CN105631153B - A kind of corrugated prediction of stamping parts and control method - Google Patents
A kind of corrugated prediction of stamping parts and control method Download PDFInfo
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Abstract
The invention discloses a kind of corrugated prediction of stamping parts and control methods, include the following steps：S1, multiple stamping parts with similar structural characteristics are chosen as analysis sample；S2, the similar structural characteristics of each stamping parts are decomposed, obtains the quantity of the structure feature element for constituting each stamping parts similar structural characteristics and each structure feature element；The forming process of S3, each stamping parts of simulation, obtain the corrugation value of each stamping parts；S4, corrugation criterion is established；S5, corrugation prediction model of the structure based on structure feature element；S6, it brings the corrugation value of each stamping parts in step S3 into corrugation prediction model respectively, obtains the relationship between each structure feature element coefficient, weaken in product design accordingly or enhance corresponding structure feature element to control the generation of wrinkle.The present invention can simply and easily calculate the corrugation risk of stamping parts, the corrugation of fast prediction stamping parts, and then achieve the purpose that prejudge the corrugation of stamping parts in the design phase.
Description
Technical field
The invention belongs to stamping technology field more particularly to a kind of corrugated prediction of stamping parts and control methods.
Background technology
In actual production, stamping parts will appear wrinkling, this makes, and the dimensional accuracy of stamping parts is inaccurate, surface quality
It is bad, to influence assembly precision and product appearance；Moreover, stamping parts corrugation also easily leads to the solder joint in stamping parts welding process
Distortion and solder joint cracking；In addition, because material is worked as stamping parts and (is mostly used for zero, automobile by compared with huge pressing stress at corrugation
The heat-punch member of part) it can take the lead in when bearing load generating fatigue failure and then cause fracture.
The corrugated generation of stamping parts influenced by various factors, such as the material property of metal blank, part and mold
Geometry and other technological parameters etc. including pressure-pad-force, lubricating status.It is found from practical condition, part
Or the geometrical factor of die face is to lead to corrugated key.Therefore, the application proposes a kind of from punching parts structure feature
Angle sets out to predict and control the corrugated method of punching parts.
Invention content
The purpose of the present invention is to provide a kind of corrugated prediction of stamping parts and control methods, it is based on structure by foundation
The corrugation prediction model of characteristic element is predicted to wrinkle, and can simply and easily calculate the corrugation risk of stamping parts, fast prediction
Stamping parts wrinkles, and then achievees the purpose that prejudge the corrugation of stamping parts in the design phase.
The technical solution adopted by the present invention to solve the technical problems is：
A kind of corrugated prediction of stamping parts and control method are provided, included the following steps：
S1, multiple stamping parts with similar structural characteristics are chosen as analysis sample；
S2, the shape according to similar structural characteristics, the similar structural characteristics of each stamping parts are decomposed, and obtain constituting each
The structure feature element 1 of stamping parts similar structural characteristics, 2,3 ..., the quantity n of n and each structure feature elementi, i=(1,
2,3 ..., n), the structure feature element that each stamping parts includes has certain intercrossing, all structure feature elements of induction-arrangement；
S3, the punching press finite element model for establishing each stamping parts, simulate the forming process of each stamping parts, obtain each punching press
The corrugation value of part；
S4, corrugation criterion is established：The stress-strain relation of each stamping parts is
Wherein, ε1It is plane principal strain, ε2It is plane time strain, εtIt is perpendicular to the principal strain of board direction, R is average
The coefficient of normal anisortopy, εiIt is equivalent strain, σiIt is equivalent stress；
Compression due to being parallel to plate face causes to wrinkle, generation and the secondary stress σ of wrinkle2It is related, according to public affairs
Formula (1) obtains
Wherein,Work as σ2When=0, plate is in unidirectional tension state, is with list in forming limit diagram
The form of axis draw line occurs, and line is uniaxially stretched as basic corrugation criterion using this, consider load history on it is corrugated influence with
And the influence of geometry size, obtain corrugation criterion
Wherein, ρ is coefficient related with curvature, εwc>=0, work as εwcWhen=0, plate works as ε without corrugationwcWhen ＞ 0, plate has
Corrugation trend, the value the big, shows that plate corrugation trend is more serious；
S5, corrugation prediction model of the structure based on structure feature element：It establishes between each structure feature element and corrugation
Functional relation, it is assumed that be that simple direct ratio closes between the corrugation trend and structure feature element coefficient of drop stamping beam-like part
System, meets following functional relation：
Wherein k is proportionality coefficient, αiFor structure feature element coefficient, indicate corresponding structure feature element to corrugated tribute
It offers；
S6, bring the corrugation value of each stamping parts in step S3 into formula (4) respectively, obtain each structure feature element coefficient it
Between relationship, if αi>0, then it represents that corresponding structure feature element has a facilitation to corrugation, and when product design weakens the structure
Characteristic element, if αi<0, then it represents that corresponding structure feature element has to corrugation and slows down effect, and when product design enhances the structure
Characteristic element, to control the generation of wrinkle.
