CN107695151B - Improve the manufacturing process of large diameter thin wall pipe bending qualification rate in a kind of transfer deformed area - Google Patents
Improve the manufacturing process of large diameter thin wall pipe bending qualification rate in a kind of transfer deformed area Download PDFInfo
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- CN107695151B CN107695151B CN201711076801.6A CN201711076801A CN107695151B CN 107695151 B CN107695151 B CN 107695151B CN 201711076801 A CN201711076801 A CN 201711076801A CN 107695151 B CN107695151 B CN 107695151B
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- large diameter
- thin wall
- wall pipe
- diameter thin
- bending
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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
- B21D9/00—Bending tubes using mandrels or the like
- B21D9/01—Bending tubes using mandrels or the like the mandrel being flexible and engaging the entire tube length
-
- 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
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/16—Heating or cooling
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
Abstract
The present invention improves a kind of transfer deformed area the manufacturing process of large diameter thin wall pipe bending qualification rate, belongs to accurate sheet metal processing field, is suitable for bending dimensional accuracy, type face precision and the higher large diameter thin wall pipe of surface quality requirements.This method is as follows: 1. designing large diameter thin wall pipe bending mould；2. large diameter thin wall pipe makes annealing treatment；3. filler is added inside large diameter thin wall pipe；4. carrying out progressive bending forming using large diameter thin wall pipe bending mould；5. clearing up large diameter thin wall pipe inside stuffing.The present invention carries out progressive bending forming using large diameter thin wall pipe bending mould, solve the problems, such as that the qualification rate in large diameter thin wall pipe bending process is low, improve the surface quality of large diameter thin wall pipe, the generation to wrinkle in conventional method with cracking defect is effectively reduced, ensure that large diameter thin wall pipe dimensional accuracy, type face precision and surface quality requirements.
Description
Technical field
The invention belongs to accurate sheet metal processing fields, and it is qualified to be related to a kind of transfer deformed area raising large diameter thin wall pipe bending
The manufacturing process of rate, it is suitable for bending dimensional accuracy, type face precision and the higher large diameter thin wall pipe of surface quality requirements
Material.
Background technique
Pipe bending part has unique effect in terms of transmission gas and liquid-working-medium and as stress members, because
This occupies in fields such as Aeronautics and Astronautics, automobile, dynamic power machine, petrochemical industry, boiler, light industry, engineering machinery and metal structures
Increasingly consequence.In recent years, since the application to the more more and more urgent of structural member lightweight demand, pipe bending part is in
Quickly increase trend.Bending pipes differ markedly from plate, since it has the characteristics that hollow, thin-walled, bending forming processing
It is the defects of being easy to produce corrugation, drawing crack, cross sectional shape variation, and wall thickness can also change.Therefore its forming and machining method,
The application of power and moment of flexure, the defect of product and its Prevention method etc. all have very big difference with plate bending.Especially major diameter is thin
The bending of wall tube material is easily cracked corrugation, seriously affected the curved dimensional accuracy of large diameter thin wall pipe, type face precision and
Surface quality.
Summary of the invention
Technology of the invention solves the problems, such as: provide it is a kind of transfer deformed area improve large diameter thin wall pipe bending qualification rate at
Shape method, it can solve the low problem of qualification rate in large diameter thin wall pipe bending process, improves the table of large diameter thin wall pipe
Face quality effectively reduces the generation to wrinkle in conventional method with cracking defect, guarantees large diameter thin wall pipe dimensional accuracy, type face
Precision and surface quality requirements.
The technical problem to be solved in the present invention is realized by following scheme: a kind of transfer deformed area raising large diameter thin wall pipe
It is bent the manufacturing process of qualification rate, steps are as follows:
(1) according to the bending radius r for the large diameter thin wall pipe to be shaped, large diameter thin wall pipe bending mould ruler is determined
It is very little；
(2) large diameter thin wall pipe is made annealing treatment；(3) the large diameter thin wall pipe after step (2) annealing
Filler is added inside material；
(4) the large diameter thin wall pipe bending mould after determining size using step (1) carries out progressive bending forming, forming
It needs to shift deformed area in the process；
(5) inside stuffing of the large diameter thin wall pipe after cleanup step (4) forming, obtains large diameter thin wall pipe.
Further, large diameter thin wall pipe described in step (1) is preferably 5083 and 5A06 wrought aluminium alloy.
