CN101050960A - Analogue method for punching mould structure analysis value - Google Patents
Analogue method for punching mould structure analysis value Download PDFInfo
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- CN101050960A CN101050960A CN 200710040000 CN200710040000A CN101050960A CN 101050960 A CN101050960 A CN 101050960A CN 200710040000 CN200710040000 CN 200710040000 CN 200710040000 A CN200710040000 A CN 200710040000A CN 101050960 A CN101050960 A CN 101050960A
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Abstract
A method for simulating analysis figure of punching press mould structure includes obtaining contact force between deformed plate material and surface of model in punching press process, simplifying 3-D CAD model of mould and making discretion be body unit with certain mass and certain control total amount, exerting obtained contact force on surface node of body unit use for simulating mould structure analysis figure, finalizing analysis finite element model of mould structure and providing it to resolver for solving out result.
Description
Technical field
What the present invention relates to is the analogy method in a kind of Computer Applied Technology field, particularly a kind of analogue method for punching mould structure analysis value.
Background technology
Mould plays important effect in the metal forming process.In order to satisfy the light-weighted requirement of automobile, the strength grade of automotive sheet is more and more higher, and the 2-3 when mould load is the ordinary steel punching press during high-strength steel stamping times, traditional cladding element punch mould design criteria differs and satisfies the high-strength steel stamping requirement surely.Merely increase the volume and the thickness of mould, select the higher mold materials of hardness for use, will inevitably increase the energy consumption in mold materials cost and the production, and sometimes can not play Expected Results.The high-strength steel stamping mould is carried out intensity, rigidity check, life prediction and further structure optimization, press for a kind of analogy method of quantification.
Find by prior art documents, " the Analysis of the elastic characteristics at die and workpieceto improve the dimensional accuracy for cold forged part " that the Y.S.Lee of Korea S etc. delivered on the 153-154 phase 1081-1088 page or leaf at " Journal of MatrerialProcessing Technology " (material forming technology journal) in 2004 (elastic deformation of analyzing mould and workpiece is to improve the dimensional accuracy of cold forging spare), propose in this article to regard workpiece as elasticoplastic body, die in the mould is considered as rigid body, drift is considered as elastic body, with Numerical Method Study the elastic deformation of cold-forging die, to consider the influence of die deformation to the workpiece size precision, its deficiency is: this method is under present software and hardware level, can only simulate as simple part formings such as rotational symmetry, big and the complex structure of the common volume of cladding element punch mould is difficult to realize with the method.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, a kind of analogue method for punching mould structure analysis value is provided, make its under current software and hardware level for the check of diel intensity and toughness, life prediction and further structure optimization a kind of feasible, believable method for numerical simulation is provided, in order to instruct mould design and punching production.
The present invention is achieved by the following technical solutions, and concrete steps of the present invention are as follows:
1. carry out sheet metal forming numerical simulation, from mould three-dimensional CAD (computer-aided design (CAD)) model, extract mould (punch, die and blank holder) profiled surface, import in the finite element pre-processing software (as commercial finite element pre-processing software HyperMesh), after the die forming surface simplified, adopt the method for controlling the action difference that the instrument profiled surface is dispersed and be shell unit, select the solver of method of addition finite element code (as commercial finite element solving software Ls-Dyna) for use as sheet metal forming numerical simulation, determine billet size and it carried out grid discrete, after finishing according to the requirement setting of solver, from the finite element pre-processing software, derive finite element solving device input file, submitting to the finite element solving device then finds the solution, find the solution finish after, use the poster processing soft (as commercial finite element the poster processing soft HyperView) logarithm value analog result to observe, obtain being out of shape the contact action power between plate and the die forming surface;
2. the mould three-dimensional CAD model is imported in the finite element pre-processing software, at first the mould three-dimensional CAD model is simplified, the mould three-dimensional CAD model after the simplification will satisfy following A, B, 3 requirements of C simultaneously:
It is discrete that mould three-dimensional CAD model after A simplifies will be convenient to that it is carried out body unit, and discrete body unit will satisfy enterprise's finite element analogy element quality requirement,
