CN101789031B - Progressive die belt designing system based on pressure center optimization - Google Patents
Progressive die belt designing system based on pressure center optimization Download PDFInfo
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Abstract
The invention discloses a progressive die belt designing system based on pressure center optimization. The system is used for optimizing the deflection between the belt pressure center and the mould center to reduce the torque deflection of the mould center by the stamping force. A stamping force optimizing designing module is used for determining a convex die stamping component force and the mould stamping force. A belt layout optimizing designing module is used for solving the function of the pressure center deflection value and the stroke of different layout schemes, and judging the optimum layout scheme according to the integral average value on the stroke by the function. A belt deflection optimizing designing module is used for solving the function of the mould torque deflection value and the stroke, and determining the optimum belt deflection value when the integral of the function on the stroke is zero. The invention can design the optimum layout scheme for the pressure center, and solve the optimum belt deflection value to reduce the torque deflection caused by pressure center deflection in the stamping process.
Description
Technical field
The present invention relates to the design system of a kind of progressive die belt stock layout, the skew of band material, belong to metal stamping shaping field, be particularly useful for work step length or the more continuous punching press progressive die of sheet metal component of station number based on Center of Pressure optimization.
Background technology
Progressive die is in a secondary mould, is divided into several equidistant stations by the formed thereby part, and certain stamping procedure is set on each station, and certain that finish punching parts is partially-formed, is widely used in during modern industry produces.
The Center of Pressure of progressive die is meant the point of resultant force (hereinafter to be referred as the Center of Pressure) of progressive die each station stamping power when punching press, when mould designs, should guarantee that Center of Pressure and punch press press ram center keep aliging as far as possible.Otherwise slide block can bear eccentric load during punching press, causes the irregular wear of slide block guide rail and mould targeting part, influences parts quality and reduces die life even mold damage.
The method of optimizing centre-of-pressure position change stock layout, increase idle station and off-centring method etc.At present, the optimization of Center of Pressure research mainly concentrated on use optimized Algorithm to seek only layout project and off-centring, make Center of Pressure and press ram center be tending towards overlapping.
The scholar Lin of Taiwan University of Science and Technology, Deng use genetic algorithm and simulated annealing is optimized stock layout, to determine Center of Pressure and the immediate layout project in press ram center, though effectively reduced the skew of Center of Pressure, but following a few point defect is arranged: 1) adopt experimental formula to calculate punching press value with joint efforts, but in fact punching press is not a steady state value with joint efforts in punching course; 2) each the initial moment of punch punching press on the different station is assumed to identical, does not consider the precedence of the initial punching press of each punch; 3) owing to the restriction of mould process condition, can only be offset less band material to the Center of Pressure and carry out sample layout optimizing.
In punching course, the non-constant Center of Pressure of making a concerted effort because of punching press can change, and should guarantee the scope that torque offset that the skew of Center of Pressure causes does not exceed mould and allowed.The Chen Wei of Jiangsu University, Wang Juan etc. propose the Center of Pressure optimization method based on torque balance and numerical simulation, though the Center of Pressure has been defined the raising and the theoretical breakthrough of accuracy, optimization to the Center of Pressure has also had preliminary discussion, but following two point defects are arranged: 1) considered the situation of change of punch punching press component with stroke, but when definite punching press is made a concerted effort, do not consider different operations shifting to an earlier date and hysteresis when punching press, but be assumed to be each operation punching press reference position identical, the calculating of pressure force of liquidating is accurate inadequately, reliable reference is provided for the selection of pressing machine, finding the solution also of Center of Pressure caused a deviation; 2) though the Center of Pressure had optimize, can not provide the judgment criteria of optimum off-set value, only provide deviation range and offset direction.
As mentioned above, at present the multi-station progressive die Center of Pressure determine and optimize all have limitation, press in the engineering and accurately find the solution the Center of Pressure, with correctly, effectively it is optimized, thereby in punching production, play practical function.
Summary of the invention
In order to overcome above-mentioned defective, the invention provides a kind of progressive die belt designing system of optimizing based on the Center of Pressure, this invention is under the prerequisite of reasonable process conditions and mould structure, with numerical simulation, (CAD is computer-aided design (CAD) to CAD → CAE that torque balance and optimization method combine → CAD, CAE is a computer-aided engineering) integrated system, the band material off-set value of the torque offset optimum that is used to determine to make the layout project of Center of Pressure optimum and causes, can accelerate progressive die belt stock layout design process, reduce the eccentric load that mould produces in punching course, improve die life.
