CN109773019B - EGR shell oral area hole-crimped forming technique - Google Patents
EGR shell oral area hole-crimped forming technique Download PDFInfo
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- CN109773019B CN109773019B CN201811587034.XA CN201811587034A CN109773019B CN 109773019 B CN109773019 B CN 109773019B CN 201811587034 A CN201811587034 A CN 201811587034A CN 109773019 B CN109773019 B CN 109773019B
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Abstract
The present invention provides a kind of EGR shell oral area hole-crimped forming technique, and step includes: that (1) utilizes the obtained preforming shell of EGR of Tube Hydroforming technique；(2) the benchmark bottom outlet of flange is made at the end to be processed of preforming shell using punching die, and hole flanging is carried out to benchmark bottom outlet, obtain preforming flange；(3) high frequency annealing processing is carried out to preforming flange, after preforming flange shaping is tentatively obtained to the straight-arm caliber size precision of flange；(4) inner wall of step (3) treated preforming flange roll and be allowed to be plastically deformed, until flange straight-arm size reaches design accuracy.The present invention uses hydraulic expanding-forming first, punching, hole flanging, annealing, shaping, the processes such as rolls and be integrally formed high-precision flange on EGR shell, be conducive to produce large-scale EGR shell high-precision flange ring, machining and the welding deformation that single part can be reduced, reduce the processing cost of such product.
Description
Technical field
The present invention relates to the processing technologies of auto parts and components, more particularly, to the moulding process of EGR shell oral area flange ring.
Background technique
Egr system (gas recirculation system) is a kind of for reducing the technology of nitrogen oxides and side in motor vehicle exhaust emission
Method reaches the product that Europe IV, V standard must use for motor vehicle exhaust emission.The principle and effect of cooler: automobile is burned
Cheng Zhong will generate 500~600 ° or so of high temperature, could flow back after need to cooling down to exhaust gas, emission effect is otherwise not achieved, this
A process is then completed in cooler for recycled exhaust gas.If not cooled down to EGR gas, hot recirculating exhaust gas will heat air inlet, lead
Engine in-cylinder combustion temperature and pressure is caused significantly to increase, counteracting EGR reduces the effect of NOx, will also be to starting when serious
The structure of machine body generates destruction.
General cooler for recycled exhaust gas includes hollow shell, and one end of the shell is provided with air inlet end cap, and the other end of shell is set
It is equipped with outlet end cap, water inlet pipe and outlet pipe are provided on housing exterior walls, is provided with inlet flange at the air inlet of air inlet end cap,
It is provided with outlet flange at the gas outlet of outlet end cap, cooler for recycled exhaust gas is connected to engine by inlet flange and outlet flange
At exhaust gas discharge.Flange on existing large size EGR shell can not use hydro-forming, can only use split type, i.e., single flange
It is integrated again with case weld using after machining, processing cost is high, and the production cycle is long.
Summary of the invention
In order to solve the above technical problems, the present invention provides a kind of processing technology of shaped flange ring directly on EGR shell.
The technical solution of the present invention is to provide a kind of EGR shell oral area hole-crimped forming technique, step includes:
(1) the preforming shell of EGR is made using Tube Hydroforming technique；
(2) using punching die preforming shell end to be processed be made flange benchmark bottom outlet, and to benchmark bottom outlet into
Row hole flanging obtains preforming flange；
(3) high frequency annealing processing is carried out to preforming flange, after preforming flange shaping is made at the straight-arm 2/3 of flange mouthful
Diameter dimensional accuracy is ± 0.2mm；
(4) inner wall of step (3) treated preforming flange roll and be allowed to be plastically deformed, until flange
Straight-arm size reaches the precision of ± 0.1mm.
