CN108480470A - A kind of dual irregular pre-deformation device and method of precision bend pipe - Google Patents
A kind of dual irregular pre-deformation device and method of precision bend pipe Download PDFInfo
- Publication number
- CN108480470A CN108480470A CN201810178830.1A CN201810178830A CN108480470A CN 108480470 A CN108480470 A CN 108480470A CN 201810178830 A CN201810178830 A CN 201810178830A CN 108480470 A CN108480470 A CN 108480470A
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- Prior art keywords
- deformation
- pipe fitting
- predeformation
- irregular
- pinch roller
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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
- B21D31/00—Other methods for working sheet metal, metal tubes, metal profiles
-
- 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
- B21D7/00—Bending rods, profiles, or tubes
- B21D7/16—Auxiliary equipment, e.g. for heating or cooling of bends
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Rolls And Other Rotary Bodies (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
Abstract
The invention discloses a kind of dual irregular pre-deformation devices and method of accurate bend pipe.Two groups of predeformation components, which are arranged in pipe fitting, needs both sides at flexural deformation, in every group of predeformation component, removable crotch is U-shaped structure, outside is connect with the output rod of hydraulic cylinder in the middle part of the U-shaped structure of removable crotch, deformation pinch roller is coaxially fixedly set in outside shaft, the both ends of shaft are articulated with the U-shaped structure both ends branch of removable crotch by taper roll bearing, and deformation pinch roller contacts tube surface；The deformation pinch roller moved on crotch is driven to apply predeformation pressure to tube surface from Driven by Hydraulic Cylinder.The present invention is suitable for reducing irregular cross section distortion during accurate bend pipe, has good controllability for different degrees of cross section distortion, can largely reduce tube wall during bending machine bend pipe occur fold, rupture possibility.
Description
Technical field
The present invention relates to a kind of pipe fitting deformation pretreating device and method, it is specifically related to a kind of the dual of accurate bend pipe
Irregular pre-deformation device and method belong to material for reducing the irregular aberration problems in pipe fitting section during accurate bend pipe
Cold processing technique field.
Background technology
With the fast development of China's manufacturing industry, the demand of various material bend pipes is also quickly being increased.Due to application
The increasingly complexity of scene, the shape need of metal tube also complicates therewith, but current pipe bending technique is required in accurate bend pipe
Under corresponding accuracy standard is also not achieved.And pipe fitting is when being bent, the material outside of crooked position bear tangential stress and
It stretches, inside material is born circumferential compressive force and shunk, due to the factor of the mechanical property of material etc., pipe fitting crooked position
Often there is phenomena such as fold, rupture.The deformation of crooked position is influenced by pipe fitting bending radius and relative thickness, bending radius
Smaller with relative thickness, the probability that cross section distortion occurs in bending part is bigger, and this distortion can cause sectional area to become smaller, and
Each radial deformation degree of this distortion in axially distinct section is different, largely effects on the quality and property of pipe fitting
Energy.Therefore irregular distortion, promotion bending quality are axially and radially generated in section during needing one kind that can reduce bend pipe
Device.
Invention content
According to the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is to：Provide a kind of accurate bend pipe
Dual irregular pre-deformation device and method, can prevent occurring fold during bend pipe, reduce pipe fitting in accurate bend pipe process
The irregular cross section distortion of middle generation so that pipe fitting flexural deformation is accurate, promotes accurate bending quality.
The present invention solve above-mentioned technical problem the technical solution adopted is that：
One, a kind of dual irregular pre-deformation device of accurate bend pipe：
Including the identical predeformation component of two groups of structures, two groups of predeformation components, which are arranged in pipe fitting, to be needed at flexural deformation
Both sides, every group of predeformation component includes hydraulic cylinder, removable crotch, deformation pinch roller, shaft and taper roll bearing；Described
Removable crotch is U-shaped structure, and outside is connect with the output rod of hydraulic cylinder in the middle part of the U-shaped structure of removable crotch, deforms pinch roller
It is coaxially fixedly set in outside shaft, the both ends of shaft are articulated with the U-shaped structure two of removable crotch by taper roll bearing
Branch, deformation pinch roller is held to contact tube surface；Drive the deformation pinch roller on removable crotch to tube surface from Driven by Hydraulic Cylinder
Apply predeformation pressure.
