CN105891423B - A kind of method of macromolecule plate progressive molding limit test - Google Patents
A kind of method of macromolecule plate progressive molding limit test Download PDFInfo
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- CN105891423B CN105891423B CN201610244097.XA CN201610244097A CN105891423B CN 105891423 B CN105891423 B CN 105891423B CN 201610244097 A CN201610244097 A CN 201610244097A CN 105891423 B CN105891423 B CN 105891423B
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- progressive molding
- tapered cup
- macromolecule
- corrugation
- forming
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
Abstract
The invention belongs to macromolecule plate progressive molding field, specifically related to a kind of method of macromolecule plate progressive molding limit test, the present invention processes the substantially angular range of next clear and definite macromolecule sheet material forming corrugation failure first with spherical arc revolving body curved-surface piece, then recycles Tapered Cup to approach the final determination progressive molding limit.The present invention compared with prior art, has the advantages that：Occurs the forming limit that corrugation has reached sheet material invention defines the criterion that the corrugation of macromolecule plate is failed as progressive molding, i.e. sheet forming；Spherical arc revolving parts are approached into processing with Tapered Cup to be combined, the workload of macromolecule Sheet Metal Forming Limit angular measurement is considerably reduced；It compensate for the deficiency of tradition failure foundation to rupture as progressive molding, it is proposed that a kind of macromolecule plate progressive molding limiting angle accurate measurement method；Be conducive to popularization and application of the progressive molding technology in macromolecule sheet fabrication.
Description
Technical field
The invention belongs to macromolecule plate progressive molding field, and in particular to a kind of macromolecule plate progressive molding limit is surveyed
The method of examination, it is possible to use the method finds out the progressive molding limiting angle θ of macromolecule platemax, it is macromolecule sheet material progressive molding
Reference is provided.
Background technology
Plate progressive molding technology is a kind of Flexible Manufacturing Technology, is the Leszak by the U.S. earliest in the sixties in last century
Propose, the nineties is made further research by luxuriant husband in Japanese scholars Songyuan City etc. to the technology, gradually causes scholars'
Pay attention to.Advanced manufacturing technology of the progressive molding based on computer technology and Numeric Control Technology, it utilizes the thought of " Layered manufacturing ", will
The threedimensional model created is separated into two-dimensional contour shape, and export numerical control program carries out layering processing, is become using the part of plate
Shape is accumulated as final overall deformation.Progressive molding technology has the advantages such as high flexibility, low cost, high efficiency, required during shaping
Plastic force is small so the forming limit of plate can be increased substantially, and is a kind of sheet forming technology developed rapidly in recent years.
Progressive molding angle is any Working position profile tangent line and the angle of horizontal direction.Research thinks, sheet metal
Progressive molding belongs to detrusion, and its thickness change follows the cosine law and principle, i.e. δ=δ is thinned0* cos θ (wherein δ0It is sheet material
Original depth, θ is forming angle, and δ is the theoretic throat for shaping postforming angle θ positions), it is theoretical according to this, when workpiece processing
When producing rupture to some angle, θ, i.e., the forming limit angle θ using the angle as sheet material under the processing conditionsmax.At present, it is high
The progressive molding research of molecule plate is at home and abroad also in the starting stage, and such as Franzen et al. is real using progressive molding technology
The successful application of PVC board material is showed, and basic research is carried out to the progressive molding limit of PVC board material；Le et al. have studied gradually
Enter during forming test, the influence of different technological parameter to the PP progressive molding limit etc..But foregoing research is not all carried
Go out a kind of determination methods of the macromolecule sheet material progressive molding limit of system, limit progressive molding technology and add in macromolecule sheet material
Popularization and application in work.
It is broken in plate in progressive molding process because macromolecule sheet material work in-process is more sensitive to parameters such as temperature
It is easy to softening wrinkling occur before splitting, different from sheet metal to be broken into the judgment basis of progressive molding failure.
