CN102581091B - 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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- CN102581091B CN102581091B CN201210044203.1A CN201210044203A CN102581091B CN 102581091 B CN102581091 B CN 102581091B CN 201210044203 A CN201210044203 A CN 201210044203A CN 102581091 B CN102581091 B CN 102581091B
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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 a kind of flexible core mold for the bending of thin-walled rectangular tube minor radius.
Background technology
For the ratio of the thickness of tube wall and the width of pipe, be less than 1/15 rectangular tube and be called thin-walled rectangular tube.Aluminium alloy thin-walled rectangular tube bool is lightweight owing to having, vibration absorption ability is strong, bandwidth and the advantage such as loss of signal is little, is widely used in the fields such as radar, ground satellite station and microwave measurement.Yet due to thin-walled rectangular tube hollow, thin-walled, in its BENDING PROCESS, very easily produce the defects such as wrinkling, cross section distortion and drawing crack, have a strong impact on its forming accuracy.Core can effectively prevent the generation of above-mentioned defect.Yet and trend development that bending radius less larger along with the oriented wall thickness factor of bent pipe parts and compact conformation and spatial complication improve constantly the requirement of elbow member inner surface quality, and existing core is difficult to meet the demands.Therefore be necessary to develop the crooked flexible core mold of a kind of thin-walled rectangular tube minor radius, to meet the requirement of modern industry to elbow member.
In bending thin-wall rectangular tube process, conventional hydraulic pressure, the grains of sand, steel core core etc. are filled as core at present.Hydraulic pressure filler is easily attached on inner surface of pipe fitting, affects its internal accuracy.Grains of sand filler easily scratches inner surface, and is difficult to abundant filling.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 mold structure are simple, and its underpart is straight, and rectangular tube inner side is not almost had to supporting role, can not effectively eliminate wrinkling and be easy to cause pipe fitting to break, and can not adapt to thin-walled rectangular tube minor radius crooked.The filling of steel band and taking-up are relatively wasted time and energy, and use inconvenience, and easily scratch inner surface of pipe fitting.Chain type core mold structure is compact not, flexible.For the circular pipe fitting rotary draw bending of thin-walled, have at present spherical flexible core in addition, it is mainly applicable to thin-wall circular tube.And its core print is an integral body, in BENDING PROCESS, easily occur that core print rotates inharmonic phenomenon.Because rectangular tube has the existence of rib muscle, so that rectangular tube material flows is inhomogeneous, and be not easy fully to be filled.Therefore use current core, the rectangular pipe fittings bending to be prone to the defects 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 not, flexible in order to overcome existing thin-walled rectangular tube minor radius snake core mould structure, the defect that relative bending radius is not little, the present invention proposes a kind of flexible core mold for bending thin-wall rectangular tube.
The present invention includes mandrel body, plug fixture block, inserted block core print, slot core print, tail core print; 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 coordinate by positioning boss, detent and pin, form core of flexible, between each core assembly head, by pin, connect; The other end of described core of flexible is provided with tail core print, and the socket cap of this tail core print packs in the cylinder nest of slot core print and inserted block core print, by pin, connects.
Described inserted block core print is joined and is combined by the outer surface of the circular sleeve of 2 different-diameters, 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; Socket cap one end is concordant with core print body end face, and socket cap external diameter is slightly less than cylinder nest internal diameter, and it highly equals core print height half; Core print body inner side has the cylinder nest the same with plug fixture block, by pin, coordinates with the socket cap of next core assembly head; Core print body diameter equals the gauge of plug, is highly 1/2 of plug width dimensions; The circle centre position of socket cap is drilled with cylinder pin hole, and it is matched in clearance with coordinating of straight pin, is convenient to core print and rotates around straight pin; The upper end circular arc of core print determines that principle is to intersect with next core print; And lower end circular arc determines 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 is relative to rotating 20 °.
The quantity of described slot core print is identical with the quantity of inserted block core print; Slot core print is similar with inserted block core print shape; Insert lock pin head socket cap and have detent; Inserted block core print and slot core print coordinate by positioning boss and detent; Slot core print is connected by pin with 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 socket cap external diameter; Core print height equals the width dimensions of plug, and socket cap height is 1/2 of core print height; Core print body cuts and forms end face to socket cap rightabout skew certain distance in the center of circle.
A surface of described mandrel body one end is cascaded surface, at the middle part of this cascaded surface, has mandrel body detent, and the both sides of mandrel body detent are mandrel body positioning boss; On mandrel body detent, there is dowel hole, on the mandrel body positioning boss of mandrel body detent both sides, have the connecting hole of screw; The cylinder nest of mandrel body end face is connected and is matched by pin with the socket cap of the inserted block core print in core of flexible.
