CN102581091A - Flexible core mold for bending thin-wall rectangular tube - Google Patents
Flexible core mold for bending thin-wall rectangular tube Download PDFInfo
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- CN102581091A CN102581091A CN2012100442031A CN201210044203A CN102581091A CN 102581091 A CN102581091 A CN 102581091A CN 2012100442031 A CN2012100442031 A CN 2012100442031A CN 201210044203 A CN201210044203 A CN 201210044203A CN 102581091 A CN102581091 A CN 102581091A
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Abstract
The invention provides a flexible core mold for bending a thin-wall rectangular tube. A core rod fixing block is fixed to a step plane at one end of a core rod body to form a core rod, wherein a columned groove at one end of the core rod fixing block is matched with a columned head of an inserting groove core print; the columned groove at the end face of the core rod body is matched with the columned head of an inserting block core print; a plurality of inserting block core prints and a plurality of inserting groove core rods are provided, and are matched to form flexible core prints; the core prints in each group are connected by pins; a tail core print is arranged at the other end of the flexible core print, with the columned head inserted into the columned grooves of the inserting groove core print and the inserting block core print and connected by pins; the columned heads of multiple core prints are matched with the columned groove in a rotating way; and when bending the rectangular tube, the core prints can be freely rotated around the pins so as to meet the requirements of bending forming curvature of the rectangular tube. The flexible core mold provided by the invention is compact in structure; various components are tightly connected; the key parts are convenient to replace; wrinkling and pull crack can be effectively removed, and defects such as cross section distortion and the like can be reduced.
Description
Technical field
The present invention relates to a kind of numerical controlled bending of pipe processing mold, specifically is a kind of crooked flexible core of thin-walled rectangular tube minor radius that is used for.
Background technology
Be called thin-walled rectangular tube for the ratio of the thickness of tube wall and the width of pipe less than 1/15 rectangular tube.Aluminium alloy thin-walled rectangular tube bool because have that in light weight, vibration absorption ability is strong, advantage such as bandwidth and loss of signal are little, be widely used in fields such as radar, ground satellite station and microwave measurement.Yet because thin-walled rectangular tube hollow, thin-walled, in its BENDING PROCESS, very easily produce defectives such as wrinkling, cross section distortion and drawing crack, have a strong impact on its forming accuracy.Core can effectively prevent above-mentioned generation of defects.Yet along with the oriented wall thickness factor of bend pipe part is bigger and bending radius is littler trend development and compact conformation and spatial complexization to the improving constantly of bend pipe spare inner surface quality requirement, existing core is difficult to meet the demands.Therefore be necessary to develop the crooked flexible core of a kind of thin-walled rectangular tube minor radius, to satisfy the requirement of modern industry to bend pipe spare.
Hydraulic pressure commonly used, the grains of sand, steel core core etc. are filled as core in the thin-walled rectangular tube BENDING PROCESS at present.The hydraulic pressure filler attached on the pipe fitting inner surface, influences its internal accuracy easily.Grains of sand filler scratches inner surface easily, and is difficult to abundant filling.The steel core core mainly contains arc formula core, rectangle circular arc head core, steel band and chain type core etc.Arc formula core and rectangle circular arc head core are simple in structure, and its underpart is straight, and the rectangular tube inboard is not almost had supporting role, can not eliminate wrinkling effectively and are easy to cause pipe fitting to break, and it is crooked to adapt to the thin-walled rectangular tube minor radius.The filling of steel band and taking-up are relatively wasted time and energy, and use inconvenience, and scratch the pipe fitting inner surface easily.Chain type core structure is compact inadequately, flexible.For the shaping of going for a stroll of the circular pipe fitting of thin-walled, the spherical flexible core is arranged at present in addition, it mainly is applicable to thin-wall circular tube.And its core print is an integral body, in BENDING PROCESS, occurs core print easily and rotates inharmonic phenomenon.Because rectangular tube has the existence of rib muscle,, and be not easy by abundant filling so the rectangular tube material is mobile inhomogeneous.Therefore use present core, the rectangular pipe fittings that bends to be prone to defectives such as wrinkling, cross section distortion and drawing crack, have a strong impact on the forming quality of pipe fitting.
Summary of the invention
Compact inadequately, flexible in order to overcome existing thin-walled rectangular tube minor radius snake core mould structure, the defective that relative bending radius is inadequately little the present invention proposes a kind of crooked flexible core of thin-walled rectangular tube that is used for.
