CN108655249A - A kind of hydraulic expanding-forming pipe and its manufacturing process that local wall thickness thickens - Google Patents
A kind of hydraulic expanding-forming pipe and its manufacturing process that local wall thickness thickens Download PDFInfo
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- CN108655249A CN108655249A CN201710203069.8A CN201710203069A CN108655249A CN 108655249 A CN108655249 A CN 108655249A CN 201710203069 A CN201710203069 A CN 201710203069A CN 108655249 A CN108655249 A CN 108655249A
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- pipe
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- thickens
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
- B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
- B21D26/033—Deforming tubular bodies
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D53/00—Making other particular articles
- B21D53/88—Making other particular articles other parts for vehicles, e.g. cowlings, mudguards
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D21/00—Understructures, i.e. chassis frame on which a vehicle body may be mounted
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L9/00—Rigid pipes
- F16L9/02—Rigid pipes of metal
Abstract
A kind of hydraulic expanding-forming pipe and its manufacturing process that local wall thickness thickens, the hydraulic expanding-forming pipe tube body is big in the wall ratio tube wall wall thickness of the circumferentially upper part or all of R Angle Positions in section in axial direction vertical with axis, or/and, its tube body increases in stress concentration position wall thickness, and the wall thickness thicken it is axially consecutive along tube body；The wall thickness of R Angle Positions is 1.2t~6.0t, and t is tube wall wall thickness, mm.The hydraulic expanding-forming pipe design that the present invention is thickened by local wall thickness can improve part section rigidity, improve stress concentration, and pipe increases at the angles R and corresponding stress concentration position thickness, it is possible to prevente effectively from the larger generation wall thickness excessive thinning of local bulging amount and cracking.
Description
Technical field
The present invention relates to pipe fitting hydraulic expanding-forming field more particularly to a kind of hydraulic expanding-forming pipe that local wall thickness thickens and its at
Shape method.
Background technology
Fittings hydraulic formation technology is suitable for processing the light body component of hollow variable cross-section, is obtained in fields such as automobile, Aeronautics and Astronautics
Extensive use is arrived.Hydroformed part cross sectional shape is various, including circle, ellipse, rectangle, V-arrangement, U-shaped etc., wherein square
Tee section is because section rigidity height is that hydroformed part section preferably selects.
Current hydroformed part pipe processing mostly uses multistep bending or roll-in round steel pipe, and circular tube is in bend pipe
It is relatively easy in technique, but when parts locally bulging amount is larger is easy that wall thickness excessive thinning is occurring or even is cracking, particularly
To rectangular section, in section R angular zones part, bulging amount is big, is easy to happen wall thickness excessive thinning and cracking, considers that formability is past
Toward needing to sacrifice ideal cross sectional shape, this patent proposes a kind of hydraulic expanding-forming pipe that local wall thickness thickens design and forming side
Method, the hydraulic expanding-forming pipe design thickened by local wall thickness can further increase part section rigidity, improve stress concentration, pipe
Base uses almag extruded tube or roll-in steel pipe, pipe that can be processed as the shapes such as rectangle, and in the angles R and corresponding stress concentration
Position wall thickness increases, from formability angle it is possible to prevente effectively from the larger generation wall thickness excessive thinning of local bulging amount and cracking.
China Patent Publication No. CN101172292A disclose " for vehicle hydroforming tubular articles and hydraulic pressure at
The method of the tubular articles of shape " is related to automobile hydraulic formed parts, is intensity, the rigidity of structural enhancing regional area, zero
The generally " T " shaped tubular articles with side wall are devised in part axial direction；China Patent Publication No. CN105312372A is disclosed
Entitled " automobile accessory frame and manufacturing process ", being related to a kind of automobile accessory frame and manufacturing process, the subframe has rectangle
Section feature proposes to shape by single wall thickness cylindrical tube；103920787 A of China Patent Publication No. CN, disclose entitled
" a kind of hydraulic forming method of pipe fitting torsion beam ", is related to a kind of tubulose torsion beam, cross sectional shape includes rectangle, U-shaped, V-arrangement, is carried
Go out and shaped using pipe, is needed to use substep forming mode according to section feature, each section of hydroformed part is gradually shaped,
So that round tube deformation is substantially deformed into final part shape, reaches size requirement finally by hydraulic expanding-forming.