Mould three-dimensional CAD model after B simplifies, the body unit quantity after discrete will be in pattern of enterprises analysis finite element software and hardware processing poweies,
C reduces the mould three-dimensional CAD model and simplifies degree on the basis of satisfying 2 of above A, B,
Requirement according to three of above A, B, C, mould three-dimensional CAD model after simplifying is carried out body unit to disperse, be selected to the finite element solving device (as commercial finite element software Marc) of die structure analysis, after finishing according to the requirement setting of solver, derive finite element solving device input file, finite element model does not at this moment also comprise the interaction between distortion plate and the die forming surface;
3. will 1. go on foot distortion plate that sheet metal forming numerical simulation obtains and the contact action power between the die forming surface and be applied to the body unit surface node that is used for the die structure analysis numerical simulation that 2. step obtains, because the mould three-dimensional CAD model was simplified discrete different with grid when the simplification of die forming surface was dispersed with die structure analysis numerical simulation finite element modeling with grid during the sheet metal forming numerical simulation finite element modeling, so 1. go on foot the body unit surface that is used for the die structure analysis numerical simulation that shaping plate that sheet metal forming numerical simulation draws and the contact action power between the die surface may be obtain in 2. step, need 1. to go on foot shaping plate that sheet metal forming numerical simulation draws and the contact action power between the die surface and be applied to the body unit surface node that is used for the die structure analysis numerical simulation that 2. step obtains, as force boundary condition to replace the interaction between the plate and die surface in the actual forming process, specifically by following A, B, three steps of C realize:
A moves to the point of load on the die surface grid in the sheet metal forming numerical simulation apart from its nearest body unit surface that is used for the die structure analysis numerical simulation,
B will move to the lip-deep load of body unit and be interpolated on the node of body unit surface,
C rewrites and 2. goes on foot the finite element solving device input file that obtains according to the format specification of die structure analysis numerical simulation finite element solving device input file, increases the load that acts on the node of body unit surface;
4. will 3. go on foot and replenish the finite element solving device input file that is used for the die structure analysis numerical simulation finish and be submitted to the finite element solving device that is used for the die structure analysis numerical simulation and find the solution, find the solution finish after, adopt the poster processing soft (as commercial finite element the poster processing soft Mentat) that the result is carried out observation analysis, if do not meet required result, find out reason, if because 1. go on foot the load mistake that sheet metal forming numerical simulation obtains, turn back to the 1. step, if because 2. the discrete body unit quality that is used for die structure analysis that obtains of step is poor excessively, turn back to the 2. step, so circulation is until obtaining required result.
The present invention uses sheet metal forming numerical simulation to obtain the interaction force between the plate and mould in the forming process, when carrying out the die structure analysis numerical simulation, this acting force is applied to the mold cell surface, forms panel load to replace the interaction between distortion plate and the die surface.This disposal route has been simplified the complexity of problem greatly, and finite element modeling method on the table top is installed than overall shaping load is applied to mould and pressing machine as even distributed force, this method mould is stressed more approaching with actual condition, hyperbolic bottom surface Box-Shaped Drawing mould to design carries out numerical simulation with this method, and carried out verification experimental verification, the measured result of equivalent stress and numerical simulation result error are no more than 15% on the mould, show that this method is a kind of real effective ways that carry out complicated punching mould structure analysis at present.
Description of drawings
Fig. 1 is the inventive method process flow diagram
Embodiment
Below in conjunction with accompanying drawing embodiments of the invention are elaborated: present embodiment has provided detailed embodiment and process being to implement under the prerequisite with the technical solution of the present invention, but protection scope of the present invention is not limited to following embodiment.
Present embodiment is that hyperboloid, vertical wall section three sides are the plane with a bottom surface, and a side is that the Box-Shaped Drawing mould of curved surface is an example, simulates its stress and distortion, and has carried out corresponding test to verify validity of the present invention.
