CN109622682A - Springback compensation method in a kind of heating bending process - Google Patents
Springback compensation method in a kind of heating bending process Download PDFInfo
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- CN109622682A CN109622682A CN201811595842.0A CN201811595842A CN109622682A CN 109622682 A CN109622682 A CN 109622682A CN 201811595842 A CN201811595842 A CN 201811595842A CN 109622682 A CN109622682 A CN 109622682A
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- bending
- forming
- temperature
- angle
- rebound
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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
- B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
- B21D5/006—Bending sheet metal along straight lines, e.g. to form simple curves combined with measuring of bends
-
- 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
-
- 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
- B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
- B21D5/06—Bending sheet metal along straight lines, e.g. to form simple curves by drawing procedure making use of dies or forming-rollers, e.g. making profiles
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
Abstract
The invention discloses springback compensation methods in a kind of heating bending process, comprising: chooses two different forming temperatures, measures bending angle after the rebound at two temperature respectively；Bending angle angle slope after rebound of the material in hot-bending forming is calculated using bending angle after selected forming temperature and corresponding rebound；Formal bending forming temperature for the first time is determined according to bending angle angle slope, and measures bending angle after the rebound under relevant temperature；Work as previous forming temperature using the drift correction of bending angle and aim bending angle after last time rebound, until bending forming number reaches preset forming piece.The present invention is not in changing mold bending technique in the case where die parameters, bending angle after mold bending technique is sprung back can be compensated by adjusting the temperature being applied on plate, improve the consistency of bool angle after shaping, the die trial time that repairs a die is eliminated, the flexibility of one set of die forming unlike material plate is improved.
Description
Technical field
The present invention relates to springback compensation methods in field of material processing more particularly to a kind of heating bending process.
Background technique
In plate bending process, external force is worked as in plate outer layer fiber tensile strain effect, inner fiber compressive strain effect
After unloading, inner fiber discharges compression and extends, and outer layer fiber discharges tensile stress and shrinks, after such plate bending unloading
Bending angle reduces before relatively unloading, and the reduction amount of bending angle is bending rebound quantity.The size of plate springback capacity is affected by many factors,
Such as material property, bool geometry etc..The demand of automotive energy-saving emission-reducing is answered, high-strength panel demand is more and more, but with
The raising of high-intensitive plate surrender and intensity, bending rebound quantity is also bigger, for mold bending technique, if plate
It can be consistent, so that it may by adjusting the method for mold shape, bool is close with target flexural part as far as possible after realizing rebound, but
It is the plate often different batches after rolling, different volumes and different directions can all bring the mechanical property difference of plate,
Such plate it is difficult to ensure that forming after result consistency.If it is unpractical for repair a die for each piece of plate, benefit
With heating bending springback compensation method of the invention, the consistency of part after mold bending process forming is increased substantially, is reduced
The cost that repairs a die of mold, improves production efficiency.
Summary of the invention
Bending rebound quantity is inconsistent after forming caused by inconsistency for plate performance, and the present invention provides a kind of heat
Bending springback compensation method is bent compensated bend springback capacity using heating.
To achieve the above object, the present invention is realized according to following technical scheme:
Springback compensation method in a kind of heating bending process, which comprises the following steps:
Step A selects two differing formed temperature to be determined the heating bending forming experiment of parameter k；
Step B calculates material bending angle angle slope k after the rebound in heating bending；
Step C determines formal bending forming experimental temperature for the first time and carries out crooked experiment；
Step D works as previous forming temperature using parameter k and bending angle drift correction.
In above-mentioned technical proposal, the experiment of heating bending forming described in step A method particularly includes: utilize induction coil pair
The convex side of bool to be formed is heated, and heating stops heating when reaching selected temperature, and punch-pin pushes rapidly, and bending is completed
Bending angle after record rebound afterwards, shapes 3 times at such a temperature, and bending angle takes average three times after rebound.
In above-mentioned technical proposal, bending angle angle slope k after the rebound of calculating described in step B method particularly includes:Wherein, Tc1And Tc2For two differing formed temperature of selection,Respectively Tc1, Tc2At a temperature of three times plus
Bending angle average value after the rebound of hot-bending forming experiment.
Formal bending forming experimental temperature T1 specific method for the first time is determined in above-mentioned technical proposal, described in step C
Are as follows: T1=T0+(αt-α0)/k, wherein T0=Tc1,αtFor aim bending angle.
In above-mentioned technical proposal, utilization parameter k described in step D and bending angle drift correction are when previous forming temperature tool
Body method are as follows: utilize bending angle and aim bending angle α after last reboundtDrift correction work as previous forming temperature Ti, amendment public affairs
Formula are as follows: Ti=Ti-1+(αt-αi-1)/k, until bending forming number reaches preset forming piece, amendment terminates, and completes experiment.
Compared with the prior art, the invention has the following advantages:
The present invention is not in changing mold bending technique in the case where die parameters, by adjusting the temperature on plate is applied to
Degree can compensate bending angle after the rebound of mold bending technique, improve the consistency of bool angle after forming, eliminate and repair a die
The die trial time improves the flexibility of one set of die forming unlike material plate.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
Other attached drawings are obtained according to these attached drawings.