The present invention for the technical scheme that solves its technical matters and adopt is:
A kind of progressive die belt designing system of optimizing based on the Center of Pressure, form by stamping press optimal design module, band material sample layout optimizing design module and band material skew optimal design module, band material sample layout optimizing design module connects the output of stamping press optimal design module, the output of band material skew optimal design module connecting band material sample layout optimizing design module; Stamping press optimal design module is determined punch punching press component and mould stamping press; Band material sample layout optimizing design module is found the solution the Center of Pressure off-set value of different layout project and the function of stroke, and according to above-mentioned function the integral mean value of stroke is passed judgment on out optimum layout project; Band material skew optimal design module is found the solution the torque offset value of mould and the function of stroke, and the optimum band material off-set value when determining that above-mentioned function is zero to the stroke integration.
Described stamping press optimal design module determines that the method that punch punching press component and mould stamping press are adopted is: the method for using single station multiple operation numerical simulation and multistation list operation numerical simulation to combine, determine the punch punching press component and the mould stamping press that change with the slide block punching stroke; And under the situation of considering above-mentioned punch punching press component, mould stamping press and pressing machine permission stamping press, determine the precedence of the initial punching press of each punch.According to the station that can exchange, use the permutations and combinations principle and determine feasible layout project.
Described band material sample layout optimizing design module is found the solution the Center of Pressure off-set value of different layout project and the function of stroke, and according to above-mentioned function the integral mean value of stroke is passed judgment on out the optimum method that layout project adopted and be: each feasible layout project is found the solution Center of Pressure off-set value with changes stroke, and to above-mentioned Center of Pressure off-set value through monobasic repeatedly match draw the function of Center of Pressure off-set value and stroke, and solve the integral mean value of above-mentioned function to stroke, what determine integral mean value minimum in all layout project with this is optimum stock layout.
Described band material skew optimal design module is found the solution the torque offset value of mould and the function of stroke, and the method that the optimum band material off-set value when determining that above-mentioned function is zero to the stroke integration is adopted is: numerical simulation method and torque balance principle combine, calculate torque offset value with the mould of changes stroke, and to above-mentioned torque offset value through monobasic repeatedly match draw the function of torque offset value and stroke, application constraint optimization method and infinitesimal analysis principle, the torque offset value when calculating the above-mentioned function of sening as an envoy to the integrated value of stroke being zero is optimum band material off-set value.
The invention has the beneficial effects as follows:
1) considered that punching press makes a concerted effort with the variation of the stroke influence to the Center of Pressure, and done quantitative test;
2) considered with the influence of the Center of Pressure drift condition of changes stroke, and done quantitative test the mould torque offset;
3) to the assessment of optimum stock layout, with the optimum of Center of Pressure as judgment criteria, for the offset design of band material provides precondition;
4) to the assessment of band material skew, with the mould torque offset optimum of changes stroke as judgment criteria, instruct for Mould design provides the most directly;
5) band material stock layout and the integrated design of band material skew as optimization method to the Center of Pressure, to the limitation of Mould's Pressure Center optimization, make to be subjected to the restrictive condition of mould process littler when having reduced the two and separately using.
Description of drawings
Fig. 1 is a principle schematic of the present invention;
Fig. 2 is a workflow diagram of the present invention;
Fig. 3 is each punch punching press component variation diagram of stamping press optimal design module of the present invention;
Fig. 4 is the mould stamping press variation diagram of stamping press optimal design module of the present invention;
Fig. 5 is the pressing machine authouized pressure synoptic diagram of stamping press optimal design module of the present invention;
Fig. 6 is a band material of the present invention Center of Pressure off-set value synoptic diagram;
Fig. 7 is a mould torque offset value synoptic diagram of the present invention.