The content of the invention
In order to overcome drawbacks described above, the invention provides the macromolecule plate progressive molding to wrinkle to shape failure criteria
The method of limit test.Wrinkled in view of macromolecule plate failure mode for region, it is not easy to accurate to find out initial corrugation point, this
The substantially angular range for carrying out clear and definite macromolecule sheet material forming corrugation failure is processed in invention first with spherical arc revolving body curved-surface piece,
Then Tapered Cup is recycled to approach the final determination progressive molding limit, the present invention can go out the progressive of macromolecule sheet material with Validity Test
Forming limit angle θmax。
In order to realize foregoing invention purpose, a technical scheme of the present invention is：A kind of macromolecule plate is progressive
The method of forming limit test, it is characterised in that comprise the following steps：
(1) spherical arc revolution body Model is set up, and progressive molding numerical control code is generated according to model；
(2) clamping needs the macromolecule sheet material tested on progressive molding lathe, is opened with the numerical control code that step (1) is generated
Begin to process the spherical arc revolving body, stop processing when corrugation takes place in macromolecule sheet material workpiece, it is initial in workpiece
Corrugated regions optionally a bit, corrugation benchmark forming angle θ are used as using the forming angle of the pointJ；
(3) θ=θ is takenJCreate conical model and generate processing numerical control code, Tapered Cup is completed on progressive molding lathe
Progressive molding is processed, and wherein θ is Tapered Cup shape angles, and D is Tapered Cup mouth diameters in conical model, and H is Tapered Cup height；
(4) Tapered Cup after the processing that analytical procedure (3) is obtained, the D of conical model, H parameter constants, if after processing
Tapered Cup wrinkles, according toCreate new conical model and generate corresponding progressive molding numerical control code, directly
To processing unruffled Tapered Cup；If the Tapered Cup after processing does not wrinkle, according toCreate new
Conical model and generate corresponding progressive molding numerical control code, until there is corrugated Tapered Cup；Wherein n=1 ..., n are
The number of times and n of actual implementation Tapered Cup are incremented by the Tapered Cup up to processing the condition of satisfaction since 1；Δ θ is the corrugation of setting
Benchmark forming angle θJWith the forming limit angle θ of macromolecule sheet materialmaxBetween error range；
(5) the serial Tapered Cup that progressive molding processing is obtained in analytical procedure (4), takes minimum forming angle in corrugation Tapered Cup
θ, is the limit forming angle θ of this macromolecule sheet materialmax。
In step (4), Δ θ=(5%~10%) θJ。
In step (2), when macromolecule sheet material workpiece is processed, in the optional point P (X, Z) in initial corrugated regions, and will
The forming angle of the point is set to the benchmark forming angle that wrinkles, then wrinkle benchmark forming angle θJZ=Z in=arccos (Z/R), formulad- h, Zd
For drip molding height, h is the height at selected corrugation point, and R is spherical radius.
θ J are obtained according to the spherical arc revolving body corrugated regions of processing in step (1), the forming limit with sheet material
Angle θmaxBetween have certain error, then the angular error scope that Δ θ is to provide is added by follow-up Tapered Cup
Work it is more accurate find out θmax。
The present invention compared with prior art, has the advantages that：
(1) due to macromolecule and the difference of metal blank physical characteristic, there is also larger for the judgement standard of its failure mode
Difference, invention defines the criterion that the corrugation of macromolecule plate is failed as progressive molding, i.e. sheet forming takes place
Corrugation has reached the forming limit of sheet material；
(2) spherical arc revolving parts are approached into processing with Tapered Cup interpolation to be combined, considerably reduces macromolecule
Sheet Metal Forming Limit angle θmaxThe workload of test；
(3) it compensate for the deficiency of tradition failure foundation to rupture as progressive molding, it is proposed that a kind of macromolecule plate is gradually
Enter forming limit angle θmaxAccurate measurement method；
(4) popularization and application of the progressive molding technology in macromolecule sheet fabrication are conducive to.
Brief description of the drawings
Fig. 1 spherical arcs turn round body Model；
Fig. 2 Tapered Cup models.