Fig. 1 is the flow chart of bending springback compensation method of the present invention；
Fig. 2 is the process of bending springback compensation method of the present invention；
Fig. 3 is the flow chart that drift correction forming temperature is utilized in bending springback compensation method of the present invention；
Fig. 4 is that induction coil heats plate schematic diagram；
In figure: 1, punch-pin, 2, plate, 3, induction coil, 4, cavity plate.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.
Fig. 1 is the flow chart of bending springback compensation method of the present invention, as shown in Figure 1, this method comprises:
Step A selects two differing formed temperature to be determined the heating crooked experiment of parameter k；
Step B calculates material bending angle angle slope k after the rebound in heating bending；
Step C determines formal bending forming experimental temperature for the first time；
Step D works as previous forming temperature using parameter k and bending angle drift correction；
Fig. 3 is the flow chart that drift correction forming temperature is utilized in bending springback compensation method of the present invention, as shown in figure 3,
Makeover process are as follows:
(1) forming piece n is preset, according to Tc1And Tc2At a temperature of bending forming experiment obtain parameter k, T0,α0, wherein k
For bending angle angle slope after rebound, T0=Tc1, α0For in Tc1At a temperature of the measured rebound of bending forming experiment after bending angle；
(2) formal bending forming experiment for the first time is carried out, determines formal forming temperature T for the first time1=T0+(αt-α0)/k,
Wherein, αtFor aim bending angle；Measure bend angles alpha after springing back accordingly1；
(3) second of formal bending forming experiment is carried out, and measures bend angles alpha after rebound2, second of forming temperature T2By
Bend angles alpha after springing back for the first time1With aim bending angle αtDrift correction, formula are as follows:
Ti=Ti-1+(αt-αi-1)/k
Wherein, i is as previous forming number, i=1,2,3 ..., n.
(4) step (3) are repeated, until bending forming number reaches preset forming piece, i.e. i=n, experiment terminates.
Below in conjunction with specific embodiment, each above-mentioned step is explained.
Since the present invention is not in changing mold bending technique in the case where die parameters, by adjusting being applied on plate
Temperature can compensate mold bending technique rebound after bending angle, now by Apparatus for Bending at low-temp shape steel plate for.Steel plate specification: steel
The plate trade mark is 22MnB5, and steel plate thickness H is 1mm, and steel plate width B is 50mm, and steel plate length L is 150mm.
Step A: selected bending forming temperature Tc1=74 DEG C, Tc2=438 DEG C, steel plate convex side using induction coil into
Row heating, when temperature reaches Tc1Stop heating at=74 DEG C, punch-pin pushes rapidly, down stroke 85mm, and three are used after rebound
Coordinate measuring apparatus acquires sheet material measurement bending angle, shapes at such a temperature three times, and bending angle is after measuring rebound respectively
104.1 °, 104.2 °, 104.1 °, then average valueIt is 104.13 °.
Similarly, when temperature reaches Tc2Stop heating at=438 DEG C and carry out bending forming, measures bending angle after rebound respectively
It is 98.1 °, 98.2 °, 98.2 °, then average valueIt is 98.17 °；
Step B: bending angle angle slope k after springing back is calculated by the obtained each parameter of step A:
Step C: formal bending forming experiment for the first time is carried out now, it is assumed that the aim bending angle to be shaped is 101 °, then
First time bending forming experimental temperature T1=T0+(αt-α0)/k=264.75 DEG C heats steel plate convex side using induction coil,
When temperature reaches T1Stop heating at=264.75 DEG C, punch-pin pushes rapidly, and down stroke remains unchanged as 85mm, passes through measurer
Measure bend angles alpha after springing back1=101.8 °, and there are deviations for aim bending angle；
Step D: carrying out second of bending forming experiment now, bending angle and aim bending angle after being sprung back using first time
Second of forming temperature of drift correction, takes i=2, then shapes the temperature used for the second time for T2=T1+(αt-α1)/k=313.53
℃。
The above crooked experiment process of third time is as above, is repeated.It is fluctuated if there is material property, the heatings such as mold are drawn
Change in size is played, springback compensation elimination can be carried out using the above method.
Specific embodiments of the present invention are described above.It is to be appreciated that the invention is not limited to above-mentioned
Particular implementation, those skilled in the art can make a variety of changes or modify within the scope of the claims, this not shadow
Ring substantive content of the invention.In the absence of conflict, the feature in embodiments herein and embodiment can any phase
Mutually combination.
Claims (5)
1. springback compensation method in a kind of heating bending process, which comprises the following steps:
Step A selects two differing formed temperature to be determined the heating bending forming experiment of parameter k；
Step B calculates material bending angle angle slope k after the rebound in heating bending；
Step C determines formal bending forming experimental temperature for the first time and carries out crooked experiment；
Step D works as previous forming temperature using parameter k and bending angle drift correction.
