face of the second fixture block 11 and each fastening bolt 14.
Described first fixture block 9 is revolving body, makes with 45# steel, for connecting pneumatic chuck 3 and the second fixture block 11.The profile of the first fixture block 9 is in " T " font.First fixture block 9 larger diameter end is bare terminal end, the end face of this bare terminal end and insulation board surface engagement.First fixture block 9 smaller diameter end is threaded ends, for being connected with the bonnet of pneumatic chuck 3 by this first fixture block 9.The end face of described first fixture block 9 bare terminal end is distributed with the through hole of 6 installing insulating sleeves 13; And the centerline parallel of the center line of this through hole and the first fixture block 9.
Described second fixture block 11 is revolving body, makes with 45# steel, for connecting the first fixture block 11 and stretch benders rotating arm 1.The profile of described second fixture block 11 is in " T " font.Second fixture block 11 larger diameter end is bare terminal end, the end face of this bare terminal end and another surface engagement of insulation board.Second fixture block 11 smaller diameter end is link, has the plane coordinated with stretch benders rotating arm 1 in the termination of this link, during connection, is inserted by the link of the second fixture block 11 in the jaw of stretch benders rotating arm 1, and is fixed by pin.For ensureing safety and stretch bending effect, all apply insulated paint at the outer surface of the second fixture block 11.
In the present embodiment, thickness and second fixture block 11 of the first fixture block 9 bare terminal end are that the thickness of bare terminal end is identical, are 40mm.
Described insulating sleeve 13 high-strength phenolic resin laminate is made, and described insulating washer 10 high strength zirconia ceramics is made.
In the present embodiment, the described pulse power is middle mountain precious occasion board high energy pulse Switching Power Supply, its relevant parameter is as follows, export DC current: 0 ~ 200A, 400A, 600A ... 30000A is adjustable, pulse duty factor: 0 ~ 100% continuously adjustabe, pulse frequency: 0 ~ 20000HZ continuously adjustabe, according to the size of the size regulation output DC current of concrete formation of parts.
Embodiment two
The present embodiment is the method utilizing aluminium lithium alloy T profile that the pull head stretch wrap forming device Electroplastic stretch wrap forming thickness that to insulate described in embodiment 1 is 2mm.Described T profile depth of section is 28mm, mold radius of curvature 250mm.
In the present embodiment, the tensile force of the main stretching cylinder of described turntable stretch-bending machine is 0-8T, and main stretching cylinder range is 2000mm, and main stretching cylinder operating rate is 0-12mm/s, and turntable diameter is 1000mm, and electrode general power is 30.8kw.
Detailed process is:
The first step, clamping part to be formed.Lay insulation board on stretch benders turntable, is placed on mould on described insulation board.Aluminium lithium alloy T profile is placed on mould, and with pneumatic chuck clamping, completes the installation of part to be formed.Described insulation board adopts high-strength phenolic resin laminate.
Second step, setting stretch benders parameter.The pulse power is connected in aluminium lithium alloy T profile.Setting pulse current is 1200A, and current density is 120A/mm
2, generate pulsatile once electricity every 30S, each pulse persistance 0.03S.In whole stretch wrap forming, remain set stretch benders parameter.
3rd step, prestretched.Start stretch benders, carry out prestretched.Pretension is by 0N multistage loadings to 6000N, and the amplification of every grade is 1000N, and the speedup of every grade is 16.6N/S, and specifically, the pretension of stretch benders, from 0N, is loaded into 1000N with the speedup of 16.6N/S, stops loading 10S, makes stable load at 1000N.Adjustment pretension desired value is 2000N, and is loaded into 2000N with the speedup of 16.6N/S, stops loading 10S, makes stable load in this desired value.Repeat said process, until load desired value reaches 6000N, complete the prestretched to aluminium lithium alloy T profile.
4th step, bending forming.After prestretched terminates, bending forming is carried out to described aluminium lithium alloy T profile.In bending forming, stretch benders turntable rotates 120 ° with 5 °/min, and stretch benders remain 6000N pulling force.Obtain the aluminium lithium alloy T profile of Electroplastic stretch wrap forming.
