CN105170795A - Calculation method of variable blank holder force, facilitating formation, and drawing die using calculation method - Google Patents
Calculation method of variable blank holder force, facilitating formation, and drawing die using calculation method Download PDFInfo
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Abstract
The invention relates to a calculation method of variable blank holder force, facilitating formation. The calculation method comprises the following steps: step 1, establishing an initial drawing addendum surface of a part; step 2, performing finite-element stamping emulation analysis on the part; step 3, determining a wrinkling area and a cracking area according to emulation results; step 4, as for the wrinkling area W, moving a blank holding ring (2) of the wrinkling area W in the +Z direction by an adjustment amount delta, and as for the cracking area C, moving a blank holding ring (2) of the cracking area C in the -Z direction by an adjustment amount delta'; and step 5, adopting profiles of the adjusted holding rings (2), and performing finite-element stamping emulation analysis again till obtaining an ideal forming result. According to the calculation method disclosed by the invention, gaskets of different thickness specifications are made, so that the regulation of blank holder force is graded, namely the blank holder force can be greatly or slightly adjusted. A blank holder force adjusting mechanism using the calculation method has the advantages of being simple in structure, low in manufacturing difficulty, convenient in mounting operation, low in processing cost, good in adjusting effect, and wide in range of popularization and use.
Description
Technical field
The present invention relates to Stamping Die Technology, particularly relate to a kind of be beneficial to the punching press drawing die pressure variable edge force of shaping computational methods and a kind ofly realize the adjustable drawing die in pressure-pad-force local.
Background technology
Sheet stamping is the manufacturing process realizing body of a motor car overwhelming majority part, and drawing operation is one of maximum, most important operation of difficulty in stamping procedure, particularly for the sheet metal part of moulding complexity, once the part quality after drawing meets the demands, the part quality of rear operation is protected substantially.
Tradition drawing die structure is made up of die, punch, blank holder three main bodies parts.By the inflow velocity of the clamping force between blank holder and die and kiss gating-feeder material, if the region material that drawing depth can be made large flows into fast, the region material that drawing depth is little flows into slow, and control material inflow velocity preferably, then the formability of part more easily meets the demands.The numerical value of conventional method determination pressure-pad-force calculates gained by empirical equation, then adjust through actual debugging mould; In addition, adopt traditional drawing die structure, clamping force between blank holder and die is applied by the push rod of board, push rod power is finally applied to even distributed force binder surface converting face to, namely pressure-pad-force is waited, so just be unfavorable for the adjustment realizing local pressure-pad-force, be difficult to control each region material and meet desirable inflow velocity, thus the formability of part cannot be ensured.
This needs a kind of new calculation of blank-holder force method, by this new computational methods, can provide pressure-pad-force numerical value accurately needed for each region when the formability meeting part requires.And need a kind of new drawing die structure, realize each region pressure-pad-force numerical value and apply according to required.
There is complex structure in the drawing die that current existing pressure-pad-force is adjustable, installation is inconvenient, cost is high, is unfavorable for defects such as promoting the use of.Therefore, need the drawing die developing a kind of new structure badly, this drawing die should have the feature that structure is simple, manufacture difficulty is little, it is easy to operate to install, processing cost is low, regulating effect good, can promote the use of on a large scale.Meanwhile, this drawing die structure demand fulfillment following functions: 1) need material to flow into fast region, reduces pressure-pad-force; Need material to flow into slow region, increase pressure-pad-force; 2) the adjustment graduation of pressure-pad-force regulates, i.e. large the or fine setting of degree of amplitude modulation.Make the pressure-pad-force of regional area realize controllable adjustment, thus control material inflow, solve draw forming problem.
Summary of the invention
The present invention includes a kind of be beneficial to shaping pressure variable edge force computational methods and realize the adjustable drawing die in pressure-pad-force local, be applicable to the drawing die structure of the various sheet metal part of automobile, be particularly useful for the change of part die parting line sharply, the drawing die design of local drawing depth change part sharply, these pressure variable edge force computational methods can calculate pressure-pad-force numerical value accurately needed for each region when the formability meeting part requires, the drawing die of this structure can quick adjustment local pressure-pad-force, realize each region pressure-pad-force numerical value to apply according to required, control each region material inflow velocity, thus improve the formability of part.