The sleeve for axially position is set in shaft between deformation pinch roller and the taper roll bearing.
The bearing (ball) cover for shaft axial limiting is equipped at the both ends of the shaft, bearing (ball) cover is bolted
It is installed in the U-shaped structure both ends branch of removable crotch.
For the taper roll bearing for carrying shaft axially and radially pressure, bearing (ball) cover and sleeve play axial direction
Fixed function.
The deformation pinch roller is U-lag wheel, and the peripheral surface of U-lag wheel is the surface of revolution formed by indent circular arc, indent
The diameter of circular arc is more than the diameter of pipe fitting.
Two groups of predeformation components, which are asymmetricly arranged in pipe fitting, needs the both sides of same circumference at flexural deformation, and two groups pre-
Force direction that two deformation pinch rollers in deformed component press to pipe fitting arranged with pipe fitting by the equal out of plumb of plane where curved direction,
The asymmetric force to be pressed to pipe fitting by two deformation pinch rollers realizes irregular cross-section radial predeformation.
Two groups of predeformation components are arranged symmetrically with pipe fitting by plane where curved direction.
Two groups of predeformation components can integrally pipe fitting need on the sectional plane at flexural deformation carry out rotation and translation and
The position of adjustment deformation pinch roller, and then force direction and power size that the deformation pinch roller in predeformation component presses to pipe fitting are adjusted,
What wherein force direction changed is the power that the deformation pinch roller in predeformation component presses to pipe fitting and pipe fitting by plane where curved direction
Between angle.
Two, a kind of dual irregular predeformation method of accurate bend pipe：
It is handled before pipe fitting carries out flexural deformation processing by being mounted with the pre-deformation device of two groups of predeformation components,
Concrete mode is：Two groups of predeformation components, which are asymmetricly arranged in pipe fitting, needs the both sides of circumference at flexural deformation central cross-section,
Two deformation pinch rollers in two groups of predeformation components need the outside of flexural deformation to synchronize inclination arrangement to pipe fitting so that two changes
The force direction that shape pinch roller applies to pipe fitting and pipe fitting by plane where curved direction it is symmetrical and with pipe fitting it is equal by plane where curved direction
Out of plumb, two deformation pinch rollers apply identical predeformation pressure to tube surface so that pipe fitting needs flexural deformation central cross-section to become
At irregular ellipse；
Then flexural deformation processing is carried out to pipe fitting again.
The irregular elliptical tip and blunt nosed line are located at pipe fitting by plane where curved direction, irregular elliptical
Tip needs the inside of flexural deformation towards pipe fitting, the irregular elliptical blunt nosed outside that flexural deformation is needed towards pipe fitting.
The present invention can be played using crotch is moved according to two pipe fitting material, pipe fitting radius, bend pipe precision adjusting changes
The distance between shape pinch roller, to realize that the distortion for different cross section position carries out different degrees of predeformation.
In specific implementation, the external servo hydraulic system of hydraulic cylinder connection, removable crotch is threaded with hydraulic cylinder.
Hydraulic cylinder with servo-drive system can realize deformation pinch roller can according to the different predeformation needed for axially distinct cross section distortion into
The different displacement of row.
The present invention is irregular in view of the cross section distortion during bend pipe axially and radially, therefore is carrying out predeformation
Dual irregular pre-treatment can be carried out to pipe fitting according to corresponding axially and radially distort of different cross section when processing.
Different cross section is in the non-of Bending Deformation axially and radially when the pre-deformation device of the present invention is in view of pipe fitting bending
Systematicness solves the problems, such as this using the predeformation of variable-angle and size.Wherein upper predeformation pinch roller assembly is relative to pipe
The relative position and angle in the part center of circle are adjusted in the amplitude of oscillation, are generated in various degree to realize that the difference in axially distinct section is radial
The effect of predeformation.
The present invention considers the mechanics principle that predeformation generates, and predeformation pinch roller is using small curvature circular arc substitution tradition and pipe
The identical circular arc of diameter, ensure that the surplus of predeformation.Small curvature circular arc refers to that the diameter for the interior concave arc for deforming pinch roller is more than pipe
The curvature of the diameter of part, i.e., interior concave arc is less than the curvature of pipe fitting.