The present invention includes mandrel body, plug fixture block, inserted block core print, slot core print, tail core print; The plug fixture block is fixed on the cascaded surface of mandrel body one end, has formed plug; The cylinder nest of plug fixture block one end matches with the socket cap of slot core print, and the cylinder nest of mandrel body end face matches with the socket cap of inserted block core print; Inserted block core print and slot core print all have a plurality of; Inserted block core print and slot core print cooperate through positioning boss, detent and pin, form core of flexible, connect through pin between each core assembly head; The other end of said core of flexible is equipped with the tail core print, and the socket cap of this tail core print is packed in the cylinder nest of slot core print and inserted block core print, connects through pin.
Described inserted block core print is joined by the outer surface of the circular sleeve of 2 different-diameters and combines, and is respectively socket cap and core print body; Socket cap and core print body center of circle spacing are about 1.5 times of core print body radius; Inserted block core print socket cap has positioning boss; The first end of cylinder is concordant with core print body end face, and the socket cap external diameter is slightly less than cylinder nest internal diameter, and it highly equals the half the of core print height degree; Core print body inboard has the cylinder nest the same with the plug fixture block, cooperates with the socket cap of next core assembly head through pin; The core print body diameter equals the gauge of plug, highly is 1/2 of plug width dimensions; The circle centre position of socket cap is drilled with cylinder pin hole, and it is a matched in clearance with cooperating of straight pin, is convenient to core print and rotates around straight pin; The upper end circular arc of core print confirms that principle is to intersect with next core print; And the lower end circular arc confirms that principle is that next core print is intersected with core print around 20 ° of socket cap center of circle rotations; So just guaranteed that next core print can rotate 20 ° relatively.
The quantity of described slot core print is identical with the quantity of inserted block core print; The slot core print is similar with inserted block core print shape; Insert lock pin head socket cap detent is arranged; Inserted block core print and slot core print cooperate through positioning boss and detent; The slot core print is connected through pin with the inserted block core print, forms one group of core of flexible.
Described tail core print core print body is identical with the respective outer diameters of slot core print with the socket cap external diameter; Core print height degree equals the width dimensions of plug, and the socket cap height is 1/2 of a core print height degree; The core print body cuts the formation end face in the center of circle to socket cap rightabout skew certain distance.
A surface of said mandrel body one end is a cascaded surface, at the middle part of this cascaded surface the mandrel body detent is arranged, and the both sides of mandrel body detent are the mandrel body positioning boss; On the mandrel body detent, dowel hole is arranged, the connecting hole of screw is arranged on the mandrel body positioning boss of mandrel body detent both sides; The socket cap of the inserted block core print in the cylinder nest of mandrel body end face and the core of flexible is connected through pin and matches.
Described plug fixture block has plug fixture block positioning boss, and the centre has dowel hole; Both sides are plug fixture block detent, in the plug fixture block detent screw hole are arranged, and make that the surface of plug fixture block is a cascaded surface, and this cascaded surface cooperate with the cascaded surface of mandrel body; The socket cap of the slot core print in the cylinder nest of plug fixture block end face and the core of flexible matches through pin.
The present invention is cooperatively interacted by the socket cap and the cylinder nest of a plurality of core prints, and can rotate between the two; The core print outside diameter equates with the height of plug, and core print is all identical with plug width and chamfering, and core print outer rim each point all can be matched with the rectangular tube inwall.Be connected with pin through socket cap, cylinder nest between each core print and between core print and the plug, can make things convenient for the increase and decrease of core print and the dismounting of plug like this.During use, flexible core is placed in the rectangular tube.When crooked rectangular tube, core print can freely rotate around pin, can accomplish rectangular tube minor radius bending forming according to designing requirement, to satisfy the requirement of rectangular tube bending forming curvature.
The present invention is in BENDING PROCESS, and core print can be around relatively 20 ° of rotations of pin, like this realize its flexible in, can realize effective support to the small-bend radius pipe.Adopt the present invention, can eliminate wrinkling effectively and drawing crack, and the cross section distortion of shaping rectangular pipe fittings is controlled in 1%, realize that minimum relative bending radius (R/H) is 2.46 the accurate bending forming of aluminium alloy thin-walled rectangular tube.This core compact conformation, each parts connect closely, and major part is changed convenient.
