CN107944155A - The 3 D auto bending process analysis method of section bar - Google Patents
The 3 D auto bending process analysis method of section bar Download PDFInfo
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Abstract
The invention discloses the analysis method of the 3 D auto bending process of section bar.Specifically：First, by the calculating of transverse section of section material shape position of form center, determine the position at bending die center；Second, according to the required curved shape of section bar, certain of section bar is selected while being used as flexural loading side, determines the bending direction of section bar；3rd, the 3-D geometric model of section bar is segmented, including straight section, non-standard arc section, arc section, establish straight section, non-standard arc section, the angle of arc section geometry and bending die eccentric velocity u, angular speed w, bending die and X-axis positive direction, the quantitative relation between the key process parameter such as run duration t, tubing axial direction fltting speed v；4th, obtained quantitative relation value is substituted into software and carries out simulation calculating and processing, draws corresponding technological parameter；5th, corresponding technological parameter is substituted into equipment and performs bending forming.Actual mechanical process of the present invention is easy, and the section bar bent out has preferable forming effect.
Description
Technical field
The invention belongs to section components advanced manufacturing technology field, the 3 D auto bending process of more particularly to a kind of section bar
Analysis method.
Background technology
The section bar of various cross sectional shapes has obtained extensively in fields such as automotive body structure, bullet train, aerospace, buildings
General application, for mitigate weight, reduce cost, improve material performance have the function that it is important.
Domestic existing Steel Bar Bending method all existing certain limitation in actual production is used, in full
Control is gone for a stroll, for the section bar of different curved shapes, it is necessary to and bending die is replaced, greatly reduces the efficiency of production, meanwhile,
, it is necessary to which different bending die, a kind of shape correspond to a set of bending die, production cost is high for section bar for differently curved shape；Draw
It is curved, bend, push away it is curved etc. be also only applicable to simple shape, the shaping of section bar that bending radius discontinuously changes.And for complex-shaped
Section bar, its forming quality and performance are all difficult to ensure that.
And it is now domestic also without corresponding section bar 3 D auto bending techniques, the 3 D auto bending forming of section bar can be real
The bending forming of the complicated shape section bar now changed to complex-shaped space section bar and continual curvature, can increase substantially life
Produce efficiency and reduce production cost.
The content of the invention
The complicated shape structure that existing shape bending method changes for complex-shaped space section bar or continual curvature
Part, its method shaped have certain limitation.The present invention is directed to the deficiency of existing bent section method, it is proposed that a kind of
The 3 D auto bending process analysis method of section bar.First the centre of form of section bar is calculated, it is then determined that the bending direction of section bar,
Geometrical model is segmented, next establishes geometry and the quantitative relation of technological parameter, carries out simulation and calculates and handle, most
The bending forming of section bar is realized afterwards.Concrete technical scheme is as follows:
The analysis method of the 3 D auto bending process of section bar a kind of, is realized through the following steps：
The first step, the calculating to the transverse section of section material shape centre of form, determines the position at bending die center；
Second step, according to the required curved shape of section bar, determines the bending direction of section bar；
3rd step, the 3-D geometric model of section bar is segmented, including straight section, non-standard arc section, arc section；
4th step, the quantity established between the geometric shape parameters and technological parameter of straight section, non-standard arc section, arc section are closed
System；
5th step, obtained quantitative relation value is brought into software and carries out simulation calculating and processing, draws corresponding technological parameter；
6th step, corresponding technological parameter is brought into bending forming is performed in equipment.
Preferably, in the first step, the calculating to the transverse section of section material shape centre of form, determines the position at bending die center：
Preferably, arbitrary transverse section of section material figure, the coordinate of the centre of form are (y, z), its area is A, y-axis and z-axis for figure institute
Reference axis planar.
When transverse section of section material figure is simple graph：
,
In formula, SyStatic moment for figure to z-axis；SzFor the static moment of figure y-axis.
When section bar section is made of several simple figures, the centre of form coordinate calculation formula in section bar section is：
,
In formula, AiFor the area of i-th of figure；yiFor the centre of form coordinate of i-th of figure on the y axis；ziIt is i-th of figure in z-axis
On centre of form coordinate.
Preferably, in second step, according to the required curved shape of section bar, certain of section bar is selected while being used as flexural loading
Side, determines the bending direction of section bar.