According to the above technical scheme, in step S1, the analysis sample is beam-like part or thin wall component.
According to the above technical scheme, in step S1, the analysis sample be 4 beam-like parts, respectively U-shaped part, S-shaped beam,
Flanged (FLGD) automobile front longitudinal beam inner panel and automobile B-pillar inner plate.
According to the above technical scheme, in step S2, all structure feature elements include straight wall, curved surface sidewall, straight top surface, Qu Ding
Face and boss are respectively labeled as 1,2,3,4,5.
According to the above technical scheme, the stamping parts is cold-stamped part, warm stamping parts or heat-punch member.
The beneficial effect comprise that：The present invention by select multiple stamping parts with similar structural characteristics as
Sample is analyzed, and the similar structural characteristics of each stamping parts are decomposed to obtain each structure feature element, makes each stamping parts include
Structure feature element there is certain intercrossing, every stamping parts with the structure feature element can be used as prediction object,
Expand the range of applicable object so that this method has extensive adaptability；Then it is simulated by establishing finite element model
To the corrugation value of each stamping parts, the corrugation prediction model based on each structure feature element is established further according to corrugation criterion, by rising
Wrinkle value and corrugation prediction model analyze to obtain each structure feature element on corrugated influence, so as in the stamping parts design phase
Reinforce or weaken certain structure feature element, achievees the purpose that prejudge the corrugation of stamping parts in the design phase.The present invention can
Directly to assess the corrugated risk of stamping parts according to corrugation prediction model, stamping parts structure design is optimized, die trial time is reduced
Number has significant economy to reduce design cycle and cost.
Description of the drawings
Present invention will be further explained below with reference to the attached drawings and examples, in attached drawing：
Fig. 1 is the structural schematic diagram of 4 beam-like parts in the embodiment of the present invention；
Fig. 2 is the punching press FEM model schematic diagram of automobile B-pillar inner plate in present inventor's embodiment；
Fig. 3 is the corrugation analog result figure of 4 beam-like parts in the embodiment of the present invention；
Fig. 4 is the coordinate schematic diagram of 5 structure feature element coefficients in the embodiment of the present invention.
In figure：The flanged (FLGD) automobile front longitudinal beam inner panel of 1-U shapes part, 2-S ellbeams, 3-, 4- automobile B-pillar inner plates, 5- punch-pin, 6-
The blank of cavity plate, 7- automobile B-pillar inner plates.
Specific implementation mode
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that described herein, specific examples are only used to explain the present invention, not
For limiting the present invention.