5th step, precision measure.After stretch bending terminates, powered-down and stretch benders, take off stretch bending part, contrasts with conventional stretch bending part, measures forming accuracy.
Stretch bending part is observed after off-test, do not find the defects such as wrinkling and skin breaks, and surface quality of workpieces is better, and have higher dimensional accuracy, bending radius is now 250mm, and during conventional stretch bending same size aluminium lithium alloy T profile, just there is outer fracture phenomena when bending radius is 400mm, it can thus be appreciated that electro plasticity stretch bending can reduce the resistance of deformation of material, significantly increase the forming limit of material, improve the surface quality of product simultaneously, improve lumber recovery.
Embodiment three
The present embodiment is the method utilizing aluminium lithium alloy T profile that the pull head stretch wrap forming device Electroplastic stretch wrap forming thickness that to insulate described in embodiment 1 is 2mm.Described T profile depth of section is 50mm, mold radius of curvature 450mm.
In the present embodiment, the tensile force of the main stretching cylinder of described turntable stretch-bending machine is 0-8T, and main stretching cylinder range is 2000mm, and main stretching cylinder operating rate is 0-12mm/s, and turntable diameter is 1000mm, and electrode general power is 30.8kw.
Detailed process is:
The first step, clamping part to be formed.Lay insulation board on stretch benders turntable, is placed on mould on described insulation board.Aluminium lithium alloy T profile is placed on mould, and with pneumatic chuck clamping, completes the installation of part to be formed.Described insulation board adopts high-strength phenolic resin laminate.
Second step, setting stretch benders parameter.The pulse power is connected in aluminium lithium alloy T profile.Setting pulse current is 1600A, generates pulsatile once electricity every 30S, each pulse persistance 0.03S.In whole stretch wrap forming, remain set stretch benders parameter.
3rd step, prestretched.Start stretch benders, carry out prestretched.Pretension is by 0N multistage loadings to 7000N, and the amplification of every grade is 1000N, and the speedup of every grade is 16.6N/S, and specifically, the pretension of stretch benders, from 0N, is loaded into 1000N with the speedup of 16.6N/S, stops loading 10S, makes stable load at 1000N.Adjustment pretension desired value is 2000N, and is loaded into 2000N with the speedup of 16.6N/S, stops loading 10S, makes stable load in this desired value.Repeat said process, until load desired value reaches 7000N, complete the prestretched to aluminium lithium alloy T profile.
4th step, bending forming.After prestretched terminates, bending forming is carried out to described aluminium lithium alloy T profile.In bending forming, stretch benders turntable rotates 120 ° with 5 °/min, and stretch benders remain 7000N pulling force.Obtain the aluminium lithium alloy T profile of Electroplastic stretch wrap forming.
5th step, precision measure.Powered-down and stretch benders, take off stretch bending part, contrasts with conventional stretch bending part, observes forming quality.
Stretch bending part is observed after off-test, do not find the defects such as wrinkling and skin breaks, and surface quality of workpieces is better, and have higher dimensional accuracy, bending radius is now 250mm, and during conventional stretch bending same size aluminium lithium alloy T profile, just there is outer fracture phenomena when bending radius is 400mm, it can thus be appreciated that electro plasticity stretch bending can reduce the resistance of deformation of material, significantly increase the forming limit of material, improve the surface quality of product simultaneously, improve lumber recovery.
Claims (6)
1. there is an insulation pull head stretch wrap forming device, it is characterized in that, comprise stretch benders rotating arm, insulation pull head, pneumatic chuck, stretch benders turntable, insulated working platform, stretch bending mold and the pulse power; Insulation pull head is between stretch benders rotating arm and pneumatic chuck, and one end of insulation pull head is connected with pneumatic chuck bonnet, and the other end of insulation pull head is connected with stretch benders rotating arm, and insulated working platform is arranged on the upper surface of stretch benders turntable; Stretch bending mold is arranged on the upper surface of insulated working platform; The pulse power is positioned at the side of stretch benders turntable and pneumatic chuck, and and keep a safe distance between stretch benders turntable and pneumatic chuck; The extraction wire of the pulse power is connected on part to be formed.