Technical scheme of the present invention is to provide a kind of pressure variable edge force computational methods being beneficial to formability, and it specifically comprises the steps:
Step 1, set up the initial drawing work of part and supplement face;
Step 2, punching press Finite Element Simulation Analysis is carried out to part;
Step 3, when simulation result display part exist wrinkling, cracking, excessive thinning forming defects time, manual adjustment simulation parameter is optimized, if still there is the forming defects that local is wrinkling or ftracture after optimization, then the blank holder that there is Problems in forming areas adjacent is divided into fritter, corrugated regions called after W, fracture area called after C;
Step 4, for corrugated regions W, past for the blank holder of corrugated regions W+Z-direction is moved adjustment amount δ, corrugated regions W blank holder and die gap are adjusted to t-δ, and gap is reduced and flowed into too fast to realize limit feature plate, alleviates wrinkling; Wherein, t is part sheet thickness;
For fracture area C, past for the blank holder of fracture area C-Z-direction is moved adjustment amount δ ', fracture area C blank holder and die gap are adjusted to t+ δ ', and gap increases to enter to realize accelerating part plate stream, alleviates cracking;
The profile of the blank holder after step 5, employing adjustment, carries out punching press Finite Element Simulation Analysis, again until obtain ideal forming result.
Beneficial effect of the present invention: the computational methods being the pressure variable edge force being beneficial to formability and obtaining of the present invention, mainly by dividing shaping problem area, the technique profile in adjustment binder surface region, carry out finite element stamping simulation iteration to be again optimized, finally draw the more excellent pressure-pad-force numerical value in each region.And realize the pressure-pad-force local adjustable function at drawing die by pressure-pad-force adjusting device.
Clamping force between general drawing die blank holder and die is applied by the push rod of board, push rod power is finally applied to even distributed force binder surface converting face to, namely pressure-pad-force is waited, so just be unfavorable for the adjustment realizing local pressure-pad-force, this drawing die structure installs pressure-pad-force adjusting device mainly through local on blank holder, by increasing or deleting that the mode of pad regulates the gap between blank holder and die, reach the size from clamping force between blank holder and die changing plate and be subject to, thus realize the desirable material inflow velocity in each region, improve the formability of part; Meanwhile, by formulating the pad of different-thickness specification, the adjustment of pressure-pad-force classify, namely degree of amplitude modulation is large or finely tune.And this pressure-pad-force governor motion has that structure is simple, manufacture difficulty is little, it is easy to operate to install, processing cost is low, regulating effect good, the advantage that can promote the use of on a large scale.
Accompanying drawing explanation
Fig. 1 is the drawing work profile of certain automobile component;
Fig. 2 is the drawing FEM model of certain automobile component;
Fig. 3 is the blank holder piecemeal schematic diagram of certain automobile component;
Fig. 4 is A-A sectional schematic diagram after the blank holder piecemeal of certain automobile component;
Fig. 5 is pressure variable edge force calculation flow chart;
Fig. 6 is the drawing die structure of certain automobile component;
Fig. 7 is the drawing die structure with the adjustable pressure-pad-force function in local;
Fig. 8 is the operation principle profile B-B of pressure-pad-force adjusting device;
Fig. 9 is the structural profile enlarged drawing of pressure-pad-force adjusting device.
Wherein: 1-die, 2-blank holder, 3-punch, 4-punch die parting line, 5-blank holder die parting line, 6-pressure variable edge force region, 7-pressure-pad-force adjusting device, 8-mounting plate, 9-first regulates pad, 10-second to regulate pad, 11-the 3rd to regulate pad;
Detailed description of the invention
Below with reference to accompanying drawing 1-9, technical scheme of the present invention is described in detail.
As shown in Figure 5, the invention provides a kind of pressure variable edge force computational methods being beneficial to formability, it specifically comprises the steps:
Step 1, set up the initial drawing work of part and supplement face;
As shown in Figure 1, drawing face is also called binder surface, produces distortion to prevent blank.In numerous parts, such as bonnet, its drawing face is process complementary surface entirely.In Drawing die design process, the first step is for its drawing work reasonable in design supplements face, mainly includes drawing face and prunes the design in face, and in automobile panel drawing and moulding technique, the design that drawing work supplements face is the key of whole technical process.
Step 2, punching press Finite Element Simulation Analysis is carried out to part;
Wherein, die 1 is the sheet thickness t of part with the gap of punch 3, die 1 and blank holder 2, and the geometry profile of three large body of tool dies 1, punch 3, blank holder 2 is carried out stress and strain model;
As shown in Figure 2; Carry out stamping simulation optimum configurations again, as plate size, coefficient of friction, pressure-pad-force etc., conveniently finite element stimulation, carries out the emulation of punching press result.
Step 3, foundation part punching FEM Numerical Simulation, when part exists wrinkling, cracking, excessive thinning forming defects, manually simulation parameter is optimized, if still there is the forming defects that local is wrinkling or ftracture after optimization, then the blank holder that there is Problems in forming areas adjacent is divided into fritter, corrugated regions called after W (W1, W2, W3 ...), fracture area called after C (C1, C2, C3 ...), as shown in Figure 3.