A kind of corrugated prediction of stamping parts and control method, include the following steps：
S1, multiple stamping parts with similar structural characteristics are chosen as analysis sample；
S2, since the forming mode of all stamping parts is all draw forming, so according to the shape of similar structural characteristics come
Classify, the similar structural characteristics of each stamping parts are decomposed, obtains the structure for constituting each stamping parts similar structural characteristics
Characteristic element 1,2,3 ..., the quantity n of n and each structure feature elementi, i=(1,2,3 ..., n), each stamping parts includes
Structure feature element has certain intercrossing, all structure feature elements of induction-arrangement；
S3, the punching press finite element model for establishing each stamping parts, simulate the forming process of each stamping parts, obtain each punching press
The corrugation value of part；
S4, corrugation criterion is established：The stress-strain relation of each stamping parts is
Wherein, ε1It is plane principal strain, ε2It is plane time strain, εtIt is perpendicular to the principal strain of board direction, R is average
The coefficient of normal anisortopy, εiIt is equivalent strain, σiIt is equivalent stress；
Compression due to being parallel to plate face causes to wrinkle, generation and the secondary stress σ of wrinkle2It is related, according to public affairs
Formula (1) obtains
Wherein,Work as σ2When=0, plate is in unidirectional tension state, is with list in forming limit diagram
The form of axis draw line occurs, and line is uniaxially stretched as basic corrugation criterion using this, consider load history on it is corrugated influence with
And the influence of geometry size, obtain corrugation criterion
Wherein, ρ is coefficient related with curvature, εwc>=0, work as εwcWhen=0, plate works as ε without corrugationwcWhen ＞ 0, plate has
Corrugation trend, the value the big, shows that plate corrugation trend is more serious；
S5, corrugation prediction model of the structure based on structure feature element：It establishes between each structure feature element and corrugation
Functional relation, it is assumed that be that simple direct ratio closes between the corrugation trend and structure feature element coefficient of drop stamping beam-like part
System, meets following functional relation：
Wherein k is proportionality coefficient, αiFor structure feature element coefficient, indicate corresponding structure feature element to corrugated tribute
It offers；
S6, bring the corrugation value of each stamping parts in step S3 into formula (4) respectively, obtain each structure feature element coefficient it
Between relationship, if αi>0, then it represents that corresponding structure feature element has a facilitation to corrugation, and when product design weakens the structure
Characteristic element, if αi<0, then it represents that corresponding structure feature element has to corrugation and slows down effect, and when product design enhances the structure
Characteristic element, to control the generation of wrinkle.
Stamping parts in the present invention can be that cold-stamped part, warm stamping parts and heat-punch member, the present invention can be to phases
It is predicted and is controlled like the corrugation of the beam-like part or thin wall component of structure feature, there is extensive adaptability.Below with
For the beam-like part of drop stamping, the present invention includes the following steps：
S1, divide as shown in Figure 1, being chosen at similar in structure feature but 4 beam-like parts conduct with different
Sample is analysed, which is respectively U-shaped part 1, S-shaped beam 2, flanged (FLGD) automobile front longitudinal beam inner panel 3 and automobile B-pillar inner plate 4,
Its otherness in structure feature is presented as that shape is similar but complexity is different；
S2, the structure feature element for defining beam-like part：The similar structural characteristics of each stamping parts are decomposed, structure is obtained
At the structure feature element 1,2,3,4,5 of each stamping parts similar structural characteristics and the quantity n of each structure feature elementi, i=
(1,2,3,4,5) refer to table 1, and there is respectively U-shaped part 12 straight walls and 1 straight top surface, S-shaped beam 2 to have 2 curved surface sidewalls
With 1 straight top surface, there are flanged (FLGD) automobile front longitudinal beam inner panel 32 straight walls and 1 bent top surface, automobile B-pillar inner plate 4 to have 2
Straight wall, 2 curved surface sidewalls, 1 bent top surface and 3 boss, the structure feature element that each stamping parts includes have certain intercrossing,
That is at least two stamping parts include common structure feature element, all structure feature elements are screened and conclude, by straight wall, curved surface
Side wall, straight top surface, bent top surface and boss are defined as the structure feature element of beam-like part, are respectively labeled as 1,2,3,4,5, side wall
Right and wrong with top surface is by observing the section that part is splitted along the faces xoy and the faces xoz by determination respectively；
Distribution of the 1 each structure feature element of table in drop stamping beam-like part sample
| Structure feature element | U-shaped part | S-shaped beam | Flanged (FLGD) automobile front longitudinal beam inner panel | Automobile B-pillar inner plate |
| Straight wall (n1) | 2 | 0 | 2 | 2 |
