CN106475748A - A kind of curved round forming technology of square tube and frock - Google Patents
A kind of curved round forming technology of square tube and frock Download PDFInfo
- Publication number
- CN106475748A CN106475748A CN201611195932.1A CN201611195932A CN106475748A CN 106475748 A CN106475748 A CN 106475748A CN 201611195932 A CN201611195932 A CN 201611195932A CN 106475748 A CN106475748 A CN 106475748A
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- square tube
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- circle
- round
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- 238000005516 engineering process Methods 0.000 title claims abstract description 14
- 238000005452 bending Methods 0.000 claims abstract description 25
- 239000000758 substrate Substances 0.000 claims abstract description 21
- 238000004519 manufacturing process Methods 0.000 claims abstract description 7
- 238000007493 shaping process Methods 0.000 claims abstract description 6
- 238000003466 welding Methods 0.000 claims abstract description 5
- 238000010438 heat treatment Methods 0.000 claims description 10
- 230000007547 defect Effects 0.000 claims description 4
- 238000005422 blasting Methods 0.000 claims description 3
- 239000004576 sand Substances 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 230000001360 synchronised effect Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 4
- 230000008030 elimination Effects 0.000 abstract 1
- 238000003379 elimination reaction Methods 0.000 abstract 1
- 238000005498 polishing Methods 0.000 abstract 1
- 230000001737 promoting effect Effects 0.000 abstract 1
- 238000009826 distribution Methods 0.000 description 5
- 230000007935 neutral effect Effects 0.000 description 4
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000037237 body shape Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
-
- 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
- B21D3/00—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
Abstract
The invention belongs to mechanical manufacturing field, the curved round forming technology of specifically a kind of square tube and frock.Including：(1) Fixture Design makes：Special tooling is designed and produced according to the curved round dimensional requirement of square tube, the frock by the substrate (1) as reference data plane and if the same face is fixed thereon girth circle baffle plate (2) and some thrustors (3) constitute；The outer line for enclosing round baffle plate (2) is overlapped with the inner circle of workpiece, and thrustor (3) is required external force along the cylindrical setting of workpiece to provide square tube bending；(2) workpiece pre-bending；(3) workpiece is fixed；(4) workpiece heat straightening；(5) surplus cuts off：Square tube surplus is cut off, circle body shaping after welding point, polishing welding seams are smooth；Implement the present invention and the index such as the circularity of circle body, flatness and presentation quality, elimination forming residual stress, raising product structure intensity, the curved round forming technique low cost of the more existing square tube of the present invention, high precision after the curved circle of square tube shapes can be effectively improved, be suitable for promoting.
Description
Technical field
The invention belongs to machinery manufacturing technology field, the curved round forming technology of specifically a kind of square tube and frock.
Background technology
The curved circle of square tube is widely used in machine industry.Steelframe fixed by wind power generating set matched structural kuppe,
Its primary structure is the curved circle of 40mm × 40mm square tube, and after circle body shaping, diameter reaches 3m, it is desirable to deviation from circular from≤± 1mm, plane
Degree error≤1mm.
Generally with bending machine by curved for square tube circle in prior art, after weld, circle body shapes.Which has the disadvantage the curved circle of square tube
Surface scratches unavoidably afterwards, necessarily wrinkles on the inside of circular arc, affects mechanical performance and the presentation quality of product；Due to the curved circle of this square tube
Elastic recoil inevitable, then after applying external force weld, circle body circularity and flatness are unable to reach required precision.
Therefore, in big machinery equipment manufacturing field, in the urgent need to a kind of low cost that can overcome disadvantages mentioned above, in high precision
The curved round forming technology of square tube.
Content of the invention
It is an object of the invention to overcoming the defect that prior art is present, and reach following technical requirements：
(1) circle body after square tube bending forming, be with accurate circularity and flatness；
(2) bulk article possesses uniformity, can achieve 100% and exchange during assembling；
(3) product appearance quality is good, and surface nothing is scratched and wrinkled with the inside of circular arc.