Embodiment
Embodiment: as shown in Figure 1, a kind of progressive die belt designing system of optimizing based on the Center of Pressure, form by stamping press optimal design module 1, band material sample layout optimizing design module 2 and band material skew optimal design module 3, band material sample layout optimizing design module 2 connects the output of stamping press optimal design module 1, the output of band material skew optimal design module 3 connecting band material sample layout optimizing design modules 2 has formed the band material Design CAD → CAE → CAD integrated system (CAD computer-aided design (CAD), CAE computer-aided engineering) based on finite element analogy and Center of Pressure optimisation technique.Wherein, stamping press optimal design module 1 is determined punch punching press component and mould stamping press; Band material sample layout optimizing design module 2 is found the solution the Center of Pressure off-set value of different layout project and the function of stroke, and according to above-mentioned function the integral mean value of stroke is passed judgment on out optimum layout project; Band material skew optimal design module 3 is found the solution the torque offset value of mould and the function of stroke, and the optimum band material off-set value when determining that above-mentioned function is zero to the stroke integration.
The workflow of stamping press optimal design module 1 of the present invention, band material sample layout optimizing design module 2 and 3 three modules of band material skew optimal design module and interconnected relationship are elaborated it as shown in Figure 2 below:
One, based on the stamping press optimal design module 1 input sheet metal part of finite element simulation, output punch punching press component and mould stamping press and feasible band material layout project mainly may further comprise the steps:
1) adopt the finite element algorithm for inversion that sheet metal part is carried out size and launch, and the operational characteristic of analytic band material.
2) analytic band material operational characteristic and preliminary stock layout, band material to preliminary stock layout carries out the finite element stamping simulation, use the modeling and the analogy method of single station multiple operation, output punch punching press component (is only got two punch) with the change curve of stroke in this example shown among Fig. 34,5; Use the modeling and the analogy method of multistation list operation, the output mask punching press is made a concerted effort with the curve of changes stroke, shown among Fig. 46.Wherein, single station multiple operation finite element modeling is that the forming technology of a certain station is set up punch-die finite element grid model, is used to find the solution punch punching press component value; Multistation list operation finite element modeling is that a punching course is set up the finite element grid model, set up protruding, the die grid model of a plurality of stations during modeling according to Sheet Metal Forming Technology, make the realistic progressive die punching course of progressive die punching course of simulation, be used to find the solution the mould stamping press.
3) shown in Fig. 4,5, will be by the mould stamping press change curve of exporting after the multistation list operation modeling Simulation 6, on the corresponding travel position 7, whether the check stamping press exceeds pressing machine authouized pressure scope 8 when corresponding to the pressing machine punching press.As exceed, can be 9 by the initial stroke position of punching press of adjusting punch 5, the mould stamping press curve 10 after changing by the output of multistation list operation modeling Simulation once more satisfies the pressing machine tolerance band so that adjusted stamping press corresponds on the punching stroke 11.
4) definite station number that can exchange uses combination and arrangement principle to determine feasible layout project number (only getting wherein two kinds of schemes in this example).
Two, band material sample layout optimizing design module 2 is the data that obtain in the input stamping press optimal design module 1, and the band material layout project that output is optimum mainly may further comprise the steps:
1) the band material and the punch punching press component of the different layout project determined of input stamping press optimal design module 1.
2) to each layout project, make punch punching press component the mold center torque balance is calculated, obtain the change curve of the off-set value of Center of Pressure, and be above-mentioned curve fitting repeatedly functional relation of monobasic with stroke.Curve 12,13 is function curve f1 (s), the f2 (s) that the Center of Pressure off-set value of two kinds of different layout project obtains through over-fitting among Fig. 6.
3) find the solution the integral mean value of above-mentioned function to variable (stroke), the layout project of output integral mean value minimum is optimum stock layout.E12, E13 are respectively the integral mean value of 12,13 pairs of strokes of function curve among Fig. 6, because E13＜E12, so the layout project of 13 correspondences is better than the layout project of 12 correspondences.
Three, the band material is offset the optimum band material stock layout that optimal design module 3 input tape material sample layout optimizing design modules 2 are determined, the optimum off-set value of output band material mainly may further comprise the steps:
1) the optimum layout project exported of input tape material sample layout optimizing design module 2 is calculated the permission torque offset scope that its mould can bear and is [M
Diff, M
Diff], shown among Fig. 7 14,15.
2) the band material is offset, the punch stamping press after the skew of calculating band material is to the torque offset of mold center, and its value is a curve with changes stroke, shown among Fig. 7 16, checks above-mentioned curve whether to exceed permission torque offset scope.