Further, large diameter thin wall pipe outside diameter d described in step (1) be 100mm~300mm, wall thickness t be 1mm~
10mm。
Further, large diameter thin wall pipe bent angle alpha described in step (1) is 1 °~45 °, and bending radius r is
200mm~1000mm.
Further, large diameter thin wall pipe bending mould type face arc radius R and large diameter thin wall described in step (1)
The bending radius r relationship of tubing is 0.5≤R/r≤1.Step makes annealing treatment large diameter thin wall pipe described in (2), moves back
Fiery temperature is 250 DEG C~350 DEG C, and soaking time is 0.5h~2h.
Further, filler is added described in step (3) inside large diameter thin wall pipe, filler is preferably pine
Perfume, sand, water, low-melting alloy, polyurethane and plastics.
Further, step (4) carries out progressive bending forming using large diameter thin wall pipe bending mould, and when forming is used
Equipment is ordinary press or pushes away bender.
Further, step (4) carries out progressive bending forming, large diameter thin wall using large diameter thin wall pipe bending mould
The value range of each bending angle of tubing is 5~10 °.
Further, step (4) carries out progressive bending forming, large diameter thin wall using large diameter thin wall pipe bending mould
After tubing is bent every time large diameter thin wall pipe bending mould carry out mobile s, large diameter thin wall pipe bending radius r,
Large diameter thin wall pipe outside diameter d and the relationship of large diameter thin wall pipe wall thickness t are 0.1≤(s/r) × (1- (t/d)2)≤0.5。
Further, when step (5) cleaning large diameter thin wall pipe inside stuffing, first using physics mode removal filling
Object, recycles chemical method oil removing, and final clear water flushing is dried.
The present invention compared with the existing technology the utility model has the advantages that
(1) large diameter thin wall pipe of institute's bending forming of the present invention is high-quality, and die life is long, and safe and reliable, qualified
Rate is high；
(2) present invention is designed simple with the large diameter thin wall pipe bending mould of manufacture, in ordinary press and can push away
It is used on bender, there is very strong applicability；
(3) present invention in large diameter thin wall pipe bending process, can effectively reduce corrugation, cracking the defects of generation；
(4) the large diameter thin wall pipe dimensional accuracy and type face precision of institute's bending forming of the present invention are higher, can comply fully with
Standard QJ262A-2005 requirement；
(5) the bright and clean beauty of large diameter thin wall pipe appearance of institute's bending forming of the present invention, surface quality is higher, rough surface
Degree Ra can reach 3.2.
Detailed description of the invention
Fig. 1 is schematic diagram before large diameter thin wall pipe of the present invention is bent；
Fig. 2 is schematic diagram after large diameter thin wall pipe of the present invention bending；
Fig. 3 is 1st curved schematic of large diameter thin wall pipe of the present invention；
Fig. 4 is 2nd curved schematic of large diameter thin wall pipe of the present invention；
Fig. 5 is 3rd curved schematic of large diameter thin wall pipe of the present invention；
Fig. 6 is flow chart of the invention.
Specific embodiment
Highly preferred embodiment of the present invention is described in further detail with reference to the accompanying drawing.
The invention belongs to accurate sheet metal processing fields, are related to a kind of transfer deformed area raising large diameter thin wall pipe bending conjunction
The manufacturing process of lattice rate, it is suitable for bending dimensional accuracy, type face precision and the higher large diameter thin wall of surface quality requirements
Tubing.This method is as follows: 1. designing large diameter thin wall pipe bending mould；2. large diameter thin wall pipe makes annealing treatment；3. big straight
Filler is added inside radial thin-wall pipes；4. carrying out progressive bending forming using large diameter thin wall pipe bending mould；5. clearing up
Large diameter thin wall pipe inside stuffing.The present invention carries out progressive bending forming, solution using large diameter thin wall pipe bending mould
The low problem of qualification rate in large diameter thin wall pipe bending process of having determined, improves the surface quality of large diameter thin wall pipe, has
Effect reduce conventional method in corrugation and cracking defect generation, ensure that large diameter thin wall pipe dimensional accuracy, type face precision with
And surface quality requirements.