Therefore, based on the above patent analysis, these patents, which are related to hydroformed part, does not have partial thickening feature, adopts
It is equal thickness pipe with pipe, without reference to a kind of design of hydraulic expanding-forming pipe that local wall thickness thickens and manufacturing process.
Invention content
It is an object of the invention to propose a kind of hydraulic expanding-forming pipe and its manufacturing process that local wall thickness thickens, there is part
The hydraulic expanding-forming tube design that wall thickness thickens feature can improve hydroformed part section rigidity, improve stress concentration.
In order to achieve the above objectives, the technical scheme is that：
A kind of hydraulic expanding-forming pipe that local wall thickness thickens, tube body is in section circumferential direction in axial direction vertical with axis
The wall ratio tube wall wall thickness of part or all of R Angle Positions is big, or/and, tube body increases in stress concentration position wall thickness,
And the wall thickness thicken it is axially consecutive along tube body；The wall thickness of the wall thickness of R Angle Positions is 1.2t~6.0t, and t is tube wall wall thickness,
mm。
Preferably, the wall thickness is thickened characterized by being thickened to pipe interior direction or pipe lateral direction thickens, or to inside and outside two
A direction thickens simultaneously.
The manufacturing process for the hydraulic expanding-forming pipe that local wall thickness of the present invention thickens comprising following steps：
A) pipe is processed, and pipe is cross-section aluminium alloy, magnesium-alloy tube or the roll-in etc. of technique molding by extrusion processing
Section steel pipe；
According to bulging pipe feature, pipe cross section is non-circular shape, by extrusion process or rolling process pipe in circumferential R
Angle Position wall thickness is increased to 1.5t~6.0t；
According to bulging pipe feature, pipe cross section is non-circular shape, by extrusion process or rolling process pipe right
Part stress concentration position wall thickness is answered to be increased to 1.5t~6.0t；
It is circle according to bulging pipe feature or pipe cross section, in the corresponding larger position wall of bulging pipe part bulging amount
It is 1.5t~6.0t that thickness, which increases,；
It is circle according to bulging pipe feature or pipe cross section, in corresponding bulging pipe stress concentration position, wall thickness increases
For 1.5t~6.0t；
B) pipe is bent, using numerical-controlled bending or mold bending process one or multi-step bend pipe；Bend pipe mould is cut with pipe
Face shape design；
C) preform makes pipe fitting be subsequently inputted into hydraulic expanding die and undercut does not occur by one or multi-step mould punching；
D) hydraulic expanding-forming, end part seal head design with the shape, partly or entirely hole synchronous hydraulic punching during hydraulic expanding-forming；
E) pipe end processing and remaining hole processing, using end laser cutting or end stamping or end mill or sawing mode
Remove end excess stock, or realize one-mold multiple-member part separation, remaining hole laser cutting or stamping processing, complete part at
Shape.
Further, in step a), the aluminium-alloy pipe, magnesium-alloy tube or roll-in steel pipe have cross-section feature：
According to bulging pipe feature, pipe cross section is non-circular shape, by extrusion process or rolling process pipe in circumferential R
Angle Position wall thickness is increased to 1.5t~6.0t；
According to bulging pipe feature, pipe cross section is non-circular shape, by extrusion process or rolling process pipe right
Part stress concentration position wall thickness is answered to be increased to 1.5t~6.0t；
It is circle according to bulging pipe feature or pipe cross section, in the corresponding larger position wall thickness of parts locally bulging amount
It is 1.5t~6.0t to increase；
It is circle according to bulging pipe feature or pipe cross section, is in corresponding part stress concentration position wall thickness increase
1.5t~6.0t.
Preferably, in step b), when use numerical-controlled bending technique, and bulging pipe has space continuous bend feature, pipe
When rotation is interfered with bending mould, bend pipe is removed, multistep bend pipe on another set of bending mould is put into.
Preferably, when bulging pipe is without continuous bend feature, in step a), design pipe cross-sectional shape keeps pipe straight
It connects and is put into hydraulic expanding die and does not occur undercut, the direct hydraulic expanding-forming of pipe omits step b), step c).