Step 4, for corrugated regions W, past for the blank holder 2 of corrugated regions W+Z-direction is moved adjustment amount δ (δ 1, δ 2, δ 3 ...), corrugated regions W blank holder and die gap are adjusted to t-δ, and gap minimizing enters too fast to realize confinement plate stream, alleviates wrinkling;
For fracture area C, past for the blank holder of fracture area C-Z-direction is moved adjustment amount δ ' (δ 1 ', δ 2 ', δ 3 ' ...), fracture area C blank holder and die gap are adjusted to t+ δ ', and gap increases to enter to realize accelerator card stream, alleviate cracking.
Wherein: XY plane is parallel to die horizontal plane ,+Z-direction is pointed to and is perpendicular to XY plane and points to die direction.
Adjustment amount δ is change, and according to wrinkling and serious cracking degree, its numerical value change scope is (0.05-0.2) t.As shown in Figure 4, dotted line is the profile after adjustment to blank holder profile adjustment situation.
Blank holder profile after step 5, employing adjustment, carries out punching press Finite Element Simulation Analysis, again until obtain preferably forming results.
Wherein, regional adjustment amount δ as the later stage drawing die design foundation.
In addition, as shown in Figure 6, in prior art, a kind of drawing die structure of auto parts, its convex mould die parting line 4, blank holder die parting line 5, pressure variable edge force region 6.
For pressure variable edge force region 6, namely in drawing process, the most easily there is the region of Problems in forming.When drawing depth is dark, easily there is problem of Cracking; When drawing depth is shallow, easily there is seriously wrinkling, even folded material problem.This forming defects needs to be improved by the material inflow velocity of control area, namely by regulating local pressure-pad-force.
In order to solve the drawing die structure Problems existing shown in Fig. 6, as Figure 7-9, present invention also offers the drawing die that a kind of pressure-pad-force local is adjustable, it comprises: punch 3, die 1, blank holder 2, pressure-pad-force adjusting device 7; Pressure-pad-force adjusting device 7 comprises mounting plate 8, and first regulates pad 9, second to regulate pad 10, the 3rd to regulate pad 11, pin and nut; Pressure-pad-force adjusting device 7 is located by pin, is fixed on blank holder 2 by nut.Pressure-pad-force adjusting device 7 setting position is positioned at pressure changeable edge regions;
The boundary shape that pressure-pad-force adjusting device 7 gets close to punch side is consistent with die die parting line, and all the other sides keep straight flange, is beneficial to processing and assembling.
In figure in 9, size a is die and blank holder matched moulds gap, and b is that regional area is by the die after the adjustment of pressure-pad-force adjusting device and blank holder gap.
Binder surface form trait in region is consistent therewith for the upper surface of the mounting plate 8 of pressure-pad-force adjusting device 7, and lower surface keeps vertical with Z-direction and pressing direction, is beneficial to following process and assembling.Increase by local the gap that pad realizes reducing die and blank holder, namely reach b<a, make the flanging in other regions relative, this region tighter, pressure-pad-force increases, and it is more difficult that material flows into; Delete that pad realizes increasing the gap of die and blank holder by local, namely reach b>a, make this region more loose relative to the flanging in other regions, pressure-pad-force reduces, and material flows into easier.
First regulates pad 9, second to regulate pad 10, the 3rd to regulate pad 11 ... can have multi-thickness specification, as larger in needs adjustment amount, can formulate every block thickness is 0.5mm; As needs fine setting, can formulate every block thickness is that this device of 0.05mm. is highly suitable for scene and debugs, and flexible carrying out increases or delete pad, to realize the adjustment of local pressure-pad-force.
Although disclose in detail the present invention with reference to accompanying drawing, it should be understood that these descriptions are only exemplary, be not used for limiting application of the present invention.Protection scope of the present invention by appended claims, and can be included in when not departing from scope and spirit for inventing various modification, remodeling and the equivalents done.
Claims (4)
1. be beneficial to pressure variable edge force computational methods for formability, it specifically comprises the steps:
Step 1, set up the initial drawing work of part and supplement face;
Step 2, punching press Finite Element Simulation Analysis is carried out to part;
Step 3, when simulation result display part exist wrinkling, cracking, excessive thinning forming defects time, manual adjustment simulation parameter is optimized, if still there is the forming defects that local is wrinkling or ftracture after optimization, then the blank holder that there is Problems in forming areas adjacent is divided into fritter, corrugated regions called after W, fracture area called after C;
Step 4, for corrugated regions W, past for the blank holder (2) of corrugated regions W+Z-direction is moved adjustment amount δ, corrugated regions W blank holder (2) and die (1) gap are adjusted to t-δ, and gap is reduced to realize the inflow of limit feature plate too fast, alleviates wrinkling; Wherein, t is part sheet thickness;
For fracture area C, past for the blank holder (2) of fracture area C-Z-direction is moved adjustment amount δ ', fracture area C blank holder (2) and die (1) gap are adjusted to t+ δ ', and gap increases to enter to realize accelerating part plate stream, alleviates cracking;
The profile of the blank holder (2) after step 5, employing adjustment, carries out punching press Finite Element Simulation Analysis, again until obtain ideal forming result.