Under normal conditions, during carrying out flexural deformation formation bend pipe using straight pipe as pipe fitting, the outboard tube of pipe fitting
Wall tension moves, and the outside wall compression movement of pipe fitting, the lateral surface of pipe fitting is often ruptured due to being stretched, pipe fitting it is interior
Often there is fold due to being pressurized in side, and final also so that the tube section of flexural center deforms, and formation is irregular
Ellipse.
The pipe fitting of straight pipe is carried out predeformation by device and method proposed by the present invention before flexural deformation, at place to be bent
Predeformation is at irregular oval tube section corresponding with final bend pipe result, then carries out flexural deformation so that is carrying out bending change
Shape is not in fold and rupture after forming bend pipe process and acquisition bend pipe, and the tube section for also reducing flexural center occurs
Distortion, keep the circular cross-section of straight pipe.
Beneficial effects of the present invention：
The present invention can connect servo hydraulic system, and accurately Bit andits control is carried out by servo-drive system, realize different cut
Face generates different degrees of predeformation.
Different cross section is differed in cross section distortion axially and radially during the present invention considers pipe fitting bend pipe, has been used
Holosymmetric pre-deformation device cannot achieve the different degrees of predeformation of different directions, therefore use the adjustable predeformation in drift angle
Device, can be well realized the predeformation of the radially different degree of different cross section, finally realizes irregular dual predeformation.
The present invention is suitable for reducing irregular cross section distortion during accurate bend pipe, has for different degrees of cross section distortion
Good controllability, dramatically reduce issuable cross section distortion during accurate bend pipe, pipe fitting inner wall fold and
The possibility of outer wall rupture.
Description of the drawings
Fig. 1 is pre-deformation device of the present invention and its schematic diagram to pipe fitting arrangement.
Fig. 2 is the left view of Fig. 1.
Fig. 3 is the axial deformation schematic diagram at A under partial enlargement horizontal view angle after bend pipe predeformation in Fig. 2.
Fig. 4 is the cross-section radial deformation schematic diagram at B-section after bend pipe predeformation in Fig. 3.
Fig. 5 is the cross-section radial deformation schematic diagram at the sections C after bend pipe predeformation in Fig. 3.
Fig. 6 is the cross-section radial deformation schematic diagram at the sections D after bend pipe predeformation in Fig. 3.
Fig. 7 is the final cross sectional shape that the sections D shown in Fig. 6 after pre-treatment obtain after bend pipe process.
In figure：Hydraulic cylinder 1, removable crotch 2, predeformation pinch roller 3, shaft 4, bearing (ball) cover 5, sleeve 6, taper roller axis
Hold 7, pipe fitting 8.
Specific implementation mode
The invention will be further described with reference to the accompanying drawings and examples.
As shown in Figure 1, present invention specific implementation includes the identical predeformation component of two groups of structures, two groups of predeformation components point
It includes hydraulic cylinder 1, removable crotch 2, deformation pressure not to be arranged in pipe fitting 8 and need both sides at flexural deformation, every group of predeformation component
Wheel 3, shaft 4 and taper roll bearing 7；Removable crotch 2 is U-shaped structure, move in the middle part of the U-shaped structure of crotch 2 outside with
The output rod of hydraulic cylinder 1 connects, and deformation pinch roller 3 is coaxially fixedly set in outside shaft 4, and the both ends of shaft 4 pass through taper roller
Bearing 7 is articulated with the U-shaped structure both ends branch of removable crotch 2, and deformation pinch roller 3 contacts 8 surface of pipe fitting；Deform pinch roller 3 and circle
It is set with the sleeve 6 for axially position in shaft 4 between taper roller bearing 7, is equipped at the both ends of shaft 4 and is used for shaft 4
The bearing (ball) cover 5 of axial limiting, bearing (ball) cover 5 are bolted the U-shaped structure both ends branch for being installed on removable crotch 2
On.
The deformation pinch roller 3 moved on crotch 2 is driven to apply predeformation pressure to 8 surface of pipe fitting from the driving of hydraulic cylinder 1.