3) the torque offset value is done repeatedly match of monobasic with the curve of changes stroke, obtain the functional relation fe (s) of torque offset value and stroke, and find the solution the integrated value of fe (s), shown in dash area among Fig. 7 17 variable s (stroke).
4) judge that whether above-mentioned integrated value is zero, if, then the 2nd) band material off-set value in the step is optimum off-set value; If not, then return the 2nd) step, as optimization method, on feasible direction, search for optimum off-set value with " feasible direction method " in the constrained optimization method again.Feasible direction method is a common method of finding the solution nonlinear programming problem, its example strategy is from feasible point, search for along feasible direction, obtain the new feasible point that target function value is descended, the key step of this algorithm is to select the direction of search and definite step-length along this direction.
Claims (1)
1. progressive die belt designing system of optimizing based on the Center of Pressure, it is characterized in that: form by stamping press optimal design module (1), band material sample layout optimizing design module (2) and band material skew optimal design module (3), band material sample layout optimizing design module (2) connects the output of stamping press optimal design module (1), the output of band material skew optimal design module (3) connecting band material sample layout optimizing design module (2); Stamping press optimal design module (1) is determined punch punching press component and mould stamping press; Band material sample layout optimizing design module (2) is found the solution the Center of Pressure off-set value of different layout project and the function of stroke, and according to above-mentioned function the integral mean value of stroke is passed judgment on out optimum layout project; Band material skew optimal design module (3) is found the solution the torque offset value of mould and the function of stroke, and the optimum band material off-set value when determining that above-mentioned function is zero to the stroke integration; Wherein:
Described stamping press optimal design module (1) determines that the method that punch punching press component and mould stamping press are adopted is: the method for using single station multiple operation numerical simulation and multistation list operation numerical simulation to combine, determine the punch punching press component and the mould stamping press that change with the slide block punching stroke; And under the situation of considering above-mentioned punch punching press component, mould stamping press and pressing machine permission stamping press, determine the precedence of the initial punching press of each punch;
Described band material sample layout optimizing design module (2) is found the solution the Center of Pressure off-set value of different layout project and the function of stroke, and according to above-mentioned function the integral mean value of stroke is passed judgment on out the optimum method that layout project adopted and be: each feasible layout project is found the solution Center of Pressure off-set value with changes stroke, and to above-mentioned Center of Pressure off-set value through monobasic repeatedly match draw the function of Center of Pressure off-set value and stroke, and solve the integral mean value of above-mentioned function to stroke, what determine integral mean value minimum in all layout project with this is optimum stock layout;
Described band material skew optimal design module (3) is found the solution the torque offset value of mould and the function of stroke, and the method that the optimum band material off-set value when determining that above-mentioned function is zero to the stroke integration is adopted is: numerical simulation method and torque balance principle combine, calculate torque offset value with the mould of changes stroke, and to above-mentioned torque offset value through monobasic repeatedly match draw the function of torque offset value and stroke, application constraint optimization method and infinitesimal analysis principle, the torque offset value when calculating the above-mentioned function of sening as an envoy to the integrated value of stroke being zero is optimum band material off-set value.
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| CN103896129A (en) * | 2012-12-25 | 2014-07-02 | 江南嘉捷电梯股份有限公司 | Guide rail connecting plate used for elevator and machining technology |
| JP6262631B2 (en) | 2013-11-07 | 2018-01-17 | 株式会社三井ハイテック | LAMINATED CORE MANUFACTURING METHOD AND PUNCHING DIE DEVICE |
| CN104441726B (en) * | 2014-11-17 | 2016-01-06 | 一重集团大连设计研究院有限公司 | A kind of Computer Aided Design for punching machine design and optimization method |
| CN107111661A (en) * | 2015-04-10 | 2017-08-29 | 常石造船株式会社 | Nesting, patterning device and stock layout program |
| CN112580244A (en) * | 2020-12-28 | 2021-03-30 | 天津市津兆机电开发有限公司 | CAE technology-based less-waste sample discharge method for progressive die of tensile piece |
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| CN2879152Y (en) * | 2006-03-31 | 2007-03-14 | 山东建筑大学 | Measuring device for mould punching force and its center |
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| CN2879152Y (en) * | 2006-03-31 | 2007-03-14 | 山东建筑大学 | Measuring device for mould punching force and its center |
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