Inventor is constantly explored, solves finally above-mentioned technical barrier by studying repeatedly and putting into practice.
The present invention provide technical scheme be：
A kind of curved round forming technology of inexpensive, high-precision square tube, implements as follows：
(1) Fixture Design makes：As shown in Figure 1, special tooling is designed and produced according to the dimensional requirement of square tube curved circle, the work
Dress by substrate (1), enclose round baffle plate (2), thrustor (3) and constitute；Substrate (1) is used as reference data plane calibration workpiece planarization
Degree, substrate are the hot rolled plate of 40 50mm of thickness, and be fixedly connected with into circumference branch thereon encloses round baffle plate (2)；The circumference
Extension line formed circle with manufacture workpiece inner circle overlap；Thrustor (3) is provided with to provide along excircle of workpiece direction
Required external force when bending of square tube；Meanwhile, improve the stress distribution on square tube section, make neutral line（Note：Circular outer layer
Deformation is drawn high, in the inner part pressurized compression deformation, neutral line refers to indeformable aspect, be the Essential Terms in the field）Outer shifting, so as to
Reach the purpose for reducing tube wall thickness on the outside of square tube；
(2) workpiece pre-bending：Square tube is carried out pre-bending using bending machine, obtain 10 20% circular arc bigger than specified diameter；
Meanwhile, improve the stress distribution on square tube section, make to move outside neutral line, subtract so as to reach tube wall on the outside of minimizing square tube
The purpose of thin amount；
Thrustor (3) is wedge structure, ties according to processed circle body and constitutes circle distribution, easy to operate, structure reliability；Workpiece
Larger with circle body contact area, reduce local compression deformation；
(3) workpiece is fixed：The square tube circular arc of pre-bending is fixed on special tooling；When the curved circular diameter of workpiece is required compared with hour,
Grains of sand compacting is added in the good square tube of pre-bending, occurs inner side corrugation, the curved defect such as split when preventing from bending again；
(4) workpiece heat straightening：Using the substrate (1) of the special tooling as the benchmark for correcting circle body flatness, round baffle plate (2) is enclosed
Used as the mold for correcting circle body, the deformation according to circularity requirement, planarity requirements and circle body plane wave marks rectification model
Enclose, coordinate thrustor external force, using flame by the heating expansion of square tube circular arc, deformation, so that circle body is gradually shaped, be quickly cooled to
Normal temperature, workpiece obtain workpiece bows deflection after shrinking；Reversely corrected with method when workpiece deflection is excessive again, until it reaches circle
Degree face degree requirement of will demanding for peace is dropped back out frock；
(5) surplus cuts off：Square tube surplus cuts off, and circle body shaping after weld, weld grinding are smooth；
(6) Shot Blasting：Residual stress in workpiece is eliminated, increases surface strength；
Wherein step (2) can be carried out prior to step (1), also synchronous can be carried out；
Micro adjustment is carried out by repeat the above steps (1) step (5), satisfactory precision and intensity can be reached, batch
Amount good product consistency, can achieve 100% and exchanges during assembling；Product appearance quality is good, and surface nothing is scratched and wrinkled with the inside of circular arc.
The also included optimization of the present invention or/and improvement have：
One of preferred version, the heating and temperature control in step (4) in workpiece heat straightening is at 500 600 DEG C；
The two of preferred version, the mode of heating in step (4) in workpiece heat straightening are heated for oxy arc；
The three of preferred version, when the deflection in step (4) is larger, using water-spraying control mode；
The beneficial effect that technical solution of the present invention is brought：
The present invention effectively solves the technical requirements such as the circularity of circle body, flatness and presentation quality after the curved circle of square tube shapes, and
Internal residual stress in process is eliminated, improves the structural strength of product；
Prove through production practices, fully meet customer requirement, the curved round product supply of material more than 200 of only 2015 large-scale square tubes covers, and realizes
240,000 yuan of income from sales.
Technical scheme is described in detail with reference to the accompanying drawings and examples.
Description of the drawings
Accompanying drawing 1 is the curved round fixture for forming structural representation of square tube of the present invention.