Preferably, in the 3rd step, the 3-D geometric model of section bar is segmented, successively including the first straight section, non-standard
Arc section, arc section, the second straight section；
Preferably, in the 4th step, the geometric shape parameters bag of the first straight section, non-standard arc section, arc section, the second straight section is established
Include the first straight section length L, the radius of curvature R of circular arc, angle of bend θ etc. and bending die eccentric motion speed u, angular speed w, bending die
With the angle of X-axis positive direction, section bar axial feeding speed v, run duration t, bending die center is between guiding mechanism front end
Quantitative relation between distance A.
Preferably, the quantitative relation is as follows, and wherein tubing axial feeding, which remains a constant speed, moves v, and bending die is eccentric
Movement velocity u points are bending die x to movement velocity ux, bending die y is to movement velocity uy,For each of time.
First straight section：Bending die eccentric motion speed ux=uy=0, w=0, run duration；
Non-standard arc section：
,,
Angular speed, run duration；
Standard arc section：Bending die movement velocity ux=uy=0, section bar axial feeding distance,
Run duration；
Straight section：Bending die movement velocity,,
, run duration。
Beneficial effect：
1. the present invention provides a kind of new industrial analysis method for the bending forming of section bar；
2. the present invention can change the size of bending radius, while the control for passing through computer at any time by varying the size of eccentricity
The bending radius and bending direction of section bar can continuously be changed, can easily meet various shape bending forms, operability
It is good with controlling；
3. the present invention is widely used in fields such as section bar automotive body structure, bullet train, aerospace, buildings,
For mitigate weight, reduce cost, improve material performance have the function that it is important.
Brief description of the drawings
Fig. 1：Section bar 3 D auto bending process analysis method flow chart.
Fig. 2：The bending process analysis method example of squared profile.
In Fig. 2：The first straight sections of 1-, the non-standard arc sections of 2-, 3- arc sections, the second straight sections of 4-.
Fig. 3：The bending process analysis method example of " L " shape section bar.
In Fig. 3：The first straight sections of 5-, the non-standard arc sections of 6-, 7- arc sections, the second straight sections of 8-.
Fig. 4：The bending process analysis method example of abnormal-shaped section bar.
In Fig. 4：The first straight sections of 9-, the non-standard arc sections of 10-, 11- arc sections, the second straight sections of 12-.
Embodiment
Below in conjunction with squared profile, " L " shape section bar, the specific implementation example of abnormal-shaped section bar, carries out the present invention detailed
Describe in detail bright.
Embodiment 1
The specification of squared profile is 20 × 20mm, chamfering 2mm.
The first step, calculates the centre of form of section bar, since the planar graph of squared profile is simple, so according to calculation formula：
,,
The coordinate of the centre of form is（10,10）.
Second step, since section bar is square, takes section bar curved to y-axis direction here.
3rd step, square shaped section bar are segmented, as shown in Figure 2.
4th step, takes axial feeding speed v=10mm/s of section bar, bending die center to distance A between guiding mechanism front end
For 30mm, a length of 100mm of two straight sections, the radius R of arc section is 60mm,The dimensional parameters are converted into each
Segment actual flexion technological parameter, establishes 1 length of the first straight section of geometric shape parameters of straight section, non-standard arc section, arc section
L, the radius of curvature R of circular arc and bending die eccentric motion speed u, section bar axial feeding speed v, run duration t, bending die center
As follows to the quantitative relation between distance A between guiding mechanism front end, wherein tubing axial feeding, which remains a constant speed, moves v,
Bending die eccentric motion speed u points are bending die x to movement velocity ux, bending die y is to movement velocity uy,For each section of movement
Time.
First straight section 1：Bending die eccentric motion speed ux=uy=0, v=10, w=0, run duration；
Non-standard arc section 2：
；
Angular speed w=, run duration；
Standard arc section 3：Bending die movement velocity ux=uy=0, w=0, section bar axial feeding distance, run duration；
Second straight section 4：Bending die movement velocity；
；
；Run duration。
5th step, obtained quantitative relation value is brought into software and carries out simulation calculating and processing, draws corresponding technique
Parameter；
6th step, corresponding technological parameter is brought into bending forming is performed in equipment.
Embodiment 2
The specification of " L " shape section bar is that the length on long one side is 40mm, and the length on short one side is 30mm, thickness 4mm.
