CN108480470B - 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
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- CN108480470B CN108480470B CN201810178830.1A CN201810178830A CN108480470B CN 108480470 B CN108480470 B CN 108480470B CN 201810178830 A CN201810178830 A CN 201810178830A CN 108480470 B CN108480470 B CN 108480470B
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- Prior art keywords
- pipe fitting
- deformation
- 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
Abstract
The invention discloses the dual irregular pre-deformation devices and method of a kind of accurate bend pipe.Two groups of predeformation components, which are arranged in pipe fitting, needs two sides at bending 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 pass through the U-shaped structure both ends branch that tapered roller bearing is articulated with removable crotch, and deformation pinch roller contacts tube surface；The deformation pinch roller on removable 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 a possibility that fold, rupture occur for tube wall during bending machine bend pipe.
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 technique
With the fast development of China's manufacturing industry, the demand of various material bend pipes is also being quicklyd increase.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 will lead to sectional area and become smaller, and
This each radial deformation degree of the distortion in axially distinct section be it is different, largely effect 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.
Summary of the invention
According to the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is providing 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 promotes accurate bending quality so that pipe fitting bending deformation is accurate.
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 bending deformation
Two sides, every group of predeformation component includes hydraulic cylinder, removable crotch, deformation pinch roller, shaft and tapered roller 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 pass through the U-shaped structure two that tapered roller bearing is articulated with removable crotch
Branch is held, deformation pinch roller contacts 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 tapered roller 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 tapered roller 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 outer peripheral surface of U-lag wheel is the surface of revolution formed by indent circular arc, indent
The diameter of circular arc is greater than the diameter of pipe fitting.
Two groups of predeformation components, which are asymmetricly arranged in pipe fitting with the center of pipe fitting, needs two of same circumference at bending deformation
Side, and power direction and the pipe fitting plane where by curved direction that two deformation pinch rollers in two groups of predeformation components press to pipe fitting
Equal out of plumb arrangement, realizes irregular cross-section radial predeformation to the asymmetric force that pipe fitting presses by two deformation pinch rollers.
Two groups of predeformation components are arranged symmetrically with pipe fitting plane where by curved direction.
Two groups of predeformation components can integrally pipe fitting need on the sectional plane at bending deformation carry out rotation and translation and
The position of adjustment deformation pinch roller, and then power direction and power size that the deformation pinch roller in predeformation component presses to pipe fitting are adjusted,
What wherein power direction changed is the power that the deformation pinch roller in predeformation component presses to pipe fitting and pipe fitting plane where by curved direction
Between angle.
Two, a kind of dual irregular predeformation method of accurate bend pipe:
It is handled before pipe fitting carries out bending 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 with the center of pipe fitting, to be needed at bending deformation central cross-section
The two sides of circumference, two deformation pinch rollers in two groups of predeformation components need the synchronous inclination cloth in outside of bending deformation to pipe fitting
It sets, so that power direction and the pipe fitting plane where by curved direction that two deformation pinch rollers apply to pipe fitting are symmetrically and with pipe fitting by curved side
To the equal out of plumb of place plane, two deformation pinch rollers apply identical predeformation pressure to tube surface, so that pipe fitting need to be bent change
Shape central cross-section becomes irregular ellipse；
Then bending deformation processing is carried out to pipe fitting again.
The irregular elliptical tip and blunt nosed line are located at pipe fitting plane where by curved direction, irregular elliptical
Tip needs the inside of bending deformation towards pipe fitting, the irregular elliptical blunt nosed outside that bending deformation is needed towards pipe fitting.
The present invention can be played using removable crotch and adjust two changes according to pipe fitting material, pipe fitting radius, bend pipe precision
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, hydraulic cylinder connects external servo hydraulic system, and removable crotch is threaded with hydraulic cylinder.
Hydraulic cylinder with servo-system can realize deformation pinch roller different predeformation according to 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 pre-deformation device of the 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 in the part center of circle and angle 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 that the mechanics principle that predeformation generates, predeformation pinch roller replace tradition and pipe using small curvature circular arc
The identical circular arc of diameter, ensure that the surplus of predeformation.Small curvature circular arc refers to that the diameter of the interior concave arc of deformation pinch roller is greater 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 bending deformation formation bend pipe using straight round tube as pipe fitting, the outboard tube of pipe fitting
The movement of wall tension, the outside wall compression movement of pipe fitting, the lateral surface of pipe fitting often ruptures due to being stretched, pipe fitting it is interior
Often there is fold due to being pressurized in side, and finally deforms the tube section of flexural center, is formed irregular
Ellipse.