In Fig. 1, round baffle plate, 3 thrustors are enclosed in 1 substrate, 2.
Specific embodiment
For making those skilled in the art more fully understand technical scheme, the present invention is made with reference to embodiment
Further describe in detail.
In an embodiment, for the ease of description, the description of each part relative position relation is the cloth according to Figure of description 1
Figure mode being described, such as：The position relationship of upper and lower, left and right etc. is come really according to the Butut direction of Figure of description 1
Fixed.
Embodiment 1：
Make steelframe before 2.0MW wind power generating set matched structural kuppe.
Before 2.0MW wind power generating set matched structural kuppe, steelframe primary structure is the curved circle of 40mm × 40mm square tube,
After circle body shaping, diameter reaches 3m, it is desirable to deviation from circular from≤± 1mm, flatness error≤1mm.
Implement as follows：
(1) Fixture Design makes：As shown in Figure 1, special tooling is designed and produced according to the dimensional requirement of square tube curved circle, the work
Dress by substrate (1), enclose round baffle plate (2), thrustor (3) and constitute；Substrate (1) is used as reference data plane calibration workpiece planarization
Degree, substrate are the hot rolled plate of 40 50mm of thickness, and be fixedly connected with into circumference branch thereon encloses round baffle plate (2), encloses round baffle plate
(2) depending on spacing is with reference to diameter of work and operating space；The circle that the extension line of the circumference is formed and the inner circle for manufacturing workpiece
Overlap；Thrustor (3) is provided with to provide required external force when square tube bends along excircle of workpiece direction；Meanwhile, improve square tube
Stress distribution on section, makes to move outside neutral line, so as to reach the purpose for reducing tube wall thickness on the outside of square tube；
Diameter of work is big, and the spacing for enclosing round baffle plate just can be more relatively large, and theory says that spacing is the smaller the better, more connects after surrounding circle
Nearly proper circle；The easy to operate problem of consideration, thrustor (3) are wedge structure, tie according to processed circle body and constitute circle distribution,
Easy to operate, structure reliability；Workpiece is larger with circle body contact area, reduces local compression deformation；
(2) workpiece pre-bending：Square tube is carried out pre-bending using bending machine, obtain 10 20% circular arc bigger than specified diameter；During pre-bending
Arc diameter is larger, and square tube bending resistance will be relatively smaller, lacks so as to reduce corrugation etc. on the inside of surface tear and circular arc
Fall into；
(3) workpiece is fixed：The square tube circular arc of pre-bending is fixed on special tooling；When the curved circular diameter of workpiece is required compared with hour,
Grains of sand compacting is added in the good square tube of pre-bending, occurs inner side corrugation, the curved defect such as split when preventing from bending again；
(4) workpiece heat straightening：Using the substrate (1) of the special tooling as the benchmark for correcting circle body flatness, round baffle plate (2) is enclosed
Used as the mold for correcting circle body, the deformation according to circularity requirement, planarity requirements and circle body plane wave marks rectification model
Enclose, coordinate thrustor external force, using flame by the heating expansion of square tube circular arc, deformation, so that circle body is gradually shaped, be quickly cooled to
Normal temperature, workpiece obtain workpiece bows deflection after shrinking；Reversely corrected with method when workpiece deflection is excessive again, until it reaches circle
Degree face degree requirement of will demanding for peace is dropped back out frock；
(5) surplus cuts off：Square tube surplus cuts off, and circle body shaping after weld, weld grinding are smooth；
(6) Shot Blasting：Residual stress in workpiece is eliminated, increases surface strength；
Wherein step (2) can be carried out prior to step (1), also synchronous can be carried out；
Repeat the above steps (1) step (5) carries out micro adjustment, can reach satisfactory precision and intensity, and batch is produced
Product uniformity is good, can achieve 100% and exchange during assembling；Product appearance quality is good, and surface nothing is scratched and wrinkled with the inside of circular arc.
Embodiment 2：
Make steelframe after 2.0MW wind power generating set matched structural kuppe.