Description of drawings
Fig. 1 is the view of the crooked flexible core of rectangular tube in the pipe that is shaped,
Fig. 2 is the structural representation of flexible core
Fig. 3 is the core print sketch map
Fig. 4 is an inserted block core print sketch map
Fig. 5 is a slot core print sketch map,
Fig. 6 is a tail core print structural representation,
Fig. 7 is the mandrel body sketch map,
Fig. 8 is a plug fixture block sketch map,
Fig. 9 is the scheme of installation of the crooked flexible core of rectangular tube.Wherein:
1. rectangular tube 2. core prints 3. tail core prints 4. plugs 5. shop bolts 6. screwed holes 7. straight pins 8. slot core prints 9. inserted block core prints 10. mandrel bodies 11. plug fixture blocks 12. dowel holes 13. socket caps 14. positioning boss 15. detents 16. cylinder pin holes 17. cylinder nests 18. core print bodies 19. screw holes 20. screws 21. plug fixture block positioning boss 22. plug fixture block detents 23. mandrel body detents 24. mandrel body positioning boss
The specific embodiment
Present embodiment is that to be used for sectional dimension be 24.86mm * 12.2mm * 1mm, and radius of curvature R is 30mm, and angle of bend is 90 ° the crooked flexible core of aluminium alloy thin-walled rectangular tube numerical control, and its relative bending radius is 2.46.According to thin-walled rectangular tube sectional dimension and crooked specification, the width of confirming core is 22.66mm, and thickness is 9.96mm, and length is 150mm, and chamfering is 0.3mm; Core print quantity is 4.
Present embodiment comprises a mandrel body, a plug fixture block, three inserted block core prints, three slot core prints, a tail core print, a setting circle pin, four straight pins and two trip bolts.
A surface of mandrel body 10 1 ends is a cascaded surface, at the middle part of this cascaded surface mandrel body detent 23 is arranged, and dowel hole 12 is arranged on mandrel body detent 23; The both sides of mandrel body detent are mandrel body positioning boss 24; The connecting hole that screw 20 is arranged on the positioning boss 24.The cylinder nest of mandrel body 10 end faces cooperates with the socket cap of inserted block core print 9.
8 cooperations form core print 2 with the slot core print by inserted block core print 9.
Inserted block core print 9 has a plurality of, and concrete quantity is confirmed according to the relative anglec of rotation with core print of angle of bend of the rectangular tube of formed thereby.In the present embodiment, the inserted block core print has 3.The inserted block core print is combined by the circular sleeve of 2 different-diameters, and the cross section that makes said inserted block core print 9 is two annulus that outer surface joins, and is respectively socket cap 13 and core print body 18.Inserted block core print socket cap 13 has positioning boss 14, and its height and width are about 2-3mm.The first end of cylinder is concordant with core print body end face, and the socket cap external diameter is slightly less than cylinder nest internal diameter, and it highly equals the half the of core print height degree.Core print body inboard has the cylinder nest the same with the plug fixture block, cooperates with the socket cap of next core assembly head through pin.Core print body 18 external diameters equal the gauge of plug 4, highly are 1/2 of plug size.The circle centre position of socket cap 13 is drilled with cylinder pin hole 16, and it is a matched in clearance with cooperating of straight pin, is convenient to core print and rotates around straight pin.The upper end circular arc of core print confirms that principle is to intersect with next core print.And the lower end circular arc confirms that principle is that 20 ° of next core print rotations is crossing with core print.So just guaranteed that next core print can rotate 20 ° relatively.
The architectural feature of slot core print 8 is similar with the architectural feature of inserted block core print 9.Slot core print 8 has a plurality of, and quantity is identical with the quantity of inserted block core print 9.In the present embodiment, slot core print 8 has 3.Slot core print 8 is combined by the circular sleeve of 2 different-diameters, and the cross section that makes said slot core print 8 is the annulus that two outer surfaces intersect, and is respectively socket cap 13 and core print body 18.Slot core print socket cap 13 has detent 15, and its degree of depth and width are about 2-3mm, to cooperate with the inserted block core print.
Inserted block core print 9 and slot core print 8 are through positioning boss 14 and detent 15 and pin and 7 cooperate, and form a core assembly head 2.