As shown in fig. 6, a kind of currently preferred transfer deformed area improves the forming of large diameter thin wall pipe bending qualification rate
Method, the specific steps are as follows:
(1) according to the bending radius r for the large diameter thin wall pipe to be shaped, large diameter thin wall pipe bending mould ruler is determined
It is very little；Large diameter thin wall pipe is preferably 5083 and 5A06 wrought aluminium alloy；Large diameter thin wall pipe outside diameter d be preferably 100mm~
300mm, wall thickness t are 1mm~10mm；Large diameter thin wall pipe bent angle alpha is preferably 1 °~45 °, and bending radius r is preferably
200mm~1000mm；The bending radius r of large diameter thin wall pipe bending mould type face arc radius R and large diameter thin wall pipe
Relationship is preferably 0.5≤R/r≤1.
(2) large diameter thin wall pipe is made annealing treatment；Large diameter thin wall pipe is made annealing treatment, annealing temperature
Preferably 250 DEG C~350 DEG C, soaking time is preferably 0.5h~2h.
(3) filler is added inside the large diameter thin wall pipe after step (2) annealing；In large diameter thin wall pipe
Filler is added in inside, and filler is rosin, sand, water, low-melting alloy, polyurethane and plastics.Filler is preferably rosin
And sand, the ratio of rosin and sand are preferably (1~2): 1.
(4) the large diameter thin wall pipe bending mould after determining size using step (1) carries out progressive bending forming, forming
It needs to shift deformed area in the process；Progressive bending forming, large diameter thin wall pipe are carried out using large diameter thin wall pipe bending mould
The value range of each bending angle of material is preferably 5~10 °；Progressive bending is carried out using large diameter thin wall pipe bending mould
Forming, large diameter thin wall pipe bending mould carries out mobile s, large diameter thin wall pipe after large diameter thin wall pipe is bent every time
The preference relation of the bending radius r of material, large diameter thin wall pipe outside diameter d and large diameter thin wall pipe wall thickness t are 0.1≤(s/r)
×(1-(t/d)2)≤0.5 meets this and requires large diameter thin wall pipe bending qualification rate higher；It is curved using large diameter thin wall pipe
Bent mold carries out progressive bending forming, and device therefor is ordinary press or pushes away bender when forming, and preferred equipment is to push away bender,
Bender master cylinder tonnage is pushed away greater than 10t.
(5) inside stuffing of the large diameter thin wall pipe after cleanup step (4) forming, obtains large diameter thin wall pipe.
When clearing up large diameter thin wall pipe inside stuffing, filler is first removed using physics mode, recycles chemical method oil removing, most
Whole clear water flushing is dried.
Specific preferred embodiment is carried out by following processing step:
It is preferably the aluminium alloys such as 5083 and 5A06, large diameter thin wall pipe that the present invention, which wants curved large diameter thin wall pipe material,
Material diameter is preferably 100mm~300mm, and wall thickness is preferably 1mm~10mm, and large diameter thin wall pipe bent angle alpha is preferably 1 °
~45 °, bending radius r is preferably 200mm~1000mm.
By taking certain aluminium alloy large diameter thin wall pipe as an example, geomery is shown in Fig. 1, major diameter before large diameter thin wall pipe is bent
Geomery is shown in that Fig. 2, large diameter thin wall pipe material are 5083 aluminium alloys, large diameter thin wall pipe diameter after thin-wall pipes bending
D is preferably 200mm, and wall thickness t is preferably 10mm, and large diameter thin wall pipe bent angle alpha is preferably 21 °, and bending radius r is preferably
800mm, both ends length of straigh line are preferably 600mm.
Preferred embodiment is carried out by following processing step:
Step 1 designs large diameter thin wall pipe bending mould according to the bending radius r of large diameter thin wall pipe, big straight
Radial thin-wall pipes bending mould type face arc radius R preferably takes 500mm, R/r=500/800=0.625, and preferably 0.5≤R/r≤
1 requires.
Step 2 makes annealing treatment large diameter thin wall pipe, and annealing temperature is preferably 300 DEG C~350 DEG C, when heat preservation
Between preferably 1h~2h.
Step 3, is added filler inside large diameter thin wall pipe, and filler is preferably rosin and sand, rosin and sand
The ratio of son is preferably (1.5~2): 1.