Wherein, the punching die in step (2) includes mutually matched first cope plate, the first lower template and binder
The end to be processed of plate I, formed punch, die plate insert, preforming shell is placed between the first cope plate and the first lower template, pressure plate I
Fixed end to be processed, die plate insert are padded on the inside at end to be processed, and formed punch downlink cooperates with die plate insert to be formed at end to be processed
Benchmark bottom outlet；
Hole flanging mold includes mutually matched second cope plate and the second lower template in step (2), mutually matched to turn over
Hole punch-pin and hole flanging cavity plate, pressure plate II, Burring Punch be pierced by out of end to be processed benchmark bottom outlet insertion hole flanging cavity plate in from
And complete the hole flanging to benchmark bottom outlet；
Step (3) medium-high frequency annealing parameter is 1050 DEG C of annealing temperature, annealing time 8s-10s；
Shaping mold includes third cope plate and third lower template in step (3), and it is convex that third cope plate is provided with shaping
Mould, limit plate, third lower template are provided with the second limited post for limiting end position to be processed, third cope plate and third lower template
Between be additionally provided with the plug I for supporting end to be processed, plug I is fixed on third cope plate and third lower template by vertical plate；Limit
There is position plate a through-hole to pass through for shaping terrace die, and the inner side wall of through hole and shaping terrace die lateral wall of limit plate can squeeze flange
Straight-arm to being adjusted to the precision of flange straight-arm；
Being rolled in step (4) with mold includes pressing plate, and be set to pressing plate rolls portion, supports the plug II at end to be processed,
The portion of rolling, which can protrude into flange, to roll flange straight-arm inner sidewall to obtain flange straight-arm dimensional accuracy as ± 0.1mm.
Further, punching die further includes the punch fixing plate for fixing formed punch, and the cavity plate of fixed die plate insert is solid
Fixed board, and the tray of the preforming shell of positioning.
Further, hydraulic expanding die includes mutually matched upper model cavity and drag chamber in above-mentioned steps (1), to
Workpiece is placed between model cavity and drag chamber, and plug is placed in workpiece both-side opening to be added end and closing open end, is passed through
Plug is filled with liquid to type chamber, makes the intracavitary formation 180-200MPa pressure of type, and 2~5s of pressure maintaining.
Further, it is additionally provided with elastic component between limit plate and third cope plate, makes limit plate for providing elastic force
It is tight to side pressure to be processed, it is preferable that elastic component can be spring, elastic slice, elastic polyester block etc..
Further, the portion of rolling includes stator, the roller for being set to stator periphery, and roller is in contact with flange straight-arm, rolling
Son is fixed on stator by roller fixed column.
Further, rolling with mold further includes pedestal and plug fixed plate, and plug II is fixed on by plug fixed plate
On pedestal.
The advantages of the present invention: the present invention uses the preforming shell of bulging process acquisition EGR first, then
Preforming flange is formed by punching, hole flanging process, then annealed, shaping, the processes such as rolls the dimensional accuracy of flange is carried out
Adjustment, finally obtains the satisfactory integrated molding flange of dimensional accuracy.Be conducive to produce large-scale EGR shell high-precision flange
Ring can reduce machining and the welding deformation of single part, reduce the processing cost of such product.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of present invention EGR shell to be processed.
Fig. 2 is the partial structural diagram at Fig. 1 EGR shell flange end to be processed.
Fig. 3 is the structural schematic diagram at another visual angle at the end to be processed Fig. 2.
Fig. 4 is the structural schematic diagram of hydraulic expanding die in the present invention.
Fig. 5 is the structural schematic diagram of punching die in the present invention.
Fig. 6 is the structural schematic diagram of hole flanging mold in the present invention.
Fig. 7 is the structural schematic diagram of shaping mold in the present invention.
Fig. 8 is the structural schematic diagram rolled in the present invention with mold.
In figure, the first oil cylinder of 11-, the second oil cylinder of 12-, the first plug of 13-, the second plug of 14-, the upper model cavity of 15-, 16-
Drag chamber, 17,18- platform of machine tool, the first cope plate of 21-, the first lower template of 22-, 23- formed punch, 24- punch fixing plate, 25-
Pressure plate I, 26- die plate insert, 27- die block, 28- tray, the second cope plate of 31-, the second lower template of 32-, 33- hole flanging
Punch-pin, 34- hole flanging cavity plate, 35- punch retainer, 36- pressure plate II, 37- fixed plate, 38- vertical plate, the first limited post of 39-,
41- third cope plate, 42- vertical plate, the second limited post of 43- plug I, 441-, 442- limit plate, 45- third lower template, 46- support
Plate, 47- flange arrangement, 48- shaping terrace die, 49- elastic component, 51- flange straight-arm, 52- roller, 53- roller fixed column, 54- are fixed
Son, 55- pressing plate, 56- plug II, 57- plug fixed plate, 58- pedestal, 6- workpiece to be added
Specific embodiment
The invention will be further described With reference to embodiment.