Concrete steps are as follows:
1. carry out sheet metal forming numerical simulation, from the three-dimensional UG (Unigraphics of mould, a kind of three-dimensional CAD software) extract the profiled surface of mould in the model, import in the HyperMesh software, after the die forming surface simplified, adopt method (the largest chord discrepancy in elevation 0.1mm of control action difference, minimum cell size 0.5mm, largest unit size 30mm) the instrument profiled surface being dispersed is shell unit, select the solver of Ls-Dyna software as sheet metal forming numerical simulation for use, plate is of a size of 240 * 200mm
2It is carried out grid disperses, requirement according to solver, set the material property parameter of plate, plate cell type and integration scheme, behind the contact relation between instrument and the blank and the moving condition of instrument etc., from HyperMesh software, derive the Ls-Dyna input file, submitting to Ls-Dyna then finds the solution, find the solution finish after, use HyperView logarithm value analog result to observe, analyze, present commercial sheet metal forming numerical simulation software is quite ripe, the sheet thickness of simulation changes the thickness of workpiece variation that draws with test and coincide good, the punch plastic force of simulation is consistent with the drift plastic force trend of gathering on the MTS forming machine, and relative error is less than 10%;
2. the three-dimensional UG model of mould is imported in the HyperMesh software, at first the mould three-dimensional CAD model is simplified, simplify the chamfering of falling in the mold component, the screw hole that is used to assemble, size is less than the geometric properties such as reinforcement of 5mm, then it is dispersed and be hexahedral element, element quality more than 95% satisfies: warpage is less than 12.0, Jacobi is greater than 0.7, aspect ratio is less than 5.0, deflection is less than 60.0, hexahedral element adds up to 140,000 7 thousand, node adds up to 150,000 4 thousand, element quality satisfies general enterprise finite element analysis quality requirements, and the unit sum is in the processing power of finite element software Marc.After grid is discrete,, set the material property of instrument, after contact relation, displacement boundary conditions, load boundary condition and load step etc. between each parts of instrument, derive the Marc input file according to the requirement of Marc software;
3. will 1. go on foot distortion plate that sheet metal forming numerical simulation obtains and the contact action power between the die forming surface and be applied to the body unit surface node that is used for the die structure analysis numerical simulation that 2. step obtains, adopt VC (Visual Studio, a kind of program development tools) the load mapping tool-LoadMapping that writes (load mapping, the instrument that is used for the load mapping of user's exploitation), with the sheet metal forming numerical simulation gridding information, die structure analysis numerical simulation gridding information, 1. go on foot destination file that sheet metal forming numerical simulation obtains and 2. the Marc input file that obtains of step be input, computing, processing obtains new Marc input file, has increased the point load that acts on instrument hexahedral element profiled surface node in the new Marc input file;
4. will 3. go on foot the Marc input file that obtains and be submitted to the Marc solver and find the solution, find the solution finish after, adopt Mentat software that the result is observed.
In order to verify the validity of this method, developed punching mould structure analysis stress, strain acquisition system, this system comprises the hyperbolic bottom surface Box-Shaped Drawing mould after the repacking, electric bridge box, the dynamic digital strainmeter, the data acquisition software based on Windows of data acquisition card and exploitation.Carried out the drawing experiments of two kinds of plates under the constant pressure-pad-force of difference, test findings shows, to each test situation, the measured result of equivalent stress and numerical simulation result error are no more than 15% on the mould, it is simple that this method has a model, calculating the advantage of small scale, is a kind of reality, the effective ways that under the present software and hardware level complicated diel carried out structure analysis.
The scope of application of the present invention is not limited to punching mould structure analysis, and similarly step can be applicable to as forging extrusion die (comprise, be not limited to) structure analysis.This method also is used for car floor component punching mould structure analysis, and identical step and operating process have obtained good effect equally.