Tail core print core print body 18 is identical with the respective outer diameters of slot core print with socket cap 13 external diameters.Core print body 18 highly equals the width dimensions of plug, and socket cap 13 highly is 1/2 of core print body 18 height.Core print body 18 cuts the formation end face in the center of circle to socket cap 13 rightabouts skew certain distance.The endoporus of socket cap 13 is a cylinder pin hole 16.
During assembling:
1) the first segment core print is installed.The socket cap 13 of tail core print 3 is packed in the cylinder nest 17 of a slot core print 8, buckle inserted block core print 9 then, keep tail core print socket cap pin-and-hole concentric with core print cylinder nest pin-and-hole; Get a pin 7, in the above-mentioned pin-and-hole of packing into, make the end face of core print concordant respectively with two end faces of tail core print.
2) according to said method all the other are installed after and respectively save core print.
3) plug is installed.The socket cap of core print is foremost packed in the cylinder nest 17 of mandrel body 10, buckle plug fixture block 11, keep the pin-and-hole of plug cylinder nest concentric with the pin-and-hole of core print socket cap foremost; To pin and 7 pack in the pin-and-hole; Get alignment pin and pack in the dowel hole of mandrel body and plug fixture block, and make the outer face of mandrel body, plug fixture block and core print concordant, two attachment screws of screwing on have at last promptly formed the crooked flexible core of rectangular tube.
Claims (6)
1. one kind is used for the crooked flexible core of thin-walled rectangular tube, it is characterized in that, comprises mandrel body, plug fixture block, inserted block core print, slot core print, tail core print; The plug fixture block is fixed on the cascaded surface of mandrel body one end, has formed plug; The cylinder nest of plug fixture block one end matches with the socket cap of slot core print, and the cylinder nest of mandrel body end face matches with the socket cap of inserted block core print; Inserted block core print and slot core print all have a plurality of; Inserted block core print and slot core print cooperate through positioning boss, detent and pin, form core of flexible, connect through pin between each core assembly head; The other end of said core of flexible is equipped with the tail core print, and the socket cap of this tail core print is packed in the cylinder nest of slot core print and inserted block core print, connects through pin.
2. a kind of according to claim 1 crooked flexible core of thin-walled rectangular tube that is used for is characterized in that, the inserted block core print is joined by the outer surface of the circular sleeve of 2 different-diameters and combines, and is respectively socket cap and core print body; Socket cap and core print body center of circle spacing are about 1.5 times of core print body radius; Inserted block core print socket cap has positioning boss; The first end of cylinder is concordant with core print body end face, and the socket cap external diameter is slightly less than cylinder nest internal diameter, and it highly equals the half the of core print height degree; Core print body inboard has the cylinder nest the same with the plug fixture block, cooperates with the socket cap of next core assembly head through pin; The core print body diameter equals the gauge of plug, highly is 1/2 of plug width dimensions; The circle centre position of socket cap is drilled with cylinder pin hole, and it is a matched in clearance with cooperating of straight pin, is convenient to core print and rotates around straight pin; The upper end circular arc of core print confirms that principle is to intersect with next core print; And the lower end circular arc confirms that principle is that next core print is intersected with core print around 20 ° of socket cap center of circle rotations; So just guaranteed that next core print can rotate 20 ° relatively.
3. a kind of according to claim 1 crooked flexible core of thin-walled rectangular tube that is used for is characterized in that the quantity of slot core print is identical with the quantity of inserted block core print; The slot core print is similar with inserted block core print shape; Insert lock pin head socket cap detent is arranged; Inserted block core print and slot core print cooperate through positioning boss and detent; The slot core print is connected through pin with the inserted block core print, forms one group of core of flexible.
4. a kind of according to claim 1 crooked flexible core of thin-walled rectangular tube that is used for is characterized in that tail core print core print body is identical with the respective outer diameters of slot core print with the socket cap external diameter; Core print height degree equals the width dimensions of plug, and the socket cap height is 1/2 of a core print height degree, and this socket cap is complete; The core print body cuts the formation end face in the center of circle to socket cap rightabout skew certain distance.
5. a kind of according to claim 1 crooked flexible core of thin-walled rectangular tube that is used for; It is characterized in that; A surface of said mandrel body one end is a cascaded surface, at the middle part of this cascaded surface the mandrel body detent is arranged, and the both sides of mandrel body detent are the mandrel body positioning boss; On the mandrel body detent, dowel hole is arranged, the connecting hole of screw is arranged on the mandrel body positioning boss of mandrel body detent both sides; The socket cap of the inserted block core print in the cylinder nest of mandrel body end face and the core of flexible is connected through pin and matches.