Deformation pinch roller 3 is U-lag wheel, and the peripheral surface of U-lag wheel is the surface of revolution formed by indent circular arc, interior concave arc
Diameter is more than the diameter of pipe fitting 8, i.e., the curvature of interior concave arc is less than the curvature of pipe fitting 8.
Two groups of predeformation components can integrally pipe fitting 8 need on the sectional plane at flexural deformation carry out rotation and translation and
The position of adjustment deformation pinch roller 1, and then adjust the force direction that presses to pipe fitting 8 of deformation pinch roller 1 in predeformation component and power is big
It is small.In specific implementation, it can be fixed pinch roller 1 is deformed one of in two predeformation components, another deforms pinch roller 1 to pipe
The force direction and power size that part 8 presses are adjusted by deforming position of the pinch roller 1 in the tube section of pipe fitting 8 and being adjusted.
In same section since different radial cross section distortions differ, required predeformation is irregular, therefore is made
With the adjustable crotch in drift angle, band dynamic deformation pinch roller realizes the different degrees of predeformation of cross-section radial by adjusting corresponding drift angle.
To realize the dual of the different radially different degree predeformation in the different degrees of predeformation of different cross section and same section in the axial direction
Irregular predeformation.
Before pipe fitting 8 carries out flexural deformation processing, as depicted in figs. 1 and 2, two groups of predeformation components are asymmetricly arranged
The both sides of circumference at flexural deformation central cross-section are needed in pipe fitting 8, two deformation pinch rollers 1 in two groups of predeformation components are to pipe fitting
8, which need the outside of flexural deformation to synchronize, is in tilted layout so that the force direction that two deformation pinch rollers 1 apply to pipe fitting 8 is with pipe fitting 8 by curved
Plane where direction is symmetrically and with pipe fitting 8 by the equal out of plumb of plane where curved direction.
Two deformation pinch rollers 1 apply identical predeformation pressure to 8 surface of pipe fitting, apply after pressure as shown in figure 3, in Fig. 3
Dotted line refer to pipe fitting pass through the true form of pre-treatment rear tubular member outer wall in an axial direction.
Section becomes approximate irregular ellipse everywhere in after pipe fitting predeformation in Fig. 3, and especially pipe fitting 8 needs curved
Bent center of deformation section becomes approximate oval irregular ellipse, such as egg shape.The tip of irregular ellipse and blunt nosed
Line is located at pipe fitting 8 by plane where curved direction, and the tip of irregular ellipse needs the inside of flexural deformation towards pipe fitting 8, no
The blunt nosed outside that flexural deformation is needed towards pipe fitting 8 of regular ellipse.Fig. 4 is the cross sectional shape after B-section predeformation in Fig. 3,
Fig. 5 is the cross sectional shape after the predeformation of the sections C in Fig. 3, and Fig. 6 is the cross sectional shape after the predeformation of the sections D in Fig. 3, the point in figure
Setting-out refers to actual cross-section shape of the section after pre-treatment.
Then flexural deformation is carried out to pipe fitting 8, arranged at inner side of pipe fitting is the tip of irregular ellipse during bend pipe, outside pipe fitting
Side is the blunt nosed of irregular ellipse.During bend pipe, arranged at inner side of pipe fitting tip is pressurized, the blunt nosed tension in outside.Fig. 7 is shown in Fig. 6
The final cross sectional shape that the sections D after pre-treatment obtain after bend pipe process, wherein dotted line is after flexural deformations
The final shape in section.
Thus the present invention is final makes the section of the pipe fitting 8 after flexural deformation still be held round, the pipe after flexural deformation
Part inner side and outer side is not in fold and fracture phenomena.
In the manufacturing of specific implementation, pre-deformation device of the invention is mutually arranged close to flexural deformation device adjacent
Station, predeformation process are carried out after the predeformation of the present invention again immediately before the progress of flexural deformation process by pre-deformation device
Handle flexural deformation.