Claims (9)
1, a kind of analogue method for punching mould structure analysis value is characterized in that, concrete steps are as follows:
1. carry out sheet metal forming numerical simulation, from the mould three-dimensional CAD model, extract the profiled surface of mould, import in the finite element pre-processing software, after the die forming surface simplified, adopt the method for controlling the action difference that the instrument profiled surface is dispersed and be shell unit, select the solver of method of addition finite element code for use as sheet metal forming numerical simulation, determine billet size and it carried out grid discrete, after finishing according to the requirement setting of solver, from the finite element pre-processing software, derive finite element solving device input file, submitting to the finite element solving device then finds the solution, find the solution finish after, use the poster processing soft logarithm value analog result to observe, obtain being out of shape the contact action power between plate and the die forming surface;
2. the mould three-dimensional CAD model is imported in the finite element pre-processing software, at first the mould three-dimensional CAD model is simplified, mould three-dimensional CAD model after simplifying is carried out body unit to disperse, be selected to the finite element solving device of die structure analysis, after finishing according to the requirement setting of solver, derive finite element solving device input file, obtain being used for the body unit surface node of die structure analysis numerical simulation, finite element model does not at this moment also comprise the interaction between distortion plate and the die forming surface;
3. will 1. go on foot distortion plate that sheet metal forming numerical simulation obtains and the contact action power between the die forming surface and be applied to the body unit surface node that is used for the die structure analysis numerical simulation that 2. step obtains, to replace the interaction between the plate and die surface in the actual forming process, obtain replenishing the finite element solving device input file of finishing that is used for the die structure analysis numerical simulation as force boundary condition;
4. will 3. go on foot and replenish the finite element solving device input file that is used for the die structure analysis numerical simulation finish and be submitted to the finite element solving device that is used for the die structure analysis numerical simulation and find the solution, find the solution finish after, adopt the poster processing soft that the result is carried out observation analysis, if do not meet required result's, find out reason, if because 1. go on foot the load mistake that sheet metal forming numerical simulation obtains, turn back to the 1. step, if because 2. the discrete body unit quality that is used for die structure analysis that obtains of step is poor excessively, turn back to the 2. step, so circulation is until obtaining required result.
2, analogue method for punching mould structure analysis value according to claim 1 is characterized in that, the described profiled surface that extracts mould in 1. is meant: the profiled surface that extracts punch, die and blank holder.
3, analogue method for punching mould structure analysis value according to claim 1 is characterized in that, described 1. middle finite element pre-processing software is meant commercial finite element pre-processing software HyperMesh.
4, analogue method for punching mould structure analysis value according to claim 1 is characterized in that, describedly selects method of addition finite element code for use in 1., is meant: select commercial finite element solving software Ls-Dyna for use.
5, analogue method for punching mould structure analysis value according to claim 1 is characterized in that, described 1. middle the poster processing soft is meant as commercial finite element the poster processing soft HyperView.
6, analogue method for punching mould structure analysis value according to claim 1 is characterized in that, the mould three-dimensional CAD model behind described 2. middle the simplification will satisfy following A, B, 3 requirements of C simultaneously:
It is discrete that mould three-dimensional CAD model after A simplifies will be convenient to that it is carried out body unit, and discrete body unit will satisfy enterprise's finite element analogy element quality requirement,
Mould three-dimensional CAD model after B simplifies, the body unit quantity after discrete will be in pattern of enterprises analysis finite element software and hardware processing poweies,
C reduces the mould three-dimensional CAD model and simplifies degree on the basis of satisfying 2 of above A, B,
According to the requirement of three of above A, B, C, it is discrete that the mould three-dimensional CAD model after simplifying is carried out body unit.
7, analogue method for punching mould structure analysis value according to claim 6 is characterized in that, among the described B, is used for the finite element solving device of die structure analysis, is meant commercial finite element software Marc.
8, analogue method for punching mould structure analysis value according to claim 1 is characterized in that, and is described 3. specifically by following A, B, three steps realizations of C:
A moves to the point of load on the die surface grid in the sheet metal forming numerical simulation apart from its nearest body unit surface that is used for the die structure analysis numerical simulation,
B will move to the lip-deep load of body unit and be interpolated on the node of body unit surface,
C rewrites and 2. goes on foot the finite element solving device input file that obtains according to the format specification of die structure analysis numerical simulation finite element solving device input file, increases the load that acts on the node of body unit surface.
9, analogue method for punching mould structure analysis value according to claim 1 is characterized in that, the described 4. middle the poster processing soft that adopts is meant and adopts commercial finite element the poster processing soft Mentat.
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