General cross-section thickness Element Design needs to increase part section when intensity, rigidity property are less than design object
Area, or increase part thickness, weight can increase, and the hydraulic expanding-forming pipe that the local wall thickness thickens is a kind of light-weight design.
It should be noted that manufacturing process of the present invention is not only applicable to mentioned above there is local wall thickness to thicken spy
Hydraulic expanding-forming pipe is levied, while being suitable for conventional pipe hydroformed part, local bulging amount is larger to cause wall thickness excessive to improve
It is thinned and cracks.
Step b) pipes are bent, using numerical-controlled bending or mold bending process bend pipe.Conventional hydraulic forming pipe is generally
Equal thickness round tube, bend pipe is relatively easy, and to above-mentioned pipe, bend pipe uses mold to bend as possible, and bend pipe mould is with pipe section
Shape designs.When use numerical-controlled bending technique, and part have space continuous bend feature, pipe rotation with bending mould interfere
When, bend pipe is removed, multistep bend pipe on another set of bending mould is put into.
Beneficial effects of the present invention：
The hydraulic expanding-forming tube design that local wall thickness of the present invention thickens, pair cross-section shape are rectangle or the hydraulic pressure of other shapes
Pipe fitting is shaped, R angular zone wall thickness thickens as 1.2t-6.0t in section, and the feature that the wall thickness thickens runs through hydroformed part axial direction
Direction, in non-R angular zones, corresponding stress concentration position wall thickness thickens as 1.2t-6.0t, and equally, which, which thickens feature, runs through
Hydroformed part axial direction, above-mentioned wall thickness thicken that feature can be thickened to pipe interior direction or pipe lateral direction thickens, or
It is thickened simultaneously to inside and outside both direction；The hydraulic expanding-forming tube design of feature is thickened with local wall thickness can improve hydroforming
Part section rigidity improves stress concentration, and the above R angular zones wall thickness thickens feature or non-R angular zones wall thickness feature can be independent
In the presence of or exist simultaneously.
Description of the drawings
Fig. 1 is the pipe fitting subframe schematic diagram that R Angle Position wall thickness in section of the present invention thickens；
Fig. 2 is the schematic diagram of the section A of Fig. 1；
Fig. 3 is the schematic diagram of the section B of Fig. 1；
Fig. 4 is the pipe fitting subframe pipe schematic diagram that R Angle Position wall thickness in section of the present invention thickens；
Fig. 5 is the schematic diagram of the section C of Fig. 4；
Fig. 6 is the pipe fitting subframe numerical controlled bending of pipe schematic diagram that R Angle Position wall thickness in section of the present invention thickens；
Fig. 7 is the schematic diagram of the section D of Fig. 6；
Fig. 8 is the pipe fitting subframe numerical controlled bending of pipe axis of bending schematic diagram that R Angle Position wall thickness in section of the present invention thickens；
Fig. 9 is the signal for the pipe fitting subframe hydraulic forming mold undercut inspection that R Angle Position wall thickness in section of the present invention thickens
Figure；
Figure 10 is the pipe fitting torsion beam that stress concentration position of the present invention wall thickness thickens；
Figure 11 is the schematic diagram of the section E of Figure 10；
Figure 12 is the schematic diagram of the section F of Figure 10；
Figure 13 is the schematic diagram of the section G of Figure 10；
Figure 14 is the pipe fitting torsion beam pipe schematic diagram that stress concentration position of the present invention wall thickness thickens；
Figure 15 is the schematic diagram of the section H of Figure 14.
Specific implementation mode
With reference to specific embodiments and the drawings, the present invention is further explained.
Fig. 1~Fig. 3 is participated in, the hydraulic expanding-forming pipe that a kind of local wall thickness of the invention thickens, tube body is in axial direction
The wall ratio tube wall wall thickness of the circumferentially upper part or all of R Angle Positions in the section vertical with axis is big, or/and, tube body exists
Stress concentration position wall thickness increases, and, which thickens axially consecutive along tube body；The wall thickness of the wall thickness of R Angle Positions be 1.2t~
6.0t, t are tube wall wall thickness, mm.