6. a kind of according to claim 1 crooked flexible core of thin-walled rectangular tube that is used for is characterized in that the plug fixture block has plug fixture block positioning boss, and the centre has dowel hole; Both sides are plug fixture block detent, in the plug fixture block detent screw hole are arranged, and make that the surface of plug fixture block is a cascaded surface, and this cascaded surface cooperate with the cascaded surface of mandrel body; The socket cap of the slot core print in the cylinder nest of plug fixture block end face and the core of flexible matches through pin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210044203.1A CN102581091B (en) | 2012-02-24 | 2012-02-24 | Flexible core mold for bending thin-wall rectangular tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210044203.1A CN102581091B (en) | 2012-02-24 | 2012-02-24 | Flexible core mold for bending thin-wall rectangular tube |
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| CN102581091A true CN102581091A (en) | 2012-07-18 |
| CN102581091B CN102581091B (en) | 2014-04-02 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103240311A (en) * | 2013-05-27 | 2013-08-14 | 倪慨宇 | Flexibility core rod for stretching hollow metal tube section bar to be bent |
| CN104056885A (en) * | 2013-03-22 | 2014-09-24 | 浙江炜驰机械集团有限公司 | Pipe forming device |
| CN104259278A (en) * | 2014-07-31 | 2015-01-07 | 西北工业大学 | Flexible forked core model for bending and forming of double-ridge rectangular tube |
| CN104462634A (en) * | 2014-09-24 | 2015-03-25 | 成都飞机工业（集团）有限责任公司 | Method for designing geometric sizes of spoon-shaped core rods for numerical control bend forming of small-caliber thick-wall tubes |
| CN104707884A (en) * | 2015-02-04 | 2015-06-17 | 西北工业大学 | Integral flexible core mold for rotary draw bending of thin-walled rectangular pipe |
| CN107350993A (en) * | 2017-08-24 | 2017-11-17 | 重庆望江工业有限公司 | A kind of equidistant surface inner-cavity structure part positioner |
| CN107520299A (en) * | 2017-09-12 | 2017-12-29 | 株洲博雅实业有限公司 | A kind of small curvature bending forming auxiliary machining device and assistance processing method |
| CN113210474A (en) * | 2021-05-11 | 2021-08-06 | 浙江大学 | Core ball connecting device for bending pipe fitting to inhibit core ball from shaking |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104056885A (en) * | 2013-03-22 | 2014-09-24 | 浙江炜驰机械集团有限公司 | Pipe forming device |
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| CN104259278A (en) * | 2014-07-31 | 2015-01-07 | 西北工业大学 | Flexible forked core model for bending and forming of double-ridge rectangular tube |
| CN104462634A (en) * | 2014-09-24 | 2015-03-25 | 成都飞机工业（集团）有限责任公司 | Method for designing geometric sizes of spoon-shaped core rods for numerical control bend forming of small-caliber thick-wall tubes |
| CN104707884A (en) * | 2015-02-04 | 2015-06-17 | 西北工业大学 | Integral flexible core mold for rotary draw bending of thin-walled rectangular pipe |
| CN107350993A (en) * | 2017-08-24 | 2017-11-17 | 重庆望江工业有限公司 | A kind of equidistant surface inner-cavity structure part positioner |
| CN107350993B (en) * | 2017-08-24 | 2023-10-27 | 重庆望江工业有限公司 | Equidistant curved surface inner cavity structural member positioning device |
| CN107520299A (en) * | 2017-09-12 | 2017-12-29 | 株洲博雅实业有限公司 | A kind of small curvature bending forming auxiliary machining device and assistance processing method |
| CN107520299B (en) * | 2017-09-12 | 2019-08-06 | 株洲博雅实业有限公司 | A kind of small curvature bending forming auxiliary machining device and assistance processing method |
| CN113210474A (en) * | 2021-05-11 | 2021-08-06 | 浙江大学 | Core ball connecting device for bending pipe fitting to inhibit core ball from shaking |
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| CN102581091B (en) | 2014-04-02 |
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Granted publication date: 20140402 Termination date: 20160224 |