Described plug fixture block has plug fixture block positioning boss, and centre has dowel hole; Both sides are plug fixture block detent, in plug fixture block detent, have screw hole, and the surface that makes plug fixture block is cascaded surface, and this cascaded surface coordinates with the cascaded surface of mandrel body; The cylinder nest of plug fixture block end face matches by pin with the socket cap of the slot core print in core of flexible.
The present invention is cooperatively interacted by socket cap and the cylinder nest of a plurality of core prints, and can rotate between the two; 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 rectangular tube inwall.Between each core print and between core print and plug, by socket cap, cylinder nest, be connected with pin, can facilitate like this increase and decrease of core print and the dismounting of plug.During use, flexible core mold is placed in rectangular tube.When Bending Rectangular pipe, core print can freely rotate around pin, can complete rectangular tube minor radius bending forming according to designing requirement, to meet 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 the effective support to small-bend radius pipe.Adopt the present invention, can effectively eliminate wrinkle and fracture, and the cross section distortion of shaping rectangular pipe fittings is controlled in 1%, realize the accurate bending forming of aluminium alloy thin-walled rectangular tube that minimum relative bending radius (R/H) is 2.46.This core mold structure is compact, and each parts connect closely, and major part is changed convenient.
Accompanying drawing explanation
Fig. 1 is the view of the crooked flexible core mold of rectangular tube in the pipe that is shaped,
Fig. 2 is the structural representation of flexible core mold
Fig. 3 is core print schematic diagram
Fig. 4 is inserted block core print schematic diagram
Fig. 5 is slot core print schematic diagram,
Fig. 6 is tail core head structure schematic diagram,
Fig. 7 is mandrel body schematic diagram,
Fig. 8 is plug fixture block schematic diagram,
Fig. 9 is the scheme of installation of the crooked flexible core mold of rectangular tube.Wherein:
1. rectangular tube 2. core print 3. tail core print 4. plug 5. shop bolt 6. screwed hole 7. straight pin 8. slot core print 9. inserted block core print 10. mandrel body 11. plug fixture block 12. dowel hole 13. socket cap 14. positioning boss 15. detent 16. cylinder pin hole 17. cylinder nest 18. core print body 19. screw hole 20. screw 21. plug fixture block positioning boss 22. plug fixture block detent 23. mandrel body detent 24. mandrel body positioning boss
The specific embodiment
The present embodiment is to be 24.86mm * 12.2mm * 1mm for sectional dimension, and radius of curvature R is 30mm, and angle of bend is the flexible core mold of the aluminium alloy thin-walled rectangular tube numerical-control bending of 90 °, and its relative bending radius is 2.46.According to thin-walled rectangular tube sectional dimension and crooked specification, the width of determining core is 22.66mm, and thickness is 9.96mm, and length is 150mm, and chamfering is 0.3mm; Core print quantity is 4.
The 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 one end is cascaded surface, at the middle part of this cascaded surface, has mandrel body detent 23, has dowel hole 12 on mandrel body detent 23; The both sides of mandrel body detent are mandrel body positioning boss 24; The connecting hole that has screw 20 on positioning boss 24.The cylinder nest of mandrel body 10 end faces coordinates with the socket cap of inserted block core print 9.
Core print 2 is coordinated and is formed by inserted block core print 9 and slot core print 8.
Inserted block core print 9 has a plurality of, and concrete quantity is determined according to the angle of bend of the rectangular tube of the formed thereby anglec of rotation relative to core print.In the present embodiment, inserted block core print has 3.Inserted block core print is combined by the circular sleeve of 2 different-diameters, and the cross section that makes described 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.Socket cap one end is concordant with core print body end face, and socket cap external diameter is slightly less than cylinder nest internal diameter, and it highly equals core print height half.Core print body inner side has the cylinder nest the same with plug fixture block, by pin, coordinates with the socket cap of next core assembly head.Core print body 18 external diameters equal the gauge of plug 4, are highly 1/2 of plug size.The circle centre position of socket cap 13 is drilled with cylinder pin hole 16, and it is matched in clearance with coordinating of straight pin, is convenient to core print and rotates around straight pin.The upper end circular arc of core print determines that principle is to intersect with next core print.And lower end circular arc determines that principle is that 20 ° of next core print rotations are intersected with core print.So just guaranteed that next core print is relative to rotating 20 °.
The architectural feature of slot core print 8 is similar to 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 described slot core print 8 is two annulus that outer surface is crossing, 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 coordinate with inserted block core print.
Inserted block core print 9 and slot core print 8 coordinate by positioning boss 14 and detent 15 and pin 7, 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 is highly 1/2 of core print body 18 height.Core print body 18 cuts and forms end face to socket cap 13 rightabout skew certain distances in the center of circle.The endoporus of socket cap 13 is cylinder pin hole 16.