Preferably, the wall thickness is thickened characterized by being thickened to pipe interior direction or pipe lateral direction thickens, or to inside and outside two
A direction thickens simultaneously.
The manufacturing process for the hydraulic expanding-forming pipe that local wall thickness of the present invention thickens comprising following steps：
A) pipe is processed, and pipe is cross-section aluminium alloy, magnesium-alloy tube or the roll-in etc. of technique molding by extrusion processing
Section steel pipe；
According to bulging pipe feature, pipe cross section is non-circular shape, by extrusion process or rolling process pipe in circumferential R
Angle Position wall thickness is increased to 1.5t~6.0t；
According to bulging pipe feature, pipe cross section is non-circular shape, by extrusion process or rolling process pipe right
Part stress concentration position wall thickness is answered to be increased to 1.5t~6.0t；
It is circle according to bulging pipe feature or pipe cross section, in the corresponding larger position wall of bulging pipe part bulging amount
It is 1.5t~6.0t that thickness, which increases,；
It is circle according to bulging pipe feature or pipe cross section, in corresponding bulging pipe stress concentration position, wall thickness increases
For 1.5t~6.0t；
B) pipe is bent, using numerical-controlled bending or mold bending process one or multi-step bend pipe；Bend pipe mould is cut with pipe
Face shape design；
C) preform makes pipe fitting be subsequently inputted into hydraulic expanding die and undercut does not occur by one or multi-step mould punching；
D) hydraulic expanding-forming, end part seal head design with the shape, partly or entirely hole synchronous hydraulic punching during hydraulic expanding-forming；
E) pipe end processing and remaining hole processing, using end laser cutting or end stamping or end mill or sawing mode
Remove end excess stock, or realize one-mold multiple-member part separation, remaining hole laser cutting or stamping processing, complete part at
Shape.
Further, in step a), the aluminium-alloy pipe, magnesium-alloy tube or roll-in steel pipe have cross-section feature：
According to bulging pipe feature, pipe cross section is non-circular shape, by extrusion process or rolling process pipe in circumferential R
Angle Position wall thickness is increased to 1.5t~6.0t；
According to bulging pipe feature, pipe cross section is non-circular shape, by extrusion process or rolling process pipe right
Part stress concentration position wall thickness is answered to be increased to 1.5t~6.0t；
It is circle according to bulging pipe feature or pipe cross section, in the corresponding larger position wall thickness of parts locally bulging amount
It is 1.5t~6.0t to increase；
It is circle according to bulging pipe feature or pipe cross section, is in corresponding part stress concentration position wall thickness increase
1.5t~6.0t.
Preferably, in step b), when use numerical-controlled bending technique, and bulging pipe has space continuous bend feature, pipe
When rotation is interfered with bending mould, bend pipe is removed, multistep bend pipe on another set of bending mould is put into.
Preferably, when bulging pipe is without continuous bend feature, in step a), design pipe cross-sectional shape keeps pipe straight
It connects and is put into hydraulic expanding die and does not occur undercut, the direct hydraulic expanding-forming of pipe omits step b), step c).
Embodiment one
A kind of fittings hydraulic formation that R Angle Position wall thickness in section thickens, as shown in FIG. 1 to 3, wherein t are 2.0mm, 4
A angles R wall thickness thickens, specific to be processed for convenience of post forming mold, and wall thickness thickens 2 to pipe medial thickness, maximum position wall thickness
Times, it fades away to both sides, it is to exist which, which thickens feature in pipe fitting whole length direction,.
The subframe pipe is as shown in Figure 4, Figure 5, pipe rectangular cross-section, for the cross-section aluminium shaped by extrusion process
Compo pipe realizes that wall thickness thickens feature in 4 R Angle Positions of rectangle pipe by extrusion process.
Pipe is by numerical controlled bending of pipe bend pipe, and schematic diagram after bend pipe as shown in Figure 6, Figure 7, bend pipe mould designs with the shape, such as Fig. 8
Shown, totally 8 bent angles, all bent angles do not need bending air in approximately the same plane during numerical controlled bending of pipe, can be by a set of
Rectangular bend mold realizes continuous bend.