In the description of the present invention, it is to be understood that, term " center ", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outside", " up time
The orientation or positional relationship of the instructions such as needle ", " counterclockwise ", " axial direction ", " radial direction ", " circumferential direction ", is merely for convenience of describing this hair
Bright and simplified description, rather than the device or element of indication or suggestion meaning must have a particular orientation, with specific orientation
Construction and operation, therefore be not considered as limiting the invention.
In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include at least one this feature.In the description of the present invention, the meaning of " plurality " is at least two, such as two, three
It is a etc., unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can be mechanical connect
It connects, is also possible to be electrically connected；It can be directly connected, can also can be in two elements indirectly connected through an intermediary
The interaction relationship of the connection in portion or two elements, unless otherwise restricted clearly.For those of ordinary skill in the art
For, the specific meanings of the above terms in the present invention can be understood according to specific conditions.
In the present invention unless specifically defined or limited otherwise, fisrt feature in the second feature " on " or " down " can be with
It is that the first and second features directly contact or the first and second features pass through intermediary mediate contact.Moreover, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature be directly above or diagonally above the second feature, or be merely representative of
First feature horizontal height is higher than second feature.Fisrt feature can be under the second feature " below ", " below " and " below "
One feature is directly under or diagonally below the second feature, or is merely representative of first feature horizontal height less than second feature.
The present invention provides a kind of EGR shell oral area hole-crimped forming technique, is as shown in Figures 1 to 3 the flange of formation to be processed
Schematic diagram, processing step include:
(1) the preforming shell of EGR is made using Tube Hydroforming technique；
(2) the benchmark bottom outlet of flange is made at the end to be processed of preforming shell (workpiece 6 i.e. to be added) using punching die,
And hole flanging is carried out to benchmark bottom outlet, obtain preforming flange；
(3) high frequency annealing processing is carried out to preforming flange, after preforming flange shaping is made at the straight-arm 2/3 of flange mouthful
Diameter dimensional accuracy is ± 0.2mm；
(4) inner wall of step (3) treated preforming flange roll and be allowed to be plastically deformed, until flange
Straight-arm size reaches the precision of ± 0.1mm.
Wherein, the punching die in step (2), as shown in figure 5, including under mutually matched first cope plate 21, first
The end to be processed of template 22 and pressure plate I 25, formed punch 23, die plate insert 26, preforming shell (workpiece 6 i.e. to be added) is placed in
Between first cope plate 21 and the first lower template 22, pressure plate I 25 is fixed end to be processed, and die plate insert 26 is padded on to be added
The inside at work end, the recess of die plate insert 26 are substantially aligned at the flange setting at end to be processed, pass through punching operation, that is, formed punch
23 driving mechanism (such as hydraulic pump etc.) driving under downlink act on end to be processed, so that the material at end to be processed is entered female die embedding
Block 26 is to form benchmark bottom outlet；
As a further improvement, above-mentioned punching die further includes the punch fixing plate 24 for fixing formed punch 23, anchor
The die block 27 of mould insert 26, and the tray 28 of the preforming shell (workpiece 6 i.e. to be added) of positioning, tray 28 are fixed on the
In one lower template 22, tray 28 can adjust the position for limiting preforming shell (workpiece 6 i.e. to be added), benchmark bottom easy to process
Hole site is accurate；
Hole flanging mold in step (2), as shown in fig. 6, including mutually matched second cope plate 31 and the second lower template
32, mutually matched Burring Punch 33 and hole flanging cavity plate 34, pressure plate II 36；When hole flanging is processed, Burring Punch 33 is located to be added
Inside work end, hole flanging cavity plate 34 is located at outside end to be processed, and then Burring Punch 33 is pierced by out of end to be processed benchmark bottom outlet
The hole flanging completed to benchmark bottom outlet is inserted into hole flanging cavity plate 34, and the hole wall routed up forms flange straight-arm；
As a further improvement, Burring Punch 33 is fixed on punch retainer 35, punch retainer 35 is solid by vertical plate 38
Due in the second lower template 32, fixed plate 37 is additionally provided with to further fix punch retainer 35 and vertical plate 38, is made whole
Body is more preferable, and structure is firmer；One end of second cope plate 31 is additionally provided with the first limited post 39, turns over when limiting installation mold
The height of hole cavity plate 34, so that Burring Punch 33 has enough strokes；It is arranged between punch retainer 35 and pressure plate II 36
There is spring, punch retainer 35 and pressure plate II 36 are protruded into simultaneously inside end to be processed, under the action of the spring punch retainer 35
It struts with pressure plate II 36 to realize and support and fix to end to be processed, while hole flanging cavity plate 34 is pressed on outside end to be processed,
Inside and outside fixed support can guarantee that processing is accurate and when preventing hole flanging end to be processed other position distortions.