| Curved surface sidewall (n2) | 0 | 2 | 0 | 2 |
| Straight top surface (n3) | 1 | 1 | 0 | 0 |
| Bent top surface (n4) | 0 | 0 | 1 | 1 |
| Boss (n5) | 0 | 0 | 0 | 3 |
S3, the drop stamping finite element model that each stamping parts is established by finite element method, as shown in Fig. 2, with automobile B-column
For inner panel, finite element model includes punch-pin 5, cavity plate 6 and the automobile B-pillar inner plate being set between punch-pin 5 and cavity plate 6
Blank 7 obtains the corrugation value of each stamping parts, as shown in table 2 as shown in figure 3, simulating the forming process of each stamping parts；
The corrugation value of 2 each stamping parts of table
| Part type | εwcj(%) | niαi |
| U-shaped part | 0.43 | 2α1+α3 |
| S-shaped beam | 2.42 | 2α2+α3 |
| Automobile front longitudinal beam inner panel | 6.46 | 2α1+α4 |
| Automobile B-pillar inner plate | 5.50 | 2α1+2α2+α4+3α5 |
S4, corrugation criterion is established：According to the generation principle and influence factor of wrinkle in the present embodiment, commented using corrugation criterion
Estimate the corrugation trend (corrugation risk) of drop stamping part sample, the stress-strain relation of thick anisotropy plate in the case of simple load
It is
Wherein, ε1It is plane principal strain, ε2It is plane time strain (referred to as time strain), εtIt is perpendicular to the master of board direction
Strain, R are average the coefficient of normal anisortopy, εiIt is equivalent strain, σiIt is equivalent stress；
Compression due to being parallel to plate face causes to wrinkle, generation and the secondary stress σ of wrinkle2It is related, according to public affairs
Formula (1) obtains
Wherein,Work as σ2When=0, plate is in unidirectional tension state, is with list in forming limit diagram
The form of axis draw line occurs, and line is uniaxially stretched as basic corrugation criterion using this, consider load history on it is corrugated influence with
And influence (the example of geometry size：Curved surface area material is typically to thicken rather than wrinkle), obtain corrugation criterion
Wherein, ρ is coefficient related with curvature, εwc>=0, work as εwcWhen=0, plate works as ε without corrugationwcWhen ＞ 0, plate has
Corrugation trend, the value the big, shows that plate corrugation trend is more serious；
S5, corrugation prediction model of the structure based on structure feature element：It establishes between each structure feature element and corrugation
Functional relation, the corrugation prediction model in relation to structure feature element can both be established by analytic method, and can also pass through people
The technologies such as artificial neural networks obtain, it is assumed that are simple between the corrugation trend and structure feature element coefficient of drop stamping beam-like part
Proportional relation, meet following functional relation：
Wherein k is proportionality coefficient, αiFor structure feature element coefficient, indicate corresponding structure feature element to corrugated tribute
It offers；
S6, bring the corrugation value of each stamping parts in step S3 into formula (4) respectively, obtain each structure feature element coefficient it
Between relationship,
Relational expression (5) is expressed in the form of slope in rectangular coordinate system, as shown in figure 4, can obtain, α2>α1>0,
α4>0, α3<0, α5<0, if αi>0, then it represents that corresponding structure feature element has a facilitation to corrugation, and when product design weakens
The structure feature element, if αi<0, then it represents that corresponding structure feature element has to corrugation and slows down effect, and when product design enhances
The structure feature element.
From relational expression (5) and Fig. 4：(1) side wall has facilitation to corrugation, and curved surface sidewall is on corrugated influence
Than facing the big of side wall directly, for this purpose, to prevent from wrinkling, when product design, focuses on side wall especially curved surface sidewall, if not being avoided that song
Surface side wall then can suitably increase boss structure, or suitably increase bead on die face；
(2) top surface is bigger on corrugated influence amplitude, but the mode of action is different, and straight top surface is unfavorable for the production of wrinkle
Raw, bent top surface can cause to wrinkle, for this purpose, to prevent from wrinkling, when product design suitably reduces bent top surface, if not being avoided that bent top
Face then can carry out predeformation so that plate can be contacted with die face in stamping process simultaneously to plate；
(3) boss, which has corrugation, significantly slows down effect, this is because boss has suction effect, thus can eliminate
Wrinkle, for this purpose, to prevent from wrinkling, when product design, increases boss.
Functional relation in the present invention between structure feature element and corrugation can intuitively reflect each structure feature element
On corrugated influence.The present invention is selected according to the difference of punching parts sample, and the function between structure feature element and corrugation closes
System also changes therewith, and therefore, this method has certain elasticity.
It should be understood that for those of ordinary skills, it can be modified or changed according to the above description,
And all these modifications and variations should all belong to the protection domain of appended claims of the present invention.