Judge after bend pipe the direct hydroforming of elbow member whether undercut schematic diagram as shown in figure 9, black for elbow member grey
For hydroformed part, it can be seen that elbow member tentatively judges that direct hydroforming is not stung completely inside hydroformed part
Side, it is convenient to omit preform process, it should be noted that the method is only preliminary judgement, can specifically pass through simulation means mould
The quasi- direct hydroforming clamping process of elbow member can be omitted preform process judged to present case part.
Hydraulic expanding die end part seal head designs with the shape, rectangular cross-section, hydraulic expanding-forming process synchronous hydraulic punching.
End excess stock is removed by laser cutting, obtains the pipe fitting subframe part that section R Angle Position wall thickness thickens.
It should be noted that due to wall thickness reduction in Bulging Process, actual parts are generally less than in the practical wall thickness of R Angle Positions
Design value.
It should be noted that since there is preferable section rigidity, general subframe relatively to mostly use with square for rectangular section
Tee section, due to local bulging in forming process, section R Angle Position wall thickness excessive thinnings or cracking are the problem of being most commonly encountered,
There is case section R Angle Positions wall thickness to thicken the pipe fitting subframe of feature compared with equal thickness part, have better intensity and
Rigidity, simultaneously because pipe is rectangle, and pipe has been thickened in the angles R wall thickness, can be effectively improved R Angle Positions wall in forming process
Thick excessive thinning and cracking can be bent after bend pipe further, since pipe is rectangular section tube and be put into hydraulic forming mold, can
To omit preform process.
Embodiment two
The pipe fitting torsion beam that a kind of stress concentration position wall thickness thickens, as shown in Figure 10~Figure 13, torsion beam can be divided into 3
Part, middle part section are V-arrangement, and such as section E, both ends rectangular cross-section, such as section G, centre is changeover portion.
Torsion beam is semi-independent rear suspension body element, is turned round by curved in car running process, and service condition is harsh, one
As torsion beam stress concentration position be happened at changeover portion U-lag top, present case as shown in fig. 6, wherein t be 2.5mm, in correspondence
It is 1.5 times that stress concentration position wall thickness, which thickens, is faded away to both sides, which thickens feature is in pipe fitting whole length direction
In the presence of such as Fig. 6, in section, E, section G corresponding positions equally there is wall thickness to thicken feature.
Pipe is cross-section roll-in steel pipe as shown in Figure 14, Figure 15；Increase in subsequent parts stress concentration corresponding position wall thickness
Thickness is 1.5 times.
To case pipe fitting torsion beam without bend pipe feature, bend pipe is not needed.
It is generally pipe to pipe fitting torsion beam part pipe, because of middle part section V-arrangement feature, direct punching press V-arrangement pipe can be sent out
Raw rotation, at least needs a step preform；Case odd-shaped cross section, lower part is similar round, and top is similar to rectangle, top centre position
There is 5mm recessed, so that V-arrangement is pushed process pipe fitting and stablize, case odd-shaped cross section width is less than part cross-section width, and pipe is put into liquid
Undercut does not occur for compression mould, it is convenient to omit preform, direct hydraulic expanding-forming are final part shape.
Hydraulic expanding die end part seal head designs with the shape, rectangular cross-section.
End excess stock is removed by laser cutting, obtains the pipe fitting torsion beam part that section R Angle Position wall thickness thickens.
It should be noted that due to wall thickness reduction in Bulging Process, actual parts are generally less than in the practical wall thickness of R Angle Positions
Design value.
There is wall thickness to thicken feature torsion beam and be beneficial to improve stress concentration for stress concentration position in the embodiment of the present invention,
Under equal performance requirement condition, weight is lighter compared with equal thickness torsion beam, is a kind of light-weight design.
Claims (6)
1. a kind of hydraulic expanding-forming pipe that local wall thickness thickens, which is characterized in that its tube body is vertical with axis in axial direction
The wall ratio tube wall wall thickness of the circumferentially upper part or all of R Angle Positions in section is big, or/and, tube body is in stress concentration position
Wall thickness increases, and, which thickens axially consecutive along tube body；The wall thickness of the wall thickness of R Angle Positions is 1.2t~6.0t, and t is tube body
Side wall wall thickness, mm.