Embodiment
The present invention is further described below by embodiment.
According to Fig. 1-2, a kind of method of macromolecule plate progressive molding limit test, it is characterised in that including following step
Suddenly：
(1) spherical arc revolution body Model is set up, and progressive molding numerical control code is generated according to model；As shown in figure 1,
Spherical arc revolution body Model is obtained using radius as the rotation of R circular arc on the CAD platforms such as UG, and according to the model with progressive molding
The corresponding shaping numerical control code of tool heads amount of feeding generation (in following steps the method for generation shaping numerical control code with this step
It is identical)；ZC, XC refer to the central coordinate of circle that radius is R circular arcs, and R refers to spherical radius.By taking Fig. 1 as an example, obtained ball is rotated by circular arc
Shape cambered surface turns round body Model, because tangent line and the horizontal direction angle of sphere different height position are the forming angle of the position,
Different forming angles can be obtained using a model.In the optional point P (X, Z) in the initial corrugated regions of spherical partses in processing,
And the forming angle of the point is set to the benchmark forming angle that wrinkles, then wrinkle benchmark forming angle θJ=arccos (Z/R) (Z=Z in formulad-
H, ZdFor drip molding height, h is the height at selected corrugation point, and R is spherical radius).
(2) clamping needs the macromolecule sheet material tested on progressive molding lathe, is opened with the numerical control code that step (1) is generated
Begin to process the spherical arc revolving body, stop processing when corrugation takes place in macromolecule sheet material workpiece, it is initial in workpiece
Corrugated regions optionally a bit, corrugation benchmark forming angle θ are used as using the forming angle of the pointJ；
(3) θ=θ is takenJCreate conical model (easily obtaining the model on the CAD platforms such as UG) and according to the conical model
Corresponding processing numerical control code is generated with the progressive molding tool heads amount of feeding and completed on progressive molding lathe adding for Tapered Cup
Work, as shown in Fig. 2 D is Tapered Cup mouth diameters in Tapered Cup shape angles of the wherein θ for setting, conical model, H is taper
Part height；
(4) Tapered Cup after the processing that analytical procedure (3) is obtained, the D of conical model, H parameter constants, if after processing
Tapered Cup wrinkles, according toCreate new conical model and generate corresponding progressive molding by foregoing method
Numerical control code, until processing unruffled Tapered Cup；If the Tapered Cup after step (3) processing does not wrinkle, press
According toCreate new conical model and generate corresponding progressive molding numerical control code, until processing obtains corrugated cone
Shape part；Wherein n=1,2 ..., n are incremented by up to processing the condition of satisfaction for the number of times and n of actual implementation Tapered Cup since 1
Tapered Cup；Δ θ is the corrugation benchmark forming angle θ setJWith the forming limit angle θ of macromolecule sheet materialmaxBetween error model
Enclose；θ in step (4) is the shape angles of the new corresponding Tapered Cup of conical model；Specifically, when adding that step (3) is obtained
Tapered Cup after work wrinkles, according toCreate new conical model and corresponding gradually by foregoing method generation
Enter and shape numerical control code, first take n=1, i.e., according to formula θ=(θJ- Δ θ) new conical model and processing are built, what is obtained adds
If workpiece is wrinkle resistant, limit forming angle (θ may determine thatJ-Δθ)<θmax<θJApproached with n increases according to interpolation and find θmax；
The Tapered Cup after processing that step (3) is obtained does not wrinkle, when taking n=1, and if it happens obtained workpiece wrinkles,
It then may determine that limit forming angle θJ<θmax<(θJ+ Δ θ) approached with n increases according to interpolation and find θmax；
(5) the serial Tapered Cup that progressive molding processing is obtained in analytical procedure (4), takes minimum shaping in corrugation Tapered Cup
Angle θ, (i.e. in n times is processed, taking the minimum value of forming angle θ in corrugation Tapered Cup), then it is believed that θ is this macromolecule sheet material
Limit forming angle θmax。
In step (4), preferably Δ θ=(5%~10%) θJ。
Described above is only the preferred embodiment of the present invention, it should be pointed out that：For the ordinary skill people of the art
For member, under the premise without departing from the principles of the invention, some improvement and the replacement of equivalents can also be made, these improvement
The technical scheme obtained with equivalent substitution should also belong to protection scope of the present invention.