After 2.0MW wind power generating set matched structural kuppe, steelframe is by the circle body constituted for 3 arc sections, main material
Expect for 40mm × 40mm square tube, spliced circle body diameter reaches 4m, it is desirable to overall deviation from circular from≤± 1mm, flatness error
≤1mm.
Operate according to the step of embodiment 1, difference is：
Substrate (1) is welding with being fixedly connected between round baffle plate (2) is enclosed；
Being fixedly connected between substrate (1) and thrustor (3) is bolt connection；
Described thrustor (3) are wedge structure, convenient operation；
The substrate is the hot rolled plate of 40 50mm of thickness；
Heating and temperature control in step (4) in workpiece heat straightening is at 500 600 DEG C；
Mode of heating in step (4) in workpiece heat straightening is heated for oxy arc；
When deflection in step (4) is larger, using water-spraying control mode；
Repeat the above steps (1) step (5) carries out micro adjustment, can reach satisfactory precision and intensity, and batch is produced
Product uniformity is good, can achieve 100% and exchange during assembling；Product appearance quality is good, and surface nothing is scratched and wrinkled with the inside of circular arc.
It is understood that the above example principle being intended to be merely illustrative of the present and the exemplary embodiment party for adopting
Formula, but the invention is not limited in this, can technology according to the present invention scheme determine specific embodiment party with actual conditions
Formula.For those skilled in the art, without departing from the spirit and substance in the present invention, can make
Various modifications and improvement, these modifications of increase and improvement are also considered as protection scope of the present invention.
Claims (8)
1. the curved round forming technology of a kind of square tube, it is characterised in that comprise the steps：
(1) Fixture Design makes：Design and produce according to the dimensional requirement of the curved circle of square tube according to the dimensional requirement of the curved circle of square tube special
Frock, frock is by substrate (1) and if the same face is fixedly connected thereon girth circle baffle plate (2) and some thrustors (3) group
Become；Substrate (1) is enclosed round baffle plate (2) and becomes circumference branch as reference data plane, the circle that the extension line of the circumference is formed with
The inner circle of manufacture workpiece overlaps, depending on enclosing round baffle plate (2) spacing with reference to diameter of work and operating space；Thrustor (3) is along work
The outer circular direction of part is arranged to provide required external force when square tube bends；
(2) workpiece pre-bending：Square tube is carried out pre-bending using bending machine, obtain 10 20% circular arc bigger than specified diameter；
(3) workpiece is fixed：The square tube circular arc of pre-bending is fixed on special tooling；When the curved circular diameter of workpiece is required compared with hour,
Grains of sand compacting is added in the good square tube of pre-bending, defect occurs when preventing from bending again；
(4) workpiece heat straightening：Using the substrate (1) of special tooling as the benchmark for correcting circle body flatness, round baffle plate (2) conduct is enclosed
The mold of circle body is corrected, the deformation according to circularity requirement, planarity requirements and circle body plane wave marks levelling thickness range, joins
Thrustor external force is closed, using flame by the heating expansion of square tube circular arc, deformation, so that circle body is gradually shaped, normal temperature is quickly cooled to,
Workpiece obtains workpiece bows deflection after shrinking, and reaches requirement and drops back out frock；
(5) surplus cuts off：Square tube surplus cuts off, and circle body shaping after weld, weld grinding are smooth；
(6) Shot Blasting：Residual stress in workpiece is eliminated, increases surface strength；
Wherein step (2) can be carried out prior to step (1), also synchronous can be carried out；
Step (1) step (5) can repeat as needed.
2. the curved round forming technology of a kind of square tube according to claim 1, it is characterised in that in step (4) workpiece heat straightening
Heating and temperature control at 500 600 DEG C.
3. the curved round forming technology of a kind of square tube according to claim 1, it is characterised in that in (4) the workpiece heat straightening
Mode of heating be oxy arc heating.
4. a kind of curved round forming technology of square tube according to claim 1, it is characterised in that the deformation in step (4)
When measuring larger, using water-spraying control mode.