2. the hydraulic expanding-forming pipe that local wall thickness as described in claim 1 thickens, characterized in that the wall thickness thicken characterized by
Pipe interior direction thickens or pipe lateral direction thickens, or is thickened simultaneously to inside and outside both direction.
3. the manufacturing process for the hydraulic expanding-forming pipe that local wall thickness as claimed in claim 1 or 2 thickens, characterized in that including such as
Lower step：
A) pipe is processed, and pipe is aluminium-alloy pipe, magnesium-alloy tube or the roll-in steel pipe of technique molding by extrusion processing；
B) pipe is bent, using numerical-controlled bending or mold bending process one or multi-step bend pipe；Bend pipe mould is with pipe section shape
Shape designs；
C) preform makes pipe fitting be subsequently inputted into hydraulic expanding die and undercut does not occur by one or multi-step mould punching；
D) hydraulic expanding-forming, end part seal head design with the shape, partly or entirely hole synchronous hydraulic punching during hydraulic expanding-forming；
E) pipe end processing and remaining hole processing are removed using end laser cutting or end stamping or end mill or sawing mode
End excess stock, or realize one-mold multiple-member part separation, remaining hole laser cutting or stamping processing, complete hydraulic expanding-forming pipe at
Shape.
4. the manufacturing process for the hydraulic expanding-forming pipe that local wall thickness as claimed in claim 3 thickens, characterized in that in step a),
The aluminium-alloy pipe, magnesium-alloy tube or roll-in steel pipe have cross-section feature：
According to bulging pipe feature, pipe cross section is non-circular shape, by extrusion process or rolling process pipe in the circumferential angles R position
It sets wall thickness and is increased to 1.5t~6.0t；
According to bulging pipe feature, pipe cross section is non-circular shape, by extrusion process or rolling process pipe corresponding zero
Part stress concentration position wall thickness is increased to 1.5t~6.0t；
It is circle according to bulging pipe feature or pipe cross section, increases in the corresponding larger position wall thickness of parts locally bulging amount
For 1.5t~6.0t；
It is circle according to bulging pipe feature or pipe cross section, it is 1.5t that in corresponding part stress concentration position, wall thickness, which increases,
~6.0t.
5. the manufacturing process for the hydraulic expanding-forming pipe that local wall thickness as claimed in claim 3 thickens, characterized in that in step b),
When use numerical-controlled bending technique, and bulging pipe have space continuous bend feature, pipe rotation with bending mould interfere when, remove
Bend pipe is put into multistep bend pipe on another set of bending mould.
6. the manufacturing process for the hydraulic expanding-forming pipe that local wall thickness as claimed in claim 3 thickens, characterized in that when bulging pipe without
Continuous bend feature, in step a), design pipe cross-sectional shape allows pipe to be directly placed into hydraulic expanding die not occur
Undercut, the direct hydraulic expanding-forming of pipe omit step b), step c).
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| Application Number | Priority Date | Filing Date | Title |
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Family
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110576074A (en) * | 2019-08-19 | 2019-12-17 | 河北欧姆隆机械有限公司 | manufacturing process of flattened bent pipe |
| CN112780834A (en) * | 2021-02-23 | 2021-05-11 | 广东保辉建筑工程有限公司 | Continuous lengthening and jacking construction method for pipeline |
| CN114054574A (en) * | 2021-10-25 | 2022-02-18 | 成都飞机工业（集团）有限责任公司 | Thin-wall T-shaped rib characteristic local reinforcement forming method based on flexible liquid filling |
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| CN110576074A (en) * | 2019-08-19 | 2019-12-17 | 河北欧姆隆机械有限公司 | manufacturing process of flattened bent pipe |
| CN112780834A (en) * | 2021-02-23 | 2021-05-11 | 广东保辉建筑工程有限公司 | Continuous lengthening and jacking construction method for pipeline |
| CN112780834B (en) * | 2021-02-23 | 2022-11-18 | 广东保辉建筑工程有限公司 | Continuous lengthening and jacking construction method for pipeline |
| CN114054574A (en) * | 2021-10-25 | 2022-02-18 | 成都飞机工业（集团）有限责任公司 | Thin-wall T-shaped rib characteristic local reinforcement forming method based on flexible liquid filling |
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