Step (3) medium-high frequency annealing parameter is 1050 DEG C of annealing temperature, annealing time 8s-10s；Make method by annealing
Blue ring local softening is reduced material rebounds, is increased the plasticity of material, be conducive to subsequent carry out precision with releasable material internal stress
Working process；
Shaping mold in step (3), as shown in fig. 7, comprises third cope plate 41 and third lower template 45, third upper mold
Plate 41 is provided with shaping terrace die 48, limit plate 442, and third lower template 45 is provided with the second limited post for limiting end position to be processed
441, the plug I 43 for supporting end to be processed is additionally provided between third cope plate 41 and third lower template 45, plug I 43 passes through
Vertical plate 42 is fixed between third cope plate 41 and third lower template 45；Limit plate 442 has a through-hole for shaping terrace die 48
It passes through, the inner side wall of through hole and 442 lateral wall of shaping terrace die of limit plate 442 can squeeze the straight-arm of flange to flange straight-arm
Precision be adjusted；
As a further improvement, elastic component 49 is additionally provided between limit plate 442 and third cope plate 41, for providing bullet
Property power keep limit plate 442 tight to side pressure to be processed, it is preferable that elastic component 49 can be spring, elastic slice, elastic polyester block etc., this
Elastic component 49 is elastic polyurethane block in embodiment；Supporting plate 46 is additionally provided in third lower template 45 for limiting workpiece 6 to be added
Due to place to be processed；Flange arrangement 47 is the flange of preliminarily forming, then carries out precision processing to flange；
Rolled in step (4) with mold, as shown in figure 8, include pressing plate 55, be set to the portion that rolls of pressing plate 55, support to
The plug II 56 at end is processed, the portion of rolling, which can protrude into flange, to roll flange inner sidewall to obtain flange straight-arm size essence
Degree is ± 0.1mm；
As a further improvement, the portion of rolling includes stator 54, the roller 52 for being set to 54 periphery of stator, roller 52 and flange
Straight-arm 51 is in contact, and roller 52 is fixed on stator 54 by roller fixed column 53.
As a further improvement, rolling with mold further includes pedestal 58 and plug fixed plate 57, plug II 56 passes through plug
Fixed plate 57 is fixed on pedestal 58.
As a further improvement, hydraulic expanding die in above-mentioned steps (1), as shown in figure 4, including mutually matched upper mold
Type chamber 15 and drag chamber 16, upper model cavity 15, drag chamber 16 are individually fixed in lathe 17,18, and workpiece to be added is placed in upper mold
Between type chamber 15 and drag chamber 16, the first plug 13, the second plug 14 are respectively placed in workpiece both-side opening to be added end and pass through
First oil cylinder 11 and the second oil cylinder 12 drive closing open end, are filled with liquid to type chamber by plug, make the intracavitary formation 180- of type
200MPa pressure, and 2~5s of pressure maintaining.