Claims (3)
1. a kind of method of macromolecule plate progressive molding limit test, it is characterised in that comprise the following steps：
(1) spherical arc revolution body Model is set up, and progressive molding numerical control code is generated according to model；
(2) clamping needs the macromolecule sheet material tested on progressive molding lathe, and the numerical control code generated with step (1) starts to add
The work spherical arc revolving body, stops processing when corrugation takes place in macromolecule sheet material workpiece, is initially wrinkled in workpiece
Region optionally a bit, corrugation benchmark forming angle θ is used as using the forming angle of the pointJ；
(3) θ=θ is takenJCreate conical model and generate processing numerical control code, the progressive of Tapered Cup is completed on progressive molding lathe
Forming, wherein θ is Tapered Cup shape angles, and D is Tapered Cup mouth diameters in conical model, and H is Tapered Cup height；
(4) Tapered Cup after the processing that analytical procedure (3) is obtained, the D of conical model, H parameter constants, if the taper after processing
Part wrinkles, according toCreate new conical model and generate corresponding progressive molding numerical control code, until plus
Work goes out unruffled Tapered Cup；If the Tapered Cup after processing does not wrinkle, according toCreate new circle
Based On The Conic Model simultaneously generates corresponding progressive molding numerical control code, until there is corrugated Tapered Cup；Wherein n=1 ..., n are actual
The number of times and n of structure Tapered Cup are incremented by the Tapered Cup up to processing the condition of satisfaction since 1；Δ θ is the corrugation benchmark of setting
Forming angle θJWith the forming limit angle θ of macromolecule sheet materialmaxBetween error range；
(5) the serial Tapered Cup that progressive molding processing is obtained in analytical procedure (4), takes minimum forming angle θ in corrugation Tapered Cup, i.e.,
For the limit forming angle θ of this macromolecule sheet materialmax。
2. the method for a kind of macromolecule plate progressive molding limit test according to claim 1, it is characterised in that in step
Suddenly in (4), Δ θ=(5%~10%) θJ。
3. the method for a kind of macromolecule plate progressive molding limit test according to claim 1, it is characterised in that in step
Suddenly in (2), when macromolecule sheet material workpiece is processed, in the optional point P (X, Z) in initial corrugated regions, and by the forming angle of the point
It is set to corrugation benchmark forming angle θJ, then wrinkle benchmark forming angle θJZ=Z in=arccos (Z/R), formulad- h, ZdIt is high for drip molding
Degree, h is the height at selected corrugation point, and R is spherical radius.
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106825212B (en) * | 2017-02-15 | 2018-07-20 | 青岛理工大学 | A kind of judgment method of multidirectional paddle type mill progressive molding plate rupture |
| CN110465584B (en) * | 2019-08-05 | 2020-11-10 | 南京工程学院 | Progressive forming limit test method for mesh plate |
| CN112528424A (en) * | 2020-11-03 | 2021-03-19 | 南京工程学院 | Method for improving incremental forming performance of plate |
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| CN103940681A (en) * | 2014-03-24 | 2014-07-23 | 南京工程学院 | Metal plate multi-pass incremental forming and limit forming performance testing method |
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| CN103940681A (en) * | 2014-03-24 | 2014-07-23 | 南京工程学院 | Metal plate multi-pass incremental forming and limit forming performance testing method |
| CN105138747A (en) * | 2015-08-07 | 2015-12-09 | 南京工程学院 | STL file format based main progressive forming direction determination method |
| CN105136589A (en) * | 2015-08-14 | 2015-12-09 | 南京工程学院 | Method for testing forming limit of tailor welded blank during metal plate incremental forming |
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