The first step, calculates the centre of form of section bar, since the planar graph of " L " shape section bar is made of several simple figures
When, composite figure centre of form coordinate calculation formula is：
,,
,,
,
；
The coordinate of the centre of form is（7.57 12.29）.
Second step, since section bar is " L " shape, different curved shapes can be obtained using different sides as bending direction, this
In take the length of side for 30mm as curved edges.
3rd step, is segmented " L " section bar, as shown in Figure 3.
4th step, takes axial feeding speed v=10mm/s of section bar, bending die center to distance A between guiding mechanism front end
For 32mm, a length of 100mm of two straight sections, the radius R of arc section is 240mm, and θ=35 °, φ=90 °, which is converted into often
A bit of actual flexion technological parameter, establish straight section, non-standard arc section, arc section geometric shape parameters such as straight section length L,
Radius of curvature R, the angle of bend of circular arcDeng with bending die eccentric motion speed u, section bar axial feeding speed v, run duration t, curved
Bent mould center is as follows to the quantitative relation between distance A between guiding mechanism front end, and wherein tubing axial feeding is kept even
V, bending die eccentric motion speed u points of speed movement is bending die x to movement velocity ux, bending die y is to movement velocity uy,To be each
The time of section.
First straight section 5：Bending die eccentric motion speed ux=uy=0, v=10, w=0, run duration；
Non-standard arc section 6：
；
；
Angular speed w=, run duration；
Standard arc section 7：Bending die movement velocity ux=uy=0, w=0, section bar axial feeding distance, run duration；
Second straight section 8：Bending die movement velocity；
；
；Run duration。
5th step, obtained quantitative relation value is brought into software and carries out simulation calculating and processing, draws corresponding technique
Parameter；
6th step, corresponding technological parameter is brought into bending forming is performed in equipment.
Embodiment 3
It is " returning " that the shape of abnormal-shaped section bar is similar, and outer specification is 40 × 30mm, and interior specification is 34 × 26mm, the thickness on one side
For 4mm, the thickness on other three sides is 2mm.
The first step, calculates the centre of form of section bar, since the planar graph of " returning " shape section bar is by several simple graphical sets
Cheng Shi, composite figure centre of form coordinate calculation formula are：
,,
,
,
There is a vertical symmetry axis in the cross section of abnormal-shaped section bar, its centre of form is inevitable on this symmetry axis, so the section bar centre of form
Abscissa is,
Ordinate is（Note：Area A2Subtract, therefore above formula computing
When, A2Brought into negative value）；
The coordinate of the centre of form is（15,17.2）.
Second step, it is that one side that the length of side is 40mm is bent as stress side to take shape bending direction.
3rd step, odd-shaped cross section are segmented section bar, as shown in Figure 4.
4th step, takes axial feeding speed v=10mm/s of section bar, bending die center to distance A between guiding mechanism front end
For 32mm, the radius R of arc section is 90mm, and θ=75 °, φ=90 °, which is converted into per a bit of actual flexion work
Skill parameter, establish straight section, non-standard arc section, arc section the geometric shape parameters such as radius of curvature R of straight section length L, circular arc,
Angle of bend θ etc. and bending die eccentric motion speed u, section bar axial feeding speed v, run duration t, bending die center to Guiding machine
Quantitative relation between structure front end between distance A is as follows, and wherein tubing axial feeding, which remains a constant speed, moves v, and bending die is inclined
Heart movement velocity u points are bending die x to movement velocity ux, bending die y is to movement velocity uy,For each of time.
First straight section 9：Bending die eccentric motion speed ux=uy=0, v=10, w=0, run duration；
Non-standard arc section 10：
；
；
Angular speed w=, run duration；
Standard arc section 11：Bending die movement velocity ux=uy=0, w=0, section bar axial feeding distance, run duration；
Second straight section 12：Bending die movement velocity；
；
；Run duration
5th step, obtained quantitative relation value is brought into software and carries out simulation calculating and processing, draws corresponding technological parameter；
6th step, corresponding technological parameter is brought into bending forming is performed in equipment.