2. springback compensation method in heating bending process according to claim 1, it is characterised in that: described in step A
Heating bending forming experiment method particularly includes: heated using convex side of the induction coil to bool to be formed, heat
Stop heating when reaching selected temperature, punch-pin pushes rapidly, and bending angle after record rebound, shapes at such a temperature after the completion of bending
3 times, bending angle takes average three times after rebound.
3. springback compensation method in heating bending process according to claim 2, it is characterised in that: described in step B
Calculating rebound after bending angle angle slope k method particularly includes:Wherein, Tc1And Tc2For selection two differences at
Shape temperature,Respectively Tc1, Tc2At a temperature of heat three times bending forming experiment rebound after bending angle average value.
4. springback compensation method in heating bending process according to claim 3, it is characterised in that: described in step C
Determine formal bending forming experimental temperature T for the first time1Method particularly includes: T1=T0+(αt-α0)/k, wherein T0=Tc1,αtFor aim bending angle.
5. springback compensation method in heating bending process according to claim 4, it is characterised in that: described in step D
Utilization parameter k and bending angle drift correction work as previous forming temperature method particularly includes: using bending angle after last rebound with
Aim bending angle αtDrift correction work as previous forming temperature Ti, correction formula are as follows: Ti=Ti-1+(αt-αi-1)/k, until bending
Forming number reaches preset forming piece, and amendment terminates, and completes experiment.
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| CN201811595842.0A CN109622682B (en) | 2018-12-26 | 2018-12-26 | Springback compensation method in heating bending process |
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| CN201811595842.0A CN109622682B (en) | 2018-12-26 | 2018-12-26 | Springback compensation method in heating bending process |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113560826A (en) * | 2021-08-13 | 2021-10-29 | 燕山大学 | Welded pipe forming method for comprehensively controlling springback through warm forming and light over bending |
| CN114505389A (en) * | 2022-02-17 | 2022-05-17 | 北京理工大学重庆创新中心 | High-strength steel hot stamping forming optimization method for compensating environmental temperature by using mechanism |
Citations (7)
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|---|---|---|---|---|
| JPH10146621A (en) * | 1996-11-13 | 1998-06-02 | Ishikawajima Harima Heavy Ind Co Ltd | Method for bending metallic plate by linear heating |
| CN102500672A (en) * | 2011-10-25 | 2012-06-20 | 山东硕力机械制造有限公司 | Method and device for forming plates through gradual approximation bending |
| CN104307939A (en) * | 2014-09-25 | 2015-01-28 | 北京航星机器制造有限公司 | Springback compensation method of thin-wall stamped part with large relative bending radius |
| CN104794256A (en) * | 2013-11-12 | 2015-07-22 | 埃姆普里萨有限公司 | Springback compensation in formed sheet metal parts |
| CN105868428A (en) * | 2015-01-20 | 2016-08-17 | 迪艾工程技术软件（上海）有限公司 | Springback compensation method of stamped part |
| CN106077170A (en) * | 2016-07-14 | 2016-11-09 | 燕山大学 | A kind of bending curvature springback compensation control method |
| CN106295055A (en) * | 2016-08-22 | 2017-01-04 | 南京埃斯顿自动化股份有限公司 | A kind of bender bending method that upper mold depth is carried out bending springback compensation |
-
2018
- 2018-12-26 CN CN201811595842.0A patent/CN109622682B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10146621A (en) * | 1996-11-13 | 1998-06-02 | Ishikawajima Harima Heavy Ind Co Ltd | Method for bending metallic plate by linear heating |
| CN102500672A (en) * | 2011-10-25 | 2012-06-20 | 山东硕力机械制造有限公司 | Method and device for forming plates through gradual approximation bending |
| CN104794256A (en) * | 2013-11-12 | 2015-07-22 | 埃姆普里萨有限公司 | Springback compensation in formed sheet metal parts |
| CN104307939A (en) * | 2014-09-25 | 2015-01-28 | 北京航星机器制造有限公司 | Springback compensation method of thin-wall stamped part with large relative bending radius |
| CN105868428A (en) * | 2015-01-20 | 2016-08-17 | 迪艾工程技术软件（上海）有限公司 | Springback compensation method of stamped part |
| CN106077170A (en) * | 2016-07-14 | 2016-11-09 | 燕山大学 | A kind of bending curvature springback compensation control method |
| CN106295055A (en) * | 2016-08-22 | 2017-01-04 | 南京埃斯顿自动化股份有限公司 | A kind of bender bending method that upper mold depth is carried out bending springback compensation |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113560826A (en) * | 2021-08-13 | 2021-10-29 | 燕山大学 | Welded pipe forming method for comprehensively controlling springback through warm forming and light over bending |
| CN114505389A (en) * | 2022-02-17 | 2022-05-17 | 北京理工大学重庆创新中心 | High-strength steel hot stamping forming optimization method for compensating environmental temperature by using mechanism |
| CN114505389B (en) * | 2022-02-17 | 2023-12-22 | 北京理工大学重庆创新中心 | High-strength steel hot stamping forming optimization method utilizing mechanism to compensate ambient temperature |
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| CN109622682B (en) | 2019-12-10 |
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