Step 4 carries out progressive bending forming using large diameter thin wall pipe bending mould, and device therefor is to push away when forming
Bender, master cylinder tonnage 20t.As shown in figure 3, figure 4 and figure 5, the 1st large diameter thin wall pipe bending angle is 7 °, the 2nd time big straight
Radial thin-wall pipes bending angle is 7 °, and the 3rd large diameter thin wall pipe bending angle is 6 °, and it is each to meet large diameter thin wall pipe
Bending angle value range be 5~10 ° requirement.It is big straight after large diameter thin wall pipe the 1st time bending and after the 2nd bending
Radial thin-wall pipes bending mould carries out mobile s and preferably takes 50mm, (s/r) × (1- (t/d)2)=(50/200) × (1-
(10/200)2)=0.249, preferably 0.1≤(s/r) × (1- (t/d)2)≤0.5 requires.
Step 5 when clearing up large diameter thin wall pipe inside stuffing, first removes filler using physics mode, recycles
Chemical method oil removing, final clear water flushing are dried.
The large diameter thin wall pipe surface roughness Ra 3.2 prepared using the method is greatly reduced corrugation and cracking etc. and lacked
It falls into, reduces by 10% than existing method manufacturing cost, processing efficiency improves 20%.
The present invention is there are also a kind of preferred embodiment, according to the bending radius r of large diameter thin wall pipe described in step (1),
Large diameter thin wall pipe bending mould is designed, large diameter thin wall pipe bending mould type face arc radius R preferably takes 600mm, R/r
=600/800=0.75 meets the requirement of 0.5≤R/r≤1, can reduce large diameter thin wall pipe bending corrugation possibility, improve big
Diameter thin-wall pipes are bent qualification rate.
The present invention makes annealing treatment large diameter thin wall pipe described in step (2), moves back there are also a kind of preferred embodiment
Fiery temperature is preferably 310 DEG C~320 DEG C, and soaking time is preferably 1.5h~2h, can reduce large diameter thin wall pipe bending crack
Possibility improves large diameter thin wall pipe and is bent qualification rate.
Filler is added described in step (3) there are also a kind of preferred embodiment in the present invention inside large diameter thin wall pipe,
Filler is preferably rosin and sand, and the ratio of rosin and sand is preferably (1.5~1.8): 1, large diameter thin wall pipe can be reduced
Material bending crack possibility improves large diameter thin wall pipe and is bent qualification rate.
There are also a kind of preferred embodiments by the present invention, progressive curved using the progress of large diameter thin wall pipe bending mould in step (4)
Song forming, device therefor is to push away bender when forming, and the preferred 30t of master cylinder tonnage, can reduce large diameter thin wall pipe bending crack can
Energy property improves large diameter thin wall pipe and is bent qualification rate.
The large diameter thin wall pipe of institute's bending forming of the present invention is high-quality, and die life is long, and safe and reliable, qualification rate
It is high；Designed and manufacture large diameter thin wall pipe bending mould is simple, can use, have on bender in ordinary press and pushing away
Very strong applicability；In large diameter thin wall pipe bending process, can effectively reduce corrugation, cracking the defects of generation；Institute is curved
The large diameter thin wall pipe dimensional accuracy and type face precision of song forming are higher, can comply fully with standard QJ262A-2005 requirement；Institute
The bright and clean beauty of large diameter thin wall pipe appearance of bending forming, surface roughness Ra can reach 3.2, and surface quality is higher.
Claims (4)
1. the manufacturing process that a kind of transfer deformed area improves large diameter thin wall pipe bending qualification rate, it is characterised in that steps are as follows:
(1) according to the bending radius r for the large diameter thin wall pipe to be shaped, large diameter thin wall pipe bending mould size is determined；
The bending radius r relationship of large diameter thin wall pipe bending mould type face arc radius R and large diameter thin wall pipe is 0.5≤R/r
≤1；Large diameter thin wall pipe described in step (1) is 5083 or 5A06 wrought aluminium alloy；
(2) large diameter thin wall pipe is made annealing treatment；Described makes annealing treatment large diameter thin wall pipe, annealing temperature
Degree is 250 DEG C~350 DEG C, and soaking time is 0.5h~2h；
(3) filler is added inside the large diameter thin wall pipe after step (2) annealing；
(4) the large diameter thin wall pipe bending mould after determining size using step (1) carries out progressive bending forming, forming process
In need to shift deformed area；Progressive bending forming is carried out using large diameter thin wall pipe bending mould, and device therefor is when forming
Ordinary press pushes away bender；Step (4) carries out progressive bending forming using large diameter thin wall pipe bending mould, and major diameter is thin
The value range of each bending angle of wall tube material is 5~10 °；Step (4) is carried out using large diameter thin wall pipe bending mould
Progressive bending forming, large diameter thin wall pipe bending mould carries out mobile s, big straight after large diameter thin wall pipe is bent every time
The relationship of the bending radius r of radial thin-wall pipes, large diameter thin wall pipe outside diameter d and large diameter thin wall pipe wall thickness t is 0.1≤
(s/r)×(1-(t/d)2)≤0.5, large diameter thin wall pipe bending mould type face arc radius R and large diameter thin wall pipe
Bending radius r relationship is 0.5≤R/r≤1；
(5) inside stuffing of the large diameter thin wall pipe after cleanup step (4) forming, obtains large diameter thin wall pipe, clears up
When large diameter thin wall pipe inside stuffing, filler is first removed using physics mode, recycles chemical method oil removing, it is final clear
Water flushing is dried.