During assembling:
1) first segment core print is installed.The socket cap of tail core print 3 13 is packed in the cylinder nest 17 of a slot core print 8, then buckle inserted block core print 9, keep tail core print socket cap pin-and-hole concentric with core print cylinder nest pin-and-hole; Get a pin 7, pack in above-mentioned pin-and-hole, make the end face of core print and two end faces of tail core print concordant respectively.
2) after, according to said method, all the other are installed 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; Pin 7 is packed in pin-and-hole; Get in the dowel hole that alignment pin packs mandrel body and plug fixture block into, and make the outer face of mandrel body, plug fixture block and core print concordant, two attachment screws of finally screwing on, have formed the crooked flexible core mold of rectangular tube.
Claims (5)
1. for a flexible core mold for bending thin-wall rectangular tube, it is characterized in that, comprise mandrel body, plug fixture block, inserted block core print, slot core print, tail core print; 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 coordinate by positioning boss, detent and pin, form core of flexible, between each core assembly head, by pin, connect; The other end of described core of flexible is provided with tail core print, and the socket cap of this tail core print packs in the cylinder nest of slot core print and inserted block core print, by pin, connects; Described inserted block core print is joined and is combined by the outer surface of the circular sleeve of 2 different-diameters, is respectively socket cap and core print body; Socket cap and core print body center of circle spacing are 1.5 times of core print body radius; Inserted block core print socket cap has positioning boss; Socket cap one end is concordant with core print body end face, and socket cap external diameter is slightly less than cylinder nest internal diameter, and it highly equals core print height half; Core print body inner side has the cylinder nest the same with plug fixture block, by pin, coordinates with the socket cap of next core assembly head; Core print body diameter equals the gauge of plug, is highly 1/2 of plug width dimensions; The circle centre position of socket cap is drilled with pin pin-and-hole, and it is matched in clearance with coordinating of pin, is convenient to core print around this pin rotation; The upper end circular arc of core print determines that principle is to intersect with next core print; And lower end circular arc determines 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 is relative to rotating 20 °.
2. a kind of flexible core mold for bending thin-wall rectangular tube as claimed in claim 1, is characterized in that, the quantity of slot core print is identical with the quantity of inserted block core print; Slot core print is similar with inserted block core print shape; Slot core print socket cap has detent; Inserted block core print and slot core print coordinate by positioning boss and detent; Slot core print is connected by pin with inserted block core print, forms one group of core of flexible.
3. a kind of flexible core mold for bending thin-wall rectangular tube as claimed in claim 1, is characterized in that, tail core print core print body is identical with the respective outer diameters of slot core print with socket cap external diameter; Core print height equals the width dimensions of plug, and socket cap height is 1/2 of core print height, and this socket cap is complete; Core print body cuts and forms end face to socket cap rightabout skew certain distance in the center of circle.
4. a kind of flexible core mold for bending thin-wall rectangular tube as claimed in claim 1, it is characterized in that, a surface of described mandrel body one end is cascaded surface, at the middle part of this cascaded surface, has mandrel body detent, and the both sides of mandrel body detent are mandrel body positioning boss; On mandrel body detent, there is dowel hole, on the mandrel body positioning boss of mandrel body detent both sides, have the connecting hole of screw; The cylinder nest of mandrel body end face is connected and is matched by pin with the socket cap of the inserted block core print in core of flexible.
5. a kind of flexible core mold for bending thin-wall rectangular tube as claimed in claim 1, is characterized in that, plug fixture block has plug fixture block positioning boss, and centre has dowel hole; Both sides are plug fixture block detent, in plug fixture block detent, have screw hole, and the surface that makes plug fixture block is cascaded surface, and this cascaded surface coordinates with the cascaded surface of mandrel body; The cylinder nest of plug fixture block end face matches by pin with the socket cap of the slot core print in core of flexible.
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| 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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| 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 CN102581091A (en) | 2012-07-18 |
| CN102581091B true CN102581091B (en) | 2014-04-02 |
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Families Citing this family (8)
| 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 |
| CN103240311B (en) * | 2013-05-27 | 2015-06-17 | 倪慨宇 | Flexibility core rod for stretching hollow metal tube section bar to be bent |
| 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 |
| CN104707884B (en) * | 2015-02-04 | 2018-03-09 | 西北工业大学 | A kind of monoblock type flexible core mold for thin-walled rectangular tube rotary draw bending |
| 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 |
| 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 |
| CN113210474B (en) * | 2021-05-11 | 2022-05-17 | 浙江大学 | Core ball connecting device for bending pipe fitting to inhibit core ball from shaking |
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| JPS541470Y2 (en) * | 1975-06-03 | 1979-01-23 |
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