Specific work process are as follows:
Workpiece 6 to be added is placed between the upper model cavity 15 of hydraulic expanding die and drag chamber 16, upper and lower model cavity closes
After conjunction, the first oil cylinder 11 drives the first plug 13, the second oil cylinder 12 to drive the movement of the second plug 14 that the both ends of workpiece 6 to be added are close
Envelope is filled with liquid (can choose water) until being full of type chamber and reaching pressure via lateral type in the first, second plug is intracavitary
180-200MPa, pressure maintaining 3s make workpiece 6 to be added form the preforming shell for having body shape by hydraulic expanding-forming；
Preforming shell is placed in punching die, wherein flange end to be processed is placed in the first cope plate 21 and the first lower template
Between 22, pressure plate I 25 and the mutual cooperation of tray 28 make preforming shell accurately be placed in machining position, and pressure plate I 25 passes through pressure
Machining position is fixed in end to be processed by clamp force；Die plate insert 26 is padded on the inside of end to be processed, and recess be substantially aligned with flange at
At type position, formed punch downlink acts on end to be processed, and the material at end to be processed is made to enter die plate insert 26 to form benchmark bottom
Hole；
Hole flanging is carried out to benchmark bottom orifice and obtains flange basic configuration, specially Burring Punch 33 is located in end to be processed
Portion, hole flanging cavity plate 34 are located at outside end to be processed, while punch retainer 35 and pressure plate II 36 are protruded into simultaneously in end to be processed
Portion simultaneously realizes that support is fixed to end to be processed after strutting, and then Burring Punch 33 is pierced by insertion out of end to be processed benchmark bottom outlet
The hole flanging to benchmark bottom outlet is completed in hole flanging cavity plate 34, the hole wall routed up forms flange straight-arm, so far obtains preforming
Flange；
High frequency annealing processing is carried out to preforming flange, annealing temperature is 1050 DEG C, annealing time 8s-10s；Pass through annealing
Processing makes flange ring local softening, with releasable material internal stress, reduces material rebounds, increases the plasticity of material, be conducive to subsequent
Carry out precision working process
Workpiece 6 to be added is placed in shaping mould, shaping is carried out to preforming flange, end to be processed passes through limit plate 442, the
Two limited posts 441, plug I 43, supporting plate 46 are positioned at machining position, then 41 downlink of third cope plate, and 442 inner hole of limit plate is first
It on the outside of engagement flange straight-arm, continues traveling downwardly, shaping terrace die 48 and 442 inner hole of limit plate form flange straight-arm and squeeze, and make to do in the proper way
The dimensional accuracy of blue straight-arm sections inner side bore provides guarantee to ± 0.2mm, for subsequent precision arrival ± 0.1m；
Finally flange straight-arm inside is continued to roll processing, improve precision, workpiece 6 to be added is fixed by pressing plate 55
Mold is used in rolling, the portion of rolling uses cylindrical roller structure, and spiral rolling compaction flange straight-arm inside makes inner sidewall reach modeling
Property deformation, obtain flange straight-arm size reach ± 0.1mm precision；Specially pedestal 58 is fixed on numerically-controlled machine tool, it is to be processed
Part 6 is put into mold, after pressing plate 55 compresses workpiece 6 to be added, will be rolled portion mechanism and is fixed on numerically-controlled machine tool knife handle, stator 54 with
Numerically-controlled machine tool knife handle is fixed, and knife handle moves in a circle, and roller 52 and flange straight-arm medial surface generate rolling friction, to machined part
6 flange straight-arm inner sidewall carries out moulding, obtains flange straight-arm inner sidewall the required accuracy size.
The present embodiments relate to the material arrived, reagent and experimental facilities, are to meet zero, automobile unless otherwise instructed
The commercial product of part manufacture field.
The above is merely a preferred embodiment of the present invention, it is noted that for those skilled in the art
For, under the premise of not departing from core of the invention technology, improvements and modifications can also be made, these improvements and modifications are also answered
Belong to scope of patent protection of the invention.With any change in the comparable meaning and scope of claims of the present invention, all
It is considered as being included within the scope of the claims.