2. one has insulation pull head stretch wrap forming device as claimed in claim 1, and it is characterized in that, described insulation pull head comprises the first fixture block, insulating washer, the second fixture block, insulating sleeve, fastening bolt and insulation board; Insulation board is between the first fixture block and the second fixture block, and two end faces of insulation board are fitted with the bottom surface of the first fixture block and the second fixture block respectively; The installation through hole of multiple concentric insulating sleeve is evenly equipped with respectively at the end face of described first fixture block and the second fixture block; Multiple fastening bolt is respectively charged in each insulating sleeve, is connected by described first fixture block and tightens up with the second fixture block; Insulated at the end face of the first fixture block with between the end face of the second fixture block and each fastening bolt by insulating washer.
3. one has insulation pull head stretch wrap forming device as claimed in claim 1, and it is characterized in that, the first fixture block larger diameter end is bare terminal end, the end face of this bare terminal end and insulation board surface engagement; First fixture block smaller diameter end is link; The end face of described first fixture block bare terminal end is distributed with the through hole of multiple installing insulating sleeve; And the centerline parallel of the center line of this through hole and the first fixture block.
4. one has insulation pull head stretch wrap forming device as claimed in claim 1, and it is characterized in that, the second fixture block larger diameter end is bare terminal end, the end face of this bare terminal end and another surface engagement of insulation board; Second fixture block smaller diameter end is link; The end face of described second fixture block bare terminal end is distributed with the through hole of multiple installing insulating sleeve; And the center line of this through hole is concentric with the through hole on the end face of the first fixture block bare terminal end; All insulated paint is applied at the outer surface of the second fixture block.
5. utilize the method having insulation pull head stretch wrap forming device stretch wrap forming described in claim 1, it is characterized in that, detailed process is:
The first step, clamping part to be formed; Lay insulation board on stretch benders turntable, is placed on mould on described insulation board; Part to be formed is placed on mould, and clamps with pneumatic chuck;
Second step, setting stretch benders parameter; The pulse power is connected on part to be formed; Described stretch benders parameter is: pulse current is 1200A, and current density is 120A/mm
2; Pulsatile once electricity is generated, each pulse persistance 0.03s every 30s; In whole stretch wrap forming, remain set stretch benders parameter;
3rd step, prestretched; In prestretched, pretension is by 0N multistage loadings to 6000N, and the amplification of every grade is 1000N, and the speedup of every grade is 16.6N/s, until load desired value reaches 6000N, completes the prestretched treating formation of parts;
4th step, bending forming; After prestretched terminates, bending forming is carried out to the part to be formed through prestretched; In bending forming, stretch benders turntable rotates 120 ° with 5 °/min, and stretch benders remain 6000N pulling force; Obtain the part of Electroplastic stretch wrap forming;
5th step, precision measure.
6. utilize the method having insulation pull head stretch wrap forming device stretch wrap forming as claimed in claim 5, it is characterized in that, in described prestretched, multistage loadings pretension is: the pretension of stretch benders, from 0N, stops when pretension reaches 1000N loading 10s, makes stable load at 1000N; Adjustment pretension desired value is 2000N, stops loading 10s, make stable load at 2000N when pretension reaches 2000N; The rest may be inferred, until load desired value reaches 6000N.
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| CN201310289518.7A CN103331345B (en) | 2013-07-10 | 2013-07-10 | Stretch-bending forming device with insulated stretching head and forming method thereof |
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| CN201310289518.7A CN103331345B (en) | 2013-07-10 | 2013-07-10 | Stretch-bending forming device with insulated stretching head and forming method thereof |
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| CN201714853U (en) * | 2010-06-03 | 2011-01-19 | 河南起重机器有限公司 | Insulating coupler |
| CN102172689A (en) * | 2011-01-26 | 2011-09-07 | 上海交通大学 | Electroplastic bending device for light metal section |
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