2. a kind of transfer deformed area according to claim 1 improves the manufacturing process of large diameter thin wall pipe bending qualification rate,
It is characterized by: large diameter thin wall pipe outside diameter d described in step (1) is 100mm~300mm, wall thickness t is 1mm~10mm.
3. a kind of transfer deformed area according to claim 1 improves the manufacturing process of large diameter thin wall pipe bending qualification rate,
It is characterized by: large diameter thin wall pipe bent angle alpha described in step (1) be 1 °~45 °, bending radius r be 200mm~
1000mm。
4. a kind of transfer deformed area according to claim 1 improves the manufacturing process of large diameter thin wall pipe bending qualification rate,
It is characterized by: filler is added described in step (3) inside large diameter thin wall pipe, filler is rosin, sand.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711076801.6A CN107695151B (en) | 2017-11-06 | 2017-11-06 | Improve the manufacturing process of large diameter thin wall pipe bending qualification rate in a kind of transfer deformed area |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711076801.6A CN107695151B (en) | 2017-11-06 | 2017-11-06 | Improve the manufacturing process of large diameter thin wall pipe bending qualification rate in a kind of transfer deformed area |
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| Publication Number | Publication Date |
|---|---|
| CN107695151A CN107695151A (en) | 2018-02-16 |
| CN107695151B true CN107695151B (en) | 2019-11-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711076801.6A Active CN107695151B (en) | 2017-11-06 | 2017-11-06 | Improve the manufacturing process of large diameter thin wall pipe bending qualification rate in a kind of transfer deformed area |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57152319A (en) * | 1981-03-17 | 1982-09-20 | Sumitomo Metal Ind Ltd | Manufacture of elbow |
| CN101700543A (en) * | 2009-11-17 | 2010-05-05 | 江苏华阳管业股份有限公司 | Molding method of non-standard bent pipe mold |
| CN102873148A (en) * | 2012-09-29 | 2013-01-16 | 北京航星机器制造公司 | Simple bending method of large-diameter thin-walled aluminum tube |
| CN104475517A (en) * | 2014-10-24 | 2015-04-01 | 上海通用金属结构工程有限公司 | Thick-wall stainless steel pipe bending method |
| CN105436270A (en) * | 2015-12-11 | 2016-03-30 | 北京有色金属研究总院 | Method for machining metal pipe with tapered elbow |
-
2017
- 2017-11-06 CN CN201711076801.6A patent/CN107695151B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57152319A (en) * | 1981-03-17 | 1982-09-20 | Sumitomo Metal Ind Ltd | Manufacture of elbow |
| CN101700543A (en) * | 2009-11-17 | 2010-05-05 | 江苏华阳管业股份有限公司 | Molding method of non-standard bent pipe mold |
| CN102873148A (en) * | 2012-09-29 | 2013-01-16 | 北京航星机器制造公司 | Simple bending method of large-diameter thin-walled aluminum tube |
| CN104475517A (en) * | 2014-10-24 | 2015-04-01 | 上海通用金属结构工程有限公司 | Thick-wall stainless steel pipe bending method |
| CN105436270A (en) * | 2015-12-11 | 2016-03-30 | 北京有色金属研究总院 | Method for machining metal pipe with tapered elbow |
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|---|---|
| CN107695151A (en) | 2018-02-16 |
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