The pipe fitting of straight round tube is carried out predeformation by device and method proposed by the present invention before bending deformation, at place to be bent
Predeformation is at irregular oval tube section corresponding with final bend pipe result, then carries out bending deformation, so that 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 round tube.
Beneficial effects of the present invention:
The present invention can connect servo hydraulic system, carry out accurately Bit andits control by servo-system, realize different cut
Face generates different degrees of predeformation.
Different cross section is not identical in cross section distortion axially and radially during the present invention considers pipe fitting bend pipe, has 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
A possibility that outer wall ruptures.
Detailed description of the invention
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 in Fig. 2 at A under partial enlargement horizontal view angle after bend pipe predeformation.
Fig. 4 is the cross-section radial deformation schematic diagram in Fig. 3 at B-section after bend pipe predeformation.
Fig. 5 is the cross-section radial deformation schematic diagram in Fig. 3 at the section C after bend pipe predeformation.
Fig. 6 is the cross-section radial deformation schematic diagram in Fig. 3 at the section D after bend pipe predeformation.
Fig. 7 is the final cross sectional shape that the section D shown in Fig. 6 after pre-treatment obtains 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 embodiment
Present invention will be further explained below with reference to the attached drawings and examples.
As shown in Figure 1, the present invention specific implementation include the identical predeformation component of two groups of structures, two groups of predeformation components with
The center of pipe fitting 8, which is asymmetricly arranged in pipe fitting 8, needs two sides at bending deformation, and every group of predeformation component includes hydraulic cylinder
1, crotch 2, deformation pinch roller 3, shaft 4 and tapered roller bearing 7 are moved；Removable crotch 2 is U-shaped structure, moves crotch 2
U-shaped structure in the middle part of outside connect with the output rod of hydraulic cylinder 1, deform pinch roller 3 be coaxially fixedly set in outside shaft 4, shaft 4
Both ends pass through the U-shaped structure both ends branch that tapered roller bearing 7 is articulated with removable crotch 2, and deformation pinch roller 3 contacts pipe fitting 8
Surface；It is set with sleeve 6 for axially position in shaft 4 between deformation pinch roller 3 and tapered roller bearing 7, the two of shaft 4
The bearing (ball) cover 5 for 4 axial limiting of shaft is equipped at end, bearing (ball) cover 5, which is bolted, is installed on removable crotch 2
In the branch of U-shaped structure both ends.
The deformation pinch roller 3 on removable 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 outer peripheral surface of U-lag wheel is the surface of revolution formed by indent circular arc, interior concave arc
Diameter is greater 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 bending deformation carry out rotation and translation and
The position of adjustment deformation pinch roller 1, and then adjust the power direction that presses to pipe fitting 8 of deformation pinch roller 1 in predeformation component and power is big
It is small., can be fixed by one of deformation pinch roller 1 in two predeformation components in specific implementation, another deforms pinch roller 1 to pipe
The power direction and power size that part 8 presses are adjusted by position of the deformation pinch roller 1 in the tube section of pipe fitting 8 to be adjusted.
In same section since different radial cross section distortions are not identical, 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 bending deformation processing, as depicted in figs. 1 and 2, by two groups of predeformation components in pipe fitting 8
The heart, which is asymmetricly arranged in pipe fitting 8, needs the two sides of circumference at bending deformation central cross-section, two changes in two groups of predeformation components
Shape pinch roller 1 needs the outside of bending deformation is synchronous to be in tilted layout to pipe fitting 8, so that the power that two deformation pinch rollers 1 apply to pipe fitting 8
Direction is with the plane where by curved direction of pipe fitting 8 symmetrically and with pipe fitting 8 by the curved direction place equal out of plumb of plane.
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 after pre-treatment pipe fitting outer wall along axial true form.
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 the plane where by curved direction of pipe fitting 8, and the tip of irregular ellipse needs the inside of bending deformation towards pipe fitting 8, no
The blunt nosed outside that bending deformation is needed towards pipe fitting 8 of regular ellipse.Fig. 4 is the cross sectional shape in Fig. 3 after B-section predeformation,
Fig. 5 is the cross sectional shape in Fig. 3 after the predeformation of the section C, and Fig. 6 is the cross sectional shape in Fig. 3 after the predeformation of the section D, the point in figure
Setting-out refers to actual cross-section shape of the section after pre-treatment.