Claims (5)
1. a kind of corrugated prediction of stamping parts and control method, which is characterized in that include the following steps：
S1, multiple stamping parts with similar structural characteristics are chosen as analysis sample；
S2, the shape according to similar structural characteristics, the similar structural characteristics of each stamping parts are decomposed, and obtain constituting each punching press
The structure feature element 1 of part similar structural characteristics, 2,3 ..., the quantity n of n and each structure feature elementi, i=1,2,
3 ..., n, each stamping parts have one or more of identical structure feature elements, all structure feature elements of induction-arrangement；
S3, the punching press finite element model for establishing each stamping parts, simulate the forming process of each stamping parts, obtain each stamping parts
Corrugation value；
S4, corrugation criterion is established：The stress-strain relation of each stamping parts is
Wherein, ε1It is plane principal strain, ε2It is plane time strain, εtBe perpendicular to the principal strain of board direction, R be it is average it is thick to
Anisotropic coefficient, εiIt is equivalent strain, σiIt is equivalent stress；
Compression due to being parallel to plate face causes to wrinkle, generation and the secondary stress σ of wrinkle2It is related, according to formula (1)
It obtains
Wherein,Work as σ2When=0, plate is in unidirectional tension state, is drawn with single shaft in forming limit diagram
The form for stretching line occurs, and line is uniaxially stretched as basic corrugation criterion using this, considers that load history influences and several on corrugated
The influence of what geomery obtains corrugation criterion
Wherein, ρ is coefficient related with curvature, εwc>=0, work as εwcWhen=0, plate works as ε without corrugationwcWhen ＞ 0, plate has corrugation
Trend, the value the big, shows that plate corrugation trend is more serious；
S5, corrugation prediction model of the structure based on structure feature element：Establish the letter between each structure feature element and corrugation
Number relationship, it is assumed that it is simple proportional relation between the corrugation trend and structure feature element coefficient of drop stamping beam-like part, it is full
It is enough minor function relationship：
Wherein k is proportionality coefficient, αiFor structure feature element coefficient, indicate corresponding structure feature element to corrugated contribution；
S6, it brings the corrugation value of each stamping parts in step S3 into formula (4) respectively, obtains between each structure feature element coefficient
Relationship, if αi>0, then it represents that corresponding structure feature element has a facilitation to corrugation, and when product design weakens the structure feature
Element, if αi<0, then it represents that corresponding structure feature element has to corrugation and slows down effect, and when product design enhances the structure feature
Element, to control the generation of wrinkle.
2. the corrugated prediction of stamping parts according to claim 1 and control method, which is characterized in that described in step S1
It is beam-like part or thin wall component to analyze sample.
3. the corrugated prediction of stamping parts according to claim 1 and control method, which is characterized in that described in step S1
Analysis sample is 4 beam-like parts, respectively U-shaped part, S-shaped beam, flanged (FLGD) automobile front longitudinal beam inner panel and automobile B-pillar inner plate.
4. the corrugated prediction of stamping parts according to claim 3 and control method, which is characterized in that in step S2, own
Structure feature element includes straight wall, curved surface sidewall, straight top surface, bent top surface and boss, is respectively labeled as 1,2,3,4,5.
5. the corrugated prediction of stamping parts according to claim 1 and control method, which is characterized in that the stamping parts is cold
Stamping parts, warm stamping parts or heat-punch member.
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| CN114371078B (en) * | 2022-01-13 | 2024-02-09 | 马鞍山钢铁股份有限公司 | Stamping die acceptance method based on forming safety margin |
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| CN203888594U (en) * | 2014-04-17 | 2014-10-22 | 武汉华滋东江汽车零部件有限公司 | Automobile skylight reinforcing plate assembly |
| CN104765912A (en) * | 2015-03-25 | 2015-07-08 | 湖南大学 | Robustness optimizing method of aluminum plate punching process |
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| CN203888594U (en) * | 2014-04-17 | 2014-10-22 | 武汉华滋东江汽车零部件有限公司 | Automobile skylight reinforcing plate assembly |
| CN104765912A (en) * | 2015-03-25 | 2015-07-08 | 湖南大学 | Robustness optimizing method of aluminum plate punching process |
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