Claims (8)
1.EGR shell oral area hole-crimped forming technique, which is characterized in that step includes:
(1) the preforming shell of EGR is made using Tube Hydroforming technique；
(2) the benchmark bottom outlet of flange is made at preforming shell end to be processed using punching die, and benchmark bottom outlet is turned over
Hole obtains preforming flange；
(3) high frequency annealing processing is carried out to preforming flange, after preforming flange shaping is tentatively obtained to the straight-arm bore of flange
Dimensional accuracy；
(4) inner wall of step (3) treated preforming flange roll and be allowed to be plastically deformed, until flange straight-arm
Size reaches design accuracy；
Wherein, the punching die in the step (2) includes mutually matched first cope plate, the first lower template and binder
Plate I, formed punch, die plate insert；The end to be processed of preforming shell is placed between first cope plate and the first lower template, described
The fixed end to be processed pressure plate I, the die plate insert are padded on the inside at end to be processed, and the formed punch downlink and die plate insert cooperate
Benchmark bottom outlet is formed at end to be processed；
Hole flanging mold includes mutually matched second cope plate and the second lower template in the step (2), mutually matched to turn over
Hole punch-pin and hole flanging cavity plate, pressure plate II；The Burring Punch is pierced by insertion hole flanging cavity plate out of end to be processed benchmark bottom outlet
It is interior to complete to the hole flanging of benchmark bottom outlet；
Step (3) the medium-high frequency annealing parameter is 1050 DEG C of annealing temperature, annealing time 8s-10s；
Shaping mold includes third cope plate and third lower template in the step (3), and the third cope plate is provided with whole
Shape punch-pin, limit plate, the third lower template are provided with the second limited post for limiting end position to be processed, the third cope plate
It is additionally provided between third lower template and the plug I, the plug I at end to be processed is supported to be fixed on third cope plate by vertical plate
Between third lower template；There is the limit plate through-hole to pass through for the shaping terrace die, and squeeze to flange straight-arm
Pressure；
Rolling in the step (4) with mold includes pressing plate, and be set to the pressing plate rolls portion, supports the plug at end to be processed
II；The portion of rolling includes stator, the roller for being set to stator periphery, and the roller is in contact with flange straight-arm, the roller
The stator is fixed on by roller fixed column；The portion of rolling can protrude into flange and roll to flange straight-arm inner sidewall.
2. EGR shell oral area hole-crimped forming technique according to claim 1, which is characterized in that the punching die also wraps
Include the punch fixing plate for fixing the formed punch, the die block of the fixed die plate insert, and the preforming shell of positioning
The tray of body.
3. EGR shell oral area hole-crimped forming technique according to claim 1, which is characterized in that hydraulic in the step (1)
Expanding die includes mutually matched upper model cavity and drag chamber, workpiece to be added be placed in the upper model cavity and drag chamber it
Between, plug is placed in workpiece both-side opening to be added end and closing open end, is filled with liquid to type chamber by plug, makes the intracavitary formation of type
180-200MPa pressure, and 2~5s of pressure maintaining.
4. EGR shell oral area hole-crimped forming technique according to claim 1, which is characterized in that the Burring Punch is fixed
In punch retainer, the punch retainer is fixed in second lower template by vertical plate, the punch retainer and vertical
Plate is fixed in fixed plate.
5. EGR shell oral area hole-crimped forming technique according to claim 1, which is characterized in that one end of the second cope plate
The first limited post of hole flanging cavity plate height is limited when being provided with for installing.
6. EGR shell oral area hole-crimped forming technique according to claim 4, which is characterized in that the punch retainer with
Spring is provided between pressure plate II.
7. EGR shell oral area hole-crimped forming technique according to claim 1, which is characterized in that the limit plate and third
It is additionally provided with elastic component between cope plate, keeps limit plate tight to side pressure to be processed for providing elastic force.
8. EGR shell oral area hole-crimped forming technique according to claim 1, which is characterized in that described to roll with mold also
Including pedestal and plug fixed plate, the plug II is fixed on the pedestal by the plug fixed plate.
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| CN201811587034.XA CN109773019B (en) | 2018-12-25 | 2018-12-25 | EGR shell oral area hole-crimped forming technique |
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| CN201811587034.XA CN109773019B (en) | 2018-12-25 | 2018-12-25 | EGR shell oral area hole-crimped forming technique |
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| CN112439837B (en) * | 2020-11-05 | 2022-06-24 | 浙江三集不锈钢有限公司 | Four-way valve body production process |
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| CN203599365U (en) * | 2013-12-02 | 2014-05-21 | 北京佛罗伦萨散热器有限公司 | Automatic punching flexer-flanger |
| CN105983615A (en) * | 2015-01-27 | 2016-10-05 | 无锡尚华机械有限公司 | Inlet manifold flange machining technique |
| CN105081068A (en) * | 2015-09-15 | 2015-11-25 | 广州科技职业技术学院 | Double-end punching and hole flanging mold of circular tube |
| CN206009541U (en) * | 2016-08-31 | 2017-03-15 | 河南顿汉家用电器有限公司 | Thin-wall copper pipe tube wall pulls out aperture apparatus |
| CN207308741U (en) * | 2017-09-29 | 2018-05-04 | 泸州北方化学工业有限公司 | Punching flanging device |
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| CN109773019A (en) | 2019-05-21 |
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