5. a kind of curved round fixture for forming of square tube of the curved round forming technology of square tube described in claim 1 is used for, it is characterised in that described
What frock was fixedly connected by substrate (1) and thereon the same face enclose round baffle plate (2) and thrustor (3) constitutes；Substrate (1) conduct
Reference data plane, encloses round baffle plate (2) and becomes circumference branch, and thrustor (3) arranges curved to provide square tube along excircle of workpiece direction
Required external force when bent.
6. the curved round fixture for forming of a kind of square tube according to claim 5, it is characterised in that substrate (1) with enclose round gear
Being fixedly connected between plate (2) is welding or bolt connection.
7. the curved round fixture for forming of a kind of square tube according to claim 5, it is characterised in that substrate (1) is filled with pushing tow
It is welding or bolt connection to put being fixedly connected between (3).
8. the curved round fixture for forming of a kind of square tube according to claim 5, it is characterised in that described substrate (1) is thickness
The hot rolled plate of 40 50mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611195932.1A CN106475748B (en) | 2016-12-22 | 2016-12-22 | A kind of curved round forming technology of square tube and tooling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611195932.1A CN106475748B (en) | 2016-12-22 | 2016-12-22 | A kind of curved round forming technology of square tube and tooling |
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| Publication Number | Publication Date |
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| CN106475748A true CN106475748A (en) | 2017-03-08 |
| CN106475748B CN106475748B (en) | 2018-10-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201611195932.1A Expired - Fee Related CN106475748B (en) | 2016-12-22 | 2016-12-22 | A kind of curved round forming technology of square tube and tooling |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107497882A (en) * | 2017-09-22 | 2017-12-22 | 浙江春风动力股份有限公司 | A kind of square tube bending method and a kind of preformed curvature square tube |
| CN112329164A (en) * | 2020-10-27 | 2021-02-05 | 厦门理工学院 | Modeling method, device and equipment for square tube beam rebound curvature and storage medium |
| CN112329165A (en) * | 2020-10-27 | 2021-02-05 | 厦门理工学院 | Modeling method, device and equipment for bending and rebounding square tube of wheel cover framework |
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| CN2131625Y (en) * | 1991-06-27 | 1993-05-05 | 水利电力部第十二工程局施工科学研究所 | Arc bending apparatus for thin tubes |
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| CN202741524U (en) * | 2012-09-07 | 2013-02-20 | 江苏淮海车辆制造有限公司 | Multi-radian bent pipe forming device |
| CN203972549U (en) * | 2014-06-30 | 2014-12-03 | 浙江吉利控股集团有限公司 | A kind of steel pipe bent pipe tooling |
| CN204262108U (en) * | 2014-09-23 | 2015-04-15 | 上海奥林汽车安全系统有限公司 | A kind of device for bending square tube |
| CN205732402U (en) * | 2016-05-17 | 2016-11-30 | 厦门美驰汽配工业有限公司 | A kind of Bus Frame angle pipe equipment |
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| CN2131625Y (en) * | 1991-06-27 | 1993-05-05 | 水利电力部第十二工程局施工科学研究所 | Arc bending apparatus for thin tubes |
| RU2378072C1 (en) * | 2008-09-29 | 2010-01-10 | Михаил Петрович Казенкин | Bending method of shaped square pipes |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107497882A (en) * | 2017-09-22 | 2017-12-22 | 浙江春风动力股份有限公司 | A kind of square tube bending method and a kind of preformed curvature square tube |
| CN112329164A (en) * | 2020-10-27 | 2021-02-05 | 厦门理工学院 | Modeling method, device and equipment for square tube beam rebound curvature and storage medium |
| CN112329165A (en) * | 2020-10-27 | 2021-02-05 | 厦门理工学院 | Modeling method, device and equipment for bending and rebounding square tube of wheel cover framework |
| CN112329165B (en) * | 2020-10-27 | 2022-06-14 | 厦门理工学院 | Modeling method, device and equipment for bending and rebounding square tube of wheel cover framework |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106475748B (en) | 2018-10-02 |
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