Claims (7)
1. the analysis method of the 3 D auto bending process of section bar, it is characterised in that realize through the following steps：
The first step, the calculating to the transverse section of section material shape centre of form, determines the position at bending die center；
Second step, according to the required curved shape of section bar, determines the bending direction of section bar；
3rd step, the 3-D geometric model of section bar is segmented, including straight section, non-standard arc section, arc section；
4th step, establishes the quantitative relation of straight section, non-standard arc section, the geometric shape parameters of arc section and technological parameter；
5th step, carries out simulation by the quantitative relation value obtained in previous step and calculates and handle, draw corresponding technological parameter；
6th step, corresponding technological parameter is substituted into equipment and performs bending forming.
2. the analysis method of the 3 D auto bending process of section bar according to claim 1, it is characterised in that：In the first step,
Calculate and obtain the transverse section of section material shape centre of form, determine the center i.e. section bar centre of form of bending die.
3. the analysis method of the 3 D auto bending process of section bar according to claim 1 or claim 2, it is characterised in that：The first step
In, arbitrary section bar sectional view, the coordinate of its centre of form is (y, z), area A, y-axis and the z-axis plane where section bar section
Interior reference axis；
When transverse section of section material is with 1 graphics calculations, the centre of form coordinate calculation formula of transverse section of section material is：
；
In formula, SyStatic moment for section bar sectional view to z-axis；SzFor the static moment of section bar sectional view y-axis；
When transverse section of section material forms calculating with several figures, the centre of form coordinate calculation formula of transverse section of section material is：
；
In formula, AiFor the area of i-th of figure；yiFor the centre of form coordinate of i-th of figure on the y axis；ziIt is i-th of figure in z-axis
On centre of form coordinate.
4. the analysis method of the 3 D auto bending process of section bar according to claim 1, it is characterised in that：In second step,
According to the required curved shape of section bar, one side of section bar is selected as flexural loading side, determines the bending direction of section bar.
5. the analysis method of the 3 D auto bending process of section bar according to claim 1, it is characterised in that：In 3rd step,
The 3-D geometric model of section bar is segmented, successively including the first straight section, non-standard arc section, arc section, the second straight section.
6. the analysis method of the 3 D auto bending process of section bar according to claim 5, it is characterised in that：In 4th step,
Establishing the first straight section, non-standard arc section, arc section, the geometric shape parameters of the second straight section includes the first straight section length L, circular arc
Angle with bending die eccentric motion speed u, angular speed w, bending die and X-axis positive direction of radius of curvature R, angle of bend θ etc.、
Section bar axial feeding speed v, run duration t, bending die center to the quantitative relation between distance A between guiding mechanism front end.
7. the analysis method of the 3 D auto bending process of section bar according to claim 6, it is characterised in that：In 4th step,
The geometric shape parameters of section bar are converted into each section of curved technological parameter by following formula, wherein tubing is axially promoted and protected
Hold uniform motion v, u points of the eccentric velocity of bending die is bending die x to movement velocity ux, bending die y is to movement velocity uy,For
Each section of run duration；
First straight section：Bending die eccentric motion speed ux=uy=0, w=0, run duration；
Non-standard arc section：
,,
Angular speed w=, run duration；
Standard arc section：Bending die movement velocity ux=uy=0, section bar axial feeding distance, fortune
The dynamic time；
Second straight section：Bending die movement velocity,,
, run duration。
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| CN108746283A (en) * | 2018-05-21 | 2018-11-06 | 南京航威智造科技有限公司 | A kind of technique optimization method improving three-dimensional hollow component forming precision |
| CN110860591A (en) * | 2019-11-26 | 2020-03-06 | 南通莱特伟特汽配科技有限公司 | Section bar bending structure |
| CN111085580A (en) * | 2019-11-28 | 2020-05-01 | 南京航空航天大学 | Continuous free bending accurate forming method |
| CN114065451A (en) * | 2021-10-28 | 2022-02-18 | 西北工业大学 | Three-dimensional free bending pipe fitting digital expression method |
| CN115795746A (en) * | 2023-02-09 | 2023-03-14 | 广州高谱机械科技有限公司 | Design method and application of bending die and storage medium |
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| CN115795746A (en) * | 2023-02-09 | 2023-03-14 | 广州高谱机械科技有限公司 | Design method and application of bending die and storage medium |
| CN115795746B (en) * | 2023-02-09 | 2023-05-12 | 广州高谱机械科技有限公司 | Bending die design method, bending device and computer storage medium |
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