In specific implementation, predeformation is become while transporting pipe fitting and advancing as flexural deformation to the present invention
Shape process is connected by hydraulic cylinder and moves crotch, to drive two deformation pinch rollers along the side vertical with pipe fitting axis
Dynamic displacement is realized to pressure is applied.With the movement of pipe fitting, deformation pinch roller generates dynamic under the drive of hydraulic cylinder and continuously may be used
Command displacement realizes that pipe fitting generates different predeformation in axially distinct section；At the same time moving crotch can dynamically connect
Continuous controlling rotary realizes the pipe fitting predeformation different degrees of in the different radial generations in section, dual irregular pre- to realize
Deformation.
Claims (9)
1. a kind of dual irregular pre-deformation device of precision bend pipe, it is characterized in that：Including the identical predeformation group of two groups of structures
Part, two groups of predeformation components, which are arranged in pipe fitting (8), needs both sides at flexural deformation, and every group of predeformation component includes hydraulic cylinder
(1), crotch (2), deformation pinch roller (3), shaft (4) and taper roll bearing (7) are moved；The removable crotch (2) is U
The U-shaped structure middle part outside of shape structure, removable crotch (2) is connect with the output rod of hydraulic cylinder (1), and deformation pinch roller (3) is coaxial
It is fixedly set in shaft (4) outside, the both ends of shaft (4) are articulated with the U of removable crotch (2) by taper roll bearing (7)
Shape structure both ends branch, deformation pinch roller (3) contact pipe fitting (8) surface；It is driven and is moved on crotch (2) by hydraulic cylinder (1) driving
Deformation pinch roller (3) to pipe fitting (8) surface apply predeformation pressure.
2. a kind of dual irregular pre-deformation device of accurate bend pipe according to claim 1, it is characterized in that：The change
The sleeve (6) for axially position is set in shaft (4) between shape pinch roller (3) and taper roll bearing (7).
3. a kind of dual irregular pre-deformation device of accurate bend pipe according to claim 1, it is characterized in that：Described turns
The bearing (ball) cover (5) for shaft (4) axial limiting is equipped at the both ends of axis (4), bearing (ball) cover (5) is bolted installation
In in the U-shaped structure both ends branch of removable crotch (2).
4. a kind of dual irregular pre-deformation device of accurate bend pipe according to claim 1, it is characterized in that：The change
Shape pinch roller (3) is U-lag wheel, and the peripheral surface of U-lag wheel is the surface of revolution formed by indent circular arc, and the diameter of interior concave arc is more than
The diameter of pipe fitting (8).
5. a kind of dual irregular pre-deformation device of accurate bend pipe according to claim 1, it is characterized in that：Two groups become in advance
Shape component, which is asymmetricly arranged in pipe fitting (8), needs the both sides of same circumference at flexural deformation, and in two groups of predeformation components
The force direction that two deformation pinch rollers (1) press to pipe fitting (8) is arranged with pipe fitting (8) by the equal out of plumb of plane where curved direction, is led to
It crosses the asymmetric force that two deformation pinch rollers (1) apply to pipe fitting (8) and realizes irregular cross-section radial predeformation.
6. a kind of dual irregular pre-deformation device of accurate bend pipe according to claim 1, it is characterized in that：Two groups become in advance
Shape component is arranged symmetrically with pipe fitting (8) by plane where curved direction.
7. a kind of dual irregular pre-deformation device of accurate bend pipe according to claim 1, it is characterized in that：Two groups become in advance
Shape component integrally can need to carry out rotating/translating on the sectional plane at flexural deformation and adjust deformation pinch roller (1) in pipe fitting (8)
Position, and then adjust the force direction that presses to pipe fitting (8) of deformation pinch roller (1) and power size in predeformation component.
8. a kind of dual irregular predeformation method of accurate bend pipe applied to any described devices of claim 1-7, special
Sign is：
First, upper two groups of predeformation components are loaded before pipe fitting (8) carries out flexural deformation processing and carries out pre-treatment, specific side
Formula is：Two groups of predeformation components, which are asymmetricly arranged in pipe fitting (8), needs the both sides of circumference at flexural deformation central cross-section, two groups
Two deformation pinch rollers (1) in predeformation component need the inside of flexural deformation to synchronize inclination arrangement to pipe fitting (8) so that two
The force direction that deformation pinch roller (1) applies to pipe fitting (8) is with pipe fitting (8) by plane where curved direction symmetrically and with pipe fitting (8) by curved
The equal out of plumb of plane where direction, two deformation pinch rollers (1) apply identical predeformation pressure to pipe fitting (8) surface so that pipe fitting
(8) flexural deformation central cross-section is needed to become irregular ellipse；
Then, lower two groups of predeformation components are unloaded, pipe fitting (8) is subjected to flexural deformation.