Then bending 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 section D after pre-treatment obtains after bend pipe process, wherein dotted line is after bending deformation
The final shape in section.
Thus the present invention is finally held round the section of the pipe fitting 8 after bending deformation still, the pipe after bending 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 bending deformation device adjacent
Station, predeformation process are carried out after predeformation of the invention again immediately before the progress of bending deformation process by pre-deformation device
Handle bending deformation.
In specific implementation, predeformation is to be become as bending deformation while transporting pipe fitting and advancing to the present invention
Shape process connects removable crotch by hydraulic cylinder, 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；Moving crotch at the same time can dynamically connect
Continuous controlling rotary realizes the pipe fitting predeformation different degrees of in the different radial generations in section, to realize dual irregular pre-
Deformation.
Claims (7)
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 two sides at bending deformation, and every group of predeformation component includes hydraulic cylinder
(1), crotch (2), deformation pinch roller (3), shaft (4) and tapered roller 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) pass through the U that tapered roller bearing (7) is articulated with removable crotch (2)
Shape structure both ends branch, deformation pinch roller (3) contact pipe fitting (8) surface；It is driven on removable crotch (2) by hydraulic cylinder (1) driving
Deformation pinch roller (3) to pipe fitting (8) surface apply predeformation pressure；
Two groups of predeformation components, which are asymmetricly arranged in pipe fitting (8) with the center of pipe fitting (8), needs same circumference at bending deformation
Two sides, and the power direction that presses to pipe fitting (8) of two deformation pinch rollers (1) in two groups of predeformation components with pipe fitting (8) by curved
The equal out of plumb arrangement of plane where direction, is realized irregular by the asymmetric force that two deformation pinch rollers (1) apply to pipe fitting (8)
Cross-section radial predeformation.
2. the dual irregular pre-deformation device of a kind 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 tapered roller bearing (7).
3. the dual irregular pre-deformation device of a kind 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. the dual irregular pre-deformation device of a kind 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 outer peripheral surface of U-lag wheel is the surface of revolution formed by indent circular arc, and the diameter of interior concave arc is greater than
The diameter of pipe fitting (8).
5. the dual irregular pre-deformation device of a kind 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) plane where by curved direction.
6. the dual irregular pre-deformation device of a kind 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 bending deformation and adjust deformation pinch roller (1) in pipe fitting (8)
Position, and then adjust the power direction that presses to pipe fitting (8) of deformation pinch roller (1) and power size in predeformation component.
7. it is applied to a kind of dual irregular predeformation method of accurate bend pipe of any described device of claim 1-6, it is special
Sign is:
Firstly, loading upper two groups of predeformation components before pipe fitting (8) carry out bending deformation processing carries out pre-treatment, specific side
Formula is: two groups of predeformation components, which are asymmetricly arranged in pipe fitting (8) with the center of pipe fitting (8), to be needed at bending deformation central cross-section
The two sides of circumference, two deformation pinch rollers (1) in two groups of predeformation components need to synchronize on the inside of bending deformation to pipe fitting (8) to be inclined
Tiltedly arrangement, so that two deformation pinch rollers (1) are symmetrical with pipe fitting (8) plane where by curved direction to the power direction that pipe fitting (8) applies
And with pipe fitting (8) by the curved direction place equal out of plumb of plane, two deformation pinch rollers (1) apply identical pre- change to pipe fitting (8) surface
Shape pressure, so that pipe fitting (8) needs bending deformation central cross-section to become irregular ellipse；
Then, lower two groups of predeformation components are unloaded, pipe fitting (8) are subjected to bending deformation；
The tip and blunt nosed line of the irregular ellipse are located at pipe fitting (8) plane where by curved direction, irregular oval
The tip in the blunt nosed outside that bending deformation is needed towards pipe fitting (8) of shape, irregular ellipse needs bending deformation towards pipe fitting (8)
Inside.
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 |
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| Publication Number | Publication Date |
|---|---|
| CN108480470A CN108480470A (en) | 2018-09-04 |
| CN108480470B true CN108480470B (en) | 2019-03-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| 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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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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|---|---|
| CN108480470A (en) | 2018-09-04 |
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