2. the drawing die utilizing the pressure-pad-force of pressure variable edge force computational methods described in claim 1 local adjustable, it is characterized in that: described drawing die comprises punch (3), die (1), blank holder (2), pressure-pad-force adjusting device (7); Pressure-pad-force adjusting device (7) is located by pin, is fixed on blank holder (2) by nut; Pressure-pad-force adjusting device (7) setting position is positioned at pressure changeable edge regions;
Pressure-pad-force adjusting device (7) comprises mounting plate (8), and first regulates pad (9), second to regulate pad (10), the 3rd to regulate pad (11), pin and nut; First regulates pad (9), second to regulate pad (10), the 3rd to regulate pad (11) to be fixed on the below of mounting plate (8) by pin and nut;
3. the drawing die that pressure-pad-force local according to claim 2 is adjustable, it is characterized in that: binder surface form trait in region is consistent therewith for the upper surface of the mounting plate (8) of pressure-pad-force adjusting device (7), lower surface keeps vertical with Z-direction and pressing direction
4. the drawing die that pressure-pad-force local according to claim 2 is adjustable, is characterized in that: first regulates pad (9), second to regulate pad (10), the 3rd to regulate pad (11) to have different thickness specifications.
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Cited By (9)
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| CN107330222A (en) * | 2017-07-21 | 2017-11-07 | 吴锦 | A kind of mould blank holder method for designing profile |
| CN107824713A (en) * | 2017-11-16 | 2018-03-23 | 中国航发沈阳黎明航空发动机有限责任公司 | A kind of drawing process that asymmetric pressure-pad-force is eliminated suitable for deep parabola drip molding |
| CN109108168A (en) * | 2018-10-30 | 2019-01-01 | 上汽大众汽车有限公司 | The calculation method in stamping die molding gap |
| CN109570358A (en) * | 2018-12-18 | 2019-04-05 | 安徽江淮汽车集团股份有限公司 | With the mold for going wrinkle function |
| CN110293167A (en) * | 2019-06-15 | 2019-10-01 | 柳州职业技术学院 | SUV automotive back external door panel drawing work face formative method |
| CN111203485A (en) * | 2020-02-28 | 2020-05-29 | 深圳新顿科技有限公司 | High-strength aluminum alloy hot forming drawing feeding control method, blank holder and die |
| CN114570817A (en) * | 2022-02-22 | 2022-06-03 | 中国航空制造技术研究院 | Thin-wall array bulge structure forming tool and forming method |
| CN114770048A (en) * | 2022-05-12 | 2022-07-22 | 四川成飞集成吉文汽车零部件有限公司 | One-time drawing thermal forming method for large-scale alloy aluminum plate |
| CN115071200A (en) * | 2022-08-24 | 2022-09-20 | 深圳市信润富联数字科技有限公司 | Stamping process and die design method, device, equipment and readable storage medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109570358A (en) * | 2018-12-18 | 2019-04-05 | 安徽江淮汽车集团股份有限公司 | With the mold for going wrinkle function |
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| CN111203485A (en) * | 2020-02-28 | 2020-05-29 | 深圳新顿科技有限公司 | High-strength aluminum alloy hot forming drawing feeding control method, blank holder and die |
| CN114570817A (en) * | 2022-02-22 | 2022-06-03 | 中国航空制造技术研究院 | Thin-wall array bulge structure forming tool and forming method |
| CN114770048A (en) * | 2022-05-12 | 2022-07-22 | 四川成飞集成吉文汽车零部件有限公司 | One-time drawing thermal forming method for large-scale alloy aluminum plate |
| CN115071200A (en) * | 2022-08-24 | 2022-09-20 | 深圳市信润富联数字科技有限公司 | Stamping process and die design method, device, equipment and readable storage medium |
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Application publication date: 20151223 Assignee: HUNAN UNIVERSITY AISHENG AUTO TECHNOLOGY DEVELOPMENT Co.,Ltd. Assignor: HUNAN University Contract record no.: X2020980004845 Denomination of invention: Calculation method of variable blank holder force for forming and drawing die using this method Granted publication date: 20170606 License type: Common License Record date: 20200811 |
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