9. a kind of dual irregular predeformation method of accurate bend pipe according to claim 8, it is characterized in that：It is described not
The tip of regular ellipse and blunt nosed line are located at pipe fitting (8) by plane where curved direction, the blunt nosed direction of irregular ellipse
Pipe fitting (8) needs the outside of flexural deformation, and the tip of irregular ellipse needs the inside of flexural deformation towards pipe fitting (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810178830.1A CN108480470B (en) | 2018-03-05 | 2018-03-05 | A kind of dual irregular pre-deformation device and method of precision bend pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810178830.1A CN108480470B (en) | 2018-03-05 | 2018-03-05 | A kind of dual irregular pre-deformation device and method of precision bend pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108480470A true CN108480470A (en) | 2018-09-04 |
| CN108480470B CN108480470B (en) | 2019-03-05 |
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ID=63341658
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810178830.1A Active CN108480470B (en) | 2018-03-05 | 2018-03-05 | A kind of dual irregular pre-deformation device and method of precision bend pipe |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112570557A (en) * | 2020-10-29 | 2021-03-30 | 无锡华利达金属制品有限公司 | Cold press mechanism of exhaust hose telescopic joint |
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|---|---|---|---|---|
| GB783961A (en) * | 1953-07-17 | 1957-10-02 | Andre Huet | Improvements in and relating to methods of and apparatus for bending tubes |
| DE971026C (en) * | 1951-02-13 | 1958-11-27 | Andre Huet | Process for producing a non-corrugated curvature on a straight, cylindrical pipe |
| JPH03169434A (en) * | 1989-11-29 | 1991-07-23 | Hitachi Ltd | Bending apparatus and method for pipe material |
| CN201537658U (en) * | 2009-11-06 | 2010-08-04 | 长治市钜星锻压机械设备制造有限公司 | Anti-transforming bending mold for shape bending machine |
| CN105473249A (en) * | 2013-12-04 | 2016-04-06 | 电装空调管路有限公司 | Processing unit and processing device |
| CN106270050A (en) * | 2016-08-30 | 2017-01-04 | 宁波市鄞州新华仪表电机配件厂 | Bending machine |
| CN206122429U (en) * | 2016-11-02 | 2017-04-26 | 天津航天机电设备研究所 | Simple and easy bending device of thin -wall tube |
-
2018
- 2018-03-05 CN CN201810178830.1A patent/CN108480470B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE971026C (en) * | 1951-02-13 | 1958-11-27 | Andre Huet | Process for producing a non-corrugated curvature on a straight, cylindrical pipe |
| GB783961A (en) * | 1953-07-17 | 1957-10-02 | Andre Huet | Improvements in and relating to methods of and apparatus for bending tubes |
| JPH03169434A (en) * | 1989-11-29 | 1991-07-23 | Hitachi Ltd | Bending apparatus and method for pipe material |
| CN201537658U (en) * | 2009-11-06 | 2010-08-04 | 长治市钜星锻压机械设备制造有限公司 | Anti-transforming bending mold for shape bending machine |
| CN105473249A (en) * | 2013-12-04 | 2016-04-06 | 电装空调管路有限公司 | Processing unit and processing device |
| CN106270050A (en) * | 2016-08-30 | 2017-01-04 | 宁波市鄞州新华仪表电机配件厂 | Bending machine |
| CN206122429U (en) * | 2016-11-02 | 2017-04-26 | 天津航天机电设备研究所 | Simple and easy bending device of thin -wall tube |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112570557A (en) * | 2020-10-29 | 2021-03-30 | 无锡华利达金属制品有限公司 | Cold press mechanism of exhaust hose telescopic joint |
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| CN108480470B (en) | 2019-03-05 |
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